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RPM871-H14
Photo Link Module
IrDA Infrared communication Module
RPM871-H14
RPM871-H14 is an infrared communication module for IrDA Ver. 1.2 (Low Power). The infrared LED, PIN photo diode, waveform shaping LSI are all integrated into a single package. This module is designed with power down function and low current consumption at stand-by mode. The ultra small package makes it a perfect fit for mobile devices.
Features 1) Applied to IrDA version 1.2. (Low Power) 2) Designed for low power consumption at stand-by for receiving (Typ.73A). 3) Suitable for sets driven by battery due to power down control function. 4) Power supply voltage range : 2.6V to 3.6V 5) Constant LED load resistance can change communication range. (Approx. 20 to 60cm)
Applications Cellular phones, PDAs, etc.
Absolute maximum ratings (Ta = 25C)
Parameter Power supply voltage
Input voltage
Symbol VCC Vin Pd Topr Tstg IFP
Limits 7.0
-0.3 to VCC+0.3
Unit V V mW C C mA
Power dissipation Operating temperature range Storage temperature range LED peak current
1501 -20 to +85 -30 to +100 2002
1 70mmx70mm, t=1.6mm, glass epoxy mounting. Derating : 2mW/C for operation above Ta=25C 2 LED peak current<90s. ON duty<20%
Recommended operating conditions (Ta = 25C)
Parameter Power supply voltage Symbol VCC VLEDA Min. 2.6 2.6 Typ. 3.0 2.8 Max. 3.6 5.5 Unit V V
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RPM871-H14
Photo Link Module
Block diagram and application circuit
AMP
GND
1 2
NC
AMP
VCC VCC
3
AMP
GND
4
GND C1
POWER DOWN
PWDOWN PWDOWN
5
6
RXD
RXD
7
TXD TXD R1 (LEDVCC)
LEDA
8
LED DRIVER
VCC (3pin) and VLEDA (8pin) can be used on either common power source or different one.
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RPM871-H14
Photo Link Module
Terminal description
Pin No 1, 4 2
Terminal
GND NC
Circuit
Function
GND Pin1 and pin4 must be connected to the ground. This Terminal must be left open. VCC For preventing from infection, connect a capacitor between VCC (3pin) and GND (4pin).
3
VCC
VCC
5
PWDOWN
Power-down Control Terminal H : POWERDOWN L : OPERATION CMOS Logic Level Input When input is H, it will stop the receiving circuit, Pin-PD current and transmitting LED operation.
VCC PWDOWN VCC 300k
6
RXD
Receiving Data Output Terminal CMOS Logic Level Output When PWDOWN (5pin)=H, the RXD output will be pulled up to VCC at approximately 300k.
VCC
7
TXD
200K
Transmitting Data Input Terminal H : LED (PWDOWN=L) CMOS Logic Level Input Holding TXD="H" status, LED will be turn off approximately 45s.
8
LEDA
LED
LED ANODE Terminal Other power source can be used difference between LEDVCC and VCC. LED current depends on LED load resistance value.
-
Shield Case
Connect to Ground.
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RPM871-H14
Photo Link Module
Electrical characteristics (Unless otherwise noted, VCC=2.8V, VLEDVCC=2.8V, Ta=25C)
Parameter Consumption current1 Consumption current2 Transmission rate PWDOWN INPUT High voltage PWDOWN INPUT Low voltage PWDOWN INPUT High current PWDOWN INPUT Low current

Symbol ICC1 ICC2
Min. - - 2.4
Typ. 73 0.01 - - -
0 0 - - 14 0 144 - - 70 30 2.3 100
Max. 99 0.2 115.2 - 0.55
1.0 1.0 - 0.55 28 1.0 - - 0.4 - - 3.6 300
Unit A A kbps V V
A A
Conditions Stand-by for receiving At no input light PWDOWN PIN High At no input light
VPDH VPDL IPDH IPDL
VCC-0.55 -
-1.0 -1.0
PWDOWN=VCC [V]
PWDOWN=0 [V]
TXD INPUT High voltage TXD INPUT Low voltage TXD INPUT High current TXD INPUT Low current LED ANODE current

VTXH VTXL ITXH ITXL ILEDA
VCC-0.55 - 7 -1.0 -
V V A A mA TXD=VCC [V] TXD=0 [V] R1=7.5 [] IRXH= -50A IRXL=200A CL=15pF CL=15pF CL=15pF, 2.4 to 115.2kbps
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
VCC-0.5 - - - 1.5 -
V V ns ns s s
Optical characteristics (Unless otherwise noted, VCC=2.8V, VLEDVCC=2.8V, Ta = 25C)
Parameter Peak wave length Intensity1 Half-angle Rise time / Fall time Optical over shoot Edge jitter Irradiance in angular INPUT Half-Angular Maximum emitting time Tj Ee D/2 TLEDmax Symbol P IE1 L/2 Tr/Tf Min. 850 14.4 - - - -40 0.0068 15 10 Typ. 870 36 18 - - - - - 45 Max. 900 93.6 30 100 25 40 500 - 96 Unit nm mW/Sr deg ns % ns mW/cm2 -15L15 deg s TXD=VCC 10% to 90% -15L15 R1=7.5 [] Conditions
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.
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RPM871-H14
Photo Link Module
Timing chart
(Emitting side) TXD (7pin)
less than 45s
more than 45s
(emitting)
(emitting)
(emitting)
Internal LED (Light output)
approximately 45s
(Detecting side) Light input
less than 2.3s
more than 2.3s
RXD (6pin)
pull up to VCC at approximately 300k approximately 2.3s approximately 2.3s
PWDOWN (5pin)
Attached components 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 More than 60cm distance, more than 4[W/cm2] at detecting side. (vs ver1.0) More than 46cm distance, more than 6.8[W/cm2] at detecting side. (vs RPM871-H14)
R1
7.55%, 1/4W (VLEDVCC=2.8V)
In case of using R1 with different condition from the above, formula is as follows : LED resistance value : R1[], LED average consumption current : ILED[mA], Supply voltage : VLEDVCC[V], Link distance : d[cm] (Including LED's distribution within 15deg) R1=T x (VLEDVCC-1.45) / d2-3.5 [] ILED=Duty x (VLEDVCC-1.36) / (R1+2.5) [A] Duty : LED duty at emitting T : 17300 (vs. RPM871-H14), 29400 (vs. ver1.0) Please set up to be ILED / Duty < 200[mA] (Duty < 20%)
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RPM871-H14
Photo Link Module
Notes 1) LEDVCC (8pin) and VCC (3pin) * Other power source can be used difference between LEDVCC and VCC. 2) Caution in designing board lay-out To get maximum potential from RPM871-H14, please keep in mind following instruction. * The line of RXD (6pin) should be connected at backside via through hole close to RPM871-H14 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 RPM871-H14. * 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 0.55V) except transmitting data (for < 90sec. on duty < 20%). * Power down current might increase if exposed by strong light (ex. direct sunlight) at power down mode. * Please use by the signal format which is specified by IrDA Ver1.2 (2.4k to 115.2kbps). 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) LED current derating and ambient temperature The relation between LED peak current and maximum ambient temperature is shown below. We recommend you to use within the range as indicated in below. a) When glass-epoxy board (70x70x1.6mm) mounted.
MAXIMUM LED PACK CURRENT : Iledp (mA)
250
Duty=10%
200
150
Duty=20%
100
50
0 -20
0
20
40
60
80
100
AMBIENT TEMPERATURE : Ta (C)
b) RPM871-H14
MAXIMUM LED PACK CURRENT : Iledp (mA)
250
Duty=10%
200
150
Duty=20%
100
50
0 -20
0
20
40
60
80
100
AMBIENT TEMPERATURE : Ta (C)
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RPM871-H14
Photo Link Module
External dimensions (Unit : mm)
R1.1
8.0
R1.0
2.2
2.2
PinPD 1.1 1.4 2.8 4.0 A
1.0
LED 0.78
0.150.1
0.150.1 0.76 2.59
2.67
2.9
A Part Size (Shield Case underside size)
0.75
1 0.370.1 0.95 P0.95x7=6.65 0.6
0.680.1
8
2.2
0.48
0.60.1
(0.13)
NOTE 1.TOLERANCE : 0.2mm 2.COPLANARITY : 0.1mmMAX UNIT : mm
ETH648
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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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