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Table Of Contents

SARA-G3 and SARA-U2 series

GSM/GPRS and GSM/EGPRS/HSPA

Cellular Modules

System Integration Manual

Abstract

This document describes the features and the system integration of

the SARA-G3 series GSM/GPRS cellular modules and the SARA-U2

GSM/EGPRS/HSPA cellular modules.

These modules are complete and cost efficient solutions offering

voice and/or data communication over diverse cellular radio access

technologies in the same compact SARA form factor: the SARA-G3

series support up to 4-band GSM/GPRS while the SARA-U2 series

support 2-band high-speed HSPA and up to 2-band GSM/EGPRS.

www.u-blox.com

UBX-13000995 - R08

Summary of content (188 pages)

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SARA-G3 and SARA-U2 series GSM/GPRS and GSM/EGPRS/HSPA Cellular Modules System Integration Manual Abstract This document describes the features and the system integration of the SARA-G3 series GSM/GPRS cellular modules and the SARA-U2 GSM/EGPRS/HSPA cellular modules.
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SARA-G3 and SARA-U2 series - System Integration Manual Document Information Title SARA-G3 and SARA-U2 series Subtitle GSM/GPRS and GSM/EGPRS/HSPA Cellular Modules Document type System Integration Manual Document number UBX-13000995 Revision, date R08 Document status Objective Specification 29-Apr-2014 Document status explanation Objective Specification Document contains target values. Revised and supplementary data will be published later.
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SARA-G3 and SARA-U2 series - System Integration Manual Preface u-blox Technical Documentation As part of our commitment to customer support, u-blox maintains an extensive volume of technical documentation for our products. In addition to our product-specific technical data sheets, the following manuals are available to assist u-blox customers in product design and development.  AT Commands Manual: This document provides the description of the AT commands supported by the u-blox cellular modules.
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SARA-G3 and SARA-U2 series - System Integration Manual Contents Preface ................................................................................................................................ 3 Contents.............................................................................................................................. 4 1 System description ....................................................................................................... 8 1.1 1.2 Overview .........................
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SARA-G3 and SARA-U2 series - System Integration Manual 2 1.13.4 1.13.5 TCP/IP and UDP/IP ....................................................................................................................... 70 FTP .............................................................................................................................................. 70 1.13.6 HTTP .....................................................................................................................................
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SARA-G3 and SARA-U2 series - System Integration Manual 2.13.2 2.13.3 2.14 ESD immunity test of u-blox SARA-G3 and SARA-U2 reference designs..................................... 143 ESD application circuits .............................................................................................................. 144 SARA-G350 ATEX integration in explosive atmospheres applications ............................................ 146 2.14.1 2.14.2 General guidelines ........................................
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SARA-G3 and SARA-U2 series - System Integration Manual 5.2.1 5.2.2 “Go/No go” tests for integrated devices .................................................................................... 165 Functional tests providing RF operation ..................................................................................... 165 Appendix ........................................................................................................................ 168 A Migration between LISA and SARA-G3 modules ....
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SARA-G3 and SARA-U2 series - System Integration Manual 1 System description 1.
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SARA-G3 and SARA-U2 series - System Integration Manual Table 2 reports a summary of 2G cellular characteristics of SARA-G3 and SARA-U2 series modules.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.2 Architecture Figure 1 summarizes the architecture of SARA-G300 and SARA-G310 modules, while Figure 2 summarizes the architecture of SARA-G340 and SARA-G350 modules, describing the internal blocks of the modules, consisting of the RF, Baseband and Power Management main sections, and the available interfaces.
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SARA-G3 and SARA-U2 series - System Integration Manual Figure 3 summarizes the architecture of SARA-U260 and SARA-U270 modules, while Figure 4 summarizes the architecture of SARA-U280 and SARA-U290 modules, describing the internal blocks of the modules, consisting of the RF, Baseband and Power Management main sections, and the available interfaces. 26 MHz 32.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.2.1 Internal blocks SARA-G3 and SARA-U2 series modules internally consist of the RF, Baseband and Power Management sections here described with more details than the simplified block diagrams of Figure 1, Figure 2, Figure 3 and Figure 4.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.3 Pin-out Table 4 lists the pin-out of the SARA-G3 and SARA-U2 series modules, with pins grouped by function. Function Pin Name Module Pin No Power VCC All GND System Antenna Description Remarks 51, 52, 53 I Module supply input VCC pins are internally connected each other. VCC supply circuit affects the RF performance and compliance of the device integrating the module with applicable required certification schemes. See section 1.5.
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SARA-G3 and SARA-U2 series - System Integration Manual Function Pin Name Module Pin No I/O Description Remarks SIM VSIM All 41 O SIM supply output VSIM = 1.80 V typ. or 2.85 V typ. automatically generated according to the connected SIM type. See section 1.8 for functional description. See section 2.5 for external circuit design-in. SIM_IO All 39 I/O SIM data Data input/output for 1.8 V / 3 V SIM Internal 4.7 k pull-up to VSIM. See section 1.8 for functional description. See section 2.
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SARA-G3 and SARA-U2 series - System Integration Manual Function Pin Name Module Pin No I/O Description Remarks Auxiliary UART RXD_AUX SARA-G3 28 O Auxiliary UART data output 1.8 V output, Circuit 104 (RXD) in ITU-T V.24, for FW upgrade via EasyFlash tool and diagnostic. Access by external test-point is recommended. See section 1.9.2 for functional description. See section 2.6.2 for external circuit design-in. TXD_AUX SARA-G3 29 I Auxiliary UART data input 1.
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SARA-G3 and SARA-U2 series - System Integration Manual Function Pin Name Module Pin No I/O Description Remarks Analog Audio MIC_BIAS SARA-G340 SARA-G350 46 O Microphone supply output Supply output (2.2 V typ) for external microphone. See section 1.10.1 for functional description. See section 2.7.1 for external circuit design-in. MIC_GND SARA-G340 SARA-G350 47 I Microphone analog reference Local ground for the external microphone (reference for the analog audio uplink path).
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SARA-G3 and SARA-U2 series - System Integration Manual Function Pin Name Module Pin No I/O Description Remarks GPIO GPIO1 SARA-G340 SARA-G350 SARA-U2 16 I/O GPIO 1.8 V GPIO by default configured as pin disabled. See section 1.11 for functional description. See section 2.8 for external circuit design-in. GPIO2 SARA-G340 SARA-G350 SARA-U2 23 I/O GPIO 1.8 V GPIO by default configured to provide the custom GNSS supply enable function. See section 1.11 for functional description.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.4 Operating modes SARA-G3 modules have several operating modes. The operating modes defined in Table 5 and described in detail in Table 6 provide general guidelines for operation. General Status Operating Mode Definition Power-down Not-Powered Mode Power-Off Mode VCC supply not present or below operating range: module is switched off. VCC supply within operating range and module is switched off.
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SARA-G3 and SARA-U2 series - System Integration Manual Operating Mode Description Transition between operating modes Active The module is ready to communicate with an external device by means of the application interfaces unless power saving configuration is enabled by the AT+UPSV command (see sections 1.5.1.4, 1.9.1.4 and to the u-blox AT Commands Manual [3]). When the module is switched on by an appropriate power-on event (see 2.3.1), the module enters active-mode from not-powered or power-off mode.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.5 Supply interfaces 1.5.1 Module supply input (VCC) The modules must be supplied via the three VCC pins that represent the module power supply input.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.5.1.2 VCC current consumption in 2G connected-mode When a GSM call is established, the VCC consumption is determined by the current consumption profile typical of the GSM transmitting and receiving bursts. The current consumption peak during a transmission slot is strictly dependent on the transmitted power, which is regulated by the network.
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SARA-G3 and SARA-U2 series - System Integration Manual Figure 7 illustrates VCC voltage profile versus time during a GSM call, according to the related VCC current consumption profile described in Figure 6. Voltage overshoot 3.8 V (typ) drop ripple RX slot unused unused slot slot TX slot undershoot unused unused slot slot MON slot unused slot RX slot unused unused slot slot GSM frame 4.615 ms (1 frame = 8 slots) TX slot unused unused slot slot MON slot unused slot Time GSM frame 4.
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SARA-G3 and SARA-U2 series - System Integration Manual Current [A] 1600 mA 1.5 Peak current depends on TX power 1.0 0.5 200mA 60-120mA 0.0 60-120mA 10-40mA RX slot unused slot TX slot TX slot TX slot TX slot GSM frame 4.615 ms (1 frame = 8 slots) MON slot unused slot RX slot unused slot TX slot TX slot TX slot TX slot MON slot unused slot Time [ms] GSM frame 4.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.5.1.3 VCC current consumption in 3G connected mode During a 3G connection, the SARA-U2 modules can transmit and receive continuously due to the Frequency Division Duplex (FDD) mode of operation with the Wideband Code Division Multiple Access (WCDMA). The current consumption depends again on output RF power, which is always regulated by network commands.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.5.1.4 VCC current consumption in cyclic idle/active-mode (power saving enabled) The power saving configuration is by default disabled, but it can be enabled using the appropriate AT command (see u-blox AT Commands Manual [3], AT+UPSV command). When power saving is enabled, the module automatically enters low power idle-mode whenever possible, reducing current consumption.
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SARA-G3 and SARA-U2 series - System Integration Manual Figure 12 roughly describes the current consumption profile of SARA-G300 and SARA-G310 modules when the EXT32K input pin is fed by the 32K_OUT output pin provided by these modules, when power saving is enabled. The module is registered with the network, automatically enters the low power idle-mode and periodically wakes up to active-mode to monitor the paging channel for paging block reception.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.5.1.5 VCC current consumption in fixed active-mode (power saving disabled) Power saving configuration is by default disabled, or it can be disabled using the appropriate AT command (see u-blox AT Commands Manual [3], AT+UPSV command). When power saving is disabled, the module does not automatically enter idle-mode whenever possible: the module remains in active-mode.
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SARA-G3 and SARA-U2 series - System Integration Manual Figure 14 roughly describes the current consumption profile of SARA-G340, SARA-G350, SARA-U2 series or the current consumption profile of SARA-G300 / SARA-G310 modules when their EXT32K input is not fed by a signal (left unconnected), when power saving is disabled: the module is registered with the network, activemode is maintained, and the receiver and the DSP are periodically activated to monitor the paging channel for paging block reception.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.5.2 RTC supply input/output (V_BCKP) The V_BCKP pin of SARA-G3 and SARA-U2 series modules connects the supply for the Real Time Clock (RTC) and Power-On internal logic. This supply domain is internally generated by a linear LDO regulator integrated in the Power Management Unit, as described in Figure 15.
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SARA-G3 and SARA-U2 series - System Integration Manual The RTC has very low power consumption, but is highly temperature dependent. For example at 25 °C, with the V_BCKP voltage equal to the typical output value, the current consumption is approximately 2 µA (see the “Input characteristics of Supply/Power pins” table in the SARA-G3 series Data Sheet [1] and SARA-U2 series Data Sheet [2] for the detailed specification), whereas at 70 °C and an equal voltage the current consumption increases to 5-10 µA.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.6 System function interfaces 1.6.1 Module power-on 1.6.1.1 Switch-on events Table 9 summarizes the possible switch-on events for the SARA-G3 and SARA-U2 series modules. SARA-G3 SARA-U2 From Not-Powered Mode Applying valid VCC supply voltage (i.e. VCC rise edge), ramping from 2.5 V to 3.2 V within 4 ms Applying valid VCC supply voltage (i.e. VCC rise edge), ramping from 2.5 V to 3.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.6.1.2 Switch-on sequence from not-powered mode Figure 19 shows the modules power-on sequence from the not-powered mode, describing the following phases:  The external supply is applied to the VCC module supply inputs, representing the start-up event.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.6.1.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.6.2 Module power-off 1.6.2.1 Switch-off events The SARA-G3 and SARA-U2 series modules can be properly switched off by:  AT+CPWROFF command (more details in u-blox AT Commands Manual [3]).
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SARA-G3 and SARA-U2 series - System Integration Manual 1.6.2.2 Switch-off sequence by AT+CPWROFF Figure 20 describes the SARA-G3 and SARA-U2 series modules power-off sequence, properly started sending the AT+CPWROFF command, allowing storage of current parameter settings in the module’s non-volatile memory and a proper network detach, with the following phases:  When the +CPWROFF AT command is sent, the module starts the switch-off routine.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.6.3 Module reset SARA-G3 and SARA-U2 series modules can be properly reset (rebooted) by:  AT+CFUN command (see the u-blox AT Commands Manual [3] for more details). This command causes an “internal” or “software” reset of the module, which is an asynchronous reset of the module baseband processor.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.6.4 External 32 kHz signal input (EXT32K) The EXT32K pin is not available on SARA-G340, SARA-G350 and SARA-U2 series modules. The EXT32K pin of SARA-G300 / SARA-G310 modules is an input pin that must be fed by a proper 32 kHz signal to make available the reference clock for the Real Time Clock (RTC) timing, used by the module processor when in the low power idle-mode.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.7 Antenna interface 1.7.1 Antenna RF interface (ANT) The ANT pin of SARA-G3 and SARA-U2 series modules represents the RF input/output for transmission and reception of the 2G or 3G RF signals. The ANT pin has a nominal characteristic impedance of 50  and must be connected to the antenna through a 50  transmission line to allow proper RF transmission and reception in operating bands. 1.7.1.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.7.2 Antenna detection interface (ANT_DET) Antenna detection interface (ANT_DET) is not supported by SARA-G300 and SARA-G310 modules. The antenna detection is based on ADC measurement. The ANT_DET pin is an Analog to Digital Converter (ADC) provided to sense the antenna presence. The antenna detection function provided by ANT_DET pin is an optional feature that can be implemented if the application requires it.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.9 Serial interfaces SARA-G3 and SARA-U2 series modules provide the following serial communication interfaces:  UART interface: 9-wire unbalanced 1.8 V asynchronous serial interface available for AT commands, data communication, FW upgrades by means of the FOAT feature (see 1.9.1)  Auxiliary UART interface (not supported by SARA-U2 series): 3-wire unbalanced 1.
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SARA-G3 and SARA-U2 series - System Integration Manual The following baud rates can be configured by AT command (see u-blox AT Commands Manual [3], +IPR):  1200 b/s  2400 b/s  4800 b/s  9600 b/s  19200 b/s  38400 b/s  57600 b/s  115200 b/s, default value when the autobauding or the one-shot autobauding are disabled  230400 b/s  460800 b/s  921600 b/s 460800 b/s and 921600 b/s baud rates are not supported by SARA-G3 series modules.
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SARA-G3 and SARA-U2 series - System Integration Manual The module firmware can be updated over the UART interface by means of:  the Firmware upgrade Over AT (FOAT) feature, on all the SARA-G3 and SARA-U2 series modules  the u-blox EasyFlash tool, on SARA-U2 series modules only For more details on FW upgrade procedures see section 1.13 and Firmware update application note [25]. 1.9.1.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.9.1.3 UART signal behavior At the module switch-on, before the UART interface initialization (as described in the power-on sequence 10 reported in Figure 18 or Figure 19), each pin is first tri-stated and then is set to its related internal reset state . At the end of the boot sequence, the UART interface is initialized, the module is by default in active-mode, and the UART interface is enabled as AT commands interface.
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SARA-G3 and SARA-U2 series - System Integration Manual RTS signal behavior The hardware flow control input (RTS line) is set by default to the OFF state (high level) at UART initialization. The module then holds the RTS line in the OFF state if the line is not activated by the DTE: an active pull-up is enabled inside the module on the RTS input. If the HW flow control is enabled, as it is by default, the module monitors the RTS line to detect permission from the DTE to send data to the DTE itself.
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SARA-G3 and SARA-U2 series - System Integration Manual DCD signal behavior If AT&C1 is set, as it is by default, the DCD module output line is set by default to the OFF state (high level) at UART initialization. The module then sets the DCD line according to the carrier detect status: ON if the carrier is detected, OFF otherwise. For voice calls, DCD is set to the ON state when the call is established.
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SARA-G3 and SARA-U2 series - System Integration Manual RI signal behavior The RI module output line is set by default to the OFF state (high level) at UART initialization. Then, during an incoming call, the RI line is switched from the OFF state to the ON state with a 4:1 duty cycle and a 5 s period (ON for 1 s, OFF for 4 s, see Figure 23), until the DTE attached to the module sends the ATA string and the module accepts the incoming data call.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.9.1.4 UART and power-saving The power saving configuration is controlled by the AT+UPSV command (for the complete description, see u-blox AT Commands Manual [3]). When power saving is enabled, the module automatically enters low power idle-mode whenever possible, and otherwise the active-mode is maintained by the module (see section 1.4 for definition and description of module operating modes referred to in this section).
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SARA-G3 and SARA-U2 series - System Integration Manual AT+UPSV HW flow control RTS line DTR line Communication during idle-mode and wake up 3 Enabled (AT&K3) ON ON 3 Enabled (AT&K3) ON OFF Data sent by the DTE is correctly received by the module. Data sent by the module is correctly received by the DTE. Data sent by the DTE is lost by the module. Data sent by the module is correctly received by the DTE.
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SARA-G3 and SARA-U2 series - System Integration Manual The time period between two paging receptions is defined by the current base station (i.e. by the network):  If the module is registered with a 2G network, the paging reception period can vary from ~0.47 s (DRX = 2, i.e. 2 x 51 2G-frames) up to ~2.12 s (DRX = 9, i.e. 9 x 51 2G-frames)  If the module is registered with a 3G network, the paging reception period can vary from 0.64 s (DRX = 6, 6 9 i.e. 2 3G-frames) up to 5.12 s (DRX = 9, i.e.
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SARA-G3 and SARA-U2 series - System Integration Manual AT+UPSV=2: power saving enabled and controlled by the RTS line This configuration can only be enabled with the module hardware flow control disabled by AT&K0 command. The UART interface is immediately disabled after the DTE sets the RTS line to OFF.
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SARA-G3 and SARA-U2 series - System Integration Manual Wake up via data reception The UART wake up via data reception consists of a special configuration of the module TXD input line that causes the system wake-up when a low-to-high transition occurs on the TXD input line. In particular, the UART is enabled and the module switches from the low power idle-mode to active-mode within ~20 ms from the first character received: this is the system “wake up time”.
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SARA-G3 and SARA-U2 series - System Integration Manual Figure 27 shows the case where in addition to the wake-up character further (valid) characters are sent. The wake up character wakes-up the module UART. The other characters must be sent after the “wake up time” of ~20 ms. If this condition is satisfied, the module (DCE) recognizes characters. The module will disable the UART after 2000 GSM frames from the latest data reception. UART DCE UART is enabled for 2000 GSM frames (~9.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.9.1.5 Multiplexer protocol (3GPP 27.010) SARA-G3 and SARA-U2 series modules have a software layer with MUX functionality, the 3GPP TS 27.010 2 Multiplexer Protocol [13], available on the UART physical link. The auxiliary UART, the USB and the DDC (I C) serial interfaces do not support the multiplexer protocol.
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SARA-G3 and SARA-U2 series - System Integration Manual SARA-U2 modules provide by default the following USB profile with the listed set of available USB functions (USB CDCs, Communications Device Classes):  USB1: AT and Data (AT command interface and packet-switched / circuit-switched data communication)  USB2: AT and Data (AT command interface and packet-switched / circuit-switched data communication)  USB3: AT and Data (AT command interface and packet-switched / circuit-switched data communicatio
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SARA-G3 and SARA-U2 series - System Integration Manual If the USB interface of a SARA-U2 module is connected to the host before the module switch on, or if the module is reset with the USB interface connected to the host, the VID and PID are automatically updated runtime, after the USB detection.
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SARA-G3 and SARA-U2 series - System Integration Manual Combining a u-blox cellular module with a u-blox GNSS receiver allows designers to have full access to the positioning receiver directly via the cellular module: it relays control messages to the GNSS receiver via a nd dedicated DDC (I C) interface.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.10 Audio interface SARA-G300 and SARA-G310 modules do not support audio interface.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.10.1.2 Downlink path SARA-G340 / SARA-G350 pins related to the analog audio downlink path are:  SPK_P / SPK_N: Differential analog audio signal output (positive/negative). These two pins are directly connected internally to the differential output of a low power audio amplifier, for which the input is connected internally to the digital processing system by to an integrated digital-to-analog converter.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.10.2 Digital audio interface SARA-G340, SARA-G350 and SARA-U2 modules provide one 1.8 V bidirectional 4-wire (I2S_TXD data output, 2 I2S_RXD data input, I2S_CLK clock, I2S_WA world alignment) I S digital audio interface that can be used for digital audio communication with external digital audio devices as an audio codec.
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SARA-G3 and SARA-U2 series - System Integration Manual 2 1.10.2.1 I S interface – PCM mode 2 Main features of the I S interface in PCM mode (configurable by AT+UI2S command):  I S runs in PCM – short alignment mode  I S word alignment signal is configured by the parameter  I S word alignment is set high for 1 or 2 clock cycles for the synchronization, and then is set low for 16 clock cycles of sample width.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.10.3 Voice-band processing system 1.10.3.1 SARA-G340 / SARA-G350 modules audio processing The voice-band processing on the SARA-G340 / SARA-G350 modules is implemented in the DSP core inside the baseband chipset. The analog audio front-end of the chipset is connected to the digital system through 16 bit ADC converters in the uplink path, and through 16 bit DAC converters in the downlink path.
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SARA-G3 and SARA-U2 series - System Integration Manual Two different sample-based sample rate converters are used: an interpolator, required to convert the sample-based voice-band processing sampling rate of 8 kHz to the analog audio front-end output rate of 47.6 kHz; a decimator, required to convert the circular buffer sampling rate of 47.6 kHz to the I2Sx TX or the uplink path sample rate of 8 kHz.
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SARA-G3 and SARA-U2 series - System Integration Manual SARA-U2 modules audio signal processing algorithms are:  Speech encoding (uplink) and decoding (downlink).
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SARA-G3 and SARA-U2 series - System Integration Manual 1.11 General Purpose Input/Output (GPIO) SARA-G300 and SARA-G310 modules do not support GPIOs.
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SARA-G3 and SARA-U2 series - System Integration Manual  GNSS supply enable: The GPIO2 is by default configured by AT+UGPIOC command to enable or disable the supply of the u-blox GNSS receiver connected to the cellular module. The GPIO1, GPIO3, GPIO4 pins and, on SARA-U2 series only, also the SIM_DET pin, can be configured to provide the “GNSS supply enable” function, alternatively to the default GPIO2 pin, setting the parameter of AT+UGPIOC command to 3.
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SARA-G3 and SARA-U2 series - System Integration Manual  Module status indication: The GPIO1 pin of SARA-U2 modules can be configured to indicate module status (power-off mode, i.e. module switched off, versus idle, active or connected mode, i.e. module switched on), by properly setting the parameter of AT+UGPIOC command to 10. No GPIO pin is by default configured to provide the “Module status indication”.
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SARA-G3 and SARA-U2 series - System Integration Manual  Pin disabled: All the GPIOs can be configured in tri-state with an internal active pull-down enabled, as a not used pin, setting the parameter of +UGPIOC AT command to 255. The “Pin disabled” mode can be provided on more than one pin per time: it is possible to simultaneously set the same mode on another pin (also on all the GPIOs).
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SARA-G3 and SARA-U2 series - System Integration Manual Pin Module Description Remarks 42 SARA-G340 SIM_DET SARA-G350 SARA-U2 series SIM_DET Name SIM detection 34 SARA-U2 series I2S_WA GPIO 35 SARA-U2 series I2S_TXD GPIO 36 SARA-U2 series I2S_CLK GPIO By default, the pin is configured to provide SIM card detection function. The pin cannot be alternatively configured by the +UGPIOC command. By default, the pin is configured to provide SIM card detection function.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.13 System features 1.13.1 Network indication Not supported by SARA-G300 and SARA-G310 modules. The GPIO1, or the GPIO2, GPIO3, GPIO4 and, on SARA-U2 series only, the SIM_DET, alternatively from their default settings, can be configured to indicate network status (i.e. no service, registered home network, registered visitor network, voice or data call enabled), by means of the AT+UGPIOC command. For the detailed description, see section 1.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.13.4 TCP/IP and UDP/IP Not supported by SARA-G300 and SARA-G310 modules. Via the AT commands it is possible to access the embedded TCP/IP and UDP/IP stack functionalities over the Packet Switched data connection. For more details about AT commands see u-blox AT Commands Manual [3]. Direct Link mode for TCP and UDP sockets is supported.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.13.8 SSL Not supported by SARA-G3 modules. SARA-U2 modules support the Transport Layer Security (TLS) / Secure Sockets Layer (SSL) cryptographic protocols to provide security over the FTP and HTTP protocols.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.13.10 Smart temperature management Not supported by SARA-G300 and SARA-G310 modules. Cellular modules – independent of the specific model – always have a well-defined operating temperature range. This range should be respected to guarantee full device functionality and long life span. Nevertheless there are environmental conditions that can affect operating temperature, e.g.
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SARA-G3 and SARA-U2 series - System Integration Manual Figure 31 shows the flow diagram implemented in the SARA-G340 and SARA-G350 modules for the Smart Temperature Supervisor.
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SARA-G3 and SARA-U2 series - System Integration Manual Threshold definitions When the module application operates at extreme temperatures with Smart Temperature Supervisor enabled, the user should note that outside the valid temperature range the device automatically shuts down as described above. The input for the algorithm is always the temperature measured within the cellular module (Ti, internal).
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SARA-G3 and SARA-U2 series - System Integration Manual 1.13.12 Hybrid positioning and CellLocateTM Not supported by SARA-G300 and SARA-G310 versions. Although GNSS is a widespread technology, reliance on the visibility of extremely weak GNSS satellite signals means that positioning is not always possible, particularly in shielded environments such as indoors and enclosed park houses, or when a GNSS jamming signal is present.
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SARA-G3 and SARA-U2 series - System Integration Manual 3. If a new device reports the observation of Cell A CellLocate the area of visibility TM is able to provide the estimated position from 4. The visibility of multiple cells provides increased accuracy based on the intersection of areas of visibility. TM TM CellLocate is implemented using a set of two AT commands that allow configuration of the CellLocate service (AT+ULOCCELL) and requesting position according to the user configuration (AT+ULOC).
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SARA-G3 and SARA-U2 series - System Integration Manual 2 The use of hybrid positioning requires a connection via the DDC (I C) bus between the SARA-G340 / SARA-G350 cellular modules and the u-blox GNSS receiver (see section 2.6.4). See GNSS Implementation Application Note [24] for the complete description of the feature. u-blox is extremely mindful of user privacy. When a position is sent to the CellLocate server u-blox is unable to track the SIM used or the specific device. 1.13.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.13.15 In-Band modem (eCall / ERA-GLONASS) Not supported by SARA-G300 / SARA-G310 / SARA-U260 / SARA-U280 modules. SARA-G340, SARA-G350 and SARA-U2 modules support an In-Band modem solution for the European eCall and the Russian ERA-GLONASS emergency call applications over cellular networks, implemented according to 3GPP TS 26.267 [22], BS EN 16062:2011 [30] and ETSI TS 122 101 [31] specifications.
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SARA-G3 and SARA-U2 series - System Integration Manual SARA-U2 modules, acting as an SAP client, can be connected to an SAP server by a completely wired connection, as shown in Figure 33.
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SARA-G3 and SARA-U2 series - System Integration Manual 1.13.17 Power saving The power saving configuration is by default disabled, but it can be enabled using the AT+UPSV command. When power saving is enabled, the module automatically enters the low power idle-mode whenever possible, reducing current consumption. During low power idle-mode, the module is not ready to communicate with an external device by means of the application interfaces, since it is configured to reduce power consumption.
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SARA-G3 and SARA-U2 series - System Integration Manual 2 Design-in 2.1 Overview For an optimal integration of SARA-G3 and SARA-U2 series modules in the final application board follow the design guidelines stated in this section. Every application circuit must be properly designed to guarantee the correct functionality of the related interface, however a number of points require higher attention during the design of the application device.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.2 Supply interfaces 2.2.1 Module supply (VCC) 2.2.1.1 General guidelines for VCC supply circuit selection and design VCC pins are internally connected, but connect all the available pins to the external supply to minimize the power loss due to series resistance.
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SARA-G3 and SARA-U2 series - System Integration Manual Keep in mind that the use of rechargeable batteries requires the implementation of a suitable charger circuit which is not included in SARA-G3 and SARA-U2 series modules. The charger circuit has to be designed to prevent over-voltage on VCC pins of the module, and it should be selected according to the application requirements: a DC/DC switching charger is the typical choice when the charging source has an high nominal voltage (e.g.
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SARA-G3 and SARA-U2 series - System Integration Manual  PWM mode operation: it is preferable to select regulators with Pulse Width Modulation (PWM) mode. While in connected-mode Pulse Frequency Modulation (PFM) mode and PFM/PWM mode, transitions must be avoided to reduce the noise on the VCC voltage profile.
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SARA-G3 and SARA-U2 series - System Integration Manual Figure 37 and the components listed in Table 17 show an example of a low cost power supply circuit, where the VCC module supply is provided by a step-down switching regulator capable of delivering to VCC pins the specified maximum peak / pulse current, transforming a 12 V supply input.
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SARA-G3 and SARA-U2 series - System Integration Manual  Output voltage slope: the use of the soft start function provided by some voltage regulator should be carefully evaluated, since the VCC pins voltage must ramp from 2.5 V to 3.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.2.1.
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SARA-G3 and SARA-U2 series - System Integration Manual SARA-G3 / SARA-U2 3V8 VCC 51 VCC 52 VCC 53 + C5 C4 C3 C2 C1 GND Figure 39: Suggested schematic and layout design for the VCC bypass capacitors to reduce ripple / noise on VCC voltage profile and to avoid undershoot / overshoot on VCC voltage drops Reference Description Part Number - Manufacturer C1 330 µF Capacitor Tantalum D_SIZE 6.
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SARA-G3 and SARA-U2 series - System Integration Manual the L6924U can also charge from an AC wall adapter as its input voltage range is tolerant up to 12 V: when a current-limited adapter is used, it can operate in quasi-pulse mode, reducing power dissipation.
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SARA-G3 and SARA-U2 series - System Integration Manual A power management IC should meet the following prerequisites to comply with the module VCC requirements summarized in Table 7:  High efficiency internal step down converter, compliant with the performances specified in section 2.2.1.
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SARA-G3 and SARA-U2 series - System Integration Manual Using a battery pack with an internal NTC resistor, the MP2617 can monitor the battery temperature to protect the battery from operating under unsafe thermal conditions.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.2.1.9 Guidelines for VCC supply layout design Good connection of the module VCC pins with DC supply source is required for correct RF performance. Guidelines are summarized in the following list:  All the available VCC pins must be connected to the DC source.  VCC connection must be as wide as possible and as short as possible.  Any series component with Equivalent Series Resistance (ESR) greater than few milliohms must be avoided.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.2.2 RTC supply (V_BCKP) 2.2.2.1 Guidelines for V_BCKP circuit design If RTC timing is required to run for a time interval of T [s] at 25 °C when VCC supply is removed, place a capacitor with a nominal capacitance of C [µF] at the V_BCKP pin. Choose the capacitor using the following formula: C [µF] = (Current_Consumption [µA] x T [s]) / Voltage_Drop [V] = 1.5 x T [s] for SARA-G3 series = 2.
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SARA-G3 and SARA-U2 series - System Integration Manual is disconnected. If VCC is always supplied, then the internal regulator is supplied from the main supply and there is no need for an external component on V_BCKP. Combining a SARA-G3 or a SARA-U2 cellular module with a u-blox GNSS positioning receiver, the positioning receiver VCC supply is controlled by the cellular module by means of the “GNSS supply enable” function provided by the GPIO2 of the cellular module.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.2.3 Interface supply (V_INT) 2.2.3.1 Guidelines for V_INT circuit design The V_INT digital interfaces 1.8 V supply output can be mainly used to:  Pull-up DDC (I C) interface signals (see section 2.6.4 for more details)  Pull-up SIM detection signal (see section 2.5 for more details)  Supply voltage translators to connect digital interfaces of the module to a 3.0 V device (see section 2.6.1)  Supply a 1.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.3 System functions interfaces 2.3.1 Module power-on (PWR_ON) 2.3.1.1 Guidelines for PWR_ON circuit design Connecting the PWR_ON input to a push button that shorts the PWR_ON pin to ground, provide an external pull-up resistor (e.g. 100 kΩ) biased by the V_BCKP supply pin of the module, as described in Figure 44 and Table 23.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.3.1.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.3.2.2 Guidelines for RESET_N layout design The reset circuit (RESET_N) requires careful layout due to the pin function: ensure that the voltage level is well defined during operation and no transient noise is coupled on this line, otherwise the module might detect a spurious reset request. It is recommended to keep the connection line to RESET_N as short as possible. 2.3.
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SARA-G3 and SARA-U2 series - System Integration Manual The two different solutions described in Figure 46 and Figure 47 are alternative and mutually exclusive: only one of the two proposed solutions must be implemented according to the required current consumption figures for the idle-mode (for the detailed characteristics see the SARA-G3 series Data Sheet [1]).
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SARA-G3 and SARA-U2 series - System Integration Manual 2.4 Antenna interface The ANT pin, provided by all the SARA-G3 and SARA-U2 series modules, represents the RF input/output used to transmit and receive the 2G/3G RF cellular signals: the antenna must be connected to this pin. The ANT pin has a nominal characteristic impedance of 50  and must be connected to the antenna through a 50  transmission line to allow transmission and reception of radio frequency (RF) signals in the 2G and 3G operating bands.
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SARA-G3 and SARA-U2 series - System Integration Manual In both cases, selecting an external or an internal antenna, observe these recommendations:  Select an antenna providing optimal return loss (or V.S.W.R.) figure over all the operating frequencies  Select an antenna providing optimal efficiency figure over all the operating frequencies  Select an antenna providing appropriate gain figure (i.e.
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SARA-G3 and SARA-U2 series - System Integration Manual Figure 49 and Figure 50 provide two examples of proper 50  coplanar waveguide designs. The first transmission line can be implemented in case of 4-layer PCB stack-up herein described, the second transmission line can be implemented in case of 2-layer PCB stack-up herein described.
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SARA-G3 and SARA-U2 series - System Integration Manual Additionally to the 50  impedance, the following guidelines are recommended for the transmission line design:  Minimize the transmission line length: the insertion loss should be minimized as much as possible, in the order of a few tenths of a dB  Add GND keep-out (i.e.
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SARA-G3 and SARA-U2 series - System Integration Manual Guidelines for RF termination design The RF termination must provide a characteristic impedance of 50  as well as the RF transmission line up to the RF termination itself, to match the characteristic impedance of the ANT pin of the module. However, real antennas do not have perfect 50  load on all the supported frequency bands.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.4.2 Antenna detection interface (ANT_DET) Antenna detection interface (ANT_DET) is not supported by SARA-G300 and SARA-G310 modules. 2.4.2.1 Guidelines for ANT_DET circuit design Figure 52 and Table 26 describe the recommended schematic and components for the antenna detection circuit to be provided on the application board for the diagnostic circuit that must be provided on the antenna assembly to achieve antenna detection functionality.
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SARA-G3 and SARA-U2 series - System Integration Manual  Additional high pass filter (C3 and L2 in Figure 52) is provided at the ANT pin as ESD immunity improvement for SARA-U2 modules (a series 0  jumper can be mounted for SARA-G340 and SARA-G350 modules instead of the high pass filter, as no further precaution to ESD immunity test is needed).
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SARA-G3 and SARA-U2 series - System Integration Manual 2.4.2.1 Guidelines for ANT_DET layout design Figure 53 describes the recommended layout for the antenna detection circuit to be provided on the application board to achieve antenna detection functionality, implementing the recommended schematic described in the previous Figure 52 and Table 26.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.5 SIM interface 2.5.1.
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SARA-G3 and SARA-U2 series - System Integration Manual Guidelines for single SIM card connection without detection An application circuit for the connection to a single removable SIM card placed in a SIM card holder is described in Figure 54, where the optional SIM detection feature is not implemented (see the circuit described in Figure 56 if the SIM detection feature is required).
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SARA-G3 and SARA-U2 series - System Integration Manual Guidelines for single SIM chip connection An application circuit for the connection to a single solderable SIM chip (M2M UICC Form Factor) is described in Figure 55, where the optional SIM detection feature is not implemented (see the circuit described in Figure 56 if the SIM detection feature is required).
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SARA-G3 and SARA-U2 series - System Integration Manual Guidelines for single SIM card connection with detection SIM card detection is not supported by SARA-G300-00S and SARA-G310-00S modules. An application circuit for the connection to a single removable SIM card placed in a SIM card holder is described in Figure 56, where the optional SIM card detection feature is implemented.
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SARA-G3 and SARA-U2 series - System Integration Manual Guidelines for dual SIM card / chip connection Two SIM card / chip can be connected to the SIM interface of SARA-G3 and SARA-U2 modules as described in the application circuit of Figure 57.
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SARA-G3 and SARA-U2 series - System Integration Manual  Limit capacitance and series resistance on each SIM signal (SIM_CLK, SIM_IO, SIM_RST) to match the requirements for the SIM interface (27.7 ns is the maximum allowed rise time on the SIM_CLK line, 1.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.6 Serial interfaces 2.6.1 Asynchronous serial interface (UART) 2.6.1.1 Guidelines for UART circuit design Providing the full RS-232 functionality (using the complete V.24 link) If RS-232 compatible signal levels are needed, two different external voltage translators (e.g. Maxim MAX3237E and Texas Instruments SN74AVC8T245PW) can be used to provide full RS-232 (9 lines) functionality. The Texas Instruments chip provides the translation from 1.
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SARA-G3 and SARA-U2 series - System Integration Manual Providing the TXD, RXD, RTS, CTS and DTR lines only (not using the complete V.24 link) If the functionality of the DSR, DCD and RI lines is not required, or the lines are not available:  Leave DSR, DCD and RI lines of the module unconnected and floating If RS-232 compatible signal levels are needed, two different external voltage translators (e.g. Maxim MAX3237E and Texas Instruments SN74AVC4T774) can be used.
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SARA-G3 and SARA-U2 series - System Integration Manual If only TXD, RXD, RTS, CTS and DTR lines are provided (as implemented in Figure 60 and in Figure 61) and if HW flow-control is enabled (AT&K3, default setting), the power saving can be activated as it can be done when the complete UART link is provided (9-wire, as implemented in Figure 58 and in Figure 59), i.e.
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SARA-G3 and SARA-U2 series - System Integration Manual If a 3.0 V Application Processor is used, appropriate unidirectional voltage translators must be provided using the module V_INT output as 1.8 V supply, as described in Figure 63. Application Processor (3.0V DTE) Unidirectional Voltage Translator 3V0 VCC C1 VCCA DIR1 DIR3 TxD A1 B1 A2 B2 RTS A3 B3 CTS A4 B4 DIR2 DIR4 1V8 TP VCCB RxD SARA-G3 / SARA-U2 (1.
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SARA-G3 and SARA-U2 series - System Integration Manual If a 1.8 V application processor is used, the circuit that should be implemented as described in Figure 64: Application Processor (1.8V DTE) SARA-G3 / SARA-U2 (1.8V DCE) TxD 0Ω TP 0Ω TP 0Ω TP 12 TXD 13 RXD 10 RTS 11 CTS DTR 9 DTR DSR 6 DSR RI 7 RI DCD 8 DCD RxD RTS TP CTS GND GND Figure 64: UART interface application circuit with partial V.24 link (3-wire) in the DTE/DCE serial communication (1.8 V DTE) If a 3.
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SARA-G3 and SARA-U2 series - System Integration Manual If power saving is enabled the application circuit with the TXD and RXD lines only is not recommended. During command mode the DTE must send to the module a wake-up character or a dummy “AT” before each command line (see section 1.9.1.4 for the complete description), but during data mode the wake-up character or the dummy “AT” would affect the data communication.
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SARA-G3 and SARA-U2 series - System Integration Manual The circuit with a 1.8 V application processor should be implemented as described in Figure 64. Application Processor (1.8V DTE) SARA-G3 series (1.8V DCE) TxD RxD 0 ohm TestPoint 0 ohm TestPoint 29 TXD_AUX 28 RXD_AUX GND GND Figure 66: UART AUX interface application circuit connecting a 1.8 V application processor If a 3.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.6.3 Universal Serial Bus (USB) USB interface is not supported by SARA-G3 modules. 2.6.3.1 Guidelines for USB circuit design The USB_D+ and USB_D- lines carry the USB serial data and signaling. The lines are used in single ended mode for full speed signaling handshake, as well as in differential mode for high speed signaling and data transfer. USB pull-up or pull-down resistors on USB_D+ and USB_D- as required by the Universal Serial Bus Revision 2.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.6.3.2 Guidelines for USB layout design The USB_D+ / USB_D- lines require accurate layout design to achieve reliable signaling at the high speed data rate (up to 480 Mb/s) supported by the USB serial interface. The characteristic impedance of the USB_D+ / USB_D- lines is specified by the Universal Serial Bus Revision 2.0 specification [14].
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SARA-G3 and SARA-U2 series - System Integration Manual 2.6.4 DDC (I2C) interface 2 DDC (I C) interface is not supported by SARA-G300 and SARA-G310 modules. 2.6.4.1 2 Guidelines for DDC (I C) circuit design General considerations 2 The DDC I C-bus master interface of SARA-G340, SARA-G350 and SARA-U2 cellular modules can be used to communicate with u-blox GNSS receivers and, on SARA-U2 modules only, it can be also used to communicate 2 with other external I C-bus slaves as an audio codec.
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SARA-G3 and SARA-U2 series - System Integration Manual Connection with u-blox 1.8 V GNSS receivers Figure 71 shows an application circuit example for connecting a SARA-G340, SARA-G350 or SARA-U2 cellular module to a u-blox 1.8 V GNSS receiver:  The SDA and SCL pins of the cellular module are directly connected to the related pins of the u-blox 1.8 V GNSS receiver, with appropriate pull-up resistors connected to the 1.8 V GNSS supply enabled after the 2 V_INT supply of the I C pins of the cellular module.
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SARA-G3 and SARA-U2 series - System Integration Manual The supply of the u-blox 1.8 V GNSS receiver can be switched off using an external p-channel MOSFET controlled by the GPIO2 pin by means of a proper inverting transistor as shown in Figure 72, implementing the “GNSS supply enable” function. If this feature is not required, the V_INT supply output can be directly connected to the u-blox 1.8 V GNSS receiver, so that it will be switched on when V_INT output is enabled.
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SARA-G3 and SARA-U2 series - System Integration Manual Connection with u-blox 3.0 V GNSS receivers Figure 73 shows an application circuit example for connecting a SARA-G340 or a SARA-G350 cellular module to a u-blox 3.0 V GNSS receiver:  The SDA and SCL pins of SARA-G340 / SARA-G350 are directly connected to the related pins of the u-blox 3.0 V GNSS receiver, with appropriate pull-up resistors connected to the 3.0 V GNSS supply enabled after 2 2 the V_INT supply of the I C pins of the cellular module.
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SARA-G3 and SARA-U2 series - System Integration Manual Figure 74 shows an application circuit example for connecting a SARA-U2 cellular module to a u-blox 3.0 V GNSS receiver:  As the SDA and SCL pins of the SARA-U2 cellular module are not tolerant up to 3.0 V, the connection to 2 2 the related I C pins of the u-blox 3.0 V GNSS receiver must be provided using a proper I C-bus Bidirectional Voltage Translator (e.g. TI TCA9406, which additionally provides the partial power down feature so that the GNSS 3.
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SARA-G3 and SARA-U2 series - System Integration Manual For additional guidelines regarding the design of applications with u-blox 3.0 V GNSS receivers see the GNSS Implementation Application Note [24] and to the Hardware Integration Manual of the u-blox GNSS receivers. 2 2.6.4.2 Guidelines for DDC (I C) layout design 2 The DDC (I C) serial interface requires the same consideration regarding electro-magnetic interference as any other digital interface.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.7 Audio interface 2.7.1 Analog audio interface SARA-G300, SARA-G310 and SARA-U2 modules do not provide analog audio interface. 2.7.1.
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SARA-G3 and SARA-U2 series - System Integration Manual  Provide proper parts on each line connected to the receiver / speaker as noise and EMI improvements, to minimize RF coupling, according to EMC requirements of the custom application. Mount a 27 pF bypass capacitor (e.g. Murata GRM1555C1H270J) from each speaker line to solid ground plane (C6 and C7 capacitors in Figure 75). o  Provide additional ESD protection (e.g.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.7.1.2 Guidelines for microphone and loudspeaker connection circuit design (hands-free mode) Figure 76 shows an application circuit for the analog audio interface in hands-free mode, connecting a 2.
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SARA-G3 and SARA-U2 series - System Integration Manual SARA-G340 SARA-G350 MIC_BIAS 46 R1 C1 R2 R4 C2 MIC_P 49 C3 MIC_N 48 Microphone Connector L1 R3 L2 MIC_GND 47 J1 VCC C4 Audio Amplifier C5 D1 C10 C11 VDD SPK_P 44 SPK_N 45 C8 C9 R5 R6 MIC IN+ OUT+ IN- OUT- D2 Loud-Speaker LSPK Connector J2 GND C6 U1 C7 D3 D4 Figure 76: Analog audio interface hands-free mode application circuit Reference Description Part Number – Manufacturer C1, C10 C2, C3, C11 10 µF Capacitor Ceram
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SARA-G3 and SARA-U2 series - System Integration Manual 2.7.1.3 Guidelines for external analog audio device connection circuit design The differential analog audio I/O can be used to connect the module to an external analog audio device. Audio devices with a differential analog I/O are preferable, as they are more immune to external disturbances. Figure 77 and Table 43 describe the application circuits, following the suggested circuit design-in.
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SARA-G3 and SARA-U2 series - System Integration Manual Reference Description Part Number – Manufacturer C1, C2, C3, C4, C5, C6, C7, C8 R1, R3 R2, R4 10 µF Capacitor X5R 0603 5% 6.3 V GRM188R60J106M – Murata 0 Ω Resistor 0402 5% 0.1 W Not populated RC0402JR-070RL – Yageo Phycomp Table 43: Connection to an analog audio device 2.7.1.4 Guidelines for analog audio layout design Accurate analog audio design is very important to obtain clear and high quality audio.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.7.2 Digital audio interface SARA-G300 and SARA-G310 modules do not provide digital audio interface. 2.7.2.1 Guidelines for digital audio circuit design 2 The I S digital audio interface of SARA-G3 and SARA-U2 series modules can be connected to an external digital audio device for voice applications.
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SARA-G3 and SARA-U2 series - System Integration Manual Reference Description Part Number – Manufacturer C1 C2, C4, C5, C6 100 nF Capacitor Ceramic X5R 0402 10% 10V 1 µF Capacitor Ceramic X5R 0402 10% 6.3 V GRM155R71C104KA01 – Murata GRM155R60J105KE19 – Murata C3 C7, C8, C9, C10 10 µF Capacitor Ceramic X5R 0603 20% 6.
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SARA-G3 and SARA-U2 series - System Integration Manual Any external signal connected to the digital audio interface must be tri-stated or set low when the module is in power-down mode and during the module power-on sequence (at least until the activation of the V_INT supply output of the module), to avoid latch-up of circuits and allow a proper boot of the module. If the external signals connected to the cellular module cannot be tri-stated or set low, insert a multi channel digital switch (e.g.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.8 General Purpose Input/Output (GPIO) 2.8.1.1 Guidelines for GPIO circuit design The following application circuits are suggested as a general guideline for the usage of the GPIO pins available with the SARA-G340 / SARA-G350 and SARA-U2 series modules, according to the related custom function.
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SARA-G3 and SARA-U2 series - System Integration Manual Any external signal connected to the GPIOs must be tri-stated or set low when the module is in power-down mode and during the module power-on sequence (at least until the activation of the V_INT supply output of the module), to avoid latch-up of circuits and allow a proper boot of the module. If the external signals connected to the cellular module cannot be tri-stated or set low, insert a multi channel digital switch (e.g.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.11 Module footprint and paste mask Figure 82 and Table 46 describe the suggested footprint (i.e. copper mask) and paste mask layout for SARA modules: the proposed land pattern layout reflects the modules’ pins layout, while the proposed stencil apertures layout is slightly different (see the F’’, H’’, I’’, J’’, O’’ parameters compared to the F’, H’, I’, J’, O’ ones).
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SARA-G3 and SARA-U2 series - System Integration Manual 2.12 Thermal guidelines SARA-G3 and SARA-U2 series module operating temperature range and module thermal resistance are specified in the SARA-G3 series Data Sheet [1] or the SARA-U2 series Data Sheet [2].
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SARA-G3 and SARA-U2 series - System Integration Manual  Optimize the thermal design of any high-power component included in the application, as linear regulators and amplifiers, to optimize overall temperature distribution in the application device  Select the material, the thickness and the surface of the box (i.e.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.13 ESD guidelines The sections 2.13.1 and 2.13.2 are related to EMC / ESD immunity, herein described in section 2.13.1. The modules are ESD sensitive devices and the ESD sensitivity for each pin (as Human Body Model according to JESD22-A114F) is specified in SARA-G3 series Data Sheet [1] or SARA-U2 series Data Sheet [2], requiring special precautions when handling: for ESD handling guidelines see section 3.2. 2.13.
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SARA-G3 and SARA-U2 series - System Integration Manual Table 48 reports the u-blox SARA-G3 and SARA-U2 reference designs ESD immunity test results, according to the CENELEC EN 61000-4-2 [18], ETSI EN 301 489-1 [19], 301 489-7 [20], 301 489-24 [21] test requirements.
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SARA-G3 and SARA-U2 series - System Integration Manual LQG15HN39NJ02) should be implemented at the antenna port as described in the Figure 51, Figure 52 and Figure 53, as implemented in the EMC / ESD approved reference design of SARA-U2 modules The antenna interface application circuit implemented in the EMC / ESD approved reference designs of SARA-G3 and SARA-U2 series modules is described in Figure 51 in case of antenna detection circuit not implemented, and is described in Figure 52 and Table 26 in case
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SARA-G3 and SARA-U2 series - System Integration Manual 2.14 SARA-G350 ATEX integration in explosive atmospheres applications 2.14.1 General guidelines SARA-G350 ATEX modules are certified as components intended for use in potentially explosive atmospheres (see section 4.
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SARA-G3 and SARA-U2 series - System Integration Manual The following input and equivalent parameters must be considered integrating a SARA-G350 ATEX module in an application device intended for use in potentially explosive atmospheres:  Total internal capacitance, Ci = 103 µF  Total internal inductance, Li = 4.1 µH  The module does not contain blocks which increase the voltage (e.g. like step-up, duplicators, boosters, etc.
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SARA-G3 and SARA-U2 series - System Integration Manual Series current limiters The use of three series blocking diodes in circuits of Level of Protection ‘ia’ is permitted, however, other semiconductors and controllable semiconductor devices shall be used as series current-limiting devices only in Level of Protection ‘ib’ or ‘ic’ apparatus.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.15 Schematic for SARA-G3 and SARA-U2 series module integration 2.15.1 Schematic for SARA-G300 / SARA-G310 modules integration Figure 84 is an example of a schematic diagram where a SARA-G300 / SARA-G310 module is integrated into an application board, using all the available interfaces and functions of the module.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.15.2 Schematic for SARA-G340 / SARA-G350 modules integration Figure 85 is an example of a schematic diagram where a SARA-G340 / SARA-G350 module is integrated into an application board, using all the available interfaces and functions of the module.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.15.3 Schematic for SARA-U2 series modules integration Figure 86 is an example of a schematic diagram where a SARA-U2 module is integrated into an application board, using all the available interfaces and functions of the module.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.16 Design-in checklist This section provides a design-in checklist. 2.16.1 Schematic checklist The following are the most important points for a simple schematic check:   DC supply must provide a nominal voltage at VCC pin above the minimum operating range limit.  VCC supply should be clean, with very low ripple/noise: provide the suggested bypass capacitors, in particular if the application device integrates an internal antenna.
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SARA-G3 and SARA-U2 series - System Integration Manual 2.16.2 Layout checklist The following are the most important points for a simple layout check:  Check 50  nominal characteristic impedance of the RF transmission line connected to the ANT pad (antenna RF input/output interface).  Follow the recommendations of the antenna producer for correct antenna installation and deployment (PCB layout and matching circuitry).
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SARA-G3 and SARA-U2 series - System Integration Manual 3 Handling and soldering No natural rubbers, no hygroscopic materials or materials containing asbestos are employed. 3.1 Packaging, shipping, storage and moisture preconditioning For information pertaining to reels and tapes, Moisture Sensitivity levels (MSD), shipment and storage information, as well as drying for preconditioning see the SARA-G3 series Data Sheet [1] or the SARA-U2 series Data Sheet [2] and the u-blox Package Information Guide [27].
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SARA-G3 and SARA-U2 series - System Integration Manual 3.3 Soldering 3.3.1 Soldering paste Use of "No Clean" soldering paste is strongly recommended, as it does not require cleaning after the soldering process has taken place. The paste listed in the example below meets these criteria. Soldering Paste: OM338 SAC405 / Nr.143714 (Cookson Electronics) Alloy specification: 95.5% Sn / 3.9% Ag / 0.6% Cu (95.5% Tin / 3.9% Silver / 0.6% Copper) 95.5% Sn / 4.0% Ag / 0.5% Cu (95.5% Tin / 4.0% Silver / 0.
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SARA-G3 and SARA-U2 series - System Integration Manual To avoid falling off, modules should be placed on the topside of the motherboard during soldering. The soldering temperature profile chosen at the factory depends on additional external factors like choice of soldering paste, size, thickness and properties of the base board, etc. Exceeding the maximum soldering temperature and the maximum liquidus time limit in the recommended soldering profile may permanently damage the module.
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SARA-G3 and SARA-U2 series - System Integration Manual 3.3.5 Repeated reflow soldering Only a single reflow soldering process is encouraged for boards with a SARA-G3 and SARA-U2 series module populated on it. The reason for this is the risk of the module falling off due to high weight in relation to the adhesive properties of the solder. 3.3.
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SARA-G3 and SARA-U2 series - System Integration Manual 4 Approvals For the complete list of all the certification schemes approvals of SARA-G3 and SARA-U2 series modules and the corresponding declarations of conformity, see the u-blox web-site (http://www.u-blox.com). 4.
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SARA-G3 and SARA-U2 series - System Integration Manual 4.
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SARA-G3 and SARA-U2 series - System Integration Manual 4.2.3 Modifications The FCC requires the user to be notified that any changes or modifications made to this device that are not expressly approved by u-blox could void the user's authority to operate the equipment.
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SARA-G3 and SARA-U2 series - System Integration Manual o cet appareil doit accepter toute interférence, notamment les interférences qui peuvent affecter son fonctionnement Informations concernant l'exposition aux fréquences radio (RF) La puissance de sortie émise par l’appareil de sans fil u-blox Cellular Module est inférieure à la limite d'exposition aux fréquences radio d'Industrie Canada (IC).
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SARA-G3 and SARA-U2 series - System Integration Manual The conformity assessment procedure for SARA-G350 ATEX modules, referred to in Article 10 and detailed in Annex IV of Directive 1999/5/EC, has been followed with the involvement of the following Notified Body number: 1304 Thus, the following marking is included in the product: 1304 The conformity assessment procedure for SARA-U270 and SARA-U290 modules, referred to in Article 10 and detailed in Annex IV of Directive 1999/5/EC, has been followed with t
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SARA-G3 and SARA-U2 series - System Integration Manual 4.
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SARA-G3 and SARA-U2 series - System Integration Manual 5 Product testing 5.1 u-blox in-series production test u-blox focuses on high quality for its products. All units produced are fully tested. Defective units are analyzed in detail to improve the production quality. This is achieved with automatic test equipment, which delivers a detailed test report for each unit.
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SARA-G3 and SARA-U2 series - System Integration Manual  Component assembly on the device; it should be verified that: o Communication with host controller can be established o The interfaces between module and device are working o Overall RF performance test of the device including antenna Dedicated tests can be implemented to check the device.
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SARA-G3 and SARA-U2 series - System Integration Manual Wireless Antenna Application Processor AT Commands Wideband Antenna SARA-G3 SARA-U2 ANT TX IN Spectrum Analyzer or Power Meter OUT Signal Generator Application Board Wireless Antenna Application Processor AT Commands Wideband Antenna SARA-G3 SARA-U2 ANT RX Application Board Figure 89: Setup with spectrum analyzer and signal generator for radiated measurement This feature allows the measurement of the transmitter and receiver power lev
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SARA-G3 and SARA-U2 series - System Integration Manual Example of production tests for OEM manufacturer: 1.
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SARA-G3 and SARA-U2 series - System Integration Manual Appendix A Migration between LISA and SARA-G3 modules A.1 Overview Migrating between LISA-U1, LISA-U2, LISA-C2 series and SARA-G3 series module designs is a straight-forward procedure that allows customers to take maximum advantage of their hardware and software investments.
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SARA-G3 and SARA-U2 series - System Integration Manual The voltage level of all the digital interfaces of SARA and LISA modules is 1.8 V: this allows the direct connection from a 1.8 V external device (e.g. application processor) to all the modules.
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SARA-G3 and SARA-U2 series - System Integration Manual A.3 Software migration Software migration between SARA-G3 and LISA cellular modules is a straightforward procedure. Nevertheless there are some differences to be considered with firmware version. Each cellular module supports AT commands according to 3GPP standards: TS 27.007 [11], TS 27.005 [12], TS 27.010 [13] and the u-blox AT command extension. Backward compatibility has been maintained as far as possible.
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SARA-G3 and SARA-U2 series - System Integration Manual A.4.2 System functions interfaces Module power-on SARA-G3 and LISA series power-on sequence is initiated in one of the ways summarized in Table 50. For more details, see section 1.6.1 or to the relative System Integration Manual of the module [7], [8].
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SARA-G3 and SARA-U2 series - System Integration Manual A.4.3 Antenna interface RF interface for Tx/Rx antenna The same compatible external circuit can be implemented for SARA and LISA series ANT pin even if there are some differences in the operating bands frequency ranges, as summarized in Figure 92.
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SARA-G3 and SARA-U2 series - System Integration Manual A.4.4 SIM interface SIM interface The same compatible external circuit can be implemented for SARA and LISA modules: 1.8 V and 3.0 V SIM are supported. LISA-C2 modules do not need an external SIM for Sprint and Verizon mobile operators. LISA-C2 series SIM interface is hardware ready but the support of external SIM card / IC will be provided by the upcoming firmware releases.
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SARA-G3 and SARA-U2 series - System Integration Manual 2 SARA-G300, SARA-G310 and LISA-U200-00S modules do not support the DDC (I C) interface. 2 LISA-C2 modules will support the DDC (I C) interface in the upcoming firmware releases. 2 All LISA-U2 modules, except LISA-U200-00S, additionally support the communication with I C slaves by means of 2 dedicated AT commands, other than u-blox positioning receivers over the same DDC (I C) interface. A.4.
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SARA-G3 and SARA-U2 series - System Integration Manual A.4.9 Pin-out comparison between LISA and SARA-G3 Table 51 summarizes the pin electrical differences between LISA and SARA-G3 cellular modules. Pin Name N° SARA-G3 series N° LISA-C2 series LISA-U1 series LISA-U2 series Power VCC 51-53 61-63 V_BCKP 2 Normal op. range: 3.3 V – 4.4 V Extended op. range: Not applicable No high pulse current due to CDMA Not Available V_INT 4 Normal op. range: 3.35 V – 4.5 V Extended op. range: 3.00 V – 4.
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SARA-G3 and SARA-U2 series - System Integration Manual Pin Name N° SARA-G3 series N° LISA-C2 series LISA-U1 series LISA-U2 series SIM SIM_CLK 38 1.8V / 3V SIM clock 47 1.8V / 3V SIM clock 1.8V / 3V SIM clock SIM_IO 39 1.8V / 3V SIM data Internal 4.7k pull-up 48 1.8V / 3V SIM data Internal 4.7k pull-up 1.8V / 3V SIM data Internal 4.7k pull-up SIM_RST 40 1.8V / 3V SIM reset 49 1.8V / 3V SIM reset 1.8V / 3V SIM reset VSIM 41 1.8V / 3V SIM supply 50 1.8V / 3V SIM supply 1.
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SARA-G3 and SARA-U2 series - System Integration Manual Pin Name N° SARA-G3 series MIC_BIAS 46 MIC_GND 47 MIC_P 49 MIC_N 48 SPK_P 44 SPK_N 45 SARA-G340/SARA-G350: 2.
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SARA-G3 and SARA-U2 series - System Integration Manual Pin Name N° SARA-G3 series N° LISA-C2 series LISA-U1 series LISA-U2 series Not Available 52 Not Available Not Available 1.8 V, 13/26 MHz Out Driver strength: 4 mA LISA-U200-00S: N.A. SARA-G340/SARA-G350: 1.8 V, configurable GPIO Default: Pin disabled Driver strength: 6 mA Inner pull-down: 51 µA SARA-G340/SARA-G350: 1.8 V, configurable GPIO Default: GNSS supply ena. Driver strength: 6 mA Inner pull-down: 51 µA SARA-G340/SARA-G350: 1.
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SARA-G3 and SARA-U2 series - System Integration Manual Pin Name N° SARA-G3 series N° LISA-C2 series LISA-U1 series LISA-U2 series GPIO13 Not Available 58 Not Available Not Available GPIO14 Not Available 59 Not Available Not Available 1.8 V, configurable GPIO Default: SPI_SRDY Driver strength: 6 mA Inner pull-down: 200 µA 1.
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SARA-G3 and SARA-U2 series - System Integration Manual B Migration between SARA-G3 and SARA-U2 B.
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SARA-G3 and SARA-U2 series - System Integration Manual B.2 Pin-out comparison between SARA-G3 and SARA-U2 SARA-G3 SARA-U2 Pin No Pin Name Description Pin Name Description 1 GND Ground GND Ground 2 V_BCKP RTC Supply I/O Output characteristics: 2.3 V typ, 2 mA max Input op. range: 1.0 V – 2.4 V V_BCKP RTC Supply I/O Output characteristics: 1.8 V typ, 3 mA max Input op. range: 1.0 V – 1.9 V 3 GND Ground GND Ground 4 V_INT Interfaces Supply Out Output characteristics: 1.
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SARA-G3 and SARA-U2 series - System Integration Manual SARA-G3 SARA-U2 Pin No Pin Name Description Pin Name Description Remarks for migration 25 GPIO4 / RSVD 1.8 V GPIO / Reserved Default: GNSS RTC sharing Driver strength: 6 mA Internal pull-down: ~35 k GPIO4 1.8 V GPIO Default: GNSS RTC sharing Driver strength: 6 mA Internal pull-down: ~9 k No functional difference 26 SDA / RSVD I C Data I/O / Reserved 1.8 V, open drain Driver strength: 3 mA 2 SDA I C Data I/O 1.
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SARA-G3 and SARA-U2 series - System Integration Manual B.3 Schematic for SARA-G3 and SARA-U2 integration Figure 94 shows an example of schematic diagram where a SARA-G3 or SARA-U2 series module can be integrated into the same application board, using all the available interfaces and functions of the modules. The different mounting options for the external parts are highlighted in different colors as described in the legend, according to the interfaces supported by the relative modules.
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SARA-G3 and SARA-U2 series - System Integration Manual C Glossary 3GPP 3rd Generation Partnership Project ADC Analog to Digital Converter AP Application Processor AT AT Command Interpreter Software Subsystem, or attention CS Coding Scheme CSD Circuit Switched Data CTS Clear To Send DC Direct Current DCD Data Carrier Detect DCE Data Communication Equipment DCS Digital Cellular System DDC Display Data Channel interface DL Down-link (Reception) DRX Discontinuous Reception DSP Digi
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SARA-G3 and SARA-U2 series - System Integration Manual 2 Inter-Integrated Circuit interface 2 IS Inter IC Sound interface IP Internet Protocol LCC Leadless Chip Carrier LDO Low-Dropout LGA Land Grid Array LNA Low Noise Amplifier M2M Machine-to-Machine MCS Modulation Coding Scheme N/A Not Applicable N.A.
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SARA-G3 and SARA-U2 series - System Integration Manual Related documents [1] u-blox SARA-G3 series Data Sheet, Docu No UBX-13000993 [2] u-blox SARA-U2 series Data Sheet, Docu No UBX-13005287 [3] u-blox AT Commands Manual, Docu No UBX-13002752 [4] u-blox LISA-C200 series Data Sheet, Docu No UBX-13000623 [5] u-blox LISA-U1 series Data Sheet, Docu No UBX-13002048 [6] u-blox LISA-U2 series Data Sheet, Docu No UBX-13001734 [7] u-blox LISA-C200 & FW75-C200 System Integration Manual, Docu No UBX-1300
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SARA-G3 and SARA-U2 series - System Integration Manual Revision history Revision Date Name Status / Comments - 30-Oct-2012 sses Initial release 1 28-Mar-2013 sses Updated status to Advance Information Updated suggested paste mask Updated current consumption description Updated voice-band processing system block diagram Updated DDC (I2C) application circuit for 3V u-blox GPS/GNSS receivers 2 12-Apr-2013 lpah Updated status to Preliminary (Last revision with old doc number, GSM.
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SARA-G3 and SARA-U2 series - System Integration Manual Contact For complete contact information visit us at www.u-blox.com. u-blox Offices North, Central and South America u-blox America, Inc. Phone: +1 703 483 3180 E-mail: info_us@u-blox.com Regional Office West Coast: Phone: +1 408 573 3640 E-mail: info_us@u-blox.com Headquarters Europe, Middle East, Africa u-blox AG Phone: +41 44 722 74 44 E-mail: info@u-blox.com Support: support@u-blox.