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Someone knows if it's possible to set the internal ground as input in the ATXMega256A3BU? I need it to find the zero offset.

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To my knowledge, it is not possible.


I have used the 16/32A4, 64B3, 128A3 and 16D4. None of them have this capability. I always dedicate a separate ADC NEG pin for GND and measure differentially against it. But it also lets you measure the ground offset.

In case you don't have any spara pins and/or you already manufactured the board, there's probably no easy way for you...

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  • \$\begingroup\$ May be selecting the DAC input and give it the 0 value? Or it also may be affected by an offset error? \$\endgroup\$
    – Maicol
    Commented Feb 10, 2014 at 15:23
  • \$\begingroup\$ I haven't used the DAC yet, so I cannot tell if, or to what extent, the offset error is significant in such case. \$\endgroup\$
    – Dzarda
    Commented Feb 10, 2014 at 15:26

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