[Gta04-owner] GTA04 power management.

[NeilBrown]

On Sun, 25 Dec 2011 18:47:13 +0100 "Dr. Michael Lauer"
<mickey at vanille-media.de> wrote:

> >> 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.

I discovered that too.
I think it is actually turning the Option off, but something else is
immediately turning it on - presumably the fact that ON_KEY is tied low.

NeilBrown
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