Sensor makes gesture recognition for vehicle HMIs affordable

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By Christoph Hammerschmidt

With the MAX25205, automotive system designers can integrate dynamic gesture controls into their systems much more easily than before – at the lowest cost in the industry and with the smallest component footprint. With integrated optics and a 6×10 Infrared (IR) sensor array, the sensor detects wiping and rotating movements of the hand with significantly less complexity than that of time-of-flight (ToF) cameras.

Furthermore, the chip is characterised by a high degree of integration: With its small dimensions of 4 mm x 4 mm, it is up to 75% smaller than camera-based ToF solutions. Gesture recognition offers a popular supplement to voice control, which in practice is not always the most effective control option. Another advantage of gesture control is that the touch screens in the vehicle are not soiled by many fingerprints, which makes the displays more difficult to read.

With its array of 60 photodiodes, LED drivers and internal LDO, the MAX25205 has a total circuit size that is significantly smaller than that of ToF camera solutions. It can also be combined with a small microcontroller instead of the larger microprocessors required for more complex solutions.

The part recognises nine gestures, including wipe, rotate, non-contact link activation and 3×2 proximity zones with low delay time. All these functions are integrated into a single chip – some competing solutions require up to three chips and a complex microprocessor.

More information can be found here.


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