TAOS Inc.
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The technical content of this TAOS datasheet is still valid.
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TMD2772
DIGITAL ALS
and PROXIMITY MODULE
PACKAGE
MODULE−8
(TOP VIEW)
TAOS147E −
DECEMBER
2012
Features
D
Ambient Light Sensing, Proximity
D
Detection, and IR LED in a Single Module
Register Set- and Pin-Compatible with the
TMD2771 Series
− Approximates Human Eye Response
− Programmable Analog Gain and
Integration Time
− 8,000,000:1 Dynamic Range
− Very High Sensitivity — Ideally Suited for
Operation Behind Dark Glass
V
DD
1
SCL 2
GND 3
LEDA 4
8 SDA
7 INT
6 LDR
5 LEDK
D
Ambient Light Sensing (ALS)
Package Drawing is Not to Scale
D
D
D
D
*
New or improved feature
Description
Te
c
The TMD2772 family of devices provides digital ambient light sensing (ALS), a complete proximity detection
system, and digital interface logic in a single 8-pin surface mount module. The devices are register-set and
pin-compatible with the TMD2771 family of devices and include new and improved ALS and proximity detection
features. The ALS enhancements include a reduced-gain mode that extends the operating range in sunlight.
Proximity detection includes improved signal-to-noise performance and more accurate factory calibration. 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.
The TMD2772 ALS is based on the TAOS patented dual-diode technology that enables accurate results and
approximates human eye response to light intensity under a variety of lighting conditions. The proximity
detection system includes an LED driver and an IR LED, which are factory trimmed to eliminate the need for
end-equipment calibration due to component variations.
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Printer Paper Alignment
Reduced Proximity Count Variation
*
Programmable Offset
*
Saturation Indicator
*
Current Sink Driver for IR LED
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
3.94 mm
y
2.36 mm
y
1.35 mm Package
−
−
−
−
−
Display Backlight Control
Cell Phone Touch Screen Disable
Mechanical Switch Replacement
Industrial Process Control
Medical Diagnostics
End Products and Market Segments
D
Mobile Handsets, Tablets, Laptops, HDTVs,
D
D
D
D
D
D
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
r
www.taosinc.com
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Copyright
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2012, TAOS Inc.
D
Proximity Detection
Applications
D
D
D
D
D
D
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id
TMD2772
DIGITAL ALS
and PROXIMITY MODULE
TAOS147E −
DECEMBER
2012
Functional Block Diagram
LDR
V
DD
IR LED Constant
Current Sink
Prox Control
Prox
Integration
LEDA
Prox
ADC
Prox
Data
Lower Limit
Upper Limit
Interrupt
INT
Upper Limit
CH0
ADC
LEDK
ALS Control
Channel 0
Lower Limit
Detailed Description
The 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 one photodiode (CH0),
which is responsive to both visible and infrared light, and a second photodiode (CH1), which is responsive
primarily to infrared light. Two integrating ADCs simultaneously convert the amplified photodiode currents to
a digital value providing up to 16-bits of resolution. Upon completion of the conversion cycle, the conversion
result is transferred to the Ch0 and Ch1 data registers. This digital output can be read by a microprocessor
where the luminance (ambient light level in lux) is derived using an empirical formula to approximate the human
eye response.
A fully integrated proximity detection solution is provided with an 850-nm IR LED, LED driver circuit, and
proximity detection engine. An internal LED driver pin (LDR) is externally connected to the LED cathode (LEDK)
to provide a controlled LED sink current. This is accomplished with a proprietary current calibration technique
that accounts for all variances in silicon, optics, package, and most important, IR LED output power. This
eliminates or greatly reduces the need for factory calibration that is required for most discrete proximity sensor
solutions. The
device
is factory calibrated to achieve a proximity count reading at a specified distance with a
specific number of pulses. In use, the number of proximity LED pulses can be programmed from 1 to 255 pulses,
which allows different proximity distances to be achieved. Each pulse has a 16
μs
period with a 7.2
μs
on time.
Communication with 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 photodiode 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.
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Copyright
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2012, TAOS Inc.
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Channel 1
CH1
ADC
CH1
Data
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SDA
GND
CH0
Data
I
2
C Interface
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Wait Control
SCL
id
TMD2772
DIGITAL ALS
and PROXIMITY MODULE
TAOS147E
−
DECEMBER
2012
Terminal Functions
TERMINAL
NAME
GND
INT
LDR
LEDA
LEDK
SCL
SDA
V
DD
NO.
3
7
6
4
5
2
8
1
I
I/O
O
O
TYPE
DESCRIPTION
Power supply ground. All voltages are referenced to
GND.
Interrupt — open drain (active low).
LED
driver input for proximity
IR LED,
constant current source
LED
driver.
LED
anode.
I
2
C serial clock input terminal — clock signal for I
2
C serial data.
I
2
C serial data I/O terminal — serial data I/O for I
2
C .
Supply voltage.
Available Options
DEVICE
ADDRESS
0x39
0x39
0x29
0x29
PACKAGE
− LEADS
Module−8
Module−8
Module−8
Module−8
TMD27721
TMD27723
I
2
C Vbus = V
DD
Interface
I
2
C
Vbus = V
DD
Interface
TMD27725
†
†
TMD27727
†
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
Digital I/O Voltage (except LDR)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
−0
.5 V to 3.8 V
Max LEDA Voltage (T
A
=0 to 70C, 4.4V otherwise. Note 2)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.8 V
Max LDR Voltage (T
A
=0 to 70C, 4.4V otherwise. Note 3)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.8 V
Output terminal current (except
LDR)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
−1
mA to
20
mA
Storage temperature
range,
T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
−
4
0
°C
to 85°C
ES
D
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.
2. Maximum 4.8V DC over 7 years lifetime.
Maximum 5.0V spikes with up to 250s cumulative duration over 7 years lifetime.
Maximum 5.5V spikes with up to 10s (=1000* 10ms) cumulative duration over 7 years lifetime.
3.
Maximum voltage with LDR = off.
NOTES:
1. All voltages are with respect to
GND.
Recommended Operating Conditions
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I
2
C Vbus = 1.8 V Interface
I
2
C Vbus = 1.8 V Interface
MIN
NOM
2.2
−3
2.5
−30
3
Company
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INTERFACE DESCRIPTION
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MAX
3.6
3
4.8
85
Copyright
ORDERING NUMBER
TMD27721
TMD27723
TMD27725
TMD27727
Te
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Supply
voltage,
V
DD
Supply voltage accuracy, V
DD
total error including transients
Operating free-air
temperature,
T
A
(Note 2)
LED Supply Voltage (Max shown for
T
A
=0 to 70C, 4.4V otherwise)
NOTE 2: While the device is operational across the temperature range, functionality will vary with temperature. Specifications are
stated only
at
25°C
unless otherwise noted.
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LUMENOLOGY
2012,
TAOS Inc.
al
UNIT
V
%
V
°C
3
id
LED
cathode. Connect to
LDR
pin when using internal
LED
driver circuit.
TMD2772
DIGITAL ALS
and PROXIMITY MODULE
TAOS147E
−
DECEMBER
2012
Operating Characteristics, V
DD
= 3 V, T
A
= 25 C (unless otherwise noted)
PARAMETER
I
DD
V
OL
I
LEAK
I
LEAK
V
IH
V
IL
Supply current
TEST CONDITIONS
Active — LDR pulse off
Wait state
Sleep state — no
3 mA sink current
6 mA sink current
I
2
C
activity
0
0
−5
−5
TMD27721
TMD27723
TMD27721
TMD27723
0.7 V
DD
1.25
0.3 V
DD
0.54
MIN
TYP
195
90
2.2
4
0.4
0.6
5
5
V
MAX
250
μA
UNIT
INT,
INT SDA output low voltage
Leakage current, SDA, SCL, INT pins
Leakage current, LDR pin
SCL,
SCL SDA input high voltage
SCL,
SCL SDA input low voltage
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PARAMETER
TEST CONDITIONS
CHANNEL
CH0
CH1
MIN
TYP
E
e
= 0, AGAIN = 120
×
,
ATIME = 0xDB (100 ms)
ATIME = 0xFF
ATIME = 0xFF
0
0
1
0
0
1
1
2.58
2.73
ATIME = 0xC0
λ
p
= 625 nm, E
e
= 46.8
μW/cm
2
,
ATIME = 0xF6 (27 ms) (Note 2)
λ
p
= 850 nm, E
e
= 61.7
μW/cm
2
,
ATIME = 0xF6 (27 ms) (Note 3)
CH0
CH1
CH0
CH1
4000
4000
5000
950
5000
2900
0.19
0.58
20.4
81.5
47.3
0.16
8.0
16.0
16 0
λ
p
= 625 nm, ATIME = 0xF6 (27 ms) (Note 2)
λ
p
= 850 nm, ATIME = 0xF6 (27 ms) (Note 3)
λ
p
= 625 nm, ATIME = 0xF6 (27 ms)
(Note 2)
λ
p
= 850 nm, ATIME = 0xF6 (27 ms)
(Note 3)
AGAIN = 1
×
and AGL = 1
AGAIN = 8
×
and AGL = 0
0.152
0.43
CH0
CH1
CH0
CH1
107.2
7.2
AGAIN = 16
×
and AGL = 0
AGAIN = 120
×
and AGL = 0
14.4
14 4
108
120
The
LUMENOLOGY
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ALS Characteristics, V
DD
= 3 V, T
A
= 25 C, AGAIN = 16 , AEN = 1 (unless otherwise noted)
(Notes 1 ,2, 3)
MAX
5
5
Dark ADC count value
ADC integration time step size
ADC counts per step
ADC count value
ADC number of integration steps
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. Red 625 nm 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 typical characteristics: peak wavelength
λp
= 625 nm and spectral halfwidth
Δλ½
= 20 nm.
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.
Copyright
2012, TAOS Inc.
4
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UNIT
counts
ms
steps
counts
counts
2.9
256
1024
6000
6000
counts
65535
0.228
0.73
counts/
(μW/
cm
2
)
8.8
17 6
17.6
al
V
132
Company
id
μA
V
μA
×
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