ROHM RPM872 Technical data

RPM872

Photo Link Module

IrDA infrared communication module

RPM872

RPM872 is an infrared communication module for IrDA V er. 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.

zFeatures

1) Applied to IrDA Ver. 1.2. (Low Power)

2) Designed for low power consumption at waiting mode (75µA).

3) Low operating voltage
V

=2.0V to 3.6V

CC

VIO=1.5V to 3.6V
VLED=2.6V to 5.5V

4) Small package.

5) Power down function.

zApplica tions

Cellular phones, PDA, Digital still camera, Handy terminals, and other portable equipments.

zAbsolute maximum ratings (Ta=25°C)

Parameter Symbol

Supply voltage
Power dissipation
Operating temperature
Storage temperature

CC

V

Pd
Topr
Tstg

Limits

−20 to +85

−30 to +100

zRecommended operating conditions (Ta = 25°C)

Parameter Symbol Min. Typ. Max. Unit

V

Supply voltage

CC

VLEDA

VIO

3.0 V2.0 3.6

3.0 V2.6 5.5

3.0 V1.5 V

7.0

CC

Unit

V

mW100

˚C
˚C

Rev.B 1/6

Photo Link Module

zBlock diagram and application circuit

AMP

GND

18765432

VIO

RPM872

VIO

AMPAMP

POWER

DOWN

CC

V

GND

C1

PWDOWN

RXD

TXD

LEDA

VCC(3pin) and VLEDA(8pin) can be used on
either common power source or different one.

V

CC

GND

PWDOWN

RXD

TXD

(LEDV

CC

)

Rev.B 2/6

Photo Link Module

zT erminal description

Pin No

Terminal Circuit

RPM872

Function

1, 4 GND

2 VIO

3

5

6

CC

V

PWDOWN

RXD

PWDOWN

VIO

VIO

300k

VIO

GND

VIO
Supply voltage for I/O pins (PWDOWN,
RXD, TXD)

V

CC

Supply voltage for Transceiver circuits.
For preventing from infection,
connect a capacitor between

CC

(3pin) and GND(4pin).

V

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.

Receiving Data Output Terminal
CMOS logic level output

When PWDOWN (5pin) = H, the RXD
output will be pulled up to
VIO at approximately 300kΩ.

VIO

7

8

TXD

LEDA

600k

LED

Transmitting Data Input Terminal
H : LED (PWDOWN = L)

CMOS logic level input
Holding TXD = "H"status, LED will
be turn off approximately 48µs.

LED ANODE Terminal
Other power source can be used

difference between LEDV
This can be connected to battery kinds
of unregulated voltage source by internal
constant current driver.

CC

and VCC.

Rev.B 3/6