nRF51822 POFCON setting at VDD 2.1V

RE: nRF51822 POFCON setting at VDD 2.1V

gshah — Fri, 21 Jul 2017 19:19:44 GMT

POFWARN event for Power failure warning will be triggered on any voltage below 2.1V is detected after POFCON enabled. You can also disable softdevice and check for this warning once POFCON is enable and threshold is set. if (NRF_POWER->EVENTS_POFWARN) condition can be helpful to check for this event. Clearing this event / interrupt might help to see this triggered again from voltage going lower then threshold in next power cycle if any.

RE: nRF51822 POFCON setting at VDD 2.1V

testy — Wed, 18 Mar 2015 05:36:55 GMT

Tested with:

uint32_t p_event;
err_code = sd_evt_get(&p_event);	// get any pending events generated by the SoC API

if (err_code == NRF_SUCCESS)
{
	if (p_event == NRF_EVT_POWER_FAILURE_WARNING)	// SD event
	{
		sd_nvic_ClearPendingIRQ(SD_EVT_IRQn);	// clear NRF_POWER->EVENTS_POFWARN after MOTOR test (to clear preceding warnings)
	}
}

Works as expected.

RE: nRF51822 POFCON setting at VDD 2.1V

Stefan Birnir Sverrisson — Tue, 17 Mar 2015 14:18:12 GMT

If you enable the POF when equal or under the configured warning voltage, it should give you a warning when you enable it. Once the POF has given a warning event, the supply voltage will need to exceed V_POF+V_HYST in order to give warning again, see nRF51 Series Reference Manual 3.0, section 12.1.9