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The technical content of this TAOS datasheet is still valid.
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TMD2671
DIGITAL PROXIMITY DETECTOR
TAOS144B − SEPTEMBER 2012
Features
D
Digital Proximity Detector, LED Driver, and
IR LED in a Single Optical Module
PACKAGE
MODULE−8
(TOP VIEW)
D
Proximity Detection
− Calibrated to 100-mm Detection
− Integrated IR LED and Synchronous LED
Driver
− Programmable Number of IR Pulses
− Programmable Current Sink for the IR
LED — No Limiting Resistor Needed
− Programmable Interrupt Function with
Upper and Lower Threshold
V
DD
1
SCL 2
GND 3
LEDA 4
8 SDA
7 INT
6 LDR
5 LEDK
Package Drawing is Not to Scale
Applications
D
D
D
Description
The TMD2671 family of devices provides a complete proximity detection system and digital interface logic in
a single 8-pin package. The proximity detector includes a digital proximity sensor with integrated LED driver,
and IR LED. The proximity function is calibrated to 100 mm (without cover glass), thus eliminating the need for
end-equipment or sub-assembly factory calibration. The proximity detection feature operates from sunlight to
dark rooms. The wide dynamic range also allows for operation in short distance detection behind dark glass
such as with a cell phone. An internal state machine provides the ability to put the device into a low-power mode
providing very low average power consumption. The addition of the micro-optics lenses within the module
provide highly efficient transmission and reception of infrared energy, which lowers overall power dissipation
for the detection function.
The proximity function specifically targets near-field proximity applications. In cell phones, the proximity
detection can detect when the user positions the phone close to their ear. The device is fast enough to provide
proximity information at a high repetition rate needed when answering a phone call. This provides both improved
green
power saving capability and the added security to lock the screen when the user may accidently deploy
a touch.
Communication with the device is accomplished with a simple 2-wire I
2
C interface with data rates up to 400 kHz.
An interrupt output pin is provided for connection to the host processor. This interrupt pin can be used to
eliminate the need to poll the device on a repetitive basis. There is also a digital filter that compares the proximity
ADC results to programmed values so that an interrupt is only generated upon a proximity event.
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The TMD2671 is packaged in a very small form factor 8-pin optical package. The PCB board area required is
only 9.36 mm
2,
which is far smaller than discrete solutions. Also, the package height is only 1.35 mm, which
makes the TMD2671 device suitable for very thin mechanical applications.
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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
D
Cell Phone Touch Screen Disable
D
Automatic Speakerphone Enable
D
Automatic Menu Popup
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Copyright
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2012, TAOS Inc.
D
Programmable Wait Timer
− Wait State — 65
mA
Typical Current
− Programmable from 2.72 ms
to > 8 Seconds
I
2
C Interface Compatible
− Up to 400 kHz (I
2
C Fast Mode)
Dedicated Interrupt Pin
3.94 mm
y
2.36 mm
y
1.35 mm Package
Sleep Mode — 2.5
mA
Typical
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TMD2671
DIGITAL PROXIMITY DETECTOR
TAOS144B − SEPTEMBER 2012
Functional Block Diagram
LDR
V
DD
IR LED Constant
Current Sink
LEDA
Prox
Integration
Channel 0
LEDK
Wait Control
Channel 1
Prox Control
Prox
ADC
Prox
Data
Lower Limit
Upper Limit
Interrupt
INT
I
2
C Interface
SCL
SDA
GND
Detailed Description
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 proximity
value. An interrupt is generated when the value of a 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.
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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 (LDR) pin, is connected to the LED cathode (LEDK) to provide
a factory calibrated proximity of 100 mm,
±
20 mm. 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. While the
device
is factory calibrated at a given pulse count, 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.
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TMD2671
DIGITAL PROXIMITY DETECTOR
TAOS144B − SEPTEMBER 2012
Terminal Functions
TERMINAL
NAME
GND
INT
LDR
LEDA
LEDK
SCL
SDA
V
DD
NO.
3
7
6
4
5
2
8
1
O
I
I
O
I
I/O
TYPE
DESCRIPTION
Power supply ground. All voltages are referenced to GND.
Interrupt — open drain.
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.
LED cathode. Connect to LDR pin when using internal LED driver circuit.
Available Options
DEVICE
ADDRESS
0x39
0x39
LEADS
8
8
TMD26711
I
2
C Vbus = V
DD
Interface
TMD26713
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
Analog voltage range, LDR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 3.8 V
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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I
2
C Vbus = 1.8 V Interface
MIN
NOM
2.6
3
−3
−30
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INTERFACE DESCRIPTION
lv
TMD26711
MAX
3.6
3
85
ORDERING NUMBER
TMD26713
Supply voltage, V
DD
Supply voltage accuracy, V
DD
total error including transients
Operating free-air temperature, T
A
(Note 2)
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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UNIT
V
%
°C
Copyright
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2012, TAOS Inc.
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TMD2671
DIGITAL PROXIMITY DETECTOR
TAOS144B − SEPTEMBER 2012
Operating Characteristics, V
DD
= 3 V, T
A
= 255C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
Active: Proximity and Wait Delay states
I
DD
Supply current
Wait mode
Sleep mode
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
TMD26711
SCL,
SCL SDA input high voltage
SCL,
SCL SDA input low voltage
TMD26713
TMD26711
TMD26713
0.7 V
DD
1.25
0.3 V
DD
0.54
6 mA sink current
0
0
−5
MIN
TYP
175
65
2.5
4
0.4
0.6
5
10
V
μA
μA
V
V
MAX
250
μA
UNIT
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PARAMETER
TEST CONDITIONS
MIN
TYP
3
PTIME = 0xFF
PTIME = 0xFF
2.72
1
0
0
16.3
PDRIVE = 0 (100% current)
PDRIVE = 1 (50% current)
PDRIVE = 2 (25% current)
PDRIVE = 1
100
50
25
PDRIVE = 3 (12.5% current)
12.5
7.2
PDRIVE = 0, PPULSE = 8 (Note 2)
100
73 mm
×
83 mm, 90% reflective Kodak
Gray Card,
PPULSE = 8, PDRIVE = 0, PTIME =
0xFF (Note 4)
414
520
V
DD
V
DD
1
mF
GND
1
TMD2671
3
4
5
6
LEDA
LEDK
LDR
1
mF
22
mF
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Proximity Characteristics, V
DD
= V
LEDA
= 3 V, T
A
= 255C, PEN = 1 (unless otherwise noted)
MAX
I
DD
Supply current — LDR pulse on
ADC conversion time step size
ADC counts per step
ADC number of integration steps
Proximity IR LED pulse count
Proximity pulse period
I
LEDA
LED current @ V 600 mV, LDR pin sink (Note 1)
mV
T
LDR
On time per pulse
Proximity response, no target (offset)
Prox count, 100-mm target (Note 3)
NOTES: 1. Value is factory-adjusted to meet the Prox count specification. Considerable variation (relative to the typical value) is possible after
adjustment.
2. No reflective surface above the module. Proximity offset varies with power supply characteristics and noise.
3. I
LEDA
is factory calibrated to achieve this specification. Offset and crosstalk directly sum with this value and is system dependent.
4. No glass or aperture above the module. Tested value is the average of 5 consecutive readings.
5. These parameters are ensured by design and characterization and are not 100% tested.
6. Proximity test was done using the following circuit. See the
Application Information: Hardware
section for recommended
application circuit.
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Copyright
E
2012, TAOS Inc.
The
LUMENOLOGY
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UNIT
mA
ms
steps
counts
pulses
μs
256
255
1023
mA
μs
Counts
624
counts
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