Atmel optimizes QTouch for application-specific devices
This family of touch controllers includes a touch sensing architecture that eliminates the need for any external components and uses only one I/O pin for each sensing channel. This architecture also supports a new capacitive sensing method with a faster scan time, lower current consumption and less sensitivity to power supply fluctuations than previous generation devices.
The company says the devices add greater value and differentiation for customers’ end products, with features that provide a lower barrier of entry for integrating touch user interfaces into a variety of applications including home appliances, automotive control panels, TVs, remote controls, set-top boxes, LCD monitors and many others.
These ready-to-use touch sensing controllers support up to 12 sensor channels, 1.8V-5.5V operating voltage range and an I2C-compatible communications interface. In addition, this family includes Adjacent Key Suppression (AKS) support, self-calibration, auto-drift compensation, noise filtering, and a selectable sleep interval. The first device of this family is the AT42QT1070 which supports 7 channels and is in full production now. The second device in the family will be the AT42QT2120 with 12 channels and includes support for a slider or wheel interface. The AT42QT2120 will be in production Q2 2011. Both devices may be configured for stand-alone mode or communications mode.