Motorola M68EZ328ADS user manual Determination of X,Y Position

Freescale Semiconductor, Inc.

ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005

Freescale Semiconductor, Inc.

Resistive Touch Panel Operation

The resistive panel works by applying a voltage gradient across one conductive layer and measuring the voltage at the point of contact with the opposing conductive layer. For

instance, as shown in Figure 2-2,the resistive film acts as a series of resistors.

ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005

Figure 2-2. Determination of X,Y Position

When a point is contacted, it means the two opposing conductive layers come into electrical contact. The x position of actuation can be determined by measuring the output voltage of the y layer. At the same time, the y position can be find out by measuring the x layer. The exact position can be determined by referencing the output voltage to the distance relation- ship.

B-31M68EZ328ADS v2.0 USER’S MANUALMOTOROLA

For More Information On This Product,

Go to: www.freescale.com