RPM873
Photo Link Module
Rev.B 1/6
IrDA Infrared Communication Module
RPM873
RPM873 is an infrared communication module for IrDA Ver . 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 power st andard.
3) Supply voltage range is from VCC=2.0 to 3.6V, VLEDA=2.6 to 5.5V.
4) Surface mounting type.
5) Built-in power dow n function.
zA pplications
Cellular phones, PDA, DVC, digital still cameras, printers, handy terminals and etc.
zA bsolute maximum ratings (Ta=25°C)
Parameter Symbol Limits Unit
Supply voltage V
CC
/VLEDA 7.0
−25 to 85
−30 to 100
V
V
mW
−0.3 to V
CC
+0.3
100
Operation temperature
Storage temperature
Power dissipation
Input voltage
Topr
Tstg
Vin(5,6,7pin)
Pd
°C
°C
∗
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.
°C °C
∗
1
∗
2
zRecommended operating conditions (Ta=25°C)
Parameter Symbol Min. Typ. Max. Units
Supply voltage V
CC
3.0 V2.0 3.6
VLEDA 3.0 V2.6 5.5
RPM873
Photo Link Module
Rev.B 2/6
zBlock diagram and applica tion circuit
AMP
18765432
AMPAMP
POWER
DOWN
V
CC
V
CC
V
CC
(3pin) and VLEDA(8pin) can be
used on either common power source
or different one.
GND
C1
GND
NC
GND
PWDOWN
RXD
TXD
LEDA
PWDOWN
RXD
TXD
(LEDV
CC
)
zRecommended values
Part symbol
C1
Recommended Notice
1µF, tantalum or ceramic
Ex.) TCFGA1A105M8R(ROHM) Bigger capacitance is recommended with much noise from power supply.
RPM873
Photo Link Module
Rev.B 3/6
zTerminal description
This terminal must be left open.
Terminal Circuiit Funciton
Pin No.
1 GND GND
Power-down control terminal
CMOS logic level input
When input is H, it will stop the receiving
circuit, PIN−PD current and transmitting
LED operation.
H : Power down
L : Operation
Receiving data output teminal
CMOS logic level output
When PWDOWN (5pin) = H, the RXD output will
be pulled up to V
CC
at approximately 300kΩ.
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 VCC.
This can be connected to battery kinds of unregulated
voltage source by internal constant current driver.
2NC
PWDOWN
RXD
TXD
LEDA
3
4
5
6
7
8
VCC
GND GND
V
CC
For preventing from infection, connect a capacitor
between V
CC
(3pin) and GND(4pin).
LED
V
CC
V
CC
PWDOWN
300K
V
CC
V
CC
600k
RPM873
Photo Link Module
Rev.B 4/6
zElectrical characteristics (VCC=3V, VLEDA=3V, Ta=25°C)
Parameter Symbol Min. Typ. Max. Unit Conditions
Consumption current 1 ICC1
ICC2
VPDH
VPDL
IPDH
IPDL
75 µA
PWDOWN=V
CC
[V]
Waiting mode, At no input light
PWDOWN mode, At no input lightConsumption current 2
Transmission rate
PWDOWN input high voltage
PWDOWN input low voltage
PWDOWN input high current
PWDOWN input low current
TXD input high voltage
TXD input low voltage
RXD output high voltage
RXD output rise time
RXD output fall time
RXD output pulse width
Receiver latency time
RXD output low voltage
TXD input high current
TXD input low current
LED anode current
−
0.01
−
0
−
2.4
−
−
V
CC
−0.55
V
CC
−0.55
0.55
99
µA
0.2
kbps115.2
V
V
−
<Transmitter>
<Receiver>
VTXH
VTXL
ITXH
ITXL
ILEDA
VRXH
VRXL
tRR
tFR
tRT
twRXD
PWDOWN=0 [V]
TXD=V
CC
[V]
TXD=0 [V]
0
−1.0
0
2.5
−1.0
−
0
−
−
1.5
−
V
CC
−0.4
0
−1.0
−
−
5
0
30.5
−
−
35
35
2.3
100
µA
1.0
µA
1.0
V
V0.55
µA
µA
mA
V
V
ns
ns
µs
µs
−
10
1.0
−
−
0.4
−
−
4.2
200
IRXH= −200µA
IRXL= 200µA
C
L
=15pF
C
L
=15pF
C
L
=15pF, 2.4 to 115.2kbps
zOptical characteristics (VCC=3V, VLEDA=3V, Ta=25°C)
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.
Parameter Symbol Min. Typ. Max. Unit Conditions
Peak wave length λP
IE1
θL / 2
θD / 2
TLEDmax
Tr / Tf
Tj
Eemin
870 nm
−15° θ
L
15°
TXD=V
CC
10% to 90%
Intensity 1
Half-angle
Rise time / Fall time
Optical over shoot
Edge jitter
Minimum irradiance in angular range
Half-angle
Maximum emitting time
850
104
−
±18
−
−
900
mW / Sr26
TWLED TXD=1.63µs pulse input
Opticcal pulse width 1.631.42 µs
2.02
µW / cm2
ns
µs
±30
100
−
−
−
−
−
48
−40
−
±15
10
%25
ns40
6.8
Eemax −15° θ
L
15°
Maximum irradiance in angular range mW / cm2
−
500 −
−
120
˚C
˚C
−15° θ
L
15°
<
−<
−
<
−<
−
<
−<
−
RPM873
Photo Link Module
Rev.B 5/6
zTiming chart
less than 48 µs
(emitting)
more than 48 µs
approximately 48 µs
less than 2.3 µs more than 2.3 µs
approximately 2.3 µs
pull up to VCC at approximately
300 kΩ
(emitting) (emitting)
(Emitting side)
(Detecting side)
TXD
(7pin)
Internal LED
(Light output)
Light input
RXD
(6pin)
PWDOWN
(5pin)
zNotes
1) VLEDA (8pin) and VCC (3pin)
•Other power source can be used difference between VLEDA and VCC.
2) Caution in designing board lay-out
To get maximum potential from RPM873, please keep in mind follow ing 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 p arts which
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 down current might increase if exposed by strong light (ex. dire ct sunlight) at power dow n mode.
•Please use by the signal format which is specified by lrDA V er1.2 (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.
RPM873
Photo Link Module
Rev.B 6/6
z Dimensions Diagram (Unit : mm)
RSLP8
R1.0
R1.1
0.78 0.76
0.37±0.10
0.95
3.8
1
1
8
LEDPin PD
2
1
2.72
0.8
7.6
5.6
P0.95 × 7=6.65
2.49
Appendix
Appendix1-Rev1.1
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.
Notes
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.
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.
