CALIBRATE OFFSET of nRF52832

[OKA_T.T]

 

How much is the temperature characteristic improved by setting CALIBRATE OFFSET for nRF52832?
How much does CALIBRATE OFFSET improve the temperature characteristics?

Are there any points to note when using it in the following temperature range (-40 to 80°C)?

[ovrebekk]

Hi 

I need to forward your question to our hardware designers when they are back over the new year, and get back to you then. 

I apologise for the delay. 

Best regards
Torbjørn

[OKA_T.T]

Thank you for contacting us.

We look forward to your response.

Thank you.

[ovrebekk]

Hi again

Calibrating the offset error will significantly improve the accuracy at extreme temperatures, but we don't have any data showing the exact difference. 

One thing that is important to note about calibration is that if you calibrate too often you can see less reliable readings. The calibration is done using an ADC resolution of 10-bits, and if the measured value is at the boundary between 2 distinct values you might see the ADC calibration change even if the temperature is the same. 
The result of this is less consistent readings than if you did not perform calibration. 

If you have some way to detect temperature change (using the temp sensor in the nRF device for instance) you can use this to trigger calibration, to avoid performing calibration too often. 

Best regards
Torbjørn

[OKA_T.T]

Thank you for your quick response.

I understand the content.
I will try to use the advice you gave me.

[ovrebekk]

Hi 

I am happy to help. 

If you have more questions just let me know. Otherwise, the best of luck with your project

Best regards
Torbjørn