Telit Wireless Solutions SL869 Hardware User's Manual
SL869 Hardware User Guide
1vv0301001 Rev.2 – 2013-12-17
SL869 Hardware User Guide
1vv0301001 Rev.2 – 2013-12-7
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APPLICABILITY TABLE
PRODUCT
SL869
SL869 Hardware User Guide
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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.
SL869 Hardware User Guide
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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.
SL869 Hardware User Guide
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Contents
1. Introduction .......................................................................................................... 7
1.1. Scope ........................................................................................................................ 7
1.2. Audience ................................................................................................................... 7
1.3. Contact Information, Support ................................................................................... 7
1.4. Document Organization ............................................................................................ 8
1.5. Text Conventions ...................................................................................................... 8
1.6. Related Documents .................................................................................................. 8
2. Powering the SL869 .............................................................................................. 9
2.1. 3.3V Supply Voltage .................................................................................................. 9
2.2. Battery Back-up ....................................................................................................... 9
3. Updating the Firmware ...................................................................................... 10
4. Communications ................................................................................................. 11
4.1. Main Serial Interface .............................................................................................. 11
4.2. Secondary Serial Interface ..................................................................................... 11
4.3. Tertiary Serial Interface/USB Interface ................................................................. 11
5. RF Front End Design ........................................................................................... 12
5.1. RF Signal Requirements ........................................................................................ 13
5.2. GPS/Glonass Antenna Polarization ........................................................................ 14
5.3. GPS/Glonass Antenna Gain .................................................................................... 14
5.4. System Noise Floor ................................................................................................ 15
5.5. Active versus Passive Antenna ............................................................................... 15
5.6. RF Trace Losses ..................................................................................................... 16
5.7. External LNA Gain and Noise Figure ..................................................................... 16
5.8. Powering the External LNA (active antenna) ......................................................... 17
5.9. RF Interference ...................................................................................................... 18
5.10. Shielding .............................................................................................................. 18
6. Reference Designs .............................................................................................. 19
SL869 Hardware User Guide
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6.1. UART Interface ....................................................................................................... 19
6.1.1. Host Serial Interface ..................................................................................................... 20
6.2. UART Interface ....................................................................................................... 21
7. Advanced Features ............................................................................................. 22
7.1. CW Jamming Detection .......................................................................................... 22
7.2. SBAS ....................................................................................................................... 22
7.3. DGPS ....................................................................................................................... 22
8. Handling and soldering ....................................................................................... 23
8.1. Moisture Sensitivity ................................................................................................ 23
8.2. ESD ......................................................................................................................... 24
8.3. Reflow ..................................................................................................................... 24
8.4. Assembly Issues ..................................................................................................... 25
9. PCB Layout Details ............................................................................................. 26
10. Safety Recommendations .................................................................................... 27
11. Document History ............................................................................................... 28
SL869 Hardware User Guide
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1. Introduction
1.1. Scope
The Jupiter SL869 is a 12.2mm by 16.0mm integrated GPS/Glonass receiver module using a
state of the art 32-channel multi-constellation receiver. This document expands upon the
product specification to highlight particular areas to allow the hardware engineer to achieve a
successful design implementation. This document only covers the standard and timing
variants of the SL869. A separate hardware user guide is provided for the DR variant of the
SL869.
1.2. Audience
This document is intended for helping customer in the integration of the Telit SL869
GPS/Glonass module
1.3. Contact Information, Support
For general contact, technical support, to report documentation errors and to order manuals,
contact Telit Technical Support Center (TTSC) at:
TS-EMEA@telit.com
TS-NORTHAMERICA@telit.com
TS-LATINAMERICA@telit.com
TS-APAC@telit.com
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
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.
SL869 Hardware User Guide
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1.4. Document Organization
“Chapter 1: “Introduction” provides a scope for this document, target audience, contact and
support information, and text conventions.
“Chapter 2: “Powering the SL868” gives an overview about power supply.
“Chapter 3: “Updating Firmware” describes the SW updating procedure for Flash version.
“Chapter 4: “Serial interface” describes the three serial interfaces.
“Chapter 5: “RF Front End Design” describes in details the characteristics of the Front end.
“Chapter 6: “Reference Design” gives an overview about the reference design.
“Chapter 7: “Handling and soldering” describes packaging and soldering of the module.
“Chapter 8: “PCB layout details” describes the mechanical design of the module.
“Chapter 9: “Safety recommendations” provides some safety recommendations that must be
followed by the customer in the design of the application that makes use of the SL868.
“Chapter 10: “Document History” describes the history of the present product.
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.
Tip or Information – The information provides advice and suggestions that may be useful
when integrating the module.
All dates are in ISO 8601 format, i.e. YYYY-MM-DD.
1.6. Related Documents
SL869 Product Description, 80405ST10105a
SL869 EVK User Guide, 1VV0301004
SL869 Software User Guide, 1VV0301002
SL869 Timing Software User Guide, 1VV0301094
SL869 Hardware User Guide
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2. Powering the SL869
2.1. 3.3V Supply Voltage
The SL869 is powered by applying 3.3 volts DC to the VCC_IN pin of the module. Internal
linear and switching regulators generate all of the necessary internal voltages for the module.
The supply voltage must be within specification (3.3 volts DC ± 0.3 volts) within 10
milliseconds of initial application. Slow ramping up of the main supply voltage may cause the
SL869 not to start up.
Figure 1 VCC_IN Ramp
The powerup sequence must not be interrupted during the first second or the module may fail
to start up. In many designs, an LDO with enable driven by a host microcontroller is used to
provide main power to the SL869. Make sure that during initial startup of the host
microcontroller the LDO enable line is maintained at the proper state. Many microcontrollers
set GPIO lines to tri-state or input during initial bootup. If an LDO enable is tied to this
GPIO, it is possible for the LDO to turn on during the boot process and then be shut down.
This can cause the SL869 to fail to initialize properly. If this happens, a full power cycle of
both VCC_IN and VBATT would be required on the SL869.
2.2. Battery Back-up
VBATT is applied to the module to keep the RTC running and battery backed RAM alive
whenever main power is removed. This allows for faster startup upon reapplication of main
power.
Internal diode OR’ing provides an internal source for VBATT even if this pin is not used.
The internal reset of the SL869 is generated upon removal and reapplication of VBATT, not
VCC_IN. If the module does not initialize properly due to improper application of VCC_IN,
the module can only be reset if both supplies are removed and then reapplied in the proper
manner.
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