TMS570LS0714: ADC self-test issue

Part Number: TMS570LS0714

Hi, 

I try to use the function 'SL_SelfTest_ADC()' of the SafeTI Diagnostic Library to test a ADC input pin,

but sometimes I get the result 'ADC_PIN_UNDETERMINED' because the ADC conversion value 'Vu' it lower than 'Vn' value,

which mean the ADC sample the input channel with SELF_TEST=1 and HILO=1, the result is lower than SELF_TEST=0.

Here is the ADC value when it perform the self testing.

I find there is a similar question in the forum, but no answer about it.

Regards,

Snaku