Used in combination with NPM1100 and NRF52832

[zhu xueqi]

NPM1100 outputs VOUTB (2.1V) to power the NRF52832. Programming is performed via J-Link with an external 3.3V power supply. However, this causes a short circuit between VSYS and GND of the NPM1100. How to solve this problem?

[ketiljo]

The nPM1100 can't be backpowered so don't do that! When you power the nRF from the nPM1100, you _can_not_ use higher external voltage.

[zhu xueqi]

Thanks for your reply. The problem has been basically confirmed: the chip was damaged by reverse power supply of 3.3V to the NPM1100 (short circuit between VSYS and GND). It is now powered by a battery and programmed via J-LINK.