DSP, Micros & Memory


Smallest automotive maXTouch controllers

29 July 2020 DSP, Micros & Memory

To help enhance and ease today’s driving experience, automotive manufacturers are implementing additional touch displays beyond the centre infotainment display (CID). Supporting the application of these secondary displays with advanced features, Microchip Technology announced the extension of its maXTouch portfolio with the new MXT288UD touch controller family, with the industry’s smallest automotive grade packaged touchscreen controllers.

The MXT288UD-AM and the MXT144UD-AM devices offer low power mode, weatherproof operation and glove touch detection in multi-function displays, and touch pad and smart surfaces for vehicles, motorcycles, e-bikes and car-sharing services.

Secondary touch surfaces can be placed in both the interior of a car and exterior of a motor vehicle, for example on handlebars, doors, electronic mirrors, control knobs and the steering wheel, or between seats or in an armrest. With the MXT288UD family’s small

7 x 7 mm automotive grade VQFN56 package, tier one suppliers can now reduce board space by 75 percent and greatly minimise the overall bill of materials (BoM) for these compact applications.

The family’s low power wait-for-touch mode consumes less than 50 µA, remaining responsive for the user even if the display switches off to save power or to avoid disturbing the driver at night. The system will wake with a touch event anywhere on the touch surface.

In addition, the MXT288UD-AM and the MXT144UD-AM devices enable detection and tracking of multi-finger thick gloves through a wide variety of overlay materials and thicknesses like leather or wood, or across uneven surfaces – even in the presence of moisture. Normally the dielectric constant of these overlay materials would limit the detection of the touch, however these devices provide a unique solution to reliably detect and track multi-fingers with a high signal-to-noise ratio (SNR) and through a proprietary differential mutual acquisition scheme.

For example, in car sharing applications, this reliable touch functionality helps users access a car from the outside by tracking touch coordinates on an exterior display in any environment, for example rain, snow or extreme heat. Motorcycles and other motorbike vehicles also benefit from such weatherproof designs.

As a turnkey solution, the MXT288UD family provides proven firmware developed according to automotive SPICE processes, and is AEC-Q100 qualified – making it easy for today’s automotive manufacturers to integrate into existing systems at a lower risk with faster time to market.

Development tools and design services

Both software and hardware support are available. Software tools include maXTouch Studio and a maXTouch analyser. For the MXT288UD, the hardware offered includes an evaluation kit with a printed circuit board (PCB) and a 5-inch capacitive touch panel, while the MXT144UD’s evaluation kit includes a PCB and a 2,9-inch capacitive touch pad. For both devices, a bridge PCB is included with a USB connection for interfacing to a computer when running maXTouch Studio.


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