QTouch Library v3.0 offers increased channel support and a wider range of supported microcontrollers. In this version the entire AVR32 UC3A and UC3B series are supported.

Providing several library files for each device, supporting different numbers of touch channels, the QTouch Library v3.0 opens up for more flexibility and efficiency in your touch application. By selecting the library file supporting the number of channels needed, you will gain a more compact and efficient code using less RAM. The following number of channels is supported depending on your choice of microcontroller:
QTouch method: 4, 8, 16, 32 channels
QMatrix method : 8, 16, 32, 64 channels

Features
Capacitive touch sensing using patented charge-transfer signal acquisition for robust sensing
Support for a range of Atmel MCUs, tinyAVR®, megaAVR®, XMEGA™, UC3A, UC3B
Support for up to 64 sense channels
Supports both QTouch and QMatrix™ acquisition methods
Flexible choice of touch sensing functionallity (keys, sliders, wheels) in a variety of combinations
Includes Adjacent Key Suppression® (AKS™) technology for the unambiguous detection of key events
Fully debounced reporting of touch keys
256-level slider or wheels using only 3 channels
Common API across all library versions

官方下载地址：http://www.atmel.com/dyn/products/downloads_touch.asp?family_id=702