SimCom SIM900 Series User manual

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P
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1.
2.
3.
4.
5.
6.
7.
State
Stand
b
Voice
C
Datac
a
SMS
URC
8.
I
NOUT: 
DCINJack: 
D
PowerEna
b
board.Whe
PowerIndi
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EXT‐EN: Ext
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circuit.
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leSwitch: T
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uzzer: Inco
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IResponse
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ePINisch
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

9. NetworkIndicatorLED:NetworkStatusIndicatorLED.
StateSIM900function

OffSIM900isnotrunning

64msOn/800msOffSIM900doesnotfindthenetwork

64msOn/3000msOffSIM900findthenetwork

64msOn/300msOffGPRScommunication


10. ADCandPWMPins:ADCandPWMPinsofSIM900A.(Referpage9,10forADCandPWM
commands)
11. AudioInterface:AudioPins(Speakerandmicrophonepins)ofSIM900/900A.
12. SIMInterface:SIMCardholderInterface.
13. Vout:Regulated4.2Voutputvoltageforexternalapplicationcircuit.

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

POWER
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A)
Step1:


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Step2:
another
Step3 :
I
Step4:
A
Step5:
N
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INGSIM900
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B)
Step1:
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Step4:
:
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N
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NOTE: 
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