1 Features

• High precision, high speed light-to-digital

conversion over high speed I2C interface

• Visible channel:

– Precision optical filtering to closely match

human eye with excellent near infrared (IR)

rejection

– 28 bits of effective dynamic range: 585μlux to

157klux

• Wide band channel:

– Responsive to a wide range of wavelengths,

including NIR

– 26 bits of effective dynamic range:

192.3pW/cm2 to 12.91mW/cm2

• Semi-logarithmic output:

– 9 (visible channel) and 7 (WB channel) binary

logarithmic full-scale light ranges

– Highly linear response within each range

• Built-in automatic full-scale light range selection

logic that switches measurement range based on

input light condition for best possible resolution at

all times

• 12 configurable conversion times:

– 600μs to 800ms per channel for high-speed

and high-precision applications

• External pin interrupt for hardware synchronized

trigger and interrupts

• Internal FIFO on output registers with I2C burst

readout

• Low operating current: 30μA

with ultra-low power standby: 2μA

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

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

• 5.5V Tolerant I/O pins

• Selectable I2C address

• Small-form factor:

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

2 Applications

• IP Network Cameras

• Video doorbell

• Analog Security Camera

• Door & Window Sensor

3 Description

The OPT4041 is a light-to-digital sensor (single chip lux meter) that measures the intensity of visible light in two

independent channels. The spectral response of the ALS channel tightly matches the photopic response of the

human eye, where as the spectral response of the WB channel is wide and measures a broad spectrum of light.

A specially engineered filter on the ALS channel rejects near-infrared component from common light sources to

measure accurate light intensity. The output of the OPT4041 is semi-logarithmic with binary logarithmic full-scale

light ranges along with a highly linear response within each range. The visible channel provides nine binary

light ranges, providing measurement capability from 585μlux to 157klux and 28 bits of effective dynamic range.

The wide band channel provides seven light ranges, providing measurement capability from 192.3pW/cm2 to

12.91mW/cm2 and 26 bits of effective dynamic range. The built-in automatic range selection logic dynamically

adjusts the device gain settings based on the light level, providing the best possible resolution in all conditions

without user input.

The OPT4041 is equipped with engineered optical filters on both channels, providing strong out-of-band

rejection. Strong infrared rejection on the visible channel aids in maintaining high lux accuracy across all light

sources, especially when the sensor is placed under dark glass for aesthetic reasons. The WB channel provides

a wide spectrum response helping measure a wide range of spectral content including NIR wavelengths 850nm

and 940nm.

The OPT4041 is designed for systems that require light level detection to enhance user experience and typically

replaces low-accuracy photodiodes, photoresistors, and other ambient light sensors with underwhelming human

eye matching and near-infrared rejection.

The OPT4041 device can be configured to operate with light conversion times from 600μs to 800ms per channel

in 12 steps, providing system flexibility based on application need. Conversion time includes the light integration

time and analog-to-digital (ADC) conversion time. Measurement resolution is determined by a combination of

light intensity and integration time, effectively providing the capability to measure down to 585μlux of light

intensity changes.

Digital operation is flexible for system integration. Measurements can be either continuous or triggered in one

shot with register writes or a hardware pin. The device features a threshold detection logic, which allows the

processor to sleep while the sensor waits for an appropriate wake-up event to report through the interrupt pin.

The sensor reports a digital output representing the light level over an I2C- and SMBus-compatible, two-wire

serial interface. An internal first-in-first-out (FIFO) on the output registers is available to read out measurements

from the sensor at a slower pace while still preserving all data captured by the device. The OPT4041 also

supports I2C burst mode, thus helping the host read data from the FIFO with minimal I2C overhead.

The low power consumption and low power-supply voltage capability of the OPT4041 helps enhance the battery

life of battery-powered systems.