TOIM3232 Ver la hoja de datos (PDF) - Vishay Semiconductors

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Fabricante

TOIM3232

Integrated Interface Circuits

Vishay Semiconductors 

TOIM3232

Vishay Telefunken

Not for new designs

Pin Assignment and Description

Pin Symbol

Function

I/O

1 RESET Resets all internal registers. Initially must be HIGH (“1”) to reset internal I

registers. When HIGH, the TOIM3232 sets the IrDA default bit rate of

9600, sets pulse width to 1.627 ms. Then the TOIM3232 enters the

front-end (TFDS400) power saving mode by setting VCC_SD low and

therefore switching off the transceiver. When RESET returns to LOW,

the TOIM3232 sets VCC_SD HIGH switching on the front-end device,

and sets the new baud rate in the 1.627 ms pulse width mode. In the

application the RESET pin can be controlled by either the RTS or DTR

line through RS232 level converter. Minimum hold time for reset: 1 ms.

2

BR/ D Baud Rate control/ Data.

I

When BR/ D = 0, RD_232 data is transmitted to the IrDA transmitter pin

TD_IR, while RD_IR is routed to the transmitter pin TD_232. When

BR/ D = 1, data received from the RS232 port is interpreted as the

Control Word. The Control Word programs the baud rate and pulse

width will be effective as soon as BR/ D return to LOW.

3 RD_232 Received signal data output of stretched signal to the RS232 port

O

(using level converter).

4 TD_232 Input of the signal to be transmitted from the RS232 port (passing the

I

level converter).

5 VCC_SD VCC shutdown output function. This pin can be used to shut down a

O

transceiver (e.g., TFDx4xxx). Output polarity: Inverted RESET input.

6

X1 Crystal input clock, 3.6864 MHz nominal. Input for external clock *)

I

7

X2 Crystal *)

I

8

GND Ground in common with the RS232 port and IrDA transceiver ground

W 9 TD_LED Transmit LED indicator driver. Use 270 current limiting resistor in

O

10

W series to LED to connect to VCC. (VCC = 5 V)

RD_LED Receive LED indicator driver. Use 270 current limiting resistor in

O

series to LED to connect to VCC. (VCC = 5 V)

11

NC No connection

12

S1 User Programmable Bit. Can be used to turn ON/ OFF a front-end

O

infrared transceiver (e.g., an infrared module at the adapter front)

13

S2 User Programmable Bit. Can be used to turn ON/ OFF a front-end

O

infrared transceiver (e.g., an infrared module at the adapter back)

14 TD_IR Data output of shortened signal to the infrared transceiver TFDx4xxx

O

15 RD_IR Data input from the infrared transceiver TFDx4xxx

I

16

VCC Supply voltage

I

W *) 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.

Active

HIGH

HIGH

HIGH

LOW

LOW

LOW

LOW

LOW

HIGH

LOW

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Document Number 82521

Rev. A1.1, 02-Apr-01

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