Quantum Research offers a charge-transfer sensing IC for portable applications

Southampton, UK — Quantum Research Group has developed an 8-key touch sensor IC, the QT1080-ISG , that consumes just 40µA at 3V in low power mode. Designed primarily for use in mobile phones, MP3 players, PC peripherals, remote controls and similar consumer devices, it enables 8 touch keys through almost any panel material to facilitate a great variety of designs. Other features include fully debounced results, lifetime automatic calibration, adjacent key suppression, low noise operation and a fast detection mode for use in applications where a simple touch slider is needed. When used to implement individual touch keys, the sensitivity of each channel can be independently tuned simply by changing a capacitor. Capacitive touch sensors have been notoriously prone to drift and unreliable operation. The QT1080-ISG charge-transfer chip provides automatic drift compensation over-the life of the device to suppress false detections caused by changes in temperature, humidity or other environmental effects. The device also self-calibrates on power-up and automatically recalibrates after long detections so that keys never freeze due to foreign objects in contact with the sensing surface or other unwanted influences. It is available now, priced at US$1 for high volume applications. Only a handful of external passive components are required to produce an eight key control panel, leading to a very cost effective solution. Quantum Research Group Ltd , Southampton, UK.

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