The SI1142-A11-GMR is a reflectance-based, Infrared Proximity and Ambient Light Sensor with I²C digital interface and programmable-event interrupt output. This touchless sensor IC includes an analogue-to-digital converter, integrated high-sensitivity visible and infrared photodiodes, digital signal processor and one, two or three integrated infrared LED drivers with fifteen selectable drive levels. The device offers excellent performance under a wide dynamic range and a variety of light sources including direct sunlight. The device 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 device is capable of supporting multiple-axis proximity motion detection.
Proximity detection adjustable from under 1cm up to 200cm
Three independent LED drivers
15 Current settings from 5.6 to 360mA for each LED driver
25.6µs LED driver pulse width
50cm Proximity range with single pulse (<3 klx)
15cm Proximity range with single pulse (>3 klx)
Operates at up to 128klx (direct sunlight)
<1µW/cm² High reflectance sensitivity
High EMI immunity without shielded packaging
Accurate lux measurements with IR correction algorithm
9µA Average current
<500nA Standby current
Internal and external wake support
Built-in voltage supply monitor and power-ON reset controller
