Description

The QT1110A245 is a digital burst mode charge-transfer capacitive sensor driver designed for touch-key applications. It can be used to construct keys in different shapes and sizes. The device offers up to 11 QTouch channels and can measure keys triggered by a signal or at regular intervals. The raw data for key touches can be read over the SPI interface. The device configuration can be stored in EEPROM. It uses patented spread-spectrum charge-transfer technology and supports different key sizes and shapes. The QT1110A245 is compatible with various electrode substrates and panel materials. It has good moisture tolerance and operates at a voltage range of 3V to 5.5V. The package options include 32-pin 5 x 5 mm MLF and 32-pin 7 x 7 mm TQFP. It features self-calibration, auto drift compensation, noise filtering, and AKS technology for accurate key detection. The QT1110A245 is suitable for consumer and industrial applications, such as TV and media players.

Specifications and features

• Sensor Keys: Up to 11 QTouch channels
• Data Acquisition:
  • Measurement of keys triggered either by a signal applied to the SYNC pin or at regular intervals timed by the AT42QT1110s internal clock
  • Keys measured sequentially or in parallel groups for better performance or faster operation
  • Raw data for key touches can be read as a report over the SPI interface
• Discrete Outputs:
  • Configurable "Detect" outputs indicating individual key touch (7-key mode)
• Device Setup: Device configuration can be stored in EEPROM
• Technology: Patented spread-spectrum charge-transfer (direct mode)
• Key Outline Sizes: 6 mm x 6 mm or larger (panel thickness dependent); widely different sizes and shapes possible, including solid or ring shapes
• Key Spacings: 7 mm center to center or more (panel thickness dependent)
• Layers Required: One
• 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: Individually settable via simple commands over serial interface
• Adjacent Key Suppression® (AKS™): Patented AKS technology to enable accurate key detection
• Interface: Full-duplex SPI slave mode (1.5 MHz), "change" pin, discrete detection outputs
• Moisture Tolerance: Good
• Power: 3V ~ 5.5V
• Package: 32-pin 5 x 5 mm MLF RoHS compliant, 32-pin 7 x 7 mm TQFP RoHS compliant
• Signal Processing: Self-calibration, auto drift compensation, noise filtering, AKS technology

Application Scenarios

The QT1110A245 is suitable for consumer and industrial applications, such as TV and media players. It can be used in various touch-key applications and supports different key sizes and shapes. The device is designed to provide accurate key detection and can be used with different electrode substrates and panel materials.

Comparison

• Digital burst mode charge-transfer capacitive sensor driver
• Up to 11 QTouch channels
• Measurement of keys triggered either by a signal or at regular intervals
• Keys measured sequentially or in parallel groups for better performance or faster operation
• Raw data for key touches can be read over the SPI interface
• Configurable "Detect" outputs indicating individual key touch
• Device configuration can be stored in EEPROM
• Patented spread-spectrum charge-transfer technology
• Compatible with various electrode substrates and panel materials
• Good moisture tolerance
• Self-calibration, auto drift compensation, and noise filtering
• AKS technology for accurate key detection
• Full-duplex SPI slave mode and discrete detection outputs

• Not suitable for all types of touch-key applications