Automotive touch controllers reduce board space by 75%

Automotive touch controllers reduce board space by 75%

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Microchip’s smallest maXTouch touch controllers offer weatherproof operation and glove-touch detection in multi-function displays, touch pads, and smart surfaces in automotive applications

By
Gina Roos, editor-in-chief

Microchip
Technology Inc. has expanded its maXTouch portfolio with the release of
its smallest automotive touch controller aimed at secondary displays with
advanced features. The new MXT288UD
touch controller family
claimed as the industry’s smallest automotive-grade
packaged touch screen controllers can fit secondary touch surfaces that are
found in both the interior of cars and exterior of a motor vehicle, such as
handlebars, doors, electronic mirrors, control knobs, the steering wheel,
between seats, and in an armrest.

The
MXT288UD-AM and the MXT144UD-AM devices, housed in a 7 x 7-mm automotive-grade
VQFN56 package, can reduce board space by 75%, while minimizing the bill of
materials, according to Microchip. The touch controllers feature a low power
wait-for-touch mode that consumes less than 50 µA, while 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 by a touch event anywhere
on the touch surface.

Microchip-MXT288UD-touch-controller-family-700px

In
addition, the devices offer weatherproof operation and glove-touch detection in
multi-function displays, touch pads, and smart surfaces in vehicles,
motorcycles, e-bikes, and car-sharing services. This includes detection and
tracking of multi-finger thick gloves through a variety of overlay materials
and thicknesses, like leather, wood or across uneven surfaces. This includes in
the presence of moisture, including snow, rain, or extreme heat.

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, said Microchip.

The
MXT288UD family provides firmware, developed according to Automotive
SPICE processes, and is AEC-Q100 qualified — making it easy to integrate
into existing systems for a faster time to market. Software tools includes
maXTouch Studio and maXTouch analyzer.

For
the MXT288UD, the hardware includes an evaluation kit with a printed circuit board (PCB) and a 5”
capacitive touch panel, while the MXT144UD’s evaluation kit includes a PCB and a 2.9” 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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