Configuring a measurement involves setting the input channels and the type of measurement (single-ended or differential).

The FDC1004 can be configured with up to 4 separate measurements, where each measurement can be any valid configuration (that is, a specific channel can be used in multiple measurements). There is a dedicated configuration register for each of the 4 possible measurements (for example, MEAS_CONF1 in register 0x08 configures measurement 1, MEAS_CONF2 in register 0x09 configures measurement 2, ...). Configuring only one measurement is allowed, and it can be one of the 4 possible measurement configurations.

1. Setup the input channels for each measurement. Determine which of the 4 measurement configuration registers to use (registers 0x08 to 0x0A) and set the following:
   1. For single-ended measurement:
      1. Select the positive input pin for the measurement by setting the CHA field (bits[15:13]).
      2. Set CAPDAC (bits[9:5]) if the channel offset capacitance is more than 15pF.
   2. For a differential measurement:
      1. Select the positive input pin for the measurement by setting the CHA field (bits[15:13]).
      2. Select the negative input pin for the measurement by setting the CHB field (bits[12:10]). Note that the CAPDAC setting has no effect for a differential measurement.
2. Determine the appropriate sample rate. The sample rate sets the resolution of the measurement. Lower the sample rate higher is the resolution of the measurement.