TOIM4232
Vishay Semiconductors
SIR Endec for IrDA Applications
Integrated Interface Circuit
Description
The TOIM4232 Endec IC provides proper pulse shap-
ing 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 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).
18080
Features
• Pulse shaping function (shortening
and stretching) used in SIR IrDA
®
applications
e3
• 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
Part Number
TOIM4232-TR1
500 pcs
Qty / Reel
Block Diagram
Vcc
TD_232
Endec
RD_232
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. 1.5, 06-Jun-06
www.vishay.com
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