RPM872
Photo Link Module
Rev.B 1/6
IrDA infrared communication module
RPM872
RPM872 is an infrared communication module for IrDA Ver . 1.2 (Low Power). The infrared LED, PIN photo diode, and
waveform shaping LSI are all integrated into one single p ackage. This module is designed for low power consumption.
The very small package makes it a perfect fit for mobile devices.
zFeatures
1) Applied to IrDA Ver . 1.2. (Low Power)
2) Designed for low pow er consumption at waiting mode (75µA).
3) Low operating volt age
VCC=2.0V to 3.6V
VIO=1.5V to 3.6V
VLED=2.6V to 5.5V
4) Small package.
5) Power dow n function.
zA pplications
Cellular phones, PDA, Digital still camera, Handy terminals, and other portable equipments.
zA bsolute maximum ratings (Ta=25°C)
Power dissipation
Supply voltage
Operating temperature
Storage temperature
Parameter Symbol Limits Unit
V
CC
7.0
−20 to +85
−30 to +100
V
mW100
Topr
Tstg
Pd
˚C
˚C
zRecommended operating conditions (Ta = 25°C)
Supply voltage
Parameter Symbol Min. Typ. Max. Unit
V
CC
3.0 V2.0 3.6
VLEDA
VIO
3.0 V2.6 5.5
3.0 V1.5 V
CC
RPM872
Photo Link Module
Rev.B 2/6
zBlock diagram and applica tion circuit
AMP
18765432
AMPAMP
POWER
DOWN
V
CC
VIO
V
CC
V
CC
(3pin) and VLEDA(8pin) can be used on
either common power source or different one.
GND
C1
GND
VIO
GND
PWDOWN
RXD
TXD
LEDA
PWDOWN
RXD
TXD
(LEDV
CC
)
RPM872
Photo Link Module
Rev.B 3/6
zTerminal description
Function
Pin No
1, 4 GND GND
VIO
Supply voltage for I/O pins (PWDOWN,
RXD, TXD)
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 : POWERDOWN MODE
L : OPERATING MODE
2 VIO
PWDOWN
RXD
TXD
LEDA
3
5
6
7
8
V
CC
VIO
VIO
600k
LED
VIO
VIO
PWDOWN
300k
V
CC
Supply voltage for Transceiver circuits.
For preventing from infection,
connect a capacitor between
VCC(3pin) and GND(4pin).
Receiving Data Output Terminal
CMOS logic level output
When PWDOWN (5pin) = H, the RXD
output will be pulled up to
VIO at approximately 300kΩ.
Transmitting Data Input Terminal
H : LED (PWDOWN = L)
CMOS logic level input
Holding TXD = "H"status, LED will
be turn off approximately 48µs.
LED ANODE Terminal
Other power source can be used
difference between LEDVCC and VCC.
This can be connected to battery kinds
of unregulated voltage source by internal
constant current driver.
Terminal Circuit
RPM872
Photo Link Module
Rev.B 4/6
zElectrical characteristics (Unless otherwise noted, VCC=3V, VLEDA=3V, VIO=3V, Ta=25°C)
PWDOWN INPUT High Voltage
PWDOWN INPUT High Current
PWDOWN INPUT Low Voltage
PWDOWN INPUT Low Current
Consumption Current 1
Parameter Symbol Min. Typ. Max. Unit Conditions
I
CC
1
I
CC
2
VPDH
VPDL
IPDH
IPDL
75 µAVPWDOWN
=
0V. At no input light
VPWDOWN
=
VIO. At no input light
PWDOWN
=
VIO [V]
VIO
=
1.8 to 3.6 [V]
VIO
=
1.5 to 1.8 [V]
VIO
=
1.8 to 3.6 [V]
VIO
=
1.5 to 1.8 [V]
−
0.01
−
0
−
2.4
−
−
2/3∗VIO
1.2
2/3∗VIO
1.2
1/3∗VIO
VIO−1.2
1/3∗VIO
VIO−1.2
99
µA
0.2
kbps115.2
V
V
VIO
<Transmitter>
<Receiver>
VTXH
VTXL
ITXH
ITXL
ILEDA
VRXH
VRXL
tRR
tFR
tRT
twRXD
PWDOWN
=
0 [V]
TXD
=
VIO [V]
TXD
=
0 [V]
0−1.0
0
2.5
−1.0
−
0
−
−
1.5
−
VIO−0.4
0−1.0
−
−
5
0
30.5
−
−
35
35
2.3
100
µA
1.0
µA
1.0
V
V
µA
µA
mA
V
V
ns
ns
µs
µs
VIO
10
1.0
−
VIO
0.4
−
−
4.2
200
IRXH
=
−200µA
IRXL
=
200µA
C
L
=
15pF
C
L
=
15pF
C
L
=
15pF, 2.4 to 115.2kbps
VIO
=
1.8 to 3.6 [V]
VIO
=
1.5 to 1.8 [V]
VIO
=
1.8 to 3.6 [V]
VIO
=
1.5 to 1.8 [V]
Consumption Current 2
Transmission rate
TXD INPUT High Voltage
TXD INPUT High Current
TXD INPUT Low Voltage
TXD INPUT Low Current
LED ANODE Current
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 (Unless otherwise noted, V CC=3V, VLEDA=3V, VIO=3V, Ta=25°C)
1.This product is not designed for protection against radioactive rays.
2.This product dose not include laser transmitter.
3.This product includes one pin photo diode.
4.This product dose not include optical load.
Parameter Symbol Min. Typ. Max. Unit Conditions
λP
IE1
θL / 2
θD / 2
TLEDmax
Tr / Tf
Tj
Eemax
870 nm
−15˚ ≤ θL ≤ 15˚
−15deg ≤ θL ≤ +15deg
TXD=VIO
10% to 90%
850
104.0
−
±18
−
−
900
mW / Sr26
TWLED TXD=1.63µs pulse input
1.631.42 µs
2.02
mW / cm
2
deg
ns
deg
µs
±30
100
−−
−
−
−
48
−40
500
±15
16
%25
ns40
−
−
120
Peak wave length
Intensity 1
Half-Angle
Rise time / Fall time
Optical over shoot
Optical pulse width
Edge jitter
Maximum irradiance
Eemin −15deg ≤ θL ≤ +15deg
µW / cm
2
−− 6.8
Minimum irradiance
INPUT Half-Angular
Maximum Emitting Time
RPM872
Photo Link Module
Rev.B 5/6
zTiming chart
more than 48 µs
approximately 48 µs
less than 2.3 µs more than 2.3 µs
approximately 2.3 µsapproximately 2.3 µs
pull up to VIO at
approximately 300kΩ
(Emitting side)
(Detecting side)
TXD
(7pin)
Internal LED
(Light output)
Light input
RXD
(6pin)
PWDOWN
(5pin)
less than 48 µs
(emitting) (emitting) (emitting)
zRecommended values
Part symbol
C1
Recommended value Notice
1µF, tantalum or ceramic
Ex.) TCFGA1A105M8R (ROHM) Bigger capacitance is recommended with much noise from power supply
RPM872
Photo Link Module
Rev.B 6/6
zNotes
1) VLEDA(8pin), VCC(3pin) and VIO(2pin)
• Other power source can be us ed difference between VLEDA and VCC and VIO. (VIO < VCC +0.3V)
2) Caution in designing board lay-out
To get maximum potential from RPM872, please keep in mind follow ing instruction.
• The line of RXD (6pin) should be connected at backside via through hole close to RPM872 pin lead. Better not
to be close to photo diode side (1pin).
⇒This is to minimize feedback supplied to photo diode from RXD.
• As for C1 between 3-4 pin should be placed close to RPM872.
• Better to be placed more than 1.0cm in radius from photo diode (pin1 side) and also aw ay from the p arts which
generates noise, such as DC / DC converter .
3) Others
• Please be sure to set up the TXD (7pin) input to be “L” (under 0.3V) except transmitting data
(for < 90µs. On duty < 20%).
• Powe rdown current might increase if exposed by strong light (ex. dire ct sunlight) at powerdow n mode.
• Please use by the signal format w hich is specified by IrDA V er1.2 (Low Powe r). There might be on error if used by
different signal format.
• Dust or dirt on lens portion may af fect the characteristics, so pay sufficient attention.
4) Eye Safe
• IEC825-1 (EN60825-1) Class 1 Eye Safe.
zExternal dimensions (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.
