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AD7195 internal calibration

Question asked by dirk.bruere on Jun 19, 2015
Latest reply on Jun 23, 2015 by rcalam

I am using this chip with a PT100, taking the reference from a 5K precision resistor to obtain sub-milliKelvin resolution.

As part of the startup routine I get it to do an internal calibration, with results in the Offset and Fullscale registers.

The problem is that each reset loads sufficiently different values that accuracy of the temperature measurements degrades by up to 20mK, which is unacceptable.

So, what is the recommended procedure for handling this situation?