1 Features

• High precision, high speed color light-to-digital

conversion over high speed I2C interface

• Four channel sensing using precision optical

filters:

– XYZ tristimulus channels with close matching to

CIE 1931 spectra with excellent IR rejection

– Clear wide bandwidth channel

• High resolution color measurement in CIE XY, LUV

space, correlated color temperature (CCT) along

with ambient lux measurement

• Semi-logarithmic output with 7 binary logarithmic

full-scale light range and highly linear response

within each range

• Built-in automatic full-scale light range selection

logic, which switches measurement range based

on input light condition with excellent gain

matching between ranges

• 26 bits of effective dynamic range from 2.15 mlux

to 144 klux

• 12 configurable conversion times from 600 μs to

800 ms per channel is an excellent choice for

a wide variety of high speed and high precision

applications

• External pin interrupt for hardware synchronized

trigger and interrupts

• Low operating current: 24 μA with ultra-low power

standby: 2 μA

• Operating temperature range: –40°C to +85°C

• Wide power-supply range: 1.6 V to 3.6 V

• 5.5-V Tolerant I/Os

• Selectable I2C address

• Small-form factor:

– 2.1 mm x 1.9 mm x 0.6 mm SOT-5X3 package

2 Applications

• Display brightness & color adjustments

• Camera image correction

• Auto white balancing

• Building automation & control

• Lighting control systems

• Tablet and notebook computers

3 Description

The OPT4048 is a single-chip high resolution color

sensor, capable of measuring four channels each

with specific engineered spectral responses. Three of

the four channels closely match the CIE tristimulus

spectra with the fourth channel having a wide band

spectral response. With measurements from these

channels, important characteristics of the lighting

environment can be extracted like (i) light intensity

(lux), (ii) color in CIE XY, LUV coordinates and

(iii) Correlated Color Temperature. The OPT4048 is

available in a small SOT-5X3 package.

The OPT4048 has a selectable addressing scheme

to enable up to 4 devices on a shared I2C bus. The

spectral response of the channels have been specially

tuned to closely mimic the CIE tristimulus spectra to

get the most accurate color detection, with strong

rejection for wavelengths away from their respective

peaks, especially the NIR (850 nm & 940 nm) region.

The filters use an advanced filter technology which

provides excellent filter performance even at higher

angles of light incidence. This device, with high

accuracy color sensing capability, enables several

applications requiring precise sensing of ambient light

color and color temperature.