Touch Sensor Capacitive 7 Key 2V to 5.5V Surface Mount 32-Pin MLF EP T/R

The AT42QT2100 (QT2100) is an easy-to-use sensor IC based on the patented charge-transfer (QT) principles for robust operation and ease of design. This device has many advanced features which provide for reliable, trouble-free operation over the life of the product. In particular the QT2100 features advanced self calibration, drift compensation, and fast thermal tracking. The QT2100 can tolerate some fluctuations in the power supply, and in many applications will not require a dedicated voltage regulator. The QT2100 is capable of detecting near-proximity or touch on up to seven electrodes and a slider/wheel. It allows electrodes to project sense fields through any dielectric such as glass or plastic. These electrodes are laid out as a scroller (slider or wheel), plus seven additional independent keys.

• 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 (resistor less) 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