Maxim improves infra-red gesture chip.


The result is the MAX25405 and, like its predecessor, it is intended to displace camera-based time-of-flight systems in automotive, industrial and consumer gesture recognition.

“MAX25405 senses a wider proximity of movement and doubles the sensing range from 20cm to 40cm when compared to earlier infra-red generations,” according to the company (see table below).

max25405 gesture block Like the earlier MAX25205, this chip includes a 6 x 10 array of infra-red photodiodes for reception, addressable from a host microcontroller over SPI or I2C.

Via external transistors it can also switch the necessary external infra-red LEDs – duty cycle is programmable from 1/16 to 16/16.

Gesture recognition is off-chip, by an algorithm in the host MCU (Cortex M0 in a MAX32630 is suggested), where nine gestures can be picked-out including swipe, rotation, air-click, linger-to-click and six proximity zones.

MAX25205 MAX25405
left-right gesture 20cm 40cm
up-down gesture 20cm 40cm
rotation gesture 15cm 30cm
Proximity 3×2 zones 3×2 zones
field of view >±20° >±30°

Applications are foreseen in automotive, industrial and consumer products – touch-free smart hubs and thermostats are examples of the latter.

“Gesture sensing adds value to low- and mid-range cars, while offering passengers the luxury of touch-free gesture control,” Maxim business unit director Szu-Kang Hsien.

Packaging is 4 x 4 x 1.35mm 20pin QFN package, and there is an evaluation kit: MAX25405EVKIT#.

The MAX25405 product page is here

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