AT42QT2160 – Touch and Slide Control

The AT42QT2160 implements 16 touch channels and a slider (using 2 to 8 channels) as well as LED control, IO expansion and a 2-wire serial interface, compatible to the industry standard I²C bus.

The IC is ideal for use as a small control panel processor in battery driven consumer devices such as mobile phones, personal media players, PDAs, digital picture frames and other mobile appliances. It is based on Atmel's QMatrix™ and QSlide™ technologies, has very low power requirements and provides a very wide range of host programmable input/output configurations.

The EVK2160A allows the user to evaluate all functions of the AT42QT2160 touch sense controller. The kit provides a convenient reference design and allows the user to visualize discrete touch buttons or a touch slider LED control.

This kit is for the evaluation and development of applications using the AT42QT2160-MMU ('QT2160') 16 Key QMatrixTM Integrated Circuit (IC). In this example, the QT2160 is shown working in a battery powered 'Standalone' mode, but can be connected to a PC and/or User application by simple modifications to the EVK2160A Evaluation Board.

Applications Personal media players PDAs Laptops Digital still cameras Digital picture frames Audio and video equipment

Features Up to 16 independent touch channels Touch slider control (2 to 8 channels) with up to 8 bit resolution Tiny 4mm x 4mm MLF package RoHS compliant 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) 11 programmable interface lines – 3 can be configured as inputs or outputs, 8 are output only

Long Touch Sliders Made Simple

The QT2160 provides a way of integrating a slider into your product at very low cost. The sensing elements can be made from almost any conductive material and can be integrated into the casing of the product in many novel ways. They can be made much longer than a conventional slider mechanism, can provide a better user experience and, with no moving parts, have the potential for greater reliability.

Easy, Low Cost Implementation

The IC is supplied in a 28-pin 4mm x 4mm RoHS compliant package and requires only a small number of additional components for a practical circuit.

Input/Output Options

For such a small device, the QT2160 provides you with an exceptional number of options for interfacing with external devices. When configured as inputs, the interface lines can be connected to mechanical switches or logic signals. You can use them to provide control inputs, or to provide a multi-input host wake-up function. Or you can configure them as PWM capable outputs and use them to provide key illumination and visual feedback with touch related PWM control of LED indicators. The 3 I/O pins and 8 shared output pins provide you with many other interesting possibilities when they are used in combination.

Environmental Specifications
Operating Temperature	-40 to +85°C
Storage Temperature	-55 to +125°C

Recommended Operating Conditions
Power Supply	VDD 1.8V to 5.5V
Power Supply Ripple+Noise >1 MHz	±25 mV
Power Supply Ripple+Noise <1 MHz	±50 mV

DC Specifications
Supply Current Sleep Mode	1.5 μA @ 1.8V (typical)
Supply Current Run Mode	476 μA @ 1.8V (typical)

Package Options
28-pin	4 mm x 4 mm	QFN	RoHS compliant