[gta02-core] PMU review

Álvaro Lopes alvieboy at alvie.com
Fri Jul 31 10:18:13 CEST 2009

Rene Harder wrote:
> Hi,
> Finally, I found some time to do the PMU review.

Fantastic :)

> 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 [1] and there BAT_ID is connected to the HDQ port of the coulomb 
> counter which is a bidi communication port [2]. 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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