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ADS124S08EVM: Connect two 3wire RTD to ADS124s08EVM board.

Mehul Dabholkar
Intellectual 625 points

Part Number: ADS124S08EVM
Other Parts Discussed in Thread: ADS124S08

Hi guys,

I am using ADS124s08EVM REV B. i want to connect 2x 3-wire RTD and read temp data using delta sigma GUI. Is there information available for  connection and also script . how i can connect twr RTD at same tome to EVM ? . 

  • 0
    TI__Guru 59361 points

    Hi Mehul Dabholkar,

    You can review our RTD design guide for this information: https://www.ti.com/lit/an/sbaa275a/sbaa275a.pdf?ts=1773414345120&ref_url=https%253A%252F%252Fwww.google.com%252F

    Specifically section 2.10 talks about connecting multiple 3-wire RTDs. The ADC used in the document is a "generic" delta sigma ADC, but the ADS124S08 is certainly capable of supporting this

    Regarding the GUI: the GUI can only display one channel's data at a time, so there is no way to measure both RTDs using the GUI directly. You would have to measure one channel, change the appropriate settings manually, then measure the next channel

    You can try the scripting functionality, there is no preset script for what you want to do. There should be a script for a single 3-wire RTD measurement, which you can modify of course to add the appropriate WREG for your system followed by another data read. Again, note that you will manually have to collect this data however, the GUI cannot display it. When you have the data you can convert it manually

    -Bryan