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Data Sheet

AS2574B

20 NUMBER ONE TOUCH DIALLER WITH

SERIAL BUS FOR DISPLAY DRIVER

廬

Austria Mikro Systeme International

Key Features

u

u

u

u

u

u

u

u

u

u

u

u

u

u

u

u

u

Low operating voltage (2.5V to 5.5V)

Low current consumption (typ. 200

碌A(chǔ)

in LD mode)

Oscillator using ceramic resonator (681 kHz)

MF level independent of supply voltage

Direct 麓wake-up麓 from keyboard

Automatic Call Progress by direct memory key

Data protection with 8 digit FIFO

Sliding cursor protocol with comparison

Diode options for different PTT requirements

Automatic pause generation after access code

Temporary MF select via keyboard

36 digit LNR (Last Number Redial)

20 memories addressable with direct keys and the

2nd

key or indirect with a

MEM

key

Notepad

Serial interface to display driver AS2590

Consistent, simple and useable procedures

Input for dial tone recognizer

General Description

The AS2574B is an integrated CMOS device for feature

telephones. It is a very versatile LD/MF dialler with serial

interface to a display driver. The device is designed to be

used in a wide variety of applications together with the

companion display driver, AS2590.

The on chip RAM can contain up to 20 memories (each

with maximum 18 digits), a 36 digit Last Number Redial

(LNR) and an 18 digit notepad. Access to the 20 memo-

ries is either with direct keys, abbreviated dial code or a

combination of both. The AS2574B provides a unique

feature, Automatic Call Progress (ACP), on all memory

keys, i.e. the circuit automatically seizes the line and

waits for the dial tone and dials the number just by

pressing any of the memory keys (including LNR).

The circuit features 2 different access code procedures

to allow easy use under a PABX. A dial tone input

enables the use of a dial tone recognizer.

Application

High feature telephone sets.

La

Package

Available in 28 pin DIP and PLCC.

Direct wake-up is an AMS patented

solution providing line seizing with

a telephone, that is entirely

powered from the telephone line,

by pressing a key in a key matrix

connected to a dialler/controller

that is constantly connected to the

line by means of a line voltage

limiter and yet maintaining a high

dc isolation resistance in idle state

(on-hook).

The wake-up feature allows the

user to go off-hook by pressing a

direct memory key or a

loudspeaker key, so-called on-

hook dialling or call progress

monitoring, and thereby seize the

line.

Lb

E

Flash

ER

Ground

Loop

DP

DIALLER/CONTROLLER

1

4

7

2

5

8

0

LNR

3

6

9

#

M9

ENTER M 1

M5

M6

M7

M8

R1

R2

R3

R4

R5

C6

C5

C4

C3

C2

C1

V

DD

HS

MASK

TONE

681kHz

OSC1

OSC2

TB

SPEECH

LOUDHEARING

HANDSFREE

TONE RINGER

R

2ND

M2

M3

*

LS

MODE

ACP

M/B

MS

MUTE M 4

MEM M10

AS2574B

CD

Vss

SCL

SDA

MT

MR

LS

V

DD

SDA

SCL

MS

32.768kHz

X1

X2

BIAS

V

LCD

Vss

V23

V13

DISPLAY

AS2590

Rev. 1

1

Jan. 1995

next

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