User's Manual

ManualsBrandsTelit Communications ManualsElectronicsQuad band GSM/GPRS module

GE910 Hardware User Guide

1vv0300962 Rev.9-bis3 – 2013-05-20

Summary of content (87 pages)

PAGE 1
GE910 Hardware User Guide 1vv0300962 Rev.
PAGE 2
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 APPLICABILITY TABLE PRODUCT GE910-QUAD GE910-GNSS Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved Mod. 0805 2011-07 Rev.
PAGE 3
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE Notice While reasonable efforts have been made to assure the accuracy of this document, Telit assumes no liability resulting from any inaccuracies or omissions in this document, or from use of the information obtained herein. The information in this document has been carefully checked and is believed to be entirely reliable. However, no responsibility is assumed for inaccuracies or omissions.
PAGE 4
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 Usage and Disclosure Restrictions License Agreements The software described in this document is the property of Telit and its licensors. It is furnished by express license agreement only and may be used only in accordance with the terms of such an agreement. Copyrighted Materials Software and documentation are copyrighted materials. Making unauthorized copies is prohibited by law.
PAGE 5
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 Contents 1. Introduction.....................................................................................................................................................................8 1.1. 1.2. 1.3. 1.4. 1.5. 1.6. Scope........................................................................................................................................................................8 Audience .............................................
PAGE 6
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 7.4.8. 7.4.9. 7.4.10. External LNA Gain and Noise Figure ...........................................................................................................49 Powering the External LNA (active antenna)................................................................................................49 External LNA Enable.............................................................................................................................
PAGE 7
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 17. Document History.....................................................................................................................................................87 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved Mod. 0805 2011-07 Rev.
PAGE 8
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 1. Introduction 1.1. Scope The aim of this document is the description of some hardware solutions useful for developing a product with the Telit GE910 module. 1.2. Audience This document is intended for Telit customers, who are integrators, about to implement their applications using our GE910 modules. 1.3.
PAGE 9
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 1.4. Document Organization This document contains the following chapters: Chapter 1: “Introduction” provides a scope for this document, target audience, contact and support information, and text conventions. Chapter 2: “Overview” provides an overview of the document. Chapter 3: “GE910 Module Connections” deals with the pin out configuration and layout. Chapter 4: “Hardware Commands” How to operate on the module via hardware.
PAGE 10
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 1.5. Text Conventions Danger – This information MUST be followed or catastrophic equipment failure or bodily injury may occur. Caution or Warning – Alerts the user to important points about integrating the module, if these points are not followed, the module and end user equipment may fail or malfunction. Tip or Information – Provides advice and suggestions that may be useful when integrating the module. All dates are in ISO 8601 format, i.e.
PAGE 11
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 2. Overview The aim of this document is the description of some hardware solutions useful for developing a product with the Telit GE910 module. In this document all the basic functions of a mobile phone will be taken into account; for each one of them a proper hardware solution will be suggested and eventually the wrong solutions and common errors to be avoided will be evidenced.
PAGE 12
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 3. GE910 module connections 3.1. PIN-OUT PAD Signal I/O Function Type USB differential Data (+) 3.3V COMMENT USB 2.0 COMMUNICATION PORT B15 USB_D+ I/O C15 USB_D- I/O USB differential Data (-) 3.3V A13 VUSB AI Power sense for USB presence 5V Accepted range 1.8V to 5V Serial data input from DTE CMOS 1.
PAGE 13
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 C9 GPIO_02 I/O GPIO_02 CMOS 1.8V C10 GPIO_03 I/O GPIO_03 CMOS 1.8V C11 GPIO_04 I/O GPIO_04 CMOS 1.8V B14 GPIO_05 I/O GPIO_05 / RFTXMON CMOS 1.8V C12 GPIO_06 I/O GPIO_06 CMOS 1.8V C13 GPIO_07 I/O GPIO_07 CMOS 1.8V K15 GPIO_08 I/O GPIO_08 CMOS 1.8V L15 GPIO_09 I/O GPIO_09 CMOS 1.8V G15 GPIO_10 I/O GPIO_10 CMOS 1.
PAGE 14
GE910 Hardware User Guide 1vv0300962 Rev.
PAGE 15
GE910 Hardware User Guide 1vv0300962 Rev.
PAGE 16
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 3.2. Important Pin-out to Debug in customer’s application The followings pins are necessary to debug the application when the module is assembled on customer’s application. We recommend connecting them also to dedicated test point.
PAGE 17
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 3.3.
PAGE 18
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 4. Hardware Commands 4.1. Turning ON the GE910 To turn on the GE910 the pad ON-OFF* must be tied low for at least 5 seconds and then released. The maximum current that can be drained from the ON-OFF* pad is 0.2mA. NOTE: Don't use any pull up resistor on the ON* line, it is internally pulled up. Using pull up resistor may bring to latch up problems on the GE910 power regulator and improper power on/off of the module.
PAGE 19
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 The flow chart showing the proper TURN ON procedure is displayed below: MODEM ON Proc. WAIT > 1 Sec PWMON HIGH? Y N ON_OFF = LOW WAIT > 5 Sec ON_OFF = Z PWMON HIGH? Y Start AT CMD. N HW unconditional SHUTDOWN NOTE: In order to avoid a back powering effect it is recommended to avoid having any HIGH logic level signal applied to the digital pins of the GE910 when the module is powered off or during an ON/OFF transition.
PAGE 20
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 The Flow chart showing the AT commands managing procedure is displayed below: Start AT CMD. DELAY > 300msec Enter AT AT answer ‘OK’ into 1 sec ? Y AT init sequence. N HW unconditional SHUTDOWN MODEM ON Proc. NOTE: Do not give any commands before 300 msec after ON/OFF procedure. Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved Mod. 0805 2011-07 Rev.
PAGE 21
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 ON-OFF Circuit Examples: 1- If your system does not have Open Collector bus, use this interface: 2- Using a simple ON/OFF external switch: Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved Mod. 0805 2011-07 Rev.
PAGE 22
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 4.2. Turning OFF the GE910 Turning OFF of the device can be done in two ways: • via AT command (see GE910 Software User Guide, AT#SHDN) • by tying low pin ON_OFF* for at least 2s Either ways, the device issues a detach request to network informing that the device will not be reachable any more. To turn OFF the GE910 the pad ON-OFF* must be tied low for at least 2 seconds and then released.
PAGE 23
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 The following flow chart shows the proper HW TURN OFF procedure: MODEM OFF Proc. WAIT > 1 Sec PWMON HIGH? N Y ON_OFF = LOW WAIT > 2s ON_OFF = Z WAIT > 15s PWMON HIGH? N MODEM ON Proc. Y HW unconditional SHUTDOWN Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved Mod. 0805 2011-07 Rev.
PAGE 24
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 4.3. HW Unconditional Shutdown on GE910 WARNING: The hardware unconditional Shutdown must not be used during normal operation of the device since it does not detach the device from the network. It shall be kept as an emergency exit procedure to be done in the rare case that the device gets stacked waiting for some network or SIM responses.
PAGE 25
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 In the following flow chart is detailed the proper HW restart procedure: HW unconditional SHUTDOWN HW SHUTDOWN* = LOW Delay > 200ms HW SHUTDOWN* = Z PWRMON = HIGH N Modem ON Proc. Y Disconnect PWR supply NOTE: In order to avoid a back powering effect it is recommended to avoid having any HIGH logic level signal applied to the digital pins of the GE910 when the module is powered off or during an ON/OFF transition.
PAGE 26
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 5. Power Supply The power supply circuitry and board layout are a very important part in the full product design and they strongly reflect on the product overall performances, hence read carefully the requirements and the guidelines that will follow for a proper design. 5.1.
PAGE 27
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 5.2. Power Consumption The GE910 power consumptions are: GE910 Mode Average (mA) @3.
PAGE 28
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 5.2.1. Power consumption Plots This document section is showing the typical Current consumption plots (using Agilent 66319D) in the normal working conditions of the module. GSM900 – Voice Call – Power level 5 Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved Mod. 0805 2011-07 Rev.
PAGE 29
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 GSM900 – GPRS Call – Power level 5 - 1 Slot TX GSM900 – GPRS Call – Power level 5 - 2 Slot TX, 3 Slot RX Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved Mod. 0805 2011-07 Rev.
PAGE 30
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 DCS1800 – Voice Call – Power level 0 DCS1800 – GPRS Call – Power level 0 – 1 Slot TX Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved Mod. 0805 2011-07 Rev.
PAGE 31
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 PCS1900 – GPRS Call – Power level 0 - 2 Slot TX, 3 Slot RX Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved Mod. 0805 2011-07 Rev.
PAGE 32
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 5.3. General Design Rules The principal guidelines for the Power Supply Design embrace three different design steps: • • • 5.3.1. the electrical design the thermal design the PCB layout Electrical Design Guidelines The electrical design of the power supply depends strongly from the power source where this power is drained. We will distinguish them into three categories: • • • 5.3.1.1.
PAGE 33
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 5.3.1.2. + 12V input Source Power Supply Design Guidelines • • • • • • • • The desired output for the power supply is 3.8V, hence due to the big difference between the input source and the desired output, a linear regulator is not suited and shall not be used. A switching power supply will be preferable because of its better efficiency especially with the 2A peak current load represented by the GE910.
PAGE 34
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 5.3.1.3. Battery Source Power Supply Design Guidelines • The desired nominal output for the power supply is 3.8V and the maximum voltage allowed is 4.2V, hence a single 3.7V Li-Ion cell battery type is suited for supplying the power to the Telit GE910 module. WARNING: The three cells Ni/Cd or Ni/MH 3,6 V Nom.
PAGE 35
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 5.3.2. Thermal Design Guidelines The thermal design for the power supply heat sink should be done with the following specifications: See section 6.2 Power Consumption NOTE: The average consumption during transmissions depends on the power level at which the device is requested to transmit by the network. The average current consumption hence varies significantly.
PAGE 36
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 5.3.3. Power Supply PCB layout Guidelines As seen on the electrical design guidelines the power supply shall have a low ESR capacitor on the output to cut the current peaks and a protection diode on the input to protect the supply from spikes and polarity inversion. The placement of these components is crucial for the correct working of the circuitry. A misplaced component can be useless or can even decrease the power supply performances.
PAGE 38
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 6. GSM Radio Section The antenna connection and board layout design are the most important aspect in the full product design as they strongly affect the product overall performances, hence read carefully and follow the requirements and the guidelines for a proper design. 6.1.
PAGE 39
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 Furthermore if the device is developed for the US market and/or Canada market, it shall comply with the FCC and/or IC approval requirements. This device is to be used only for mobile and fixed application.
PAGE 40
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 6.3. PCB Guidelines in case of FCC certification In the case FCC certification is required for an application using GE910, according to FCC KDB 996369 for modular approval requirements, the transmission line has to be similar to that implemented on GE910 interface board and described in the following chapter. 6.3.1.
PAGE 41
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 6.3.2. Transmission line measurements HP8753E VNA (Full-2-port calibration) has been used in this measurement session. A calibrated coaxial cable has been soldered at the pad corresponding to GE910 RF output; a SMA connector has been soldered to the board in order to characterize the losses of the transmission line including the connector itself. During Return Loss / impedance measurements, the transmission line has been terminated to 50 Ω load.
PAGE 42
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 Line input impedance (in Smith Chart format, once the line has been terminated to 50 Ω load) is shown in the following figure: Insertion Loss of G-CPW line plus SMA connector is shown below: Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved Mod. 0805 2011-07 Rev.
PAGE 43
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 6.4. GSM Antenna - Installation Guidelines • Install the antenna in a place covered by the GSM signal.
PAGE 44
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 7. Global Navigation Satellite System (GE910-GNSS) The GNSS part of GE910-GNSS module is a new age of receiver that can simultaneously search and track satellite signals from multiple satellite constellations. This multi-GNSS receiver uses the entire spectrum of GNSS systems available: GPS, Glonass, Galileo and QZSS.
PAGE 45
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 7.2. GNSS Signals Pinout GNSS SECTION ANTENNA GNSS R9 - GNSS Antenna (50 ohm) RF G14 GNSS_EN* I External GNSS ON-OFF VBATT ref. J14 GNSS_NMEA_TX O UART NMEA Output 1.8V K14 R7 GNSS_NMEA_RX GNSS_LNA_EN I O UART NMEA Input GNSS External LNA Enable 1.8V 1.8V 7.3.
PAGE 46
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 7.4.1. RF Signal Requirements Thanks to the internal LNA it amplifies the GNSS signals and provides enough gain for the receiver to use a passive antenna. A very low noise design is utilized to provide maximum sensitivity. For better performance the system requires an external BIAS-T and antenna voltage supply for active antenna. 7.4.2. GNSS Antenna – PCB Line Guidelines • Ensure that the antenna line impedance is 50ohm.
PAGE 47
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 signal. The system designer needs to make tradeoffs in his application to choose the better solution. Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved Mod. 0805 2011-07 Rev.
PAGE 48
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 7.4.4. GNSS Antenna Gain Antenna gain is defined as the extra signal power from the antenna as compared to a theoretical isotropic antenna (equally sensitive in all directions). For example, a 25x25mm2 patch antenna on a reference ground plane (usually 70x70mm2) will give an antenna gain at zenith of 5 dBic. A smaller 18mm by 18mm square patch on a reference ground plane (usually 50x50mm2) will give an antenna gain at zenith of 2 dBic.
PAGE 49
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 7.4.6. RF Trace Losses RF Trace losses are difficult to estimate on a PCB without having the appropriate tables or RF simulation software to estimate what the losses would be. A good rule of thumb would be to keep the RF traces as short as possible, make sure they are 50 ohms impedance and don’t contain any sharp bends. 7.4.7.
PAGE 50
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 7.4.10. External LNA Enable The GE910 is already provided by an internal LNA. In case the Application needs to include an additional LNA stage, the module is provided by a digital signal usable to enable the power supply of the external amplifier. The signal is set to High only when the GPS receiver is active. The electrical characteristics of the GPS_LNA_EN signal are: Level Output High Level Output Low Level Min [V] 1.6 0V Max [V] 1.9 0.
PAGE 51
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 8. Logic Level Specifications Where not specifically stated, all digital interface circuits work at 1.8V CMOS logic levels. The following table shows the logic level specifications used in the GE910 interface circuits: Absolute Maximum Ratings -Not Functional Parameter Min Max Input level on any digital pin -0.3V +2.1V (CMOS 1.8) when ON Operating Range - Interface levels (1.8V CMOS) Level Min Max Input high level 1.5V 1.
PAGE 52
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 9. USB Port The GE910 includes one integrated universal serial bus (USB) transceiver USB 2.0 FS. 9.1. USB 2.0 FS This port is compliant with the USB 2.0 FS (Full Speed) specifications. The following table is listing the available signals: PAD B15 Signal I/O USB_D+ I/O Function USB differential Data (+) Type 3.3V C15 USB_D- I/O USB differential Data (-) 3.3V A13 VUSB AI Power sense for USB presence 5V COMMENT Accepted range 1.
PAGE 53
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 10. Serial Ports The serial port on the GE910 is the core of the interface between the module and OEM hardware. 3 serial ports are available on the module: • • • 10.1. MODEM SERIAL PORT 1 (Main) MODEM SERIAL PORT 2 (Auxiliary) MODEM SERIAL PORT 3 (NMEA on GE910-GNSS products).
PAGE 54
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 NOTE: OE connected to VAUX pin may be a useful solution to avoid Back-Powering by means of disabling the bus, not to supply a voltage level, while modem is OFF. Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved Mod. 0805 2011-07 Rev.
PAGE 55
GE910 Hardware User Guide 1vv0300962 Rev.
PAGE 56
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 10.2. RS232 level translation In order to interface the GE910 with a PC com port or a RS232 (EIA/TIA-232) application a level translator is required. This level translator must: • invert the electrical signal in both directions; • change the level from 0/1.
PAGE 57
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 An example of RS232 level adaptation circuitry could be done using a MAXIM transceiver (MAX218). In this case the chipset is capable to translate directly from 0/1.8V to the RS232 levels (Example done on 4 signals only). The RS232 serial port lines are usually connected to a DB9 connector with the following layout: Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved Mod. 0805 2011-07 Rev.
PAGE 58
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 11. Audio Section Overview The audio paths are: • • Digital Voice Interface (DVI). Analog Front-End. 11.1. Digital Voice Interface (DVI) 11.1.1.
PAGE 59
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 Vmic 1K ÷10K MIC+ 100n 2÷5v 1u÷10u ADC + INPUT - 2.2K MIC- 100n 100 33pF TELIT MODULE 33pF + GND - If a "balanced way" is anyway desired, much more care has to be taken to Vmic noise and ground noise; also the 33pF-100Ohm-33pF П-RF filter has to be doubled (one each wire).
PAGE 60
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 11.2.2. LINE-IN connection MIC+ 100n 100 33pF ADC MIC- 100n 100 33pF TELIT MODULE 33pF GND MIC+ 100n LINE_IN+1 Remote_GND 100 33pF ADC 33pF + INPUT - 33pF + INPUT MIC- 100n 100 33pF TELIT MODULE 33pF LINE_IN+ LINE_IN- GND If the audio source is not a mike but a different device, the following connections can be done. Place 100nF capacitor in series with both inputs, so the DC current is blocked.
PAGE 61
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 11.2.3. EAR connection EAR+ + DAC OUTPUT EAR- TELIT MODULE The audio output of the GE910 is balanced, this is helpful to double the level and to reject common mode (click and pop are common mode and therefore rejected); furthermore the output stage is class-D, so it can manage directly a loudspeaker with electrical impedance of at least 8Ohm. This stage is powered by switching from VBATT to GND at a frequency ranging from 0.
PAGE 62
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 EAR+ + DAC OUTPUT - EAR- TELIT MODULE GND L-C filtering for LOW impedance load. EAR+ + DAC OUTPUT - EAR- TELIT MODULE GND HiZ CIRCUITRY R-C filtering for HIGH impedance load. Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved Mod. 0805 2011-07 Rev.
PAGE 63
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 11.2.4. Electrical Characteristics 11.2.4.1. Input Lines Line Type Microphone/Line-in path Differential Coupling capacitor Differential input resistance ≥ 100nF 10kΩ Levels To have 0dBm0 @1KHz (*) Differential input voltage AT#HFMICG=0 290mVrms AT#HFMICG=1 (+6dB) 145mVrms AT#HFMICG=2 (+12dB) 72mVrms AT#HFMICG=3 (+18dB) 36mVrms AT#HFMICG=4 (+24dB) 18mVrms AT#HFMICG=5 (+30dB) 9mVrms AT#HFMICG=6 (+36dB) 4.
PAGE 64
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 11.2.4.2. Output Lines EAR/Line-out Output Direct connection Differential line coupling (VDC=1.3÷1.6V) output load resistance ≥8Ω signal bandwidth max. differential output voltage 250÷3400Hz (@ -3dB with default filter) 1120mVpp @3.
PAGE 65
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 12. General Purpose I/O The general purpose I/O pads can be configured to act in three different ways: • • • input output alternate function (internally controlled) Input pads: they report the digital value (high or low) present on the pad at the moment of reading. Output pads: can be written, set the output value of the pad, and read. Alternate function pad: internally controlled by the GE910 firmware and acts depend on implemented function.
PAGE 66
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 12.1. Using a GPIO Pad as INPUT The GPIO pads, when used as inputs, can be connected to a digital output of another device and report its status, provided this device has interface levels compatible with the 1.8V CMOS levels of the GPIO. If the digital output of the device to be connected with the GPIO input pad has interface levels different from the 1.8V CMOS, then it can be buffered with an open collector transistor with a 47K pull up to 1.8V.
PAGE 67
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 12.3. Indication of network service availability The STAT_LED pin status shows information on the network service availability and Call status. In the GE910 modules, the STAT_LED usually needs an external transistor to drive an external LED. Therefore, the status indicated in the following table is reversed with respect to the pin status.
PAGE 68
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 12.4. RTC Bypass out The VRTC pin brings out the Real Time Clock supply, which is separate from the rest of the digital part, allowing having only RTC going on when all the other parts of the device are off. To this power output a backup capacitor can be added in order to increase the RTC autonomy during power off of the battery. NO Devices must be powered from this pin. WARNING: Never connect VRTC pin to VBATT. 12.5.
PAGE 69
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 13. Mounting the GE910 on your Board 13.1. General The GE910 modules have been designed in order to be compliant with a standard lead-free SMT process. 13.2. Module finishing & dimensions The GE910 overall dimensions are: • • • • Length: Width: Thickness: Weight: 28.2 mm 28.2 mm 2.25 mm 3.6 g Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved Mod. 0805 2011-07 Rev.
PAGE 70
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 13.3. Recommended foot print for the application In order to easily rework the GE910 is suggested to consider on the application a 1.5mm Inhibit area around the module. It is also suggested, as common rule for an SMT component, to avoid having a mechanical part of the application in direct contact with the module. NOTE: In the customer application, the region under INHIBIT WIRING must be clear from signal or ground paths.
PAGE 71
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 13.4. Stencil Stencil’s apertures layout can be the same of the recommended footprint (1:1), we suggest a thickness of stencil foil ≥ 120µm. 13.5. PCB pad design Non solder mask defined (NSMD) type is recommended for the solder pads on the PCB. Copper Pad Pad Solder Mask PCB SMD (Solder Mask Defined) 13.6. NSMD (Non Solder Mask Defined) Recommendations for PCB pad dimensions Units are in mm.
PAGE 72
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 It is not recommended to place via or micro-via not covered by solder resist in an area of 0.3 mm around the pads unless it carries the same signal of the pad itself (see following figure). Inhibit area for micro-via Holes in pad are allowed only for blind holes and not for through holes. When using the hole in pad, we suggest the via filling.
PAGE 73
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 13.7. Solder paste Solder paste Lead free Sn/Ag/Cu We recommend using only “no clean” solder paste in order to avoid the cleaning of the modules after assembly. 13.7.1. GE910 Solder reflow Recommended solder reflow profile tp TL tL Tsmax Tsmin ts ttp Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved Mod. 0805 2011-07 Rev.
PAGE 74
GE910 Hardware User Guide 1vv0300962 Rev.
PAGE 75
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 14. Packing system Is possible to order in two packaging system: • • 14.1. Package on reel Package on tray Packing on Reel The GE910 can be packaged on reels of 200 pieces each. See figure for module positioning into the carrier. 14.1.1. Carrier Tape Detail Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved Mod. 0805 2011-07 Rev.
PAGE 76
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 14.1.2. Reel Detail Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved Mod. 0805 2011-07 Rev.
PAGE 77
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 14.1.3. Packaging Detail Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved Mod. 0805 2011-07 Rev.
PAGE 78
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 14.2. Packing on tray The GE910 modules are packaged on trays of 20 pieces each. These trays can be used in SMT processes for pick & place handling. Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved Mod. 0805 2011-07 Rev.
PAGE 80
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 14.3. Moisture sensibility The level of moisture sensibility of the Product is “3”, according with standard IPC/JEDEC JSTD-020, take care of all the relative requirements for using this kind of components.
PAGE 81
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 15. Conformity Assessment Issues European Union - Directive 1999/5/EC The GE910-QUAD module has been evaluated against the essential requirements of the 1999/5/EC Directive. Bulgarian Czech Danish Dutch English Estonian German Greek Hungarian Finnish French Icelandic Italian С настоящето Telit Communications S.p.A.
PAGE 82
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 Latvian Lithuanian Maltese Norwegian Polish Portuguese Slovak Slovenian Spanish Swedish Ar šo Telit Communications S.p.A. deklarē, ka Quad Band GSM/GPRS module atbilst Direktīvas 1999/5/EK būtiskajām prasībām un citiem ar to saistītajiem noteikumiem. Šiuo Telit Communications S.p.A. deklaruoja, kad šis Quad Band GSM/GPRS module atitinka esminius reikalavimus ir kitas 1999/5/EB Direktyvos nuostatas. Hawnhekk, Telit Communications S.p.A.
PAGE 83
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 The conformity assessment procedure 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 Notified Body: AT4 wireless, S.A.
PAGE 84
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 FCC/IC Regulatory notices Modification statement Telit has not approved any changes or modifications to this device by the user. Any changes or modifications could void the user’s authority to operate the equipment. Telit n’approuve aucune modification apportée à l’appareil par l’utilisateur, quelle qu’en soit la nature. Tout changement ou modification peuvent annuler le droit d’utilisation de l’appareil par l’utilisateur.
PAGE 85
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 FCC Class B digital device notice This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
PAGE 86
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 16. SAFETY RECOMMANDATIONS READ CAREFULLY Be sure the use of this product is allowed in the country and in the environment required.
PAGE 87
GE910 Hardware User Guide 1vv0300962 Rev.9-bis3 2013-05-20 17. Document History Revision Date Rev.0 Rev.1 Rev.2 2011-11-11 2012-02-27 2012-06-07 Rev.3 Rev.4 Rev.5 Rev.6 Rev.7 Rev.8 Rev.9 Rev.9-bis Rev.9-bis2 Rev.9-bis3 2012-06-20 2012-06-25 2012-06-28 2012-07-27 2012-10-12 2012-10-30 2013-03-01 2013-04-24 2013-05-17 2013-05-20 Changes First Release Rev.0 Preliminary 1 First Release Rev.1 Added chapter 11.7 ADC Converter – renaming pin RESET# in HW SHUTDOWN* Chapter 5.