[Tinkerphones] Status GTA04A5

joerg Reisenweber joerg at openmoko.org
Thu Mar 16 22:55:17 CET 2017

On Thu 16 March 2017 22:31:33 joerg Reisenweber wrote:
> For a way more
> thorough test, the charger circuit in TWL4030 should get switched off prior
> to voltage test (if possible, I don't have the TRM at hand, with the
> register specs) 


To reduce leakage in the backup battery charger after charging completes, 
software can measure
VBACKUP using the MADC conversion. If VBACKUP has reached the desired voltage, 
**the backupmodule can be disabled by setting the BBCHEN bit to 0**.

BBSEL=11 (or whatever the polyacene allows)
wait unitl VBAT > 2V8
wait 2 seconds
Then  check the actual voltage doesn't drop to 2V5 in an instant. 
(Delay time 2 seconds is a ballpark random number)


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