[gta02-core] PMU review
alvieboy at alvie.com
Fri Jul 31 10:18:13 CEST 2009
Rene Harder wrote:
> Finally, I found some time to do the PMU review.
> So far, the PMU sheet looks very nice. I didn't really find much to
> complain about, just a few things.
:) That is indeed good news.
> In the KEEPACT line there supposed to be a test point TP1703. Although
> with ecn0007 this test point might gets removed as well.
> In the gta02 schematic BAT_ID on the battery connector is an output and
> not an input as we defined it. However I checked the smart battery
> circuit  and there BAT_ID is connected to the HDQ port of the coulomb
> counter which is a bidi communication port . If we stick to the same
> battery pack and do not plan on replacing it, it does not make any sense
> to keep the possibility of connecting BAT_ID to the BATTEMP port of the
> PMU controller (which is an analog input). Only if we plan on getting a
> more simple battery pack with ID or TEMP resistor this connection would
> be necessary.
> So we could get rid of R1769 (NC) to save some space on the board for
> other stuff.
There are lots of "legacy" alternative paths. I think we should review them and maybe remove some (like those in GPS).
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