The MLX75031 Optical Gesture & Proximity Sensing IC independently controls up to 2 Active Light channels. Both channels have externally connected photodiodes. The external LEDs can be driven up to 150 mA by the built-in LED driver. The MLX75031 actively controls up to two independent Active Light measurement channels. Each channel works with one or multiple LEDs, of any type, combined with one or more photodiodes, of any type. Additional Active Light channels can be added through multiplexing. Integrated DC light suppression makes the sensors highly tolerant to background light interference. This primary function is complemented with two integrated ambient light channels. Internal control logic, configurable user registers and SPI communication enable intuitive and programmable operation.
Extra features include a watchdog timer, on-board temperature sensor and self-diagnostics are built-in to facilitate robust product design. The digital output from the Active Light and ambient light channels can be used for proximity and ambient light detection. Gestures such as swipe, zoom, scroll can be recognized by software algorithms that can run on the customer’s microcontroller. Reliable communication is assured via an SPI interface.
The Melexis MLX75031 offers great flexibility in the placement and selection of external components. Each customer can optimize their design with their own selection of LED and photodiode, hereby allowing specific sensing range and/or viewing angle, while maintaining superior background light robustness. Optical proximity and gesture detection enables a more intuitive human–machine interaction (HMI) experience.