TOIM3232

Vishay Telefunken

Not for new designs

Rev. A1.1, 02-Apr-01

6 (9)

www.vishay.com

Document Number 82521

Recommended Circuit Diagram for Using TOIM3232 and TFDS4500 in IR Adapters at the Serial Port

RTS

RxD

RxD

TxD

TxD

DTR

+5V

RTS

+5V

DTR

LED 1

LED 2

R18

VB1

SUB–D 9

5

9

4

8

3

7

2

6

1

D5

+

C1

R13

R10

Q4

3

2

D6

C3

C4

Jumper

D7

+

C6

C5

R17

R11

U2

TFDS4500

3

4

5

6

7

8

1

2

Vcc

Gnd

Sensitivity

NC (AGCopt.)

Txd

IRED anode

IRED cathode

Rxd

R5

R1

Q2

R2

R12/1

IRED1

D8

D1

Q1

1

R12/2

R3

D2

Q3

QZ1

R6

IREDO3

IREDO2

IREDO1

TO1

+

C02

R02

TOIM3232 U1

1

2

3

4

5

6

7

8

9

15

14

13

12

11

10

16

Reset

BR/Data

RD 232

TD 232

Vcc SD

X1

X2

GND

TD LED

RD IR

TD IR

S2

S1

NC

RD LED

DO1

DO2

D03

R01

R9

D4

1

CO1

RXD

RTS

TXD

DTR

leave off Jumper.

place Jumper and leave off

R11 and C6

–10V

+

C2

Due to the very limited power to be drawn out of the RS232 port, it is recommended to operate the LEDs for displaying

the state of transmission (D3, D4) with lowest possible current or not to use this function without external power supply.

PCB layout, Gerber plots, component list, and control software are available on request.

Figure 3. Discrete solution for the interface to the RS232 port