KlausST
Advanced Member level 7
Hi,
* If there is a single "input reference" for differential mode, it would be just as well
* if there is the possibility for simultaneous sampling of two channels, it would be almost as good. Just subtract both conversion results as software.
* if neither of the above, then you might do an extra conversion of V_com and subtract it from the other conversion results, but the measurement is not that precise, because of different time sampling. But it still makes sense. At least wire the V_Com to the ADC (non muxed to an extra ADC input) then you are free to use it or not.
But there should be a VRef pin. Use a simple voltage divider to get VRef/2.
Klaus
* If it has a dedicated negative input, it would be best.Therefore Does it make sense to identify the negatives analogue ADC IOs to connect them to 0V_Sensor?
* If there is a single "input reference" for differential mode, it would be just as well
* if there is the possibility for simultaneous sampling of two channels, it would be almost as good. Just subtract both conversion results as software.
* if neither of the above, then you might do an extra conversion of V_com and subtract it from the other conversion results, but the measurement is not that precise, because of different time sampling. But it still makes sense. At least wire the V_Com to the ADC (non muxed to an extra ADC input) then you are free to use it or not.
I did not expect that there is a VRef/2 pin.Furthermore the uC does not have an output pin vref/2
But there should be a VRef pin. Use a simple voltage divider to get VRef/2.
Klaus