GTA02 Power Glitch Reason Found
andy at openmoko.com
Fri Feb 15 09:36:13 CET 2008
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Somebody in the thread at some point said:
> Dear all:
> We have some discussion on this issue.
> In A5, we decide to rework a 4.7uF 10V capacitor on VB_SYS.
> In A6, we will change the PCB and add a 22uF 10V capacitor on VB_SYS.
Hi Allen -
Did these discussions include NXP opinion in the loop?
I found that 1uF (I tried it initially) was enough to make a big
difference in HF noise stability on VB_SYS and to deal with short
droops, so 4.7uF doesn't sound completely crazy to me. But it is quite
a difference from 22uF recommended by NXP.
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