TMD4903
Color and Proximity Sensor Module
with mobeam™ Barcode Emulation
and IR Remote Control
General Description
The TMD4903 features ambient light and color (RGB) sensing,
proximity detection and IRBeam optical pattern generator
capable of mobeam™ barcode emulation and IR remote control.
In addition, the device integrates an IR LED and advanced LED
driver, all within a low-profile and small footprint,
2.0mm x 5.0mm x 1.0mm package.
The Proximity sensing function synchronizes IR emission and
detection to sense proximity events. The architecture of the
engine features self-maximizing dynamic range, ambient light
subtraction, advanced crosstalk cancelation, 14-bit data
output, 32-dataset FIFO, and interrupt-driven I²C
communication. Sensitivity, power consumption, and noise can
be optimized with adjustable IR LED timing and power. The
proximity engine recognizes detect/release events and
produces a configurable interrupt whenever proximity result
crosses upper or lower threshold settings.
The Ambient Light and Color Sensing function provides Red,
Green, and Blue (RGB) ambient light sensing with a Clear
reference (C). The color diode array has a UV/IR blocking filter
and parallel ADCs to produce simultaneous 16-bit results. This
architecture accurately measures ambient light and enables the
calculation of illuminance, chromaticity, and color temperature
to manage display appearance.
The IRBeam pattern generator supports mobeam™ barcode
emulation and IR remote control. The engine features RAM for
pattern storage and specialized control logic that is tailored to
repetitively broadcast a barcode pattern using the integrated
LED or an external LED with a low side driver. The IRBeam engine
features adjustable timing, looping, and IR intensity to
maximize successful transmission. IRBeam is designed to
support all requirements for 1-D barcode transmission over IR
to point-of-sale (POS) terminals as well as IR remote control.
Ordering Information
and
Content Guide
appear at end of
datasheet.
ams Datasheet
[v1-13] 2017-Jun-20
Page 1
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TMD4903 −
General Description
Key Benefits & Features
The benefits and features of TMD4903, Color and Proximity
Sensor Module with mobeam™ Barcode Emulation and IR
Remote Control are listed below:
Figure 1:
Added Value of Using TMD4903
Benefit
•
•
•
•
•
•
•
•
•
•
•
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Feature
Selectable direction sensitivity
Ambient light rejection
Advanced crosstalk compensation
AFE saturation flag
Programmable LED driver
Interrupt-Driven I²C communication
Variable sensitivity
Designed to operate behind inked glass
UV/IR blocking filter
Programmable gain and integration time
6.7M:1 dynamic range by gain adjustment only
Interrupt-driven I²C communication
•
Proximity detection
•
Ambient light and color sensing
•
IRBeam pattern generator
•
mobeam™ support
•
Universal remote control support
•
Interrupt-driven I²C communication
•
Calibrated emission and response
•
Invisible 950nm emission
•
1.8V operation
•
Integrated LED and driver
•
Low supply voltage
Applications
The TMD4903 applications include:
•
Color sensing
•
Ambient light sensing
•
Cell phone touch screen disable
•
Mechanical switch replacement
•
1D barcode emulation
•
Universal remote control
Page 2
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ams Datasheet
[v1-13] 2017-Jun-20
TMD4903 −
Pin Assignment
Pin Assignment
The device pin assignments are described below.
Figure 3:
Pin Diagram
R
Pin Description
Figure 4:
Pin Description
Pin Number
1
2
3
4
5
6
7
8
Pin Name
V
DD
SCL
GND
LEDA
LDR
GPIO
INT
SDA
Supply voltage (1.8V)
I²C serial clock terminal
Description
Ground. All voltages are referenced to GND
LED anode
LED driver (sinks current) and LED cathode (for direct access to LED)
Open drain IRBeam output or alternate interrupt
Interrupt. Open drain output and logic level output for external IR
LED circuit
I²C serial data I/O terminal
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ams Datasheet
[v1-13] 2017-Jun-20
TMD4903 −
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
V
LEDA
V
IO
V
LDR
I
IO
T
strg
ESD
HBM
Parameter
Supply voltage
LED anode supply
Digital I/O terminal voltage
Terminal voltage
Output terminal current
Storage temperature range
ESD tolerance, human body
model
Min
-0.3
-0.3
-0.3
-0.3
-1
-40
±2000
Max
2.2
3.6
3.6
3.6
20
85
Units
V
V
V
V
mA
ºC
V
Comments
See note
(2)
Note(s):
1. All voltages with respect to GND.
2. Measured with LDR = OFF or LDR = ON and LDRIVE = 310mA.
ams Datasheet
[v1-13] 2017-Jun-20
Page 5
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