Atmel AT42QT2160 Touch and Slide Control Panel IC

The AT42QT2160, from Atmel Corporation (Nasdaq: ATML), is a touch controller IC that combines touch key and touch slider functions in a single device. The AT42QT2160 can control up to 16 individual touch keys with a slider comprising between 2 and 8 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. Samples of the AT42QT2160 IC are available now in a 28-pin, 4 x 4mm QFN package. Pricing for the part is $0.98 each for quantities of 100ku per year.

AT42QT2160 Features

  • Up to 16 independent touch channels
  • Touch slider control (2 to 8 channels) with up to 8 bit resolution
  • 11 programmable interface lines – 3 can be configured as inputs or outputs, 8 are output only
  • Integrated LED control through 11 PWM outputs
  • Host programmability through an I²C compatible interface
  • Spread spectrum acquisition
  • Recalibration and Dynamic drift compensation
  • Adjacent Key Suppression (AKS)
  • Very low power operation
  • (< 1.0 µA @ 1.8 V in sleep mode)
  • Tiny 4mm x 4mm MLF package RoHS compliant

Atmel AT42QT2160 Touch Controller IC ApplicationThe AT42QT2160 is ideal for use as a multimedia HMI controller in mobile phones and consumer applications, such as personal media players, where it saves space, minimizes design time and allows the designer creative flexibility in laying out control keys. With its wide voltage range (1.8V to 5.5V DC) and low power requirements, it is well suited for other battery-driven applications, such as digital still cameras, PDA’s or handheld gaming devices.

The AT42QT2160 has 3 GPIOs with PWM capability and a further 8 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 interface (I(2)C compatible). To save system power, the chip provides a system Multi-Input 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 pre-defined input signals levels are reached. Touch button sensor electrodes, of arbitrary size (>6 x 6 mm) 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 3mm in thickness or plastic, up to 2.5mm thick.

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