TOIM4232 Interface Circuit Datasheet

TOIM4232 Datasheet, PDF, Equivalent


Part Number

TOIM4232

Description

SIR Endec for IrDA Applications Integrated Interface Circuit

Manufacture

Vishay Siliconix

Total Page 13 Pages
Datasheet
Download TOIM4232 Datasheet


TOIM4232
VISHAY
SIR Endec for IrDA Applications
Integrated Interface Circuit
TOIM4232
Vishay Semiconductors
ULC Technology: High performance gate array
package using multiple metal layer CMOS technology
featuring sub-micron channel lengths (0.35 µm).
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 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 µs 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
• 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 µs pulse select-
able
• SO16 - package
• 2.7 V to 3.6 V operation voltage, 5 V tolerant inputs
• Low operating current
Block Diagram
TD_232
RD_232
Vcc
Endec
TD_IR
RD_IR
BR/D
RESET
Baud
Generator
Logic
Osci llator
TD_LED
RD_LED
S1
S2
Vcc_SD
GND X1
X2
18079
Document Number 82546
Rev. 1.4, 01-Dec-03
www.vishay.com
1

TOIM4232
TOIM4232
Vishay Semiconductors
VISHAY
Pin Assignment and Description
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Symbol
RESET
BR/ D
RD_232
TD_232
VCC_SD
X1
X2
GND
TD_LED
RD_LED
NC
S1
S2
TD_IR
RD_IR
VCC
Description
Resets all internal registers. Initially must be HIGH ("1") to reset internal
registers. When HIGH, the TOIM4232 sets the IrDA default bit rate of 9600
bit/s, sets pulse width to 1.627 µs. The VCC_SD output is simply an inverted
reset signal which allows to shut down of a TFDx4x00 transceiver when
applying the reset signal to the TOIM4232. When using devices with
external SD like TFDS4203, the reset line can be used directly as shut
down signal. RESET pin can be controlled by either the RTS or DTR line
through RS232 level converter. Minimum hold time for resetting is 1 µs.
Disables the oscillator when active.
Baud Rate control/ Data.
BR/ D = 0, data communication mode:
RS232 TXD data line is connected (via a level shifter) to TD_232 input pin.
The TXD - signal is appropriately shortened and applied to the output
TD_IR, driving the TXD input of the IR transceiver. The RXD line of the
transceiver is connected to the RD_IR input. This signal is stretched to the
correct bit length according the programmed bit rate and is routed to the
RS232 RXD line at the RD_232 pin.
BR/ D = 1, Programming mode:
Data received from the RS232 port is interpreted as Control Word. The
Control Word programs the baud rate width will be effective as soon as BR/
D return to LOW.
Received signal data output of stretched signal to the RS232 RXD line
(using level converter).
Input of the signal to be transmitted from the RS232 port TXD line (passing
the level converter).
Outputs an inverted RESET signal. Can be used to shut down the power
supply of a 4000 series transceiver (e.g., TFDU4100). VCC shutdown
output function. This pin can be used to shut down a transceiver (e.g.,
TFDx4xxx). Output polarity: Inverted RESET input.
Crystal input clock, 3.6864 MHz nominal. Input for external clock *)
Crystal *)
Ground in common with the RS232 port and IrDA transceiver ground
Transmit LED indicator driver. Use 180 current limiting resistor in.series
to LED to connect to VCC. (VCC = 3.3 V)
Receive LED indicator driver. Use 180 current limiting resistor in series
to LED to connect to VCC. (VCC = 3.3 V)
No connection
User Programmable Bit. Can be used to turn ON/ OFF a front-end infrared
transceiver (e.g., an infrared module at the adapter front)
User Programmable Bit. Can be used to turn ON/ OFF a front-end infrared
transceiver (e.g., an infrared module at the adapter back)
Data output of shortened signal to the infrared transceiver
Data input from the infrared transceiver, min. pulse duration 1.63 µs **)
Supply voltage
I/O
O
I
O
I
I
O
O
O
O
O
I
I
Active
HIGH
HIGH
HIGH
LOW
LOW
LOW
LOW
LOW
HIGH
LOW
*) Crystal should be connected as shown in figure 2. In addition connect a 100 kresistor from Pin 6 to Pin 7 and from Pin 6 and Pin 7 a
22 pF capacitor to ground, respectively. When an external clock is available connect it to Pin 6 leaving Pin 7 open. The external resistor
of 100 kis used to accelerate the start of oscillation after reset or power - on. The value depends on the "Q" of the resonator. With low
Q resonators it is not necessary. The start - up time of the oscillator is between 30 µs (with piezo resonators) and above 2 ms with high Q
quartzes.
**) All Vishay Semiconductor SIR transceivers fulfill this condition
www.vishay.com
2
Document Number 82546
Rev. 1.4, 01-Dec-03


Features VISHAY TOIM4232 Vishay Semiconductors SIR Endec for IrDA Applications Integra ted Interface Circuit ULC Technology: High performance gate array package usi ng multiple metal layer CMOS technology featuring sub-micron channel lengths ( 0.35 µm). Description The TOIM4232 En dec IC provides proper pulse shaping fo r the SIR IrDA® front end infrared tra nsceivers as of the 4000-series. For tr ansmitting the TOIM4232 shortens the RS 232 output signal to IrDA compatible el ectrical pulses to drive the infrared t ransmitter. In the receive mode, the TO IM4232 stretches the received infrared pulses to the proper bit width dependin g on the operating bit rate. The IrDA b it rate varies from 2.4 kbit/s to 115.2 kbit/s. The TOIM4232 is using a crysta l clock 3.6864 MHz for its pulse stretc hing and shortening. The clock can be g enerated by the internal oscillator. An external clock can be used, too. The T OIM4232 is programmable to operate from 1200 bit/s to 115.2 kbit/s by the communication software through.
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