VCC drop to ensure reboot

[ahrnicek]

Hello, 

I'm working on a product where we want the nRF52840 to be able to reset itself in hardware . This is currently done via an IO that drives a SHUTDOWN# signal into our power path which kills power momentarily to the 3.3V regulator that powers our nRF device. Due to the capacitance on the 3.3V rail it is dropping to about 1.0V for 15-20ms. Is this sufficiently low to ensure a hardware reset of the device? I couldn't find anything other than the 1.7V minimum recommended inputs to suggest otherwise but want to be sure this feature will work for us reliably. 

Thank you,

Andy

[SwRa]

Hello,

Yes, 1 V is sufficiently low to ensure reset. But make sure that the voltage drops below 1.2V at both high and low temperature since capacitor tends to change behavior depending on the temperature.

Regards,

Swathy