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[MPC5748G] ADC calibration sometimes fails

Question asked by Travis Kuo on Sep 20, 2018

Hi,

 

I am using S32DS SDK to test ADC on MPC5748G DEVKIT. My ADC input pins (channels) are PB4, PD4 and PD5.

My test result shows sometimes ADC calibration failed at ADC_Init(). 

Register ADCx_CALBISTREG reports failure at bit 28.

Failures can still happen even inputs are connected to 3.3V or GND.

May I know which cases will make ADC calibration fail?

 

Thanks

Travis

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