SimCom SIM900D Hardware Design page 4

4.7.1 Speaker Interface Configuration ......................................................................................................... 32
4.7.2 Microphone Interfaces Configuration ................................................................................................. 32
4.7.3 Earphone Interface Configuration....................................................................................................... 33
4.7.4 Audio Electronic Characteristics......................................................................................................... 33
4.8 SIM Card Interface ................................................................................................................................. 34
4.8.1 SIM Card Application ......................................................................................................................... 34
4.8.2 Design Considerations for SIM Card Holder ...................................................................................... 35
4.9 LCD Display/SPI Interface..................................................................................................................... 37
4.10 ADC........................................................................................................................................................ 37
4.11 RI Behaviors........................................................................................................................................... 37
4.12 Network Status Indication ...................................................................................................................... 38
4.13 General Purpose Input/Output (GPIO) ................................................................................................... 39
4.14 PWM ...................................................................................................................................................... 39
4.15 Antenna Interface ................................................................................................................................... 40
5 Electrical, Reliability and Radio Characteristics......................................................................................... 41
5.1 Absolute Maximum Ratings................................................................................................................... 41
5.2 Recommended Operating Conditions..................................................................................................... 41
5.3 Digital Interface Characteristics ............................................................................................................. 41
5.4 SIM Card Interface Characteristics ........................................................................................................ 41
5.5 SIM_VDD Characteristics...................................................................................................................... 42
5.6 VRTC Characteristics ............................................................................................................................. 42
5.7 Current Consumption (VBAT = 3.8V) ................................................................................................... 42
5.8 Electro-Static Discharge ......................................................................................................................... 43
5.9 Radio Characteristics.............................................................................................................................. 44
5.9.1 Module RF Output Power ................................................................................................................... 44
5.9.2 Module RF Receive Sensitivity........................................................................................................... 45
5.9.3 Module Operating Frequencies ........................................................................................................... 46
6 Manufacturing ................................................................................................................................................ 47
6.1 Top and Bottom View of SIM900D ....................................................................................................... 47
6.2 Typical Solder Reflow Profile................................................................................................................ 47
Appendix ................................................................................................................................................................ 48
A. Related Documents.......................................................................................................................................... 48
B. Terms and Abbreviations ................................................................................................................................. 49
C. Safety Caution ................................................................................................................................................. 50
SIM900D_Hardware Design_V2.02
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Smart Machine Smart Decision
2012-05-07