nRF51422 startup time for 32kHz

[takin]

Hello I have a question for startup time for 32kHz of nRF51422. nRF51422_PS v3.1 indicates startup time for 32kHz typ 0.3sec.

What is this spec minimum value. I’d like to know approximately value of this spec.

[takin]

Hi Håkon

Thank you for your answer. If I use the crystal that startup time is 80msec, is that OK for nRF51422 ?

And would you tell me what "tstart,x32k" is meant. I think that it means if startup time of the crystal what I choose below the value, it works with no problem.

regards

[Håkon Alseth]

You'll have to wait until the xosc32k is stable, which is the parameter tstart,x32k. This will be in the range of up to 1 second, depending on what type of extern 32k xtal you choose.