Vision and Imaging Sensors / Detectors
Light Sensor converts light intensity to digital signal.
Share:
Press Release Summary:
Model TSL2550 digital light sensor has 2-wire, SMBus serial interface. It combines 2 photodiodes and companding analog-to-digital converter on single CMOS integrated circuit to provide light measurements over 12-bit dynamic range. Unit features single supply operation of 2.7-5.5 V and 1 mW typical active power. It comes in low-profile, surface-mount package and is intended for applications in which measurement of ambient light is used to control display backlighting.
Original Press Release:
TSL2550 Ambient Light Sensor with SMBus Interface
o Converts Light Intensity to Digital Signal
o Infrared Compensation to Approximate Human Eye Response
o Companding A/D for Wide Dynamic Range
o Rejects 50 Hz/60 Hz Lighting Ripple
o Two-Wire SMBus Serial Interface
o Single Supply Operation (2.7 V to 5.5 V)
o Low Active Power (1 mW typ)
o Power Down Mode
o Low-Profile Surface-Mount Package
Description
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 measurements over an effective 12-bit dynamic range.
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 compensate for the effect of the infrared component of ambient light on Channel 0 digital output. 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.
This device is intended primarily for use in applications in which measurement of ambient light is used to control display backlighting such as laptop computers, PDAs, camcorders, and GPS systems. Other applications include contrast control in LED signs and displays, camera exposure control, lighting controls, etc. The integrating conversion technique used by the TSL2550 effectively eliminates the effect of flicker from AC-powered lamps, increasing the stability of the measurement.
The LUMENOLOGY® Company
Texas Advanced Optoelectronic Solutions Inc.
800 Jupiter Road, Suite 205 Plano, TX 75074 (972) 673-0759
www.taosinc.com
