Motorola M68EZ328ADS - Manual (Page 31)

MOTOROLA M68EZ328ADS v2.0 USER’S MANUAL B-30
APPENDIX B
RESISTIVE TOUCH PANEL OPERATION
M68VZ328ADS features pen input through a resistive-film sensing panel. This type of panel
provides high flexibility by accepting input form any kind of stimulus including fingers, which
is most suitable for portable use. User can select a specific touch panel or order an LCD
module which includes a touch resistive panel. This section describes the basic concepts of
pen input and the required interface with the M68VZ328ADS.
B.1 GENERAL CONCEPTS OF RESISTIVE PANELS
Basically, resistive panel consists of two transparent resistive layers separated by insulating
spacers as shown in Figure 2-1.
Transparent Resistive Layer - resistive material such as an indium tin oxide (ITO) film is
coated on dielectric (insulating) substrate, usually glass on bottom and plastic on top for
actuation.
Bars - highly conductive material such as silver ink, about 1000 times more conductive than
ITO.
Spacers - Non-conducting ink, adhesive, or other material such as Mylar is used to separate
the two opposite conductive layers.
Figure 2-1. Resistive Touch Panel
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2005