https://devzone.nordicsemi.com/f/nordic-q-a/44738/saadc-differential-mode-voltageHi, I would like to measure the voltage generated by a Thermoelectric generator. The voltage vary between -250mV and 250mV depending on the temperature gradient. If the generator is floating (not referenced to the circuit ground) and that I connecten-USTelligent Community 13Wed, 11 Dec 2019 07:07:48 GMThttps://devzone.nordicsemi.com/thread/224845?ContentTypeID=1Wed, 11 Dec 2019 07:07:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4e1a945a-a275-4e62-9aa8-331c7a0c1381VTIot <p>Hi! Did you ever find the answer to this? I am looking to do something very similar with a thermoelectric generator (voltage range of +\- 0.5V) and I don&rsquo;t know if it will work when the differential voltage is negative.&nbsp;</p> <p>Your help is appreciated!!&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/176028?ContentTypeID=1Wed, 13 Mar 2019 17:38:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7a559fbc-7c51-4aca-ab2f-088ce9b37b2bCarsten Wulff<p>That depends, you have to ensure that the voltage on either pin (+ or - ) does not exceed the absolute maximum rating of the device, you can find that in the product description.&nbsp;</p> <p>Other than that I would be concerned with the amount of current that your thermo generator could produce, particularly if the load impedance varies significantly.</p> <p>As long as the absolute max ratings are ok, then I would expect the SAADC to work in differential mode.&nbsp;</p> <p>I would consider if adding a cap from + and - to ground provides some ac short to ground, so the common mode does not vary to much at high frequencies.</p><div style="clear:both;"></div>