I’m using some supercap to power the VBAT input of the Colibri imx6ull module. I’m using a schottky diode to charge the supercap from the +3.3V power supply. The supercap is then connected to the VBAT (pin 40) of the Colibri module.
The problem is that if I switch of the power supply, the +3.3V power rail is somehow still powered from the backup battery.
- Is there any hardware problem on the Colibri module?
- Or is it because of powering the SNVS rail and passively supplying the +3.3V rail from some SNVS IO pins I’m using?