Quantum Introduces QTouch Series Charge Migration Sensing

Quantum Research recently announced the QT1100A-ISG, the newest member of the company's QTouch family of charge-transfer sensors, including digital controllers that detect proximity or touch motion. The device has a separate sensing area; all channels can be independently tuned through their respective serial ports, and can be configured to meet specific applications. Since only a few low-cost passive components are used per channel, the cost is minimized. Control panels using this technology are easy to seal, robust, and more reliable than those that use traditional capacitive sensors.

Reliable workability is ensured by automatic calibration, proximity key suppression (AKS) and burst mode spread spectrum modulation during the lifetime. The QT1100A-ISG automatically recalibrates each channel each time it is activated to compensate for the effects of gradual environmental changes and product aging. The AKS compares the signals received on each channel to ensure that only one primary touch buffer is used as a button touch, thereby avoiding a single touch but multiple key response misoperations. Especially for densely arranged button panels, such as button panels on small mobile devices. Spread spectrum modulation provides effective noise rejection to eliminate false triggers while reducing RF emissions. The sensor uses an external sync pin to reject the dominant frequency noise.

In addition, the QT1100A-ISG features a serial interface to the SPI and UART, as well as a scan port output for emulating the membrane keypad and enabling fault self-test to meet FMEA (failure mode and impact analysis) compatibility, making the device suitable for use. Household appliances, TV controls, instrument panels, pointer pointing devices and game consoles.

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