TOIM3000/3232

Preliminary Information

TELEFUNKEN Semiconductors

Rev. A4, 26-Mar-96

1 (9)

Infrared IrDA Integrated Interface Circuits

ULC-Technology: High-performance gate array package using dual metal layer CMOS technology, featuring

sub-micronic channel length (0.8

mm)

Description

The TOIM3xxx series ICs provide proper timing for the

front end infrared transceiver TFDS3000, as specified by

the IrDA standard. In the transmit mode, the TOIM3xxx

provides IrDA-compatible electrical pulses to the in-

frared transceiver TFDS3000 on logic LOW electrical

input. In the receive mode, the TOIM3xxx stretches re-

ceived infrared pulses to the proper bit width at the

operating bit rate. The IrDA bit rate varies from 2.4 to

115.2 kbit/s.

D For the UART interface, the TOIM3000 uses the

1.8432 MHz clock input as the fast clock and the baud

clock output from the UART to do the pulse stretching

and shortening. The baud clock is 16 times the baud

rate. The output pulses are fixed at 1.627

ms or 3/16 of

bit time.

D For the RS232 interface, the TOIM3232 uses an exter-

nal crystal clock 3.6864 MHz for its pulse stretching

and shortening. The TOIM3232 is programmable to

operate from 1200 bit/s to 115.2 kbit/s by the commu-

nication software through the RS232 port. Output

pulses are software-programmable as either 1.627

ms

or 3/16 of bit time.

The typical power consumption of both circuits is very

low with about 10 mW in operational state. It is in the or-

der of magnitude of microwatts in standby mode.

Features

TOIM3000

D Pulse shaping function (shortening and stretching)

used in infrared IrDA standard applications

D Directly interfaces the infrared transceiver

D 3 V and 5 V operation with low operating current

D SO16L package

TOIM3232

D Pulse shaping function (shortening and stretching)

used in infrared IrDA standard applications

D Directly interfaces the infrared transceiver

D Programmable baud clock generator

(1200 Hz

∼ 115 kHz), 13 baud rates

D 3 V and 5 V operation

D SO16L package

Block Diagrams

Pulse

shaper

TD_IR

RD_IR

TD_232

RD_232

XIN

B_CLK

TD_UART

RD_UART

GND

V

RESET

Baud

clock

generator

TD_232

RD_232

BR/D

GND

RESET

X1

TD_IR

RD_IR

TD_LED

RD_LED

X2

3.6864 MHz

S2

S1

CC

Pulse

shaper

TOIM3000

TOIM3232