Table Of Contents; Contents - SimCom SIM802 HD Manual

SIM802 Hardware Design

Contents

Contents ........................................................................................................................................... 3
Version history................................................................................................................................. 8
1 Introduction................................................................................................................................... 9
1.1 Related documents .............................................................................................................. 9
1.2 Terms and abbreviations.................................................................................................... 10
1.3 Safety caution.................................................................................................................... 12
2 Product concept........................................................................................................................... 14
2.1 SIM802 key features at a glance ....................................................................................... 15
2.2 SIM802 functional diagram .............................................................................................. 17
2.3 SIM802 evaluation board .................................................................................................. 18
3 Application interface................................................................................................................... 19
3.1 SIM802 Pin description..................................................................................................... 19
3.2 Operating modes ............................................................................................................... 23
3.3 Power supply..................................................................................................................... 24
3.3.1 Power supply pins ................................................................................................... 25
3.3.2 Minimizing power losses......................................................................................... 26
3.3.3 Monitoring power supply ........................................................................................ 26
3.4 Power up/down scenarios.................................................................................................. 26
3.4.1 Turn on SIM802 ...................................................................................................... 26
3.4.2 Turn off SIM802 ..................................................................................................... 29
3.5 Charging interface ............................................................................................................. 32
3.5.1 Battery pack characteristics..................................................................................... 33
3.5.2 Recommended battery pack .................................................................................... 34
3.5.3 Implemented charging technique............................................................................. 34
3.5.4 Operating modes during charging ........................................................................... 35
3.5.5 Charger requirements .............................................................................................. 36
3.6 Power saving ..................................................................................................................... 36
3.6.1 Minimum functionality mode.................................................................................. 37
3.6.2 GSM Sleep mode (slow clocking mode)................................................................. 37
3.6.3 SRD sleep mode (slow clocking mode) .................................................................. 38
3.6.4 Wake up SIM802 from GSM sleep mode ............................................................... 38
3.7 Summary of state transitions (except sleep mode) ............................................................ 38
3.8 RTC backup....................................................................................................................... 39
3.9 Serial interfaces................................................................................................................. 43
3.9.1 Main serial port and Debug serial port supporting .................................................. 44
3.9.2 GSM part software upgrade and software debug .................................................... 45
3.10 Audio interfaces .............................................................................................................. 47
3.10.1 Speaker interface configuration............................................................................. 48
3.10.2 Microphone interfaces configuration..................................................................... 49
3.10.3 Referenced electronic characteristic...................................................................... 49
SIM802_HD_V2.01
3
12.01.2010