toim5232 Vishay, toim5232 Datasheet - Page 9

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

Note
X: do not care
S1, S2: user-programmable bit to program the outputs S1 and S2. In
the example, S1 is set active, and S2 is inactive.
S0: IrDA pulse select
S0 = (1): 1.627 µs output
S0 = (0): 3/16 bit time pulses, not recommended
B0 to B3: baud rate select words according to the following table
below.
Notes
Bold: See example
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 permissible by doubling the clock frequency.
In figure 2 the programming sequence is shown for a bit rate
of 12.8 kbit/s.
Document Number: 81749
Rev. 1.2, 17-Nov-10
MSB
STA
TABLE 1 - CONTROL BYTE (8 BIT)
TABLE 2 - TRANSMISSION RATE SELECT
WORDS
In the oscilloscope that will be shown in the reserved order with
X
0
0
0
B3
FIRST CHARACTER
0
0
0
0
0
0
0
0
1
1
1
1
1
LSB
S2
B0
0
1
FIRST CHARACTER
B2
0
0
0
0
1
1
1
1
0
0
0
0
1
S1
B1
1
0
LSB first, see figure 2.
B1
0
0
1
1
0
0
1
1
0
0
1
1
0
S0
B2
1
1
[e-mail], [e-mail],
Example
Example
B3
B3
B1
For technical questions within your region, please contact one of the following:
SECOND CHARACTER
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
B2
S0
SECOND CHARACTER
1
1
HEX
A
B
C
0
1
2
3
4
5
6
7
8
9
SIR Endec for IrDA
B1
S1
0
1
Integrated Interface Circuit
BIT RATE
115.2 kHz
57.6 kHz
38.4 kHz
19.2 kHz
14.4 kHz
12.8 kHz
LSB
9.6 kHz
7.2 kHz
4.8 kHz
3.6 kHz
2.4 kHz
1.8 kHz
1.2 kHz
B0
S2
1
0
MSB
STA
X
0
0
0
®
Fig. 2 - Programming sequence for setting the endec to a bit rate of
Fig. 3 - Programming sequence for setting the endec to a bit rate of
12.8 kbit/s as in figure 2 but with a 3/16 bit pulse duration (S0 = “0”).
When correctly programmed, the endec shortens the pulse
to be transmitted from the full bit duration to either 3/16 of the
bit length or to 1.627 µs (which is 3/16 of the 115.2 kbit/s bit
duration).
recommended.
The received optical pulse shows in case of most of the
Vishay SIR transceivers, constant pulse duration. The endec
stretches that to the correct bit time according the bit rate
setting. This is shown in the following chapters.
sequence with the control byte (Ch2) is applied to TD_232, pin 4.
MSB
Applications
0
1->
2->
1->
2->
12.8 kbit/s. After setting BR/D high (Ch1), the programming
21038
21030
1) Ch1: BR/D; pin 2, vertical scale: 2 V/div., horizontal scale: 200 µs/div.
2) Ch2: TD_232; pin 4; programming sequence
0
[e-mail]
1) Ch1: BR/D, pin 2, vertical scale: 2 V/div.,
2) Ch2: TD_232, pin 4; programming sequence
horizontal scale: 200 µs/div.
For
1
power
STA 1
0
Vishay Semiconductors
Example
0
saving,
0
1
0
0
1
the
1
0
TOIM5232
0
short
0
www.vishay.com
LSB
1
pulse
STA
0
is
9