Proximity/UV/Ambient Light Sensor IC With I²C Interface

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The Si1146 is a low-power, reflectance-based, infrared proximity, ultraviolet (UV) index, and ambient light sensor with 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, digital signal processor, and one, two, or three integrated infrared LED drivers with fifteen selectable drive levels. The Si1146 offers excellent performance under a wide dynamic range and a variety of light sources including direct sunlight. The Si1146 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 Si1146 is capable of supporting multiple-axis proximity motion detection. The Si1146 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.

Symmetry Electronics is an authorized Silicon Labs distributor.


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Integrated infrared proximity detector
- Proximity detection adjustable from under 1 cm to over 50 cm
- Three independent LED drivers
- 15 current settings from 5.6 mA to 360 mA for each LED driver
- 25.6 s LED driver pulse width
- 50 cm proximity range with single pulse (<3 klx)
- 15 cm proximity range with single pulse (>3 klx)
- Operates at up to 128 klx (direct sunlight)
- High reflectance sensitivity < 1 W/cm2
- High EMI immunity without shielded packaging
Integrated ambient light sensor
- 100 mlx resolution possible, allowing operation under dark glass
- 1 to 128 klx dynamic range possible across two ADC range settings
- Accurate lux measurements with IR correction algorithm
Integrated UV index sensor
Industry's lowest power consumption
- 1.71 to 3.6 V supply voltage
- 9 A average current (LED pulsed 25.6 s every 800 ms at 180 mA plus 3 A Si114x supply)
- < 500 nA standby current
- Internal and external wake support
- Built-in voltage supply monitor and power-on reset controller
- 25.6 s LED on time keeps total power consumption duty cycle low without compromising performance or noise immunity
IC Serial communications
- Up to 3.4 Mbps data rate
- Slave mode hardware address decoding
Small-outline 10-lead 2x2 mm QFN
Temperature Range: 40 to +85 C

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