SPRZ572A April 2024 – September 2024 TMS320F28P550SJ , TMS320F28P559SJ-Q1
ADC: There is a Resistive Path Between the Shared Analog Inputs Present on the VREFHI/VREFLO Pins
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When the ADC reference is set to VDDA/VSSA, the VREFHI and VREFLO pins may be used as additional input channels to the ADCs on the device. The VREFHI pin is shared with ADC inputs D20 and E20 channels; and the VREFLO pin is shared with ADC inputs A13, B13, C13, D1, and E13. In this reference mode, there is a resistive connection between these two pins.
There is no issue if the VREFHI and VREFLO pins are used for the analog reference. If the pins are used as analog inputs it is recommended to only drive one of the two, and float the other.