FEATURES
These digital charge-transfer (“QT”) QMatrix™ ICs are designed to detect human touch on up to 16 or 24 keys when used with a scanned, passive X-Y matrix. They will project touch keys through almost any dielectric, e.g. glass, plastic, stone, ceramic, and even 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 or screened silver or carbon deposited on the rear of a 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 in surface area. The sensitivity of each key can be set individually via simple functions over the serial port by a host microcontroller. Key setups are stored in an onboard eeprom and do not need to be reloaded with each powerup.
● Second generation charge-transfer QMatrix technology
● Keys individually adjustable for sensitivity, response time, and many other critical parameters
● Panel thicknesses to 50mm through any dielectric
● 16 and 24 touch key versions
● 100% autocal for life - no adjustments required
● SPI slave interface
● Adjacent key suppression feature
● Synchronous noise suppression feature
● Spread-spectrum modulation - high noise immunity
● Mix and match key sizes & shapes in one panel
● Low overhead communications protocol
● FMEA compliant design features
● Negligible external component count
● Extremely low cost per key
● +3 to +5V single supply operation
● 32-pin lead-free TQFP package
APPLICATIONS
● Security keypanels
● Industrial keyboards
● Appliance controls
● Outdoor keypads
● Appliance controls
● Outdoor keypads
● Automotive panels
● Machine tools
Microchip Technology Inc. is a leading provider of microcontroller and analog semiconductors, providing low-risk product development, lower total system cost and faster time to market for thousands of diverse customer applications worldwide. Headquartered in Chandler, Arizona, Microchip offers outstanding technical support along with dependable delivery and quality.