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.