Hardware Interface Description - KORE Telematics

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XT55/56 Hardware Interface Description Confidential / Released s 3.7 Summary of state transitions (except SLEEP mode)...........................................53 3.8 RTC backup for GSM part of XT55/56.................................................................54 3.9 Serial interfaces of the XT55/56 GSM part ..........................................................55 3.9.1 Features supported on the first serial interface of GSM part (ASC0) ....55 3.9.2 Features supported on the second serial interface of GSM part (ASC1)...................................................................................56 3.9.3 ASC0 and ASC1 configuration...............................................................56 3.10 Audio interfaces ...................................................................................................57 3.10.1 Microphone circuit..................................................................................58 3.10.2 Speech processing ................................................................................59 3.10.3 DAI timing ..............................................................................................59 3.11 SIM interface........................................................................................................61 3.11.1 Requirements for using the GSM_CCIN pin ..........................................62 3.11.2 Design considerations for SIM card holder............................................63 3.12 Control signals .....................................................................................................64 3.12.1 Inputs .....................................................................................................64 3.12.2 Outputs ..................................................................................................65 3.12.2.1 Synchronization signal...........................................................65 3.12.2.2 Using the GSM_SYNC pin to control a status LED ...............66 3.12.3 Behavior of the GSM_RING0 line (ASC0 interface only).......................68 4 GPS application interface...........................................................................................70 4.1 Theory of operation..............................................................................................70 4.2 Technical data .....................................................................................................71 4.3 GPS operating modes .........................................................................................72 4.3.1 Trickle Power mode ...............................................................................73 4.3.2 Comparison of Trickle Power and Push-to-Fix mode ............................74 4.4 Power supply of the XT55/56 GPS part...............................................................75 4.5 General purpose input/output ..............................................................................75 4.6 Serial interfaces of the XT55/56 GPS part...........................................................76 4.7 GPS control signals .............................................................................................76 4.8 Receiver architecture...........................................................................................77 4.9 Operation procedure............................................................................................78 4.10 Start-up procedures .............................................................................................79 4.10.1 Coldstart.................................................................................................79 4.10.2 Warmstart ..............................................................................................79 4.10.3 Hotstart ..................................................................................................79 5 GSM and GPS antenna interfaces .............................................................................80 5.1 GSM antenna installation.....................................................................................80 5.1.1 GSM antenna connector........................................................................80 5.1.2 GSM antenna pad..................................................................................82 5.2 Installing the GPS antenna ..................................................................................82 5.3 Hirose antenna connector....................................................................................83 6 Electrical, reliability and radio characteristics.........................................................87 6.1 Absolute maximum ratings ..................................................................................87 6.2 Operating temperatures.......................................................................................87 6.3 Pin description .....................................................................................................89 6.4 Power supply ratings ...........................................................................................95 6.4.1 Current consumption during GSM transmit burst...................................97 6.5 Electrical characteristics of the voiceband part..................................................102 6.5.1 Setting audio parameters by AT commands........................................102 6.5.2 Audio programming model...................................................................103 6.5.3 Characteristics of audio modes............................................................104 XT55/56_hd_v02.06a Page 4 of 125 17.12.2004
XT55/56 Hardware Interface Description Confidential / Released s 6.5.4 Voiceband receive path .......................................................................105 6.5.5 Voiceband transmit path ......................................................................106 6.6 Air interface of the XT55/56 GSM part...............................................................107 6.7 Electrostatic discharge.......................................................................................108 6.8 Reliability characteristics ...................................................................................109 7 Mechanics..................................................................................................................110 7.1 Mechanical dimensions of XT55/56...................................................................110 7.2 Mounting XT55/56 onto the application platform ...............................................112 7.3 Board-to-board connector..................................................................................114 8 Reference approval...................................................................................................116 8.1 Reference equipment for type approval.............................................................116 8.2 Compliance with FCC Rules and Regulations (XT55 only) ...............................117 8.3 Compliance with FCC Rules and Regulations (XT56 only) ...............................118 9 Example applications ...............................................................................................119 10 List of parts and accessories...................................................................................123 XT55/56_hd_v02.06a Page 5 of 125 17.12.2004
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