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TOIM3232 Datasheet(PDF) 3 Page - Vishay Telefunken

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




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