As the size of automotive touch screen displays increases, drivers desire a touch-like experience like a mobile phone during operation. However, automotive screens require strict head impact and vibration testing, and therefore have thicker cover glass, which can affect the performance of the touch screen. Due to the increased screen size, the touch screen is more likely to be subject to interference from other frequencies, such as AM radios and vehicle access systems. All of these factors have become major issues in designing modern automotive capacitive touch systems. To address these issues, Microchip Technology Inc. has introduced a new family of single-chip maXTouch touchscreen controllers.
The MXT2912TD-A with nearly 3,000 touch sensing nodes and the MXT2113TD-A with more than 2,000 nodes provide customers with the dream of a car touch screen user experience. These new devices are based on Microchip maXTouch touchscreen technology, which is widely adopted by manufacturers around the world. Microchip's newest solutions offer superior signal-to-noise performance for thick glass cover applications, enabling multi-finger touch even when wearing gloves or when the screen is wet.
As car manufacturers use touch screens instead of mechanical switches on the dashboard to get a more aesthetically pleasing interior design, operational safety and reliability become more important. The MXT2912TD and MXT2113TD devices combine self-diagnostics and sensor diagnostics to continuously monitor the integrity of the touch system. These intelligent diagnostic functions meet the "Automotive Safety Integrity Level" (ASIL) grading specifications specified in the ISO 26262 Passenger Vehicle Functional Safety Specification.
The technology used in the new device enables adaptive touch detection using self-capacitance and mutual capacitance detection, so it can recognize all touch actions and avoid false touch detection. They also leverage Microchip's new patented signal shaping technology to significantly reduce signal emissions and help meet the CISPR-25 Level 5 automotive electromagnetic interference requirements with the large screen size of the maXTouch controller. The new touch screen controllers also meet the Class 3 (-40 to +85°C) and Class 2 (-40 to +105°C) automotive temperature ranges and are AEC-Q100 certified.
With the introduction of the new maXTouch touchscreen controller, Microchip is helping customers achieve full scalability, offering the industry's only complete and growing portfolio of automotive-grade multi-size touchscreen controllers. Designers can design applications ranging from small tablet devices to large displays in the same development environment, with the same host software interface and superior user experience, ultimately reducing design cycles while reducing system and development costs.
Fanie Duvenhage, vice president of Microchip's Human Interface Business Unit, said: "Microchip has been in the automotive industry for many years and is strong. Customer service is not just about providing integrated circuits, but building partnerships with customers through complex touch system supply chains, so we offer The display, sensors and all communication services are able to meet customer expectations. The new device is based on these achievements, in line with the current trend of increased car screen size and reduced finger separation."
Eight professional application and sensor design centers around the world help Microchip customers and partners accelerate the adoption of maXTouch technology. Microchip's maXTouch technology experts have partnered with all major sensor, display and touch module manufacturers.
Each of the new maXTouch touchscreen controller families comes with an evaluation kit that includes a printed circuit board (PCB) with a maXTouch touchscreen controller, a touch sensor mounted on a clear glass cover, and a sensor display The required flat printed circuit (FPC), the converter PCB required to connect the kit to the host via USB, and the cables, software, and documentation. All devices are also compatible with maXTouch Studio, a complete software development environment that supports the evaluation of the maXTouch touchscreen controller.