Atmel Automotive Touch

Atmel Enhances Touch Capabilities for In-Car Control Systems


Industry's first automotive touchscreen controller supporting shieldless sensors and gloved operation

The Atmel® maXTouch® family, known for its superior performance and rich feature set, is now qualified for automotive applications, such as automotive touchscreens and touchpads used in center stack displays, navigation systems, radio human-machine interfaces (HMIs) and rear-seat entertainment systems.

maXTouch devices provide unlimited touch identification, fast response time, exacting precision, robust operation and low power consumption to touch-based designs.

The mXT768E and mXT540E automotive-qualified family members provide dedicated functionalities that meet specific automotive requirements. For example, due to the devices' superior noise immunity, designers can create shieldless sensor designs, thus reducing system complexity, cost and power consumption.

Embedded filters realized in hardware and firmware enable touchscreens supporting gloved finger operation―a key requirement in modern automotive HMI interfaces. Embedded single- and dual-gesture algorithms and the palm suppression functionality allow detection and suppression of unintended touches, such as a resting hand on the screen.


Key maXTouch Family Features

  • Seamless multi-touch performance for up to 16 touches
  • Electrode grid configurations of up to 24 X and 32 Y lines (768 channels)
  • Support for mutual capacitance and self-capacitance sensing
  • 12-bit x 12-bit touch position reporting
  • High responsiveness
  • Industry-leading current consumption
  • Sophisticated touch processing, including palm suppression
  • Noise rejection to enable reliable operation in harsh environments

Automotive Features

  • Fully automotive-qualified (Grade 2), operating within the temperature range of -40 up to +105 degree Celsius
  • Support for shieldless sensor design for thinner stacks, resulting in reduced system complexity, lower cost, lower power consumption and higher product yield
  • High signal-to-noise ratio (80:1), enabling gloved-hand operation
  • Support for single- and dual-touch gestures (pinch, stretch, etc.); unintended touches such as a resting hand on the screen are classified and rejected
  • 150Hz scan speed, which supports character recognition for alphanumeric inputs to the automotive HMIs

Automotive Application Areas

  • Center stack displays
  • Navigation systems
  • Radio HMI
  • Rear-seat entertainment systems