32-KEY QMATRIX™ CHARGE-TRANSFER IC

The QT60320D digital charge-transfer (“QT”) QMatrix™ IC is designed to detect touch on up to 32 keys in a scanned X-Y matrix. It will project the keys through almost any dielectric, like glass, plastic, stone, ceramic, and even most kinds of wood, up to thicknesses of 5 cm or more. The touch areas are defined as simple 2-part interdigitated electrodes of conductive material, like copper, Indium-Tin-Oxide (ITO), or screened silver or carbon deposited on the rear of the control panel. Key sizes, shapes and placement are almost entirely arbitrary; sizes and shapes of keys can be mixed within a single panel of keys and can vary by a factor of 20:1 or more in area. The gain (sensitivity) and threshold of each key can be set individually via simple commands over the UART port, for example via the freeware QmBtn program. Key setups are stored internally in an onboard eeprom and do not need to be reloaded.

◆ Creates 32 ‘touch buttons’ through any dielectric
◆ 100% autocal for life - no adjustments required
◆ N key rollover: senses all 32 keys in parallel
◆ Keys individually adjustable for sensitivity
◆ Mix n match key sizes & shapes in one panel
◆ Tolerates a 20:1 variance in key sizes on a panel
◆ Panel thicknesses to 5 cm or more
◆ Back lit keys possible with ITO electrodes
◆ LED status function drives
◆ User-addressable multifunction drive pins
◆ User-addressable internal eeprom
◆ Simple, universal serial interface
◆ 5V single supply operation
◆ 44-pin TQFP package
◆ One square inch (6.5 square cm) of PCB required

APPLICATIONS -
● Automotive panels
● Machine tools
● ATM machines
● Touch-screens
● Appliance controls
● Outdoor keypads
● Security keypanels
● Industrial keyboards