TOIM4232-TR3 Vishay, TOIM4232-TR3 Datasheet - Page 4

• Manufacturer Part Number: TOIM4232-TR3
• Description: IC SIR ENDEC IRDA 115.2K 16-SOIC
• Manufacturer: Vishay
• Type: Infrared Encoder/Decoderr

Specifications of TOIM4232-TR3

• Voltage - Supply, Analog: 2.7 V ~ 3.6 V
• Voltage - Supply, Digital: 2.7 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Data Transmission Rate: 2.4 Kbits/s to 115.2 Kbits/s
• Mounting Style: SMD/SMT
• Operating Voltage: 2.7 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 25 C
• Ic Function: SIR Endec For IrDA Application
• Brief Features: Pulse Shaping Function, Programmable Baud Clock Generator, Low Operating Current
• Supply Voltage Range: 2.7V To 3.6V
• Operating Temperature (min): -25C
• Operating Temperature Classification: Commercial
• Operating Temperature (max): 85C
• Package Type: SOIC
• Rad Hardened: No
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Applications: -
• Lead Free Status / Rohs Status: Compliant
• Other names: 751-1200-2

TOIM4232
Vishay Semiconductors
OPERATION DESCRIPTION
The block diagram shows a typical example of an RS232 port
interface. The TOIM4232 connects to an RS232 level
converter on one side, and an infrared transceiver on the
other. The internal TOIM4232 baud rate generator can be
software controlled.
When BR/D = 0, the TOIM4232 interprets the channels
TD_232 to TD_IR and RD_IR to RD_232 as data channels.
On the other hand, whenever BR/D = 1, the TOIM4232
interprets TD_232 as control word for setting the Baud rate.
The Baud rate can be programmed to operate from 1200
bit/s to 115.2 kbit/s. As RS232 level converter, EIA232 or
MAX232 or equivalent are recommended.
When using the TOIM4232 directly connected to an UART it
is compatible to 5 V TTL and 3.3 V CMOS logic.
Typical external resistors and capacitors are needed as
shown in the TFDU4.../TFBS4...-series references.
The output pulse duration can also be programmed, see
chapter “Operation Description”. It is strongly recommended
using 1.627 µs output pulses to save battery power. As
frequency determining component a Vishay XT49M crystal is
recommended, when no external clock is available.
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 (!).
PROGRAMMING THE TOIM4232
For correct, data rate dependent timing the TOIM4232 is
using a built-in baud rate generator. This is used when no
external clock is not available as in RS232 IR-dongle
applications. For programming the BR/D pin has to be set
active, BR/D = 1.
In this case the TOIM4232 interprets the 7 LSBs at the
TD_232 input as a 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.
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 pulses
S0 = (0): 3/16 bit time pulses, not recommended
B0 .. B3: baud rate select words
www.vishay.com
4
CONTROL BYTE (8 BIT)
X
FIRST CHARACTER
S2
S1
S0
[e-mail], [e-mail],
For technical questions within your region, please contact one of the following:
B3
SECOND CHARACTER
B2
SIR Endec for IrDA
Integrated Interface Circuit
B1
LSB
B0
®
Example:
To set TOIM4232 at COM2 port (2F8) to 9600 bit/s with 3/16
bit time pulse duration send to the TOIM4232 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)
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.
TABLE 2 - BAUD RATE SELECT WORDS
Applications
B3
0
1
[e-mail]
B2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
B1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
B0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
CHAR
Document Number: 82546
2
A
B
C
D
E
ND
0
1
2
3
4
5
6
7
8
9
F
Rev. 2.1, 17-Nov-10
BAUD RATE
115.2 kHz
forbidden
forbidden
forbidden
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