On Thu 16 March 2017 23:18:20 Andreas Kemnade wrote: > > That's probably a problem here: even an unsoldered polyacene cap would > > leave the charger circuit with a - however minimal - capacity vs GND, so > > it would charge up very quickly and for sure reach nominal voltage. 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) or alternatively RTC get checked if it has > > a "power failed" flag set, or keeps time, after brief removal of main > > power supply > > > > > > I don't think so. The charger will oscillate. Here is a measurement > result of probably such a situation: > root@gta04:~# for i in 1 2 3 4 5 6 7 8 ; do > cat /sys/bus/iio/devices/iio\:device1/in_voltage9_input ; sleep 1 ; > done 3030 2863 > 3431 > 3466 > 3382 > 2727 > 3316 > 3171 > > Regards, > Andreas
Yes, the TRM suggests that too:
>>
With this configuration, the backup battery starts charging automatically when
VBAT > 3.2 V and VBAT >
VBACKUP. Backup battery charging automatically stops when VBACKUP reaches the
specified BBSEL
voltage.
<<
(however neither is in contradiction to what I said above)
could you run a
for (( i=0; i<100; i++ )); do
cat /sys/bus/iio/devices/iio\:device1/in_voltage9_input
done
instead? (no sleep)
I'd also be interested in state of BBCHEN and the way in_voltage9_input.get()
works - note how the TRM also suggests a A/D conversation on ADIN9 needs
BBCHEN=1 to connect the voltage divider and analog input to the battery, I
wonder if and how the *.get() does that, if at all.
/j
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