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The technical content of this TAOS datasheet is still valid.
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TSL2772
LIGHT-TO-DIGITAL CONVERTER
with PROXIMITY SENSING
TAOS131 − DECEMBER 2011
Features
D
Ambient Light Sensing and Proximity
Detection in a Single Device
PACKAGE FN
DUAL FLAT NO-LEAD
(TOP VIEW)
D
Ambient Light Sensing (ALS)
− Approximates Human Eye Response
− Programmable Analog Gain and
Integration Time
− 8,000,000:1 Dynamic Range
− Operation to 60,000 lux in Sunlight
− Very High Sensitivity — Ideally Suited for
Operation Behind Dark Glass
− Package UV Rejection Filter
V
DD
1
SCL 2
GND 3
Not Actual Size
6 SDA
5 INT
4 LDR
D
D
D
D
D
Description
The TSL2772 device family provides both ambient light sensing (ALS) and, when coupled with an external IR
LED, proximity detection. The device family is based on the TAOS patented dual-diode technology that enables
accurate ALS results and approximates human eye response to light intensity under a variety of lighting
conditions.
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The TSL2772 ALS includes a reduced-gain mode that extends the operating range to 60k lux in sunlight. The
device package incorporates a UV-rejection filter that enables accurate ALS. The TSL2772 proximity detection
includes improved signal-to-noise performance and selectable gain modes. A proximity offset register allows
compensation for optical system crosstalk between the IR LED and the sensor. To prevent false proximity data
measurement readings, a proximity saturation indicator bit signals that the internal analog circuitry has reached
saturation.
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− Programmable Analog Gain, Integration
Time, and Offset
− Current Sink Driver for External IR LED
− Saturation Indicator
− 16,000:1 Dynamic Range
Maskable ALS and Proximity Interrupt
− Programmable Upper and Lower
Thresholds with Persistence Filter
Power Management
− Low Power 2.2
mA
Sleep State with User-
Selectable Sleep-After-Interrupt Mode
− 90
mA
Wait State with Programmable Wait
Time from 2.7 ms to > 8 seconds
I
2
C Fast Mode Compatible Interface
− Data Rates up to 400 kbit/s
− Input Voltage Levels Compatible with V
DD
or 1.8-V Bus
Register Set- and Pin-Compatible with the
TSL2x71 Series
Small 2 mm
y
2 mm Dual Flat No-Lead (FN)
Package
End Products and Market Segments
D
Mobile Handsets, Tablets, Laptops, HDTVs,
Monitors, and PMP (Portable Media
Players)
Medical and Industrial Instrumentation
White Goods
Toys
Industrial/Commercial Lighting
Digital Signage
Printers
Texas Advanced Optoelectronic Solutions Inc.
1001 Klein Road
S
Suite 300
S
Plano, TX 75074
S
(972) 673-0759
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www.taosinc.com
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D
Proximity Detection
D
D
D
D
D
D
Display Backlight Control
Cell Phone Touch Screen Disable
Mechanical Switch Replacement
Industrial Process Control
Medical Diagnostics
Printer Paper Alignment
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Applications
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TSL2772
LIGHT-TO-DIGITAL CONVERTER
with PROXIMITY SENSING
TAOS131 − DECEMBER 2011
Functional Block Diagram
Prox LED
Current Driver
Prox Control
Prox
Integration
V
DD
Prox
ADC
Prox
Data
SCL
Interrupt
INT
LDR
Upper Limit
CH0
ADC
CH0
Data
Lower Limit
ALS Control
CH0
CH1
ADC
CH1
CH1
Data
Detailed Description
The TSL2772 light-to-digital device provides on-chip photodiodes, integrating amplifiers, ADCs, accumulators,
clocks, buffers, comparators, a state machine, and an I
2
C interface. Each device combines a Channel 0
photodiode (CH0), which is responsive to both visible and infrared light, and a channel 1 photodiode (CH1),
which is responsive primarily to infrared light. Two integrating ADCs simultaneously convert the amplified
photodiode currents into a digital value providing up to 16 bits of resolution. Upon completion of the conversion
cycle, the conversion result is transferred to the data registers. This digital output can be read by a
microprocessor through which the illuminance (ambient light level) in Lux is derived using an empirical formula
to approximate the human eye response.
Communication to the device is accomplished through a fast (up to 400 kHz), two-wire I
2
C serial bus for easy
connection to a microcontroller or embedded controller. The digital output of the device is inherently more
immune to noise when compared to an analog interface.
The device provides a separate pin for level-style interrupts. When interrupts are enabled and a pre-set value
is exceeded, the interrupt pin is asserted and remains asserted until cleared by the controlling firmware. The
interrupt feature simplifies and improves system efficiency by eliminating the need to poll a sensor for a light
intensity or proximity value. An interrupt is generated when the value of an ALS or proximity conversion exceeds
either an upper or lower threshold. In addition, a programmable interrupt persistence feature allows the user
to determine how many consecutive exceeded thresholds are necessary to trigger an interrupt. Interrupt
thresholds and persistence settings are configured independently for both ALS and proximity.
Proximity detection requires only a single external IR LED. An internal LED driver can be configured to provide
a constant current sink of 15 mA, 30 mA, 60 mA, or 120 mA of current. No external current limiting resistor is
required. The power can also be reduced by a factor of 8 with the PDL bit. The number of proximity LED pulses
can be programmed from 1 to 255 pulses. Each pulse has a 16-μs period. The programmable LED current,
coupled with the programmable number of pulses, provides a 16,000:1 contiguous dynamic range.
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Upper Limit
I
2
C Interface
Wait Control
id
Lower Limit
TSL2772
LIGHT-TO-DIGITAL CONVERTER
with PROXIMITY SENSING
TAOS131 − DECEMBER 2011
Terminal Functions
TERMINAL
NAME
GND
INT
LDR
SCL
SDA
V
DD
NO.
3
5
4
2
6
1
O
O
I
I/O
TYPE
DESCRIPTION
Power supply ground. All voltages are referenced to GND.
Interrupt — open drain (active low).
LED driver for proximity emitter — open drain.
I
2
C serial clock input terminal — clock signal for I
2
C serial data.
Supply voltage.
I
2
C serial data I/O terminal — serial data I/O for I
2
C .
Available Options
DEVICE
TSL27721
TSL27723
TSL27725
†
TSL27727
†
†
ADDRESS
0x39
0x39
0x29
0x29
PACKAGE − LEADS
FN−6
FN−6
FN−6
FN−6
INTERFACE DESCRIPTION
I
2
C Vbus = V
DD
Interface
I
2
C
Vbus = 1.8 V Interface
I
2
C Vbus = V
DD
Interface
Contact TAOS for availability.
Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
DD
(Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.8 V
Input terminal voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 3.8 V
Output terminal voltage (except LDR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 3.8 V
Output terminal voltage (LDR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.8 V
Output terminal current (except LDR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −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
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2
C Vbus = 1.8 V Interface
MIN
NOM
2.4
2.7
3
3
−30
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MAX
3.6
3.6
70
ORDERING NUMBER
TSL27721FN
TSL27723FN
TSL27725FN
TSL27727FN
Supply voltage, V
DD
(TSL27721 & TSL27725) (I
2
C V
bus
= V
DD
)
Supply voltage, V
DD
(TSL27723 & TSL27727) (I
2
C V
bus
= 1.8 V)
Operating free-air temperature, T
A
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UNIT
V
V
°C
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TSL2772
LIGHT-TO-DIGITAL CONVERTER
with PROXIMITY SENSING
TAOS131 − DECEMBER 2011
Operating Characteristics, V
DD
= 3 V, T
A
= 255C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
Active — LDR pulse off
I
DD
Supply current
Wait state
Sleep state — no
3 mA sink current
V
OL
I
LEAK
I
LEAK
V
IH
V
IL
INT,
INT SDA output low voltage
Leakage current, SDA, SCL, INT pins
Leakage current, LDR pin
TSL27721, TSL27725
SCL,
SCL SDA input high voltage
SCL,
SCL SDA input low voltage
TSL27723, TSL27727
TSL27721, TSL27725
TSL27723, TSL27727
6 mA sink current
I
2
C
activity
0
0
−5
−5
0.7 V
DD
1.25
0.3 V
DD
0.54
MIN
TYP
200
90
2.2
4
0.4
0.6
5
5
V
μA
μA
V
V
MAX
250
μA
UNIT
ALS Characteristics, V
DD
= 3 V, T
A
= 255C, AGAIN = 16
y
, AEN = 1 (unless otherwise noted)
(Notes 1 ,2, 3)
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PARAMETER
TEST CONDITIONS
CHANNEL
CH0
CH1
MIN
TYP
E
e
= 0, AGAIN = 120
×
,
ATIME = 0xDB (100 ms)
ATIME = 0xFF
0
0
1
1
2.58
2.73
1
0
0
ATIME = 0xFF
ATIME = 0xC0
White light, E
e
= 263.9
μW/cm
2
,
ATIME = 0xF6 (27 ms) (Note 2)
CH0
CH1
CH0
CH1
4000
4000
5000
680
5000
2850
λ
p
= 850 nm, E
e
= 263.4
μW/cm
2
,
ATIME = 0xF6 (27 ms) (Note 3)
White light, ATIME = 0xF6 (27 ms) (Note 2)
0.086
0.456
0.136
0.570
18.9
2.58
19.0
10.8
0.16
8.0
λ
p
= 850 nm, ATIME = 0xF6 (27 ms) (Note 3)
White light, ATIME = 0xF6 (27 ms)
(Note 2)
CH0
CH1
CH0
CH1
λ
p
= 850 nm, ATIME = 0xF6 (27 ms)
(Note 3)
AGAIN = 1
×
and AGL = 1
AGAIN = 8
×
and AGL = 0
0.128
7.2
AGAIN = 16
×
and AGL = 0
14.4
14 4
16.0
16 0
AGAIN = 120
×
and AGL = 0
108
120
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Dark ADC count value
ADC integration time step size
ADC number of integration steps
(Note 4)
ADC counts per step (Note 4)
ADC count value (Note 4)
ADC count value
ADC count value ratio: CH1/CH0
R
e
Irradiance responsivity
Gain scaling, relative to 1
×
gain
setting
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NOTES: 1. Optical measurements are made using small-angle incident radiation from light-emitting diode optical sources. Visible white LEDs
and infrared 850 nm LEDs are used for final product testing for compatibility with high-volume production.
2. The white LED irradiance is supplied by a white light-emitting diode with a nominal color temperature of 4000 K.
3. The 850 nm irradiance E
e
is supplied by a GaAs light-emitting diode with the following typical characteristics: peak wavelength
λp
= 850 nm and spectral halfwidth
Δλ½
= 42 nm.
4. Parameter ensured by design and is not tested.
Copyright
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2011, TAOS Inc.
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MAX
5
5
counts
ms
steps
counts
counts
UNIT
2.9
256
1024
6000
6000
counts
65535
0.186
0.684
counts/
(μW/
cm
2
)
0.192
8.8
17.6
17 6
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