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Teli LE910C1-NA Design Manual

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LE910Cx
HW Design Guide
1VV0301298 Rev. 33 – 2021-06-29
Telit Technical Documentation

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Summary of Contents for Teli LE910C1-NA

  • Page 1 LE910Cx HW Design Guide 1VV0301298 Rev. 33 – 2021-06-29 Telit Technical Documentation...

  • Page 2: Applicability Table

    LE910Cx HW User Guide APPLICABILITY TABLE This documentation applies to the following products: PRODUCTS DESCRIPTION LE910C1-NA North America – AT&T with global roaming LE910C1-NS North America - Sprint variant LE910C1-AP APAC variant CAT1 variant LE910C4-AP APAC variant CAT4 variant LE910C4-EU...

  • Page 3: Table Of Contents

    LE910Cx HW User Guide CONTENTS APPLICABILITY TABLE CONTENTS INTRODUCTION Scope Audience Contact Information, Support Symbol Conventions Related Documents GENERAL PRODUCT DESCRIPTION Overview Applications General Functionality and Main Features Block Diagram Environmental Requirements 2.5.1. Temperature Range 2.5.2. RoHS Compliance Operating Frequency Bands 2.6.1.
  • Page 4 LE910Cx HW User Guide Absolute Maximum Ratings – Not Operational Recommended Operating Conditions Logic Level Specifications 4.3.1. 1.8V Pads - Absolute Maximum Ratings 4.3.2. 1.8V Standard GPIOs 4.3.3. 1.8V SD Card Pads 4.3.4. 1.8V SIM Card Pads 4.3.5. Dual Voltage Pads - Absolute Maximum Ratings 4.3.6.
  • Page 5 LE910Cx HW User Guide GSM/WCDMA/TD-SCDMA/LTE Antenna – PCB Line Guidelines 61 GSM/WCDMA/LTE Antenna – Installation Guidelines Antenna Diversity Requirements GNSS Antenna Requirements 7.5.1. Combined GNSS Antenna 7.5.2. Linear and Patch GNSS Antenna 7.5.3. Front End Design Considerations 7.5.4. GNSS Antenna – PCB Line Guidelines 7.5.5.
  • Page 6 LE910Cx HW User Guide Indication of Software Ready RTC – Real Time Clock VAUX Power Output ADC Converter 9.5.1. Description 9.5.2. Using the ADC Converter Using the Temperature Monitor Function GNSS Characteristics MOUNTING THE MODULE ON YOUR BOARD General Finishing & Dimensions Recommended Footprint for the Application Stencil PCB Pad Design...
  • Page 7 LE910Cx HW User Guide FCC/ISED Regulatory Notices JTBL Regulatory Notices NCC Regulatory Notices ANATEL Regulatory Notices PRODUCT AND SAFETY INFORMATION Copyrights and Other Notices 14.1.1. Copyrights 14.1.2. Computer Software Copyrights Usage and Disclosure Restrictions 14.2.1. License Agreements 14.2.2. Copyrighted Materials 14.2.3.

  • Page 8: Introduction

    LE910Cx HW User Guide 1. INTRODUCTION Scope This document introduces the Telit LE910Cx module and presents possible and recommended hardware solutions for the development of a product based on this module. All the features and solutions described in this document are applicable to all LE910Cx variants listed in the applicability table.

  • Page 9: Symbol Conventions

    LE910Cx HW User Guide Alternatively, use: https://www.telit.com/support For detailed information about where you can buy the Telit modules or for recommendations on accessories and components visit: https://www.telit.com To register for product news and announcements or for product questions contact Telit’s Technical Support Center (TTSC).
  • Page 10 LE910Cx HW User Guide • LE910Cx Interface Board HW User Guide 1VV0301323 • LE910/LE920 Digital Voice Interface Application Note 80000NT11246A • Telit_LE920A4_LE910Cx_Wi-Fi_Interface_Application_Note_r1 80490NT11511A • Antenna Detection Application Note 80000NT10002A • High-Speed Inter-Chip USB Electrical Specification, version 1.0 (a supplement to the USB 2.0 specification, Section 3.8.2) •...

  • Page 11: General Product Description

    LE910Cx HW User Guide 2. GENERAL PRODUCT DESCRIPTION Overview LE910Cx is Telit’s new LTE series for IoT applications. In its most basic use case, the 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 12: Applications

    LE910Cx HW User Guide The information presented in this document is believed to be accurate and reliable. However, no responsibility is assumed by Telit Communications S.p.A. for its use, nor any infringement of patents or other rights of third parties which may result from its use. No license is granted implicitly or in any other way under any patent rights of Telit Communications S.p.A.
  • Page 13 LE910Cx HW User Guide Function Features Application processor Application processor to run customer application code 32-bit ARM Cortex-A7 up to 1.3 GHz running the Linux operating system Flash + DDR are large enough to allow for customer’s own software applications Interfaces Rich set of interfaces, including: SD/MMC Card Interface supporting SD3.0 standard...

  • Page 14: Block Diagram

    LE910Cx HW User Guide Note: The following interfaces are unique to the LE910Cx and may not be supported on other (former or future) xE910 family. Special care must be paid when designing the application board if future compatibility is required: - SGMII for Ethernet connectivity - SDIO for WIFI connectivity - SD/MMC for SD Card connectivity...
  • Page 15 LE910Cx HW User Guide • Application processor, Modem subsystem and Location processing with their external interfaces. These three functions are contained in a single SOC. • RF front end and antenna ports. • Digital Audio interface for external codec. • Rich IO interfaces.

  • Page 16: Environmental Requirements

    LE910Cx HW User Guide Environmental Requirements 2.5.1. Temperature Range Mode Temperature Note Operating temperature range -40 ~ +85°C Ambient. Ambient Temperatures outside of the range –20°C ÷ +55°C might slightly deviate from ETSI specifications. The module is fully functional, able to make and receive voice calls, data calls, SMS and GPRS traffic.

  • Page 17: Reference Table Of Rf Bands Characteristics

    LE910Cx HW User Guide Region Variant HSPA+ LTE FDD SCDMA LE910C1-NA 2, 3, 5, 8 1, 2, 4, 5, 8 2, 4, 12 LE910C1-NS 2, 4, 5, 12, 25, 26 LE910C1-AP 1, 5, 6, 8, 19 1, 3, 5, 8, 9, 18, 19, 26, 28...
  • Page 18 LE910Cx HW User Guide Mode Freq. Tx (MHz) Freq. Rx (MHz) Channels Tx-Rx Offset 880 ~ 890 925 ~ 935 975 ~ 1023 45 MHz Tx: 9612 ~ 9888 WCDMA 2100 – B1 1920 ~ 1980 2110 ~ 2170 190 MHz Rx: 10562 ~ 10838 Tx: 9262 ~ 9538 WCDMA 1900 –...
  • Page 19 LE910Cx HW User Guide Mode Freq. Tx (MHz) Freq. Rx (MHz) Channels Tx-Rx Offset Tx: 22150 ~ 22749 LTE AWS+ – B10 1710 ~ 1770 2110 ~ 2170 400 MHz Rx: 4150 ~ 4749 Tx: 23010 ~ 23179 LTE 700a – B12 699 ~ 716 729 ~ 746 30 MHz...

  • Page 20: Rf Parameters

    LE910Cx HW User Guide RF Parameters 2.7.1. Sensitivity Typical sensitivity levels are as follows: Mode Primary Diversity SIMO 3GPP PCS 1900 -107.5 -102 DCS 1800 -107.0 -102 GSM 850 -102 -108.5 EGSM 900 -102 -107.5 WCDMA 2100 – B1 -109.0 -110.0 -111.5 -106.7...

  • Page 21: Output Power

    LE910Cx HW User Guide Mode Primary Diversity SIMO 3GPP LTE 700PS – B14 -98.0 -99.5 -100.5 -93.3 LTE 700b – B18 -99.0 -100.0 -101.5 -96.3 LTE 800 – B19 -99.0 -99.5 -101.5 -96.3 LTE 800 – B20 -99.0 -99.0 -101.5 -93.3 LTE 1900+ –...

  • Page 22: Mechanical Specifications

    LE910Cx HW User Guide Mechanical Specifications 2.8.1. Dimensions The module’s overall dimensions are: • Length: 28.2 mm, +/- 0.15 mm tolerance • Width: 28.2 mm, +/- 0.15 mm tolerance • Thickness: 2.2 mm, +/- 0.15 mm tolerance and The LE910Cx-WWX module’s overall dimensions are: •...

  • Page 23: Module Connections

    LE910Cx HW User Guide 3. MODULE CONNECTIONS Pin-out Signal Function Type Comment USB HS 2.0 Communication Port USB_D+ USB differential Data (+) USB_D- USB differential Data (-) Power sense for the internal USB USB_VBUS Power transceiver USB_ID USB ID See note below Asynchronous UART C103/TXD Serial data input (TXD) from DTE...
  • Page 24 LE910Cx HW User Guide Signal Function Type Comment SD/MMC_DATA2 SD Serial Data 2 1.8/2.95V SD/MMC_DATA3 SD Serial Data 3 1.8/2.95V SD/MMC_CD SD card detect input 1.8V Active Low Power supply for MMC card pull-up VMMC 1.8/2.95V resistors WiFi (SDIO) Interface WiFi_SD_CMD Wi-Fi SD Command 1.8V...
  • Page 25 LE910Cx HW User Guide Signal Function Type Comment External SIM 2 signal – Power SIMVCC2 1.8/2.85V supply for SIM 2 Digital Voice Interface (DVI) Digital Voice interface (WAO DVI_WAO 1.8V master output) DVI_RX Digital Voice interface (Rx) 1.8V DVI_TX Digital Voice interface (Tx) 1.8V Digital Voice interface (CLK master DVI_CLK...
  • Page 26 LE910Cx HW User Guide Signal Function Type Comment Enables the external regulator for GPS_LNA_EN 1.8V GPS LNA GPS sync signal for Dead GPS_SYNC 1.8V Reckoning Miscellaneous Functions ON_OFF_N Power ON / Power OFF input Active low HW_SHUTDOWN_N Unconditional Shutdown input Active low Supply output for external VAUX/PWRMON...
  • Page 27 LE910Cx HW User Guide Signal Function Type Comment VBATT_PA Main Power Supply (RF Section) Power VBATT_PA Main Power Supply (RF Section) Power Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground...
  • Page 28 LE910Cx HW User Guide Signal Function Type Comment Ground Ground Ground Ground Ground Ground Ground 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...
  • Page 29 LE910Cx HW User Guide Signal Function Type Comment 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 Reserved Reserved Reserved Reserved...
  • Page 30 LE910Cx HW User Guide Signal Function Type Comment Reserved Reserved Reserved for future use Reserved for future use. Not Can be tied to connected internally Table 7: Pin-out Note: When the UART signals are used as the communication port between the host and the modem, the RTS must be connected to GND (on the module side) if flow control is not used.

  • Page 31: Signals That Must Be Connected

    LE910Cx HW User Guide Signals That Must Be Connected Table 8 lists the LE910Cx signals that must be connected even if not used by the end application: Signal Notes VBATT & M1, M2, N1, N2, P1, P2 VBATT_PA A2, B13, D4, E1, E2, E14, F2, G1, G2, G7, G8, G9, H1, H2, H7, H8, H9, J1, J2, J7, J8, J9, K2, L1, L2, M3, M4, M12, N3,...

  • Page 32: Lga Pads Layout

    LE910Cx HW User Guide LGA Pads Layout Figure 2: LGA Pads Layout Backward Compatibility to xE910 Family The LE910Cx is a new series in the xE910 form factor The LE910Cx is fully backward compatible with the previous xE910 in terms of: •...
  • Page 33 LE910Cx HW User Guide In this case, the new LE910Cx can be safely mounted on existing carrier boards designed for the previous xE910. The additional pins of the LE910Cx are shown in Figure 3 (marked Green) Figure 3: LE910Cx vs. LE910 Pin-out Comparison (top view) 1VV0301298 Rev.

  • Page 34: Electrical Specifications

    LE910Cx HW User Guide 4. ELECTRICAL SPECIFICATIONS Absolute Maximum Ratings – Not Operational Warning: A deviation from the value ranges listed below may harm the LE910Cx module. Symbol Parameter Unit VBATT Battery supply -0.5 +6.0 voltage on pin VBATT VBATT TRANSIENT Transient voltage on -0.5 +7.0...

  • Page 35: Logic Level Specifications

    LE910Cx HW User Guide Logic Level Specifications Unless otherwise specified, all LE910Cx interface circuits are 1.8V CMOS logic. Only few specific interfaces (such as MAC, USIM and SD Card) are capable of dual voltage I/O. The following tables show the specifications of the logic level used in the LE910Cx interface circuits.

  • Page 36: Sd Card Pads

    LE910Cx HW User Guide Note: Pull-Up and Pull-Down resistance of GPIO3, GPIO7 and GPIO8 is different from the one mentioned above. GPIO3 pull resistance is specified as 10KΩ to 50KΩ 4.3.3. 1.8V SD Card Pads Parameter Unit Comment Input high level 1.27V Input low level -0.3V...

  • Page 37: Dual Voltage Pads - Absolute Maximum Ratings

    LE910Cx HW User Guide Parameter Unit Comment Pull-down [kΩ] resistance Input [pF] capacitance Table 14: Operating Range – SIM Pads Working at 1.8V 4.3.5. Dual Voltage Pads - Absolute Maximum Ratings Parameter Input level on any digital pin when on -0.3V +3.6V Input voltage on analog pins when on...
  • Page 38 LE910Cx HW User Guide Parameter Unit Comment Output high 2.25V 3.1V level Output low level 0.4V Low-level input [uA] No pull-up leakage current High-level input [uA] No pull-down leakage current Pull-up [kΩ] resistance Pull-down [kΩ] resistance Input [pF] capacitance Table 17: Operating Range – For SIM Pads Operating at 2.95V 1VV0301298 Rev.

  • Page 39: Hardware Commands

    LE910Cx HW User Guide 5. HARDWARE COMMANDS Turning on the LE910Cx Module To turn on the LE910Cx module, the ON_OFF_N 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 pulled up internally;...
  • Page 40 LE910Cx HW User Guide Note: During the Initialization state, the AT commands are not available. The DTE host must wait for the Activation state before communicating with the LE910Cx Figure 5: LE910Cx Initialization and Activation A flow chart showing the proper turn on procedure is displayed below: 1VV0301298 Rev.
  • Page 41 LE910Cx HW User Guide Figure 6: Turn-on Procedure Timing of VAUX/PWRMON and SW_RDY Models ON ↔ VAUX/PWRMON ON ↔ SW_RDY LE910C1-NA LE910C4-NS LE910C1-AP LE910C4-AP LE910C1-EU LE910C4-EU Typ. 21 sec Typ. 28 Sec LE910C1-NF LE910C4-NF LE910C1-LA LE910C4-LA LE910C4-CN 1VV0301298 Rev. 33...
  • Page 42 LE910Cx HW User Guide Models ON ↔ VAUX/PWRMON ON ↔ SW_RDY LE910C1-SA LE910C1-ST Typ. 13 Sec Typ. 16 Sec LE910C1-SV LE910C1-EUX LE910C1-SAX Typ. 10 Sec Typ. 20 Sec LE910C1-SVX Table 18: Timing of VAUX/PWRMON and SW_RDY Note: SW_RDY signal is available on GPIO_08 (by default GPIO_08 functions as SW_RDY) Note: To check whether the LE910Cx has completely powered on, monitor the SW_RDY hardware line.
  • Page 43 LE910Cx HW User Guide In this case, the module will start power on sequence immediately after VBATT supply is applied Note: Active low signals are labeled with a name that ends with "#" or with “_N” Note: To avoid a back-powering effect, it is recommended to prevent any HIGH logic level signal from being applied to the module’s digital pins when it is powered OFF or during an ON/OFF transition.

  • Page 44: Turning Off The Le910Cx Module

    LE910Cx HW User Guide Turning off the LE910Cx Module Turning off the device can be done in the following different ways: • Shutdown by software using the AT#SHDN software command • Hardware shutdown using ON_OFF_N pad • Hardware Unconditional Shutdown using the SHDN_N pad When the device is shut down by a software command or hardware shutdown, it issues a detach request to the network, informing the network that the device will no longer be reachable.

  • Page 45: Hardware Shutdown

    LE910Cx HW User Guide Figure 8: Shutdown by Software Command Note: To check whether the device has powered off, monitor the PWRMON/SW_RDY hardware line. When PWRMON/SW_RDY goes low, the device has powered off. 5.3.2. Hardware Shutdown To turn off the LE910Cx module, the ON_OFF_N pad must be asserted low for at least 2.5 seconds and then released.

  • Page 46: Unconditional Hardware Shutdown

    LE910Cx HW User Guide Note: To check whether the device has powered off, monitor the PWRMON/SW_RDY hardware line. When PWRMON/SW_RDY or goes low, the device has powered off. 5.3.3. 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.

  • Page 47: Powering Off The Module

    LE910Cx HW User Guide Note: Do not use any pull-up resistor on the HW_SHUTDOWN_N line or any totem pole digital output. Using a pull-up resistor may cause latch-up problems on the LE910Cx power regulator and improper functioning of the module. The HW_SHUTDOWN_N line must be connected only in an open-collector configuration.

  • Page 48: Fast Shut Down By Hardware

    LE910Cx HW User Guide Note: Refer to LE910Cx series AT command reference guide (Fast power down - #FASTSHDN) in order to set up detailed AT command. 5.5.1. Fast Shut Down by Hardware The Fast Shut Down is triggered by a GPIO. Customers wishing to implement the Fast Shut Down should configure a GPIO as the trigger pin for the Fast Shut Down through AT command.
  • Page 49 LE910Cx HW User Guide Figure 13: Example of Timing diagram for Fast Shut Down The most important thing is that a system should give enough energy. The LE910Cx turns off safely for 30ms after the Fast Shut Down is triggered. Otherwise, unwanted memory corruption may occur.

  • Page 50: Fast Shut Down By Software

    LE910Cx HW User Guide Warning: associated with low ESR requires current limiting feature tank in the DCDC converter to avoid inrush current side effects. 5.5.2. Fast Shut Down by Software The Fast Power Down can be triggered directly by the AT command. 1VV0301298 Rev.

  • Page 51: Power Supply

    LE910Cx HW User Guide 6. POWER SUPPLY The power supply circuitry and board layout are very important parts of the full product design, with a critical impact on the overall performance of the product. Please read the following requirements and guidelines carefully to ensure a good and proper design. Power Supply Requirements The LE910Cx power requirements are as follows: Power Supply...
  • Page 52 LE910Cx HW User Guide Mode Average (Typ.) Mode Description 1.6mA Paging cycle #256 frames (2.56 sec DRx cycle) Single Variant / ThreadX 1.7mA Paging cycle #128 frames (1.28 sec DRx cycle) AT+CFUN=5 1.4mA Paging cycle #256 frames (2.56 sec DRx cycle) Operative Mode (LTE) LTE CAT 1/CAT 4 channel BW 10 MHz, RB=12, Tx = Max 860mA...

  • Page 53: General Design Rules

    LE910Cx HW User Guide * The above currents in idle are measured when Status LED, which is controlled by AT#SLED, is turned off. See the AT Command User Guide for details about the AT#SLED section. Note: The current consumption of CFUN=0 mode could be 300uA higher than CFUN=5 mode to support the wake-up by RTS pin.

  • Page 54: Electrical Design Guidelines

    LE910Cx HW User Guide 6.3.1. Electrical Design Guidelines The electrical design of the power supply strongly depends on the power source where this power is drained. Power sources can be divided into three categories: • +5V input (typically PC internal regulator output) •...

  • Page 55: Input Source Power Supply - Design Guidelines

    LE910Cx HW User Guide 6.3.1.2. + 12V Input Source Power Supply – Design Guidelines • The desired output for the power supply is 3.8V. Due to the huge difference between the input source and the desired output, a linear regulator is unsuitable and must not be used.

  • Page 56: Battery Source Power Supply - Design Guidelines

    LE910Cx HW User Guide Figure 16: Example of Switching Regulator with 12V Input – Part 2 6.3.1.3. 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 suitable for supplying the power to the LE910Cx module.
  • Page 57 LE910Cx HW User Guide • Average GPS current consumption during GPS tracking (LTE @ idle): mA (40mA). Note: The average consumption during transmission depends on the power level at which the device is requested to transmit via the network. Therefore, the average current consumption varies significantly.

  • Page 58: Power Supply Pcb Layout Guidelines

    LE910Cx HW User Guide 6.3.3. Power Supply PCB Layout Guidelines As seen on the guidelines for electrical design, 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.
  • Page 59 LE910Cx HW User Guide • The power supply input cables must be kept separate from noise sensitive lines, such as microphone/earphone cables. 1VV0301298 Rev. 33 Page 59 of 128 2021-06-29 Not Subject to NDA...

  • Page 60: Antenna(S)

    LE910Cx HW User Guide 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 overall performance of the product. Read carefully and follow the requirements and guidelines for a good and proper design.

  • Page 61: Gsm/Wcdma/Td-Scdma/Lte Antenna - Pcb Line Guidelines

    LE910Cx HW User Guide Furthermore, if the device is developed for the US and/or Canadian market, it must comply with FCC and/or IC approval requirements: 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 people and must not be co-located or operating in conjunction with any other antennas or transmitter.

  • Page 62: Gsm/Wcdma/Lte Antenna - Installation Guidelines

    LE910Cx HW User Guide • If EM-noisy devices are present on the PCB hosting the LE910Cx, such as fast switching ICs, take care to shield them with a metal frame cover. • 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 if compared to a Strip line of the same length.

  • Page 63: Gnss Antenna Requirements

    LE910Cx HW User Guide Note: If Rx Diversity is not used/connected, perfectly disable the Diversity functionality using the AT#RXDIV command (refer to Ref 1: LE920x4/LE910Cx AT Command User Guide) and connect the Diversity pad F1 to a 50 Ohm termination or floating GNSS Antenna Requirements LE910Cx supports an active antenna.

  • Page 64: Combined Gnss Antenna

    LE910Cx HW User Guide Note: It is recommended to add PI matching network near the GPS connector on the application board in case that RF matching is needed. 7.5.1. Combined GNSS Antenna The use of a combined RF/GNSS antenna is NOT recommended. This solution can generate extremely poor GNSS reception.

  • Page 65: Gnss Antenna - Pcb Line Guidelines

    LE910Cx HW User Guide 7.5.4. GNSS Antenna – PCB Line Guidelines • Ensure that the antenna line impedance is 50 Ohm. • Keep the line on the PCB as short as possible to reduce the loss. • The antenna line must have uniform characteristics, constant cross section, avoiding meanders and abrupt curves.

  • Page 66: Hardware Interfaces

    LE910Cx HW User Guide 8. HARDWARE INTERFACES Table 25 summarizes all the hardware interfaces of the LE910Cx module. Interface LE910Cx SGMII For Ethernet support HSIC x1 (Optional) x1 dual voltage interface for supporting SD/MMC card SD/MMC SDIO For WIFI support (1.8V only) USB2.0, OTG support on LE910C1-LA, LE910C4-LA and LE910C4-CN Master only, up to 50 MHz...
  • Page 67 LE910Cx HW User Guide Table 26 lists the USB interface signals. Signal Pad No. Usage USB_VBUS Power and cable detection for the internal USB transceiver. Acceptable input voltage range 2.5V – 5.5V @ max 5 mA consumption USB_D- Minus (-) line of the differential, bi- directional USB signal to/from the peripheral device USB_D+...

  • Page 68: Hsic Interface (Optional)

    LE910Cx HW User Guide HSIC Interface (Optional) 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. Further details will be provided in a future release of this document. SGMII Interface The SOC includes an integrated Ethernet MAC with an SGMII interface, with the following key features:...

  • Page 69: Serial Ports

    LE910Cx HW User Guide Note: ETH_INT_N is a 1.8V input. It has an internal pull up to 1.8V inside the module thus it should be connected to an open drain interrupt pin of the Ethernet PHY. In case the PHY does not support 1.8V I/O, proper level shifter needs to be used.
  • Page 70 LE910Cx HW User Guide RS232 Pin# Signal Pad No. Name Usage Input to LE910Cx Data Terminal that controls the DTR - DTR_UART Ready DTE READY condition A2, B13, D4… Ground Ground Output from LE910Cx that DSR - DSR_UART Data Set Ready indicates that the module is ready Input to LE910Cx...

  • Page 71: Modem Serial Port 2

    LE910Cx HW User Guide 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 72: Rs232 Level Translation

    LE910Cx HW User Guide 8.4.3. RS232 Level Translation To interface the LE910Cx with a PC COM port or an RS232 (EIA/TIA-232) application, a level translator is required. This level translator must perform the following actions: • Invert the electrical signal in both directions •...

  • Page 73: Peripheral Ports

    LE910Cx HW User Guide Figure 17: RS232 Level Adaption Circuitry Example 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.

  • Page 74: I2C - Inter-Integrated Circuit

    LE910Cx HW User Guide • 1.8V CMOS level • Up to 50 MHz clock rate Note: The LE910Cx module supports Master mode only and cannot be configured as Slave mode. Signal Function Type Comment SPI_CLK SPI clock output 1.8V SPI_MISO SPI data Master 1.8V Shared with...

  • Page 75: Sd/Mmc Card Interface

    LE910Cx HW User Guide Note: SW emulated I2C on GPIO lines is only supported from the modem side. For more information, refer to Ref 1: LE920x4/LE910Cx AT Command User Guide for command settings.. Note: To keep backward compatibility with previous LE910 products, it is recommended to keep using the SW emulated I2C available on GPIO’s 1-10.

  • Page 76: Wifi Sdio Interface

    LE910Cx HW User Guide Signal Function Type Comments VMMC Power supply for 1.8/2.95V Max Current is MMC card pull-up 50mA resistors Table 31: SD Card Signals Figure 18 shows the recommended connection diagram of the SD interface. VMMC External PS 3V LE910Cx C=100nF SD/MMC Interface...

  • Page 77: Audio Interface

    LE910Cx HW User Guide Note: Qualcomm QCA9377 WiFi chipset may be supported on some of the LE910Cx variants. Please contact your Telit representative for more details. The LE910Cx SDIO port supports the SDIO 3.0 specification at 1.8V CMOS only, so it cannot be used as an external SD/MMC card connection.
  • Page 78 LE910Cx HW User Guide Signal Function Type Comments PCM_SYNC DVI_WA0 Digital Audio Interface (WA0) B-PD 1.8V I2S_WS PCM_DIN DVI_RX Digital Audio Interface (RX) B-PD 1.8V I2S_DIN PCM_DOUT DVI_TX Digital Audio Interface (TX) B-PD 1.8V I2S_DOUT PCM_CLK DVI_CLK Digital Audio Interface (CLK) B-PD 1.8V I2S_CLK REF_CLK...

  • Page 79: Short Frame Timing Diagrams

    LE910Cx HW User Guide 8.6.1.1. Short Frame Timing Diagrams Figure 21: Primary PCM Timing Parameter Comments Unit t(sync) PCM_SYNC cycle time µs t(synca) PCM_SYNC asserted time t(syncd) PCM_SYNC de-asserted time 124.5 µs t(clk) PCM_CLK cycle time t(clkh) PCM_CLK high time t(clkl) PCM_CLK low time PCM_SYNC offset time to...

  • Page 80: Long Frame Timing Diagrams

    LE910Cx HW User Guide 8.6.1.2. Long Frame Timing Diagrams Figure 22: Auxiliary PCM Timing 1VV0301298 Rev. 33 Page 80 of 128 2021-06-29 Not Subject to NDA...

  • Page 81: I2S Digital Audio Diagram

    LE910Cx HW User Guide Parameter Comments Unit t(auxsync) AUX_PCM__SYNC cycle time µs t(auxsynca) AUX_PCM_SYNC asserted time 62.4 62.5 µs t(auxsyncd) AUX_PCM_SYNC de-asserted time 62.4 62.5 µs t(auxclk) AUX_PCM_CLK cycle time µs t(auxclkh) AUX_PCM_CLK high time µs t(auxclkl) AUX_PCM_CLK low time µs AUX_PCM_SYNC setup time to t(suauxsync)
  • Page 82 LE910Cx HW User Guide Figure 23: I2S timing diagram Note LE910Cx family supports both PCM/I2S. Parameter Comments Unit Using internal SCK Frequency 12.288 Clock period 81.380 t(HC) Clock high 0.45*T 0.55*T t(LC) Clock low 0.45*T 0.55*T t(sr) SD and WS input setup time 16.276 t(hr) SD and WS input hold time...

  • Page 83: General Purpose I/O

    LE910Cx HW User Guide Parameter Comments Unit t(sr) SD and WS input setup time 16.276 t(hr) SD and WS input hold time t(dtr) SD and WS output delay 65.100 t(htr) SD and WS output hold time Table 36: Interface timing General Purpose I/O The general-purpose I/O pads can be configured to act in three different ways: •...
  • Page 84 LE910Cx HW User Guide The additional GPIOs below can be used in case their initial functionality is not used: Signal Initial Function Alternate Function Type Note GPIO_13 WIFI_SDRST Configurable GPIO CMOS 1.8V GPIO_14 WIFI_SDIO_CMD Configurable GPIO CMOS 1.8V GPIO_15 WIFI_SDIO_D0 Configurable GPIO CMOS 1.8V GPIO_16...

  • Page 85: Using A Gpio Pad As Input

    LE910Cx HW User Guide 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 that this device has interface levels compatible with the 1.8V CMOS levels of the GPIO.

  • Page 86: Miscellaneous Functions

    LE910Cx HW User Guide 9. MISCELLANEOUS FUNCTIONS Indication of Network Service Availability The STAT_LED pin status shows information on the network service availability and call status. In the LE910Cx module, the STAT_LED usually needs an external transistor to drive an external LED. The STAT_LED does not have a dedicated pin.

  • Page 87: Indication Of Software Ready

    LE910Cx HW User Guide Indication of Software Ready The SW_RDY signal provides indication on the module’s ability to receive commands. As long as the SW_RDY is asserted low, it indicates that the LE910Cx has not finished booting yet. Once the SW_RDY is asserted high, it indicates that the LE910Cx is ready to receive commands.

  • Page 88: Using The Adc Converter

    LE910Cx HW User Guide Item Units Input voltage range Volt AD conversion bits Resolution < 6.6 Table 41: ADC Parameters 9.5.2. Using the ADC Converter An AT command is available to use the ADC function. The command is AT#ADC=1,2. The read value is expressed in mV. Refer to Ref 1: LE920x4/LE910Cx AT Command User Guide for the full description of this function.
  • Page 89 LE910Cx HW User Guide Typical Parameters Notes Measurement Operation limits 515 m/sec A-GPS Supported Table 42: GNSS Characteristics Note: The sensitivity level has a deviation about +/- <2dB each model and device 1VV0301298 Rev. 33 Page 89 of 128 2021-06-29 Not Subject to NDA...

  • Page 90: Mounting The Module On Your Board

    LE910Cx HW User Guide 10. MOUNTING THE MODULE ON YOUR BOARD General The LE910Cx module is designed to be compliant with a standard lead-free soldering process. Finishing & Dimensions The below figure shows the mechanical dimensions of the LE910Cx module. 3 x Route Inhibit Lead-free Alloy:...
  • Page 91 LE910Cx HW User Guide Figure 26-1: LE910Cx-WWX Mechanical Dimensions (Bottom View) Note: LE910Cx-WWX mechanical dimension is bigger than other LE910Cx variants Please, refer to 10.3 section for detail information. 1VV0301298 Rev. 33 Page 91 of 128 2021-06-29 Not Subject to NDA...
  • Page 92 LE910Cx HW User Guide Figure 27: LE910Cx Mechanical Dimensions (Top view) with two kinds of shield design except for LE910Cx-WWX 1VV0301298 Rev. 33 Page 92 of 128 2021-06-29 Not Subject to NDA...
  • Page 93 LE910Cx HW User Guide Figure 28: LE910Cx-WWX Mechanical Dimensions (Top view) Note: LE910Cx-AP/NA/NS/EU/NF/ST/SA has two sheild design and LE910Cx-SV/SVX/LA/CN/EUX/SAX/WWX has one shield design. 1VV0301298 Rev. 33 Page 93 of 128 2021-06-29 Not Subject to NDA...
  • Page 94 LE910Cx HW User Guide Figure 29: LE910Cx Mechanical Dimensions (Side view) except for LE910C1-SV and -SVX Figure 30: LE910C1-SV and SVX Mechanical Dimensions (Side view) 1VV0301298 Rev. 33 Page 94 of 128 2021-06-29 Not Subject to NDA...

  • Page 95: Recommended Footprint For The Application

    LE910Cx HW User Guide Recommended Footprint for the Application Figure 31 and 31-1 shows the recommended footprint for the application board (dimensions are in mm). To facilitate the replacement of the LE910Cx module if necessary, it is suggested to design the application board 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 board in direct contact with the module.
  • Page 96 LE910Cx HW User Guide Figure 32-1: Recommended Footprint - Top View, 181 pads for LE910Cx-WWX only Note: LE910Cx-WWX footprint is same as LE910Cx variants but PCB size is differenct others. Please, refer to above dimension for LE910Cx-WWX. 1VV0301298 Rev. 33 Page 96 of 128 2021-06-29 Not Subject to NDA...

  • Page 97: Stencil

    LE910Cx HW User Guide Stencil The layout of the stencil openings can be the same as the recommended footprint (1:1). The suggested thickness of stencil foil is greater than 120 µm. PCB Pad Design The solder pads on the PCB are recommended to be of the Non-Solder Mask Defined (NSMD) type.

  • Page 98: Solder Paste

    LE910Cx HW User Guide It is not recommended to place a via or micro-via not covered by solder resist around the pads in an area of 0.15 mm unless it carries the same signal as the pad itself. Micro vias inside the pads are allowed.

  • Page 99: Cleaning

    LE910Cx HW User Guide Warning: The above solder reflow profile represents the typical SAC reflow limits and does not guarantee adequate adherence of the module to the customer application throughout the temperature range. Customer must optimize the reflow profile depending on the overall system taking into account such factors as thermal mass and warpage Profile Feature...
  • Page 100 LE910Cx HW User Guide • Cleaning with water or any organic solvent can lead to capillary effects where the cleaning solvent is absorbed into the gap between the module and the host board or even leaks inside the module (due to the gap between the module shield and PCB).

  • Page 101: Application Guide

    LE910Cx HW User Guide 11. APPLICATION GUIDE Debug of the LE910Cx Module in Production To test and debug the mounting of the LE910Cx module, we strongly recommend adding several test pads on the application board design for the following purposes: •...

  • Page 102: Sim Interface

    LE910Cx HW User Guide Bypass capacitors are needed to alleviate this behaviour. The behaviour can appear differently depending on the various applications. Customers need to pay special attention to this issue when designing their application board. The length and width of the power lines must be carefully considered, and the capacitance of the capacitors must be selected accordingly.

  • Page 103: Emc Recommendations

    LE910Cx HW User Guide Note: The resistor value on SIMIO pulled up to SIMVCC must be defined to be compliant with the 3GPP specification for USIM electrical testing. The LE910Cx module contains an internal pull-up resistor of 10K Ω on SIMIO. However, the un-mounted R1 option in the application can be used to tune SIMIO timing if necessary.

  • Page 104: Fast Boot Mode

    LE910Cx HW User Guide • 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. 11.5.1. Fast Boot mode Fast boot mode is normally used by Telit SW to enter SW download mode Fast boot is triggered by GPIO_09 (PAD L15).

  • Page 105: Packing System

    LE910Cx HW User Guide 12. PACKING SYSTEM Packing System – Tray The LE910Cx modules are packaged on trays of 36 pieces each as shown in Figure 36. These trays can be used in SMT processes for pick & place handling. Figure 37: Packing 1VV0301298 Rev.
  • Page 106 LE910Cx HW User Guide Figure 38: Tray Drawing 1VV0301298 Rev. 33 Page 106 of 128 2021-06-29 Not Subject to NDA...

  • Page 107: Tape & Reel

    LE910Cx HW User Guide Tape & Reel The LE910Cx can be packaged on reels of 200 pieces each. See figure for module positioning into the carrier. Figure 39: Module Positioning into the Carrier Figure 40: Carrier Tape Detail 1VV0301298 Rev. 33 Page 107 of 128 2021-06-29 Not Subject to NDA...
  • Page 108 LE910Cx HW User Guide Figure 41: Reel Detail Figure 42: Detail Figure 43: Reel Box Detail 1VV0301298 Rev. 33 Page 108 of 128 2021-06-29 Not Subject to NDA...

  • Page 109: Moisture Sensitivity

    LE910Cx HW User Guide Moisture Sensitivity The LE910Cx module is a Moisture Sensitive Device Level 3, in accordance with standard IPC/JEDEC J-STD-020. Comply with all the requirements for using this kind of components. 1VV0301298 Rev. 33 Page 109 of 128 2021-06-29 Not Subject to NDA...

  • Page 110: Conformity Assessment Issues

    LE910Cx HW User Guide 13. CONFORMITY ASSESSMENT ISSUES FCC/ISED Regulatory Notices Information for the OEMs and Integrators The following statement must be included with all versions of this document supplied to an OEM or integrator but should not be distributed to the end user. 1.
  • Page 111 LE910Cx HW User Guide product still requires Part 15 Subpart B compliance testing with the modular transmitter installed. The end product with an embedded module may also need to pass the FCC Part 15 unintentional emission testing requirements and be properly authorized per FCC Part Trace antenna designs See 7.2 GSM/WCDMA/TD-SCDMA/LTE Antenna - PCB Line Guidelines Summary of the specific operational use conditions...
  • Page 112 LE910Cx HW User Guide LE910C1 LE910C1 LE910C1 LE910C1/C4 LE910C1 LE910C1/C4 LE910C1 LE910C1 Frequency Freq -SAX -NA Gain -NS Gain -NF Gain -SV Gain -LA Gain -SA Gain -ST Gain Band [MHz] Gain [dBi] [dBi] [dBi] [dBi] [dBi] [dBi] [dBi] [dBi] 850 MHz 3.64 6.08...
  • Page 113 LE910Cx HW User Guide equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation.
  • Page 114 LE910Cx HW User Guide LE910C1 ST Contains FCC ID: RI7LE910C1ST Contains IC: 5131A-LE910C1ST LE910C1/C4 LA Contains FCC ID: RI7LE910CXLA Contains IC: 5131A-LE910CXLA 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...

  • Page 115: Jtbl Regulatory Notices

    LE910Cx HW User Guide Contains IC: 5131A-LE910CXLA CAN ICES-3 (B) / NMB-3 (B) This Class B digital apparatus complies with Canadian ICES-003. Cet appareil numérique de classe B est conforme à la norme canadienne ICES-003. JTBL Regulatory Notices Antenna According to Japan regulatory rule, module certification is valid only with the specific antennas registered to and approved by JRL certified body in relation to module certification.

  • Page 116: Anatel Regulatory Notices

    LE910Cx HW User Guide ANATEL Regulatory Notices "Este equipamento não tem direito à proteção contra interferência prejudicial e não pode causar interferência em sistemas devidamente autorizados" "This equipment is not entitled to protection against harmful interference and must not cause interference in duly authorized systems" LE910C1-LA Homologation # 05818-19-02618 LE910C1-AP Homologation # 04679-18-02618 LE910C4-LA Homologation # 07669-19-02618...

  • Page 117: Product And Safety Information

    LE910Cx HW User Guide PRODUCT AND SAFETY INFORMATION Copyrights and Other Notices SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE Although reasonable efforts have been made to ensure the accuracy of this document, Telit assumes no liability resulting from any inaccuracies or omissions in this document, or from the use of the information contained herein.

  • Page 118: Usage And Disclosure Restrictions

    LE910Cx HW User Guide copyrighted products. Accordingly, any copyrighted computer programs contained in Telit’s products described in this instruction manual shall not be copied (reverse engineered) or reproduced in any manner without the express written permission of the copyright owner, being Telit or the 3rd Party software supplier. Furthermore, the purchase of Telit products shall not be deemed to grant either directly or by implication, estoppel, or in any other way, any license under the copyrights, patents or patent applications of Telit or other 3...

  • Page 119: 3Rd Party Rights

    LE910Cx HW User Guide 14.2.5. 3rd Party Rights The software may include 3rd Party’s software Rights. In this case the user agrees to comply with all terms and conditions imposed in respect of such separate software rights. In addition to 3rd Party Terms, the disclaimer of warranty and limitation of liability provisions in this License, shall apply to the 3rd Party Rights software as well.
  • Page 120 LE910Cx HW User Guide • it can interfere with other electronic devices, particularly in environments such as hospitals, airports, aircrafts, etc. • there is a risk of explosion such as gasoline stations, oil refineries, etc. It is the responsibility of the user to enforce the country regulation and the specific environment regulation.

  • Page 121: Glossary

    LE910Cx HW User Guide 15. GLOSSARY Analog-to-digital converter Application-enabled CABC Content Adaptive Backlight Control 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 Global positioning system Global system for mobile communications HSIC...

  • Page 122: Document History

    LE910Cx HW User Guide 16. DOCUMENT HISTORY Revision Date Changes 2021-07-01 Section 1.5 – Updated Related Documents Section 5.1 – Added flow chart for turn on and AT command managing procedure Section 6.2 – Added note for eDRX Section 8.6 – Update Audio Interface (ThreadX OS support PCM) Section 10-3 - Recommended Footprint for the Application updated for LE910Cx-WWX Table 48: LE910Cx Current Consumption updated...
  • Page 123 LE910Cx HW User Guide Revision Date Changes Table 47 – Sensitivity level changed Sections 7.4 Antenna Diversity Requirements – Note comment changed Section 7.5 GNSS Antenna Requirements – Note added Table 39 – Sensitivity table changed and note added 2020-04-29 Section 8.3 –...
  • Page 124 LE910Cx HW User Guide Revision Date Changes 2019-03-13 Section 2.8.1 – Note added for C1-SV variant Section 3.1 – Updated E13 Pin-out Section 3.3 – Updated figure 2. LGA Pads Layout Added Fast Power Down Section 5.5 Table 18 – Updated Idle mode current consumption Section 10.2 –...
  • Page 125 LE910Cx HW User Guide Revision Date Changes 1.13 2018-05-17 Added new variant LE910C1-NF Section 2.6.1 - Added band 66 support for LE910Cx-NF Section 2.6.2 - Added band 66 and band 71 to frequency table Section 3.1 - Updated value of SIM internal pullup Section 8.3 –...
  • Page 126 LE910Cx HW User Guide Revision Date Changes Updated ESD values Updated Reference document table Section 8.3 - Updated Ethernet control interface information Section 8.5.2 – Added note related to I2C Section 2.6.2 – Updated table 4 with B25 information. Section 14.1: Added LE910C1 NS Max antenna gain.
  • Page 127 LE910Cx HW User Guide Revision Date Changes 2016-09-05 Minor edits 2016-08-30 First Draft 1VV0301298 Rev. 33 Page 127 of 128 2021-06-29 Not Subject to NDA...

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