SI1142-A11-GMR

The Si1141/42/43 is a low-power, reflectance-based, infrared proximity and ambient light sensor with an I2C digital interface and programmable-event interrupt output. This touchless sensor IC includes an analog-to-digital converter, integrated high-sensitivity visible and infrared photodiodes, a digital signal processor, and one, two, or three integrated infrared LED drivers with fifteen selectable drive levels.

The sensor offers excellent performance under a wide dynamic range and a variety of light sources, including direct sunlight. It can also work under dark glass covers. The photodiode response and associated digital conversion circuitry provide excellent immunity to artificial light flicker noise and natural light flutter noise. With two or more LEDs, the Si1142/43 is capable of supporting multiple-axis proximity motion detection.

The Si1141/42/43 devices are provided in a 10-lead 2x2 mm QFN package and are capable of operation from 1.71 to 3.6 V over the –40 to +85 °C temperature range. Key features include adjustable proximity detection from under 1 cm up to 200 cm, 15 current settings for LED drivers, and a dynamic range of 1 to 128 klx for ambient light sensing.

Applications for this sensor include handsets, wearables, audio products, security panels, touchless switches, occupancy sensors, consumer electronics, and industrial automation. Its low power consumption, with an average current of 9 μA and standby current of < 500 nA, makes it suitable for battery-powered devices.