[ARM] SIM908 Voltage Requirements

[joel george]

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

 

[FvM]

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.

 

[asrock70]

Attention peak current of SIM900 is 2A

 

[joel george]

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???

 

[joel george]

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

 

[FvM]

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

 

[joel george]

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

heres the link to the image of the modem...
https://obrazki.elektroda.pl/9762782700_1412003355.jpg

 

[FvM]

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

 

[Batang]

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

Cheers.