TAOS TSL2550D

Reference Designs (4)

Attributes

Part Number
Manufacturer
Datasheet
Prefix
U
Digikey Description
Digikey Part Number
Imported From Octopart
yes
Lead Free
yes
Mouser Part Number
Octopart Part Number
eade23afcf493519
Package
SOIC-8
RoHS
yes
Temperature Range High
Temperature Range Low
Min Supply Voltage Dc
2.7 V
Output Current
10 mA
Rise Time
1 us
Supply Current
350 uA

Pins

1
VDD
2
NC
3
NC
4
GND
5
SMBCLK
6
NC
7
NC
8
SMBDATA

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Supplier Part Number # In Stock 15102550100  
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Contributors

Datasheet Preview

TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029A − DECEMBER 2003
1
The
LUMENOLOGY
Company
Copyright 2004, TAOS Inc.
www.taosinc.com
Converts Light Intensity to Digital Signal
Infrared Compensation to Approximate
Human Eye Response
Companding A/D for Wide Dynamic Range
Rejects 50 Hz/60 Hz Lighting Ripple
Two-Wire SMBus Serial Interface
Single Supply Operation (2.7 V to 5.5 V)
Low Active Power (1 mW typ)
Power Down Mode
Low-Profile Surface-Mount Packages
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
Texas Advanced Optoelectronic Solutions Inc.
800 Jupiter Road, Suite 205 Plano, TX 75074 (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
TAOS029A − DECEMBER 2003
2
Copyright 2004, TAOS Inc.
The
LUMENOLOGY
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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.
NOTE 1: All voltages are with respect to GND.
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
TAOS029A − DECEMBER 2003
3
The
LUMENOLOGY
Company
Copyright 2004, 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: 2. 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.
3. 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 ∆λ½ = 17 nm.
4. 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 ∆λ½ = 40 nm.
5. 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.
TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029A − DECEMBER 2003
4
Copyright 2004, TAOS Inc.
The
LUMENOLOGY
Company
www.taosinc.com
AC Electrical Characteristics, V
DD
= 3.3 V, T
A
= 25C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
(CONV)
Conversion time, per channel, standard mode 400 ms
t
(CONV)
Conversion time, per channel, extended mode 80 ms
f
(SMBCLK)
Clock frequency 100 kHz
t
(BUF)
Bus free time between start and stop condition 4.7 µs
t
(HDSTA)
Hold time after (repeated) start condition. After
this period, the first clock is generated.
4 µs
t
(SUSTA)
Repeated start condition setup time 4.7 µs
t
(SUSTO)
Stop condition setup time 4 µs
t
(HDDAT)
Data hold time 300 ns
t
(SUDAT)
Data setup time 250 ns
t
(LOW)
SMBCLK clock low period 4.7 µs
t
(HIGH)
SMBCLK clock high period 4 µs
t
(TIMEOUT)
Detect clock/data low timeout 25 35 ms
t
F
Clock/data fall time 300 ns
t
R
Clock/data rise time 1000 ns
C
i
Input pin capacitance 10 pF