GTA02 Power Glitch Reason Found

Andy Green andy at openmoko.com
Tue Feb 5 11:52:48 CET 2008


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Somebody in the thread at some point said:
>> This net experiences a great deal of glitching and noise from the
>> missing decoupling, an example during boot is attached (which didn't
>> crash the thing!).  This will easily explain all the crazy shutdown
>> behaviours.
> 	Greeeeeeat. I'll have this rework to try the charging logic. 
> 	Previously, GTA02 would shutdown occasionally when inserting USB wall
> charger. Maybe this rework could fix this issue. 

Its possible something else goes on with that issue additionally, but
for sure now the #1 suspect for any random shutdown failure we have ever
seen is the VB_SYS decoupling issue.  If we're lucky a whole class of
troubling, hard to pin down power instability scenarios will just go
away now.

- -Andy
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