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PDF TOIM4232-TR1 Data sheet ( Hoja de datos )
| Número de pieza | TOIM4232-TR1 | |
| Descripción | SIR Endec | |
| Fabricantes | Vishay Siliconix | |
| Logotipo |  |
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SIR Endec for IrDA Applications
Integrated Interface Circuit
TOIM4232
Vishay Semiconductors
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
• Directly interfaces the SIR transceiver
e3
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
Qty / Reel
500 pcs
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, 07-Dec-05
www.vishay.com
1
1 page  
Baud Rate Select Words
B3 B2 B1 B0 2nd
Baud Rate
Char
00000
115.2 k
0011
57.6 k
0102
38.4 k
0113
19.2 k
1004
14.4 k
1015
12.8 k
1106
9.6 k
1117
7.2 k
10008
4.8 k
0019
3.6 k
010A
2.4 k
011B
1.8 k
1 0 0C
1.2 k
1 0 1D
forbidden
110E
forbidden
111F
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 8 bit, 1 stop, 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
for 1.627 µs
are intended to be used. Otherwise
Y=0
send "0Z" for 3/16 bit period pulses.
3/16 bit
"Y6" keeps the 9.6 kbit/s data rate.
length
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, 07-Dec-05
www.vishay.com
5
5 Page 
Reel Dimensions
TOIM4232
Vishay Semiconductors
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, 07-Dec-05
www.vishay.com
11
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| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet TOIM4232-TR1.PDF ] | |
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