Touch Sensor Capacitive 1 Key 1.8V to 5.5V Surface Mount 20-Pin VQFN

The AT42QT1050 is a QTouchADC sensor driver. The device can sense from one to five keys, dependent on mode. The QT1050 includes all signal processing functions necessary to provide stable sensing under a wide variety of changing conditions, and the outputs are fully debounced. Only a few external parts are required for operation and no external Cs capacitors are required. The QT1050 modulates its bursts in a spread-spectrum fashion in order to heavily suppress the effects of external noise, and to suppress RF emissions. The QT1050 uses a QTouchADC method of acquisition. This provides greater noise immunity and eliminates the need for external sampling capacitors, allowing touch sensing using a single pin.

• Configurations:
  • Comms mode
• Number of Keys:
  • 1 to 5 keys (or 1 to 4 keys plus a Guard Channel)
• Technology:
  • Patented spread-spectrum QTouchADC charge-transfer
• Key Outline Sizes:
  • 6 mm × 6 mm or larger (panel thickness dependent); widely different sizes and shapes possible
• Layers Required:
  • One
• Electrode Materials:
  • Etched copper; Silver; Carbon; Indium Tin Oxide (ITO)
• Panel Materials:
  • Plastic; Glass; Composites; Painted surfaces (low particle density metallic paints possible)
• Panel Thickness:
  • Up to 10 mm glass (electrode size dependent)
  • Up to 5 mm plastic (electrode size dependent)
• Key Sensitivity:
  • Individually settable using simple commands over I2 C interface
• Interface:
  • I2C slave mode (400 kHz). Discrete detection outputs
• Signal Processing:
  • Self-calibration
  • Auto-drift compensation
  • Noise filtering
  • Adjacent Key Suppression® (AKS®) – up to three groups possible
• Moisture Tolerance:
  • Increased moisture tolerance based on hardware design and firmware tuning
  • Power Saving
  • Low Power (LP) mode supports both Low Power and Deep Sleep modes
• Power:
  • 1.8 V to 5.5 V
• Package:
  • 12-ball WLCSP RoHS-compliant IC
  • 20-pin VQFN RoHS-compliant IC