S32K中的主题 Re: S32K ADC Accuracy

S32K ADC Accuracy

Udhay — Mon, 12 May 2025 17:42:12 GMT

Hello NXP Community,

Seeing voltage measurement accuracy issues on S32K Micro. We have connected 5V Regulated Power Supply to S32K Supply and VREF pins. Unfortunately, 5V Regulator which we have used has 2% tolerance and it may be effecting ADC Measurement accuracy. Any suggestions for compensation of ADC value for better accuracy? Is there any registers within S32K Micro to read VREF value?

Re: S32K ADC Accuracy

danielmartynek — Tue, 13 May 2025 13:21:09 GMT

Hi @Udhay,

To monitor VREF changes use the internal bandgap ADC channel. The channel
delivers a fixed 1.2 V voltage independently from the reference voltage and the power supply.

The bandgap reference measurement is also a part of the ADC selftest.

Refer to the RM, Section 60.3.17.2.4 Self-test analog watchdog for more information about the self-test.

Regards,

Daniel

Re: S32K ADC Accuracy

Udhay — Mon, 19 May 2025 15:44:24 GMT

Hello Daniel,

Thank you very much for your advise on the ADC Accuracy issue. As you suggested, we will try monitoring the VREF changes using internal bandgap ADC channel. I will let you know incase if there is any issue on implementation of this.

Have a great day!

Thanks & Best Regards!

N. Udhaya Bhaskara Rao