Proximity/Ambient Light Sensor IC with I²C Interface

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The Si1151-AB09 is an ambient light sensor, proximity, and gesture detector with I²C digital interface and programmable-event interrupt output.

This touchless sensor IC includes dual 23-bit analog-to-digital converters, an integrated high-sensitivity array of visible and infrared photodiodes, a digital signal processor, and up to three integrated LED drivers with programmable drive levels. The Si1151-AB09 offers excellent performance under a wide dynamic range and a variety of light sources, including direct sunlight. The Si1151-AB09 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 Si1151-AB09 is capable of supporting multiple-axis proximity motion detection. The Si1151-AB09 is provided in a 10-lead 2x2 mm DFN package or in a 10-lead 2.9x4.9 mm LGA module with integrated LED, and is capable of operation from 1.62 to 3.6 V over the –40 to +85 °C temperature range.

Symmetry Electronics is an authorized Silicon Labs distributor.


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Proximity detector:
From under 1 cm, to 50 cm without additional lensing.
From under 1 cm, to 200 cm with additional lensing (e.g., 5 mm hemispherical lens as in our EVB).
Up to three independent LED drivers.
30 current settings from 5.6 mA to 360mA for each LED driver.
Operates in direct sunlight with optional on-die 940 nm passband filter.
On die 940 bandpass filter that reject sun wanted visible light and IR from daylight and other sources (Si115x-AB09/AB9X).
Ambient light sensor:
<100 mlx resolution possible, allowing operation under dark glass.
Up to 128 klx dynamic range possible across two ADC range settings.
Industrys lowest power consumption
1.62 to 3.6 V supply voltage.
9 A average current (LED pulsed 24.4s every 800 ms at 180 mA plus 3 A Si115x supply).
<500 nA standby current.
24.4 s LED on time keeps total power consumption duty cycle low without compromising performance or noise community.
Internal and external wake support.
Built-in voltage supply monitor and power-on reset controller.

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