TAOS Inc.
is now
ams AG
The technical content of this TAOS datasheet is still valid.
Contact information:
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8141 Unterpremstaetten, Austria
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TSL2580, TSL2581
LIGHT-TO-DIGITAL CONVERTER
TAOS098 − MARCH 2010
Features
D
Approximately 30
y
More Sensitive Than the
TSL2560/61 Device
PACKAGE CS
6-LEAD CHIPSCALE
(TOP VIEW)
D
Approximates Human Eye Response
D
Programmable ALS Interrupt Function with
D
D
User-Defined Upper and Lower Threshold
Settings
16-Bit Digital Output with SMBus (TSL2580)
at 100 kHz or I
2
C (TSL2581) Fast-Mode at
400 kHz
Programmable Analog Gain and Integration
Time Supporting 1,000,000-to-1 Dynamic
Range
Chipscale Package
V
dd
1
ADDR SEL 2
GND 3
6 SDA
5 INT
4 SCL
Package Drawings are Not to Scale
D
Available in Ultra-Small 1.25 mm
y
1.75 mm
D
Automatically Rejects 50/60-Hz Lighting
D
D
Ripple
Low Quiescent Current 3
mA
in Power
Down Mode
RoHS Compliant
Description
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The TSL2580 and TSL2581 are very-high sensitivity light-to-digital converters that transform light intensity to
a digital signal output capable of direct I
2
C (TSL2581) or SMBus (TSL2580) interface. Each device combines
one broadband photodiode (visible plus infrared) and one infrared-responding photodiode on a single CMOS
integrated circuit capable of providing a near-photopic response over an effective 16-bit dynamic range (16-bit
resolution). Two integrating ADCs convert the photodiode currents to a digital output that represents the
irradiance measured on each channel. This digital output can be input to a microprocessor where illuminance
(ambient light level) in lux is derived using an empirical formula to approximate the human eye response. The
TSL2580 device permits an SMB-Alert style interrupt, and the TSL2581 device supports a traditional level style
interrupt that remains asserted until the firmware clears it.
While useful for general purpose light sensing applications, the TSL2580/81 devices are designed particularly
for display panels (LCD, OLED, etc.) with the purpose of extending battery life and providing optimum viewing
in diverse lighting conditions. Display panel backlighting, which can account for up to 30 to 40 percent of total
platform power, can be automatically managed. Both devices are also ideal for controlling keyboard illumination
based upon ambient lighting conditions. Illuminance information can further be used to manage exposure
control in digital cameras. The TSL2580/81 devices are ideal in notebook/tablet PCs, LCD monitors, flat-panel
televisions, cell phones, and digital cameras. In addition, other applications include street light control, security
lighting, sunlight harvesting, machine vision, and automotive instrumentation clusters.
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V
dd
1
6 SDA
5 INT
ADDR SEL 2
GND 3
4 SCL
PACKAGE FN
DUAL FLAT NO-LEAD
(TOP VIEW)
Applications
D
Ambient Light Sensor (ALS) for Smart
Phones, Digital Photo Frames, and Portable
Navigation Systems
LCD TVs
D
ALS for LED Signs, Laptop Computers, and
Texas Advanced Optoelectronic Solutions Inc.
1001 Klein Road
S
Suite 300
S
Plano, TX 75074
S
(972) 673-0759
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Copyright
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2010, TAOS Inc.
TSL2580, TSL2581
LIGHT-TO-DIGITAL CONVERTER
TAOS098 − MARCH 2010
Functional Block Diagram
Channel 0
Visible and IR
Integrating
A/D Converter
ADDR SEL
Address Select
Command
Register
ADC
Register
Interrupt
Two-Wire Serial Interface
Detailed Description
The TSL2580 and TSL2581 are second-generation ambient light sensor devices. Each contains two integrating
analog-to-digital converters (ADC) that integrate currents from two photodiodes. Integration of both channels
occurs simultaneously. Upon completion of the conversion cycle, the conversion result is transferred to the
Channel 0 and Channel 1 data registers, respectively. The transfers are double-buffered to ensure that the
integrity of the data is maintained. After the transfer, the device automatically begins the next integration cycle.
Communication to the device is accomplished through a standard, two-wire SMBus or I
2
C serial bus.
Consequently, the TSL258x device can be easily connected to a microcontroller or embedded controller. No
external circuitry is required for signal conditioning, thereby saving PCB real estate as well. Since the output
of the TSL258x device is digital, the output is effectively immune to noise when compared to an analog signal.
The TSL258x devices also support an interrupt feature that simplifies and improves system efficiency by
eliminating the need to poll a sensor for a light intensity value. The primary purpose of the interrupt function is
to detect a meaningful change in light intensity. The concept of a
meaningful change
can be defined by the user
both in terms of light intensity and time, or persistence, of that change in intensity. The TSL258x devices have
the ability to define a threshold above and below the current light level. An interrupt is generated when the value
of a conversion exceeds either of these limits.
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INT
SCL
SDA
V
DD
= 2.7 V to 3.6 V
Channel 1
IR Only
TSL2580, TSL2581
LIGHT-TO-DIGITAL CONVERTER
TAOS098 − MARCH 2010
Terminal Functions
TERMINAL
NAME
ADDR SEL
GND
INT
SCL
SDA
V
DD
CS PKG
NO.
2
3
5
4
6
1
FN PKG
NO.
2
3
5
4
6
1
O
I
I/O
TYPE
I
Address select — three-state.
Power supply ground. All voltages are referenced to GND.
Level or SMB Alert interrupt — open drain.
Serial data I/O terminal — serial data I/O.
Supply voltage.
Serial clock input terminal — clock signal.
DESCRIPTION
DEVICE
TSL2580
TSL2580
TSL2581
Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
DD
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.8 V
Digital output voltage range, V
O
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 3.8 V
Digital output current, I
O
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −1 mA to 20 mA
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
Supply voltage, V
DD
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INTERFACE
SMBus
SMBus
I
2
C
PACKAGE − LEADS
Chipscale−6
PACKAGE DESIGNATOR
CS
FN
FN
ORDERING NUMBER
TSL2580CS
TSL2580FN
TSL2581FN
Dual Flat No-Lead−6
Dual Flat No-Lead−6
MIN
NOM
MAX
2.7
3
3.6
−30
70
TSL2580 (Note 2)
TSL2581 (Note 3)
TSL2580 (Note 2)
TSL2581 (Note 3)
2
0.7 V
DD
0.8
0.3 V
DD
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Available Options
Operating free-air temperature, T
A
SCL,
SCL SDA input low voltage, V
IL
voltage
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SCL,
SCL SDA input high voltage, V
IH
voltage
NOTES: 2. Meets SMB specifications.
3. Meets I
2
C specifications where V
DD
= V
BUS
.
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UNIT
V
°C
V
V
Copyright
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2010, TAOS Inc.
3
TSL2580, TSL2581
LIGHT-TO-DIGITAL CONVERTER
TAOS098 − MARCH 2010
Electrical Characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
Active
I
DD
V
OL
I
LEAK
Supply current
INT,
INT SDA output low voltage
Leakage current
Power down
3 mA sink current
6 mA sink current
0
0
−5
TEST CONDITIONS
MIN
TYP
175
3
MAX
250
10
0.4
0.6
5
UNIT
μA
μA
V
V
μA
Operating Characteristics, V
DD
= 3 V, T
A
= 255C, (unless otherwise noted) (Notes 1, 2, 3, and 4)
PARAMETER
f
osc
Oscillator frequency
Dark ADC count value
E
e
= 0, ITIME = 0xB6 (200 ms),
gain = 16
×
ITIME = 0xDB (100 ms)
ITIME = 0x6C (400 ms)
Ch0
Ch1
Ch0
Ch1
Ch0
Ch1
Ch0
Ch1
Ch0
Ch1
TEST CONDITIONS
CHANNEL
MIN
705
0
0
TYP
750
1
1
MAX
UNIT
kHz
795
5
5
Full scale ADC count value
ADC count value
ADC count value ratio: Ch1/Ch0
R
e
Irradiance responsivity
Gain scaling (relative to 1
×)
NOTES: 1. Optical measurements are made using small-angle incident radiation from light-emitting diode optical sources. Visible 640 nm LEDs
and infrared 850 nm LEDs are used for final product testing for compatibility with high-volume production.
2. The 625 nm irradiance E
e
is supplied by an AlInGaP light-emitting diode with the following characteristics: peak wavelength
λp
= 625 nm and spectral halfwidth
Δλ½
= 20 nm.
3. The 850 nm irradiance E
e
is supplied by a light-emitting diode with the following characteristics: peak wavelength
λp
= 850 nm and spectral halfwidth
Δλ½
= 42 nm.
4. The integration time T
int
, is dependent on internal oscillator frequency (f
osc
) and on the number of integration cycles (ITIME) in the
Timing Register (0xFF) as described in the Register section. For nominal f
osc
= 750 kHz, nominal T
int
= 2.7 ms
×
ITIME.
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37887
37887
65535
65535
6000
6000
λ
p
= 625 nm, ITIME = 0xF6 (27 ms)
E
e
= 171.6
μW/cm
2
, gain = 16
×
λ
p
= 850 nm, ITIME = 0xF6 (27 ms)
E
e
= 220
μW/cm
2
, gain = 16
×
λ
p
= 625 nm
λ
p
= 850 nm
4000
4000
5000
700
5000
2750
15.8
15 8
29.1
22.8
12.5
10.8
10 8
20.8
20 8
41
55
4
68
%
λ
p
= 625 nm ITIME = 0xF6 (27 ms)
nm,
λ
p
= 850 nm ITIME = 0xF6 (27 ms)
nm,
8
×
Ch0
Ch1
Ch0
Ch1
Ch0
Ch1
Ch0
Ch1
Ch0
Ch1
7
7
8
8
9
9
16
×
15
15
97
16
16
17
17
111
×
107
115
100
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www.taosinc.com
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counts
counts
counts
counts/
(μW/
cm
2
)
×
115
125
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