MICROCHIP AT42QT1010-TSHR

The AT42QT1010 is a digital burst mode charge-transfer sensor that is capable of detecting near proximity or touch, making it ideal for implementing touch controls. The QT1010 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.

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.

• 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
• Patents: QTouch technology (patented charge-transfer method) HeartBeat (monitors health of device)

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