TOIM3000/3232

Preliminary Information

TELEFUNKEN Semiconductors

Rev. A4, 26-Mar-96

3 (9)

Pin Description TOIM3232

Pin

Symbol

Function

I/Q

Active

1

RESET

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

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

9600 b/s, sets pulse width to 1.627

ms. Then the TOIM3232 enters the

power-saving mode. When RESET turns to LOW, the TOIM3232 exits

power-saving mode, and sets the baud rate and 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 is 1

ms.

I

HIGH

2

BR/D

Baud Rate control / Data

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 of

TD_IR signal. The new baud rate and pulse width will be effective as

soon as BR/D returns to LOW.

I

3

RD_232

Data output of stretched signal to the RS232 port (using level converter);

received signal

O

HIGH

4

TD_232

Data input from the RS232 port (passing the level converter); signal to be

transmitted

I

HIGH

5

VCC_SD

transceiver (e.g. TFDS3000). Output polarity: Inverted RESET input.

O

LOW

6

X1

Crystal input clock 3.6864 MHz

I

7

X2

Crystal input clock

I

8

GND

Ground in common with the RS232 port and IrDA transceiver ground

9

TD_LED

Transmit LED indicator driver. Use 270

W current limiting resistor in

O

LOW

10

RD_LED

Receive LED indicator driver. Use 270

W current limiting resistor in

O

LOW

11

NC

No connection

12

S1

User-programmable output. Can be used to turn a front end infrared trans-

ceiver ON/OFF (e.g. an infrared module at the adapter front).

O

LOW

13

S2

User-programmable output. Can be used to turn a front end infrared trans-

ceiver ON/OFF (e.g. an infrared module at the adapter back).

O

LOW

14

TD_IR

Data output of shortened signal to the infrared transceiver TFDS3000

O

HIGH

15

RD_IR

Data input from the infrared transceiver TFDS3000

I

LOW

16

Supply voltage

I