hi,
we use BQ32000 and super cap as backup supply for the rtc.
On power cycling we observe the date and time getting reset in some cases.
we could also observe a drift in the rtc time, which varies from 1 or 2 minutes upto 50 to 60 minutes.
we found the time drift after a few hours of setting the RTC time properly and also we observed this time drift (sudden change in time upto a few minutes) immediately after a power cycle in some cases.
what can be the reason for this behavior of rtc time drift and the rtc getting reset.