ROHM RPM872-H12 Technical data

RPM872-H12

Photo Link Module

IrDA Infrared communication Module

RPM872-H12

RPM872-H12 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) Infrared LED, PIN photo diode, LED driv er & Receiv er freq uency form ation circ uit built in. Impr ovement of EMI noise
protection because of Shield Case.

2) Applied to SIR (2.4 to 115.2kbps)

3) Surface mount type.

4) Power down function built in.

5) Low voltage operation as 1.5V of interface terminals to controller (TXD, RXD, Power down).

zApplica tions

Mobile phone, PDA, DVC, Digital Still Camera, Printer, Handy T erminal etc.

zAbsolute maximum ratings (Ta=25°C)

Parameter Symbol

V

in

(5, 6, 7pin)

Topr
Tstg

Pd

max

Supply voltage V
Input voltage
Operation temperature
Storage temperature
Power dissipation

∗1 This applies to all pins basis ground pins (1.4pin)
∗2 In case operating environment is over 25°C, 1.33mW would be reduced per each 1°C stepping up.

Limits

∗1

7.0

IO

+0.3

−30 to +85

−30 to +100

∗2

100

zRecommended operating conditions (Ta=25°C)

Parameter Symbol Min. Typ. Max. Unit

Supply voltage

V

V

LEDA

V

CC

IO

3.0 V2.0 3.6

3.0 V2.6 5.5

3.0 V1.5 V

CC

Unit

V
V−0.3 to V

°C
°C

mW

Rev.A 1/6

Photo Link Module

zBlock diagram and application circuit

AMP

GND

18765432

V

IO

RPM872-H12

V

IO

AMP

AMP

POWER

DOWN

V

CC

+

GND

C1

PWDOWN

RXD

TXD

LEDA

VCC (3pin) and V
either common power source or different one

LEDA

(8pin) can be used on

V

CC

GND

PWDOWN

RXD

TXD

(LEDV

CC

)

Rev.A 2/6

Photo Link Module

zT erminal description

Pin No

1, 4 GND

Terminal

2V

3

5

IO

V

CC

PWDOWN

RPM872-H12

Circuit Function

GND

Pin1 and Pin4 must be connected
to the ground.

IO

V

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

V

CC

Supply voltage for Transceiver circuits.
For preventing from infection, connect
a capacitor between V
GND (4pin).

V

IO

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.

CC

(3pin) and

V

IO

PWDOWN

6

RXD

300k

V

IO

Receiving Data Output Terminal

CMOS Logic Level Input
When PWDOWN (5pin)=H, the RXD
output will be pulled up to V

IO

at

approximately 300kΩ.

V

IO

Transmitting Data Input Terminal

H : LED (PWDOWN=L)

7

TXD

600k

CMOS Logic Level Output
Holding TXD="H" status, LED will be
turn off approximately 48µs.

LED ANODE Terminal

Other power source can be used

8

LEDA

LED

difference between LEDVCC and VCC.
This can be connected to battery kinds
of unegulated constant source by internal
constant current driver.

−

Shield Case

Connect to Ground.

Rev.A 3/6