ROHM RPM873 Technical data

RPM873

Photo Link Module

IrDA Infrared Communication Module

RPM873

RPM873 is an infrared communication module for IrDA V er. 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 pow er consumption. The very small
package makes it a perfect fit for mobile devices.

zFeatures

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 pow er standard.

3) Supply voltage range is from V

4) Surface mounting type.

5) Built-in power down function.

zApplica tions

Cellular phones, PDA, DVC, digital still cameras, printers, handy terminals and etc.

zAbsolute maximum ratings (Ta=25°C)

Parameter Symbol Limits Unit
Supply voltage V
Input voltage
Operation temperature
Storage temperature
Power dissipation

1) This applies to all pins on the basis of ground pins (1,4pin).

∗

2) In case of operating environment is over 25 , 1.33mW would be reduced per each 1 stepping up.

∗

zRecommended operating conditions (Ta=25°C)

Parameter

Supply voltage

Symbol Min. Typ. Max. Units

V

VLEDA 3.0 V2.6 5.5

Rev.B 1/6

CC=2.0 to 3.6V , VLEDA=2.6 to 5.5V.

CC

/VLEDA 7.0

Vin(5,6,7pin)

Topr
Tstg

Pd

CC

−0.3 to V

−25 to 85

−30 to 100

100

3.0 V2.0 3.6

1

∗

CC

+0.3

2

∗

V
V

°C
°C

mW

°C °C

Photo Link Module

zBlock diagram and application circuit

AMP

GND

18765432

NC

RPM873

AMPAMP

POWER

DOWN

V

CC

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

)

zRecommended values

Part symbol

C1

1µF, tantalum or ceramic

Ex.) TCFGA1A105M8R(ROHM)

Recommended Notice

Bigger capacitance is recommended with much noise from power supply.

Rev.B 2/6

Photo Link Module

zT erminal description

Pin No.

Terminal Circuiit Funciton

RPM873

1 GND

2NC

CC

V

3

GND

4

5

PWDOWN

6

RXD

PWDOWN

GND

This terminal must be left open.

V

CC

For preventing from infection, connect a capacitor

V

CC

between

GND

V

CC

V

CC

V

300K

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.

CC

Receiving data output teminal
CMOS logic level output
When PWDOWN (5pin) = H, the RXD output will
be pulled up to V

(3pin) and GND(4pin).

CC

at approximately 300kΩ.

V

CC

7

TXD

600k

8

LEDA

LED

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

difference between VLEDA and V

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

CC.

Rev.B 3/6