toim4232-tr1 Vishay, toim4232-tr1 Datasheet - Page 5

• Manufacturer Part Number: toim4232-tr1
• Description: Sir Endec For Irda Applications Integrated Interface Circuit
• Manufacturer: Vishay

Baud Rate Select Words
Note: IrDA standard only supports 2.4, 9.6, 19.2, 57.6, and 115.2 kbit/s.
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.
*) For programming the UART, refer to e.g., National Semiconductor’s data sheet of PC 16550 UART
Document Number 82546
Rev. 1.5, 06-Jun-06
B3
0
1
Step.
1
2
3
4
5
B2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
RESET
High
Low
Low
Low
Low
B1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
BR/ D
B0
High
High
Low
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
X
X
Char
2
for 1.627 µs
A
B
C
D
E
F
0
1
2
3
4
5
6
7
8
9
nd
TD_UART
with Y = 1
3/16 bit
length
Y = 0
DATA
YZ
X
X
X
Baud Rate
forbidden
forbidden
forbidden
115.2 k
57.6 k
38.4 k
19.2 k
14.4 k
12.8 k
9.6 k
7.2 k
4.8 k
3.6 k
2.4 k
1.8 k
1.2 k
RD_UART
DATA
X
X
X
X
RD_IR
DATA
X
X
X
X
TD_IR
DATA
X
X
X
X
Wait at least 7 µs. TOIM4232 now is set
to the Control Word programming mode
Examples: Send "1Z" if 1.627 µs pulses
With BR/D = 0, TOIM4232 is in the data
Reprogramming to a new data rate can
Resets all internal registers. Resets to
Wait at least 2 ms, to allow start-up of
be resumed by restarting from step 3.
internal clock. When external clock is
The UART itself also must set to the
send "0Z" for 3/16 bit period pulses.
communication mode. Both RESET
are intended to be used. Otherwise
"Y6" keeps the 9.6 kbit/s data rate.
Vishay Semiconductors
IrDA default data rate of 9600 bit/s
and BR/D must be kept LOW ("0")
Wait at least 1 µs for hold-time.
Sending the Control Word YZ.
Z = 0 sets to 115.2 kbit/s, see
Description and Comments
during data transmission.
used: Wait at least 7 µs.
programming table.
correct data rate *).
TOIM4232
www.vishay.com
5