QT  -  Series DataSheet
AT42QT100A  -  QTouch? Charge Transfer IC  -  Atmel  -  Touch Technology

Features
• Number of Keys:
– One
• Technology:
– Patented spread-spectrum charge-transfer
• Key outline sizes:
– 6 mm x 6 mm or larger (panel thickness dependent); widely different sizes and shapes possible
• Electrode design:
– Solid or ring electrode shapes
• PCB Layers required:
– One
• Electrode materials:
– Etched copper, silver, carbon, Indium Tin Oxide (ITO)
• Electrode substrates:
– PCB, FPCB, plastic films, glass
• Panel materials:
– Plastic, glass, composites, painted surfaces (low particle density metallic paints possible)
• Panel thickness:
– Up to 50 mm glass, 20 mm plastic (electrode size and Cs dependent)
• Key sensitivity:
– Settable via capacitor (Cs)
• Interface:
– Digital output, active high
• Moisture tolerance:
– Good
• Power:
– 2V – 5.5V; 6.5 μA at 2.0V typical
• Package:
– 6-pin WSON RoHS compliant
– 10-pin MSOP RoHS compliant (available to special order with 50K MOQ)
• Signal processing:
– Self-calibration, auto drift compensation, noise filtering
• Applications:
– Control panels, consumer appliances, toys, lighting controls, mechanical switch or button
• Patents:
– QTouch™ (patented charge-transfer method)