SI1142-A11-GMR

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
• 15cm Proximity range with single pulse (<gt/>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
• Serial communications up to 3.4Mbps data rate