Telit Wireless Solutions HE920-NA Hardware User's Manual
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Telit Wireless Solutions HE920-NA Hardware User's Manual

Telit Wireless Solutions HE920-NA Hardware User's Manual

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HE920
Hardware User Guide
1vv0301014 Rev.9 – 2014-01-23

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  • Page 1 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23...
  • Page 2 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 APPLICABILITY TABLE PRODUCT HE920-EU HE920-NA Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 2 of 84...
  • Page 3 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 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 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 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

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 Contents Introduction ..........9 1.1. Scope ............. 9 1.2. Audience ..........9 1.3. Contact Information, Support ......9 1.4. Document Organization ........10 1.5. Text Conventions ......... 11 1.6. Related Documents ........11 General Product Description .........
  • Page 6 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 5.2.1. Electrical Design Guidelines ....... 35 5.2.1.1. + 5V Input Source Power Supply Design Guidelines ..35 5.2.1.2. + 12V Input Source Power Supply Design Guidelines ..36 5.2.1.3. Battery Source Power Supply Design Guidelines ... 38 5.2.2.
  • Page 7 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 11.4.1. Short Description ........60 11.5. Indication of Network Service Availability ..... 60 11.6. RTC Bypass Out ......... 61 11.7. VAUX Power Output ........61 12. DAC and ADC section ......... 62 12.1.
  • Page 8 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 16.1. 1999/5/EC Directive ........79 16.2. FCC/IC Regulatory notices ......81 17. Safety Recommendations ........83 18. Document History ..........84 Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.

  • Page 9: Introduction

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 1. Introduction 1.1. Scope The aim of this document is the description of some hardware solutions useful for developing a product with the Telit HE920-EU/NA module. All the features and solutions detailed are applicable to all HE920, whereas “HE920”...

  • Page 10: Document Organization

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 1.4. Document Organization This document contains the following chapters: Chapter 1: “Introduction” provides a scope for this document, target audience, contact and support information, and text conventions. Chapter 2: “General Product Description” gives an overview of the features of the product.

  • Page 11: Text Conventions

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 1.5. Text Conventions Danger – This information MUST be followed or catastrophic equipment failure or bodily injury may occur. Caution or Warning – Alerts the user to important points about integrating the module, if these points are not followed, the module and end user equipment may fail or malfunction.

  • Page 12: General Product Description

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 2. General Product Description 2.1. Overview The aim of this document is the description of some hardware solutions useful for developing a product with the Telit HE920 module. In this document all the basic functions of a mobile phone will be taken into account; for each one of them a proper hardware solution will be suggested and eventually the wrong solutions and common errors to be avoided will be evidenced.

  • Page 13: He920 Mechanical Dimensions

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 2.2. HE920 Mechanical Dimensions The Telit HE920 module overall dimensions are: • Length: 34 mm • Width: 40 mm • Thickness: 2.8 mm 2.3. Weight The module weight of HE920-EU/NA is about 9.0 gram. Reproduction forbidden without written authorization from Telit Communications S.p.A.

  • Page 14: Environmental Requirements

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 2.4. Environmental requirements 2.4.1. Temperature range Note –20°C ~ +55°C The module is fully functional(*) in all the temperature range, and it fully meets the ETSI specifications. Operating Temperature –40°C ~ +85°C Range The module is fully functional(*) in all the temperature range.

  • Page 15: Operating Frequency

    45MHz (HE920-EU only) Rx: 2937 ~ 3088 WCDMA(AWS) Tx: 1312 ~ 1513 1712.4 ~ 1752.6 2112.4 ~ 2152.6 400MHz (HE920-NA only) Rx: 1537 ~ 1738 WCDMA1900 Tx: 9262 ~ 9538 1852.4 ~ 1907.6 1932.4 ~ 1987.6 80MHz (HE920-NA only) Rx: 9662 ~ 9938...

  • Page 16: He920 Module Connections

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 3. HE920 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(-) Analog input used to sense whether a peripheral device USB_ID(TBD) is connected, and determine the peripheral type, a host Analog...
  • Page 17 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 Signal Function Type COMMENT DVI_RX I/O Digital Voice interface (RX) 1.8V DVI_TX I/O Digital Voice interface (TX) 1.8V DVI_CLK I/O Digital Voice interface (CLK) 1.8V Digital IO I/O GPIO_01 1.8V GPIO_01 I/O GPIO_02 1.8V GPIO_02 I/O GPIO_03...
  • Page 18 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 Signal Function Type COMMENT Power AU17 VBATT_PA Main Power Supply (PAM) Power AU19 VBATT_PA Main Power Supply (PAM) Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground...
  • Page 19 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 Signal Function Type COMMENT AM19 GND Ground AN16 GND Ground AN18 GND Ground Ground Ground Ground Ground AP11 GND Ground AP13 GND Ground AP15 GND Ground Ground Ground Ground Ground AR10 GND Ground AR12 GND Ground...
  • Page 20 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 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...
  • Page 21 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 Signal Function Type COMMENT AF17 Reserved Reserved Reserved Reserved AH17 Reserved Reserved Reserved Reserved Reserved Reserved AM1 Reserved Reserved AM3 Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved AN14 Reserved Reserved Reserved Reserved...
  • Page 22 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 ON/OFF* RESET* USB_D+ USB_D- USB_VBUS AH19 C103/TXD AF19 C104/RXD AA18 C105/RTS AK19 C106/CTS AB19 TXD_AUX AD19 RXD_AUX Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 22 of 84...

  • Page 23: Lga Pads Layout

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 3.1.1. LGA Pads Layout Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 23 of 84...
  • Page 24 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 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. - All Rights Reserved.

  • Page 25: Hardware Commands

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 4. Hardware Commands 4.1. Turning ON the HE920 To turn on HE920, the pad ON_OFF* must be tied 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. A simple circuit to power on the module is illustrated below: 4.2.
  • Page 26 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 NOTE: To check if the HE920 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_OFF* line, it is internally pulled up. Using pull up resistor may bring to latch up problems on the HE920 power regulator and improper power on/off of the module.

  • Page 27: Turning Off The He920

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 4.3. Turning OFF the HE920 Turning off the device can be done in two ways:  by software command (see HE920 Software User Guide)  by Hardware shutdown(pad ON_OFF*) When the device is shut down by software command or by hardware shutdown(pad ON_OFF*), it issues to the network a detach request that informs the network that the device will not be reachable any more.

  • Page 28: Shutdown By Software Command

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 4.3.1. Shutdown by Software Command HE920 can be shut down by a software command. When a shut down command is sent, HE920 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 HE920 is so it cannot be fixed definitely.

  • Page 29: Hardware Shutdown

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 4.3.2. Hardware Shutdown To turn OFF HE920 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, HE920 goes into the finalization state and finally will shut down PWRMON at the end of this state.

  • Page 30: Hardware Unconditional Restart (Reset)

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 4.4. Hardware Unconditional Restart (RESET) To unconditionally restart HE920, the pad RESET* must be tied low for at least 200 milliseconds and then released. A simple circuit to do it is: RESET# Unconditional Restart impulse NOTE:...

  • Page 31: Hardware Unconditional Shutdown (Power Off)

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 For example: 1- Let us assume you need to drive the RESET* pad with a totem pole output of a +1.8/5 V microcontroller (uP_OUT2): +1.8 / 5V 4.5. Hardware Unconditional Shutdown (Power Off) The Unconditional Shutdown of the module could be activated using the SHDN* line (pad AN12).

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

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 NOTE: Do not use any pull up resistor on the SHDN* line nor any totem pole digital output. Using pull up resistor may bring to latch up problems on the HE920 power regulator and improper functioning of the module.

  • Page 33: Power Supply

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 5. Power Supply The power supply circuitry and board layout are a very important part in the full product design and they strongly reflect on the product overall performances. Read carefully the requirements and the guidelines that will follow for a proper design.
  • Page 34 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 In GSM/GPRS mode, RF transmission is not continuous and it is packed into bursts at a base frequency of about 216 Hz, and the relative current peaks can be as high as about 2A. Therefore the power supply has to be designed in order to withstand these current peaks without big voltage drops;...

  • Page 35: General Design Rules

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 5.2. General Design Rules The principal guidelines for the Power Supply Design embrace three different design steps:  the electrical design  the thermal design  the PCB layout 5.2.1. Electrical Design Guidelines The electrical design of the power supply depends strongly on the power source where this power is drained.

  • Page 36: Input Source Power Supply Design Guidelines

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 An example of linear regulator with 5V input is: 5.2.1.2. + 12V Input Source Power Supply Design Guidelines  The desired output for the power supply is 3.8V, hence due to the big difference between the input source and the desired output, a linear regulator is not suited and must not be used.
  • Page 37 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 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 38: Battery Source Power Supply Design Guidelines

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 5.2.1.3. Battery Source Power Supply Design Guidelines  The desired nominal output for the power supply is 3.8V and the maximum allowed voltage is 4.2V, hence a single 3.7V Li-Ion cell battery type is suited for supplying the power to the Telit HE920 module.

  • Page 39: Thermal Design Guidelines

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 5.2.2. Thermal Design Guidelines The thermal design for the power supply heat sink must be done with the following specifications:  Average current consumption during HSPA transmission @PWR level max in HE920: 640mA ...

  • Page 40: Power Supply Pcb Layout Guidelines

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 area as large as possible under HE920 which you will mount. You must mount HE920 on the large ground area of your application board and make many ground vias to dissipate the heat. The peak current consumption in the GSM mode is higher than that in WCDMA.
  • Page 41 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 overlapped to any noise sensitive circuitry as the microphone amplifier/buffer or earphone amplifier.  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 42: Antenna(S)

    Frequency Depending by frequency band(s) provided by the network operator, the range customer must use the most suitable antenna for that/those band(s) HE920-EU HE920-NA GSM850 : 70 MHz GSM850 : 70 MHz GSM900 : 80 MHz GSM900 : 80 MHz...

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

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 Furthermore if the device is developed for the US and/or Canada market, it must comply with the FCC and/or IC approval requirements: This device is to be used only for mobile and fixed application. In order to re-use the Telit FCC/IC approvals the antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter.

  • Page 44: Gsm/Wcdma Antenna - Installation Guidelines

    Depending by frequency band(s) provided by the network operator, the Frequency range customer shall use the most suitable antenna for that/those band(s) HE920-EU HE920-NA WCDMA band I(2100) : 60 MHz WCDMA band II(1900) : 60 MHz Bandwidth WCDMA band V(850) : 25 MHz...

  • Page 45: Gps/Gnss Antenna Requirements

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 NOTE: If the RX Diversity is not used/connected, disable the Diversity functionality using the AT#CRXD command and leave the pad AU9 unconnected. Please refer to the AT command User Guide in detail. 6.5.
  • Page 46 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 NOTE: The external GNSS LNA and GNSS pre-Filter shall be required for GLONASS application. GNSS LNA requirement shall fulfill the following specifications.  Frequency = 1565 – 1606MHz  Power Gain|S21| = 14 – 17dB ...

  • Page 47: Gps/Gnss Antenna - Pcb Line Guidelines

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 An example of GNSS antenna supply circuit is shown in the following image: When using the Telit HE920, since there’s no antenna connector on the module, the antenna must be connected to the HE920 through the PCB with the antenna pad. In the case that the antenna is not directly connected at the antenna pad of the HE920, then a PCB line is required.

  • Page 48: Gps/Gnss Antenna - Installation Guidelines

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23  Keep one layer of the PCB used only for the Ground plane; if possible.  Surround (on the sides, over and under) the antenna line on PCB with Ground. Avoid having other signal tracks directly facing the antenna line track. ...

  • Page 49: Logic Level Specifications

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 7. 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 Telit HE920 interface circuits: NOTE: Do not connect HE920’s digital logic signal directly to OEM’s digital logic signal of with...

  • Page 50: Reset Signal(Module Restart)

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 7.1. Reset Signal(Module Restart) Signal Function PAD Number Phone reset RESET* (restart) RESET is used to reset the HE920 module. Whenever this signal is pulled low HE920 is reset (restart). When the device is reset it stops all operations. After the release of the reset HE920 is unconditionally shut down, without doing any detach operations from the network where it is registered.

  • Page 51: Usb Port

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 8. USB Port The HE920 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 52: Serial Ports

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 9. Serial Ports The serial port on the Telit HE920 is the interface between the module and OEM hardware. 2 serial ports are available on the module:  MODEM SERIAL PORT 1(Main) ...

  • Page 53: Modem Serial Port 1

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 9.1. Modem Serial Port 1 Serial port 1 on the HE920 is a +1.8V UART with all 7 RS232 signals. It differs from the PC-RS232 in the signal polarity (RS232 is reversed) and levels. RS232 HE920 Signal...

  • Page 54: Modem Serial Port 2

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 9.2. Modem Serial Port 2 Serial port 2 on the HE920 is a +1.8V UART with only the RX and TX signals. The signals of the HE920 serial port are: Signal Function Type COMMENT TXD_AUX O...
  • Page 55 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 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). NOTE: In this case has to be taken in account the length of the lines on the application to avoid problems in case of High-speed rates on RS232.

  • Page 56: Audio Section Overview

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 10. Audio Section Overview The HE920 module supports an analog audio interface and digital audio interface. 10.1. Analog Audio The HE920 module provides two analog audio paths transmitting and receiving. Please refer to the xE920_Audio_Settings_Application_Note, 80404NT10095A 10.2.

  • Page 57: General Purpose I/O

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 11. General Purpose I/O The general-purpose I/O pads can be configured to act in three different ways:  input  output  alternate function (internally controlled) Input pads can only be read and report the digital value (high or low) present on the pad at the read time;...

  • Page 58: Logic Level Specifications

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 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 HE920 interface circuits: For 1,8V signals: Absolute Maximum Ratings -Not Functional HE920...

  • Page 59: Using A Gpio Pad As Output

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 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 60: Using The Temperature Monitor Function

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 11.4. Using the Temperature Monitor Function 11.4.1. Short Description The Temperature Monitor is a function of the module that permits to control its internal temperature and if properly set (see the #TEMPMON command on AT Interface guide) it raises to High Logic level a GPIO when the maximum temperature is reached.

  • Page 61: Rtc Bypass Out

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 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 62: Dac And Adc Section

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 12. DAC and ADC section 12.1. DAC Converter 12.1.1. Description The HE920 module provides a Digital to Analog Converter. The signal (named DAC_OUT) is available on pad E14 of the HE920 module. The on board DAC is in the range from 0 to 1023.

  • Page 63: Low Pass Filter Example

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 12.1.3. Low Pass Filter Example 12.2. ADC Converter 12.2.1. Description The on board ADCs are 8-bit converters. They are able to read a voltage level in the range of 0-2 volts applied on the ADC pin input and store and convert it into 8 bit word. Units Input Voltage range Volt...

  • Page 64: Mounting The Module On Your Board

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 13. Mounting the module on your board 13.1. General The HE920 modules have been designed in order to be compliant with a standard lead-free SMT process. Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.

  • Page 65: Module Finishing & Dimensions

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 13.2. Module Finishing & Dimensions Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 65 of 84...

  • Page 66: Recommended Foot Print For The Application

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 13.3. Recommended foot print for the application 198 pads Top View In order to easily rework the HE920 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 67: Stencil

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 13.4. Stencil Stencil’s apertures layout can be the same as the recommended footprint (1:1), we suggest a thickness of stencil foil ≥ 120 µm. 13.5. PCB Pad Design Non solder mask defined (NSMD) type is recommended for the solder pads on the PCB. Reproduction forbidden without written authorization from Telit Communications S.p.A.

  • Page 68: Recommendations For Pcb Pad Dimensions (Mm)

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 13.6. Recommendations for PCB Pad Dimensions (mm) The recommendation for the PCB pads dimensions are described in the following image (dimensions in mm) Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
  • Page 69 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 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).

  • Page 70: Solder Paste

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 13.7. Solder Paste Lead free Solder Paste 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 71 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 Profile Feature Pb-Free Assembly Average ramp-up rate(T to T 3℃/second max Preheat 150℃ Temperature Min(Tsmin) Temperature Max(Tsmax) 200℃ Time (min to max) (ts) 60 - 180 seconds Tsmax to TL Ramp-up Rate 3℃/second max Time maintained above: Temperature (TL)

  • Page 72: Application Guide

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 14. Application guide 14.1. Debug of the HE920 in production To test and debug the mounting of HE920, we strongly recommend foreseeing test pads on the host PCB, in order to check the connection between the HE920 itself and the application and to test the performance of the module connecting it with an external computer.

  • Page 73: Bypass Capacitor On Power Supplies

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 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. The bypass capacitors are needed to alleviate this behavior and it can be affected differently according to the various applications.

  • Page 74: Sim Interface

    The resistor value on SIMIO pulled up to SIMVCC should be defined accordingly in order to be compliant to 3GPP specification. For HE920-EU and HE920-NA contain an internal pull-up resistor on SIMIO. However, the un-mounted option in application design can be recommended in order to tune R1 if necessary.

  • Page 75: Emc Recommendations

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 14.4. EMC recommendations HE920 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 Contact Power Supply AP17,AP19,...

  • Page 76: Download And Debug Port

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 14.5. 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 HE920 when HE920 is already mounted on a host system.

  • Page 77: Packing System

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 15. Packing system The Telit HE920 is packaged on trays. Each tray contains 20 pieces with the following dimensions: 15.1. Tray Drawing (1VV0700623_DTS) WARNIG: These trays can withstand a maximum temperature of 65℃. 15.2.
  • Page 78 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 c) The maximum time between the opening of the sealed bag and the reflow process must be 168 hours if condition b) “IPC/JEDEC J-STD-033A paragraph 5.2” is respected d) Baking is required if conditions b) or c) are not respected e) Baking is required if the humidity indicator inside the bag indicates 10% RH or more Reproduction forbidden without written authorization from Telit Communications S.p.A.

  • Page 79: Conformity Assessment Issues

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 16. Conformity Assessment Issues 16.1. 1999/5/EC Directive The HE920-EU module has been assessed in order to satisfy the essential requirements of the R&TTE Directive 1999/05/EC (Radio Equipment & Telecommunications Terminal Equipments) to demonstrate the conformity against the harmonized standards with the final involvement of a Notified Body.
  • Page 80 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 Final product integrating this module must be assessed against essential requirements of the 1999/5/EC (R&TTE) Directive. It should be noted that assessment does not necessarily lead to testing. Telit Communications S.p.A. recommends carrying out the following assessments: RF spectrum use (R&TTE art.

  • Page 81: Fcc/Ic Regulatory Notices

    This equipment complies with FCC and IC radiation exposure limits set forth for an uncontrolled environment. The antenna should be installed and operated with minimum distance of 20 cm between the radiator and your body. Antenna gain must be below: Frequency band HE920-NA GSM850 / FDD V 6.79 dBi PCS1900 / FDD II 3.01 dBi...
  • Page 82 HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 FCC Class B digital device notice This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.

  • Page 83: Safety Recommendations

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 17. 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: ...

  • Page 84: Document History

    HE920 Hardware User Guide 1vv0301014 Rev.9 – 2014-01-23 18. Document History Revision Date Changes 2012-02-02 First issue 2012-06-04 Renumbered chapters Updated 2.3 Weight Updated 3 HE920 Module Connections Updated 5.1 Power Supply Requirements Updated 6.5 GPS/GNSS Antenna Requirements Updated 9.2 Modem Serial Port 2 Updated 13.2 ADC Converter Updated 14.2 Module Finishing &...

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