Atmel® Corporation (San Jose, CA) has introduced charge-transfer, capacitive touchscreen controller ICs that are suitable for mobile phones and other personal electronics. Highly reliable standard Two Touch™ and Single Touch touchscreen controllers are available. Two Touch controller ICs 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.

Users can also implement the touch surface as a combination of touch keys and scrolling devices for additional flexibility – this is configurable by the host processor through the industry standard two-wire, I2C compatible interface. For single touch applications, a unique single layer sensor minimizes the mechanical stack. The reduction of scatter and absorption of the available backlight results in improved light transmission and reduced power consumption.

The first Two Touch devices, AT42QT5320 and AT42QT5480, support screen sizes of up to 8" with a 16:9 aspect ratio. The single touch devices, AT42QT4120 and AT42AT4160, support screen sizes of up to 4.3" with aspect ratios of 16:9 or 4:3. The AT42QT5320 comes in a 5×5 mm QFN package. The AT42QT5480 is available in 5×5 mm BGA, a 7×7 mm QFN, and a 10×10mm TQFP package and also supports up to four user-controlled GPOs. All packages are RoHS-compliant.

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Embedded Technology Magazine

This article first appeared in the March, 2009 issue of Embedded Technology Magazine.

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