TSL2550
Description
The TSL2550 is a digital-output light sensor with a two-wire, SMBus serial interface. It bines two photodiodes and a panding analog-todigital converter (ADC) on a single CMOS integrated circuit to provide light measurements over an effective 12-bit dynamic range with a response similar to that of the human eye.
VDD 1 NC 2 NC 3 GND 4
PACKAGE D 8-LEAD SOIC (TOP VIEW)
8 SMBData 7 NC 6 NC 5 SMBCLK
PACKAGE T 4-LEAD SMD (TOP VIEW)
VDD 1
4 SMBData
GND 2
3 SMBCLK
The TSL2550 is designed for use with broad wavelength light sources. One of the photodiodes (channel 0) is sensitive to visible and infrared light, while the second photodiode (channel 1) is sensitive primarily to infrared light. An integrating ADC converts the photodiode currents to channel 0 and channel 1 digital outputs. Channel 1 digital output is used to pensate for the effect of the infrared ponent of ambient light on channel 0 digital output. The ADC digital outputs of the two channels are used to obtain a...
