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TSL2550D-TR

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029L − OCTOBER 2007
1
The LUMENOLOGY r Company
r
r
Copyright E 2007, TAOS Inc.
www.taosinc.com
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 (2.7 V to 5.5 V)
D Low Active Power (1 mW typ)
D Power Down Mode
D Low-Profile Surface-Mount Packages
D RoHS Compliant
Description
The TSL2550 is a digital-output 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 with a
response similar to that of the human eye.
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
SMBCLK
Two-Wire Serial Interface
Integrating
A/D Converter
Control Logic Output Registers
SMBData
V
DD
= 2.7 V to 5.5 V
Channel 0
Photodiode
Channel 1
Photodiode
r
r
Texas Advanced Optoelectronic Solutions Inc.
1001 Klein Road S Suite 300 S Plano, TX 75074 S (972) 673-0759
8 SMBData
7 NC
6 NC
5 SMBCLK
PACKAGE D
8-LEAD SOIC
(TOP VIEW)
V
DD
1
NC 2
NC 3
GND 4
PACKAGE T
4-LEAD SMD
(TOP VIEW)
V
DD
1
GND 2
4 SMBData
3 SMBCLK
TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029L − OCTOBER 2007
2
r
r
Copyright E 2007, TAOS Inc.
The LUMENOLOGY r Company
www.taosinc.com
Terminal Functions
TERMINAL
NAME
D PKG
NO.
T PKG
NO.
TYPE DESCRIPTION
GND 4 2 Power supply ground. All voltages are referenced to GND.
SMBCLK 5 3 I SMBus serial clock input terminal — clock signal for SMBus serial data.
SMBData 8 4 I/O SMBus serial data I/O terminal — serial data I/O for SMBus.
V
DD
1 1 Supply voltage.
Available Options
DEVICE T
A
PACKAGE − LEADS PACKAGE DESIGNATOR ORDERING NUMBER
TSL2550 −40°C to 85° SOIC−8 D TSL2550D
TSL2550 −40°C to 85° T−4 T TSL2550T
Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
DD
(see Note 1) 6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital output voltage range, V
O
−0.3 V to +6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital output current, I
O
±10 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SMBus input/output current, I
(SMBIN)
−1 mA to 20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
−40°C to 85°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
−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: 1. All voltage values are with respect to GND.
2. 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
MIN MAX UNIT
Supply voltage, V
DD
2.7 5.5 V
Operating free-air temperature, T
A
0 70 °C
SMBus input low voltage @ V
DD
= 3.3 V ± 5%, V
IL
0.8 V
SMBus input high voltage @ V
DD
= 3.3 V ± 5%, V
IH
2.1 V
SMBus operating frequency, f
(SMBCLK)
10 100 kHz
TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029L − OCTOBER 2007
3
The LUMENOLOGY r Company
r
r
Copyright E 2007, TAOS Inc.
www.taosinc.com
Electrical Characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
SMBus output low voltage
I
O
= 50 μA 0.01
V
V
OL
SMBus output low voltage
I
O
= 4 mA 0.4
V
I
Supply current
Active, VSMBCLK and VSMDATA = V
DD,
V
DD
= 3.3 V ± 5%
0.35 0.6 mA
I
DD
Supply current
Power down, VSMBCLK and VSMDATA =
V
DD,
V
DD
= 3.3 V ± 5%
10 μA
I
IH
High level input current VI = V
DD
5 μA
I
IL
Low level input current VI = 0 −5 μA
Operating Characteristics, V
DD
= 3.3 V, T
A
= 25C (unless otherwise noted) (see Notes 2, 3, 4)
PARAMETER TEST CONDITIONS CHANNEL MIN TYP MAX UNIT
E 0
Ch0 1
E
e
= 0
Ch1 1
ADC count value standard mode
λ
p
= 640 nm
Ch0 639 799 959
counts
ADC count value, standard mode
λ
p
= 640 nm
E
e
= 72 μW/cm
2
Ch1 85
counts
λ
p
= 940 nm
Ch0 511 799 1039
λ
p
= 940 nm
E
e
= 140 μW/cm
2
Ch1 703
E 0
Ch0 1
E
e
= 0
Ch1 1
ADC count value extended mode
λ
p
= 640 nm
Ch0 155
counts
ADC count value, extended mode
λ
p
= 640 nm
E
e
= 72 μW/cm
2
Ch1 16
counts
λ
p
= 940 nm
Ch0 155
λ
p
= 940 nm
E
e
= 140 μW/cm
2
Ch1 139
ADC count value ratio: Ch1/Ch0,
λ
p
= 640 nm, E
e
= 72 μW/cm
2
0.070 0.106 0.175
ADC count value ratio: Ch1/Ch0
,
standard mode
λ
p
= 940 nm, E
e
= 140 μW/cm
2
0.70 0.88 1.20
λ
p
= 640 nm
Ch0 11.1
R
Irradiance responsivity standard mode
λ
p
= 640 nm
E
e
= 72 μW/cm
2
Ch1 1.2
counts/
(μW/
R
e
Irradiance responsivity, standard mode
λ
p
= 940 nm
Ch0 5.7
(μW/
c
m
2
)
λ
p
= 940 nm
E
e
= 140 μW/cm
2
Ch1 5
cm
2
)
Fluorescent light source: 300 Lux
Ch0 2.8
R
Illuminance responsivity standard mode
Fluorescent light source: 300 Lux
Ch1 0.23
counts/
R
v
Illuminance responsivity, standard mode
Incandescent light source: 50 Lux
Ch0 19
counts/
lux
Incandescent light source: 50 Lux
Ch1 13
(Sensor Lux) / (actual Lux), standard mode
Fluorescent light source: 300 Lux 0.65 1 1.35
(Sensor Lux) / (actual Lux)
,
standard mode
(Note 5)
Incandescent light source: 50 Lux 0.5 1 1.5
NOTES: 3. Optical measurements are made using small-angle incident radiation from light-emitting diode optical sources. Visible 640 nm LEDs
and infrared 940 nm LEDs are used for final product testing for compatibility with high volume production.
4. The 640 nm irradiance E
e
is supplied by an AlInGaP light-emitting diode with the following characteristics: peak wavelength
λp = 640 nm and spectral halfwidth Δλ½ = 17 nm.
5. The 940 nm irradiance E
e
is supplied by a GaAs light-emitting diode with the following characteristics: peak wavelength
λp = 940 nm and spectral halfwidth Δλ½ = 40 nm.
6. The sensor Lux is calculated using the empirical formula shown on p. 11 of this data sheet based on measured Ch0 and Ch1 ADC
count values for the light source specified. Actual Lux is obtained with a commercial luxmeter. The range of the (sensor Lux) / (actual
Lux) ratio is estimated based on the variation of the 640 nm and 940 nm optical parameters. Devices are not 100% tested with
fluorescent or incandescent light sources.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

TSL2550D-TR

Mfr. #:
Buy TSL2550D-TR
Manufacturer:
ams
Description:
Ambient Light Sensors Ambient Light Sensor 1mW 2-Wire SMBus
Lifecycle:
New from this manufacturer.
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