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
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
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
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
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.