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Frequency selection for capacitance measurement

sourabh tokikar
Prodigy 140 points
Other Parts Discussed in Thread: FDC2214

How frequency is selected for capacitance measurement.

  • 0
    TI__Mastermind 23810 points
    The frequency for the FDCxxx devices is selected by the capacitance of the sensor and the inductor added to the PCB. Equation 7 of the FDC2214 datasheet shows how this relationship works for a differential measurement.

    You can also think of it as: f_sensor = 1/(2*PI*sqrt(L*C))