RTC clock resets to 1969 even with VBAT connected

Hi ,

I'm using ArmStoneA9r2 Dual board with the Linux Buildroot fsimx6B2020.04. For the managing the system clock, I've connected a CR2032 3.3V battery for RTC at the power connector.
I'm using the command hwclock -w to set the time to RTC.

After disconnecting the power abruptly, the system clock is getting rest to 1969 occasionally. This reset of time is causing a problem for the application we run which depends hugely on local time.

Please help me with this issue.

Hi

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What exactly do you mean by "occasionally"?

Could you describe a exact way to reproduce this issue?

Power interruption to the device completely turns off the device. Even though power interruption is a regular thing, date and time is retained.
Recently we had a building wide power interruption after which date and time got reset to 1969. Checked the voltage on the VBAT pins, it was still showing the 3v3 of battery.

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Does it also occur when use a 3v3 power adapter instead of a battery?

I haven't tried connecting the power adaptor.