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TOIM4232 Datasheet

  • TOIM4232

  • SIR Endec for IrDA Applications Integrated Interface Circuit

  • 13頁

  • VISHAY   VISHAY

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VISHAY
TOIM4232
Vishay Semiconductors
SIR Endec for IrDA Applications
Integrated Interface Circuit
ULC Technology:
High performance gate array
package using multiple metal layer CMOS technology
featuring sub-micron channel lengths (0.35
碌m).
Description
The TOIM4232 Endec IC provides proper pulse shap-
ing for the SIR IrDA
廬
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 programma-
ble 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
碌s
or 3/16 of bit time. The typical power con-
sumption is very low with about 10 mW in operational
state and in the order of a few microwatts in standby
mode.
18080
Features
鈥?Pulse shaping function (shortening and stretching)
used in SIR IrDA
廬
applications
鈥?Directly interfaces the SIR transceiver TFD..-
series to an RS232 port
鈥?Programmable baud clock generator (1200 Hz to
115.2 kHz), 13 baud rates
鈥?3/16 bit pulse duration or 1.627
碌s
pulse select-
able
鈥?SO16 - package
鈥?2.7 V to 3.6 V operation voltage, 5 V tolerant inputs
鈥?Low operating current
Block Diagram
Vcc
TD_232
RD_232
Endec
RD_IR
TD_IR
BR/D
Baud
Generator
Logic
TD_LED
RD_LED
S1
S2
Vcc_SD
RESET
Osci llator
GND
X1
X2
18079
Document Number 82546
Rev. 1.4, 01-Dec-03
www.vishay.com
1

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