Download SL869 Hardware User Guide

SL869 Hardware User Guide
1vv0301001 Rev.2 –
2013-12-7
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. 6. Shielding.............................................................................................................. 18 Reference Designs .............................................................................................. 19 Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
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