The computer USB charging causes the device to restart and there is no hardware reset register, the corresponding reset code is set

[copen]

At present, the nrf52840, sdk package is components_V15.2.0, it will restart probabilistically when the USB is connected to the computer for charging. The hardware reset register reads the corresponding reset code number is empty, and the hardware error interrupt will not be triggered. Make sure the device is not during charging. Will send data, hope the official can help analyze the problem

[awneil]

Is this on a Nordic DK, or custom hardware?

If custom hardware, please give details - schematics, etc

If custom hardware, can it be reproduced on a Nordic DK?

[copen]

yes,custom hardware,I can offer schematics

[copen]

[ketiljo]

Is the power supply on the VDDH pin stable when the device is connected to the USB for charging?

The cap on pin AC5 should be 4.7 µF

[copen]

We make sure that the voltage of this VDDH pin is stable, and it is stable after measuring with an oscilloscope. We test the USB charging and restarting, and sometimes removing the USB charging and restarting, but the record of the hardware reset register is empty. Removing D+ and D- will not restart