Texas Instruments OPT3001/OPT3001-Q1 Ambient Light Sensor (ALS)

Texas Instruments OPT3001/OPT3001-Q1 Ambient Light Sensor (ALS) is a 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 is a single-chip lux meter, measuring the intensity of light as visible to the human eye. The precision spectral response and strong IR rejection of the device enable the OPT3001 to accurately meter the intensity of light as seen by the human eye regardless of the light source. The strong IR rejection also aids in maintaining high accuracy when an industrial design calls for mounting the sensor under dark glass for aesthetics.

The /OPT3001-Q1 is designed for systems that create light-based experiences for humans, and an ideally preferred replacement for photodiodes, photoresistors, or other ambient light sensors with less human eye matching and IR rejection. The OPT3001-Q1 devices are AEC-Q100 qualified for automotive applications.


  • Precision optical filtering to match the human eye
    • Rejects > 99% (typ) of IR
  • Automatic full-scale setting feature simplifies software and ensures proper configuration
  • 23-Bit effective dynamic range with automatic gain ranging
  • 12 binary-weighted full-scale range settings
    • < 0.2% (typ) matching between ranges
  • Measurements: 0.01 lux to 83k lux
  • 2.5µA Max quiescent current
  • 1.8µA (typ) Low operating current
  • -40°C to +85°C Operating temperature range
  • 1.6V to 3.6V Wide power-supply range
  • 5.5V tolerant I/O
  • Flexible interrupt system
  • Small-form-factor of 2.0mm × 2.0mm × 0.65mm


  • Display backlight controls
  • Lighting control systems
  • Tablet and notebook computers
  • Thermostats and home automation appliances
  • Point-of-Sale terminals
  • Outdoor traffic and street lights
  • Cameras
  • Monitor light sensitive shipments
    • Certain Produce (i.e. Garlic, Milk)
    • Pharmaceuticals
    • Film

Functional Block Diagram

Block Diagram - Texas Instruments OPT3001/OPT3001-Q1 Ambient Light Sensor (ALS)
Published: 2015-01-06 | Updated: 2022-05-25