M12 Hardware Design
M12_Hardware_Design_V3.3 - 3 -
3.10. SIM card interface ........................................................................................................... 50
3.10.1. SIM card application ............................................................................................. 50
3.10.2. SIM card holder ..................................................................................................... 52
3.11. ADC ................................................................................................................................. 54
3.12. Behaviors of the RI ......................................................................................................... 55
3.13. Network status indication ................................................................................................ 57
3.14. Operating status indication .............................................................................................. 58
3.15. General purpose input & output (GPIO) ......................................................................... 58
3.16. SD card interface ............................................................................................................. 59
4. Antenna interface ........................................................................................................................ 61
4.1. Antenna installation ........................................................................................................... 61
4.2. RF output power ................................................................................................................ 62
4.3. RF receiving sensitivity ..................................................................................................... 62
4.4. Operating frequencies ....................................................................................................... 62
4.5. Recommendation of RF pad welding ................................................................................ 62
5. Electrical, reliability and radio characteristics ............................................................................ 64
5.1. Absolute maximum ratings ................................................................................................ 64
5.2. Operating temperature ....................................................................................................... 64
5.3. Power supply ratings ......................................................................................................... 65
5.4. Current consumption ......................................................................................................... 66
5.5. Electro-static discharge ..................................................................................................... 67
6. Mechanical dimensions ............................................................................................................... 68
6.1. Mechanical dimensions of the module .............................................................................. 68
6.2. Footprint of recommendation ............................................................................................ 70
6.3. Top view of the module .................................................................................................... 72
6.4. Bottom view of the module ............................................................................................... 72
Appendix A: GPRS coding schemes ............................................................................................... 73
Appendix B: GPRS multi-slot classes............................................................................................. 74
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