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 (75µA).
3) Low operating voltage
V
CC
=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=25°C)
Parameter
Supply voltage
Power dissipation
Operating temperature
Storage temperature
Symbol
V
CC
Pd
Topr
Tstg
Limits
7.0
100
−20
to
+85
−30
to
+100
Unit
V
mW
˚C
˚C
Recommended operating conditions
(Ta = 25°C)
Parameter
Supply voltage
Symbol
V
CC
VLEDA
VIO
Min.
2.0
2.6
1.5
Typ.
3.0
3.0
3.0
Max.
3.6
5.5
V
CC
Unit
V
V
V
Rev.B
1/6
RPM872
Photo Link Module
Block diagram and application circuit
AMP
GND
1
VIO
VIO
AMP
2
V
CC
V
CC
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.
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
V
CC
V
CC
Supply voltage for Transceiver circuits.
For preventing from infection,
connect a capacitor between
V
CC
(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 300kΩ.
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 48µs.
LED ANODE Terminal
LED
8
LEDA
Other power source can be used
difference between LEDV
CC
and V
CC
.
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, V
CC
=3V, VLEDA=3V, VIO=3V, Ta=25°C)
Parameter
Consumption Current 1
Consumption Current 2
Transmission rate
Symbol
I
CC
1
I
CC
2
Min.
−
−
2.4
Typ.
75
0.01
−
−
−
0
0
Max.
99
0.2
115.2
VIO
Unit
µA
µA
kbps
V
Conditions
VPWDOWN = 0V. At no input light
VPWDOWN = VIO. At no input light
PWDOWN INPUT High Voltage
VPDH
2/3∗VIO
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
1/3∗VIO
VIO−1.2
1.0
1.0
V
µA
µA
<Transmitter>
TXD INPUT High Voltage
VTXH
2/3∗VIO
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
1/3∗VIO
VIO−1.2
10
1.0
−
V
µA
µA
mA
TXD = VIO [V]
TXD = 0 [V]
<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
VIO−0.4
0
−
−
1.5
−
VIO
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
Optical characteristics
(Unless otherwise noted, V
CC
=3V, VLEDA=3V, VIO=3V, Ta=25°C)
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
λP
IE1
θL
/ 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˚ ≤ θ
L
≤
15˚
deg
µs
ns
TXD=1.63µs pulse input
10% to 90%
−
Tj
−
−
25
40
%
ns
−40
Eemin
Eemax
θD
/ 2
TLEDmax
−
500
±15
16
−
−
−
48
6.8
−
−
120
µW
/ cm
2
−15deg ≤ θ
L
≤ +15deg
mW / cm
2
−15deg ≤ θ
L
≤ +15deg
deg
µs
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
µs
(emitting)
more than 48
µs
(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)
pull up to VIO at
approximately 300kΩ
approximately 2.3
µs
approximately 2.3
µs
PWDOWN
(5pin)
Recommended values
Part symbol
C1
Recommended value
1µF, tantalum or ceramic
Ex.) TCFGA1A105M8R (ROHM)
Notice
Bigger capacitance is recommended with much noise from power supply
Rev.B
5/6
微控制器 MCU
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