SIM900 데이터 시트보기 (PDF) - Unspecified

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SIM900

SIM900 Quad-band/SIM900A Dual-band GSM/GPRS module

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SIM900 Hardware Design

Figure Index

FIGURE 1: SIM900A FUNCTIONAL DIAGRAM......................................................................................................... 15

FIGURE 2: TOP VIEW OF SIM900A EVB .................................................................................................................... 16

FIGURE 3: REFERENCE CIRCUIT OF THE VBAT INPUT ........................................................................................ 21

FIGURE 4: REFERENCE CIRCUIT OF THE SOURCE POWER SUPPLY INPUT..................................................... 22

FIGURE 5: VBAT VOLTAGE DROP DURING TRANSMIT BURST........................................................................... 22

FIGURE 6: TURN ON SIM900A USING DRIVING CIRCUIT..................................................................................... 24

FIGURE 7: TURN ON SIM900A USING BUTTON ...................................................................................................... 24

FIGURE 8: TIMING OF TURN ON SYSTEM USING PWRKEY ................................................................................ 24

FIGURE 9: TURN ON SIM900A USING DRIVING CIRCUIT..................................................................................... 25

FIGURE 10: TURN ON SIM900A USING BUTTON .................................................................................................... 25

FIGURE 11: TIMING OF TURN ON SYSTEM USING PWRKEY AND PWRKEY_OUT ......................................... 26

FIGURE 12: TIMING OF TURN OFF SYSTEM USING PWRKEY............................................................................. 27

FIGURE 13: TIMING OF TURN OFF SYSTEM USING PWRKEY AND PWRKEY_OUT........................................ 27

FIGURE 14: TIMING OF RESTART SYSTEM ............................................................................................................. 29

FIGURE 15: STATE TRANSITION ................................................................................................................................ 30

FIGURE 16: RTC SUPPLY FROM NON-CHARGEABLE BATTERY ......................................................................... 30

FIGURE 17: RTC SUPPLY FROM RECHARGEABLE BATTERY .............................................................................. 31

FIGURE 18: RTC SUPPLY FROM CAPACITOR .......................................................................................................... 31

FIGURE 19: SEIKO XH414H-IV01E CHARGE CHARACTERISTIC ......................................................................... 31

FIGURE 20: CONNECTION OF THE SERIAL INTERFACES..................................................................................... 33

FIGURE 21: CONNECTION OF SOFTWARE UPGRADE AND SOFTWARE DEBUG ............................................. 34

FIGURE 22: RS232 LEVEL CONVERTER CIRCUIT................................................................................................... 35

FIGURE 23: SPEAKER INTERFACE CONFIGURATION ........................................................................................... 36

FIGURE 24: SPEAKER INTERFACE WITH AMPLIFIER CONFIGURATION .......................................................... 36

FIGURE 25: MICROPHONE INTERFACE CONFIGURATION................................................................................... 37

FIGURE 26: EARPHONE INTERFACE CONFIGURATION........................................................................................ 37

FIGURE 27: REFERENCE CIRCUIT OF THE 8 PINS SIM CARD.............................................................................. 39

FIGURE 28: REFERENCE CIRCUIT OF THE 6 PINS SIM CARD.............................................................................. 39

FIGURE 29: AMPHENOL C707 10M006 512 2 SIM CARD HOLDER........................................................................ 40

FIGURE 30: MOLEX 91228 SIM CARD HOLDER ...................................................................................................... 41

FIGURE 31: REFERENCE CIRCUIT OF THE KEYPAD INTERFACE ....................................................................... 43

FIGURE 32: ARCHITECTURE OF ADC ....................................................................................................................... 43

FIGURE 33: SIM900A SERVICES AS RECEIVER ....................................................................................................... 44

FIGURE 34: SIM900A SERVICES AS CALLER ........................................................................................................... 45

FIGURE 35: REFERENCE CIRCUIT OF NETLIGHT .................................................................................................. 46

FIGURE 36: RESET TIMING ......................................................................................................................................... 47

FIGURE 37: TOP AN SIDE MECHANICAL DIMENSIONS OF MODULE （UNIT: MM）.................................... 52

FIGURE 38：BOTTOM MECHANICAL DIMENSIONS OF MODULE （UNIT: MM）......................................... 53

FIGURE 39: RECOMMENDED PCB DECAL（UNIT: MM） .................................................................................... 53

FIGURE 40: TOP VIEW OF THE SIM900A .................................................................................................................. 54

FIGURE 41: SIM900A PIN OUT DIAGRAM (TOP VIEW) .......................................................................................... 55

FIGURE 42: THE RAMP-SOAK-SPIKE REFLOW PROFILE OF SIM900A............................................................... 57

SIM900_HD_V1.01

6

26.12.2009

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