ADC Calibration on MPC5674F

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ADC Calibration on MPC5674F

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tgc-yilmaz
Contributor III

Hello,

I'm using a MPC5674F. I want to read adc values with eQADC and want to work in Continuous Scan mode. I would also like to calibrate the adc module. But for the calibration of adc, I have to refer to 3 different voltage values (except 5V). I have no idea how to get the calibration values (gain, offset) with 3 reference points. Can you help with this?

Thank you for your help...

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davidtosenovjan
NXP TechSupport
NXP TechSupport

Hi, calibration routine is described in the AN2989:

https://www.nxp.com/docs/en/application-note/AN2989.pdf

 

Note, that reference channels must be sampled in the moment ADC voltages are stabilized what defined as 8ms (Delay from power up to full accuracy = 8 ms.)

Example code with eQADC calibration you may find here:

https://community.nxp.com/docs/DOC-334425

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