STM32L051 battery backup

joel239955 · ‎2014-12-16

Posted on December 16, 2014 at 15:58

hi everybody,

as far as i understood the data in the RTC registers are lost after a hardware reset or the power is lost. So the next idea is to use a battery as a backup. But after reading the data sheet and reference manual i can't find a pin on the STM32L051 to connect to a battery. Can someone confirm this? Are there any other possibilities to keep the RTC data?

#stm32l0 #rtc #battery-backup

Tesla DeLorean · ‎2014-12-16

Posted on December 16, 2014 at 17:03

Can't say I've spent any time on the L0, but the L1 was similar, it was expected to be battery powered. You could use a

https://www.fairchildsemi.com/datasheets/BA/BAV70.pdf

on the supply to use the primary or battery supply.

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