RPM7238 series
Photo Link Module
IR Receiver Module
RPM7238 series
RPM7238series are remote control receiver module. Small-sized, light-weight, and low voltage operated (from 2.7V)
modules have been achieved by using resin mold.
Center frequency
37.9kHz
Applications
All household electric appliances such as TV, DVD, air conditioner and audio equipment.
Features
1) Low voltage operation. (V
CC
=2.7 to 3.6V)
2) Low current consumption. (I
CC
=0.3mA, V
CC
=3V)
3) Superior anti V
CC
noise characteristics.
4) 5 types of holders available to each set.
RPM7238 series
Horizontal board
RSIP-A3 (H13)
Height to lens
Products No.
15.0mm
RPM7238-H13
RSIP-A3 (H5)
9.6mm
RPM7238-H5
RSIP-A3 (H4)
15.9mm
RPM7238-H4
Vertical board
RSIP-A3 (H8)
7.2mm
RPM7238-H8
RSIP-A3 (H9)
12.0mm
RPM7238-H9
Absolute maximum ratings
(Ta = 25°C)
Parameter
Supply Voltage
Output current
Storage temperature
Symbol
V
CC
I
O
Tstg
Limits
6.3
2.0
−30
to
+100
Unit
V
mA
°C
Recommended operating conditions
(Ta = 25°C)
Parameter
Supply voltage
Operating temperature voltage
Symbol
V
CC
Topr
Min.
2.7
−10
Typ.
3.0
25
Max.
3.6
75
Unit
V
°C
Rev.A
1/6
RPM7238 series
Photo Link Module
Block diagram
V
CC
100kΩ
AMP
LIMITER
Detector
Comparator
R
OUT
I/V
BPF
GND
Terminal description
Pin No.
1
2
3
Pin name
V
OUT
GND
V
CC
Function
OUTPUT TERMINAL
GROUND
POWER SUPPLY
Electrical, Optical characteristics
(Unless otherwise noted, Ta = 25°C V
CC
=3V)
Parameter
Consumption Current
Effective Distance
High Level Output Voltage
Low Level Output Voltage
ON Pulse Width
OFF Pulse Width
Center frequency
Horizontal half angle
Vertical half angle
Symbol
I
CC
L
V
H
V
L
T
ON
T
OFF
fo
θ
1/2
θ
1/2
Min.
−
8
2.5
−
400
400
−
−
−
Typ.
300
15
−
−
600
600
37.9
45
35
Max.
500
−
−
0.5
800
800
−
−
−
Unit
µA
m
V
V
µs
µs
kHz
deg
deg
∗2
∗2
Isink
<
200µA
=
Outer light condition Ee
<
10 (Ix)
Outer light condition Ee
<
10 (Ix)
Conditions
No outside light, No signal input
Outer light condition Ee
<
10 (Ix)
∗1
∗1
∗1
∗1
∗1
∗1
600/600µs burst wave is transmitted by standard transmitter. However, it must be measured after the initial transmission pulse is 10 pulse.
∗2
It is an angle when the linear arrival distance become half.
Measurement Conditions
(1) Transmit signal
600µs
600µs
Carrier frequency=fo, Duty=50%
Fig.1 Transmit signal
Rev.A
2/6
RPM7238 series
Photo Link Module
(2) Standard transmitter
λ
peak=940nm
∆
λ=40nm
20cm
io=V
OUT
/ R
RPM-302B
Standard transmitter
R
V
OUT
Fig.2 Measurement of standard transmitter proofreading
When standard transmitter output the signal at Fig.1 standard photodiode output become io=5µAp-p under the
measurement condition Fig.2.
(The radiant intensity of standard transmitter : 50mW / sr)
RPM-302B : standard photodiode has short current Isc=27µA at Ee=1000(lx)
(using CIE standard light source A)
(3) Measurement effective distance, horizontal & vertical half angle
RPM7238 series
θ
θ
Standard transmitter
Light detector face
illuminance : Ee
Effective distance : L
(θ ; Indicates horizontal and vertical directions)
Fig.3 Measurement condition for effective distance
Effective distance L : Effective distance at
θ=0°
Fig.3
Horizontal & vertical half angle
θ:
The angle which effective distance became 50% of L.
Rev.A
3/6
RPM7238 series
Photo Link Module
Notes
(1) All characteristics of the receiver in this specification are specified by supplying burst wave form (Fig.1) with ROHM
standard transmitter (Fig.2 ).
If in case of other burst wave form will be used, please check these spec. Carefully under the evaluations.
(2) When the receiver will be used as the wire-less remote controller, please use the signal method the signal format
which refer to “Measures to prevent mulfunctioning of IR remote-controlled electric home appliances”. (Published July
1987 by Association of Electric Home Appliances)
If using other signal method, signal format, (ex: signal format which not including the leader signal) the receiver might
have chances to miss-function.
(3) Please set up transmitter’s carrier frequency as same as the receiver’s f
0
frequency. Otherwise error might be
occurred.
(4) If transmission signal has non-continues carrier, error might be occurred. Continuous carrier is necessary.
T1
T1≠T2
T2
(5) The receiver was designed to use as in-door use only.
Therefore, please understand that the receiver cannot cover all characteristics, in case of using it out-door.
(6) Noise environment (Light noise from inverter Lamp, and other kind of Lamps, Power ripple, electromagnetic noise from
power circuit, and etc) may cause a reduced effective distance.
(7) The receiver may not work properly if receiving signal judgement is done by single pulse due to the
surrounding / environmental noises.
To prevent such misjudgement, please make sure that the receiver is set up to work only when receiving
series of coded signal.
(8) Emitting unit (remote control transmitter) has to be considered about its emitting device function, characteristics and
characteristics of the receiver.
(9) Please connect ‘Holder’ on to the ‘Ground (GND)’ of PCB. If the holder is not connected to the GND, there is a
possibility of worsening the characteristics of product.
(10) Do not supply unnecessary stress to lead and holder.
(11) Please pay careful attention to the lens.
It might have a chance to miss-function when the lens get dust or dirty. And also please do not touch the lens.
(12) In order to prevent products from ESD, human body and solder iron, etc. are required to be grounded.
Rev.A
5/6
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