s car touch screen displays increase in size, drivers want a touch experience like a mobile phone while operating. However, car screens need to pass strict head impact and vibration tests, so they have thicker cover glass, which may affect the performance of touch screens. Due to the increased screen size, touch screens are more likely to be interfered by other frequencies, such as AM radios and vehicle access control systems. All of these factors have become major issues in the design of modern automotive capacitive touch systems. To address these issues, Microchip Technology Inc. (Microchip Technology Corporation of America) introduced a new single-chip maXTouch touch screen controller series.
MXT2912TD-A, which uses nearly 3000 touch sensing nodes, and MXT2113TD-A, which supports more than 2,000 nodes, can bring customers the coveted automotive touch screen user experience. These new devices are based on MicrochipmaXTouch touchscreen technology widely used by manufacturers worldwide. Microchip's latest solution provides excellent signal-to-noise ratio performance, which can meet the requirements of thick glass cover plates, and can achieve multi-finger touch even when operating with gloves or when the screen is wet.
ATMXT2912TD-A-LQFP-176-w-pad
MICROCHIP-HMID-PR-MXT2912TD-7×5
As automakers use touch screens to replace mechanical switches on the dashboard for a more aesthetically pleasing interior design, operational safety and reliability have 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) rating specified in the ISO 26262 Passenger Car Functional Safety Specification.
The technology used in the new device enables adaptive touch detection using self-capacitance and mutual-capacitance detection methods, so it can recognize all touch actions and avoid false touch detection. They also use Microchip ’s new patented signal shaping technology to significantly reduce signal emissions, helping large screens using maXTouch controllers to meet CISPR-25 level 5 automotive electromagnetic interference requirements. The new touch screen controller also meets the automotive temperature range of Level 3 (-40 to + 85 ° C) and Level 2 (-40 to + 105 ° C), and has passed AEC-Q100 certification.
With the launch of the new maXTouch touchscreen controller, Microchip helps customers achieve full scalability, providing the industry's only complete and growing automotive-grade multi-size touchscreen controller portfolio. Designers can design multiple applications from small tablet devices to large displays under the same development environment, enjoying the same host software interface and excellent user experience, ultimately shortening the design cycle and reducing system and development costs.
Fanie Duvenhage, vice president of Microchip's Human Machine Interface Business Unit, said: "Microchip has been in the automotive industry for many years and is strong. Customer service is not just providing integrated circuits, but building partnerships with customers through a complex touch system supply chain. The display, sensors and all communication services meet customer expectations. Based on these achievements, the new device is in line with the current trend of increasing screen size and reducing finger separation in automobiles. "
Development tools
Eight specialized application and sensor design centers around the world help Microchip customers and partners accelerate the time to market for designs using maXTouch technology. Microchip's maXTouch technology experts have partnered with all major sensor, display and touch module manufacturers.
Each new product in the new maXTouch touchscreen controller family has a matching evaluation kit, including a printed circuit board (PCB) with a maXTouch touchscreen controller, a touch sensor mounted on a transparent 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, as well as cables, software and documentation. All devices are also compatible with maXTouch Studio, a complete software development environment that supports evaluation of maXTouch touchscreen controllers.
Supply
MXT2912TD-A and MXT2113TD-A devices are now available in samples and in mass production. They are available in LQFP176 and LQFP144 packages, respectively, and provide on-demand pricing services.