ams AG - global leader in the design and manufacture of high performance analog ICs (integrated circuits)

TSL25911 Ambient Light Sensor

Light-to-digital converter with Vdd I²C interface


The TSL2591 is a very-high sensitivity light-to-digital converter that transforms light intensity into a digital signal output capable of direct I²C interface. The device combines one broadband photodiode (visible plus infrared) and one infrared-responding photodiode on a single CMOS integrated circuit. Two integrating ADCs convert the photodiode currents into a digital output that represents the irradiance measured on each channel. This digital output can be input to a microprocessor where illuminance (ambient light level) in lux is derived using an empirical formula to approximate the human eye response. The TSL2591 supports a traditional level style interrupt that remains asserted until the firmware clears it.

Key Features

  • Highest Sensitivity to 188 µLux
  • Patented dual-diode architecture
  • 600M:1 dynamic range
  • Programmable interrupt function
  • UV-rejection package
  • Area efficient 2mm x 2.4mm Dual Flat no-lead (FN) package

Key Benefits

  • Design flexibility for dark glass & placement
  • Enables operation in IR light environments
  • Enables dark room to sunlight operation
  • Reduces micro-processor Interrupt Overhead
  • Improves lux accuracy across various light sources

Product Facts

Supply Voltage [V] 2.7 - 3.6
Interface I²C - Vdd
Programmable Gain, Integration Time, Interrupt
Maximum Lux 88000
Temperature Range [°C] -30 to +70
Packages FN (6-Pin)
Remark Industry leading dynamic range which drives both ultra low light sensitivity and bright sunlight operation

Additional Information

  • Display backlight control
  • Keyboard illumination control
  • Solid-state and general lighting control
  • Printer paper detection