Connect a backup battery at the Nucleo-L432KC board

[Tommaso De Gennaro]

Posted on March 18, 2018 at 13:11

Hello,

I'm working on a project based on the Nucleo-L432KC board that uses the RTC.

I would like to insert a backup battery for the RTC, but I noted that there isn't a VBAT pin where to connect it.

Therefore, cannot a battery backup be used for this board or are there any configurations to be made on it?

Waiting for your feedback

Best RegardsTommaso#rtc #nucleo-l432kc #backup-battery

[Bogdan Golab]

Posted on March 18, 2018 at 13:45

Not sure if this pin exists as: '

VBAT pin

is not available on low pin-count packages'

http://www.st.com/content/ccc/resource/technical/document/reference_manual/group0/b0/ac/3e/8f/6d/21/47/af/DM00151940/files/DM00151940.pdf/jcr:content/translations/en.DM00151940.pdf

 

[Uwe Bonnes]

Posted on March 18, 2018 at 13:45

Look at AN4718 : 'How to design a VBAT system based on

STM32L0/L1 series (with external components)'. The reccomendation should aplly for the L4 too, and the application not should also be extended for the L43 and should also be visible in the L43 product page resources section.