SI1143 - Silicon Laboratories

SI1143 PROXIMITY/AMBIENT LIGHT SENSOR IC

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

Features

Pin Assignments
 QuickSense™ integrated infrared proximity detector
Proximity detection adjustable from under 1 cm to over 1 m
Three independent LED drivers
15 current settings from 5.6 mA to 360 mA for each LED driver
25.6 µs LED driver pulse width

500 mm proximity range with single pulse (<2.5 klx)
150 mm proximity range with single pulse (>2.5 klx)
Operates at up to 128 klx (direct sunlight)
Minimum reflectance sensitivity < 1 µW/cm2
High EMI immunity without shielded
 packaging
 QuickSense™ integrated ambient light sensor
10 mlx resolution possible, allowing

 o.