Self/mutual capacitance touch on 10-in. Screens; automotive-qualified

September 16, 2015 // By Graham Prophet
For use with touchscreens up to 10 in. diagonal, Atmel’s maXTouch mXT641T expands the company’s portfolio of automotive-qualified touchscreen controllers that handle requirements including hover and glove support, thick lens, single-layer and shieldless touch sensors

The mXT641T family is designed for capacitive touchpads and touchscreens from 5 to 10 inches nd are claimed to be the first auto-qualified self- and mutual-capacitance controllers meeting the AEC-Q100 standards for high reliability in harsh environments. The device uses Atmel’s Adaptive Sensing technology to enable dynamic touch classification, a feature that automatically and intelligently switches between self- and mutual-capacitance sensing to provide a seamless transition between a finger touch, hover, or glove touch. It eliminates the need for users to manually enable ‘glove mode’ in the operating system to differentiate between hover and glove modes. Adaptive Sensing is said to be resistant to water and moisture and ensures superior touch performance even in these harsh conditions.

The ICs support automotive requirements including hover and glove support in moist and cold environments, thick lens for better impact resistance, and single-layer shieldless sensor designs in automotive centre consoles, navigation systems, radio interfaces and rear-seat entertainment systems. The single-layer shieldless sensor design eliminates additional screen layers, delivering better light transparency resulting in lower power consumption along with an overall lower system cost for the manufacturer.