ADC Reading

[EmbeddedEnjoyer]

I am trying to configure ADC on the NXP S32K144EVB and I am using the ADC example and editing that. I am successfully getting a reading from a sensor I am using but I find that when I switch from using the USB as the power source to the barrel jack as the power source, I get a difference in reading. Why is this happening and what can I do about it?

[Robin_Shen]

Hi

Please check the difference in VREFH voltage when using J7 and J16 power supply.

VREFH VDD_MCU VDD J10 S32K144EVB-Q100.png

If there is no difference in the VREFH voltage, then check the voltage difference at the sensor connection to the ADC pin.

Best Regards,
Robin
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[Robin_Shen]

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