[Gta04-owner] uptime of rtc (unusual usage pattern)

NeilBrown neilb at suse.de
Mon Feb 11 22:33:20 CET 2013


On Mon, 11 Feb 2013 11:23:05 +0100 Christoph Mair <christoph.mair at gmail.com>
wrote:

> On Sun, Feb 10, 2013 at 11:17 PM, Neil Jerram <neil at ossau.homelinux.net> wrote:
> > "e.waelde" <ew.ng7125 at nassur.net> writes:
> >
> >> However, if I remove the battery for more than 12 h or so, the time on
> >> the device is back to 2000-01-01 00:00:00. I used to switch off the
> >> phone for maybe 2 weeks on average, but losing time annoys me.
> >
> > FWIW, on my phone I lose the real time if I remove the battery for more
> > than about 20 seconds.
> 
> Please note that the supercap is charged very slowly and it can take a
> long time until it is full. This can be configured at source level and
> the default is 0.5uA IIRC. Maybe we should increase this limit?

The TPS65950 allows to choose between
 25uA 150uA 500uA 1000uA

and will stop when the voltage gets to one of 
 2.5V 3.0V 3.1V 3.2V

These numbers can be set in the board file and are currently
	.bb_uvolt		= 3200000,
	.bb_uamp		= 150,


Where did you get the default of 0.5uA from?

NeilBrown
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