Motorola M68EZ328ADS user manual Appendix B Resistive Touch Panel Operation

Freescale Semiconductor, Inc.

ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005

Freescale Semiconductor, Inc.

APPENDIX B

RESISTIVE TOUCH PANEL OPERATION

ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005

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.

Figure 2-1. Resistive Touch Panel

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.

MOTOROLAM68EZ328ADS v2.0 USER’S MANUALB-30

For More Information On This Product,

Go to: www.freescale.com