TAOS Inc.
is now
ams AG
The technical content of this TAOS datasheet is still valid.
Contact information:
Headquarters:
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8141 Unterpremstaetten, Austria
Tel: +43 (0) 3136 500 0
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Please visit our website at
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r
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TMD2672
DIGITAL PROXIMITY DETECTOR
TAOS149C − AUGUST 2012
Features
D
Digital Proximity Detector, LED Driver, and
D
IR LED in a Single Optical Module
Register Set- and Pin-Compatible with the
TMD2671 Series
−
−
−
−
−
−
V
DD
1
SCL 2
GND 3
LEDA 4
PACKAGE
MODULE−8
(TOP VIEW)
8 SDA
7 INT
6 LDR
5 LEDK
D
Proximity Detection
D
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
D
3.94 mm
y
2.36 mm
y
1.35 mm Package
*
New or improved feature
Description
The TMD2672 family of devices provides 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 TMD2671 series
and includes new and improved proximity detection features. The proximity detection includes improved
signal-to-noise and accuracy. 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. Interrupts have been
enhanced with the addition of a sleep-on-interrupt feature that also allows for a single cycle operation. The
device internal state machine provides the ability to put the device in a low-power mode in between proximity
measurements, providing very low average power consumption.
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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D
D
Paper Alignment
D
D
D
D
HDTVs
White Goods
Toys
Digital Signage
Printing
Reduced Proximity Count Variation
*
Programmable Offset Control Register
*
Saturation Indicator
*
Programmable Integration Time and Offset
Current Sink Driver for IR LED
16,000:1 Dynamic Range
D
Maskable Proximity Interrupt
− Programmable Upper and Lower
Thresholds with Persistence Filter
D
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
Package Drawing is Not to Scale
Applications
D
Mobile Handset Touchscreen Control and
Automatic Speakerphone Enable
Mechanical Switch Replacement
End Products and Market Segments
D
Mobile Handsets, Tablets, Laptops and
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.
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TMD2672
DIGITAL PROXIMITY DETECTOR
TAOS149C − AUGUST 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 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.
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TMD2672
DIGITAL PROXIMITY DETECTOR
TAOS149C − AUGUST 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.
LED cathode. Connect to LDR pin when using internal LED driver circuit.
Available Options
DEVICE
ADDRESS
0x39
0x39
0x29
0x29
LEADS
TMD26721
TMD26723
Module−8
Module−8
Module−8
Module−8
I
2
C Vbus = V
DD
Interface
I
2
C Vbus = V
DD
Interface
TMD26725
†
TMD26727
†
†
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.
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
2.6
3
−3
−30
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INTERFACE DESCRIPTION
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MAX
3.6
3
85
ORDERING NUMBER
TMD26721
TMD26723
TMD26725
TMD26727
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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)
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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TMD2672
DIGITAL PROXIMITY DETECTOR
TAOS149C − AUGUST 2012
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
TMD26721
SCL,
SCL SDA input high voltage
SCL,
SCL SDA input low voltage
TMD26723
TMD26721
TMD26723
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
195
90
2.2
4
0.4
0.6
5
5
V
μA
μA
V
V
MAX
250
μA
UNIT
PARAMETER
I
DD
Supply current
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TEST CONDITIONS
MIN
TYP
LED On
3
LED On, PDRIVE = 0
LED On, PDRIVE = 1
LED On, PDRIVE = 2
LED On, PDRIVE = 3
100
50
25
12.5
2.73
1
0
0
PTIME = 0xFF ( = 1 conversion step)
PTIME = 0xFF ( = 1 conversion step)
PPULSE = 1, PDRIVE = 0
PPULSE = 2, PDRIVE = 0
2.58
7.3
16.0
PPULSE = 8, PDRIVE = 0, PGAIN = 4
×
, (Note 2)
100
73 mm
×
83 mm, 90% reflective Kodak Gray Card,
PGAIN = 4
×,
PPULSE = 8, PDRIVE = 0, PTIME = 0xFF
(Note 4)
450
520
V
DD
V
DD
1
mF
GND
1
TMD2672
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
LEDA
LEDA current (Note 1)
PTIME
PTIME
PTIME
PPULSE
LED On
ADC conversion steps
ADC conversion time
ADC counts per step
LED pulses (Note 5)
LED pulse width
LED pulse period
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. 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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2012, TAOS Inc.
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UNIT
mA
mA
256
2.9
steps
ms
counts
pulses
μs
μs
counts
1023
255
590
counts
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id
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