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RPM872
Photo Link Module
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 package. This module is designed for low power consumption. The very small package makes it a perfect fit for mobile devices.
Features 1) Applied to IrDA Ver. 1.2. (Low Power) 2) Designed for low power consumption at waiting mode (75A). 3) Low operating voltage VCC=2.0V to 3.6V VIO=1.5V to 3.6V VLED=2.6V to 5.5V 4) Small package. 5) Power down function.
Applications Cellular phones, PDA, Digital still camera, Handy terminals, and other portable equipments.
Absolute maximum ratings (Ta=25C)
Parameter
Supply voltage Power dissipation Operating temperature Storage temperature
Symbol VCC Pd Topr Tstg
Limits 7.0 100 -20 to +85 -30 to +100
Unit V mW C C
Recommended operating conditions (Ta = 25C)
Parameter
Supply voltage
Symbol VCC VLEDA VIO
Min. 2.0 2.6 1.5
Typ. 3.0 3.0 3.0
Max. 3.6 5.5 VCC
Unit V V V
Rev.B
1/6
RPM872
Photo Link Module
Block diagram and application circuit
AMP
GND
1
VIO
VIO
AMP
2
VCC VCC
AMP
3
GND
GND C1
4
POWER DOWN PWDOWN
PWDOWN
5
RXD
RXD
6 7
TXD TXD
LEDA
(LEDVCC)
8
VCC(3pin) and VLEDA(8pin) can be used on either common power source or different one.
Rev.B
2/6
RPM872
Photo Link Module
Terminal description
Pin No 1, 4
Terminal
GND
Circuit
Function
GND
2
VIO
VIO Supply voltage for I/O pins (PWDOWN, RXD, TXD)
3
VCC
VCC Supply voltage for Transceiver circuits. For preventing from infection, connect a capacitor between VCC(3pin) and GND(4pin).
VIO
5
PWDOWN
Power-down Control Terminal H : POWERDOWN MODE L : OPERATING MODE CMOS logic level input When input is H, it will stop the receiving circuit, Pin-PD current and transmitting LED operation.
VIO PWDOWN VIO
300k
Receiving Data Output Terminal CMOS logic level output When PWDOWN (5pin) = H, the RXD output will be pulled up to VIO at approximately 300k.
6
RXD
VIO
Transmitting Data Input Terminal
7 TXD
600k
H : LED (PWDOWN = L) CMOS logic level input Holding TXD = "H"status, LED will be turn off approximately 48s.
LED ANODE Terminal
LED
8
LEDA
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.
Rev.B
3/6
RPM872
Photo Link Module
Electrical characteristics (Unless otherwise noted, VCC=3V, VLEDA=3V, VIO=3V, Ta=25C)
Parameter
Consumption Current 1
Consumption Current 2 Transmission rate
Symbol ICC1 ICC2
Min. - - 2.4
Typ. 75 0.01 - - -
0 0
Max. 99 0.2 115.2
VIO
Unit A A kbps V
Conditions VPWDOWN = 0V. At no input light VPWDOWN = VIO. At no input light
PWDOWN INPUT High Voltage
VPDH
2/3VIO 1.2 0
-1.0 -1.0
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] PWDOWN = VIO [V]
PWDOWN = 0 [V]
PWDOWN INPUT Low Voltage PWDOWN INPUT High Current PWDOWN INPUT Low Current
VPDL IPDH IPDL
1/3VIO VIO-1.2
1.0 1.0
V
A A

TXD INPUT High Voltage
VTXH
2/3VIO 1.2
0 2.5 -1.0 -
- - 5 0 30.5 - - 35 35 2.3 100
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]
TXD INPUT Low Voltage TXD INPUT High Current TXD INPUT Low Current LED ANODE Current
VTXL ITXH ITXL ILEDA
1/3VIO VIO-1.2
10 1.0 -
V A A mA
TXD = VIO [V] TXD = 0 [V]

RXD OUTPUT High Voltage RXD OUTPUT Low Voltage RXD OUTPUT Rise Time RXD OUTPUT Fall Time RXD OUTPUT Pulse Width Receiver Latency Time
VRXH VRXL tRR tFR twRXD tRT
VIO-0.4 0 - - 1.5 -
VIO 0.4 - - 4.2 200
V V ns ns s s
IRXH = -200A IRXL = 200A CL = 15pF CL = 15pF CL = 15pF, 2.4 to 115.2kbps
Optical characteristics (Unless otherwise noted, VCC=3V, VLEDA=3V, VIO=3V, Ta=25C)
Parameter
Peak wave length Intensity 1 Half-Angle Optical pulse width Rise time / Fall time Optical over shoot Edge jitter Minimum irradiance Maximum irradiance INPUT Half-Angular Maximum Emitting Time
Symbol P IE1 L / 2 TWLED Tr / Tf
Min. 850 4.0 - 1.42 -
Typ. 870 10 18 1.63 -
Max. 900 26 30 2.02 100
Unit nm
Conditions
mW / Sr -15 L 15 deg s ns TXD=1.63s pulse input 10% to 90%
-
Tj
- -
25 40
% ns
-40
Eemin
Eemax D / 2 TLEDmax
-
500 15 16
-
- - 48
6.8
- - 120
W / cm2 -15deg L +15deg
mW / cm2 -15deg L +15deg deg s TXD=VIO
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.
Rev.B
4/6
RPM872
Photo Link Module
Timing chart
(Emitting side)
TXD (7pin)
less than 48 s (emitting)
more than 48 s
(emitting) (emitting)
Internal LED (Light output)
approximately 48 s
(Detecting side)
Light input
less than 2.3 s
more than 2.3 s
RXD (6pin)
pull up to VIO at approximately 300k approximately 2.3 s approximately 2.3 s
PWDOWN (5pin)
Recommended values
Part symbol C1 Recommended value 1F, tantalum or ceramic Ex.) TCFGA1A105M8R (ROHM) Notice
Bigger capacitance is recommended with much noise from power supply
Rev.B
5/6
RPM872
Photo Link Module
Notes 1) VLEDA(8pin), VCC(3pin) and VIO(2pin) * Other power source can be used 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 following 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 away from the parts 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 < 90s. On duty < 20%). * Powerdown current might increase if exposed by strong light (ex. direct sunlight) at powerdown mode. * Please use by the signal format which is specified by IrDA Ver1.2 (Low Power). There might be on error if used by different signal format. * Dust or dirt on lens portion may affect the characteristics, so pay sufficient attention. 4) Eye Safe * IEC825-1 (EN60825-1) Class 1 Eye Safe.
External dimensions (Unit : mm)
1 7.6 R1.1 3.8 5.6 R1.0
2
Pin PD
LED 0.78 0.76
2.72
1
1
0.370.10 0.95 P0.95 x 7=6.65
8
RSLP8
0.8
2.49
Rev.B
6/6
Appendix
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.
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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