Atmel has announced the AT42QT2160 – a touch controller IC combining touch key and touch slider functions in a single device. It can control up to 16 individual touch keys with a slider comprising between two and eight of the touch key channels. In addition, the chip can also control up to 11 LEDs through a PWM output function that is controlled by the host, eliminating the need for an external LED controller.
With this combination of functions, this device is ideal for use as a multimedia HMI controller in mobile phones and consumer applications, such as personal media players, where it saves space, minimises design time and allows the designer creative flexibility in laying out control keys. With its wide voltage range (1,8 V to 5,5 V d.c.) and low power requirements, it is well suited for other battery-driven applications, such as digital still cameras, PDAs and handheld gaming devices.
The AT42QT2160 uses patented charge-transfer technology. This provides robust and reliable performance, high immunity to EMI through spread-spectrum modulation and filtering algorithms, calibration of the device over life and user-defined sensitivity thresholds for individual keys. An additional patented function, adjacent key suppression (AKS), intelligently suppresses signals present from nearby keys so that only intended keys register a touch.
The AT42QT2160 has three GPIOs with PWM capability and a further eight shared ports that provide additional standard outputs for the host without adding cost or using an extra I/O expansion device with PWM capability. Host configurability is achieved via a 2-wire I²C-compatible interface. To save system power, the chip provides a system multiinput wake-up (MIWU) function. This can trigger a reaction from the host or other system components via the 2-wire interface, or using a dedicated output pin, when predefined input signals levels are reached. Touch button sensor electrodes, of arbitrary size and shape, are usually 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 in thickness or plastic, up to 2,5 mm thick.
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