toim4232-tr1 Vishay, toim4232-tr1 Datasheet - Page 2

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

TOIM4232
Vishay Semiconductors
Pin Assignment and Description
*) Crystal should be connected as shown in figure 2. In addition connect a 100 k: resistor from Pin 6 to Pin 7 and from Pin 6 and Pin 7 a
22 pF capacitor to ground, respectively. When an external clock is available connect it to Pin 6 leaving Pin 7 open. The external resistor
of 100 k: is used to accelerate the start of oscillation after reset or power - on. The value depends on the "Q" of the resonator. With low
Q resonators it is not necessary. The start - up time of the oscillator is between 30 µs (with piezo resonators) and above 2 ms with high Q
quartzes.
**) All Vishay Semiconductor SIR transceivers fulfill this condition
www.vishay.com
2
Pin Number
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
TD_LED
RD_LED
V
RD_232
TD_232
Symbol
RESET
TD_IR
RD_IR
BR/ D
CC
GND
VCC
NC
X1
X2
S1
S2
_SD
registers. When HIGH, the TOIM4232 sets the IrDA default bit rate of 9600
bit/s, sets pulse width to 1.627 µs. The V
RS232 TXD data line is connected (via a level shifter) to TD_232 input pin.
transceiver is connected to the RD_IR input. This signal is stretched to the
Control Word programs the baud rate width will be effective as soon as BR/
Input of the signal to be transmitted from the RS232 port TXD line (passing
User Programmable Bit. Can be used to turn ON/ OFF a front-end infrared
User Programmable Bit. Can be used to turn ON/ OFF a front-end infrared
Transmit LED indicator driver. Use 180 : current limiting resistor in.series
Receive LED indicator driver. Use 180 : current limiting resistor in series
Outputs an inverted RESET signal. Can be used to shut down the power
down signal. RESET pin can be controlled by either the RTS or DTR line
correct bit length according the programmed bit rate and is routed to the
Resets all internal registers. Initially must be HIGH ("1") to reset internal
reset signal which allows to shut down of a TFDx4x00 transceiver when
through RS232 level converter. Minimum hold time for resetting is 1 µs.
Data received from the RS232 port is interpreted as Control Word. The
TD_IR, driving the TXD input of the IR transceiver. The RXD line of the
Data input from the infrared transceiver, min. pulse duration 1.63 µs **)
external SD like TFDS4203, the reset line can be used directly as shut
Received signal data output of stretched signal to the RS232 RXD line
output function. This pin can be used to shut down a transceiver (e.g.,
The TXD - signal is appropriately shortened and applied to the output
supply of a 4000 series transceiver (e.g., TFDU4100). V
Ground in common with the RS232 port and IrDA transceiver ground
applying the reset signal to the TOIM4232. When using devices with
Crystal input clock, 3.6864 MHz nominal. Input for external clock *)
Data output of shortened signal to the infrared transceiver
transceiver (e.g., an infrared module at the adapter back)
transceiver (e.g., an infrared module at the adapter front)
TFDx4xxx). Output polarity: Inverted RESET input.
BR/ D = 0, data communication mode:
to LED to connect to V
to LED to connect to V
RS232 RXD line at the RD_232 pin.
Disables the oscillator when active.
BR/ D = 1, Programming mode:
Baud Rate control/ Data.
(using level converter).
the level converter).
D return to LOW.
Supply voltage
No connection
Description
Crystal *)
CC
CC
CC
_SD output is simply an inverted
. (V
. (V
CC
CC
= 3.3 V)
= 3.3 V)
CC
shutdown
Document Number 82546
I/O
O
O
O
O
O
O
O
I
I
I
I
I
Rev. 1.5, 06-Jun-06
Active
HIGH
HIGH
HIGH
HIGH
LOW
LOW
LOW
LOW
LOW
LOW