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[ARM] SIM908 Voltage Requirements

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joel george

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Hiiii,
Im working on sim908 and wanted to know if 9V supply with 1Amp is okay???
i earlier had used adapter wid ratings of 12V bt the modem used to heat up very quickly....so is 9v okay???Also i checked wid 5V ....the leds wer not glowing much....

pls help me or else i myt burn up dis modem tooo
 

The power supply to the modem module is specified as 3.2 to 4.8 V. You surely don't want to supply 9 or 12 V directly to the module.

The reference circuit in the hardware manual uses a LM2596-ADJ switching regulator in front of the module.
 

Attention peak current of SIM900 is 2A
 

The power supply to the modem module is specified as 3.2 to 4.8 V. You surely don't want to supply 9 or 12 V directly to the module.

The reference circuit in the hardware manual uses a LM2596-ADJ switching regulator in front of the module.

but den wen i gv it 5v it was not working well.....doesnt the modem convert the gvn 9v to 3.2-4.8v???
 

i was asking wat voltage to be supplied to the entire modem....not the module.....
 

SIM908 is a module, not a modem. Which modem are you asking about?
 

I'm sure there will be a user manual or datasheet, too.
 

The picture has a USB socket and if that is the only power connection then the input voltage is 5 Volts.

Cheers.
 

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