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
VDD = 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)
VDD 1
NC 2
NC 3
GND 4
PACKAGE T
4-LEAD SMD
(TOP VIEW)
VDD 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
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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.
VDD 1 1 Supply voltage.
Available Options
DEVICE TAPACKAGE − 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, VDD (see Note 1) 6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital output voltage range, VO −0.3 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†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, VDD 2.7 5.5 V
Operating free-air temperature, TA0 70 °C
SMBus input low voltage @ VDD = 3.3 V ± 5%, VIL 0.8 V
SMBus input high voltage @ VDD = 3.3 V ± 5%, VIH 2.1 V
SMBus operating frequency, f(SMBCLK) 10 100 kHz
TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029A − DECEMBER 2003
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Copyright 2004, TAOS Inc.
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Electrical Characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
SMBus output low voltage
IO = 50 µA 0.01
V
VOL SMBus output low voltage IO = 4 mA 0.4 V
I
Supply current
Active, VSMBCLK and VSMDATA = VDD,
VDD = 3.3 V ± 5% 0.35 0.6 mA
IDD Supply current Power down, VSMBCLK and VSMDATA =
VDD, VDD = 3.3 V ± 5% 10 µA
IIH High level input current VI = VDD 5µA
IIL Low level input current VI = 0 −5 µA
Operating Characteristics, VDD = 3.3 V, TA = 25C (unless otherwise noted) (see Notes 2, 3, 4)
PARAMETER TEST CONDITIONS CHANNEL MIN TYP MAX UNIT
E 0
Ch0 1
Ee = 0 Ch1 1
ADC count value standard mode
λp = 640 nm Ch0 639 799 959
counts
ADC count value, standard mode
λp
=
640
nm
Ee = 72 µW/cm2Ch1 85 counts
λp = 940 nm Ch0 511 799 1039
λp
=
940
nm
Ee = 140 µW/cm2Ch1 703
E 0
Ch0 1
Ee = 0 Ch1 1
ADC count value extended mode
λp = 640 nm Ch0 155
counts
ADC count value, extended mode
λp
=
640
nm
Ee = 72 µW/cm2Ch1 16 counts
λp = 940 nm Ch0 155
λp
=
940
nm
Ee = 140 µW/cm2Ch1 139
ADC count value ratio: Ch1/Ch0, λp = 640 nm, Ee = 72 µW/cm20.070 0.106 0.175
ADC
count
value
ratio:
Ch1/Ch0
,
standard mode λp = 940 nm, Ee = 140 µW/cm20.70 0.88 1.20
λp = 640 nm Ch0 11.1
R
Irradiance responsivity standard mode
λp
=
640
nm
Ee = 72 µW/cm2Ch1 1.2 counts/
(µW/
ReIrradiance responsivity, standard mode λp = 940 nm Ch0 5.7 (µW/
c
m2
)
λp
=
940
nm
Ee = 140 µW/cm2Ch1 5
cm2)
Fluorescent light source: 300 Lux
Ch0 2.8
R
Illuminance responsivity standard mode
Fluorescent light source: 300 Lux Ch1 0.23 counts/
RvIlluminance 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 Ee 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 Ee 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
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Company
www.taosinc.com
AC Electrical Characteristics, VDD = 3.3 V, TA = 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. 4µs
t(SUSTA) Repeated start condition setup time 4.7 µs
t(SUSTO) Stop condition setup time 4µs
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 4µs
t(TIMEOUT) Detect clock/data low timeout 25 35 ms
tFClock/data fall time 300 ns
tRClock/data rise time 1000 ns
CiInput pin capacitance 10 pF
TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029A − DECEMBER 2003
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PARAMETER MEASUREMENT INFORMATION
SMBDATA
SMBCLK
StopStart
SMBCLKACK
t(LOWMEXT) t(LOWMEXT)
t(LOWSEXT) SMBCLKACK t(LOWMEXT)
Start
Condition
Stop
Condition
P
SMBDATA
t(SUSTO)
t(SUDAT)
t(HDDAT)
t(BUF)
VIH
VIL
SMBCLK
t(SUSTA)
t(HIGH)
t(F)
t(R)
t(HDSTA)
t(LOW)
VIH
VIL
PSS
Figure 1. SMBus Timing Diagrams
A0A1A2A3A4A5A6
SMBCLK
Start by
Master
SMBDATA
1919
D1D2D3D4D5D6D7 D0R/W
Frame 1 SMBus Slave Address Byte Frame 2 Command Byte
ACK by
TSL2550 Stop by
Master
ACK by
TSL2550
Figure 2. SMBus Timing Diagram for Send Byte Format
A0A1A2A3A4A5A6
SMBCLK
Start by
Master
SMBDATA
1919
D1D2D3D4D5D6D7 D0R/W
Frame 1 SMBus Slave Address Byte Frame 2 Data Byte From TSL2550
ACK by
TSL2550 Stop by
Master
NACK by
Master
Figure 3. SMBus Timing Diagram for Receive Byte Format
TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029A − DECEMBER 2003
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TYPICAL CHARACTERISTICS
SPECTRAL RESPONSIVITY
λ − Wavelength − nm
Figure 4
0400
0.2
0.4
0.6
0.8
1
500 600 700 800 900 1000 1100
Relative Responsivity
Channel 1
Photodiode
Channel 0
Photodiode
Figure 5
NORMALIZED ADC OUTPUT
vs.
SUPPLY VOLTAGE
VDD − Supply Voltage − V
Normalized ADC Output
2.5 3 3.5 4 4.5 5 5.5 6
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029A − DECEMBER 2003
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PRINCIPLES OF OPERATION
Analog-to-Digital Converter
The TSL2550 contains an integrating analog-to-digital converter (ADC) that integrates a photodiode current.
First it integrates channel 0 photodiode current and then it integrates channel 1 photodiode current. At the end
of the conversion cycle for each channel, the conversion result is transferred to the appropriate channel 0 or
channel 1 ADC register. The transfer is double-buffered to ensure that invalid data is not read during the transfer.
After the data is transferred, the TSL2550 automatically begins the next conversion cycle. A VALID bit is used
to indicate that data has been written to the ADC register after ADC is enabled.
Interface to the ADC and control of other device functions is accomplished using the standard 2-wire System
Management Bus (SMBus) interface. Both versions 1.1 and 2.0 of the SMBus are supported.
The ADC has two operating modes:
standard
and
extended
. In standard mode, the integration time is 400 mS
for each channel or 800 mS for both channel 0 and channel 1. Extended mode shortens the integration time
by a factor of five with a corresponding decrease in responsivity of 5×. The extended range allows the device
to operate at higher light levels, extending the overall dynamic range by a factor of five.
Digital Interface
The TSL2550 contains an 8-bit command register that can be written and read via the SMBus. The command
register controls the overall operation of the device. There are two read-only registers that contain the latest
converted value of each of the two ADC channels. The SMBus slave address is hardwired internally as 0111001
(MSB to LSB, A6 to A0).
Both the
send byte protocol
and the
receive byte protocol
are implemented in the TSL2550. The send byte
protocol allows single bytes of data to be written to the device (see Figure 6). The written byte is called the
COMMAND byte. The receive byte protocol allows single bytes of data to be read from the device (see Figure
7). The receive data can be either the previously written COMMAND byte or the data from one of the ADC
channels. In Figure 6 and Figure 7, the clear area represents data sent by the host and the shaded area
represents data returned by the ambient light sensor or slave device.
WR
7
Data ByteSlave AddressS
1
APA
811 11
S = Start Condition P = Stop Condition Shaded = Slave Transmission
Figure 6. Send Byte Protocol
RD
7
Data ByteSlave AddressS
1
APA
811 11
S = Start Condition P = Stop Condition Shaded = Slave Transmission
Figure 7. Receive Byte Protocol
TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029A − DECEMBER 2003
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Command Register
The command register is used primarily to:
Select which ADC register will be read during a read cycle
Switch the dynamic range of the device between standard and extended range modes
Power the device up for operation or power it down for minimum power consumption
Table 1 shows the six primary commands used to control the TSL2550.
Table 1. Command Summary
COMMAND FUNCTION
0x00h Power-down state
0x03h Power-up state/Read command register
0x1Dh Write command to assert extended range mode
0x18h Write command to reset or return to standard range mode
0x43h Read ADC channel 0
0x83h Read ADC channel 1
The content of the command register defaults to 0x00h when power is applied to the device, placing the device
into the power-down mode.
Once the TSL2550 is set to the standard range mode (0x18h) or the extended range mode (0x1Dh), the device
remains in that mode until it is powered down or the mode is changed via the command register.
The 0x03h command has two purposes: It is used to power up the device and can also be used to check that
the device is communicating properly. The value returned during a read cycle should be 0x03h.
ADC Register
The TSL2550 contains two ADC registers (channel 0 and channel 1). Each ADC register contains two
component fields that are used to determine the logarithmic ADC count value: CHORD bits and STEP bits. The
CHORD bits correspond to the most significant portion of the ADC value and specifies a segment of the
piece-wise linear approximation. The STEP bits correspond to the least significant portion of the ADC count
value and specifies a linear value within a segment. CHORD and STEP bits all equal to 0 corresponds to a
condition in which the light level is below the detection limit of the sensor. CHORD and STEP bits all equal to
1 corresponds to an overflow condition.
Each of the two ADC value registers contain seven data bits and a valid bit as described in Table 2.
Table 2. ADC Register Data Format
VALID CHORD BITS STEP BITS
B7 B6 B5 B4 B3 B2 B1 B0
VALID C2 C1 C0 S3 S2 S1 S0
FIELD BITS DESCRIPTION
VALID 7ADC channel data is valid. One indicates that the ADC has written data into the
channel data register, since ADCEN was asserted in the COMMAND register.
CHORD 6 to 4 CHORD number.
STEP 3 to 0 STEP number.
TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
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The specific ADC value register read depends on the last read command written to the command register, as
described above and in the
Operation
section, below.
The MSB of the ADC register (VALID bit B7) is used to indicate that data has been written to the ADC register
after the device is powered up as described in
Command Register
section.
Bits 6 through 0 contain the 7-bit code representing the ADC count value, which is proportional to a
photodetector current. In this code, the ADC count value is represented by a piece-wise linear approximation
to a log function. The transfer function is broken into 8 chords of 16 steps each. (This code is very similar to µ-law
code used in audio compression — it differs in that it does not have a sign bit and it is not inverted.) Table 3 shows
the relationship between the CHORD and STEP bits and the CHORD and STEP numbers and values. These
are used to calculate the ADC count value.
Table 3. CHORD and STEP Numbers and Values vs Register Bits
CHORD
BITS
B6, B5, B4
C, CHORD
NUMBER CHORD
VALUE
(Note A)
STEP
VALUE
(Note B)
STEP
BITS
B3, B2, B1, B0
S, STEP
NUMBER
000 0 0 1 0000 0
001 1 16 2 0001 1
010 2 49 4 0010 2
011 3 115 8 0011 3
100 4 247 16 0100 4
101 5 511 32 0101 5
110 6 1039 64 0110 6
111 7 2095 128 0111 7
1000 8
1001 9
1010 10
1011 11
1100 12
1101 13
1110 14
1111 15
NOTES: A. CHORD VALUE = INT (16.5 × ((2C) − 1))
B. STEP VALUE = 2C
The ADC count value is obtained by adding the CHORD VALUE and the product of the STEP NUMBER and
STEP VALUE (which depends on CHORD NUMBER).
ADC Count Value ((Chord Value)(Step Value) (Step Number))
The ADC count value can also be expressed as a formula:
ADC Count Value (INT (16.5 ((2C1))) (S (2C))
where: C is the CHORD NUMBER (0 to 7)
S is the STEP NUMBER (0 to 15)
as defined in Table 3.
TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029A − DECEMBER 2003
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Operation
After applying VDD, the device will initially be in the power down state. To operate the device, issue an SMBus
Send Byte protocol with the device address and the appropriate command byte to read ADC channel 0 or ADC
channel 1 (see Table 1). To obtain the conversion result, issue an SMBus Receive Byte protocol with the device
address. The data byte received will correspond to the value in the ADC register (0 or 1) specified by the previous
command. I f a conversion has not been completed since power up (either through VDD or power up command),
the valid bit will be 0, and the data will not be valid. If there is a valid conversion result available, the valid bit
will b e set (1), and the remaining 7 bits will represent valid data from the previously selected ADC register. Data
may be read repeatedly from the currently selected ADC register, and although it will remain valid, the ADC
register will not be updated until a new conversion completes for that channel (800 ms total since there are two
serial 400 ms per channel conversion times in standard mode). Note also that the command register itself may
be read, as a check to be sure that the device is communicating properly.
To power down the device for reduced power consumption, issue an SMBus Send Byte protocol with the device
address followed by 0 as indicated in Table 1.
TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029A − DECEMBER 2003
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APPLICATION INFORMATION
The TSL2550 is intended for use in ambient light detection applications, such as display backlight control, where
adjustments are made to display brightness or contrast based on the brightness of the ambient light, as
perceived b y the human eye. Conventional silicon detectors respond strongly to infrared light, which the human
eye does not see. This can lead to significant error when the infrared content of the ambient light is high, such
as with incandescent lighting, due to the difference between the silicon detector response and the brightness
perceived by the human eye.
This problem is overcome in the TSL2550 through the use of two photodiodes. One of the photodiodes
(channel 0) is sensitive to both visible and infrared light, while the second photodiode (channel 1) is sensitive
primarily t o 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 ef fect of the infrared component of light on the
channel 0 digital output. The ADC digital outputs from the two channels are used in a formula to obtain a value
that approximates the human eye response in the commonly used Illuminance unit of Lux. For standard mode:
Light Level (lux) (Ch0 Counts) (0.46) (e(3.13R))
where: R = (Ch1 Counts) / (Ch0 Counts)
The formula above was obtained by optical testing with fluorescent and incandescent light sources. The light
level calculated from the formula will be slightly higher than the actual light level for sunlight and will be slightly
lower than the actual light level for composite fluorescent and incandescent light sources.
Please see TAOS application notes for additional information, including implementing a display brightness
control system with the TSL2550, and for a simple implementation of the equation shown above suitable for use
in embedded microcontrollers.
Table 4 contains a summary of the typical sensor outputs for several common light sources.
Table 4. Sensor Output Summary (Standard Mode)
LIGHT SOURCE ILLUMINANCE
(LUX) CHANNEL 0
(COUNTS) CHANNEL 1
(COUNTS) RATIO:
CH1/CH0 LUX per CH0
COUNT
Fluorescent 300 831 68 0.082 0.36
Daylight (shade) 100 895 343 0.38 0.11
Incandescent 50 959 671 0.7 0.052
Light from 50 or 60 Hz sources, and especially fluorescent lighting, has a high harmonic content. Since the
TSL2550 integrates the ambient light over an approximately 400 millisecond interval (per channel), this light
ripple is typically reduced to less than ¼ LSB.
Power Supply Decoupling
The power supply lines must be decoupled with a 0.1 µF capacitor placed as close to the device package as
possible. The bypass capacitor should have low effective series resistance (ESR) and effective series
inductance (ESI), such as the common ceramic types, which provide a low impedance path to ground at high
frequencies to handle transient currents caused by internal logic switching.
TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029A − DECEMBER 2003
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APPLICATION INFORMATION
PCB Pad Layout
Suggested PCB pad layout guidelines for the D package and T package are shown in Figure 8 and Figure 9.
2.25
6.90
4.65
1.27
0.50
NOTES: A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
Figure 8. Suggested D Package PCB Layout
1.50
2.90
0.90
1.00
NOTES: A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
Figure 9. Suggested T Package PCB Layout
TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
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MECHANICAL DATA
PACKAGE D PLASTIC SMALL-OUTLINE
PIN 1
6 1.27
0.510
0.330
8
2.8 TYP
CLEAR WINDOW
NOTE B
A
1.75
1.35
0.50
0.25
4.00
3.80
6.20
5.80
450.88 TYP TOP OF
SENSOR DIE
5.00
4.80
5.3
MAX
1.27
0.41 0.25
0.10
0.25
0.19
DETAIL A
NOTES: A. All linear dimensions are in millimeters.
B. The center of the 1234 µm by 282 µm photo-active area is typically located in the center of the package in the long dimension and
269 µm off center in the short dimension.
C. Package is molded with an electrically nonconductive clear plastic compound having an index of refraction of 1.55.
D. This drawing is subject to change without notice.
Figure 10. Package D — Plastic Small Outline IC Packaging Configuration
TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
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MECHANICAL DATA
PACKAGE T Four-Lead Surface Mount Device
TOP VIEW
SIDE VIEW
BOTTOM VIEW
3.80
2.60
A
PIN 1
1.35
3.10 2 7
0.35
1.50
0.55
DETAIL A: TYPICAL PACKAGE TERMINAL
0.78
0.90
1.23
0.67
0.281.46
PHOTODIODE ACTIVE AREA LOCATION
0.50
0.10
0.78
R 0.25
PIN 1
PIN 4
NOTES: A. All linear dimensions are in millimeters.
B. Terminal finish is gold.
C. Dimension tolerance is ± 0.15 mm.
D. This drawing is subject to change without notice.
Figure 11. Package T — Four-Lead Surface Mount Device Packaging Configuration
TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
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MECHANICAL DATA
0.30 0.050 2.10
4 0.100
2 0.100
8 Typ
1.75 0.100
5.50
0.100
AA
B
B
12 0.100
R 0.20 TYP
1.50
1.50
SIDE VIEW
TOP VIEW
END VIEW
3.09 MAX
2.90 0.100 Ao
R 0.20 TYP
1.80 Ko
4.29 MAX
4.10 0.100 Bo
DETAIL B
DETAIL A
R 0.20 TYP
NOTES: A. All linear dimensions are in millimeters.
B. The dimensions on this drawing are for illustrative purposes only. Dimensions of an actual carrier may vary slightly.
C. Symbols on drawing Ao, Bo, and Ko are defined in ANSI EIA Standard 481−B 2001.
D. Each reel is 178 millimeters in diameter and contains 1000 parts.
E. TAOS packaging tape and reel conform to the requirements of EIA Standard 481−B.
F. This drawing is subject to change without notice.
Figure 12. TSL2550T Four Lead Surface Mount Package Carrier Tape
TSL2550
AMBIENT LIGHT SENSOR
WITH SMBus INTERFACE
TAOS029A − DECEMBER 2003
16
Copyright 2004, TAOS Inc. The
LUMENOLOGY
Company
www.taosinc.com
PRODUCTION DATA — information in this document is current at publication date. Products conform to
specifications in accordance with the terms of Texas Advanced Optoelectronic Solutions, Inc. standard
warranty. Production processing does not necessarily include testing of all parameters.
NOTICE
Texas Advanced Optoelectronic Solutions, Inc. (TAOS) reserves the right to make changes to the products contained in this
document to improve performance or for any other purpose, or to discontinue them without notice. Customers are advised
to contact TAOS to obtain the latest product information before placing orders or designing TAOS products into systems.
TAOS assumes no responsibility for the use of any products or circuits described in this document or customer product
design, conveys no license, either expressed or implied, under any patent or other right, and makes no representation that
the circuits are free of patent infringement. TAOS further makes no claim as to the suitability of its products for any particular
purpose, nor does TAOS assume any liability arising out of the use of any product or circuit, and specifically disclaims any
and all liability, including without limitation consequential or incidental damages.
TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS, INC. PRODUCTS ARE NOT DESIGNED OR INTENDED FOR
USE IN CRITICAL APPLICATIONS IN WHICH THE FAILURE OR MALFUNCTION OF THE TAOS PRODUCT MAY
RESULT IN PERSONAL INJUR Y O R D EATH. USE OF TAOS PRODUCTS IN LIFE SUPPORT SYSTEMS IS EXPRESSLY
UNAUTHORIZED AND ANY SUCH USE BY A CUSTOMER IS COMPLETELY AT THE CUSTOMER’S RISK.
LUMENOLOGY, TAOS, the TAOS logo, and Texas Advanced Optoelectronic Solutions are registered trademarks of Texas Advanced
Optoelectronic Solutions Incorporated.
