hardware design v2.00

Smart Machine Smart Decision
SIM908_Hardware Design_V2.00 2012.05.07
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4.8.1 SIM Card Application......................................................................................................................... 33
4.8.2 Design Considerations for SIM Card Holder...................................................................................... 34
4.9 LCD Display/SPI Interface..................................................................................................................... 36
4.10 Keypad Interface .................................................................................................................................... 36
4.11 ADC........................................................................................................................................................ 37
4.12 RI Behaviors........................................................................................................................................... 37
4.13 Network Status Indication ...................................................................................................................... 38
4.14 General Purpose Input/Output (GPIO) ................................................................................................... 39
4.15 PWM ...................................................................................................................................................... 39
4.16 I
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C Bus.................................................................................................................................................... 39
4.17 GSM Antenna Interface.......................................................................................................................... 40
5 GPS Application Interface ............................................................................................................................. 41
5.1 GPS Operating Modes............................................................................................................................ 41
5.2 GPS Power on/down Scenarios .............................................................................................................. 42
5.2.1 Power on GPS engine.......................................................................................................................... 42
5.2.2 Power down GPS engine..................................................................................................................... 42
5.3 GPS-VANT-OUT and GPS-VANT-IN .................................................................................................. 42
5.4 GPS Antenna Interface ........................................................................................................................... 42
5.4.1 GPS Antenna Interface........................................................................................................................ 42
5.4.2 GPS Antenna Choice Consideration ................................................................................................... 43
6 Electrical, Reliability and Radio Characteristics......................................................................................... 44
6.1 Absolute Maximum Ratings................................................................................................................... 44
6.2 Recommended Operating Conditions..................................................................................................... 44
6.3 Digital Interface Characteristics ............................................................................................................. 44
6.4 SIM Card Interface Characteristics ........................................................................................................ 45
6.5 VDD_EXT Characteristics ..................................................................................................................... 45
6.6 SIM_VDD Characteristics...................................................................................................................... 45
6.7 VRTC Characteristics............................................................................................................................. 45
6.8 Current Consumption (VBAT = 3.8V, GPS engine is powered down)................................................... 46
6.9 Electro-Static Discharge ......................................................................................................................... 47
6.10 Radio Characteristics.............................................................................................................................. 47
6.10.1 Module RF Output Power................................................................................................................ 47
6.10.2 Module RF Receive Sensitivity ....................................................................................................... 49
6.10.3 Module Operating Frequencies........................................................................................................ 49
6.11 Module label information ....................................................................................................................... 49
Appendix ................................................................................................................................................................ 51
A. Related Documents.......................................................................................................................................... 51
B. Terms and Abbreviations ................................................................................................................................. 52
C. Safety Caution ................................................................................................................................................. 53