SimCom SIM900B Hardware Design page 4

3.12 Network Status Indication ...................................................................................................................... 31
3.13 General Purpose Input/Output (GPIO) ................................................................................................... 32
3.14 Keypad Interface .................................................................................................................................... 32
3.15 Buzzer..................................................................................................................................................... 33
4 Electrical, Reliability and Radio Characteristics......................................................................................... 34
4.1 Absolute Maximum Ratings................................................................................................................... 34
4.2 Recommended Operating Conditions..................................................................................................... 34
4.3 Digital Interface Characteristics ............................................................................................................. 34
4.4 SIM Card Interface Characteristics ........................................................................................................ 34
4.5 SIM_VDD Characteristics...................................................................................................................... 35
4.6 VRTC Characteristics ............................................................................................................................. 35
4.7 Current Consumption (VBAT = 3.8V) ................................................................................................... 35
4.8 Electro-Static Discharge ......................................................................................................................... 36
4.9 Radio Characteristics.............................................................................................................................. 37
4.9.1 Module RF Output Power ................................................................................................................... 37
4.9.2 Module RF Receive Sensitivity........................................................................................................... 38
4.9.3 Module Operating Frequencies ........................................................................................................... 39
5 Manufacturing ................................................................................................................................................ 40
5.1 Mechanical Dimensions of SIM900B .................................................................................................... 40
5.2 Mounting SIM900B onto the application platform ................................................................................ 41
5.3 Board-to-board connector....................................................................................................................... 41
5.4 Mechanical dimensions of the RUNFENG BB530-06001-20R............................................................. 42
5.5 RF connector .......................................................................................................................................... 43
5.6 Top and Bottom View of the SIM900B .................................................................................................. 44
5.7 PIN Assignment of SIM900B................................................................................................................. 45
Appendix ................................................................................................................................................................ 46
A. Related Documents.......................................................................................................................................... 46
B. Terms and Abbreviations ................................................................................................................................. 47
C. Safety Caution ................................................................................................................................................. 48
SIM900B_Hardware Design_V2.01
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Smart Machine Smart Decision
2012-05-07