1 Features

? High precision, high speed light-to-digital

conversion over high speed I2C interface in two

package variants

? Precision optical filtering to closely match human

eye with excellent near infrared (IR) rejection

? Semi-logarithmic output with 9 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

? 28 bits of effective dynamic range from

– 312.5 μlux to 83 klux for PicoStar? package

variant

– 437.5 μlux to 117 klux for SOT-5x3 package

variant

? 12 configurable conversion times from 600 μs to

800 ms is an excellent choice for a wide variety of

high speed and high precision applications

? External pin interrupt for hardware synchronized

trigger and interrupts (only on SOT-5X3 package

variant)

? Internal FIFO for output registers with I2C burst

readout

? Low operating current: 30 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/O pins

? Selectable I2C address

? Small-form factor

– PicoStar? package: 0.84 mm x 1.05 mm x

0.226 mm

– SOT-5X3: 2.1mm x 1.9mm x 0.6mm

2 Applications

? Display backlight controls for

– Smartwatches, wearable electronics, and

health fitness bands

– Tablets and notebooks

– Multi-function printers

– Home automation interfaces

– Thermostats and home automation appliances

? Lighting control systems to detect light level (day

or night)

? Point-of-sale terminals

? Outdoor traffic and street lighting

? IP Network Cameras

? Flicker rate detection of light sources

3 Description

The OPT4001 is a light-to-digital sensor (single chip

lux meter) that measures the intensity of visible

light. The spectral response of the sensor tightly

matches the photopic response of the human eye. A

specially engineered filter on the device rejects nearinfrared

component from the common light sources to

measure accurate light intensity. Output of OPT4001

is semi-logarithmic with 9 binary logarithmic full-scale

light ranges along with highly linear response within

each range, bringing capability to measure from

312.5 μlux to 83 klux for PicoStar? variant and

437.5 μlux to 117 klux for the SOT-5X3 variant.

This capability allows light sensor to have 28-bit

effective dynamic range. With built-in automatic fullscale

range selection, logic users do not have to

select appropriate gain settings based on light levels.