[Bug 762] GTA01v4 Only Charges at 40ma

bugzilla-daemon at bugzilla.openmoko.org bugzilla-daemon at bugzilla.openmoko.org
Wed Sep 19 17:41:10 CEST 2007


------- Additional Comments From wally.ritchie at gmail.com  2007-09-19 17:41 -------
Well 43ma is about 40ma not 50ma. In any case the charge current when
not-enumerated should by your design be 100ma not 50ma. Looking at the pcf50606
data sheet, it may be simply CURRAT in MBCC3 remains at its default of 0.1 *
Ifast where it should probably be set to 0.2 to produce a 100ma precharge
instead of 50ma.

The reset value is probably appropriate for Ifast of 1C but the nominal charge
on the GTA01v4 appears to be closer to 0.5C. 

Assuming that the standby battery battery is connected to the pcf50606,
reprogramming CURRAT to 0.2*Ifast should allow precharge at 100ma. This will
at least halve the time from dead to u-bootable and halve the time to charge
without enumerating. 

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