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TOIM4232
SIR Endec for IrDA Applications \r\nIntegrated Interface Circuit
TOIM4232
Vishay Semiconductorswww.vishay.comDocument Number 82546
SIR Endec for IrDA Applications
Integrated Interface Circuits
ULC Technology: High-performance gate array package using multiple metal layer CMOS technology
featuring sub-micron channel lengths (0.35 �m)
DescriptionThe TOIM4232 Endec IC provides proper pulse
shaping for the SIR IrDA front end infrared
transceivers 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 stretching 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 software through the RS232 port. The
output pulses are software programmable as either
1.627 �s 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 Pulse shaping function (shortening and stretching)
used in SIR IrDA applications Directly interfaces the SIR transceiver
TFD..– 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 �s pulse selectable SO16 – package 3 V operation voltage, 5 V tolerant inputs Low operating current
Block DiagramTD_232
RD_232
BR/D
RESET
TD_IR
RD_IR
TD_LED
RD_LED
VCC_SD
VCC
Figure 1. Block diagram
