TSL2550T

TSL2550T Datasheet

TSL2550 AMBIENT LIGHT SENSOR WITH SMBus INTERFACE

Part	Datasheet
TSL2550T	TSL2550T (pdf)

Related Parts	Information
TSL2550D-TR	TSL2550D-TR

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TSL2550 AMBIENT LIGHT SENSOR WITH SMBus INTERFACE TAOS029L − OCTOBER 2007 D Converts Light Intensity to Digital Signal D Infrared Compensation to Approximate Human Eye Response D Companding A/D for Wide Dynamic Range D Rejects 50 Hz/60 Hz Lighting Ripple D Two-Wire SMBus Serial Interface D Single Supply Operation V to V D Low Active Power 1 mW typ D Power Down Mode D Low-Profile Surface-Mount Packages D RoHS Compliant The TSL2550 is a digital-output light sensor with a two-wire, SMBus serial interface. It combines two photodiodes and a companding 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 GND 2 4 SMBData 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 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. Functional Block Diagram VDD = V to V Channel 0 Photodiode Channel 1 Photodiode Integrating A/D Converter Control Logic Output Registers Two-Wire Serial Interface SMBCLK SMBData The LUMENOLOGY r Company Texas Advanced Optoelectronic Solutions Inc. 1001 Klein Road S Suite 300 S Plano, TX 75074 S 972r 673-0759 Copyright E 2007, TAOS Inc. 1 TSL2550 AMBIENT LIGHT SENSOR WITH SMBus INTERFACE TAOS029L − OCTOBER 2007 Terminal Functions TERMINAL NAME D PKG T PKG SMBCLK SMBData TYPE Power supply ground. All voltages are referenced to GND. SMBus serial clock input terminal clock signal for SMBus serial data. SMBus serial data I/O terminal serial data I/O for SMBus. Supply voltage. Available Options DEVICE TSL2550 ORDERING NUMBER TSL2550D TSL2550T Absolute Maximum Ratings over operating free-air temperature range unless otherwise noted † Supply voltage, VDD see Note 1 6 V Digital output voltage range, VO V to +6 V Digital output current, IO ± 10 mA SMBus input/output current, I SMBIN −1 mA to 20 mA Operating free-air temperature range, TA −40°C to 85°C Storage temperature range, Tstg −40°C to 85°C ESD tolerance, human body model 2000 V Solder conditions in accordance with JEDEC J−STD−020A, maximum temperature see Note 2 260°C † Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES All voltage values are with respect to GND. Package D only The device may be hand soldered provided that heat is applied only to the solder pad and no contact is made between the tip of the solder iron and the device lead. The maximum time heat should be applied to the device is 5 seconds. Recommended Operating Conditions Supply voltage, VDD Operating free-air temperature, TA SMBus input low voltage VDD = V ± 5%, VIL SMBus input high voltage VDD = V ± 5%, VIH SMBus operating frequency, f SMBCLK MIN MAX UNIT 70 °C 10 100 kHz Copyright E 2007, TAOS Inc. 2 The LUMENOLOGY r Company r TSL2550 AMBIENT LIGHT SENSOR WITH SMBus INTERFACE TAOS029L − OCTOBER 2007 Electrical Characteristics over recommended operating free-air temperature range unless otherwise noted PARAMETER VOL SMBus output low voltage IDD Supply current High level input current Low level input current TEST CONDITIONS IO = 50 uA IO = 4 mA Active, VSMBCLK and VSMDATA = VDD, VDD = V ± 5% Power down, VSMBCLK and VSMDATA = VDD, VDD = V ± 5% VI = VDD VI = 0 MIN TYP MAX UNIT V mA 10 uA 5 uA −5 uA Operating Characteristics, VDD = V, TA = 255C unless otherwise noted see Notes 2, 3, 4 PARAMETER TEST CONDITIONS CHANNEL MIN TYP MAX UNIT Ee = 0 ADC count value, standard mode λp = 640 nm Ee = 72 uW/cm2 639 799 959 counts λp = 940 nm Ee = 140 uW/cm2 511 799 1039 Ee = 0 ADC count value, extended mode λp = 640 nm Ee = 72 uW/cm2 counts

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TSL2550 AMBIENT LIGHT SENSOR WITH SMBus INTERFACE

TAOS029L − OCTOBER 2007

D Converts Light Intensity to Digital Signal

D Infrared Compensation to Approximate

Human Eye Response

D Companding A/D for Wide Dynamic Range

D Rejects 50 Hz/60 Hz Lighting Ripple D Two-Wire SMBus Serial Interface D Single Supply Operation V to V D Low Active Power 1 mW typ D Power Down Mode D Low-Profile Surface-Mount Packages D RoHS Compliant

The TSL2550 is a digital-output light sensor with a two-wire, SMBus serial interface. It combines two photodiodes and a companding 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 GND 2
4 SMBData 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 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.

Functional Block Diagram

VDD = V to V

Channel 0 Photodiode

Channel 1 Photodiode

Integrating A/D Converter

Control Logic

Output Registers

Two-Wire Serial Interface

SMBCLK SMBData

The LUMENOLOGY r Company

Texas Advanced Optoelectronic Solutions Inc.
1001 Klein Road S Suite 300 S Plano, TX 75074 S 972r 673-0759

Copyright E 2007, TAOS Inc. 1

TSL2550 AMBIENT LIGHT SENSOR WITH SMBus INTERFACE

TAOS029L − OCTOBER 2007

Terminal Functions

TERMINAL

NAME

D PKG T PKG

SMBCLK

SMBData

TYPE

Power supply ground. All voltages are referenced to GND. SMBus serial clock input terminal clock signal for SMBus serial data. SMBus serial data I/O terminal serial data I/O for SMBus. Supply voltage.

Available Options

DEVICE TSL2550
ORDERING NUMBER TSL2550D TSL2550T

Absolute Maximum Ratings over operating free-air temperature range unless otherwise noted †

Supply voltage, VDD see Note 1 6 V Digital output voltage range, VO V to +6 V Digital output current, IO ± 10 mA SMBus input/output current, I SMBIN −1 mA to 20 mA Operating free-air temperature range, TA −40°C to 85°C Storage temperature range, Tstg −40°C to 85°C ESD tolerance, human body model 2000 V Solder conditions in accordance with JEDEC J−STD−020A, maximum temperature see Note 2 260°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES All voltage values are with respect to GND. Package D only The device may be hand soldered provided that heat is applied only to the solder pad and no contact is made between the tip of the solder iron and the device lead. The maximum time heat should be applied to the device is 5 seconds.

Recommended Operating Conditions

Supply voltage, VDD Operating free-air temperature, TA SMBus input low voltage VDD = V ± 5%, VIL SMBus input high voltage VDD = V ± 5%, VIH SMBus operating frequency, f SMBCLK

MIN MAX UNIT
70 °C
10 100 kHz

Copyright E 2007, TAOS Inc. 2

The LUMENOLOGY r Company r

TSL2550 AMBIENT LIGHT SENSOR WITH SMBus INTERFACE

TAOS029L − OCTOBER 2007

Electrical Characteristics over recommended operating free-air temperature range unless otherwise noted

PARAMETER VOL SMBus output low voltage

IDD Supply current

High level input current

Low level input current

TEST CONDITIONS

IO = 50 uA IO = 4 mA Active, VSMBCLK and VSMDATA = VDD, VDD = V ± 5%

Power down, VSMBCLK and VSMDATA = VDD, VDD = V ± 5%

VI = VDD VI = 0

MIN TYP MAX UNIT V mA
10 uA 5 uA
−5 uA

Operating Characteristics, VDD = V, TA = 255C unless otherwise noted see Notes 2, 3, 4

PARAMETER

TEST CONDITIONS

CHANNEL MIN TYP MAX UNIT

Ee = 0

ADC count value, standard mode
λp = 640 nm Ee = 72 uW/cm2
639 799 959
counts
λp = 940 nm Ee = 140 uW/cm2
511 799 1039

Ee = 0

ADC count value, extended mode
λp = 640 nm Ee = 72 uW/cm2
counts

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Datasheet ID: TSL2550T 519836