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LE910Cx

Hardware User Guide

1VV0301298 Rev. 1.04 - 2017-05-25

Summary of content (116 pages)

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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Applicability Table This documentation applies to the following products: Table 1: Applicability Table Module Name Description LE910C1-NA North America – AT&T with global roaming LE910C1-NS North America - Sprint variant LE910C1-AP APAC variant Reproduction forbidden without written authorization by Telit Communications S.p.A.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 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.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Usage and Disclosure Restrictions License Agreements The software described in this document is the property of Telit and its licensors. It is furnished by an 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.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Contents 1. Introduction ..................................................................................................... 13 1.1. Scope ................................................................................................................ 13 1.2. Audience .......................................................................................................... 13 1.3. Contact Information, Support..................................
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 4.2. Recommended Operating Conditions ............................................................. 43 4.3. Logic Level Specifications................................................................................. 44 4.3.1. 1.8V Pads - Absolute Maximum Ratings............................................... 44 4.3.2. 1.8V Standard GPIOs ............................................................................ 44 4.3.3. 1.8V SD Card Pads.....
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 7.5. GNSS Antenna Requirements .......................................................................... 64 7.5.1. Combined GNSS Antenna ..................................................................... 64 7.5.2. Linear and Patch GNSS Antenna........................................................... 64 7.5.3. Front End Design Considerations ......................................................... 64 7.5.4.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 9.2. Indication of Software Ready........................................................................... 90 9.3. RTC – Real Time Clock ...................................................................................... 90 9.4. VAUX Power Output ........................................................................................ 90 9.5. ADC Converter ......................................................................................
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 13. Safety Recommendations................................................................................111 14. Conformity assessment issues .........................................................................112 14.1. FCC/ISED Regulatory notices ........................................................................ 112 15. Document History ...........................................................................................
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 List of Tables Table 1: Applicability Table................................................................................................................. 2 Table 2: Related Documents ............................................................................................................ 15 Table 3: RF Bands per Regional Variant............................................................................................
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Table 40: EMC Recommendations ................................................................................................. 104 Table 41: Document Revision History ............................................................................................ 115 Reproduction forbidden without written authorization by Telit Communications S.p.A.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 List of Figures Figure 1: LE910Cx Block Diagram ..................................................................................................... 21 Figure 2: LGA Pads Layout ................................................................................................................ 41 Figure 3: LE910Cx vs. LE910 Pin-out Comparison (top view) ........................................................... 42 Figure 4: Power-on Circuit ......
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 1. Introduction 1.1. Scope This document introduces the Telit LE910Cx module and presents possible and recommended hardware solutions for developing a product based on the LE910Cx module. All the features and solutions detailed in this document are applicable to all LE910Cx variants, where “LE910Cx” refers to the variants listed in the applicability table.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Alternatively, use: http://www.telit.com/en/products/technical-support-center/contact.php For detailed information about where you can buy the Telit modules or for recommendations on accessories and components, visit: http://www.telit.com To register for product news and announcements or for product questions contact Telit’s Technical Support Center (TTSC). Our aim is to make this guide as helpful as possible.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 1.5.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 1.6.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 2. General Product Description 2.1. Overview LE910Cx is Telit’s new LTE series for IoT applications. In its most basic use case, LE910Cx can be applied as a wireless communication front-end for telematics products, offering GNSS and mobile communication features to an external host CPU through its rich interfaces. LE910Cx is available in hardware variants as listed in Table 1: Applicability Table.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 2.3. General Functionality and Main Features The LE910Cx series of cellular modules features LTE and multi-RAT modem together with an onchip powerful application processor and a rich set of interfaces. The major functions and features are listed below: Function Modem Features • Multi-RAT cellular modem for voice and data communication o LTE FDD Cat1 (Other variants) (10/5Mbps DL/UL).
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Function Interfaces Features Rich set of interfaces, including: • SD/MMC Card Interface supporting SD3.0 standard • SDIO for external WiFi transceiver supporting SDIO3.0 standard • SGMII for external Ethernet transceiver (optional) o Compliant with IEEE802.3 o Full duplex operation at 1 Gbps o Half/full duplex operation at 10/100 Mbps o Support for VLAN tagging o Support for IEEE1588, PTP (Precision Time Protocol) • USB2.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Function Features Form factor Form factor (28x28mm), accommodating the multiple RF bands in each region variant Environment and quality requirements The entire module is designed and qualified by Telit for satisfying the environment and quality requirements. Single supply module The module generates all its internal supply voltages.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 2.4. Block Diagram Figure 1 shows an overview of the internal architecture of the LE910Cx module. It includes the following sub-functions: • Application processor, Modem subsystem and Location processing with their external interfaces. These three functions are contained in a single SOC.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 2.5. 2.5.1. Environmental Requirements Temperature Range Operating temperature range -20 ~ +55°C. This range is defined by 3GPP (the global standard for wireless mobile communication). Telit guarantees its modules to comply with all the 3GPP requirements and to have full functionality of the module with in this range. -40 ~ +85°C. Telit guarantees full functionality within this range as well.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 2.6. Frequency Bands The operating frequencies in GSM850, EGSM900, DCS1800, PCS1900, WCDMA & LTE modes conform to the 3GPP specifications. 2.6.1. RF Bands per Regional Variant Table 3 summarizes all region variants within the LE910Cx family, showing the supported band sets in each variant.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 2.6.2. Reference Table of RF Bands Characteristics Table 4: RF Bands Characteristics Mode Freq. Tx (MHz) Freq. Rx (MHz) Channels Tx-Rx Offset PCS 1900 1850.2 ~ 1909.8 1930.2 ~ 1989.8 512 ~ 810 80 MHz DCS 1800 1710 ~ 1785 1805 ~ 1880 512 ~ 885 95 MHz GSM 850 824.2 ~ 848.8 869.2 ~ 893.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Mode Freq. Tx (MHz) TDSCDMA 1900 – B39 1880 ~ 1920 LTE 2100 – B1 1920 ~ 1980 Freq.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Mode Freq. Tx (MHz) LTE 800 – B19 830 ~ 845 Freq. Rx (MHz) 875 ~ 890 Channels Tx: 24000 ~ 24149 Tx-Rx Offset 45 MHz Rx: 6000 ~ 6149 LTE 800 – B20 832 ~ 862 791 ~ 821 Tx: 24150 ~ 24449 -41 MHz Rx: 6150 ~ 6449 LTE 1500 – B21 1447.9 ~ 1462.9 1495.9 ~ 1510.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 2.8. 2.8.1. LE910Cx Mechanical Specifications Dimensions The LE910Cx module’s overall dimensions are: 2.8.2. • Length: 28.2 mm, +/- 0.15 mm Tolerance • Width: 28.2 mm, +/- 0.15 mm Tolerance • Thickness: 2.2 mm, +/- 0.22 mm Tolerance Weight The nominal weight of the LE910Cx module is 9.0 gram. Reproduction forbidden without written authorization by Telit Communications S.p.A.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 3. LE910Cx Module Connections 3.1. Pin-out Table 5: LE910Cx Pin-out PAD Signal I/O Function Type Comment USB HS 2.0 Communication Port B15 USB_D+ I/O USB differential Data(+) C15 USB_D- I/O USB differential Data(-) A13 USB_VBUS AI Power sense for the internal USB transceiver A14 USB_ID AI USB ID Power 2.5V – 5.5V See note below Asynchronous UART N15 C103/TXD I Serial data input (TXD) from DTE 1.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 SPI – Serial Peripheral Interface / AUX UART F15 SPI_CLK O SPI Clock output 1.8V E15 SPI_MISO/ RX_AUX I SPI data Master Input Slave output / RX_AUX 1.8V D15 SPI_MOSI/TX_AUX O SPI data Master Output Slave input/ TX_AUX 1.8V H14 SPI_CS/GPIO11 O SPI Chip select output / GPIO11 1.8V See note below SD/MMC Card Digital I/O J12 SD/MMC_CMD O SD Command 1.8/2.95V F12 SD/MMC_CLK O SD Card Clock 1.8/2.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 WiFi (SDIO) Interface N13 WiFi_SD_CMD O Wi-Fi SD Command 1.8V L13 WiFi_SD_CLK O Wi-Fi SD Clock 1.8V J13 WiFi_SD_DATA0 I/O Wi-Fi SD Serial Data 0 1.8V M13 WiFi_SD_DATA1 I/O Wi-Fi SD Serial Data 1 1.8V K13 WiFi_SD_DATA2 I/O Wi-Fi SD Serial Data 2 1.8V H13 WiFi_SD_DATA3 I/O Wi-Fi SD Serial Data 3 1.8V L12 WiFi_SDRST O Wi-Fi Reset / Power enable control 1.8V M11 WLAN_SLEEP_CLK O Wi-Fi Sleep clock output 1.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 SIM Card Interface 2 C1 SIMCLK2 O External SIM 2 signal – Clock 1.8/2.85V D1 SIMRST2 O External SIM 2 signal – Reset 1.8/2.85V C2 SIMIO2 I/O External SIM 2 signal – Data I/O 1.8/2.85V Internally PU 20kΩ to SIMVCC2 G4 SIMIN2 I External SIM 2 signal – Presence 1.8V Active low D2 SIMVCC2 - External SIM 2 signal – Power supply for SIM 2 1.8/2.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 RF Section K1 Antenna I/O GSM/EDGE/UMTS/LTE Main antenna (50 Ohm) RF F1 ANT_DIV I UMTS/LTE antenna diversity input (50 Ohm) RF GPS Section R9 ANT_GPS I GPS antenna (50 Ohm) RF R7 GPS_LNA_EN O Enables the external regulator for GPS LNA 1.8V N9 GPS_SYNC O GPS sync signal for Dead Reckoning 1.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 I2C Interface B11 I2C_SCL I/O I2C clock 1.8V Internally PU 2.2kΩ to 1.8V B10 I2C_SDA I/O I2C Data 1.8V Internally PU 2.2kΩ to 1.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 M5 Reserved - Reserved M6 Reserved - Reserved M7 Reserved - Reserved N7 Reserved - Reserved N8 Reserved - Reserved N10 Reserved - Reserved N11 Reserved - Reserved N12 Reserved - Reserved P7 Reserved - Reserved P11 Reserved - Reserved P12 Reserved - Reserved - Reserved for future use.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Caution: GPIO_09 and WCI_RX are used as special HW flags during boot. If they are used as GPIOs, they must be connected via a 3-state buffer to avoid any undesirable effect during the boot. NOTE: When the UART signals are used as the communication port between the Host and the Modem, RTS must be connected to GND (on the module side) if flow control is not used. If the UART port is not used, UART signals can be left floating.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 3.2.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 PAD Signal Notes R9 ANT_GPS GPS antenna C4, C5, C6, C7, D3, E3, G3, K4, L4, P11 Reserved Connect to a Test Point for Telit internal use L15 GPIO_09 If not used, connect to a Test Point M9 WCI_RX If not used, connect to a Test Point Reproduction forbidden without written authorization by Telit Communications S.p.A.
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Figure 2: LGA Pads Layout LGA Pads Layout 1 C D E F G H J K L M N P ADC_IN1 SIMCLK2 SIMRST2 GND ANT_DIV GND GND GND ANT_MAIN GND VBATT VBATT_PA VBATT_PA R 2 GND RES SIMIO2 SIMVCC2 GND GND GND GND GND GND GND VBATT VBATT_PA VBATT_PA GND 3 SIMVCC RES RES RES RES RES RES RES RES RES RES GND GND GND GND 4 SIMIN RES RES GND SGMII_RX_P SGMII_RX_M SIMIN2 ADC_IN2 RES RES RES GND GND GND RFU 5 SIMIO RES RES SGMII_TX_P RES GND GND GN
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 3.4. Backward Compatibility to xE910 Family The LE910Cx is a new series in the xE910 form factor The LE910Cx is fully backward compatible to the previous xE910 in terms of: • Mechanical dimensions • Package and pin-map To support the extra features and additional interfaces, the LE910Cx introduces more pins compared to the xE910.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 4. Electrical Specifications 4.1. Absolute Maximum Ratings – Not Operational A deviation from the value ranges listed below may harm the LE910Cx module. Table 7: Absolute Maximum Ratings – Not Operational Symbol Parameter Min VBATT Battery supply voltage on pin VBATT -0.5 +6.0 [V] VBATT TRANSIENT Transient voltage on pin VBATT (< 10 ms) -0.5 +7.0 [V] VBATT_PA Battery supply voltage on pin VBATT_PA -0.3 +6.0 [V] 4.2.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 4.3. Logic Level Specifications Unless otherwise specified, all the interface circuits of the LE910Cx are 1.8V CMOS logic. Only few specific interfaces (such as USIM and SD Card) are capable of dual voltage I/O. The following tables show the logic level specifications used in the LE910Cx interface circuits. The data specified in the tables below is valid throughout all drive strengths and the entire temperature ranges.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Pad Parameter Min Max Unit RPD Pull-down resistance 30 390 [kΩ] Ci Input capacitance -- 5 [pF] Comment NOTE: Pull-Up and Pull-Down resistance of GPIO3, GPIO7 and GPIO8 is different than above mentioned GPIO3 pull resistance is specified as 10KΩ to 50KΩ 4.3.3. 1.8V SD Card Pads Table 11: Operating Range – SD Card Pads Working at 1.8V Pad 4.3.4. Parameter Min Max Unit Comment VIH Input high level 1.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Pad 4.3.5. Parameter Min Max Unit Comment VOL Output low level 0V 0.4V [V] IIL Low-level input leakage current -2 - [uA] No pull-up IIH High-level input leakage current - 2 [uA] No pull-down RPU Pull-up resistance 10 100 [kΩ] RPD Pull-down resistance 10 100 [kΩ] Ci Input capacitance 5 [pF] Dual Voltage Pads - Absolute Maximum Ratings Table 13: Absolute Maximum Ratings - Not Functional Parameter 4.3.6.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Pad 4.3.7. Parameter RPD Pull-down resistance Ci Input capacitance Min 10 Max Unit 100 [kΩ] 5 [pF] Comments SIM Card Pads @2.95V Table 15: Operating Range – For SIM Pads Operating at 2.95V Pad Parameter Min Max Unit VIH Input high level 2.1V 3.1V [V] VIL Input low level -0.3V 0.55V [V] VOH Output high level 2.25V 3.1V [V] VOL Output low level 0V 0.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 5. Hardware Commands 5.1. Turning on the LE910Cx Module To turn on the LE910Cx module, the ON/OFF# pad must be asserted low for at least 1 second and then released. The maximum current that can be drained from the ON/OFF # pad is 0.1 mA. This pin is internally pulled up; customers should expect to see ~ 800 mV on the output. Figure 4 illustrates a simple circuit to power on the module using an inverted buffer output.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Figure 5: LE910Cx Initialization and Activation VBATT 1 Sec < T_Hold < 2 Sec ON_OFF T_RDY < 20 Sec SW_RDY OK to Send AT commands 18 Sec < T_PWRMON < 20 Sec V_AUX PWRMON All interfaces and pins configured OFF State Initialization State Active State NOTE: SW_RDY signal is available on GPIO_08 (by default GPIO_08 functions as SW_RDY) NOTE: To check if the LE910Cx has completely powered on, monitor the SW_RDY signal.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 5.3. Turning OFF the LE910Cx Module Turning OFF the device can be done in four different ways: • AT#SHDN software command • Hardware shutdown using ON/OFF# pad • Hardware Unconditional Shutdown using the HW_SHUTDOWN_N When the device is shut down by a software command or a hardware shutdown, it issues a detach request to the network, informing the network that the device will not be reachable any more.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 NOTE: To check whether the device has powered OFF, monitor the PWRMON hardware line. When PWRMON goes low, the device has powered OFF. 5.3.2. Hardware Shutdown To turn off LE910Cx module, the ON/OFF# pad must be asserted low for at least 2.5 seconds and then released. Use the same circuitry and timing for power-on. When the hold time of ON/OFF# is above 2.5 seconds, LE910Cx goes into the Finalization state and in the end shuts down PWRMON.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 5.3.4. Unconditional Hardware Shutdown To unconditionally shut down the LE910Cx module, the HW_SHUTDOWN_N pad must be tied low for at least 200 milliseconds and then released.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 6. Power Supply The power supply circuitry and board layout are very important parts of the full product design, with critical impact on the overall product performance. Read the following requirements and guidelines carefully to ensure a good and proper design. 6.1. Power Supply Requirements The LE910Cx power requirements are as follows: Table 16: Power Supply Requirements Nominal supply voltage 3.8V Supply voltage range 3.4V – 4.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 6.2. General Design Rules The principal guidelines for the Power Supply Design embrace three different design steps: 6.2.1. • Electrical design • Thermal design • PCB layout Electrical Design Guidelines The electrical design of the power supply depends strongly on the power source where this power is drained. Power sources can be distinguished by three categories: 6.2.1.1.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Figure 10 shows an example of linear regulator with 5V input. Figure 10: Example of Linear Regulator with 5V Input 6.2.1.2. + 12V Input Source Power Supply – Design Guidelines • The desired output for the power supply is 3.8V. Due to the big difference between the input source and the desired output, a linear regulator is unsuitable and must not be used.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Figure 11 and Figure 12 show an example of switching regulator with 12V input. Figure 11: Example of Switching Regulator with 12V Input – Part 1 Figure 12: Example of Switching Regulator with 12V Input – Part 2 Reproduction forbidden without written authorization by Telit Communications S.p.A.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 6.2.1.3. Battery Source Power Supply – Design Guidelines • The desired nominal output for the power supply is 3.8V, and the maximum allowed voltage is 4.2V. Hence, a single 3.7V Li-Ion cell battery type is suitable for supplying the power to the LE910Cx module. NOTE: Do not use any Ni-Cd, Ni-MH, and Pb battery types directly connected to the LE910Cx module. Their use can lead to overvoltage on the LE910Cx and damage it.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 6.2.2.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 6.2.3. Power Supply PCB Layout Guidelines As seen in the electrical design guidelines, the power supply must 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 operation of the circuitry. A misplaced component can be useless or can even decrease the power supply performances.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 7. Antenna(s) Antenna connection and board layout design are the most important parts in the full product design, and they have a strong influence on the product’s overall performance. Read carefully and follow the requirements and guidelines for a good and proper design. 7.1.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Furthermore, if the device is developed for the US and/or Canada market, it must comply with the FCC and/or IC approval requirements. NOTE: This device is to be used only for mobile and fixed application. The antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 • If EM-noisy devices are not present around the line, geometries like Micro strip or Grounded Coplanar Waveguide are preferred because they typically ensure less attenuation compared to a Strip line having the same length. 7.3. GSM/WCDMA/LTE Antenna – Installation Guidelines • Install the antenna in a location with access to the network radio signal.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 7.5. GNSS Antenna Requirements LE910Cx supports an active antenna. It is recommended to use antennas as follow: • An external active antenna (GPS only) • An external active antenna plus GNSS pre-filter NOTE: The external GNSS pre-filter is required for the GLONASS application. The GNSS pre-filter must meet the following requirements: Source and load impedance = 50 Ohm • Insertion loss (1575.42–1576.42 MHz) = 1.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Table 21: Antenna Line on PCB Requirements Characteristic impedance 50 Ohm Max attenuation 0.3 dB Avoid coupling with other signals. Cold End (Ground Plane) of the antenna must be equipotential to the LE910Cx ground pads. Furthermore, if the device is developed for the US and/or Canada market, it must comply with the FCC and/or IC requirements. This device is to be used only for mobile and fixed application. 7.5.4.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 7.5.5. GNSS Antenna – Installation Guidelines • The LE910Cx, due to its sensitivity characteristics, is capable of performing a fix inside buildings. (In any case, the sensitivity could be affected by the building characteristics i.e. shielding.) • The antenna must not be co-located or operating in conjunction with any other antenna or transmitter. • The antenna must not be installed inside metal cases.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 8. Hardware Interfaces Table 22 summarizes all the hardware interfaces of the LE910Cx module. Table 22: LE910Cx Hardware Interfaces Interface LE910Cx SGMII For Ethernet support HSIC x1 SD/MMC x1 dual voltage interface for supporting SD/MMC card SDIO For WIFI support (1.8V only) USB USB2.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 8.1. USB Port The LE910Cx module includes a Universal Serial Bus (USB) transceiver, which operates at USB highspeed (480 Mbits/sec). It can also operate with USB full-speed hosts (12 Mbits/sec). It is compliant with the USB 2.0 specification and can be used for control and data transfers as well as for diagnostic monitoring and firmware update. The USB port is typically the main interface between the LE910Cx module and OEM hardware.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 8.2. HSIC Interface The application processor exposes a High-Speed Inter-Chip (HSIC). HSIC eliminates the analog transceiver from a USB interface for lower voltage operation and reduced power dissipation.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 8.4. Serial Ports The serial port is typically a secondary interface between the LE910Cx module and OEM hardware. Two serial ports are available on the module: • MODEM SERIAL PORT 1(Main) • MODEM SERIAL PORT 2 (Auxiliary) Several configurations can be designed for the serial port on the OEM hardware. The most common are: • RS232 PC com port • Microcontroller UART @ 1.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 8.4.1. Modem Serial Port 1 Signals Serial Port 1 on LE910Cx is a +1.8V UART with 7 RS232 signals. It differs from the PC-RS232 in signal polarity (RS232 is reversed) and levels. Table 25 lists the signals of LE910Cx Serial Port 1. Table 25: Modem Serial Port 1 Signals RS232 Pin No. Signal LE910Cx Pad No.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 NOTE: For minimum implementations, only the TXD and RXD lines need be connected. The other lines can be left open provided a software flow control is implemented. NOTE: According to V.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 8.4.3. RS232 Level Translation To interface the LE910Cx 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.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 NOTE: In this case, the length of the lines on the application must be taken into account to avoid problems in the case of High-speed rates on RS232. The RS232 serial port lines are usually connected to a DB9 connector as shown in Figure 14. Signal names and directions are named and defined from the DTE point of view.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 8.5. Peripheral Ports In addition to the LE910Cx serial ports, the LE910Cx supports the following peripheral ports: 8.5.1. • SPI – Serial Peripheral Interface • I2C - Inter-integrated circuit • SD/MMC Card Interface • SDIO Interface SPI – Serial Peripheral Interface The LE910Cx SPI supports the following: • Master Mode only • 1.8V CMOS level • Up to 50 MHz clock rate NOTE: SPI is supported only on the Linux side.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 8.5.2. I2C - Inter-integrated Circuit The LE910Cx supports an I2C interface on the following pins: • B11 - I2C_SCL • B10 - I2C_SDA The I2C can also be used externally by the end customer application. In addition, SW emulated I2C functionality can be used on GPIO 1-10 pins. Any GPIO (among GPIO 1-10) can be configured as SCL or SDA. LE910Cx supports I2C Master Mode only.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Table 28 lists the LE910Cx SD card signals. Table 28: SD Card Signals PAD Signal I/O Function Type Comments J12 SD/MMC_CMD O SD command 1.8/2.95V F12 SD/MMC_CLK O SD card clock 1.8/2.95V E12 SD/MMC_DATA0 I/O SD Serial Data 0 1.8/2.95V G12 SD/MMC_DATA1 I/O SD Serial Data 1 1.8/2.95V K12 SD/MMC_DATA2 I/O SD Serial Data 2 1.8/2.95V H12 SD/MMC_DATA3 I/O SD Serial Data 3 1.8/2.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 NOTE: SD/MMC is supported only on the Linux side. The power supply to the SD/MMC card is to be provided by the Host application board. The LE910Cx does not provide a dedicated power supply for the SD/MMC card. VMMC Supply is limited to 50mA thus can only supply the MMC card external pull-up resistors. Pull-up resistors must be placed on the host application board. The card detection input has an internal pull-up resistor.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 NOTE: It is recommended that WiFi_SDRST be equipped with a pull-up resistor to 1.8V on the host application to disable WiFi reset function if needed. Reproduction forbidden without written authorization by Telit Communications S.p.A.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 8.6. Audio Interface The LE910Cx module support digital audio interface. 8.6.1. Digital Audio The LE910Cx module can be connected to an external codec through the digital interface. The product provides a single Digital Audio Interface (DVI) on the following pins: Table 30: Digital Audio Interface (DVI) Signals PAD Signal I/O Function Type COMMENT B9 DVI_WAO O Digital Audio Interface (WAO) B-PD 1.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 8.6.1.1. Short Frame Timing Diagrams Figure 17: Primary PCM Timing Reproduction forbidden without written authorization by Telit Communications S.p.A.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Table 31: PCM_CODEC Timing Parameters Reproduction forbidden without written authorization by Telit Communications S.p.A.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 8.6.1.2. Long Frame Timing Diagrams Figure 18: Auxiliary PCM Timing Reproduction forbidden without written authorization by Telit Communications S.p.A.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Table 32: AUX_PCM_CODEC Timing Parameters Reproduction forbidden without written authorization by Telit Communications S.p.A.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 8.7. 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 can only be read and report digital values (high or low) present on the pad at the read time. Output pads can only be written or queried and set the value of the pad output.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 The additional GPIOs below can be used in case their initial functionality is not used: PAD Signal I/O Initial Function Alternate Function Type Drive Strength L12 GPIO_13 I/O WIFI_SDRST Configurable GPIO CMOS 1.8V 2-16 mA N13 GPIO_14 I/O WIFI_SDIO_CMD Configurable GPIO CMOS 1.8V 2-16 mA J13 GPIO_15 I/O WIFI_SDIO_D0 Configurable GPIO CMOS 1.8V 2-16 mA M13 GPIO_16 I/O WIFI_SDIO_D1 Configurable GPIO CMOS 1.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 I2C - Inter-integrated Circuit. 8.7.1. Using a GPIO Pad as Input 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 is connected with the GPIO input, the pad has interface levels different from the 1.8V CMOS.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Figure 19: GPIO Output Pad Equivalent Circuit Reproduction forbidden without written authorization by Telit Communications S.p.A.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 9. Miscellaneous Functions 9.1. Indication of Network Service Availability The STAT_LED signal shows information on the network service availability and call status. In the LE910Cx modules, the STAT_LED usually needs an external transistor to drive an external LED. The STAT_LED does not have a dedicated pin.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 9.2.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 9.5. 9.5.1. ADC Converter Description The LE910Cx module provides three 8-bit Analog to Digital converters. Each ADC reads the voltage level applied on the relevant pin, converts it, and stores it into an 8-bit word. Table 36 shows the ADC characteristics. Table 36: ADC Parameters Min 9.5.2. Max Units Input voltage range 0.1 1.7 Volt AD conversion - 8 bits Resolution - < 6.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 9.7. GNSS Characteristics The table below specifies the GNSS characteristics and expected performance The values are related to typical environment and conditions Table 37 GNSS Characteristics Typical Measurement Parameters Notes Standalone or MS Based Tracking Sensitivity -162.3 dBm Acquisition -162.3 dBm Cold Start Sensitivity -157.5 dBm Hot 1.1s GPS+GLONASS Simulator test Warm 22.1s GPS+GLONASS Simulator test Cold 29.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 10. Mounting the Module on your Board 10.1. General The LE910Cx module was designed to be compliant with a standard lead-free SMT process. 10.2. Finishing & Dimensions Figure 21 shows the mechanical dimensions of the LE910Cx module.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Figure 22: LE910Cx Mechanical Dimensions (Top view) Reproduction forbidden without written authorization by Telit Communications S.p.A.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Figure 23: LE910Cx Mechanical Dimensions (Side view) Reproduction forbidden without written authorization by Telit Communications S.p.A.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 10.3. Recommended Footprint for the Application Figure 24 shows the recommended footprint for the application board (dimensions are in mm). To facilitate replacing the LE910Cx module if necessary, it is suggested to design the application with a 1.5 mm placement inhibit area around the module. It is also suggested, as a common rule for an SMT component, to avoid having a mechanical part of the application in direct contact with the module.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 10.4. Stencil Stencil’s apertures layout can be the same as the recommended footprint (1:1). The suggested thickness of stencil foil is greater than 120 µm. 10.5. PCB Pad Design The solder pads on the PCB are recommended to be of the Non Solder Mask Defined (NSMD) type. Figure 25: PCB Pad Design Reproduction forbidden without written authorization by Telit Communications S.p.A.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 10.6. Recommendations for PCB Pad Dimensions (mm) Figure 26: PCB Pad Dimensions It is not recommended to place around the pads a via or micro-via that is not covered by solder resist in an area of 0.15 mm unless it carries the same signal as the pad itself. Micro via inside the pads are allowed. Holes in pad are allowed only for blind holes and not for through holes.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 10.7. Solder Paste We recommend using only “no clean” solder paste to avoid the cleaning of the modules after assembly. 10.7.1. Solder Reflow Figure 27 shows the recommended solder reflow profile. Figure 27: Solder Reflow Profile Reproduction forbidden without written authorization by Telit Communications S.p.A.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 11. Application Guide 11.1.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 11.2. Bypass Capacitor on Power Supplies When a sudden voltage step is asserted to or a cut from the power supplies, the steep transition causes some reactions such as overshoot and undershoot. This abrupt voltage transition can affect the device causing it to not operate or to malfunction. Bypass capacitors are needed to alleviate this behavior. The behavior can appear differently depending on the various applications.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 SIM Interface 11.3. This section presents the recommended schematics for the design of SIM interfaces on the application boards. The LE910Cx supports two external SIM interfaces. 11.3.1. SIM Schematic Example Figure 28 illustrates in particular how the application side should be designed, and what values the components should have.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 11.4. EMC Recommendations All LE910Cx signals are provided with some EMC protection. Nevertheless, the accepted level differs according to the specific pin. Table 41 lists the characteristics.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 11.5. Download and Debug Port Chose one of the following options in the design of host system to download or upgrade the Telit software and debug the LE910Cx module when it is already mounted on a host system. • UART and USB interfaces Users who use both UART and USB interfaces to communicate with the LE910Cx module must implement a USB download method in the host system to upgrade the LE910Cx when it is mounted.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 12. Packing System 12.1. Packing system – Tray The LE910Cx modules are packaged on trays of 36 pieces each as shown in Figure 29. These trays can be used in SMT processes for pick & place handling. Figure 29: Packing Reproduction forbidden without written authorization by Telit Communications S.p.A.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Figure 30: Tray Drawing Reproduction forbidden without written authorization by Telit Communications S.p.A.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 12.2. Tape & Reel The LE910Cx can be packaged on reels of 200 pieces each. See figure for module positioning into the carrier. Figure 31: Module Positioning into the Carrier Figure 32: Carrier Tape Detail Reproduction forbidden without written authorization by Telit Communications S.p.A.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Figure 33: Reel Detail Reproduction forbidden without written authorization by Telit Communications S.p.A.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Figure 34: Reel Box Detail 12.3. Moisture Sensitivity The LE910Cx module is a Moisture Sensitive Device Level 3, in accordance with standard IPC/JEDEC J-STD-020. Observe all of the requirements for using this kind of components. Reproduction forbidden without written authorization by Telit Communications S.p.A.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 13. Safety Recommendations READ CAREFULLY Be sure that the use of this product is allowed in your country and in the environment required. The use of this product may be dangerous and must be avoided in the following areas: • Where it can interfere with other electronic devices in environments such as hospitals, airports, aircrafts, etc. • Where there is risk of explosion, such as gasoline stations, oil refineries, etc.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 14. Conformity assessment issues 14.1. FCC/ISED 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.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Frequency Band Freq [MHz] 850 MHZ 1900 MHZ 1700 MHZ 900 MHZ 700 MHZ 850 1900 1700 900 700 LE910C1 NA Gain [dBi] 0.63 2.51 5.00 5.00 5.63 LE910C1 NS Gain [dBi] 6.08 8.01 5.00 N/A 5.63 L'émetteur ne doit pas être colocalisé ni fonctionner conjointement avec à autre antenne ou autre émetteur.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 L'appareil hôte doit être étiqueté comme il faut pour permettre l'identification des modules qui s'y trouvent. L'étiquette de certification du module donné doit être posée sur l'appareil hôte à un endroit bien en vue en tout temps.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 15. Document History Table 42: Document Revision History Revision Date Changes 0.1 2016-08-30 First Draft 0.2 2016-09-05 Minor edits 0.3 2016-11-13 Added information for GPIO usage as Interrupt Added clarification for AUX_UART location and backward compatibility 0.4 2016-11-30 Updated band support table Updated WIFI application note doc info Added note related to future compatibility related to few pins Updated section 3.
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LE910Cx Hardware User Guide 1VV0301298 Rev. 1.04 - 2017-05-25 Revision 1.01 Date 2017-02-16 Changes Adding Section 14: FCC/ISED Regulatory notices Changing Document History section from 14 to 15 1.02 2017-04-03 Section 14.1 – updated column “Band” to “Frequency Band” in Wireless notice table Section 8.4.1 - Added note regarding DTR 1.03 2017-04-23 Section 11.4 – Updated ESD values Updated Reference document table Section 8.3 - Updated Ethernet control interface information Section 8.5.