Telit Wireless Solutions LE920 Hardware User's Manual
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Telit Wireless Solutions LE920 Hardware User's Manual

Telit Wireless Solutions LE920 Hardware User's Manual

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L L E920
H H ardware User Guide
1vv0301026 Rev.0 - draft4 – 2013-05-21
( ( Preliminary)

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Summary of Contents for Telit Wireless Solutions LE920

  • Page 1 L L E920 H H ardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05-21 ( ( Preliminary)
  • Page 2 L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- APPLICABILITY TABLE PRODUCT LE920- - EU LE920- - NA Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 2 of 76...
  • Page 3 L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 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 L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- Usage and Disclosure Restrictions License Agreements The software described in this document is the property of Telit and its licensors. It is furnished by express license agreement only and may be used only in accordance with the terms of such an agreement.

  • Page 5: Table Of Contents

    2.5.1.5. Tx: 1312 ~ 1513 ......................15 2.5.1.6. Rx: 9662 ~ 9938 ....................... 15 2.5.1.7. 400 MHz ........................15 3. LE920 Module Connections .................. 17 3.1. PIN-OUT ........................17 3.1.1. LGA Pads Layout ......................24 4. Hardware Commands ..................25 4.1.
  • Page 6 L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 4.3.2. Hardware Shutdown ...................... 29 4.3.3. Hardware Unconditional Restart ................... 30 4.3.4. Hardware Unconditional Shutdown ................31 4.4. Summary of Turning ON and OFF the module ............32 5.
  • Page 7 13.7. Solder Paste ......................66 13.7.1. Solder Reflow ......................... 66 Application guide ....................68 14.1. Debug of the LE920 in production ................68 14.2. Bypass capacitor on Power supplies ..............69 14.3. SIM interface......................69 14.4. EMC recommendations (TBD) ................70 14.5.
  • Page 8 L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- Packing system ....................72 15.1. Tray Drawing......................73 15.2. Moisture Sensibility ....................74 Safety Recommendations .................. 75 Document History ..................... 76 Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 8 of 76...

  • Page 9: Introduction

    The aim of this document is the description of some hardware solutions useful for developing a product with the Telit LE920-EU/NA module. All the features and solutions detailed are applicable to all LE920, whereas “LE920” is intended the modules listed in the applicability table.

  • Page 10: Document Organization

    Chapter 2: “General Product Description” gives an overview of the features of the product. Chapter 3: “LE920 Module Connections” deals with the pin out configuration and layout. Chapter 4: “Hardware Commands” How to control the module via hardware Chapter 5: “Power Supply”...

  • Page 11: Text Conventions

    All dates are in ISO 8601 format, i.e. YYYY-MM-DD. 1.6. Related Documents LE920-EU/NA Product Description, 80407ST10118A LE920-EU/NA AT command reference guide, 80407ST10116A Telit EVK2 User Guide, 1vv0300704 Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 11 of 76...

  • Page 12: General Product Description

    Telit LE920 module.

  • Page 13: Le920 Mechanical Dimensions

    ‡ Length: 34 mm ‡ Width: 40 mm ‡ Thickness: 2.9 mm 2.3. Weight The module weight of LE920-EU/NA is about 9.0 gram. Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 13 of 76...

  • Page 14: Environmental Requirements

    (*)Functional: the module is able to make and receive voice calls, data calls and SMS. 2.4.2. RoHS compliance As a part of Telit corporate policy of environmental protection, the LE920 complies with the RoHS (Restriction of Hazardous Substances) directive of the European Union (EU directive 2002/95/EG).

  • Page 15: Operating Frequency

    80MHz Tx: 9612 ~ 9888 WCDMA2100 – B1 1920 ~ 1980 2110 ~ 2170 190MHz Rx: 10562 ~ 10838 (LE920 both models) Tx: 9262 ~ 9538 WCDMA1900 – B2 1850 ~ 1910 1930 ~ 1990 80MHz Rx: 9662 ~ 9938...
  • Page 16 1vv0301026 Rev.0 - draft4 – 2013-05- LTE1900 – B2 Tx: 18600 ~ 19199 1850 ~ 1910 1930 ~ 1990 80MHz (LE920-NA only) Rx: 600 ~ 1199 LTE1800 – B3 1710 ~ 1785 1805 ~ 1880 Tx: 19200 ~ 19949 95MHz...

  • Page 17: Le920 Module Connections

    L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- LE920 Module Connections 3.1. PIN-OUT Signal Function Type COMMENT USB HS 2.0 Communication Port USB_D+ I/O USB differential Data(+) USB_D- I/O USB differential Data(+) USB_VBUS AI Power sense for the internal USB transceiver Power Asynchronous UART –...
  • Page 18 L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- Signal Function Type COMMENT DVI_CLK Digital Voice interface (CLK master output) 1.8V Digital I/O I/O GPIO_01 1.8V GPIO_01 I/O GPIO_02 1.8V GPIO_02 I/O GPIO_03 1.8V GPIO_03 I/O GPIO_04 1.8V GPIO_04 I/O GPIO_05...
  • Page 19 L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- Signal Function Type COMMENT Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground...
  • Page 20 L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- Signal Function Type COMMENT Ground Ground Ground Ground AP11 GND Ground AP13 GND Ground AP15 GND Ground Ground Ground Ground Ground AR10 GND Ground AR12 GND Ground AR14 GND Ground AR16 GND Ground...
  • Page 21 L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 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...
  • Page 22 When the UART signals are used as the communication port between the Host to the Modem: DTR pin must be connected in order to enter LE920’s power saving mode. RI pin must be connected in order to wake up the host when a call is coming in sleep mode of host.
  • Page 23 L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- AU11,AU15 ON/OFF* Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 23 of 76...

  • Page 24: Lga Pads Layout

    L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 3.1.1. LGA Pads Layout NOTE: The pin defined as has to be considered RESERVED and not connected on any pin in the application. The related area on the application has to be kept empty. Reproduction forbidden without written authorization from Telit Communications S.p.A.

  • Page 25: Hardware Commands

    4.1. Turning ON the LE920 To turn on LE920, the pad ON# must be tied low for at least 1 second and then released. The maximum current that can be drained from the ON# pad is 0.1 mA. A simple circuit to power on the module is illustrated below: 4.2.
  • Page 26 L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- NOTE: To check if the LE920 has powered on, the hardware line PWRMON must be monitored. When PWRMON goes high, the module has powered on. NOTE: Do not use any pull up resistor on the ON# line, it is internally pulled up. Using pull up resistor may bring to latch up problems on the LE920 power regulator and improper power on/off of the module.

  • Page 27: Turning Off The Le920

    L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 4.3. Turning OFF the LE920 Turning off the device can be done in three ways: by Software command by Hardware shutdown by Hardware Unconditional Restart by Hardware Unconditional shutdown...

  • Page 28: Shutdown By Software Command

    When a shut down command is sent, LE920 goes into the finalization state and finally will shut down PWRMON at the end of this state. The period of the finalization state can differ according to the situation in which the LE920 is so it cannot be fixed definitely.

  • Page 29: Hardware Shutdown

    4.3.2. Hardware Shutdown To turn OFF LE920 the pad ON/OFF# must be tied low for at least 2 seconds and then released. Same circuitry and timing for the power on must be used. When the hold time of ON/OFF# is above 2 seconds, LE920 goes into the finalization state and finally will shut down PWRMON at the end of this state.

  • Page 30: Hardware Unconditional Restart

    Do not use any pull up resistor on the RESET# line or any totem pole digital output. Using pull up resistor may bring to latch up problems on the LE920 power regulator and improper functioning of the module. The line RESET# must be connected only in open collector configuration.

  • Page 31: Hardware Unconditional Shutdown

    (uP_OUT2): SHDN_N Unconditional Shutdown impulse 4.3.4. Hardware Unconditional Shutdown To unconditionally Shutdown LE920, the pad SHDN_N must be tied low for at least 200 milliseconds and then released. A simple circuit to do it is: SHDN_N Unconditional Shutdown impulse Reproduction forbidden without written authorization from Telit Communications S.p.A.

  • Page 32: Summary Of Turning On And Off The Module

    Do not use any pull up resistor on the SHDN_N line or any totem pole digital output. Using pull up resistor may bring to latch up problems on the LE920 power regulator and improper functioning of the module. The line SHDN_N must be connected only in open collector configuration.

  • Page 33: Power Supply

    Read carefully the requirements and the guidelines that will follow for a proper design. 5.1. Power Supply Requirements The LE920 power requirements are: Power Supply Nominal Supply Voltage 3.8V Max Supply Voltage 4.2V...
  • Page 34 L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- GSM900 PL5 EDGE Sending data mode DCS1800 PL0 * Worst/best case depends on network configuration and is not under module control. TIP: The electrical design for the Power supply must be made ensuring that it will be capable of a peak current output of at least 2A.

  • Page 35: General Design Rules

    A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current absorption peaks close to LE920 D  ) WDQWDOXP FDSDFLWRU LV usually suited. Make sure the low ESR capacitor on the power supply output (usually a tantalum one) is rated at least 10V.

  • Page 36: Input Source Power Supply Design Guidelines

    A protection diode must be inserted close to the power input, in order to save LE920 from power polarity inversion. This can be the same diode as for spike protection. Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
  • Page 37 L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- An example of switching regulator with 12V input is in the below schematic (it is split in 2 parts): Switching regulator Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 37 of 76...

  • Page 38: Battery Source Power Supply Design Guidelines

    NOTE: Do not use any Ni-Cd, Ni-MH, and Pb battery types directly connected with LE920. Their use can lead to overvoltage on LE920 and damage it. Use only Li-Ion battery types. A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current DEVRUSWLRQ SHDNV D  ) WDQWDOXP FDSDFLWRU LV XVXDOO\ VXLWHG Make sure the low ESR capacitor (usually a tantalum one) is rated at least 10V.

  • Page 39: Thermal Design Guidelines

    For the heat generated by the LE920, you can consider it to be during transmission 2W max during class12 GPRS upload. This generated heat will be mostly conducted to the ground plane under the LE920;...

  • Page 40: Power Supply Pcb Layout Guidelines

    A misplaced component can be useless or can even decrease the power supply performances. The Bypass low ESR capacitor must be placed close to the Telit LE920 power input pads, or in the case the power supply is a switching type, it can be placed...
  • Page 41 L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- The power supply input cables must be kept separately from noise sensitive lines such as microphone/earphone cables. Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 41 of 76...

  • Page 42: Antenna(S)

    LE920 antenna pad (AD1) by means of a transmission line implemented in the PCB. In the case that the antenna is not directly connected at the antenna pad of the LE920, then a PCB line is required in order to connect with it or with its connector.

  • Page 43: Gsm/Wcdma/Lte Antenna - Pcb Line Guidelines

    Place EM noisy devices as far as possible from LE920 antenna line. Keep the antenna line far away from the LE920 power supply lines. If EM noisy devices are present on the PCB hosting the LE920, such as fast switching ICs, take care of shielding them with a metal frame cover.

  • Page 44: Gsm/Wcdma/Lte Antenna - Installation Guidelines

    LE920 antenna pad (AU9) by means of a transmission line implemented on the PCB. In the case that the antenna is not directly connected at the antenna pad of the LE920, then a PCB line is required in order to connect with it or with its connector.

  • Page 45: Gps/Gnss Antenna Requirements

    6.5. GPS/GNSS Antenna Requirements LE920 supports only passive antenna and includes an internal LNA inside (13.5dB gain typ.). It is recommended to use antennas as follow: An external passive antenna (GPS only) An external passive antenna, GNSS pre-Filter NOTE: The external GNSS pre-Filter shall be required for GLONASS application.

  • Page 46: Linear And Patch Gps/Gnss Antenna

    When using the Telit LE920, since there’s no antenna connector on the module, the antenna must be connected to the LE920 through the PCB with the antenna pad. In the case that the antenna is not directly connected at the antenna pad of the LE920, then a PCB line is required.

  • Page 47: Gps/Gnss Antenna - Installation Guidelines

    Ground planes; or shield it with a metal frame cover. If you do not have EM noisy devices around the PCB of LE920, use a Micro strip line on the superficial copper layer for the antenna line. The line attenuation will be lower than a buried one.

  • Page 48: Logic Level Specifications

    The following table shows the logic level specifications used in the Telit LE920 interface circuits: NOTE: Do not connect LE920’s digital logic signal directly to OEM’s digital logic signal of with level higher than 2.7V for 1.8V CMOS signals. For 1.8V CMOS signals:...

  • Page 49: Usb Port

    L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- USB Port The LE920 module includes a Universal Serial Bus (USB) transceiver, which operates at USB low-speed (1.5Mbits/sec), USB full-speed (12Mbits/sec) and USB high-speed (480Mbits/sec). It is compliant with the USB 2.0 specification and can be used for diagnostic monitoring, control and data transfers.

  • Page 50: Serial Ports

    The only configuration that does not need a level translation is the 1.8V UART. The serial port 1 on LE920 is a +1.8V UART with all the 7 RS232 signals. It differs from the PC-RS232 in signal polarity (RS232 is reversed) and levels.

  • Page 51: Modem Serial Port 1

    According to V.24, RX/TX signal names are referred to the application side, therefore on the LE920 side these signal are on the opposite direction: TXD on the application side will be connected to the receive line (here named TXD/ rx_uart ) of the LE920 serial port and vice versa for RX.

  • Page 52: Modem Serial Port 2

    L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 9.2. Modem Serial Port 2 Serial port 2 on the LE920 is a +1.8V UART with only the RX and TX signals. The signals of the LE920 serial port are: Signal Function...
  • Page 53 L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- An example of RS232 level adaption circuitry could be accomplished using a MAXIM transceiver (MAX218). In this case the chipset is capable of translating directly from 1.8V to the RS232 levels (Example on 4 signals only).

  • Page 54: Audio Section Overview

    10. Audio Section Overview The LE920 module support digital audio interface. 10.1. Digital Audio LE920 module can be connected to external codec through digital interface. The product is providing one Digital Audio Interface (DVI) on the following Pins: Signal Function...
  • Page 55 L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 55 of 76...

  • Page 56: General Purpose I/O

    Input pads can only be read and report the digital value (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 the LE920 firmware and acts depending on the function implemented.

  • Page 57: Logic Level Specifications

    11.1. Logic Level Specifications Where not specifically stated, all the interface circuits work at 1.8V CMOS logic levels. The following table shows the logic level specifications used in the LE920 interface circuits: For 1,8V signals: Absolute Maximum Ratings -Not Functional...

  • Page 58: Using A Gpio Pad As Output

    L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 11.3. Using a GPIO Pad as Output The GPIO pads, when used as outputs, can drive 1.8V CMOS digital devices or compatible hardware. When set as outputs, the pads have a push-pull output and therefore the pull-up resistor may be omitted.

  • Page 59: Using The Temperature Monitor Function

    The STAT_LED pin status shows information on the network service availability and call status. In the LE920 modules, the STAT_LED usually needs an external transistor to drive an external LED. Because of the above, the status indicated in the following table is reversed...

  • Page 60: Rtc Bypass Out

    L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 11.6. RTC Bypass Out The VRTC pin brings out the Real Time Clock supply, which is separate from the rest of the digital part, allowing having only RTC going on when all the other parts of the device are off. To this power output a backup capacitor can be added in order to increase the RTC autonomy during power off of the battery.

  • Page 61: Adc Section

    AD conversion bits Resolution < 6.6 The LE920 module provides 3 Analog to Digital Converters. 12.1.2. Using 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 SW User Guide or AT Commands Reference Guide for the full description of this function.

  • Page 62: Mounting The Module On Your Board

    1vv0301026 Rev.0 - draft4 – 2013-05- 13. Mounting the module on your board 13.1. General The LE920 modules have been designed in order to be compliant with a standard lead-free SMT process.Module 13.2. Finishing & Dimensions Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.

  • Page 63: Recommended Foot Print For The Application

    198 pads Top View In order to easily rework the LE920 it is suggested to consider on the application having 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.

  • Page 64: Stencil

    L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 13.4. Stencil Stencil’s apertures layout can be the same as the recommended footprint (1:1). A suggested thickness of stencil foil is greater than 120 μm. 13.5. PCB Pad Design Non solder mask defined (NSMD) type is recommended for the solder pads on the PCB.
  • Page 65 L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- It is not recommended to place via or micro-via not covered by solder resist in an area of 0,3 mm around the pads unless it carries the same signal of the pad itself (see following figure). Holes in pad are allowed only for blind holes and not for through holes.

  • Page 66: Solder Paste

    L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 13.7. Solder Paste Solder Paste Lead free Sn/Ag/Cu We recommend using only “no clean” solder paste in order to avoid the cleaning of the modules after assembly. 13.7.1. Solder Reflow Recommended solder reflow profile: Reproduction forbidden without written authorization from Telit Communications S.p.A.
  • Page 67 All temperatures refer to topside of the package, measured on the package body surface. WARNIG: The LE920 module withstands one reflow process only. Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 67 of 76...

  • Page 68: Application Guide

    14.1. Debug of the LE920 in production To test and debug the mounting of LE920, we strongly recommend to foresee test pads on the host PCB, in order to check the connection between the LE920 itself and the application and to test the performance of the module connecting it with an external computer.

  • Page 69: Bypass Capacitor On Power Supplies

    L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 14.2. Bypass capacitor on Power supplies When a sudden voltage is asserted to or cut from the power supplies, the steep transition makes some reactions such as the overshoot and undershoot. This abrupt voltage transition can affect the device not to work or make it malfunction.

  • Page 70: Emc Recommendations (Tbd)

    L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 14.4. EMC recommendations (TBD) LE920 signals are provided by some EMC protections. In any case the accepted levels are different on the pins. The characteristics are described in the following Table: Signal Function...

  • Page 71: Download And Debug Port

    Download and Debug Port One of the following options should be chosen in the design of host system in order to download or upgrade the Telit’s software and debug LE920 when LE920 is already mounted on a host system. Users who use both of UART and USB interfaces to communicate LE920 Must implement a download method in a host system for upgrading when it’s...

  • Page 72: Packing System

    1vv0301026 Rev.0 - draft4 – 2013-05- 15. Packing system The Telit LE920 is packaged on trays. Each tray contains 20 pieces as shown in the following picture: Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.

  • Page 73: Tray Drawing

    L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 15.1. Tray Drawing Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 73 of 76...

  • Page 74: Moisture Sensibility

    15.2. Moisture Sensibility The LE920 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. Calculated shelf life in sealed bag: 4 months at <40°C and <90% relative humidity (RH).

  • Page 75: Safety Recommendations

    L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 16. Safety Recommendations READ CAREFULLY Be sure about 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 has to be avoided in the following areas: Where it can interfere with other electronic devices in environments such as hospitals, airports, aircrafts, etc.

  • Page 76: Document History

    L L E920 Hardware User Guide 1vv0301026 Rev.0 - draft4 – 2013-05- 17. Document History Revision Date Changes 0-draft1 2012-10-03 First issue 0-draft2 2012-12-11 - Remove SIM2 interface - Remove external GPS LNA support 0-draft3 2013-03-12 Updated pin-out 0-draft4 2013-05-21 - Update DVI - Adding Current consumption - Adding SHDN_N section...

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