A 20-bit ADC ensures that you have a 0.1C flicker free resolution for RTD. A thermistor on the other hand requires <16-bit ADC for 0.1C resolution. But you can very well use a 20-bit ADC and +/-1.024V for the thermistor too if you want to use the same ADC configuration for both RTD and thermistor
Thank you so much for your quick response.
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The ADC in PSoC3 and PSoC5 has the ability to specirfy up to 4 different configurations from which you may select or switch to at run-time with an API. So depending on the requirements of your application you may program an universal solution or select a specialized one.
Thanks Bob. .