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Data Sheet AS2540

austriamicrosystems

austriamicrosystems

DATA SHEET (PRELIMINARY)

Remote Controlled Single-Chip-Telephone

AS2540

General Description

The AS2540 is a CMOS integrated circuit that

incorporates a speech circuit (line-adaptation, 2/4-wire

conversion, separate Rx- and Tx-amplifiers for handset

and modem), MF dialler, ring frequency detector, ring

melody generator and a two wire serial interface. It

shall act as an a/b-line-powered device in order to

interface a main-powered CPU to the analogue

telephone line.

AS2540 can operate in a so-called mainpower mode

and in a backup mode. During mainpower mode, a

watchdog timer is running on AS2540, which has to be

reset via the serial interface, which is connected to the

CPU through opto-couplers. During backup mode (=

The main-power failure or SW engine problem),

AS2540 can operate as an independent basic MF

dialler (digits 0-9*#)

Key Features

-

-

-

-

-

-

-

-

-

-

-

-

-

-

Line Interface, Speech Circuit, MF Dialler and Tone Ringer

on a 28 pin CMOS chip

Programmable via 2-wire serial interface

(UART 9600 baud, 8N1)

Watch dog timer for Backup Mode

Additional input for modem transmit path

Additional output for modem receive path

CMOS for high EMC immunity

Low Noise (max. 鈥?2 dBm)

Operating range from 15mA to 100mA (down to 5mA with

reduced performance)

Soft clipping for handset operation to avoid harsh distortion

Line loss compensation selectable by pin option

Real and complex impedance selectable by external

components

Side tone adaption selectable by external components

Ring frequency discrimination

3-tone ring melody generator

Applications

-

-

-

-

-

Web Telephones

Answering Machines

Fax Machines

Base Station of Cordless Telephones

Hospital Communication Units

Package

-

-

28 pin SOIC

Dice-on-Foil

Block Diagram

Main Power Mode

Line

LS

LI

+ 6dB

Backup Mode

Line

LS

LI

+ 6dB

RI

SB

T

-2d B

+ 2d B

ROH

ROT

M1

M2

RI

SB

T

-2dB

+ 2d B

ROH

ROT

M1

M2

CS

Mask

CS

Mask

T

IT

CI

DPn

DT

MF-

generator

T

IT

CI

AGND

DPn

DT

MF-

g enerator

AGND

SMUT

E

S

MASK

S

MAS

K

SMUTE

SROH

SROH

SROT

S

DPn

S

DPn

Dia l

Dig it

Dial

Digit

ST

IT

SROT

ST

IT

RxD

RxD

DIALLER

C1

C2

C3

R1

R2

MODE

UART

T

xD

C1

C2

C3

R1

R2

MODE

VDD

DIALLER

UART

T

xD

VDD

RFD

MO

EHS

MHS

VS

S

OS

C

RFD

MO

EHS

MHS

VS

S

OSC

Revision 3.1

Page 1 of 18

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