3M™ MicroTouch™ System SCT3nnnEX Integration Guide
15
3M Touch Systems, Inc. Proprietary Information
– TSD-19-278
CHAPTER 2
Sensor Design Considerations
Design Considerations
The 3M™ MicroTouch™ SCT sensors are available in a variety of sizes, for use on a
variety of displays. These sensors come in three different configurations: one with a 5-
pin connector to attach to an EX11
n
series controller; one mated with an EX11
n
series
controller; and one with a 12-pin NOVRAM connector for EX12
n
series controllers.
The standard SCT sensor is designed and produced without a backshield and takes
advantage of the superior sensitivity and noise rejection of EX controllers. Refer to the
EX Controller Reference Guide
for information on how to select signal frequency for
best EMI rejection.
Electrical Considerations
EMI and Shielding
The front surfaces of displays carry potentials that fluctuate at the harmonics of display
scan frequencies. The EX series 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
