RPM873
Photo Link Module
IrDA Infrared Communication Module
RPM873
RPM873 is an infrared communication module for IrDA V er. 1.2 (Low Power). The infrared LED, PIN photo diode, and
LSI are all integrated into one single package. This module is designed for low pow er consumption. The very small
package makes it a perfect fit for mobile devices.
zFeatures
1) Infrared LED, PIN photo diode, LED driver and built-in receiver frequency formation circuit.
2) Applied to SIR (2.4 to 115.2kbps) low pow er standard.
3) Supply voltage range is from V
4) Surface mounting type.
5) Built-in power down function.
zApplica tions
Cellular phones, PDA, DVC, digital still cameras, printers, handy terminals and etc.
zAbsolute maximum ratings (Ta=25°C)
Parameter Symbol Limits Unit
Supply voltage V
Input voltage
Operation temperature
Storage temperature
Power dissipation
1) This applies to all pins on the basis of ground pins (1,4pin).
∗
2) In case of operating environment is over 25 , 1.33mW would be reduced per each 1 stepping up.
∗
zRecommended operating conditions (Ta=25°C)
Parameter
Supply voltage
Symbol Min. Typ. Max. Units
V
VLEDA 3.0 V2.6 5.5
Rev.B 1/6
CC=2.0 to 3.6V , VLEDA=2.6 to 5.5V.
CC
/VLEDA 7.0
Vin(5,6,7pin)
Topr
Tstg
Pd
CC
−0.3 to V
−25 to 85
−30 to 100
100
3.0 V2.0 3.6
1
∗
CC
+0.3
2
∗
V
V
°C
°C
mW
°C °C
Photo Link Module
zBlock diagram and application circuit
AMP
GND
18765432
NC
RPM873
AMPAMP
POWER
DOWN
V
CC
GND
C1
PWDOWN
RXD
TXD
LEDA
VCC(3pin) and VLEDA(8pin) can be
used on either common power source
or different one.
V
CC
GND
PWDOWN
RXD
TXD
(LEDV
CC
)
zRecommended values
Part symbol
C1
1µF, tantalum or ceramic
Ex.) TCFGA1A105M8R(ROHM)
Recommended Notice
Bigger capacitance is recommended with much noise from power supply.
Rev.B 2/6
Photo Link Module
zT erminal description
Pin No.
Terminal Circuiit Funciton
RPM873
1 GND
2NC
CC
V
3
GND
4
5
PWDOWN
6
RXD
PWDOWN
GND
This terminal must be left open.
V
CC
For preventing from infection, connect a capacitor
V
CC
between
GND
V
CC
V
CC
V
300K
Power-down control terminal
H : Power down
L : Operation
CMOS logic level input
When input is H, it will stop the receiving
circuit, PIN−PD current and transmitting
LED operation.
CC
Receiving data output teminal
CMOS logic level output
When PWDOWN (5pin) = H, the RXD output will
be pulled up to V
(3pin) and GND(4pin).
CC
at approximately 300kΩ.
V
CC
7
TXD
600k
8
LEDA
LED
Transmitting data input terminal
H : LED (PWDOWN = L)
CMOS logic level input
Holding TXD = H status, LED will be
turned off at approximately 48µs.
LED ANODE terminal
Other power source can be used
difference between VLEDA and V
This can be connected to battery kinds of unregulated
voltage source by internal constant current driver.
CC.
Rev.B 3/6
RPM873
Photo Link Module
zElectrical characteristics (V
Parameter Symbol Min. Typ. Max. Unit Conditions
Consumption current 1 I
Transmission rate
PWDOWN input high voltage
PWDOWN input low voltage
PWDOWN input high current
PWDOWN input low current
<Transmitter>
TXD input high voltage
TXD input low voltage
TXD input high current
TXD input low current
LED anode current
<Receiver>
RXD output high voltage
RXD output low voltage
RXD output rise time
RXD output fall time
RXD output pulse width
Receiver latency time
zOptical characteristics (V
Parameter Symbol Min. Typ. Max. Unit Conditions
Peak wave length
Intensity 1
Half-angle
Opticcal pulse width 1.631.42
Rise time / Fall time
Optical over shoot
Edge jitter
Minimum irradiance in angular range
Maximum irradiance in angular range
Half-angle
Maximum emitting time
1. This product is not designed for protection against radioactive rays.
2. This product does not include laser transmitter.
3. This product include one PIN photo diode.
4. This product dose not include optical load.
Rev.B 4/6
CC=3V , VLEDA=3V, Ta=25°C)
CC
1
CC
2
I
VPDH
VPDL
IPDH
IPDL
VTXH
VTXL
ITXH
ITXL
ILEDA
VRXH
VRXL
tRR
tFR
twRXD
tRT
CC=3V , VLEDA=3V, Ta=25°C)
λP
IE1
θL / 2
TWLED
Tr / Tf
Tj
Eemin
Eemax
θD / 2
TLEDmax
−
−
2.4
V
CC
−0.55
0
−1.0
−1.0
CC
−0.55
V
0
2.5
−1.0
−
CC
−0.4
V
0
−
−
1.5
−
850
−
−
−
−40
−
500
±15
10
75
0.01
99
0.2
−
−
−
0
0
−
−
0.55
1.0
1.0
−
µA
µA
kbps115.2
µA
µA
−
10
5
1.0
0
30.5
−
−
35
35
2.3
100
870 nm
104
±18
−
−
−
−
−
−
48
−
−
0.4
−
−
4.2
200
900
±30
2.02
100
6.8
−
−
120
µA
µA
mA
µs
µs
mW / Sr26
˚C
µs
ns
ns40
µW / cm
mW / cm
˚C
µs
Waiting mode, At no input light
PWDOWN mode, At no input lightConsumption current 2
V
V
PWDOWN=V
PWDOWN=0 [V]
V
V0.55
TXD=V
CC
[V]
TXD=0 [V]
V
IRXH= −200µA
V
IRXL= 200µA
ns
CL=15pF
ns
%25
L
=15pF
C
L
=15pF, 2.4 to 115.2kbps
C
<−<
L
15°
−15° θ
−
TXD=1.63µs pulse input
10% to 90%
2
<−<
−15° θ
L
15°
−
2
<−<
−15° θ
L
15°
−
TXD=V
CC
CC
[V]
Photo Link Module
zTiming chart
(Emitting side)
TXD
(7pin)
less than 48 µs
RPM873
more than 48 µs
Internal LED
(Light output)
(Detecting side)
Light input
RXD
(6pin)
PWDOWN
(5pin)
(emitting)
approximately 48 µs
less than 2.3 µs more than 2.3 µs
approximately 2.3 µs
(emitting)
(emitting)
pull up to V
300 kΩ
CC
at approximately
zNotes
1) VLEDA (8pin) and V
•Other power source can be used dif ference between VLEDA and V
CC (3pin)
CC.
2) Caution in designing board lay-out
T o get maximum potential from RPM873, please keep in mind following instruction.
•The line of RXD (6pin) should be connected at backside via through hole close to RPM873 pin lead.
Better not to be close to photo diode side (1pin).
⇒This is to minimize feedback supplied to photo diode from RXD.
•Better to be placed more than 1.0cm in radius from photo diode (pin1 side) and also away from the parts w hich
generate noise, such as DC / DC converter.
•As for C1 between 3-4pin should be placed close to RPM873.
3) Notes
•Please be sure to set up the TXD (7pin) input to be “L” (under 0.55V) except transmitting data
(for<90µs, ON duty<20%)
•Power dow n current might increase if exposed by strong light (ex. direct sunlight) at pow er down mode.
•Please use by the signal format wh ich is specified by lrDA Ver1.2 (2.4k to 115.2kbps).
There might be on error if used by different signal format.
4) Eye Safe
•IEC825-1 (EN60825-1) Class 1 Eye Safe.
Rev.B 5/6
Photo Link Module
z Dimensions Diagram (Unit : mm)
1
7.6
R1.1
5.6
3.8
RPM873
R1.0
2.72
2
1
0.37±0.10
0.95
P0.95 × 7=6.65
RSLP8
1
LEDPin PD
0.78
2.49
0.8
8
0.76
Rev.B 6/6
Appendix
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document are no antiradiation design.
Notes
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level of
reliability and the malfunction of with would directly endanger human life (such as medical instruments,
transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other
safety devices), please be sure to consult with our sales representative in advance.
About Export Control Order in Japan
Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control
Order in Japan.
In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause)
on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.
Appendix1-Rev1.1
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