NRF52 default TX\RX rampup time

[Hagay H.]

Hi, I see that the nominal deafult rampup time is 140 us in NRF52. However, I'm measuring it with logic (via GPIO+PPI) and I get 129.4 us. Why there is such a difference?

Thanks.

[Joakim Jakobsen]

Hi hagay h. Are you using ESB? If you are, I would recommend that you take a look at this question and specifically the answer from Torbjørn.

[Hagay H.]

No, I'm not using ESB.

[Joakim Jakobsen]

Hi Hagay!

I've been looking into your problem, but I'm afraid I don't have a specific answer to solve your question.
You can take a look at Torbjørn's answer in this post:

We haven't characterized the max/min values for these timings unfortunately, so we don't really know.

That's the best answer I can give you at the time. The 140us value in the specification is just the typical value, but I will update my answer if we get any updates on the min/max values.

Best regards,
Joakim.