The grounded target provides a non-destructive path for ESD energy.The sensor is electrically isolated from the environment limiting noise, proximity and crosstalk problems.The capacitive touch interface (electronics and software) detects the change in capacitance and reports the press to the system. When the user presses on the target, it deforms slightly (<10 µm) toward the sensor, creating a detectable change in the sensor capacitance. The difference in a MOC design is the replacement of the user’s finger with a conductive target layer, suspended over the capacitive touch sensor by a thin spacer. The basis of any MOC touch system is a standard mTouch™ capacitive sensor, electronics and software. General Review of Metal Over Cap Technology The layout of this app note includes the general review of Metal over Cap technology, choosing an appropriate fascia and target design, choosing a design implementation for a spacer layer, backlighting methods, relocating the PCB, trouble-shooting problems, vendors, and the sticky busines of adhesion. This application note discusses the advantages, techniques, limitations, and general recommendations of Metal Over Capacitive technology in sensors.
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