General Description
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.

Features
   Dual Diode
   Programmable Analog Gain and Integration Time
   600M:1 Dynamic Range
      • Two Internal Interrupt Sources
      • Programmable Upper and Lower Thresholds
      • One Interrupt Includes Programmable Persistence Filter
   User Selectable Sleep Mode
      • Data Rates up to 400 kbit/s
      • Input Voltage Levels Compatible with 3.0V Bus

Benefits
   Approximates Human Eye Response
   Flexible Operation
   Suited for Operation Behind Dark Glass
   Low Operating Overhead
   Low Power 3.0 μA Sleep State
   I2C Fast Mode Compatible Interface