About 85-105deg LFXODEBOUNCE register setting of nRF52820

RE: About 85-105deg LFXODEBOUNCE register setting of nRF52820

Masa — Fri, 16 Dec 2022 01:25:56 GMT

Hi,

thank you for your reply.

Check with this setting.

Best Regards

Masa

RE: About 85-105deg LFXODEBOUNCE register setting of nRF52820

Jared — Thu, 15 Dec 2022 13:56:52 GMT

Hi,

[quote user="MSL"]Is it enough to say 'NRF_CLOCK->LFXODEBOUNCE = 1;' at the beginning of the "main.c" program?[/quote]

Yes, that should be enough. Just make sure that you do it before you initialize the Softdevice.

regards

Jared

RE: About 85-105deg LFXODEBOUNCE register setting of nRF52820

Masa — Wed, 14 Dec 2022 07:53:58 GMT

Hi,

Thank you for your answer.

I understand that if there is a possibility of using the MCU above 85deg, this 'LFXODEBOUNCE' should be set to 'Extended', even if the starting temperature is 25deg.

Is there a sample of how to set up this 'LFXODEBOUNCE'?
Is it enough to say 'NRF_CLOCK->LFXODEBOUNCE = 1;' at the beginning of the "main.c" program?

Best Regards

Masa

RE: About 85-105deg LFXODEBOUNCE register setting of nRF52820

Jared — Tue, 13 Dec 2022 12:25:25 GMT

Hi,

I assume that you're using our Softdevice.

The LFXODEBOUNCE register should be set once before initializing the Softdevice. The consequence of setting the register to Extended is that the Softdevice will increase the time it waits for the LFXO crystal to start up, since the crystal will take longer time to be stable when the temperature is higher. This means that the only consequence of setting the register to Extended while the temperature is under 85 degrees is that the Softdevice will take longer time to initialize.

In addition, the Softdevice API does not have a function that writes to the LFXODEBOUNCE register, and the Clock peripheral is restricted when the Softedvice is initialized. This means that if you want to set the LFXODEBOUNCE register after the Softdevice has been initialized, you would have to un initialize the Softdevice first. Thus, I would recommend setting the LFXODEBOUNCE once, before you initialize the Softdevice if you expect the temperature to increase over 85 C.

regards

Jared