User's Manual

SIM900B Hardware Design
3.12 LCD Display Interface ..............................................................................................................................44
3.13 Keypad Interface .......................................................................................................................................44
3.14 ADC ..........................................................................................................................................................45
3.15 Behaviors of the RI ...................................................................................................................................46
3.16 Network Status Indication.........................................................................................................................46
3.17 General Purpose Input Output (GPIO)......................................................................................................48
4 Antenna Interface ..................................................................................................................................................49
4.1 Module RF Output Power ...........................................................................................................................50
4.2 Module RF Receive Sensitivity...................................................................................................................50
4.3 Module Operating Frequencies ...................................................................................................................50
5 Electrical, Reliability and Radio Characteristics...................................................................................................50
5.1 Absolute Maximum Ratings........................................................................................................................50
5.2 Operating Temperatures..............................................................................................................................51
5.3 Power Supply Ratings .................................................................................................................................51
5.4 Current Consumption ..................................................................................................................................52
5.5 Electro-Static Discharge..............................................................................................................................53
6 Mechanics .............................................................................................................................................................55
6.1 Mechanical Dimensions of SIM900B .........................................................................................................55
6.2 Top View of the SIM900B ..........................................................................................................................56
6.3 Mounting SIM900B onto the application platform.....................................................................................57
6.4 Board-to-board connector ...........................................................................................................................57
6.4.1 Mechanical dimensions of the SUNCAGEY BB530-06001-20R.....................................................57
6.5 RF connector ...............................................................................................................................................59
6.6 PIN Assignment of SIM900B .....................................................................................................................61
SIM900B_HD_V1.03 24.06.2010
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