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TSL2541 Ambient Light Sensor

Light-to-Digital Converter with I²C interface


  • Dark Mold Compound package
  • Integrated on-chip photopic filter
  • High Sensitivity down to mLux levels
  • 0.18µm process technology with 1.8V I2C
  • 1M:1 dynamic range
  • Automatic AUTO Zero/Dark Count control


  • Enables concealment behind inked glass
  • Provides near photopic responsiveness
  • Design flexibility for dark glass & placement
  • Reduces power consumption
  • Enables dark room to sunlight operation
  • Eliminates system electrical background noise

Product parameters

Supply Voltage [V] 1.7 - 2.0
Interface I²C - 1.8V
Max. Lux 60000
Temperature Range [°C] -30 to 85
Packages QFN, Pin Count 10

General Description

The TSL2541 is a very-high sensitivity light-to-digital converter
that has a dark mold compound package which enables concealment behind inked glass. It approximates the human eye response to light intensity under varying lighting conditions and transforms this light intensity to a digital signal output capable through a 1.8V I²C interface. The ALS sensor features 2 output channels, a visible channel and an IR channel. The visible channel has a photodiode with a photopic Interferometric UV and IR blocking filter and the IR channel has a photodiode with an IR pass filter. Each channel has a dedicated integrating data converter which converts photodiode current into a 16-bit digital output. This digital output can be interfaced with a microprocessor where illuminance in lux is derived to accurately measure ambient light to control a displays backlight.

This product suits for the following applications:

  • Home controller assistants
  • Smartwatch wearables
  • Display backlight controller
  • Tables
  • Smartphones
  • Medical diagnostics


Title Category Headline Buy
TSL2541 EVM Application Board Evaluation Kit for TSL2541

Technical Documents

Type Description Language
Datasheet Document version 1-01 English
Application Note TSL258x: Accurate ADC Readings after Enable (DN42) English
Application Note Colorimetry Tutorial (DN 20) English

Other Information

Type Description Language
Block Diagram TSL2541 Block Diagram English

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