STM32F4 Discovery Vbat pin

[emsing007]

Posted on October 15, 2014 at 14:48

Hello.

Where is a Vbat pin on a STM32F4 Discovery? How to connect external 3v3 battery on board? I use rtc.Best regards

[waclawek.jan]

Posted on October 15, 2014 at 15:01

VBAT on F4-Discovery is not brought out to the headers. The only way is to remove R26 and somehow wire up the battery to its pad connected to VBAT.

You are not the first to ask: https://my.st.com/public/STe2ecommunities/mcu/Lists/STM32Discovery/Flat.aspx?RootFolder=%2Fpublic%2FSTe2ecommunities%2Fmcu%2FLists%2FSTM32Discovery%2FSTM32F4DISCOVERY%20VBAT%20pin&FolderCTID=0x01200200770978C69A1141439FE559EB459D75800084C20D8867EAD444A5987D47BE638E0F&currentviews=251 JW