Telit Wireless Solutions HE920-NA Installation manual

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

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

HE920 Hardware User Guide
1vv0301014 Rev.9 –2014-01-23
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SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
Notice
While reasonable efforts have been made to assure the accuracy of this document, Telit
assumes no liability resulting from any inaccuracies or omissions in this document, or from
use of the information obtained herein. The information in this document has been carefully
checked and is believed to be entirely reliable. However, no responsibility is assumed for
inaccuracies or omissions. Telit reserves the right to make changes to any products described
herein and reserves the right to revise this document and to make changes from time to time
in content hereof with no obligation to notify any person of revisions or changes. Telit does
not assume any liability arising out of the application or use of any product, software, or
circuit described herein; neither does it convey license under its patent rights or the rights of
others.
It is possible that this publication may contain references to, or information about Telit
products (machines and programs), programming, or services that are not announced in your
country. Such references or information must not be construed to mean that Telit intends to
announce such Telit products, programming, or services in your country.
Copyrights
This instruction manual and the Telit products described in this instruction manual may be,
include or describe copyrighted Telit material, such as computer programs stored in
semiconductor memories or other media. Laws in the Italy and other countries preserve for
Telit and its licensors certain exclusive rights for copyrighted material, including the
exclusive right to copy, reproduce in any form, distribute and make derivative works of the
copyrighted material. Accordingly, any copyrighted material of Telit and its licensors
contained herein or in the Telit products described in this instruction manual may not be
copied, reproduced, distributed, merged or modified in any manner without the express
written permission of Telit. Furthermore, the purchase of Telit products shall not be deemed
to grant either directly or by implication, estoppel, or otherwise, any license under the
copyrights, patents or patent applications of Telit, as arises by operation of law in the sale of a
product.
Computer Software Copyrights
The Telit and 3rd Party supplied Software (SW) products described in this instruction manual
may include copyrighted Telit and other 3rd Party supplied computer programs stored in
semiconductor memories or other media. Laws in the Italy and other countries preserve for
Telit and other 3rd Party supplied SW certain exclusive rights for copyrighted computer
programs, including the exclusive right to copy or reproduce in any form the copyrighted
computer program. Accordingly, any copyrighted Telit or other 3rd Party supplied SW
computer programs contained in the Telit products described in this instruction manual may
not be copied (reverse engineered) or reproduced in any manner without the express written
permission of Telit or the 3rd Party SW supplier. Furthermore, the purchase of Telit products
shall not be deemed to grant either directly or by implication, estoppel, or otherwise, any
license under the copyrights, patents or patent applications of Telit or other 3rd Party supplied
SW, except for the normal non-exclusive, royalty free license to use that arises by operation
of law in the sale of a product.

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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.
Copyrighted Materials
Software and documentation are copyrighted materials. Making unauthorized copies is
prohibited by law. No part of the software or documentation may be reproduced, transmitted,
transcribed, stored in a retrieval system, or translated into any language or computer language,
in any form or by any means, without prior written permission of Telit
High Risk Materials
Components, units, or third-party products used in the product described herein are NOT
fault-tolerant and are NOT designed, manufactured, or intended for use as on-line control
equipment in the following hazardous environments requiring fail-safe controls: the operation
of Nuclear Facilities, Aircraft Navigation or Aircraft Communication Systems, Air Traffic
Control, Life Support, or Weapons Systems (High Risk Activities"). Telit and its supplier(s)
specifically disclaim any expressed or implied warranty of fitness for such High Risk
Activities.
Trademarks
TELIT and the Stylized T Logo are registered in Trademark Office. All other product or
service names are the property of their respective owners.
Copyright © Telit Communications S.p.A. 2013.

HE920 Hardware User Guide
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Contents
1. 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
2. General Product Description ................................. 12
2.1. Overview ................................................. 12
2.2. HE920 Mechanical Dimensions .............................. 13
2.3. Weight ................................................... 13
2.4. Environmental requirements ............................... 14
2.4.1. Temperature range .......................................... 14
2.4.2. RoHS compliance ............................................ 14
2.5. Operating Frequency ...................................... 14
3. HE920 Module Connections .................................... 16
3.1. PIN-OUT .................................................. 16
3.1.1. LGA Pads Layout ............................................ 23
4. Hardware Commands ........................................... 25
4.1. Turning ON the HE920 ..................................... 25
4.2. Initialization and Activation state ...................... 25
4.3. Turning OFF the HE920 .................................... 27
4.3.1. Shutdown by Software Command ............................... 28
4.3.2. Hardware Shutdown .......................................... 29
4.4. Hardware Unconditional Restart (RESET) ................... 30
4.5. Hardware Unconditional Shutdown (Power Off) .............. 31
4.6. Summary of Turning ON and OFF the module ................. 32
5. Power Supply ................................................ 33
5.1. Power Supply Requirements ................................ 33
5.2. General Design Rules ..................................... 35

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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. Thermal Design Guidelines .................................. 39
5.2.3. Power Supply PCB Layout Guidelines ......................... 40
6. Antenna(s) .................................................. 42
6.1. GSM/WCDMA Antenna Requirements ........................... 42
6.2. GSM/WCDMA Antenna –PCB line Guidelines .................. 43
6.3. GSM/WCDMA Antenna –Installation Guidelines .............. 44
6.4. Antenna Diversity Requirements ........................... 44
6.5. GPS/GNSS Antenna Requirements ............................ 45
6.5.1. Combined GPS/GNSS Antenna .................................. 45
6.5.2. Linear and Patch GPS/GNSS Antenna .......................... 45
6.5.3. LNA and Front End Design Considerations .................... 45
6.5.4. GPS/GNSS Antenna - PCB Line Guidelines ..................... 47
6.5.5. GPS/GNSS Antenna –Installation Guidelines ................. 48
7. Logic Level Specifications .................................. 49
7.1. Reset Signal(Module Restart) ............................. 50
8. USB Port .................................................... 51
9. Serial Ports ................................................ 52
9.1. Modem Serial Port 1 ...................................... 53
9.2. Modem Serial Port 2 ...................................... 54
9.3. RS232 Level Translation .................................. 54
10. Audio Section Overview ...................................... 56
10.1. Analog Audio ........................................... 56
10.2. Digital Audio .......................................... 56
10.2.1. CODEC Example ............................................ 56
11. General Purpose I/O ......................................... 57
11.1. Logic Level Specifications ............................. 58
11.2. Using a GPIO Pad as Input .............................. 58
11.3. Using a GPIO Pad as Output ............................. 59
11.4. Using the Temperature Monitor Function ................. 60

HE920 Hardware User Guide
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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. DAC Converter .......................................... 62
12.1.1. Description .............................................. 62
12.1.2. Enabling DAC ............................................. 62
12.1.3. Low Pass Filter Example .................................. 63
12.2. ADC Converter .......................................... 63
12.2.1. Description .............................................. 63
12.2.2. Using ADC Converter ...................................... 63
13. Mounting the module on your board ........................... 64
13.1. General ................................................ 64
13.2. Module Finishing & Dimensions .......................... 65
13.3. Recommended foot print for the application ............. 66
13.4. Stencil ................................................ 67
13.5. PCB Pad Design ......................................... 67
13.6. Recommendations for PCB Pad Dimensions (mm) ............ 68
13.7. Solder Paste ........................................... 70
13.7.1. Solder Reflow ............................................ 70
14. Application guide ........................................... 72
14.1. Debug of the HE920 in production ....................... 72
14.2. Bypass capacitor on Power supplies ..................... 73
14.3. SIM interface .......................................... 74
14.3.1. SIM schematic example .................................... 74
14.4. EMC recommendations .................................... 75
14.5. Download and Debug Port ................................ 76
15. Packing system .............................................. 77
15.1. Tray Drawing ........................................... 77
15.2. Moisture Sensibility ................................... 77
16. Conformity Assessment Issues ................................ 79

HE920 Hardware User Guide
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16.1. 1999/5/EC Directive .................................... 79
16.2. FCC/IC Regulatory notices .............................. 81
17. Safety Recommendations ...................................... 83
18. Document History ............................................ 84

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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” is intended the modules listed in the applicability
table.
When a specific feature is applicable to a specific product, it will be clearly highlighted.
1.2. Audience
This document is intended for Telit customers, who are integrators, about to implement their
applications using our HE920 module.
1.3. Contact Information, Support
For general contact, technical support, to report documentation errors and to order manuals,
contact Telit’s Technical Support Center (TTSC) at:
TS-[email protected]
TS-NORTHAMERIC[email protected]
TS-LATINAMERIC[email protected]
TS-[email protected]
Alternatively, use:
http://www.telit.com/en/products/technical-support-center/contact.php
For detailed information about where you can buy the Telit modules or for recommendations
on accessories and components visit:
http://www.telit.com
To register for product news and announcements or for product questions contact Telit’s
Technical Support Center (TTSC).
Our aim is to make this guide as helpful as possible. Keep us informed of your comments and
suggestions for improvements.
Telit appreciates feedback from the users of our information.

HE920 Hardware User Guide
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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.
Chapter 3: “HE920 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” deals on supply and consumption.
Chapter 6: “Antenna” The antenna connection and board layout design are the most important
parts in the full product design
Chapter 7: “Logic Level specifications” Specific values adopted in the implementation of
logic levels for this module.
Chapter 8: “USB Port”
Chapter 9: “Serial Ports”
Chapter 10: “Audio Section Overview”
Chapter 11: “General Purpose I/O” How the general purpose I/O pads can be configured.
Chapter 12 “DAC and ADC Section” Deals with these two kind of converters.
Chapter 13: “Mounting the module on your board”
Chapter 14: “Application Guides”
Chapter 15: “Packing System”
Chapter 16: “Conformity Assessments Issues”
Chapter 17: “Safety Recommendations”
Chapter 18: “Document History”