[Bug 212] Charging seems completely broken
bugzilla-daemon at bugzilla.openmoko.org
bugzilla-daemon at bugzilla.openmoko.org
Sat Mar 10 21:10:48 CET 2007
http://bugzilla.openmoko.org/cgi-bin/bugzilla/show_bug.cgi?id=212
------- Additional Comments From cworth at cworth.org 2007-03-10 21:10 -------
Harald wrote:
> 1) the PMU decides that the battery voltage is high enough to boot
> 2) it switches on the CPU, which in turn switches on various peripherals, most
> notably high-power peripherals such as backlight
> 3) due to the high current draw, the battery voltage decreases below the
> threshold of the PMU
...
> a) we could set a higher Vlowbat (minimum battery voltage) threshold. This
> sucks because we would shut down the phone even before the battery is empty.
So is this just a case of missing hysteresis? That is, is there a single
threshold value that is being examined in steps 1 and 3 above? If so, could the
answer be as simple as using separate values and raising the value for step 1
while leaving the value for step 3 where it is?
-Carl
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