TOIM3232 Ver la hoja de datos (PDF) - Vishay Semiconductors
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TOIM3232 Datasheet PDF : 9 Pages
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Not for new designs
TOIM3232
Vishay Telefunken
Operation Description
Control Byte (8 bit)
Figure KEIN MERKER shows a typical example of an
RS232 port interface. The TOIM3232 connects to an
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ RS232 level converter on one side, and an infrared
transceiver on the other. Software can be written to
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ program the TOIM3232 baud rate generator. When
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ BR/D = 0, the TOIM3232 interprets TD_232 data as
First Character
X S2 S1 S0
Second character
B3 B2 B1 B0
LSB
data transmitted to the TFDS4000. On the other hand, where
whenever BR/D = 1, the TOIM3232 interprets X:
Do not care
TD_232 as Control Word. Baud rate can be S1, S2: User programmable bit to program the
programmed to operate from 1200 bit/s to 115 kbit/s.
outputs S1 and S2
As RS232 level converter, EIA232 or MAX232 or S0:
IrDA pulse select
equivalent are recommended.
= (1)
1.627 ms output pulses
Typical external resistors and capacitors are needed
as shown in the TFDx4xxx references.
The output pulse length can be programmed, see
B0 .. B3:
= (0)
3/16 bit time pulses,
not recommended
Baud rate select words
chapter “Operation Description”. To use 1.627 ms
output pulses is strongly recommended to save
battery power. A resonator like a Matura Ceramic Baud Rate Select Words
Resonator (CERALOCK®) CSAC3.68MGC-TC is
recommended.
We strongly recommend not to use this 3/16 mode
because 3/16 pulse length at lower bit rates
consumes more power than the shorter pulse. At
Note:
IrDA standard only supports 2.4, 9.6, 19.2, 57.6, and
115.2 kbit/s.
a data rate of 9600 bit/s, the ratio of power
consumption of both modes is a factor of 12 (!).
B3 B2 B1 B0 2nd Baud
Char Rate
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Features of TOIM3232
0
0
0
0
0 115.2 k
0
0
0
1
1
57.6 k
The baud rate at which an RS232 serial port
0
0
1
0
2
38.4 k
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ communicates with the external adapter is
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ programmable inside the TOIM3232. This
0
0
1
1
3
19.2 k
programmable baud rate is especially useful when the
0
1
0
0
4
14.4 k
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ baud clock and the UART oscillator clock are not
0
1
0
1
5
12.8 k
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ available and must be regenerated. When BR/D = 0,
0
1
1
0
6
9.6 k
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ the TOIM3232 interprets the signals at TD_232 as
0
1
1
1
7
7.2 k
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ transmit and RD_IR as received data. On the other
1
0
0
0
8
4.8 k
hand, whenever BR/D = 1, the TOIM3232 interprets
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ the 7 LSBs at the TD_232 input as the Control Word.
1
0
0
1
9
3.6 k
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ The operating baud rate will change to its supposedly
1
0
1
0
A
2.4 k
new baud rate when the BR/D returns back to
1
0
1
1
B
1.8 k
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ LOW (“0”) Set the UART to 8 bit, no parity, 1 stop bit.
1
1
0
0
C
1.2 k
Document Number 82521
Rev. A1.1, 02-Apr-01
www.vishay.com
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