ROHM RPM871 Technical data

RPM871

Photo Link Module

IrDA Infrared communication Module

RPM871

RPM871 is an infrared communication module for IrDA V er . 1.2 (Low Power). The infrared LED, PIN photo diode, LSI are
all integrated into a single package. This module is designed with power dow n 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)

zApplica tions

Cellular phones, PDAs, etc.

zAbsolute maximum ratings (Ta = 25°C)

Parameter Symbol
Power supply voltage V
Power dissipation
Operating temperature range
Storage temperature range
LED peak current

∗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%

CC

Pd
Topr
Tstg

FP

I

Limits

−0.3 to +7.0

∗1

150

−20 to +85

−30 to +100

∗2

200

zRecommended operating conditions (Ta = 25°C)

Parameter Symbol Min. Typ. Max. Unit

V

Power supply voltage

CC

V

LEDA

2.8 V2.6 3.6

2.8 V2.6 5.5

Unit

V

mW

°C
°C

mA

Rev.B 1/7

Photo Link Module

zBlock diagram and application circuit

AMP

GND

18765432

NC

RPM871

AMPAMP

POWER

DOWN

LED

DRIVER

V

CC

GND

C1

PWDOWN

RXD

TXD

LEDA

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

R1

V

CC

GND

PWDOWN

RXD

TXD

(LEDV

CC

)

Rev.B 2/7

Photo Link Module

zT erminal description

Pin No

Terminal

RPM871

Circuit Function

1, 4 GND

2NC

3

5

6

V

CC

PWDOWN

RXD

PWDOWN

GND

This Terminal must be left open.
V

CC

For preventing from infection, connect
a capacitor between V
GND (4pin).

V

CC

V

CC

V

CC

300k

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.

Receiving Data Output Terminal
CMOS Logic Level Output

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

CC

(3pin) and

CC

at

V

CC

7

8

TXD

LEDA

200K

LED

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
LED current depends on LED load
resistance value.

CC

and VCC.

Rev.B 3/7