Atmel AT42QT2100 QTouch Touch Sensor IC DATASHEET Features Number of QTouch Keys: 0 to 7, one slider or one wheel Technology: Patented spread-spectrum charge-transfer Key Outline Sizes: 5 mm x 5 mm or larger (panel thickness dependent) widely different sizes and shapes possible Key Spacing: 6 mm or wider, center to center (panel thickness, human factors dependent) Key Design: Single solid or ring shaped electrodes wide variety of possible layouts Wheel Size: Typically 30 50 mm diameter, resistively interpolated wheel up to 80 mm diameter, typical width 12 mm Slider Size: Typically 50 100 mm length, typical width 12 mm Slider/Wheel Electrode Design: Choice of spatially interpolated (resistorless) or resistively interpolated design Slider can be an arc or other irregular shape Layers Required: One layer substrate electrodes and components can be on same side Substrates: FR-4, low cost CEM-1 or FR-2 PCB materials polyamide FPCB PET films, glass Electrode Materials: Copper, silver, carbon, ITO, virtually anything electrically conductive Panel materials: Plastic, glass, composites, painted surfaces (nonconductive paints) Adjacent Metal: Compatible with grounded metal immediately next to keys Panel Thickness: For keys, up to 15 mm glass, 10 mm plastic (key size dependent) For slider/wheel, up to 4 mm glass, 3 mm plastic Key Sensitivity: Adjustable via change in sampling capacitor (Cs) value 9554EAT4201/13 Interface: SPI 750 kHz, CHANGE and DRDY status indicator pins Moisture Tolerance: Increased moisture tolerance based on hardware design and firmware tuning Power: 2.0 V to 5.5 V Signal Processing: Self-calibration, autodrift compensation, noise filtering, patented Adjacent Key Suppression (AKS ) Package: 32-pin 5 x 5 mm MLF RoHS compliant 32-pin 7 x 7 mm TQFP RoHS compliant Applications: Portable devices, domestic appliances and A/V equipment, PC peripherals, office equipment AT42QT2100 DATASHEET 2 9554EAT4201/13