SPRZ572A April 2024 – September 2024 TMS320F28P550SJ , TMS320F28P559SJ-Q1
ADC: Enable Power to All ADCs to Avoid Incorrect VREFHI/VREFLO Behavior
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If all ADCs are not enabled there will be a weak pulldown to VSSA present on both the VREFHI and VREFLO signal paths, this impacts all reference selections. The pulldown will cause a voltage droop on the respective reference, which will cause an error the ADC conversion.
Enable all ADCs via their ADCPWDNZ bit(set to 1) in ADCTL1 register even if the ADC is not used by the system.