SIM340C problems with hardware reset

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Richi

Joined: 02 Nov 2007
Posts: 2

06 Nov 2007 17:33 sim340c

Hi guys, sorry for my english...I have a problems with SIM340C hardware reset. I have conected a SIM340C with a 8 bit microcontroller and manage POWERKEY and STATUS lines with I/O lines. But I never make a hardware reset, I try with several times in POWERKEY line, but I never detect a low level in STATUS line. Now if I send the AT command CPOWD ( software power-down ) the STATUS lines go to low level.
Thanks in advance !

sabeti_1990

Joined: 16 Nov 2007
Posts: 178
Helped: 11

09 Oct 2008 9:34 sim340c microcontroller

hi
maybe you configuration in micro's I/O is not correct
use npn transistor between module & micro , it's better Very Happy

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freko

Joined: 25 Sep 2008
Posts: 6

11 Oct 2008 1:05 Re: SIM340C problems with hardware reset

Hi, if you are use 5v to supply your microcontroller then you need a 5v in the pin you are sense the STATUS line, and the sim340 only supply 3.6v at STATUS line, use a transistor as sabeti say.