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Atmel XSense Touch Sensor AT42QT1481 descriptions:
The Atmel® AT42QT1481 is a capacitive touch controller with configurable 48-QTouch buttons. The Atmel QMatrix® sensing algorithm (mutual capacitance) enables the user to achieve more buttons than there are pins because of this matrix layout. This capability makes the device ideal for home appliance customers that require high button counts at low cost. The button sensors can be constructed in a variety of shapes and sizes. The device includes all signal processing functions necessary to provide stable sensing under a wide variety of changing conditions and frequencies
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