TSL2550 digital light sensor

Datasheet TSL2550 AMBIENT LIGHT SENSOR WITH SMBus INTERFACE
Development Tool TSL2550 EVM User Guide
Application Note Using the TSL2550 with a Microcontroller
Application Note Use of the TSL2550 for In-Vehicle Displays
Application Note TSL2550 Lux Calculation
Application Note Controlling Backlight with the TSL2550
Application Note Safety In-Vehicle Displays by G Lee
Application Note DN 09 Simplified TSL2550 Lux Calculation for Embedded and Micro Controllers
Application Note DN 13 Optical Window Design for TSL2550
Application Note DN 14 TSL2550 Demonstration Application

Converts Light Intensity to Digital Signal with a two wire SMBus Serial Interface or I2C (@100KHz)
Spectral Response approximates Human Eye
Companding A/D for Wide Dynamic Range
Low Active Power (1 mW typical)
Power Down Mode
TMB package (shown)
RoHS Compliant
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The TSL2550 is a digital light sensor with a two-wire, SMBus serial interface. It combines two photodiodes and a companding analog-to-digital converter (ADC) on a single CMOS integrated circuit to provide light measurments over an effective 12-bit dynamic range. The ADC digital outputs of the two channels are used to obtain a value that approximates the human eye response in the commonly used unit of Lux.