I was working on a project and it required me to record temperature values. Initially, I used 4 RTD's with the step up as follows and it was working fine. The excitation current used was 50uA

Now, I need to use 6 RTD's but I can only fit 5 RTD's with this setup. Is there a way to accommodate 6 RTD's by sharing the resistors? Any help is greatly appreciated

Parents Reply
  • 0
    •  Analog Employees 
    on Mar 31, 2021 2:47 AM in reply to Kartik

    Hi Kartik, 

        Yes, the same Rsense sharing approach works with 3W RTD. Note that the sense resistor will see 2x the selected excitation current (see pp 34-35 in the datasheet). 

        Note that the evaluation software is great for checking configurations. Here are 3 3W RTDs sharing a single sense resistor. This can be extended to 9 3W RTDs if a single sense resistor is used.