When not using USB power I have been considering where to apply a 3v non-chargable battery to the XIAO nRF52840 Sense.
- Applying 3v to Vbat appears to be ok but with a small voltage drop through Q1 Fet and U6 the LDO regulator.
- Appying 3v directly to 3V3 pin on header J1. It would appear that U6 LDO regulator Out pin can handle an applied voltage.
- I note that there is a label /CE on U2 TS pin. If TS is grounded it would appear to disable the charger IC. I can’t find if /CE is accessible or where else it is connected in the schematic.
Any thoughts and suggestions?