No battery Vsys issue is USB overcurrent?

Joerg Reisenweber joerg at
Mon Jun 30 17:10:15 CEST 2008

Am Mo  30. Juni 2008 schrieb Andy Green:
> Somebody in the thread at some point said:
> | I didn't see why it shouldn't be coincidence.  The fact is we get a 30us
> | dropout on Vsys, keep adding caps you can stop it dipping below a
> | critical level in the 30us.  If you want to talk coincidence ;-) there
> | is a third great story to explain it that didn't pan out: 30us is a
> | commonly used filter period in pcf50633 and is also the duration of the
> Of course 30us ~= 1/32kHz, we're saying it's for "one pcf clock" that
> Vsys is disrupted -- probably highly significant if we can figure out why.
> -Andy

So to proof this, you might change the RTC-crystal freq? Just an idea.  

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