Vbat Wiring

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waynewen2003
Posts: 2
Joined: Wed Jul 24, 2019 9:01 am

Wed Jul 24, 2019 9:02 am

How do we wire Vbat? are there any resistors or caps needed??
jrowe88
Posts: 16
Joined: Wed Jun 26, 2019 3:30 am

Thu Sep 05, 2019 5:26 am

The STM docs have pretty good reference diagrams, but show it only with a battery where you wouldn't use a cap. As far as I can tell there isn't a practical use for actually connecting this to a battery on a FC (persistent clock or backup registers) and most seem to treat it like a VDD pin and wire it to your 3.3V net. Older chips indicate a 100nF capacitor should be added if tying to VDD. (Some comments on the subject here: https://community.st.com/s/question/0D5 ... nconnected)
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