RPM873
Photo Link Module
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 power consumption. The very small
package makes it a perfect fit for mobile devices.
Features
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 standard.
3) Supply voltage range is from V
CC
=2.0 to 3.6V, VLEDA=2.6 to 5.5V.
4) Surface mounting type.
5) Built-in power down function.
Applications
Cellular phones, PDA, DVC, digital still cameras, printers, handy terminals and etc.
Absolute maximum ratings
(Ta=25°C)
Parameter
Supply voltage
Input voltage
Operation temperature
Storage temperature
Power dissipation
Symbol
V
CC
/VLEDA
Vin(5,6,7pin)
Topr
Tstg
Pd
Limits
7.0
∗
1
−0.3
to V
CC
+0.3
−25
to 85
−30
to 100
100
Unit
V
V
°C
°C
mW
∗
2
∗
1) This applies to all pins on the basis of ground pins (1,4pin).
∗
2) In case of operating environment is over 25
°C
, 1.33mW would be reduced per each 1
°C
stepping up.
Recommended operating conditions
(Ta=25°C)
Parameter
Supply voltage
Symbol
V
CC
VLEDA
Min.
2.0
2.6
Typ.
3.0
3.0
Max.
3.6
5.5
Units
V
V
Rev.B
1/6
RPM873
Photo Link Module
Block diagram and application circuit
AMP
GND
1
2
NC
V
CC
V
CC
AMP
AMP
3
GND
GND
C1
4
POWER
DOWN
PWDOWN
PWDOWN
5
RXD
RXD
6
7
TXD
TXD
LEDA
(LEDV
CC
)
8
V
CC
(3pin) and VLEDA(8pin) can be
used on either common power source
or different one.
Recommended values
Part symbol
C1
Recommended
1µF, tantalum or ceramic
Ex.) TCFGA1A105M8R(ROHM)
Notice
Bigger capacitance is recommended with much noise from power supply.
Rev.B
2/6
RPM873
Photo Link Module
Terminal description
Pin No.
1
2
Terminal
GND
NC
Circuiit
GND
Funciton
This terminal must be left open.
V
CC
3
V
CC
For preventing from infection, connect a capacitor
between
V
CC
(3pin) and GND(4pin).
4
GND
GND
V
CC
5
PWDOWN
Power-down control terminal
H : Power down
L : Operation
CMOS logic level input
When input is H, it will stop the receiving
circuit, PIN−PD current and transmitting
LED operation.
V
CC
PWDOWN
6
RXD
300K
V
CC
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.
V
CC
7
TXD
600k
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
8
LEDA
LED
difference between VLEDA and V
CC
.
This can be connected to battery kinds of unregulated
voltage source by internal constant current driver.
Rev.B
3/6
RPM873
Photo Link Module
Electrical characteristics
(V
CC
=3V, VLEDA=3V, Ta=25°C)
Parameter
Consumption current 1
Consumption current 2
Transmission rate
PWDOWN input high voltage
PWDOWN input low voltage
PWDOWN input high current
PWDOWN input low current
<Transmitter>
TXD input high voltage
TXD input low voltage
TXD input high current
TXD input low current
LED anode current
<Receiver>
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
V
CC
−0.4
0
−
−
1.5
−
−
−
35
35
2.3
100
−
0.4
−
−
4.2
200
V
V
ns
ns
µs
µs
IRXH=
−200µA
IRXL= 200µA
C
L
=15pF
C
L
=15pF
C
L
=15pF,
2.4 to 115.2kbps
VTXH
VTXL
ITXH
ITXL
ILEDA
V
CC
−0.55
0
2.5
−1.0
−
−
−
5
0
30.5
−
0.55
10
1.0
−
V
V
µA
µA
mA
TXD=V
CC
[V]
TXD=0 [V]
VPDH
VPDL
IPDH
IPDL
Symbol
I
CC
1
I
CC
2
Min.
−
−
2.4
V
CC
−0.55
0
−1.0
−1.0
Typ.
75
0.01
−
−
−
0
0
Max.
99
0.2
115.2
−
0.55
1.0
1.0
Unit
µA
µA
kbps
V
V
µA
µA
PWDOWN=V
CC
[V]
PWDOWN=0 [V]
Conditions
Waiting mode, At no input light
PWDOWN mode, At no input light
Optical characteristics
(V
CC
=3V, VLEDA=3V, Ta=25°C)
Parameter
Peak wave length
Intensity 1
Half-angle
Opticcal pulse width
Rise time / Fall time
Optical over shoot
Edge jitter
Minimum irradiance in angular range
Maximum irradiance in angular range
Half-angle
Maximum emitting time
Tj
Eemin
Eemax
θD
/ 2
TLEDmax
Symbol
λP
IE1
θL
/ 2
TWLED
Tr / Tf
Min.
850
4
−
1.42
−
−
−40
−
500
±15
10
Typ.
870
10
±18
1.63
−
−
−
−
−
−
48
Max.
900
26
±30
2.02
100
25
40
6.8
−
−
120
Unit
nm
mW / Sr
˚C
µs
ns
%
ns
µW
/ cm
2
−15° < θ
L
<
15°
− −
mW / cm
2
−15° < θ
L
<
15°
− −
˚C
µs
TXD=V
CC
TXD=1.63µs pulse input
10% to 90%
−15° < θ
L
<
15°
− −
Conditions
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.
Rev.B
4/6
RPM873
Photo Link Module
Timing chart
(Emitting side)
TXD
(7pin)
less than 48
µs
more than 48
µs
(emitting)
(emitting)
(emitting)
Internal LED
(Light output)
approximately 48
µs
(Detecting side)
Light input
less than 2.3
µs
more than 2.3
µs
RXD
(6pin)
approximately 2.3
µs
pull up to V
CC
at approximately
300 kΩ
PWDOWN
(5pin)
Notes
1) VLEDA (8pin) and V
CC
(3pin)
•Other
power source can be used difference between VLEDA and V
CC
.
2) Caution in designing board lay-out
To get maximum potential from RPM873, please keep in mind following 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 parts 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. direct sunlight) at power down mode.
•Please
use by the signal format which is specified by lrDA Ver1.2 (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.
Rev.B
5/6
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