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Forum Post: RE: ADS1220: Only returning 0xFFFFFFFFFF after sending RDATA command

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Hello Angel, It looks like it is getting the longer the stranger: I'm doing 3 consecutive measurements in continuous mode starting with the command 08h ( START/SYNC) and then reading three times but not before the DRDY pin goes low. The results are respectively 7B7B7Bh, FF617Bh and FF617Bh. Heating the PT100 doesn't change the returned data although I see the voltage raising from 0,11 V to 0,14 V and the voltage over the Rref is dropping from 0,9 V to 0,5 V. For me it is obvious I'm doing something wrong, but what??? Greetings, Hans

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