Automotive digital ambient light sensor (ALS) with high-precision human-eye response


Product details


Rating Automotive Operating temperature range (C) -40 to 105, -40 to 85 Interface type I2C Input type Light open-in-new Find other Ambient light sensors

Package | Pins | Size

USON (DNP) 6 4 mm² 2 x 2 open-in-new Find other Ambient light sensors


  • AEC-Q100 Qualified for Automotive Devices
    • Device Temperature Grade 2: –40°C to +105°C Ambient Operating Temperature
    • Device Temperature Grade 3: –40°C to +85°C Ambient Operating Temperature
  • Precision Optical Filtering to Match Human Eye:
    • Rejects > 99% (Typical) of IR
  • Automatic Full-Scale Setting Feature Simplifies Software and Ensures Proper Configuration
  • Measurements: 0.01 Lux to 83k Lux
  • 23-Bit Effective Dynamic Range With
    Automatic Gain Ranging
  • 12 Binary-Weighted Full-Scale Range Settings:
    < 0.2% (Typical) Matching Between Ranges
  • Low Operating Current: 1.8 µA (Typical)
  • Operating Temperature Range (Grade 2): –40°C to +105°C
  • Operating Temperature Range (Grade 3): –40°C to +85°C
  • Functional Temperature Range: –40°C to 105°C
  • Wide Power-Supply Range: 1.6 V to 3.6 V
  • 5.5-V Tolerant I/O
  • Flexible Interrupt System
  • Small-Form Factor: 2 mm × 2 mm × 0.65 mm
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The OPT3001-Q1 device is an optical sensor that measures the intensity of visible light. The spectral response of the sensor tightly matches the photopic response of the human eye and includes significant infrared rejection.

The OPT3001-Q1 device is a single-chip lux meter, measuring the intensity of light as visible by the human eye. The precision spectral response and strong IR rejection of the device enables the OPT3001-Q1 device to accurately meter the intensity of light as seen by the human eye, regardless of light source. The strong IR rejection also aids in maintaining high accuracy when industrial design calls for mounting the sensor under dark glass for aesthetics. The OPT3001-Q1 device is designed for systems that create light-based experiences for humans, and an ideal preferred replacement for photodiodes, photoresistors, or other ambient light sensors with less human eye matching and IR rejection.

The digital operation is flexible for system integration. Measurements can be either continuous or single-shot. The control and interrupt system features autonomous operation, allowing the processor to sleep while the sensor searches for appropriate wake-up events to report through the interrupt pin. The digital output is reported over an I2C- and SMBus-compatible, two-wire serial interface.

The low-power consumption and low-power supply voltage capability of the OPT3001-Q1 device enhance the battery life of battery-powered systems.

Measurements can be made from 0.01 lux up to 83k lux, without manually selecting full-scale ranges, by using the built-in, full-scale setting feature. This capability allows light measurement over a 23-bit effective dynamic range.

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Technical documentation

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Type Title Date
* Data sheet OPT3001-Q1 Ambient Light Sensor (ALS) datasheet (Rev. A) Dec. 20, 2018
Application note Buildup Test Platform for Stand-Alone OPT300x Apr. 03, 2020
Application note How to Select an Ambient Light Sensor for Your End Equipment (Rev. B) Nov. 25, 2019
Technical article Understanding tamper detection sensors Nov. 18, 2019
Application note Using Digital Output Ambient Light Sensors for Automotive Displays Jun. 27, 2019
Application note OPT3001/-Q1:Automatic control of Display backlight using an Ambient Light Sensor Aug. 18, 2017
Technical article Collecting environmental data with less energy and wiring May 23, 2017
Technical article How to bring the IoT to older buildings with automation technology Aug. 13, 2015
User guide OPT3001EVM User's Guide (Rev. A) Oct. 14, 2014

Design & development

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Hardware development

document-generic User guide

The OPT3001 is an ambient light sensor (ALS) with a digital output integrated circuit.  It uses a two-wire interface that works with the I2C protocol making it ideal for many applications.  The OPT3001EVM is a platform for evaluating the performance of the OPT3001 under various (...)

  • Small Form Factor
  • USB Hardware Interface
  • Intuitive GUI Software
  • Protective Plastic Case
  • 100mil spaced test points for easy experimentation with external controllers

Reference designs

Automotive HVAC control reference design with HMI
TIDA-020010 — This reference design offers a cost-effective solution for a heating, ventilation, and air conditioning (HVAC) human-machine interface (HMI) application. This reference design incorporates a synchronous step-down converter, multiple channel half-bridge motor driver for brushed DC motors (BDC (...)
document-generic Schematic
Automotive Multi Channel LED Driver Reference Design for HVAC HMI
TIDA-01500 — In HVAC (heating, ventilation, and air conditioning) HMI (human machine interface) the displays and buttons are illuminated with many of LEDs. The drive circuit for these LEDs are traditionally realized in a discreet way so that an MCU drives external low side BJTs that sink current, limited by (...)
document-generic Schematic
Automotive 144-Zone Local Dimming Backlight Reference Design
TIDA-020001 — This local dimming backlight reference design conserves power, extends the life of liquid-crystal displays (LCDs), and enhances automotive display quality through high dynamic range (HDR) or localized dimming technology. Seven multi-channel constant-current LED drivers allow for 144-zone localized (...)
document-generic Schematic
Automotive Auto-Dimming Mirror Reference Design for Electrochromic Mirrors
TIDA-01539 — Modern vehicles utilize auto-dimming mirrors to prevent glare and visibility loss for the driver. This reference design utilizes modern human-eye-response ambient light sensors and a high-current amplifier stage to drive a capacitive electrochromic mirror load.
document-generic Schematic
Optical Sense Backlight Reference Design with Temperature Sensing
TIDA-01008 — This reference design conserves power and extends life of LCD and backlight by adjusting the backlight brightness relative to the ambient light level. The capTIvate touch slider allows the brightness to be finetuned per the user's brightness preference. The sensitive thermal requirements of the LCD (...)
document-generic Schematic

CAD/CAE symbols

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