date and GPS related questions
fernando at cmartins.nl
Sun Mar 15 19:26:55 CET 2009
Joerg Reisenweber wrote:
> Am So 15. März 2009 schrieb Fernando Martins:
>> Daniel, many thanks for your replies, please see below.
>> Daniel Willmann wrote:
>>> On Thu, 12 Mar 2009 22:19:05 +0100
>>> Fernando Martins <fernando at cmartins.nl> 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 ;-)
Uff, I was getting all confused with these batteries back and forth :-)
I never let the main battery drain fully, so something else has caused
the date to reset.
BTW, I was also curious whether the backup battery recharge itself, and
from the datasheet above it seems to be the case.
I still remember the old times where I had to replace batteries in PC
motherboards. Nowadays motherboards dye before the battery :-)
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