SCL

SDA

ADDR

VDD

OPT3006

INT

Ambient

Light

VDD

ADC

GND

I

Interface

Optical

Filter

10

OPT3006

SBOS698 – OCTOBER 2016

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Copyright © 2016, Texas Instruments Incorporated

7 Detailed Description

7.1 Overview

The OPT3006 measures the ambient light that illuminates the device. This device measures light with a spectral

response very closely matched to the human eye, and with very good infrared rejection.

Matching the sensor spectral response to that of the human eye response is vital because ambient light sensors

are used to measure and help create ideal human lighting experiences. Strong rejection of infrared light, which a

human does not see, is a crucial component of this matching. This matching makes the OPT3006 especially

good for operation underneath windows that are visibly dark, but infrared transmissive.

bus. The result can also be used to alert a system and interrupt a processor with the INT pin. The result can also

be summarized with a programmable window comparison and communicated with the INT pin.

The OPT3006 can be configured into an automatic full-scale, range-setting mode that always selects the optimal

full-scale range setting for the lighting conditions. This mode frees the user from having to program their software

for potential iterative cycles of measurement and readjustment of the full-scale range until optimal for any given

measurement. The device can be commanded to operate continuously or in single-shot measurement modes.

The device integrates its result over either 100 ms or 800 ms, so the effects of 50-Hz and 60-Hz noise sources

from typical light bulbs are nominally reduced to a minimum.

The device starts up in a low-power shutdown state, such that the OPT3006 only consumes active-operation

power after being programmed into an active state.

The OPT3006 optical filtering system is not excessively sensitive to non-ideal particles and micro-shadows on

the optical surface. This reduced sensitivity is a result of the relatively minor device dependency on uniform-

density optical illumination of the sensor area for infrared rejection. Proper optical surface cleanliness is always

recommended for best results on all optical devices.

7.2 Functional Block Diagram