ROM-WT138TM2(N)
IR Receiver Modules for Remote Control Systems
Description
The CLT 138TM(N) series are remote control receiver
modules. Pin diode and receiver IC are assembled on
one module. Small- sized, light-weight, and low current
consumption. modules have been achieved by using resin
mold. The demodulated output signal can directly be
decoded by a microprocessor.
The main benefit is the reliable function even in disturbed
ambient and the protection against uncontrolled output
pulses.
Features
ƒ Supply Voltage Range: 2.7V to 6 V
ƒ TTL and CMOS compatibility
ƒ Photo detector and preamplifier in one package.
ƒ Internal filter for PCM frequency
ƒ Open collector output (built-in Pull-up resistor(40 ㏀ ))
ƒ Output active low
ƒ Enhanced Immunity against all kinds of disturbance light
ƒ No occurrence of disturbance pulses at output pin
within nominal conditions.
ƒ Short settling time after power On.( below 1msec)
F
D
lia
rT
P
Applications
ƒ Av equipment (TV, DVD, Audio, CD player)
ƒ Home appliances (Computer, Air conditioner, Camera)
ƒ Infrared remote control Toys.
Suitable Data Format
ƒ NEC, RC5, RC6, Toshiba Micon Code, Sharp Code, Grundig Code
ƒ Sony 12bit, Sony 15bit, Matsushita code, Mitsubishi Code, Zenith Code, JVC code
Block Diagram
Ordering Info.(carrier frequencies)
VCC
AGC
Input
PIN
Diode
Type
Post
Amp.
BPF
AGC
Control
Waveform
Detector
&
ATC
40㏀
OUT
Waveform
Rectifier
RCLT
RCLT
RCLT
RCLT
RCLT
132TM(N)
136TM(N)
138TM(N)
140TM(N)
156TM(N)
Carrier
Frequency
32.7 ㎑
36.7 ㎑
37.9 ㎑
40.0 ㎑
56.7 ㎑
GND
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ROM-WT138TM2(N)
Application Circuit
VCC
47~100Ω
CLT 138 M(N)
Transmitter
VCC
47㎌
MCU
VOUT
C
I
GND
GND
R-C filter recommended to suppress power supply disturbances.
R-C filter should be connected closely between VCC pin and GND pin.
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Absolute Maximum Ratings
Parameter
Symbol
Supply Voltage
VCC
Supply Current
ICC
F
D
VOUT
Output Voltage
Output Current
IOUT
Operating Temperature
Storage Temperature
Soldering Temperature
Ratings
Unit
6.5
V
㎃
V
2.5
㎃
-20 ~ +80
℃
Tstg
-30 ~ +85
℃
Tsd
260℃±5℃, Max 5 sec
℃
Topr
P
rT
(Ta = 25℃)
Electro-optical Characteristics
Parameter
(Ta = 25℃)
Symbol
Conditions
Min
Typ
Max
Unit
2.7
-
6.0
V
0.8
1.2
1.5
㎃
Supply Voltage
VCC
Supply Current
ICC
B.P.F Center Frequency
fO
-3
fo
+3
％
Peak Wave Length
λP
-
940
-
㎚
High Level Output Voltage
VOH
Fig.1
Vcc-0.5
-
-
V
Low Level Output Voltage
VOL
Fig.1
-
0.2
0.4
V
High Level Output Pulse Width
TWH
Fig.1
450
600
750
㎲
Low Level Output Pulse Width
TWL
Fig.1
450
600
750
㎲
±0˚
-
20
-
m
±30˚
-
17
-
m
±45˚
-
15
-
m
Arrival Distance
L
Output Form
No input signal
Fig.
1,2,3
Active Low
** Arrival Distance Effected by Environment
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ROM-WT138TM2(N)
Measurement Conditions
[ Fig.1 ] f=37.9KHz, burst with 22 pulses
600 ㎲
600 ㎲
Input
Output pulse
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[ Fig.2 ] Transmitter
rT
PD
S/Transmitter
F
D
30㎝
10㏀
10㏀
VCC
10㎌
VOUT
GND
P
※ The specifications shall be satisfied under the following conditions. The standard transmitter
shall be specified of the burst wave form adjusted to VOUT 200mVp-p upon Po measuring
circuit Standard Transmitter
[ Fig.3 ] Test condition of arrival distance
Vout
osc
Transmitter
GND
Vcc
: Indicates horizontal and
vertical directions
[ Measurement condition for arrival distance ]
☞ Ambient light source : Detecting surface illumination shall be irradiate 200±50Lux
under ordinary white fluorescence lamp without high frequency lighting
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ROM-WT138TM2(N)
Electrical/Optical Characteristics
[ Fig.5 ] Sensitivity vs. Supply Voltage
[ Fig.4 ] Supply Current vs. Voltage
100
Relative Sensitivity(%)
2.0
1.5
1.0
0.5
60
40
20
0
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0.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
2.5
6.5
Supply Voltage(V)
[ Fig.6 ] Output Pulse Width vs. Distance
800
Output Pulse Width(㎲)
80
F
D
700
600
500
400
300
0
4
8
12
16
P
20
24
rT
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
Supply Voltage(V)
[ Fig.7 ] Directivity (Horizontal/Vertical)
0˚
20˚
40˚
Relative Radiant(˚)
Supply Current(㎃)
2.5
100
60˚
V
90
H
80
28
60
80˚
40 20 0
Relative Sensitivity(%)
Transmission Distance(m)
ESD Test Results
[ Fig.8 ] BPF Fc Curve
BPF fc
1.2
Parameter
Conditions
Specification
Results
Relativ e responsiv ity
1
0.8
0.6
0.4
0.2
0
0.5
0.6 0.7
0.8 0.9
1
1.1
1.2 1.3
Machine
Model
C=200㎊,
R=0Ω
Min
±200V
>±200V
Human Body
Model
C=100㎊,
R=1.5㏀
Min
±2000V
>±2000V
Charged
Device
Model
R=100㏁,
1Ω
Min
±800V
>±800V
1.4 1.5
f/fo Relative Frequency
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ROM-WT138TM2(N)
Suitable Data Format
The circuit of the CLT 138 M(N) series is designed in that way that unexpected output pulses due
to noise or disturbance signals are avoided. A band pass filter, an integrator stage and an automatic
gain control are used to suppress such disturbances.
The distinguishing mark between data signal (not suppressed) and disturbance signal (suppressed) are
carrier frequency, burst length and Signal Gap Time (see diagram below).
The data signal should full-fill the following condition :
ƒ Carrier frequency should be close to center frequency of the band-pass.
ƒ Burst length should be 300us/burst or longer.
ƒ After each burst a gap time of at least 300us is necessary.
ƒ The data format should not make a continuous signal transmission.
ƒ There must be a Signal Gap Time (longer than 20 ms) at least each 100 ms, or each data command.
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Some examples for suitable data format are :
NEC Code, RC5, Toshiba Code, Matsushita Code. Mitsubishi Code. Sony Code.
[ Fig. 8 ] Data Signal diagram
Data Word
F
D
enlarge
t Burst
P
rT
t Pause
Carrier Frequency : fo
t Gap
(Output pulse)
※ t Gap : Signal gap time between two burst in pulses of carrier.
※ t pause : Data pause between two data words.
※ t Burst : Length of a burst in pulses of the carrier frequency.
Disturbance Suppression
When a disturbance signal is applied to the CLT 138 M(N) series. it can still receive the data signal.
However the sensitivity is reduced to that level that no unexpected pulses will occurrence.
Some examples for such disturbance signals which are suppressed by the C
138 M(N) series are :
ƒ Signals from fluorescent lamps with electronic ballast with high or low modulation.
ƒ Continuous signal at 38 kHz or at any other frequency,
ƒ DC light (from tungsten bulb or sunlight)
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ROM-WT138TM2(N)
NOTE:
1. PIN CONFIG.
1 Vout
2 GND
3 Vcc
2. G.T ±0.3
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(UNIT:mm)
F
D
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N 3
1
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