Hi Balazs, Thanks for your post and welcome to the forum! If you take a look at the pin functions table in the datasheet you will see that VREFCOM should be connected to AVSS when using a unipolar supply. I see that you have VREFCOM connected to a 100nF capacitor. Try replacing this cap with a 0ohm resistor and see if that helps! If you haven't seen it yet, the Basic Guide to RTD Measurements application report may be helpful: www.ti.com/.../sbaa275.pdf
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