MICROCHIP AT42QT1011-TSHR

AT42QT1011 (QT1011) 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.

• Number of Keys: 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
• Package: 6-pin SOT23-6 RoHS compliant, 8-pin UDFN/USON RoHS compliant
• Signal processing: Self-calibration, auto drift compensation, noise filtering, Infinite max on-duration
• Patents: QTouch® (patented charge-transfer method), HeartBeat (monitors health of device)

• Control panels
• Consumer appliances
• Proximity sensor applications
• Toys
• Lighting controls
• Mechanical switch or button