toim5232 Vishay, toim5232 Datasheet - Page 4

• Manufacturer Part Number: toim5232
• Description: Sir Endec For Irda? Applications Integrated Interface Circuit
• Manufacturer: Vishay

TOIM5232
Vishay Semiconductors
X: do not care
S1, S2: user programmable bit to program the outputs S1
and S2
S0: IrDA pulse select
S0 = (1): 1.627 µs output pulses
S0 = (0): 3/16 bit time pulses, not recommended
B0 to B3: baud rate select words according following table.
Example:
To set TOIM5232 at COM2 port (2F8) to 9600 bit/s with
3/16 bit time pulse duration send to the TOIM5232 in
programming mode in e.g. “basic”
OUT &H2F8, (&H6)
For same port, 9600 bit/s and 1.627 µs pulse duration send
OUT &H2F8, (&H16)
For additionally activating S1 send
OUT &H2F8, (&H36)
SOFTWARE FOR THE TOIM4232 AND TOIM5232 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 TOIM5232, the default rate of 9600 bit/s is used.
Note
It is recommended reading the I/O buffer after transmission waiting the specified latency allowance. That avoids receiving unexpected data from
pulses stochastically generated by many transceivers during the latency time.
(1)
www.vishay.com
4
CONTROL BYTE (8 BIT)
For programming the UART, refer to e.g., National Semiconductors datasheet of PC 16550 UART.
X
STEP.
FIRST CHARACTER
1
2
3
4
5
S2
RESET
High
Low
Low
Low
Low
S1
S0
[e-mail], [e-mail],
BR/D
High
High
Low
For technical questions within your region, please contact one of the following:
X
X
B3
SECOND CHARACTER
3/16 bit length
TD_UART
with Y = 1:
B2
1.627 µs
SIR Endec for IrDA
Y = 0
Data
YZ
X
X
X
Integrated Interface Circuit
B1
RD_UART
LSB
B0
Data
X
X
X
X
®
RD_IR
Note
IrDA standard only supports 2.4 kbit/s, 9.6 kbit/s, 19.2 kbit/s,
57.6 kbit/s, and 115.2 kbit/s (3.6864 MHz clock). Doubling the baud
rates is allowed by doubling the clock frequency.
Data
BAUD RATE SELECT WORDS
Applications
X
X
X
X
B3
0
0
0
0
0
0
0
0
1
1
1
1
1
[e-mail]
B2
0
0
0
0
1
1
1
1
0
0
0
0
1
TD_IR
Data
X
X
X
X
B1
0
0
1
1
0
0
1
1
0
0
1
1
0
Wait at least 7 µs. TOIM5232 now is set to
“0Z” for 3/16 bit period pulses. “Y6” keeps
115.2 kbit/s, see programming table. Wait
from step 3. The UART itself also must set
are intended to be used. Otherwise send
With BR/D = 0, TOIM5232 is in the data
communication mode. Both RESET and
BR/D must be kept low (“0”) during data
Examples: Send “1Z” if 1.627 µs pulses
transmission. Reprogramming to a new
data rate can be resumed by restarting
Resets all internal registers. Resets to
Wait at least 2 ms, to allow start-up of
internal clock. When external clock is
the control word programming mode
the 9.6 kbit/s data rate. Z = 0 sets to
DESCRIPTION AND COMMENTS
IrDA default data rate of 9600 bit/s
Sending the control word YZ.
B0
at least 1 µs for hold-time.
to the correct data rate
0
1
0
1
0
1
0
1
0
1
0
1
0
used: wait at least 7 µs.
CHAR
Document Number: 81749
2
A
B
C
0
1
2
3
4
5
6
7
8
9
nd
Rev. 1.2, 17-Nov-10
BAUD RATE
115.2 kHz
57.6 kHz
38.4 kHz
19.2 kHz
14.4 kHz
12.8 kHz
9.6 kHz
7.2 kHz
4.8 kHz
3.6 kHz
2.4 kHz
1.8 kHz
1.2 kHz
(1)
.