Im working on ad7142 for proximity detection. Can any one please provide the equation to map the output CDC code to corresponding capacitance value?

  • 0
    •  Analog Employees 
    on May 27, 2019 4:27 PM over 1 year ago

    Input range is +/-2pF, converter resolution is 16-bits, therefore capacitance measured = CDC_Code*4pF/65536. This equation holds true for relative capacitance changes after the bulk capacitance has been removed using the STAGEx_AFE_OFFSET register. To measure absolute capacitance both the CDC code and the STAGEx_AFE_OFFSET register value must be taken into account.