QT60161B

      The QT60161B digital charge-transfer ("QT") QMatrix™ IC,which is designed to detect human touch on up 16 keys,coule be used in conjunction with a scanned, passive X-Y matrix.Also QT60161B is 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.That would be helpful and will project the keys through almost any dielectric, e.g. glass, plastic, stone,ceramic, and even wood, up to thicknesses of 5 cm or more.The user could make the key sizes,shapes and placement almost entirely arbitrary,and also mix them within a single panel of keys and can vary by a factor of 20:1 in surface area.The user could also set the sensitivity of each key individually via simple functions over the SPI or UART port.It need not to be reloaded with each powerup because the key setups are stored in an onboard.So that would save time.
      QT60161B has eight applications.The first one is security keypanels.The second one is appliance controls.The third one is ATM machines.The fourth one is automotive panels.The fifth one is industrial keyboards.The sixth one is outdoor keypads.The seventh one is touch-screens.The eighth one is machine tools.It also has some features.The first one is advanced second generation QMatrix controller.The second one is 16 touch keys through any dielectric.The third is 100% autocal for life - no adjustments required.The fourth is SPI Slave or Master/Slave interface to a host controller.The fifth one is parallel scan interface for electromechanical compatibility.The sixth one is keys individually adjustable for sensitivity, response time,and many other critical parameters.The seventh one is sleep mode with wake pin.The eighth one is synchronous noise suppression.The ninth one is mix and match key sizes & shapes in one panel.The tenth one is adjacent key suppression feature.The eleventh one is panel thicknesses to 5 cm or more.The twelfth is low overhead communications protocol.The last one is 44-pin TQFP package.
      Some absolute maximum specifications of QT60161B has been given into several points.The first one is operating temp which should be within -40 to +105^oC.The second one is storage temp which should be within -55 to +125^oC.The third one is VDD which shou be within -0.5 to +5.5V.The fourth one is max continuous pin current(any control or drive pin) which should be ±10mA.The fifth one is about short circuit duration to ground(any pin) which could be infinite.The sixth one is about short circuit duration to VDD(any pin) which could be infinite.The next one is about voltage forced onto any pin which should be -0.6V to (Vdd + 0.6) Volts.The next one is about frequency of operation which should be 16MHz.The last one is about eeprom maximum writes which could have 100,000 write cycles.