Default value of POFCON in nRF52832

[Vala]

Hi,

I want to make sure that the nRF52832 can start working (turn on) with a 1.8V power supply. Therefore I went to check the default value of POFCON register, in which the Brownout voltage can be set. As the datasheet says, the default value is 0x00000000, although the THRESHOLD field can accept values from 4 to 15. Could anyone tell me what will the Brownout voltage would be after restart?

Thanks in advance.

[Vala]

I guess I found the answer to my question here and here. So as I understood, whatever the value of POFCON is, the device starts working if the source voltage is in the range of 1.7 ot 3.6V and when it is lower that set thresholds (including the one for Brownout voltage), it just produces an event and does not turn off the device. Am I right?

[Petter Myhre]

The BOR voltage threshold is fixed. See this.

The power-fail comparator (POF) can provide the CPU with an early warning of impending power failure. It will not reset the system, but give the CPU time to prepare for an orderly power-down.

The comparator features a hysteresis of VHYST, as illustrated in Figure 4. The threshold VPOF is set in register POFCON. If the POF is enabled and the supply voltage falls below VPOF, the POFWARN event will be generated.