Touch Sensor 1 Key 1.8V to 5.5V Surface Mount 6-Pin SOT-23 T/R

The AT42QT1011 is a digital burst mode charge-transfer (QT) sensor that is capable of detecting near proximity or touch, making it ideal for implementing touch controls. With the proper electrode and circuit design, the self-contained digital IC will project a touch or proximity field to several centimeters through any dielectric like glass, plastic, stone, ceramic, and even most kinds of wood. It can also turn small metal-bearing objects into intrinsic sensors, making them responsive to proximity or touch. This capability, coupled with its ability to self-calibrate, can lead to entirely new product concepts. The QT1011 is designed specifically for human interfaces, like control panels, appliances, toys, lighting controls, or anywhere a mechanical switch or button may be found. It includes all hardware and signal processing functions necessary to provide stable sensing under a wide variety of changing conditions. Only a single low-cost capacitor is required for operation.

• One – configurable as either a single key or a proximity sensor
• Technology:
• Patented spread-spectrum charge-transfer (direct mode)
• Key outline sizes:
• 6 mm × 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 12 mm glass, 6 mm plastic (electrode size and Cs dependent)
• Key sensitivity:
• Settable via capacitor (Cs)
• Interface:
• Digital output, active high
• Moisture tolerance:
• Increased moisture tolerance based on hardware design and firmware tuning
• Operating Voltage:
• 1.8 V – 5.5 V; 17 µA at 1.8 V typical