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componentes Descripción

Fabricante

73K222AU

Single-Chip Modem Modem with UART

TDK Corporation 

73K222AU

Single-Chip Modem

with UART

UART INTERFACE (continued)

NAME

TXD

DIP PLCC TYPE DESCRIPTION

7

9

O Function is determined by STNDLN pin and bit 7, Tone Control

Register:

STNDLN D7

0

0 TXD is a serial output of UART.

1

0 TXD is forced to a mark.

X

1 TXD is a serial output of UART.

ANALOG / LINE INTERFACE

TXA1

TXA2

RXA

SPKR

OH

3

4

4

5

16

18

17

19

18

20

O (differential) Transmitted Analog. These pins provide the analog

O output signals to be transmitted to the phone line. The drivers

will differentially drive the impedance of the line transformer and

the line matching resistor. An external hybrid can also be built

using TXA1 as a single ended transmit signal.

I

Received Analog. This pin inputs analog information that is being

received by the two-to-four wire hybrid. This input can also be

taken directly from an external hybrid.

O Speaker Output. This pin outputs the received signal through a

programmable attenuator stage, which can be used for volume

control and disabling the speaker.

O Off-hook relay driver. This signal is an open drain output capable

of sinking 20 mA and is used for controlling a relay. The output

is the complement of the OH register bit in CR3.

6

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