Hi,Can @Zepan please provide board view files for the lp0? I really want to know where jumper j12 is.
Here is the boardview
Ah ok. One question though. Where would I connect a small button cell battery in order to keep the RTC going?
J12 is power for RTC。Vrtc is default connect to 3.3V(so it mark as 3V3, in fact it is Vrtc).If you want power Vrtc individual, you should remove the 0R resistance on the left of the tf slot, and connect RTC battery to j12.