TMS320F2800137: The output of sampling C7 is not correct

Hi,

When i do open loop test and find that the ADC C7 sampling result is not correct,I measured the analog voltage before C7 is 0.03V, which indicates 0.3A current, also 37 digital value in ADCReading.

OPTIMIZER_adcCResult0 = ADC_readResult(ADCCRESULT_BASE, ADC_SOC_NUMBER0);
OPTIMIZER_Output_I_int = OPTIMIZER_adcCResult0;

But the reading of ADC is not correct, OPTIMIZER_Output_I_int shows 7 digital value, which should be 37.

I also tested with ADC input clamped to 0V and 3.3V, readings are all correct.

Other readings for other channels are all correct.

I tried to replace with a new Control card, also increase the sampling time, or change to ADCA, but none of them works..

Do you know what could be the possible reason?

Thanks!

Bowen

Lydia：

Hello, I noticed that Stevan Duraskovic has replied to the post on the English forum. If you have any further questions, please continue to contact Stevan Duraskovic on the English forum

,

Bowen Ling：

Hi Lydia,

Yes, thanks for your help.

BR,

Bowen