Hi Bob B
Thank you very much for your reply. I found the schematic diagram you said. Without R23, the communication is normal. The reading and writing of ads122u04 register is completely correct. Now I test the program about tida-01526 downloaded from the official website. After the data is converted into the temperature, it is much different from the actual temperature. The room temperature of the pt1000rtd I connected is about 20 degrees Celsius, and after the data is converted, it is displayed as about 14 degrees Celsius. I hope you can help me analyze it again. My R13 is 3.9k ohm. My register configuration is as follows:
Thank you very much!