CHAPTER 2
Touch Screen Design Considerations
Design Considerations
ClearTek™ II touch screens are available in a variety of sizes, for use on a variety of
displays. These touch screens come in three different configurations: one with a 5-pin
connector to attach to an EX II 7700 series controller; one mated with an EX II 7700
series controller; and one with a 12-pin NOVRAM connector for EX II 1700 and EX II
5700 series controllers.
Standard ClearTek II is designed and produced without a backshield and takes advantage
of the superior sensitivity and noise rejection of EX II controllers. Refer to the
EX II
Controller Reference Guide
for how to select signal frequency for best EMI rejection.
Electrical Considerations
EMI and Shielding
The front surfaces of flat panel displays carry potentials that fluctuate at the harmonics of
display scan frequencies. EX II controllers default to a frequency (95.7 kHz) selected for
best rejection of common LCD frequencies. Refer to the
MT7 Software User Guide
for
additional information on how to change frequency. All technical documentation is
available from the 3M Touch Systems website at
3M Touch Systems Proprietary Information
Summary of Contents for MicroTouch ClearTek II
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