as2578 austriamicrosystems, as2578 Datasheet

as2578

Manufacturer Part Number

as2578

Description

Telephone Controller With 13 Memories And 2-wire Bus

Manufacturer

austriamicrosystems

Datasheet

1.AS2578.pdf (22 pages)

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Data Sheet

Austria Mikro Systeme International

Key Features

Package

Available in 28 pin DIP and PLCC.

Block Diagramme

Rev. 3

Low operating voltage

Low current consumption, standby

Oscillator using Xtal or ceramic resonator (3.58 MHz)

Serial interface to external EEPROM

Consistent, simple and usable procedures

The settings are programmed via the keyboard and

stored in EEPROM or set by pin options

Dialler:

Data protection with 20 digit FIFO

Sliding cursor protocol with comparison

Automatic pause generation

Temporary MF select via keyboard

30 digit LNR (Last Number Redial)

13 x 20 digit memory (RAM) on chip

Tone Ringer:

Ring frequency discrimination

3 tone melody with 4 different repetition rates

Volume of melodies can be set in 4 steps

MUTE

SET

LNR

3.58 MHz

MEM

(AS2578B)

MASK

MUTE

0.1 A

SDA

SCL

TELEPHONE CONTROLLER WITH

OSCILLATOR

INTERFACE

13 MEMORIES AND 2-WIRE BUS

SERIAL

KEYSCAN

DIAL

General Description

The AS2578 /B are a versatile repertory LD/MF diallers

with a melody generator, a ring frequency discriminator

and a 2-wire interface to EEPROM. Together with the

AS2520/1, the AS2578 /B form a coherent basis for a

fully electronic telephone with a wide range of options.

The AS2578 /B are especially designed to adapt to

different PTT specifications. A RAM is on chip for last

number redial, 3 direct dial and 10 numbers with

abbreviated dialling. To allow easy use under a PABX,

the device incorporates automatic pause insertion and

sliding cursor procedure as selectable options (AS2578)

or centrex keys (AS2578B). The device can be used with

or without EEPROM as appropriate. When an EEPROM

is connected, all RAM content is stored in the EEPROM

by power loss.

The circuit provides the possibility to set different modes

of operation (LM codes) via the keyboard or via pin

options, e.g. default signalling mode, automatic pause

insertion, flash or ground loop and settings of volume

and melodies.

AS2578 /B

REDIAL

13 X 20

1 X 30

Vss V

RAM

FIFO

POR

CONTROL

FREQUENCY

DETECTOR

MELODY

STATE

HOOK

DTMF

RING

MODE

AP (AS2578 only)

FCI

AS2578 /B

March 1997

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