[Fwd: Re: [gta02] Fwd: PS: high rate of broken devices even on prodction test. DESIGN BUG!]
andy at openmoko.com
Thu Apr 17 08:15:47 CEST 2008
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Somebody in the thread at some point said:
| Hi Werner:
| I set the MBCC7=3 (suspend) and MBCC8=0. I found the USB doesn't supply
| any current for GTA02.
| But I plug the USB power into GTA02, the PMU will change it's register
| status. The MBCC will change back "1".
| Can someone give me a SW which the MBCC always is "3"?
| Therefore, I can make the DC-DC output 5V and found what happen?
I don't understand how this can make the trouble we see... the switch
blows up not the boost converter. The switch won't mind if we give it
5V from the converter on Vin no matter what the load is from the PMU
side, even a short to 0V.
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