RPM871 Datasheet by Rohm Semiconductor

RPM871
Photo Link Module
Rev.B 1/7
IrDA Infrared communication Module
RPM871
RPM871 is an infrared communication module for IrDA Ver. 1.2 (Low Power). The infrared LED, PIN photo diode, 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.
zFeatures
1) Applied to IrDA version 1.2. (Low Power)
2) Designed for low power consumption at waiting mode (Typ.73µA).
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 transmission distance. (Approx. 20 to 60cm)
zApplications
Cellular phones, PDAs, etc.
zAbsolute maximum ratings (Ta = 25°C)
Parameter Symbol Limits Unit
Power supply voltage V
CC
−0.3 to +7.0
−20 to +85
−30 to +100
V
mA
mW
200
∗2
150
∗1
Operating temperature range
Storage temperature range
LED peak current
Power dissipation
Topr
Tstg
I
FP
Pd
°C
°C
∗1 70mm×70mm, t=1.6mm, glass epoxy mounting. Derating : 2mW/°C for operation above Ta=25°C
∗2 LED peak current<90µs. ON duty<20%
zRecommended operating conditions (Ta = 25°C)
Parameter Symbol Min. Typ. Max. Unit
Power supply voltage V
CC
2.8 V2.6 3.6
V
LEDA
2.8 V2.6 5.5
RPM871 Photo Link Module OBlock diagram and applicalion circuit LJLJUUT DEM I L_| D
RPM871
Photo Link Module
Rev.B 2/7
zBlock diagram and application circuit
AMP
18765432
AMPAMP
POWER
DOWN
LED
DRIVER
V
CC
V
CC
GND
C1
R1
GND
NC
GND
PWDOWN
RXD
TXD
LEDA
PWDOWN
RXD
TXD
(LEDV
CC
)
V
CC
(3pin) and VLEDA (8pin) can be used on
either common power source or different one.
RPM871
Photo Link Module
Rev.B 3/7
zTerminal description
Terminal Circuit Function
Pin No
1, 4 GND GND
This Terminal must be left open.
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
L : OPERATION
Receiving Data Output Terminal
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
turn off approximately 45µs.
LED ANODE Terminal
Other power source can be used
difference between LEDV
CC
and V
CC
.
LED current depends on LED load
resistance value.
2NC
PWDOWN
RXD
TXD
LEDA
3
5
6
7
8
V
CC
V
CC
For preventing from infection, connect
a capacitor between V
CC
(3pin) and
GND (4pin).
V
CC
VCC
200K
LED
V
CC
V
CC
300k
PWDOWN
RPM871
Photo Link Module
Rev.B 4/7
zElectrical characteristics (Unless otherwise noted, VCC=2.8V, VLEDVCC=2.8V, Ta = 25°C)
Parameter Symbol Min. Typ. Max. Unit Conditions
Consumption current1 I
CC
1
I
CC
2
VPDH
VPDL
IPDH
IPDL
73 µAWaiting mode At no input light
PWDOWN PIN High At no input light
PWDOWN=V
CC
[V]
Consumption current2
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
−
−
−
2.4
−
−
V
CC
−0.55
99
µA
0.2
kbps115.2
V
V
−
0.55
<Transmitter>
<Receiver>
VTXH
VTXL
ITXH
ITXL
ILEDA
VRXH
VRXL
tRR
tFR
tRT
twRXD
PWDOWN=0 [V]
TXD=V
CC
[V]
TXD=0 [V]
R1=7.5 [Ω]
0
−1.0
V
CC
−0.55
−
7
−1.0
−
−
−
−
1.5
−
V
CC
−0.5
0
−1.0
−
−
14
0
144
−
−
70
30
2.3
100
µA
1.0
µA
1.0
V
V
µA
µA
mA
V
V
ns
ns
µs
µs
−
0.55
28
1.0
−
−
0.4
−
−
3.6
300
IRXH=−50µA
IRXL=200µA
C
L
=15pF
C
L
=15pF
C
L
=15pF, 2.4 to 115.2kbps
zOptical characteristics (Unless otherwise noted, VCC=2.8V, VLEDVCC=2.8V, Ta = 25°C)
Parameter Symbol Min. Typ. Max. Unit Conditions
Peak wave length
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.
λP
IE1
θL/2
θD/2
TLEDmax
Tr/Tf
Tj
Eemax
870 nm
−15°≤θ
L
≤15°
R1=7.5 [Ω]
−15deg ≤ θ
L
≤ +15deg
TXD=V
CC
10% to 90%
Intensity1
Half-angle
Rise time / Fall time
Optical over shoot
Edge jitter
Maximum irradiance
INPUT Half-Angular
Maximum emitting time
850
3614.4
−
±18
−
−
900
mW/Sr93.6
mW/cm
2
deg
ns
deg
µs
±30
100
−−
−
−
−
45
−40
500
±15
10
%25
ns40
−
Eemin −15deg ≤ θ
L
≤ +15deg
Minimum irradiance µW/cm
2
−
−6.8
−
96
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RPM871
Photo Link Module
Rev.B 5/7
zTiming chart
less than 45µs
(emitting)
more than 45µs
approximately 45µs
less than 2.3µs more than 2.3µs
approximately 2.3µsapproximately 2.3µs
pull up to VCC at approximately 300kΩ
(emitting) (emitting)
(Emitting side)
(Detecting side)
TXD
(7pin)
Internal LED
(Light output)
Light input
RXD
(6pin)
PWDOWN
(5pin)
zAttached components
Recommended values
Part symbol
C1
Recommended value Notice
1µF, tantalum or ceramic
Ex.) TCFGA1A105M8R (ROHM) Bigger capacitance is recommended with much noise from power supply
R1 7.5Ω±5%, 1/4W
(VLEDV
CC
=2.8V)
More than 60cm distance, more than 4[µW/cm
2
] at detecting side.
(vs ver1.0)
More than 46cm distance, more than 6.8[µW/cm
2
] at detecting side.
(vs RPM871)
In case of using R1 with different condition from the above, formula is as follows :
LED resistance value : R1[Ω], LED average consumption current : ILED[mA], Supply voltage : VLEDVCC[V],
Link distance : d[cm] (Including LED’s distribution within ±15deg)
R1=T × (VLEDVCC−1.45) / d2−3.5 [Ω]
ILED=Duty × (VLEDVCC−1.36) / (R1+2.5) [A]
Duty : LED duty at emitting
T : 17300 (vs. RPM871), 29400 (vs. ver1.0)
∗ Please set up to be ILED / Duty < 200[mA] (Duty < 20%)
MAX MAX 02D D Zn on an an m a 2b a gun on an an m AME‘ENT Tswanmuns um AME‘ENT Tswanmuns um
RPM871
Photo Link Module
Rev.B 6/7
zNotes
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, please keep in mind following instruction.
• The line of RXD (6pin) should be connected at backside via through hole close to RPM871 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.
• 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 < 90µsec. 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 (70×70×1.6mm) mounted.
−200 2040608010
AMBIENT TEMPERATURE : Ta
(°C)
0
MAXIMUM LED PACK CURRENT : Iledp (mA)
50
100
150
200
250
0
Duty=10%
Duty=20%
b) RPM871
−200 2040608010
AMBIENT TEMPERATURE : Ta
(°C)
0
MAXIMUM LED PACK CURRENT : Iledp (mA)
50
100
150
200
250
0
Duty=10%
Duty=20%
L HS
RPM871
Photo Link Module
Rev.B 7/7
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.