The following procedure should be followed for determining the sensor characteristics:

1. Determine the diameter of coil (d_coil), which should be 3 times larger than the desired switching distance (d_switch)
2. Determine the desired frequency (ƒ_SENSOR) which should be between 300 kHz and 19 MHz
3. Calculate the range of allowable inductance from the following equation:
   Equation 7.

   where:

   • L_SENSOR is the inductance of the LSENSE coil or LREF coil
   • I_{SENSOR_MAX} is given in the electrical table
4. Calculate the externally placed sensor capacitor:

Equation 8.

where:

• C_BOARD is the parasitic capacitance introduced by the board layout (~4 pF for good layout)
• C_{IN_COM} is the parasitic pin capacitance of LCOM specified as 12 pF in the electrical table