Telit Wireless Solutions LE910Cx Hardware User's Manual
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Telit Wireless Solutions LE910Cx Hardware User's Manual

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LE910Cx
Hardware User Guide
1VV0301298 Rev. 1.05 - 2017-06-18

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Summary of Contents for Telit Wireless Solutions LE910Cx

  • Page 1 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18...
  • Page 2 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 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.
  • Page 3 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 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.
  • Page 4 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 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.

  • Page 5: Table Of Contents

    2.8.2. Weight ....................27 LE910Cx Module Connections ................28 3.1. Pin-out ......................28 3.2. LE910Cx - Signals That Must Be Connected ............. 39 3.3. LGA Pads Layout ....................41 3.4. Backward Compatibility to xE910 Family ............42 Electrical Specifications ..................43 4.1.
  • Page 6 4.3.6. SD Card Pads @ 2.95V ................46 4.3.7. SIM Card Pads @2.95V ................. 47 Hardware Commands ..................48 5.1. Turning on the LE910Cx Module ..............48 5.2. Initialization and Activation State ..............48 5.3. Turning OFF the LE910Cx Module ..............50 5.3.1.
  • Page 7 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 7.5. GNSS Antenna Requirements ................65 7.5.1. Combined GNSS Antenna ..............65 7.5.2. Linear and Patch GNSS Antenna ............65 7.5.3. Front End Design Considerations ............65 7.5.4. GNSS Antenna – PCB Line Guidelines ........... 66 7.5.5.
  • Page 8 10.7. Solder Paste ....................100 10.7.1. Solder Reflow ..................100 Application Guide ................... 102 11.1. Debug of the LE910Cx Module in Production ..........102 11.2. Bypass Capacitor on Power Supplies ............. 103 11.3. SIM Interface ....................104 11.3.1. SIM Schematic Example ..............104 11.4.
  • Page 9 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Safety Recommendations ................112 Conformity assessment issues ................. 113 14.1. FCC/ISED Regulatory notices ................ 113 Document History ................... 116 Reproduction forbidden without written authorization by Telit Communications S.p.A. - All Rights Reserved...
  • Page 10 Table 15: Operating Range – For SIM Pads Operating at 2.95V ............47 Table 16: Power Supply Requirements .................... 53 Table 17: LE910Cx Current Consumption ..................53 Table 18: GSM / WCDMA/ LTE Antenna Requirements ..............62 Table 19: Antenna Line on PCB Requirements ................. 62 Table 20: Antenna Diversity Requirements ..................
  • Page 11 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Table 40: EMC Recommendations ....................105 Table 41: Document Revision History .................... 116 Reproduction forbidden without written authorization by Telit Communications S.p.A. - All Rights Reserved Telit Confidential Information, provided under NDA...
  • Page 12 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 ........................ 48 Figure 5: LE910Cx Initialization and Activation ................49 Figure 6: Shutdown by Software Command ..................

  • Page 13: Introduction

    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.

  • Page 14: Text Conventions

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 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).

  • Page 15: Related Documents

    Document Number Ref 1: LE9x0 AT Command User Guide 80407ST10116A Ref 2: Telit EVB HW User Guide 1VV0301249 Ref 3: LE910Cx Interface Board HW User Guide 1VV0301323 Ref 4: LE910/LE920 Digital Voice Interface Application Note 80000NT11246A Ref 5: Telit_LE920A4_LE910Cx_Wi-Fi_Interface_Application_Note_r1 80490NT11511A...

  • Page 16: Abbreviations

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 1.6. Abbreviations Term Definition Analog-to-digital converter Application-enabled Digital-to-analog converter Data Terminal Equipment Frequency division duplex GLONASS Global orbiting navigation satellite system GNSS Global navigation satellite system GPIO General-purpose input/output GPRS General packet radio services...

  • Page 17: General Product Description

    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.

  • Page 18: General Functionality And Main Features

    1VV0301298 Rev. 1.05 - 2017-06-18 2.3. General Functionality and Main Features The LE910Cx series of cellular modules features LTE and multi-RAT modem together with an on- chip powerful application processor and a rich set of interfaces. The major functions and features are listed below:...
  • Page 19 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Function Features Interfaces 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...
  • Page 20 Range). NOTE: The following interfaces are unique for the LE910Cx and may not be supported on other (former or future) xE910 family. Special care must be taken when designing the application board if future compatibility is required: - SGMII for Ethernet connectivity...

  • Page 21: Block Diagram

    Analog Audio codec for attaching external speaker amplifier and microphone • Rich IO interfaces. Depending on which LE910Cx software features are enabled, some of its interfaces that are exported due to multiplexing may be used internally and thus may not be usable by the application.

  • Page 22: Environmental Requirements

    2.5.2. RoHS Compliance As a part of the Telit corporate policy of environmental protection, the LE910Cx complies with the RoHS (Restriction of Hazardous Substances) directive of the European Union (EU directive 2011/65/EU). Reproduction forbidden without written authorization by Telit Communications S.p.A. - All Rights Reserved...

  • Page 23: 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. Table 3: RF Bands per Regional Variant Region...

  • Page 24: Reference Table Of Rf Bands Characteristics

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 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...
  • Page 25 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Mode Freq. Tx (MHz) Freq. Rx (MHz) Channels Tx-Rx Offset TDSCDMA 1900 – 1880 ~ 1920 1880 ~ 1920 Tx: 9404 ~ 9596 0 MHz Rx: 9404 ~ 9596 LTE 2100 – B1...

  • Page 26: Sensitivity

    2496 ~ 2690 2496 ~ 2690 Tx: 39650 ~ 41590 0 MHz Rx: 39650 ~ 41590 2.7. Sensitivity LE910Cx typical sensitivity levels are as follow: • -108 dBm @ 2G • -113.5 dBm @ 3G • -103 dBm @ 4G (BW=5 MHz) Reproduction forbidden without written authorization by Telit Communications S.p.A.

  • Page 27: Le910Cx Mechanical Specifications

    Thickness: 2.2 mm, +/- 0.22 mm Tolerance 2.8.2. Weight The nominal weight of the LE910Cx module is 9.0 gram. Reproduction forbidden without written authorization by Telit Communications S.p.A. - All Rights Reserved Telit Confidential Information, provided under NDA Page 27 of 117...

  • Page 28: Le910Cx Module Connections

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 LE910Cx Module Connections 3.1. Pin-out Table 5: LE910Cx Pin-out Signal Function Type Comment USB HS 2.0 Communication Port USB_D+ USB differential Data(+) USB_D- USB differential Data(-) USB_VBUS Power sense for the internal USB Power 2.5V –...
  • Page 29 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 SPI – Serial Peripheral Interface / AUX UART SPI_CLK SPI Clock output 1.8V SPI_MISO/ RX_AUX SPI data Master Input Slave output / 1.8V RX_AUX SPI_MOSI/TX_AUX SPI data Master Output Slave input/ 1.8V...
  • Page 30 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 WiFi (SDIO) Interface WiFi_SD_CMD Wi-Fi SD Command 1.8V WiFi_SD_CLK Wi-Fi SD Clock 1.8V WiFi_SD_DATA0 Wi-Fi SD Serial Data 0 1.8V WiFi_SD_DATA1 Wi-Fi SD Serial Data 1 1.8V WiFi_SD_DATA2 Wi-Fi SD Serial Data 2 1.8V...
  • Page 31 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 SIM Card Interface 2 SIMCLK2 External SIM 2 signal – Clock 1.8/2.85V SIMRST2 External SIM 2 signal – Reset 1.8/2.85V SIMIO2 External SIM 2 signal – Data I/O 1.8/2.85V Internally PU 20kΩ...
  • Page 32 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 RF Section Antenna GSM/EDGE/UMTS/LTE Main antenna (50 Ohm) ANT_DIV UMTS/LTE antenna diversity input (50 Ohm) GPS Section ANT_GPS GPS antenna (50 Ohm) GPS_LNA_EN Enables the external regulator for GPS LNA 1.8V...
  • Page 33 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 I2C Interface I2C_SCL I2C clock 1.8V Internally PU 2.2kΩ to 1.8V I2C_SDA I2C Data 1.8V Internally PU 2.2kΩ to 1.8V Power Supply VBATT Main Power Supply (Digital Section) Power VBATT Main Power Supply (Digital Section)
  • Page 34 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Reproduction forbidden without written authorization by Telit Communications S.p.A. - All Rights Reserved...
  • Page 35 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Ground Ground Ground Ground Ground Ground Ground Ground Ground Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved...
  • Page 36 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved...
  • Page 37 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved for future use Reserved for future use. Not connected...
  • Page 38 Unless otherwise specified, RESERVED pins must be left unconnected (Floating). NOTE: The following pins are unique for the LE910Cx and may not be supported on other (former or future) xE910 family. Special care must be taken when designing the application board if future...

  • Page 39: Le910Cx - Signals That Must Be Connected

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 3.2. LE910Cx - Signals That Must Be Connected Table 6 specifies the LE910Cx signals that must be connected even if not used by end application: Table 6: Mandatory Signals Signal Notes VBATT &...
  • Page 40 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Signal Notes ANT_GPS GPS antenna C4, C5, C6, C7, D3, E3, G3, K4, L4, P11 Reserved Connect to a Test Point for Telit internal GPIO_09 If not used, connect to a Test Point...

  • Page 41: Lga Pads Layout

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 3.3. LGA Pads Layout Figure 2: LGA Pads Layout Reproduction forbidden without written authorization by Telit Communications S.p.A. - All Rights Reserved Telit Confidential Information, provided under NDA Page 41 of 117...

  • Page 42: Backward Compatibility To Xe910 Family

    To support the extra features and additional interfaces, the LE910Cx introduces more pins compared to the xE910. The extra pins of the LE910Cx can be considered as optional if not needed and can be left unconnected (floating) if not used.

  • Page 43: Electrical Specifications

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 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 Unit...

  • Page 44: Logic Level Specifications

    NOTE: Do not connect LE910Cx’s digital logic signal directly to OEM’s digital logic signal with a level higher than 2.7V for 1.8V CMOS signals. 4.3.1.

  • Page 45: 1.8V Sd Card Pads

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Parameter Unit Comment Pull-down resistance [kΩ] Input capacitance [pF] 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...

  • Page 46: Dual Voltage Pads - Absolute Maximum Ratings

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Parameter Unit Comment Output low level 0.4V Low-level input leakage current [uA] No pull-up High-level input leakage current [uA] No pull-down Pull-up resistance [kΩ] Pull-down resistance [kΩ] Input capacitance [pF] 4.3.5.

  • Page 47: Sim Card Pads @2.95V

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Parameter Unit Comments Pull-down resistance [kΩ] Input capacitance [pF] 4.3.7. SIM Card Pads @2.95V Table 15: Operating Range – For SIM Pads Operating at 2.95V Parameter Unit Comment Input high level 2.1V...

  • Page 48: 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;...

  • Page 49: Figure 5: Le910Cx Initialization And Activation

    AT commands. NOTE: During SW initialization of the LE910Cx, the SW configures all pads and interfaces to their desired mode. When PWRMON goes high, this indicates that the initialization of all I/O pads is completed.

  • Page 50: Turning Off The Le910Cx Module

    Shutdown by Software Command The LE910Cx module can be shut down by a software command. When a shutdown command is sent, LE910Cx goes into the Finalization state and at the end of the finalization process shuts down PWRMON. The duration of the finalization state can differ according to the current situation of the module, so a value cannot be defined.

  • Page 51: Hardware Shutdown

    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.

  • Page 52: Unconditional Hardware Shutdown

    1VV0301298 Rev. 1.05 - 2017-06-18 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. A simple circuit for applying unconditional shutdown is shown below:...

  • Page 53: Power Supply

    3.8V Supply voltage range 3.4V – 4.2V Max ripple on module input supply 30mV Table 17 provides typical current consumption values of LE910Cx for various operation modes. Table 17: LE910Cx Current Consumption Mode Average [Typical] Mode Description 1) Switched Off Switched off 25µA...
  • Page 54 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Mode Average [Typical] Mode Description 3) Operative Mode (LTE) 180mA LTE CAT 1channel BW 5 MHz, RB=1, Tx = 0 dBm LTE (0 dBm) (Test case: BAND 1, Channel 300) 190mA...

  • Page 55: General Design Rules

    Make sure that the low ESR capacitor on the power supply output (usually a tantalum one) is rated at least 10V. • A protection diode must be inserted close to the power input to protect the LE910Cx module from power polarity inversion. Reproduction forbidden without written authorization by Telit Communications S.p.A. - All Rights Reserved...
  • Page 56 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Reproduction forbidden without written authorization by Telit Communications S.p.A. - All Rights Reserved Telit Confidential Information, provided under NDA Page 56 of 117...

  • Page 57: Input Source Power Supply - Design Guidelines

    • A protection diode must be inserted close to the power input to protect the LE910Cx module from power polarity inversion. This can be the same diode as for spike protection. Reproduction forbidden without written authorization by Telit Communications S.p.A. - All Rights Reserved...

  • Page 58: Figure 11: Example Of Switching Regulator With 12V Input - Part 1

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 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.

  • Page 59: Battery Source Power Supply - Design Guidelines

    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. Use only Li-Ion battery types. • A bypass low ESR capacitor of adequate capacity must be provided to cut the current absorption peaks;...

  • Page 60: Thermal Design Guidelines

    Active Call or Data session. For the heat generated by the LE910Cx module, consider it to be 2W max during transmission at Class12 GPRS upload. The generated heat is mostly conducted to the ground plane under the LE910Cx module.

  • Page 61: Power Supply Pcb Layout Guidelines

    PCB trace from the capacitor to LE910Cx is wide enough to ensure a drop-less connection even during the 2A current peaks.

  • Page 62: Antenna(S)

    LE910Cx antenna pad (K1) by a transmission line implemented on the PCB. If the antenna is not directly connected to the antenna pad of the LE910Cx, a PCB line is required to connect to it or to its connector.

  • Page 63: Gsm/Wcdma/Lte Antenna - Pcb Line Guidelines

    End-Users must be provided with transmitter operation conditions for satisfying RF exposure compliance. OEM integrators must ensure that the end user has no manual instructions to remove or install the LE910Cx module. Antennas used for this OEM module must not exceed 3dBi gain for mobile and fixed operating configurations.

  • Page 64: Gsm/Wcdma/Lte Antenna - Installation Guidelines

    LE910Cx diversity antenna pad (F1) by means of a transmission line implemented on the PCB. If the antenna is not directly connected at the antenna pad of the LE910Cx, a PCB line is required to connect to it or to its connector.

  • Page 65: Gnss Antenna Requirements

    Since there is no antenna connector on the LE910Cx module, the antenna must be connected to the LE910Cx through the PCB to the antenna pad. If the antenna is not directly connected at the antenna pad of the LE910Cx, a PCB line is required. This line of transmission must meet the following requirements: Reproduction forbidden without written authorization by Telit Communications S.p.A.

  • Page 66: Gnss Antenna - Pcb Line Guidelines

    Ground planes; or shield it with a metal frame cover. • If you do not have EM-noisy devices around the PCB of LE910Cx, use a Micro strip line on the surface copper layer for the antenna line. The line attenuation will be lower than a buried one.

  • Page 67: Gnss Antenna - Installation Guidelines

    1VV0301298 Rev. 1.05 - 2017-06-18 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.) •...

  • Page 68: Hardware Interfaces

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 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 SD/MMC x1 dual voltage interface for supporting SD/MMC card SDIO For WIFI support (1.8V only)

  • Page 69: Usb Port

    NOTE: USB_VBUS input power is internally used to detect the USB port and start the enumeration process. It is not used for supplying power to the internal LE910Cx USB HW block. Therefore, only a maximum of 5 mA is required.

  • Page 70: Hsic Interface

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 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. • High-speed 480 Mbps (240 MHz DDR) USB transfers are 100% host driver compatible with traditional USB cable connected topologies •...

  • Page 71: Serial Ports

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 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) •...

  • Page 72: Modem Serial Port 1 Signals

    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.

  • Page 73: Modem Serial Port 2

    NOTE: According to V.24, Rx/Tx signal names refer to the application side; therefore, on the LE910Cx side, these signal are in the opposite direction: TXD on the application side will be connected to the receive line (here named TXD/ RX_UART) of the LE910Cx serial port and vice versa for Rx.

  • Page 74: Rs232 Level Translation

    1VV0301298 Rev. 1.05 - 2017-06-18 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 •...

  • Page 75: Figure 14: Rs232 Serial Port Lines Connection Layout

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 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.

  • Page 76: Peripheral Ports

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 8.5. Peripheral Ports In addition to the LE910Cx serial ports, the LE910Cx supports the following peripheral ports: • SPI – Serial Peripheral Interface • I2C - Inter-integrated circuit • SD/MMC Card Interface •...

  • Page 77: I2C - Inter-Integrated Circuit

    SW emulated I2C available on GPIO’s 1-10. 8.5.3. SD/MMC Card Interface The LE910Cx provides an SD port supporting the SD3.0 specification, which can be used to support standard SD/MMC memory cards with the following features: • Interface with SD/MMC memory cards up to 2 TB •...

  • Page 78: Table 27: Sd Card Signals

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Table 28 lists the LE910Cx SD card signals. Table 28: SD Card Signals Signal Function Type Comments SD/MMC_CMD SD command 1.8/2.95V SD/MMC_CLK SD card clock 1.8/2.95V SD/MMC_DATA0 SD Serial Data 0 1.8/2.95V...

  • Page 79: Wifi Sdio Interface

    The LE910Cx module includes an integrated SW driver for supporting the Qualcomm QCA6574 chipset The LE910Cx SDIO port supports the SDIO 3.0 specification at 1.8V CMOS only, thus cannot be used as an external SD/MMC card connection. The LE910Cx module supports an LTE/WiFi coexistence mechanism via the WCI (Wireless Coexistence Interface) port, which connects between the module and the external WiFi IC.
  • Page 80 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 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. - All Rights Reserved...

  • Page 81: Audio Interface

    Sample rates of 8 kHz and 16 kHz In addition to the DVI port, the LE910Cx module provides a master clock signal (REF_CLK on Pin B12) which can either provide a reference clock to an external codec or form an I2S interface together with the DVI port where the REF_CLK acts as the I2S_MCLK.

  • Page 82: Short Frame Timing Diagrams

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 8.6.1.1. Short Frame Timing Diagrams Figure 17: Primary PCM Timing Reproduction forbidden without written authorization by Telit Communications S.p.A. - All Rights Reserved Telit Confidential Information, provided under NDA Page 82 of 117...

  • Page 83: Table 30: Pcm_Codec Timing Parameters

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Table 31: PCM_CODEC Timing Parameters Reproduction forbidden without written authorization by Telit Communications S.p.A. - All Rights Reserved Telit Confidential Information, provided under NDA Page 83 of 117...

  • Page 84: Long Frame Timing Diagrams

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 8.6.1.2. Long Frame Timing Diagrams Figure 18: Auxiliary PCM Timing Reproduction forbidden without written authorization by Telit Communications S.p.A. - All Rights Reserved Telit Confidential Information, provided under NDA Page 84 of 117...

  • Page 85: Table 31: Aux_Pcm_Codec Timing Parameters

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Table 32: AUX_PCM_CODEC Timing Parameters Reproduction forbidden without written authorization by Telit Communications S.p.A. - All Rights Reserved Telit Confidential Information, provided under NDA Page 85 of 117...

  • Page 86: General Purpose I/O

    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. An alternate function pad is internally controlled by LE910Cx firmware and acts depending on the implemented function.
  • Page 87 OFF or during an ON/OFF transition. NOTE: LE910Cx GPIO 1~10 can also be used as alternate I2C function. Refer to Section Reproduction forbidden without written authorization by Telit Communications S.p.A. - All Rights Reserved...

  • Page 88: Using A Gpio Pad As Input

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 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.

  • Page 89: Figure 19: Gpio Output Pad Equivalent Circuit

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Figure 19: GPIO Output Pad Equivalent Circuit Reproduction forbidden without written authorization by Telit Communications S.p.A. - All Rights Reserved Telit Confidential Information, provided under NDA Page 89 of 117...

  • Page 90: Miscellaneous Functions

    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. The STAT_LED functionality is available on GPIO_01...

  • Page 91: Indication Of Software Ready

    The SW_RDY signal provides indication about the ability of the module to receive commands As long as the SW_RDY is asserted low it indicates that the LE910Cx has not yet finished booting Once the SW_RDY is asserted high, it indicates that the LE910Cx is ready to receive commands...

  • Page 92: Adc Converter

    ADC Converter 9.5.1. 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.

  • Page 93: Gnss Characteristics

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 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 Parameters Notes Measurement Standalone or MS Based -162.3 dBm...

  • Page 94: Mounting The Module On Your Board

    1VV0301298 Rev. 1.05 - 2017-06-18 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.

  • Page 95: Figure 22: Le910Cx Mechanical Dimensions (Top View)

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Figure 22: LE910Cx Mechanical Dimensions (Top view) Reproduction forbidden without written authorization by Telit Communications S.p.A. - All Rights Reserved Telit Confidential Information, provided under NDA Page 95 of 117...

  • Page 96: Figure 23: Le910Cx Mechanical Dimensions (Side View)

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Figure 23: LE910Cx Mechanical Dimensions (Side view) Reproduction forbidden without written authorization by Telit Communications S.p.A. - All Rights Reserved Telit Confidential Information, provided under NDA Page 96 of 117...

  • Page 97: Recommended Footprint For The Application

    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.

  • Page 98: Stencil

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 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.

  • Page 99: Recommendations For Pcb Pad Dimensions (Mm)

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 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.

  • Page 100: Solder Paste

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 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.

  • Page 101: Table 38: Solder Profile Characteristics

    All temperatures refer to topside of the package, measured on the package body surface. Warning: The LE910Cx module withstands one reflow process only. Reproduction forbidden without written authorization by Telit Communications S.p.A. - All Rights Reserved Telit Confidential Information, provided under NDA...

  • Page 102: Application Guide

    Application Guide 11.1. Debug of the LE910Cx Module in Production To test and debug the mounting of the LE910Cx module, we strongly recommend to add several test pads on the host PCB for the following purposes: • Checking the connection between the LE910Cx itself and the application •...

  • Page 103: Bypass Capacitor On Power Supplies

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 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.

  • Page 104: Sim Interface

    The LE910Cx module contains an internal pull-up resistor of 20K Ω on SIMIO. However, the un-mounted option in the application design can be recommended to tune R1 if necessary. Table 40 lists the values of C1 to be adopted with the LE910Cx product: Table 40: SIM Interface – C1 Range Product P/N...

  • Page 105: Emc Recommendations

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 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. Table 41: EMC Recommendations Signal...

  • Page 106: Download And Debug Port

    USB interface only Users who use a USB interface only to communicate with the LE910Cx module must arrange for a USB port in the host system to debug or upgrade the LE910Cx when it is mounted. • UART interface only Users who use a UART interface only to communicate with the LE910Cx module must arrange for a UART port in the host system to debug or upgrade the LE910Cx when it is mounted.

  • Page 107: Packing System

    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. - All Rights Reserved...

  • Page 108: Figure 30: Tray Drawing

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Figure 30: Tray Drawing Reproduction forbidden without written authorization by Telit Communications S.p.A. - All Rights Reserved Telit Confidential Information, provided under NDA Page 108 of 117...

  • Page 109: Tape & Reel

    1VV0301298 Rev. 1.05 - 2017-06-18 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.

  • Page 110: Figure 33: Reel Detail

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Figure 33: Reel Detail Reproduction forbidden without written authorization by Telit Communications S.p.A. - All Rights Reserved Telit Confidential Information, provided under NDA Page 110 of 117...

  • Page 111: Moisture Sensitivity

    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. - All Rights Reserved...

  • Page 112: Safety Recommendations

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 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: •...

  • Page 113: Conformity Assessment Issues

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 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.
  • Page 114 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Frequency Band Freq [MHz] LE910C1 NA Gain LE910C1 NS Gain [dBi] [dBi] 850 MHZ 0.63 6.08 1900 MHZ 1900 2.51 8.01 1700 MHZ 1700 5.00 5.00 900 MHZ 5.00 700 MHZ 5.63...
  • Page 115 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 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. En l'absence d'étiquette, l'appareil hôte doit porter une étiquette donnant le FCC ID et le IC du module, précédé...

  • Page 116: Document History

    LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Document History Table 42: Document Revision History Revision Date Changes 2016-08-30 First Draft 2016-09-05 Minor edits 2016-11-13 Added information for GPIO usage as Interrupt Added clarification for AUX_UART location and backward...
  • Page 117 LE910Cx Hardware User Guide 1VV0301298 Rev. 1.05 - 2017-06-18 Revision Date Changes 1.01 2017-02-16 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...

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