Hi Leon, For a 3-wire RTD measurement you would typically use all of the analog inputs in a single ADS1220 device, so only one RTD can be measured per ADC (you can read more about RTD configurations in the following app note: A Basic Guide to RTD Measurements (Rev. A) ). The recommendation would be to use a separate ADC for every 3-wire PT-100 RTD. Another potential solution would be to use a higher input channel count device or use an external MUX Infront of the ADC to interface different RTDs, but still only one RTD would be measured at a time with this approach. Best Regards, Angel
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