AT42QT1012

The AT42QT1012 from Microchip is a versatile one-channel toggle-mode touch sensor integrated circuit. It is designed to function as either a single key or a proximity sensor, featuring programmable auto-off delay and external cancel capabilities. The device utilizes patented spread-spectrum charge-transfer technology for reliable touch detection.

This sensor IC supports various electrode designs, including solid or ring shapes, and can be implemented with one PCB layer. It is compatible with electrode materials such as etched copper, silver, carbon, and Indium Tin Oxide (ITO), and can be mounted on PCB, FPCB, plastic films, or glass substrates. The AT42QT1012 offers good moisture tolerance and includes signal processing features like self-calibration, auto drift compensation, and noise filtering.

Operating from a supply voltage of 1.8V to 5.5V, the AT42QT1012 consumes 32 µA at 1.8V. It provides a digital output that is hardware configurable for active high or active low states. The device is available in compact 6-pin SOT23-6 (3 x 3 mm) and 8-pin UDFN/USON (2 x 2 mm) packages, both of which are RoHS compliant. It can detect touch through panel materials like plastic, glass, composites, and painted surfaces, with panel thickness up to 12 mm for glass and 6 mm for plastic.