57.6.15.4 4-wire Pressure Measurement Method

The method to measure the pressure (Rp) applied to the touchscreen is based on the known resistance of the X-Panel resistance (Rxp).

Three conversions (Xpos,Z1,Z2) are necessary to determine the value of Rp (Zaxis resistance).

Rp = Rxp × (Xpos/1024) × [(Z2/Z1)-1]

Figure 57-16. Pressure Measurement