TRIM.LINCALCOEFF

[AndersG0]

Hello,
read through the documentation about the SAADC and found the TRIM.LINCALCOEFF[n] register.
ADC-linearity is important in the project I'm involved in... 
Seems that the register is available on all 54L devices

Can you share any information how to use it? 

Kind regards, Anders

[Håkon Alseth]

Hi,

 

This is a register that is written to when the driver is initialised.

There will be data copied from the FICR area, which is device specific data, and placed into the driver area, as shown here:

https://github.com/zephyrproject-rtos/hal_nordic/blob/nrfx-4.0.1/nrfx/drivers/src/nrfx_saadc.c#L382-L386

 

This register should not be written to by the application.

 

Kind regards,

Håkon

[AndersG0]

OK, Thanks.
So does that mean that every device ADC is calibrated during production testing?
(Also current engineering samples of nrf54LM20A?)

 Kind regards, Anders

[Håkon Alseth]

Hi,

 

Production grade silicon will be calibrated, while engineering silicon is not guaranteed to be.

SAADC electrical specs are not yet present for the nRF54LM20A device:

https://docs.nordicsemi.com/bundle/ps_nrf54LM20A/page/chapters/current_consumption/doc/current_consumption.html

 

They are however present for the nRF54L15/10/05 devices:

https://docs.nordicsemi.com/bundle/ps_nrf54L15/page/_tmp/nrf54l15/autodita/SAADC/parameters.elec_spec.html

 

Kind regards,

Håkon

[AndersG0]

OK,
I saw the elec-specs for the others.
What is the easiest way to find out if my samples are ADC calibrated or not?
(To initate the ADC and the look at the register content...?)

KInd regards, Anders

[Håkon Alseth]

Hi Anders,

 

There are no official specs for the nRF54LM20A device as of this time. The device in question is still in the engineering phase.

If you require roadmap related information, I would recommend that you contact your local regional sales manager.

 

If you do not have the contact details of your local RSM, please send me a direct message with your location, and I will provide you with this information.

 

Kind regards,

Håkon

[AndersG0]

Thanks, I have the contact details of my RSM, we can close the issue now.

Kind regards, Anders