Motorola M68EZ328ADS - Manual (Page 32)

Resistive Touch Panel Operation
B-31 M68EZ328ADS v2.0 USER’S MANUAL MOTOROLA
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.
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.
Figure 2-2. Determination of X,Y Position
Freescale Semiconductor, I
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ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005
ARCHIVED BY FREESCALE SEMICONDUCT
OR,
INC.
2005