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STM32F437 Vbat failure detection

Question asked by PeterT on Mar 16, 2015
Latest reply on Mar 30, 2015 by PeterT
We are using the internal RTC backed up by a goldcap.
In case of a power outage the backup voltage becomes lower by increasing time and at some time the oscillator stops running, but the RAM still remains valid for some time. So a magic number in RTC-RAM doesn't catch this. If the power returns while RTC-RAM is still valid everthing appears to look fine, but the RTC counter has stopped for an unknown time.

How can I detect the (potential) loss of time if RTC-voltage decreases?

Any idea is appreciated.