nRF52832 Power on Reset and nRESET

[ogura]

in my circuit, it takes 17ms for VCC_NRF to go up from 0 to 1.7V and reach 3.0V, but nRESET PIN does NOT to go up to VCC_NRF. what is the potential cause of this problem?

here is the waveform for VCC_NRF and nRESET

[Sigurd]

Hi,

Does the nRESET signal never go high?

Are you measuring on pin 21 ?

Is anything connected to pin 21?

What SDK version are you using? What example in the SDK are you testing this with?

[Jared]

ogura did you ever determine the cause of this? Have a similar power up issue on a board with an LDO that takes almost 1ms to get to minimum 1.76V

[Jared]

Turned out to be a DC/DC loading issue. 2.2uF was stuffed instead of a 100nF for the DEC caps. Seems like some unknown inductors were also stuffed.