TOIM4232

Document Number 82546

Rev. 1.5, 06-Jun-06

Vishay Semiconductors

www.vishay.com

1

18080

SIR Endec for IrDA Applications

Integrated Interface Circuit

Description

The TOIM4232 Endec IC provides proper pulse shap-

as of the 4000-series. For transmitting the TOIM4232

shortens the RS232 output signal to IrDA compatible

electrical pulses to drive the infrared transmitter. In

the receive mode, the TOIM4232 stretches the

received infrared pulses to the proper bit width

depending on the operating bit rate. The IrDA bit rate

varies from 2.4 kbit/s to 115.2 kbit/s.The TOIM4232 is

using a crystal clock 3.6864 MHz for its pulse stretch-

ing and shortening. The clock can be generated by

the internal oscillator. An external clock can be used,

too. The TOIM4232 is programmable to operate from

1200 bit/s to 115.2 kbit/s by the communication soft-

ware through the RS232 port. The output pulses are

software programmable as either 1.627 µs 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.

ULC Technology: High performance gate array

package using multiple metal layer CMOS technology

featuring sub-micron channel lengths (0.35 µm).

Features

• Pulse shaping function (shortening

applications

• Directly interfaces the SIR transceiver

TFD..- and TFB..- series to an RS232 port

• Programmable baud clock generator (1200 Hz to

115.2 kHz), 13 baud rates

• 3/16 bit pulse duration or 1.627 µs pulse select-

able

• SO16 - package

• 2.7 V to 3.6 V operation voltage, 5 V tolerant inputs

• Low operating current

• Lead (Pb)-free device

• Device in accordance to RoHS 2002/95/EC and

WEEE 2002/96EC

Ordering Information

Block Diagram

Part Number

Qty / Reel

TOIM4232-TR1

500 pcs

TD_232

RD_232

BR/D

RESET

TD_IR

RD_IR

TD_LED

RD_LED

Vcc_SD

S2

S1

GND

X1

X2

Vcc

Osci llator

Endec

Baud

Generator

Logic

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