r
r
TSL4531
DIGITAL AMBIENT LIGHT SENSOR
TAOS112 − OCTOBER 2011
Features
D
Simple Direct Lux Output
D
Approximates Human Eye Response in
Diverse Lighting Conditions
PACKAGE CL
ChipLED
(TOP VIEW)
V
DD
1
4 SCL
D
Three User-Selectable Integration Times
(400 ms, 200 ms, and 100 ms)
D
Wide Dynamic Range — 3 lux to 220k lux
D
Rejects 50 Hz/60 Hz Lighting Ripple
D
Low Active Current (110
mA
typical) with
D
D
D
2.5-V Supply Voltage with 1.8-V Logic
Interface
GND 2
3 SDA
Package Drawing Not to Scale
Power Down Mode (2.2
mA
typical) Enables
Green
Products
16-bit Digital Output with I
2
C Compatibility
Ultra-Small 2 mm
y
2 mm ChipLED package
Applications
D
Outdoor Lighting Control
− Street Lights
− Security Lights
− Traffic Signals
− Commercial Billboards
Display Backlight Control
− Automotive Instrumentation
− Cell Phones
− Tablets and Notebooks
Solid-State and General Lighting and
Daylight Harvesting
− Commercial Lighting
− Industrial Lighting
D
D
Description
The TSL4531 family of devices provides ambient light sensing (ALS) that approximates human eye response
under a variety of lighting conditions. The devices have three selectable integration times and provide a direct
16-bit lux output via an I
2
C bus interface. The wide dynamic range of the ALS makes it particularly useful in
outdoor applications where it is exposed to direct sunlight. The device is ideal for use in automatic control of
street lights and security, billboard, and automotive lighting. The TSL4531 devices can also be used in solid state
and general lighting for automatic control and daylight harvesting to maximize energy conservation. Other
applications include display backlight control to extend battery life and optimize visibility in cell phones, tablets,
and notebooks.
Functional Block Diagram
V
DD
I
2
C Interface
Lux Calc
SCL
ADC
SDA
Photodiode
Array
The
LUMENOLOGY
r
Company
Texas Advanced Optoelectronic Solutions Inc.
1001 Klein Road
S
Suite 300
S
Plano, TX 75074
S
(972) 673-0759
r
www.taosinc.com
1
r
Copyright
E
2011, TAOS Inc.
TSL4531
DIGITAL AMBIENT LIGHT SENSOR
TAOS112 − OCTOBER 2011
Detailed Description
The device contains a photodiode array, an integrating analog-to-digital converter (ADC), signal processing
circuitry, lux calculation logic, and an I
2
C serial interface on a single CMOS integrated circuit to provide lux data
with a 16-bit output. No external circuitry is required for signal conditioning. The device features power
management modes where the user can select continuous operation, power save mode in which the device
inserts a power saving state between each acquisition, or single-cycle operation in which the device enters a
power-down state after data acquisition. The device has three user-selectable integration times of 100 ms,
200 ms, or 400 ms, allowing the user to adjust the sensitivity of the device.
Terminal Functions
TERMINAL
NAME
GND
SCL
SDA
V
DD
NO.
2
4
3
1
I
I/O
TYPE
DESCRIPTION
Power supply ground. All voltages are referenced to GND.
I
2
C serial clock input terminal.
I
2
C serial data I/O terminal — bidirectional.
Supply voltage.
Available Options
DEVICE
TSL45311
†
TSL45313
†
TSL45315
†
TSL45317
†
ADDRESS
0x39
0x39
0x29
0x29
PACKAGE − LEADS
CL−4
CL−4
CL−4
CL−4
INTERFACE DESCRIPTION
I
2
C Vbus = V
DD
Interface
I
2
C Vbus = 1.8 V Interface
I
2
C
Vbus = V
DD
Interface
I
2
C Vbus = 1.8 V Interface
ORDERING NUMBER
TSL45311CL
TSL45313CL
TSL45315CL
TSL45317CL
Contact TAOS for availability.
Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
DD
(Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5 V
Input terminal voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 4.5 V
Output terminal voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 4.5 V
Output terminal current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −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 voltage values are with respect to GND.
†
Recommended Operating Conditions
MIN
Supply voltage, V
DD
Operating free-air temperature, T
A
2.3
−15
NOM
2.5
MAX
3.3
70
UNIT
V
°C
Copyright
E
2011, TAOS Inc.
r
r
The
LUMENOLOGY
r
Company
2
www.taosinc.com
TSL4531
DIGITAL AMBIENT LIGHT SENSOR
TAOS112 − OCTOBER 2011
Operating Characteristics, V
DD
= 2.5 V, T
A
= 255C (unless otherwise noted)
PARAMETER
I
DD
I
LEAK
V
IH
V
IL
Supply current
Leakage current, SDA and SCL pins
TSL45311, TSL45315
SCL,
SCL SDA input high voltage
SCL,
SCL SDA input low voltage
TSL45313, TSL45317
TSL45311, TSL45315
TSL45313, TSL45317
NOTE 1: The average supply current will be slightly lower when PSAVESKIP = 0.
TEST CONDITIONS
Active (Note 1)
Power down — no I
2
C activity
−5
0.7 V
DD
1.25
0.3 V
DD
0.54
MIN
TYP
110
2.2
MAX
130
4
5
UNIT
μA
μA
V
V
ALS Characteristics, V
DD
= 2.5 V, T
A
= 255C, TCNTRL = 1y (Tint = 400 ms) (unless otherwise noted)
PARAMETER
ADC count value
λ
p
= white LED, CCT = 4000K, E
V
= 1000 lux
ADC count value
ADC count value ratio
Sensor output responsivity
Dynamic range
Temperature coefficient
λ
p
= 880 nm + 940 nm, E
e
= 345
μW/cm
2
(Note 1)
Inc std A/Fluorescent F12 (Notes 2 & 4)
λ
p
= white LED, CCT = 4000K
Incandescent light source: STD A
(Notes 3 & 4)
−15°C to 0°C
0°C to 70°C
TCNTRL = 10
Integration time
TCNTRL = 01
TCNTRL = 00
TCNTRL = 10, PSAVESKIP = 0 (Note 5)
Total cycle time
TCNTRL = 01, PSAVESKIP = 0 (Note 5)
TCNTRL = 00, PSAVESKIP = 0 (Note 5)
NOTES: 1.
2.
3.
4.
5.
80
0.8
3
−0.25
−0.20
96
192
384
110.4
220.8
441.6
100
200
400
115
230
460
1
TEST CONDITIONS
MIN
0
1000
3
120
1.2
220k
0
0
104
208
416
119.6
239.2
478.4
ms
ms
counts
%
count/lux
lux
% /
°C
TYP
MAX
65535
UNIT
counts
Combination of IR LEDs used with peak wavelengths of 880 nm and 940 nm for IR rejection production test.
Incandescent STD A light source at 300 lux. Fluorescent F12 light source at 300 lux.
220,000 lux reading possible with TCNTRL set to 4
×
MULTIPLIER (Tint = 100 ms).
Not tested in production.
When PSAVESKIP = 1, total cycle time equals integration time.
The
LUMENOLOGY
r
Company
r
r
www.taosinc.com
Copyright
E
2011, TAOS Inc.
3
TSL4531
DIGITAL AMBIENT LIGHT SENSOR
TAOS112 − OCTOBER 2011
AC Electrical Characteristics, V
DD
= 2.5 V, T
A
= 255C (unless otherwise noted)
PARAMETER
†
f
(SCL)
t
(BUF)
t
(HDSTA)
t
(SUSTA)
t
(SUSTO)
t
(HDDAT)
t
(SUDAT)
t
(LOW)
t
(HIGH)
t
(TIMEOUT)
t
F
t
R
C
i
†
TEST CONDITIONS
MIN
4.7
4
4.7
4
300
250
4.7
4
25
TYP
MAX
400
UNIT
kHz
μs
μs
μs
μs
ns
ns
μs
μs
Clock frequency
Bus free time between start and stop condition
Hold time after (repeated) start condition. After
this period, the first clock is generated.
Repeated start condition setup time
Stop condition setup time
Data hold time
Data setup time
SCL clock low period
SCL clock high period
Detect clock/data low timeout
Clock/data fall time
Clock/data rise time
Input pin capacitance
35
300
1000
10
ms
ns
ns
pF
Specified by design and characterization — not production tested.
PARAMETER MEASUREMENT INFORMATION
t
(LOW)
t
(R)
t
(F)
SCL
V
IH
V
IL
t
(HDSTA)
t
(HIGH)
t
(SUSTA)
t
(SUDAT)
t
(SUSTO)
t
(BUF)
t
(HDDAT)
V
IH
V
IL
SDA
P
Stop
Condition
S
Start
Condition
S
P
Figure 1. Timing Diagrams
Copyright
E
2011, TAOS Inc.
r
r
The
LUMENOLOGY
r
Company
4
www.taosinc.com
TSL4531
DIGITAL AMBIENT LIGHT SENSOR
TAOS112 − OCTOBER 2011
TYPICAL CHARACTERISTICS
NORMALIZED RESPONSIVITY
vs.
ANGULAR DISPLACEMENT — CL PACKAGE
1.0
Photoptic
NORMALIZED SPECTRAL RESPONSIVITY
100
90
80
Normalized Responsivity
70
60
4531
0.8
Normalized Responsivity
Optical Axis
-Q
−60
0.6
50
40
30
20
10
0
300
0.4
0.2
500
700
900
λ
− Wavelength − nm
1100
0
−90
+Q
90
−30
0
30
60
Q
− Angular Displacement −
°
Figure 2
Figure 3
I
DD
vs.
V
DD
160
150
140
130
I
DD
—
mA
255C
OUTPUT
vs
ILLUMINANCE
1000k
120
705C
−155C
110
100
90
80
2.2
Output — Counts
3.2
3.4
10k
100
1
2.4
2.6
2.8
V
DD
− V
3
1
100
10k
1000k
Illuminance — lux
Figure 4
Figure 5
The
LUMENOLOGY
r
Company
r
r
www.taosinc.com
Copyright
E
2011, TAOS Inc.
5
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