• 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)
• Up to 10 mm glass (electrode size dependent)
• Up to 5 mm plastic (electrode size dependent)
• Key Sensitivity: Individually settable using simple commands over I2C interface
• Interface: I2C slave mode (400 kHz). Discrete detection outputs
• 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
• 12-ball WLCSP RoHS-compliant IC
• 20-pin VQFN RoHS-compliant IC

The Atmel(R) AT42QT1050 is a QTouchADC(TM) 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.