ADS1220: How to use ADS1220 measure 2 2-wire RTD?

Part Number:ADS1220

Hi team,

I get one question from customer. They want to use ADS1220 to measure 2 2-wire RTD. They prefer resistor method, and they find our Tech note "Low-Cost, Single-Chip, Differential Temperature Measurement Solution Using Precision Delta-Sigma ADCs". However the problem is when one RTD is disconnected, the system stop work. So could a good solution to help customer achieve this function?

http://www.ti.com/lit/an/sbaa235a/sbaa235a.pdf