QT60248 Datasheet | QUANTUM

.. l Q QProx™ QT60168, QT60248 16, 24 KEY QMATRIX™ ICs /RST X0 Y2A Y2B Y0A Y1A z Second generation charge-transfer QMatrix technology z Keys individually adjustable for sensitivity, response time, and many other critical parameters z Panel thicknesses to 50mm through any dielectric z 16 and 24 touch key versions z 100% autocal for life - no adjustments required z SPI slave interface z Adjacent key suppression feature z Synchronous noise suppression feature z Spread-spectrum modulation - high noise immunity z Mix and match key sizes & shapes in one panel z Low overhead munications protocol z FMEA pliant design Features z Negligible external ponent count z Extremely low cost per key z +3 to +5V single supply operation z 32-pin lead-free TQFP package X3 X4 VSS VDD VSS VDD X5 X6 1 2 3 4 5 6 7 8 32 31 30 29 28 27 26 25 24 23 X1 X2 VREF X7 Y1B Y0B n/c VSS VDD SYNC VDD SCK QT60248 QT60168 TQFP-32 22 21 20 19 18 17 9 10 11 12 13 14 15 16 SMP S_SYNC /SS MISO MOSI DRDY APPLICATIONS y Security keypanels y Industrial keyboards y Appliance controls y Outdoor keypads y ATM machines y Touch-screens y Automotive panels y Machine tools 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...