date and GPS related questions

Joerg Reisenweber joerg at
Sun Mar 15 16:51:23 CET 2009

Am So  15. März 2009 schrieb Fernando Martins:
> Daniel, many thanks for your replies, please see below.
> Daniel Willmann wrote:
> > Hello,
> >
> > On Thu, 12 Mar 2009 22:19:05 +0100
> > Fernando Martins <fernando at> wrote:
> >
> >   
> > there is a backup battery, but in my experience it only takes a couple
> > hours without battery until the time is lost again.
> >
> >   
> I never leave the battery out, I only take it out to reboot after a crash.
> But now I wonder: usually I keep the phone switched off during the 
> night, and since I use it rarely, sometimes I forget it switched off at 
> home. Is it the case that, when FR is switched off, the main battery 
> does not feed the backup battery? (yeah it sounds weird, the main 
> battery would become the backup of the backup battery).

From PCF50633 PMU datasheet it seems backup bat isn't used as long as main 
battery is supplying sufficient voltage, no matter whether phone switched off 
or not.
So backup bat is the backup for main bat, not vice versa ;-)
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