[Gta04-owner] GTA04 power management.

[Dr. Michael Lauer]

>> Can you give a pointer to the OPTION GSM module and why it drains battery 
>> although the device is off?
> 
> The Option module has a low-power mode where it still is capable to
> receive incoming SMS and answer phone calls and wake up the CPU
> to do appropriate actions.
> 
> This drains between 3 and 10 mA in average (resulting in up to
> 400 h at 1200 mAh).
> 
> In suspend mode this is not only ok but required.
> 
> If the phone is completely off, it should be 0 mA. But there is a hardware
> bug in the GTA04A3 board that prevents that the modem can be completely
> powered off after it was initialized once. Only removing the battery for a
> short moment will reset this state.

From what I know, modems that are connected to the battery directly
need to feature a command that powers them completely off. In case of the
freerunner it's AT at POFF, in case of the Option I would have thought it
to be AT$QCPWRDN, but that just toggles a power-cycle instead.

Cheers,

:M: