RESETREAS Brown-out reset nrf52832

[jcorn_ps]

Note: related to  Possible Damage from camera flash nRF52832-CIAA-R (WLCSP) 

Last week we had an issue regarding camera flash triggering reset and undefined behavior in our nRF52832. We have been able to reproduce this issue in a control environment and have confirmed that the nRF52832 is the issue. 

We put a multimeter on VDD (working on sourcing an oscilloscope for this) to see if we were having voltage fluctuations and we observed a drop of ~600mV immediately following the camera flash.

As we suspect the reason for the reset behavior is brown-out reset (datasheet sec. 18.6.6) we would like to be able to confirm this and include in crash logs. Is it possible to retrieve this reset reason from the RESETREAS register? We cannot find a brown-out value for that register (section 18.9.3)

JC

[MJJ]

There is not a dedicated bit as you described. "If none of the reset sources are flagged, this indicates that the chip was reset from the on-chip reset generator, which will indicate a power-on-reset or a brownout reset."