TOIM3232

Vishay Telefunken

Not for new designs

Rev. A1.1, 02-Apr-01

1 (9)

www.vishay.com

Document Number 82521

Integrated Interface Circuits

ULC Technology:

High-performance gate array package using dual metal layer CMOS technology,

featuring sub-micron channel length (0.8

mm)

Description

The TOIM3232 IC provides proper pulse shaping for

the front end infrared transceivers of the 4000-series

(4000-series

devices

are

infrared

transceiver

compliant to the IrDA standard made by Vishay

Telefunken), as specified by the IrDA standard. In the

transmit mode, the TOIM3232 shortens the RS232

output signal to IrDA compatible electrical pulses to

drive the infrared. In the receive mode, the TOIM3232

stretches the received infrared pulses to the proper bit

width at the operating bit rate. The IrDA bit rate varies

between 2.4 kbit/s to 115.2 kbit/s.

The TOIM3232 is using a crystal clock 3.6864 MHz for

its pulse stretching and shortening. The clock can be

generated by the internal oscillator or an external clock

can be used, too. The TOIM3232 is programmable to

operate from 1200 bit/s to 115.2kbit/s

by

the

communication software through the RS232 port. The

output pulses are software programmable as either

1.627

ms or 3/16 of bit time. The typical power

consumption is very low with about 10 mW in

operational state and in the order of a few microwatts

in standby mode.

Features

D Pulse shaping function (shortening and stretching)

used in infrared IrDA standard applications

D Directly interfaces the infrared transceiver

TFDx4xxx series to RS232 port

D Programmable baud clock generator

(1200 Hz to 115 kHz), 13 baud rates

D SO16L package

D 3 V and 5 V operation

Low operating current

Block Diagram

Pulse

shaper

Clock

generator

Logic

Oscillator

TD_232

RD_232

BR/D

RESET

TD_IR

RD_IR

TD_LED

RD_LED

S1

S2

GND

Figure 1. Block diagram