User's Manual

SIM900B Hardware Design
Table Index
TABLE 1: RELATED DOCUMENTS............................................................................................................................... 8
TABLE 2: TERMS AND ABBREVIATIONS ................................................................................................................... 8
TABLE 3: SIM900B KEY FEATURES ........................................................................................................................... 13
TABLE 4: CODING SCHEMES AND MAXIMUM NET DATA RATES OVER AIR INTERFACE ............................ 15
TABLE 5: PIN DESCRIPTION ....................................................................................................................................... 18
TABLE 6: OVERVIEW OF OPERATING MODES........................................................................................................ 21
TABLE 7: PIN DEFINITION OF THE SERIAL INTERFACES .................................................................................... 31
TABLE 8: LOGIC LEVELS OF THE SERIAL PORT AND DEBUG PORT ................................................................. 32
TABLE 9: PIN DEFINE OF THE AUDIO INTERFACE ................................................................................................ 35
TABLE 10: MIC INPUT CHARACTERISTICS ............................................................................................................. 38
TABLE 11: AUDIO OUTPUT CHARACTERISTICS .................................................................................................... 38
TABLE 12: BUZZER OUTPUT CHARACTERISTICS ................................................................................................. 39
TABLE 13: PIN DEFINE OF THE SIM INTERFACE.................................................................................................... 40
TABLE 14: PIN DESCRIPTION (AMPHENOL SIM CARD HOLDER) ...................................................................... 42
TABLE 15: PIN DESCRIPTION (MOLEX SIM CARD HOLDER) .............................................................................. 43
TABLE 16: PIN DEFINE OF THE LCD INTERFACE................................................................................................... 44
TABLE 17: PIN DEFINE OF THE KEYPAD INTERFACE........................................................................................... 44
TABLE 18: ADC SPECIFICATION ................................................................................................................................45
TABLE 19: BEHAVIOURS OF THE RI.......................................................................................................................... 46
TABLE 20: WORKING STATE OF THE NETLIGHT ................................................................................................... 47
TABLE 21: PIN DEFINE OF THE GPIO INTERFACE ................................................................................................. 48
TABLE 22: SIM900B CONDUCTED RF OUTPUT POWER........................................................................................ 50
TABLE 23: SIM900B CONDUCTED RF RECEIVE SENSITIVITY ............................................................................ 50
TABLE 24: SIM900B OPERATING FREQUENCIES.................................................................................................... 50
TABLE 25: ABSOLUTE MAXIMUM RATINGS........................................................................................................... 51
TABLE 26: SIM900B OPERATING TEMPERATURE .................................................................................................. 51
TABLE 27: SIM900B POWER SUPPLY RATINGS....................................................................................................... 51
TABLE 28: SIM900B CURRENT CONSUMPTION（VBAT=3.8V） ......................................................................... 52
TABLE 29: THE ESD ENDURE STATUE MEASURED TABLE (TEMPERATURE: 25℃, HUMIDITY:45% ) ........ 53
TABLE 30: PIN ASSIGNMENT...................................................................................................................................... 61
SIM900B_HD_V1.03 24.06.2010
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