Minimum pulse length to detect low level with GPIO SENSE for nRF52

[Remo]

Hi all

What is the minimum required length of a LOW pulse to be detected by the nRF52832 via GPIO SENSE mechanism? I couldn't find it in the product specification.

I want to wakeup the nRF with a LOW pulse on a GPIO from the System OFF mode.

Kind regards

[bjorn-spockeli]

Hi Remo,

the minimum pulse width needed trigger DETECT Signal(which in turn will trigger the SENSE signal) is around 10uS.

Best regards

Bjørn

[Remo]

Thanks for your answer. Why is this time much longer for the nRF52832 than for the nRF51822? According to this thread, the nRF51822 only needed 200ns.

[bjorn-spockeli]

10uS is the number I got from R&D. However, it might be that this is rather conservative. I will look into it and update my answer if it can be adjusted down.

[Remo]

Hi. Do you have any news? Thanks in advance.

[bjorn-spockeli]

I apologize for my late reply. Yes, 8uS should also be fine, but the 10uS is still recommend as it was chosen in order to avoid marginal design where external factors reduce the actual pulse width seen by the device.