TOIM4232-TR3 Vishay, TOIM4232-TR3 Datasheet - Page 14

• 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
TRANSMIT (TXD) CHANNEL
Figure 7 shows the transmission in the default mode. For
data transfer, the endec is set to that mode by BR/D = “0”. In
the examples "6" is always transmitted (binary “00000110”).
The “0” is represented in the IrDA protocol by an optical
pulse. Also here the LSB is transmitted first after the start bit.
“1” is not transmitted.
Channel 1 shows the signal from the RS232 port already
converted to 3 V logic by U1. The endec encodes that signal
to the RZI IrDA format where a “0” is represented by a pulse.
That is the trace of channel 2. This output is connected the
TXD input of the transceiver and this signal is transmitted as
optical output signal. Channel 3 is the signal for an indicator
lamp connected to the TD_LED driver output. Use 180 
serial resistor to supply voltage for limiting the current
through the LED (not shown in the circuit diagram).
When using the (not recommended) 3/16-bit pulse width the
oscillogram looks like figure 8.
www.vishay.com
14
1->
2->
3->
1->
2->
3->
21031
21032
Fig. 8 - Data Transmission with the Setting 9.6 kbit/s,
1) Ch1: TD_232 inp. pin 4, vertical scale: 2 V/div., horizontal scale: 200 µs/div.
2) Ch2: TD_IR, pin 14; 1.6 µs pulse duration
3) Ch3: TD_LED, pin 9
1) Ch1: TD_232, pin 4, vertical scale: 2 V/div., horizontal scale: 200 µs/div.
2) Ch2: TD_IR, pin 14; 3/16 bit pulse duration
3) Ch3: TD_LED, pin 9
Fig. 7 - Data Transmission with 9.6 kbit/s,
STA 0
T
3/16 bit Pulse Duration (19.5 µs)
1.627 µs Pulse Duration
1
1
0
[e-mail], [e-mail],
0
For technical questions within your region, please contact one of the following:
0
0
0
SIR Endec for IrDA
Integrated Interface Circuit
®
The transmission with the highest SIR bit rate of 115.2 bit/s
looks like what is shown in figure 9. However, the horizontal
time scale is different.
RECEIVE (RXD) CHANNEL
In the default 9600 bit/s mode the signals will look like those
shown in figure 10 and figure 11.
duration. By definition, the pulse duration of 1.627 µs is identical to
1->
2->
3->
1->
2->
3->
Applications
Data transmission with the setting 115.2 kbit/s, 1.627 µs pulse
21034
21033
1) Ch1: TOIM4232; RD_IR, pin 15, vertical scale: 2 V/div.,
2) Ch2: TOIM4232; RD_232, pin 3
3) Ch3: TOIM4232; RD_LED, pin 10
Fig. 10 - Data Reception with the Setting 9.6 kbit/s.
1) Ch1: TD_232, pin 4, vertical scale: 2 V/div., horizontal scale: 20 µs/div.
2) Ch2: TD_IR, pin 14; 1.6 µs pulse duration
3) Ch3: TD_LED, pin 9
horizontal scale: 200 µs/div.
[e-mail]
the 3/16-bit pulse width.
Short RXD Pulse.
Fig. 9 -
Document Number: 82546
Rev. 2.1, 17-Nov-10