This might be a very common question but I am unable to find an answer to it. We are looking for some get methods to verify the correctness of ADC readings. Our application is digital power control and therefore good ADC readings are very important for control and safety perspective. For e.g. reading a current or voltage value much lower than actual can not only result in controls failure but also damage the power electronics. We have implemented hardware tripping on some more risky measurements but there are is also software based tripping on some measurements such as temperature rise. It will be very nice if someone can guide us if there are some standard checks that we can perform on ADC readings on power up of the DSP?.
The only test for faulty ADC inputs that come to my mind is to check if an ADC input is permanently shorted with either Vss or Vdd. For Vdd case it is easy to check (as ADC reads max value) but for Vss there can be uncertainty as some of our readings actually have zero readings at Vss.
Should there be some external circuitry that can force some reference voltages on analog inputs during test phase for reading and validating purpose?.
Are there some other peripherals that must be checked and verified on power up for digital power control applications?.
