Combining touch key and touch slider functions, Atmel’s AT42QT2160 touch controller controls up to 16 individual touch keys with a slider comprising between 2 and 8 of the touch key channels. The device controls up to 11 LEDs through a PWM output function and has 3 GPIOs with 8 shared output ports through a 2-wire interface (I2C compatible). The 28-pin 4-mm2 QFN-packaged controller uses charge-transfer technology yielding a voltage range from 1.8 to 5.5 VDC, adjacent key suppression, and a system multi-input wake-up function. The device's touch button sensor electrodes that measure less than 6 mm2 are formed from copper pads on the printed circuit board or a flexible circuit. The touch surface can be made from glass up to 3 mm thick or plastic up to 2.5 mm thick. Pricing is $0.98 in 100,000 quantities.
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