Power reset question.

[hongpal]

Hello, Nordic!

I'm developing with nrf52840, s340, sdk 15.3.0 in my customboard

Anyway, recently, I have one problem about reset.

My device sometimes has rested and I got power reset reason is 0.

I found that it is because of por or bor.

My device is using high mode and vdd is 1.8 V

I don't know how to solve this problem.

[Simonr]

Are you able to power all these peripherals with an output of 1.8V?

The Brown-out resets occur when your input voltage drop below ~3.6V. In order to run the nRF52840 while outputting 1.8V from REGOUT0 you need to be able to power the nRF52840 (1.8V) as well as the output regulator (1.8V). So if possible, you should try to stabilize your voltage source to be more consistent.

Best regards,

Simon

[hongpal]

Yes I am able to power all these peripherals with an output of 1.8V.

Does the Brown-out resets occur when input voltage drop below ~ 1.7V in high voltage mode ?

My battery voltage's range is 3.0 ~ 4.2. Then do I need to cut voltage at 3.6V?