Interlink-electronics VersaPad USB Manuel d'utilisateur télécharger pdf (Page 4)

USB

ersaPad®

Integration Guide

www.interlinkelectronics.com

3.0 Theory of Operation

The touchpad sensor is a four-wire resistive type. The pad is composed of two resistive layers

separated by an air gap. One plate is used for the X-axis and the other is used for the Y-axis.

When pressure is applied, the two resistive plates make contact. A microcontroller measures

position and pressure then uses advanced, proprietary algorithms to yield smooth mouse

functionality. Figure 1 shows the electrical representation of the sensor and Figure 2 shows a

simplified exploded view of the sensor.

Figure 1: VersaPad Equivalent Electrical Circuit

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Interlink-electronics VersaPad USB Manuel d'utilisateur Page 4