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Texas Instruments OPT4041 Digital-Ambient Light Sensor

Texas Instruments OPT4041 High-Precision Digital-Ambient Light Sensor measures the intensity of visible light in two independent channels. The ALS channel's spectral response tightly matches the human eye's photopic response, whereas the WB channel's spectral response is wide and measures a broad spectrum of light. A specially engineered filter on the ALS channel rejects near-infrared components from common light sources to measure accurate light intensity. The output of the Texas Instruments OPT4041 is semi-logarithmic with binary logarithmic full-scale light ranges and 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 optimum possible resolution in all conditions without user input.

Features

  • High precision, high-speed light-to-digital conversion over high-speed I2C interface
  • Visible channel
    • Precision optical filtering to closely match the human eye with excellent near-infrared (IR) rejection
    • 28 bits of an effective dynamic range of 585µlux to 157klux
  • Wideband channel
    • Responsive to a wide range of wavelengths, including NIR
    • 26 bits of an effective dynamic range of 192.3pW/cm2 to 12.91mW/cm2
  • Semi-logarithmic output
    • Nine (visible channel) and seven (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 optimum possible resolution at all times
  • 12 configurable conversion times of 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 of 30µA with ultra-low power standby of 2µA
  • Operating temperature range of –40°C to +85°C
  • 1.6V to 3.6V wide power-supply range
  • 5.5V Tolerant I/O pins
  • Selectable I2C address
  • Small-form factor of 2.1mm × 1.9mm × 0.6mm in a SOT-5X3 package

Applications

  • IP network cameras
  • Video doorbell
  • Analog security camera
  • Door and window sensor

Functional Block Diagram

Block Diagram - Texas Instruments OPT4041 Digital-Ambient Light Sensor

Development Tool

Texas Instruments OPT4041DTSEVM Sensor Evaluation Module (EVM)

Module evaluates the OPT4041 dual-channel, high-speed, high-precision digital ambient light sensor.

Learn Moreabout Texas Instruments OPT4041DTSEVM Sensor Evaluation Module (EVM) View Productsrelated to Texas Instruments OPT4041DTSEVM Sensor Evaluation Module (EVM)
Published: 2025-03-28 | Updated: 2025-04-04