[gta02-core] LCM review

Werner Almesberger werner at openmoko.org
Fri Jul 24 07:54:01 CEST 2009

Rene Harder wrote:
> I also found that the capacitor C6005 in our drawing has the values
> 100nF but is NC in the GTA02 and not existing in GTA01. Is there any
> particular reason for this which I'm not aware of? Neither could I find
> any ECN regarding this change.

Looks like a bug, yes. C6005 has an interesting history. It was 47 pF
in GTA02v5 and became NC in GTA02v6. From the GTA02 and GTA03 lists:

Andy, 15 May 2008:  p7  C6005 should be 47p again?
Allen, 19 May 2008:  No! I will remove it.
Allen, 02 Jul 2008:  7.[...] and add C6004 and C6005
Andy, 20 Aug 2008:
| But, I recall there was talk about "destroy PMU" about C6005 six months
| ago.  This was simply 47p on -ve side of LED.  Nobody explained why 47p
| there can "destroy PMU".

Maybe it would upset the feedback loop. In any case, we should make it
NC, as in later GTA02 versions and GTA03-6410.

- Werner

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