TMD2772/
TMD2772WA
Digital ALS and Proximity Module
General Description
The TMD2772/TMD2772WA 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 and are
available with 25° and 50° fields of view. 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/TMD2772WA ALS is based on the
ams
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.
Ordering Information
and
Content Guide
appear at end of
datasheet.
Key Benefits & Features
The benefits and features of TMD2772/TMD2772WA, Digital ALS
and Proximity Module are listed below:
Figure 1:
Added Value of Using TMD2772/TMD2772WA
Benefits
•
Minimizes board space requirements
Features
•
Ambient light sensing, proximity detection, and IR LED
in a single module
•
Ambient light sensing (ALS)
• Wide variety of programmable features which
enable 8,000,000:1 dynamic range with very high
sensitivity
•
Approximates human eye response over a
wide variety of lighting conditions. Achieves
accurate sensing behind spectrally dark glass.
ams Datasheet
[v1-21] 2016-Feb-16
Page 1
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TMD2772/ TMD2772WA −
General Description
Benefits
•
Eliminates need for customer end-product
calibration.
•
Reduces the proximity noise
•
Control of system crosstalk and offset
•
Prevents false proximity detection in bright
light
•
Selectable IR power-level without external
resistor
•
Enables wide operating range
Features
•
Proximity detection
• Calibrated and trimmed to provide consistent
reading
• Reduced proximity count variation
(1)
• Programmable offset
(1)
• Saturation indicator bit
(1)
• Programmable driver for IR LED
• 16,000:1 dynamic range
•
Maskable ALS and proximity interrupt
• Programmable upper and lower thresholds with
persistence filter
•
Power management
• Programmable average power consumption
• Programmable wait time from 2.7 ms to > 8
seconds
•
I²C fast mode compatible interface
• Data rates up to 400 kbit/s
• Input voltage levels compatible with V
DD
or 1.8V
bus
•
3.94 mm x 2.36 mm x 1.35 mm package
•
Available with standard 25° (TMD2772) and wide 50°
(TMD2772WA)
•
Reduces external processor burden
•
Enables dynamic power dissipation control
•
Industry standard two-wire interface
•
Small foot-print module
•
Optimize ambient light sensing angle
Note(s):
1. New or Improved feature.
Applications
The TMD2772 applications include:
•
Display Backlight Control
•
Cell Phone Touch Screen Disable
•
Mechanical Switch Replacement
•
Industrial Process Control
•
Medical Diagnostics
•
Printer Paper Alignment
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ams Datasheet
[v1-21] 2016-Feb-16
TMD2772/ TMD2772WA −
General Description
Block Diagram
The functional blocks of this device are shown below:
Figure 2:
TMD2772/TMD2772WA Block Diagram
LEDA LEDK
IR
LED
LDR
V
DD
Programmable
Current Sink
CH0 ADC
CH0
Control
INT
I²C Interface
CH1 ADC
CH1
SCL
SDA
TMD2772/TMD2772WA
ams Datasheet
[v1-21] 2016-Feb-16
Page 3
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TMD2772/ TMD2772WA −
Pin Assignment
Pin Assignment
Figure 3:
Pin Diagram (Top View)
This is a Package Module - 8 pin diagram. Package drawing is
not to scale.
TMD2772
TMD2772WA
VDD
SCL
1
2
8
7
6
SDA
INT
LDR
VDD
SCL
1
2
8
7
6
SDA
INT
LDR
GND 3
LEDA 4
GND 3
LEDA 4
5 LEDK
5 LEDK
Figure 4:
Pin Description
Pin Number
1
2
3
4
5
6
7
8
Pin Name
V
DD
SCL
GND
LEDA
LEDK
LDR
INT
SDA
Pin Type
Power
Input
Power
Supply voltage.
Description
I²C serial clock input terminal — clock signal for I²C
serial data.
Power supply ground. All voltages are referenced
to GND.
LED anode.
LED cathode. Connect to LDR pin when using
internal LED driver circuit.
LED driver input for proximity IR LED, constant
current source LED driver.
Output
Input / Output
Interrupt — open drain (active low).
I²C serial data I/O terminal — serial data I/O for I²C.
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ams Datasheet
[v1-21] 2016-Feb-16
TMD2772/ TMD2772WA −
Absolute Maximum Ratings
Absolute Maximum Ratings
Stresses beyond those listed under
Absolute Maximum Ratings
may cause permanent damage to the device. These are stress
ratings only. 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 rating conditions for extended periods may affect
device reliability.
Figure 5:
Absolute Maximum Ratings
Symbol
V
DD
(1)
Supply Voltage
Parameter
Min
Max
3.8
Unit
V
V
LDR
(2)
Voltage on LDR signal with LDR = off.
•
T
A
between
0° C - 70° C
•
T
A
between
-30° C - 70° C
•
T
A
outside of -30° C - 85° C
LED supply voltage on LEDA input
•
T
A
between
0° C - 70° C
•
T
A
between
•
T
A
outside of
-30° C - 70° C
-30° C - 85° C
-0.5
-1
-40
-30
4.8
4.6
4.4
V
V
LEDA
(3)
4.8
4.6
4.4
3.8
20
85
85
V
V
IO
I
Out
T
stg
T
A
I
SCR
Digital I/O Voltage except LDR
Output terminal current except LDR
Storage temperature range
Operating free-air temperature
Input Current
(latch up immunity)
JEDEC JESD78D Nov 2011
Electrostatic Discharge HBM
JS-001-2014
Electrostatic Discharge CDM
JEDEC JESD22-C101F Oct 2013
V
mA
°C
°C
CLASS 1
µA
ESD
HBM
ESD
CDM
± 2000
± 500
V
V
Note(s):
1. All voltages are with respect to GND.
2. Maximum voltage with LDR = off.
3. 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.
ams Datasheet
[v1-21] 2016-Feb-16
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