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PDF TOIM4232 Data sheet ( Hoja de datos )
| Número de pieza | TOIM4232 | |
| Descripción | SIR Endec for IrDA Applications Integrated Interface Circuit | |
| Fabricantes | Vishay Siliconix | |
| Logotipo |  |
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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
1 page  
VISHAY
Baud Rate Select Words
B3 B2 B1 B0 2nd
Baud Rate
Char
00000
115.2 k
00011
57.6 k
00102
38.4 k
00113
19.2 k
01004
14.4 k
01015
12.8 k
01106
9.6 k
01117
7.2 k
10008
4.8 k
10019
3.6 k
1010A
2.4 k
1011B
1.8 k
1 1 0 0C
1.2 k
1 1 0 1D
forbidden
1110E
forbidden
1111F
forbidden
Note: IrDA standard only supports 2.4, 9.6, 19.2, 57.6, and 115.2 kbit/s.
TOIM4232
Vishay Semiconductors
Software for the TOIM4232
UART Programming
For proper operation, the RS232 must be programmed (using 8bit, 1stop, no parity) to send a two character control word, YZ. The control
word YZ is composed of two characters, written in hexadecimal, in format: YZ. The transfer rate for programming must be identical with
the formerly programmed data rate, or after resetting the TOIM4232, the default rate of 9600 bit/s is used.
Step.
RESET
BR/ D TD_UART RD_UART RD_IR
TD_IR
Description and Comments
1 High X X X X X Resets all internal registers. Resets to
IrDA default data rate of 9600 bit/s
2 Low X X X X X Wait at least 2 ms, to allow start-up of
internal clock. When external clock is
used: Wait at least 7 µs.
3
Low High
X
X
X
X Wait at least 7 µs. TOIM4232 now is set
to the Control Word programming mode
4
Low High
YZ
X
X
X Sending the Control Word YZ.
with Y = 1
Examples: Send "1Z" if 1.627 µs pulses are
for 1.627 µs
Y=0
3/16 bit
length
intended to be used. Otherwise send "0Z" for 3/16
bit period pulses. "Y6" keeps the 9.6 kbit/s data
rate. Z = 0 sets to 115.2 kbit/s, see programming
table.
Wait at least 1 µs for hold-time.
5
Low
Low
DATA
DATA
DATA
DATA With BR/D = 0, TOIM4232 is in the data
communication mode. Both RESET
and BR/D must be kept LOW ("0")
during data transmission.
Reprogramming to a new data rate can
be resumed by restarting from step 3.
The UART itself also must set to the
correct data rate *).
*) For programming the UART, refer to e.g., National Semiconductor’s data sheet of PC 16550 UART
Document Number 82546
Rev. 1.4, 01-Dec-03
www.vishay.com
5
5 Page 
VISHAY
Reel Dimensions
W1
TOIM4232
Vishay Semiconductors
Reel Hub
W2 14017
Tape Width
mm
16
A max.
mm
330
N
W1 min.
W2 max.
W3 min.
W3 max.
mm mm mm mm mm
50 16.4 22.4 15.9 19.4
Document Number 82546
Rev. 1.4, 01-Dec-03
www.vishay.com
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet TOIM4232.PDF ] | |
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