I have a question regarding PT100 measurement. From your own experience (if you have such), would you use, or have you used a built in 12bit ADC converter (like in new XMEGA)for PT100 measurement? What was your experience with it? What limits did the system have?
I have used once the 10bit ADC of the AT90CAN128 for PT100 measurement, but it was only +/-4Â°C accurate. So from this experience I'm a bit afraid if a 12bit ADC would be enough for +/-1Â°C or better accuracy.
If you have experience on this field, please feel free to share.