Powering up after a sd_power_system_off().

RE: Powering up after a sd_power_system_off().

Priyanka — Wed, 10 Jul 2024 09:21:32 GMT

Glad to hear that it worked. 🙂

RE: Powering up after a sd_power_system_off().

Sietse — Tue, 09 Jul 2024 13:26:14 GMT

Sorry for the late reply.

I just resolved the issue. The problem was your issue #2. I didn't realize that when the power was turned off together with the low power consumption it would take 20 seconds for the 100 uF capacitor after the switch to empty.

Thanks for the help!

Sietse

RE: Powering up after a sd_power_system_off().

Priyanka — Thu, 04 Jul 2024 11:58:42 GMT

Hi,

This can occur due to several reasons. Please check the following:

1. Please make sure that the brownout detector of the nRF52840 is configured correctly in your application. If it doesn't detect the power-off state properly, this can occur.

2. Also, ensure that there is enough time between powering on and off the circuit.

3. You can try to use a GPIO pin to manually control the reset pin of the nRF52840. This can be done by connecting a GPIO pin to the RESETN pin and toggling it low in your application, before system off.

4. You can also try to use an external reset circuit, say, a simple RC circuit, so that when power is applied, the proper reset signal is sent to RESETN pin.

Please try these and let me know how it goes.

Regards,

Priyanka