Atmel AT42QT1481 48-Key QMatrix FMEA IEC/EN60730 Touch Sensor IC DATASHEET Features Number of keys: Up to 48 Technology: Patented charge-transfer (transverse mode), with frequency hopping Key outline sizes: 6 mm 6 mm or larger (panel thickness dependent) widely different sizes and shapes possible Key spacings: 8 mm or wider, center to center (panel thickness dependent) Electrode design: Two-part electrode shapes (drive-receive) wide variety of possible layouts Layers required: One layer (with jumpers), two layers (no jumpers) Electrode materials: PCB, FPCB, silver or carbon on film, ITO on film Panel materials: Plastic, glass, composites, painted surfaces (low particle density metallic paints possible) Adjacent Metal: Compatible with grounded metal immediately next to keys Panel thickness: Up to 50 mm glass, 20 mm plastic (key size dependent) Key sensitivity: Individually settable via simple commands over serial interface Signal processing: Self-calibration, auto drift compensation, noise filtering, Adjacent Key Suppression Interfaces: UART SPI slave (4 MHz maximum clock rate) STATUS indication pin Debug output FMEA compliant design features IEC/EN/UL60730 compliant design features UL approval VDE compliance For use in both class B and class C safety-critical products 9621EXAT4207/2014 Detects and Reports Key Failure Power: +4.75 to 5.25 V Package: 44-pin 10 10 mm TQFP RoHS compliant AT42QT1481 DATASHEET 2 9621EXAT4207/2014