• Four discrete outputs indicating individual key touch
• Technology: Patented spread-spectrum charge-transfer (direct mode)
• Electrode Design: Simple self-capacitance style
• Electrode Materials: Etched copper, silver, carbon, Indium Tin Oxide (ITO)
• Electrode Substrates: PCB, FPCB, plastic films, glass
• Panel Materials: Plastic, glass, composites, painted surfaces (low particle density metallic paints possible)
• Panel Thickness: Up to 10 mm glass, 5 mm plastic (electrode size dependent)
• Key Sensitivity: Fixed key threshold, sensitivity adjusted via sample capacitor value
• Patented Adjacent Key Suppression® (AKS®) technology to enable accurate key detection
• Interface: Pin-per-key outputs, plus debug mode to observe sensor signals
• Moisture Tolerance: Increased moisture tolerance based on hardware design and firmware tuning
• Signal Processing: Self-calibration, auto drift compensation, noise filtering
• Applications: Mobile, consumer, white goods, toys, kiosks, POS
• Power: 1.8 V – 5.5 V
• Package: 20-pin 3 x 3 mm VQFN RoHS compliant

Digital burst mode, charge-transfer capacitive sensor driver designed for touch-key applications. It can sense from one to four keys-one to three keys can be disabled by not installing their respective sense capacitors. The device includes all signal processing functions necessary to provide stable sensing under a wide variety of changing conditions. The outputs are fully debounced. Only a few external parts are required for operation. The device modulates its bursts in a spread-spectrum fashion in order to heavily suppress the effects of external noise and to suppress RF emissions.