Atmel has a range of charge-transfer, capacitive touchscreen controller ICs, called Two Touch, which can track and report one or two simultaneous touches as separate X and Y positions.

Common user initiated gestures, including tap, double tap, flick and drag, as well as two touch gestures such as zoom in, zoom out and rotate are implemented in the touchscreen controllers.

As a result designs can incorporate a range of user interface functions such as resizing and rotation of on-screen graphics, as well as allowing a two finger gesture to replace multiple levels of menu access.

Configurable by the host processor through the industry standard two-wire, I2C compatible interface, the first Two Touch devices, AT42QT5320 and AT42QT5480, support screen sizes of up to 8in with a 16:9 aspect ratio.

The single touch devices, AT42QT4120 and AT42AT4160, support screen sizes of up to 4.3in with aspect ratios of 16:9 or 4:3.

The AT42QT5320 comes in a 5x5 mm QFN package; the AT42QT5480 is available in 5x5 mm BGA, a 7x7 mm QFN and a 10x10mm TQFP package and also supports up to four user controlled GPO’s. All packages are RoHS compliant.

The AT42QT4160 and AT42QT4120 single touch devices can operate through up to 3mm plastic and 4mm glass panel thicknesses. The devices are available in a 5x5 mm QFN RoHS compliant package.

More information: www.atmel.com