AS2578BP [AMSCO]

TELEPHONE CONTROLLER WITH 13 MEMORIES AND 2-WIRE BUS; 13记忆和2线总线电话控制器


型号：	AS2578BP
厂家：	AMS(艾迈斯)
描述：	TELEPHONE CONTROLLER WITH 13 MEMORIES AND 2-WIRE BUS 13记忆和2线总线电话控制器控制器电话
文件：	总22页 (文件大小：283K)
中文：	中文翻译
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Data Sheet

AS2578 /B

TELEPHONE CONTROLLER WITH

13 MEMORIES AND 2-WIRE BUS

Austria Mikro Systeme International

KeyFeatures

General Description

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

with a melody generator, a ring frequency discriminator

❑ Low operating voltage

❑ Low current consumption, standby ≤ 0.1 µA

❑ Oscillator using Xtal or ceramic resonator(3.58MHz)

❑ 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

ToneRinger:

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

slidingcursorprocedureasselectableoptions(AS2578)

orcentrexkeys(AS2578B). Thedevicecanbeusedwith

or without EEPROM as appropriate. When an EEPROM

is connected, all RAM content is stored in the EEPROM

by power loss.

❑ Ring frequency discrimination

❑ 3 tone melody with 4 different repetition rates

❑ Volume of melodies can be set in 4 steps

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.

Package

Available in 28 pin DIP and PLCC.

BlockDiagramme

Vss VDD

(AS2578B)

MUTE

SET

LNR

HOOK

STATE

KEYSCAN

POR

MEM

MODE

AP (AS2578 only)

OSCILLATOR

3.58 MHz

CONTROL

MASK

DTMF

DIAL

REDIAL

MELODY

MUTE

SCL

SDA

13 X 20

1 X 30

RAM

FIFO

RING

FREQUENCY

DETECTOR

SERIAL

INTERFACE

FCI

AS2578 /B

Rev. 3

March 1997

Data Sheet

AS2578 /B

PinDescription

Pin #

Symbol

Function

KeyboardColumns

HookSwitchInput

This input is active high with internal pull-down resistor.

MODE

Signalling(LD/MF)DefaultModeSelectInput

Mode pin

High

Open

Low

Function

LD default mode, make/break pulse 33/66 ms

MF only

LD default mode, make/break pulse 40/60 ms

ChipEnableInput

This input is active high with internal pull-down resistor and is used to initiate setup

procedures.

OSC2

OSC1

Oscillator Input

Oscillator Output

OscillatorpinsforXtalorceramicresonator(3.58MHz).Whenaceramicresonatorisused

a capacitor (10 - 22 pF) must be connected from each of the oscillator pins to V_SS.

Vss

NegativePowerSupply

TONE

DTMFToneOutput

The dual tones provided at this output have a level independent of the supply voltage in

the operating range from 2.5 to 5.5V.

SDA

SCL

Serial Data I/O

SDA is a bidirectional pin with an open drain with internal pull-up resistor and is used to

transfer data into and out of a compatible EEPROM.

Serial Clock Line Output

The SCL output is an open drain with internal pull-up resistor and is used to clock data into

and out of a compatible EEPROM.

FCI

Frequency Comparator Input

Schmitt trigger input for ring frequency discrimination.

Melody Generator Output

Melodies for tone ringing are generated on this output. The output signal is PDM.

MUTE

MuteOutput

This push-pull output is high during dialling and when mute key has been activated,

otherwise low.

MASK

MaskOutput

This push-pull output is high during pulsing (make and break periods).

Continues…

Rev. 3

March 1997

Data Sheet

AS2578 /B

PinDescriptioncont´d

Pin #

Symbol

Function

DPN

DialPulseOutput

This is the push-pull output for controlling the hook-switch transistor. It is low during on-

hook and break periods and high during off-hook (see timing diagrammes).

GroundLoopOutput

This push-pull output is high during ground loop

VDD

PositivePowerSupply

KeyboardRows

Keyboard Column (AS2578)

This column is for the memory keys

Keyboard Column (AS2578B)

This column is for centrex keys (A - D keys). Automatic pause insertion and Temporary

MF select 1 are fixed enabled (AP open)

Access Pause Select Input (AS2578)

This input is used to select the automatic access pause insertion or sliding cursor (no

centrex keys):

AP pin

High

Open

Low

Function

Sliding cursor enabled

Temporary MF select 2

Temporary MF select 1

Automatic pause insertion enabled

Sliding cursor and pause disabled

Keyboard Column (AS2578B)

This column is for the memory keys

Melody Volume Select Input

This input is used to select the volume of the melodies in 4 steps by connecting the MV

pin to row 1, 2, or 3. Leaving the pin open is the default setting (max. volume).

RepetitionRateSelectInput

This input is used to select the repetition rate of the melodies. 4 different rates can be

selected by either leaving the pin open (default) or connecting it to column 1, 2, or 3.

Note: "Open" means ≥ 100 kΩ.

Power On Reset

Initial Setup

The on chip power on reset circuit monitors the supply

voltage (V_DD). As long as V_DDremains below the internal

reference voltage, Vref (typically 1.1V), the oscillator is

inhibited. When V_DDrises above Vref (t_RISE= 1 µs/V to 50

ms/V), aresetsignalisgeneratedtoassurecorrectstart-

up.

A low to high transition on the CE input will initiate an

automatic setup, i.e. the pin options are scanned and

(when an EEPROM is connected) the stored LM codes

and melody settings are read from the EEPROM. This is

done independently of the hook state (see timing

diagrammes).

Rev. 3

March 1997

Data Sheet

AS2578 /B

Furthermore, the mode can be selected by setting the

LM code (see setup menu). If no LM code is set, the

mode will be determined by the MODE pin.

ValidKeys

The keyscanning is enabled when CE or HS are high.

During setup the keyboard is disabled. A valid key is

detectedfromthekeyboardbyconnectingtheappropriate

row to the column. This can be done using an n x m

keyboard matrix with single contacts. Positive and

negative edges of each contact are debounced. The

debounce time is 15 ms.

When default LD mode is selected, a temporary change

to MF mode can be invoked by pressing * (AP = high,

AS2578 only) or Set, * , Set.

When the circuit is in temporary MF mode, each of the

following procedures revert it to default LD mode:

MuteKey

- pressing Set, * , Set ,

Themutekeyisonlyenabledwhenoff-hook.Depressing

the mute key activates and deactivates (toggle switch)

the MUTE output, when internal mute is inactive, i.e. in

speech mode.

- pressing recall key (by further entries of the recall key

the signalling mode will toggle between MF and LD,

- by next On-hook.

Any key entry overwrites a mute activated by the mute

key, and mute will be deactivated.

LastNumberRedial

LNR is a facility that allows resignalling of the last

manually dialled number without keying in all the digits

again. The LNR is repeatable.

Centrex Keys (AS2578B only)

The alphameric keys accommodate easy use of centrex

services. The A, B, C and D keys are only valid in MF

mode and are not storable. Pressing one of these keys

will invoke the appropriate MF tones to be transmitted.

The centrex keys are not stored in the RAM, but are

buffered in the FIFO, and subsequently entered digits

are also buffered in the FIFO.

The current contents of the RAM are overwritten by new

entries.

Amanuallyenterednumberisautomaticallystoredinthe

LNR RAM. The capacity of the RAM is 30 digits. If a

number greater than 30 digits is entered, the LNR facility

will be inhibited (until new entries < 31 digits) and further

entries will be buffered in FIFO.

Pressingtherecallkeyafterasequenceincludingcentrex

keys will reset the RAM counter, and subsequently

entereddigitswillbestoredintheRAM. IfMFselect(Set,

* , Set) has been invoked once, then all susequently

digits/data will be buffered in the FIFO.

Postdialled digits, i.e. digits manually entered after LNR

has been invoked, are not stored in RAM but buffered in

FIFO.

Memory Keys

The keys M1 to M3 are direct memory access keys and

the MEM key is used for abbreviated dialling.

RecallFunction

A recall activation will invoke a flash (timed loop break)

or a ground loop (GL) depending on the selected LM

code, which is stored in the external EEPROM (see

setup menu).

13 numbers can be stored in on chip RAM. Each number

can contain up to 20 digits (including pauses).

If no LM code is set, depressing the recall key will invoke

both a flash and a GL, however, in LD mode a Flash is

never executed.

IfanEEPROMisconnectedtotheserialbus, thecontent

of the RAM is written into the EEPROM when CE is

turned low indicating a power loss.

If recall is the first entry in a digit string, it will be stored

in LNR RAM when digit(s) are entered after the recall.

During programming multible pauses can be inserted by

pressing the LNR key.

If the recall key is depressed after a digit string has been

entered or dialled out, the recall will not be stored, and

subsequently entered digits will be stored in the LNR

RAM as the new number.

Memory dialling is cascadable.

ModeSelection

The default mode (LD or MF) can be selected by the

MODE pin.

If pressing the recall key is not followed by digit entries,

the LNR RAM remains intact.

Rev. 3

March 1997

Data Sheet

AS2578 /B

After a recall a pause will automatically be generated.

The pause time is 3 sec.

protocol. The protocol defines any device that sends

data onto the bus as a transmitter, and the receiving

deviceasthereceiver.TheAS2578/Barecontrollingthe

transfer and hence the master. The EEPROM being

controlled is the slave.

The ground loop (GL) has two pulse lengths, namely a

short of 500 ms and a long of 1250 ms.

Short GL: If the recall key is depressed for ≤ 540 ms, the

GL pulse is 500 ms.

The AS2578 /B will always initiate data transfer, and

providetheclockforbothtransmitandreceiveoperations.

Therefore, the protocol is for single master applications

only.

Long GL: If the recall key is depressed for > 540 ms, the

GL pulse is 1250 ms.

However, a temporary second master can be used to

writeintotheEEPROMwhentheAS2578/Baresupplied

and in idle state.

DuringredialagroundloopisonlyexecutedasalongGL

(1250 ms).

ClockandDataConventions

Data states on the SDA line can change only during SCL

low. SDA state changes during SCL high are reserved

for indicating start and stop conditions (see figure 1 and

2).

PauseGeneration

Pause introduces a delay in signalling digit strings to

accommodate second and subsequent dial tones.

StartCondition

Automaticpausesaregeneratedinthefollowingmanner:

- always after a recall independent of the AP pin

Allcommandsareprecededbythestartcondition, which

is a high to low transition of SDA when SCL is high. The

slave should continuously monitor the SDA and SCL

lines for the start condition and must not respond to any

command until this condition has been met.

- with automatic pause insertion enabled by pin option

or LM code, up to two pauses can be automatically

insertedatanylocationoftheoriginalentryintheRAM

(except location 1 of the digit string), when the mute

outputgoesinactive(inMFmodeformorethan1sec.)

before next entry.

StopCondition

All communications are terminated by a stop condition,

which is low to high transition of SDA when SCL is high.

The stop condition is also used to place the slave in the

standby power mode.

ApausereadfromtheRAMcanbeterminated(shortened)

prior to time out by a low level on AP pin (AS2578 only)

during the pause execution. The pause time is 3 sec.

Acknowledge

Acknowledge is a software convention used to indicate

successfuldatatransfers.Thetransmittingdevice,either

master or slave, will release the bus after transmitting

eight bits. During the ninth clock cycle the receiver will

pull the SDA line low to acknowledge that it received the

eight bits of data (see figure 3).

During execution of a pause, mute is inactive, i.e. the

circuit is in speech mode.

Sliding Cursor Procedure (AS2578 only)

Toaccommodateredialling(LNR)behindaPABXwithout

using automatic pause generation, a sliding cursor

protocol is implemented. The sliding cursor is enabled

when AP = high. If new entries match the previous RAM

contents,pressingtheLNRkeywilldialouttheremaining

digits.

The slave should always respond with an acknowledge

afterrecognitionofastartconditionanditsslaveaddress.

If both the device and a write operation have been

selected, theslaveshouldrespondwithanacknowledge

after receipt of each subsequent eight bit word.

In the read mode, when the EEPROM has transmitted

eight bits of data, it should release the SDA line and

monitor the line for an acknowledge. If the AS2578 /B

respond with an acknowledge and does not generate a

stopcondition, theEEPROMshouldcontinuetotransmit

data. If the AS2578 /B do not respond with an

acknowledge, the EEPROM should terminate further

If there is an error in matching, the LNR will be inhibited

until next on-hook, and the RAM will contain the new

number.

Serial Interface

The AS2578 /B support a bidirectional bus oriented

Rev. 3

March 1997

Data Sheet

AS2578 /B

data transmission and await the stop condition to return

to the standby power mode.

ToneGenerator

The tone generator incorporates the DTMF tones and 3

basic frequencies for the tone ringer.

DTMF

SDA

SCL

The DTMF generator provides 8 frequencies, namely:

Low group

Row 1

Row 2

Row 3

Row 4

697 Hz

770 Hz

852 Hz

941 Hz

data

stable change

data

Figure 1 Data Validity

High group

Col. 1

1209 Hz

1336 Hz

1477 Hz

1633 Hz

Col. 2

Col. 3

Col. 6

SDA

SCL

(AS2578B only)

The MF tones are in accordance with CEPT

recommendations.

start

bit

stop

bit

ToneRinger(Melody)

The three basic frequencies of the melodies are:

Figure 2 Definition of Start and Stop

F1 = 800 Hz, F2 = 1067 Hz, and F3 = 1333 Hz (± 5%).

SCL from

master

The repetition rate can be set via key procedures or by

pin options as follows:

Data out

from Tx

Data out

from Rx

LM code

Repetition rate

1 time (50 ms pause)

acknowledge

start

2 (default)

4 times

7 times

10 times

Figure 3 Acknowledge Response From Receiver

Repetition rate means that a sequence of 6 frequencies

is repeated 1 to 10 times within 1 sec. For LM code 1 a

pause of 50 ms is inserted between the frequencies to

allow a better recognition of the melodies.

FrequencyComparator

The frequency comparator monitors that the ring signal

is in the limits as shown in figure 4.

The sequence of the frequencies is controlled by the

sequence register as follows:

Tol.

MUST

DETECT

Sequence F1 F2 F3 F1 F2 F3 …

Ring

frequency

The volume of the melodies (MO output) can be set as

follows:

(Hz)

LM code

Volume

Steps

Figure 4 Detection Window of Ringing Signal

- 17.5 dB

- 11.5 dB

- 5.5 dB

When a continious valid ring signal is present for 80 ms,

the melody generator is activated and remains active

until two or more periods of the ring signal are missing.

6 dB

(default)

0 dB 5.5 dB

Rev. 3

March 1997

Data Sheet

AS2578 /B

LMCodesandPinOptions

LMcode

02-2*

02-3

Pinoption

AP = L

Function

Automatic pause insertion: off

Automatic pause insertion: on

Automatic pause insertion: off

Sliding cursor: off

Sliding cursor: on

MF select 1

AP = Hi-Z

AP = H

MODE = L

MODE = H

MF select 1

MF select 2

033*

036

LD mode 40/60

LD mode 33/66

MF mode

037

MF mode

Flash

MODE = Hi-Z

MF mode

GL + Flash

250

Resets all user settings to default and clears all RAM contents

Clears all RAM contents

258

5 - 4*

5 - 3

5 - 2

5 -1

MV = Hi-Z

MV = R3

MV = R2

MV = R1

RR = Hi-Z

RR = C1

RR = C2

RR = C3

Melody volume:

Repetition rate:

0 dB

- 5.5 dB

- 11.5 dB

- 17.5 dB

1 time (50 ms pause)

4 times

6 - 1

6 - 2*

6 - 3

6 - 4

7 times

10 times

Note 1: ProgramminganLMcodeoverwritespinoptions,however,LMcode033canonlybeselectedwhentheMODE

pin is connected to either high or low for selecting the make/break ratio. Not valid LM codes are ignored. LM

codes with a '*' are default settings.

Note 2: When the AP pin is pulled low during execution of a pause, the pause will be terminated.

Note 3: AP pin option not available on AS2578B.

Rev. 3

March 1997

Data Sheet

AS2578 /B

OperatingProcedures

ProcedurePrinciples

The procedures for utilizing the features of the AS2578 /B are optimized out of consideration for the human factor in

order to:

- meet the user´s expectations

- be easy to learn and relearn

- not invoke any automatic functions which the user doesn´t expect

- protect the user from committing critical errors, e.g. dialling wrong numbers, etc.

- be consistent, simple and usable

- meet the German 1 TR 2 and ETR 2 specifications.

Symbols

States:

Entries:

Processing:

Idle (on-hook,

no ringing)

sec

Time out (x sec.)

Going off-hook

Going on-hook

Dialling

(LD or MF)

Ringing

Storing (writing into

RAM or EEPROM)

KEY

Pressing a key

Speech mode

Privacy mute

Processing

according to text

TEXT

Entering a

number

Melodies activated

(ringing)

Entry according

to text

TEXT

Programming

= reading from

memory

Enter

password

1590

False programme

entry

Invalid entry

State according

to text

TEXT

Rev. 3

March 1997

Data Sheet

AS2578 /B

Setup Procedures

SET

ANY OTHER

ENTRY

5 or 6

M1-3

MEM

Storing Direct Numbers

Temporary MF Select

Programming Melody

Storing Indirect Numbers

LM Codes:

LNR

FALSE

1590

022 = no AP, no SC

023 = AP, no SC

Clear

Procedures

033 = LD (MODE pin = VDD or Vss), GL

036 = MF, GL

ANY OTHER

ENTRY

037 = MF, FL

LNR

250 = Resets all settings to default, inhibits LNR

and memories

258 = Inhibits LNR and memories

LM Codes

022 or 023 or

033 or 036 or 037

ANY OTHER

SEQUENCE

LM Code

250

LM Code

258

LNR

SET

Resets all

settings

to default

022, 023 executed.

033, 036, 037

buffered

022, 023 executed.

033, 036, 037

buffered

LNR

Exit programme state

sec

SET

Rev. 3

March 1997

Data Sheet

AS2578 /B

ClearProcedures

SET

ANY OTHER

ENTRY

5 or 6

M1-3

MEM

Storing Direct Numbers

Temporary MF Select

Programming Melody

Storing Indirect Numbers

ANY OTHER

ENTRY

LNR

1590

Setup Procedures

LM Codes:

ANY OTHER

SEQUENCE

LM Code

258

258 = Inhibits LNR and memories

LNR

SET

LNR

Exit programme state

SET

sec

Rev. 3

March 1997

Data Sheet

AS2578 /B

ProgrammingMelody

SET

ANY OTHER

ENTRY

5 or 6

M1-3

MEM

Storing Direct Numbers

Temporary MF Select

Setup Procedures

Storing Indirect Numbers

Clear Procedure

Key

1, 2, 3, or 4

ANY OTHER

ENTRY

IGNORED

LM Codes:

(5) 1 = Melody volume - 17.5 dB

(5) 2 = Melody volume - 11.1 dB

(5) 3 = Melody volume - 5.5 dB

SET

(5) 4 = Melody volume

0 dB (default)

(6) 1 = Repetition rate 1

(6) 2 = Repetition rate 4 (default)

(6) 3 = Repetition rate 7

Executing

LM Code

(6) 4 = Repetition rate 10

Exit programme state

SET

sec

Rev. 3

March 1997

Data Sheet

AS2578 /B

ProgrammingVolumeofMelodyDuringRinging

RINGING

Key

1, 2, 3, or 4

ANY OTHER

ENTRY

Only one change during a

ringing phase!

IGNORED

LM Codes:

1 = Volume - 17.5 dB

2 = Volume - 11.5 dB

3 = Volume - 5.5 dB

4 = Volume

0 dB (default)

Executing

LM Code

End of ringing

Rev. 3

March 1997

Data Sheet

AS2578 /B

Temporary MF Select 1

(AP pin = open or low)

RAM

FIFO

Set, * , Set

Pressing any other key does not

change the state.

FIFO

Set, * , Set

FIFO

Set, * , Set

EXIT FIFO

Rev. 3

March 1997

Data Sheet

AS2578 /B

Temporary MF Select 2 (AS2578 only)

(AP pin = high)

RAM

FIFO

Set, * , Set

Pressing any other

key does not

change the state.

FIFO

Set, * , Set

FIFO

Set, * , Set

EXIT FIFO

Rev. 3

March 1997

Data Sheet

AS2578 /B

Automatic Dialling

MEM

0 - 9

M1-3

LNR

Postdialled digits are not stored

but buffered in FIFO

Rev. 3

March 1997

Data Sheet

AS2578 /B

Storing Numbers

SET

ANY OTHER

ENTRY

5 or 6

Temporary MF Select

Set Procedures

Programming

Melody

M1-3

MEM

0 - 9

M1-3

MEM

M1-3

MEM

SET

Exit programme state

SET

sec

CLEARS SAID

RAM MEMORY

LOCATION

CLEARS SAID

RAM MEMORY

LOCATION

Rev. 3

March 1997

Data Sheet

AS2578 /B

PrivacyMute

MUTE

Rev. 3

March 1997

Data Sheet

AS2578 /B

ElectricalCharacteristics

AbsoluteMaximumRatings

Positive Supply Voltage...................................................................................................................-0.3V ≤ V_DD≤ 7V

Input Current ................................................................................................................................................± 25 mA

Digital Input Voltage......................................................................................................V_SS- 0.3V ≤ V_IN≤ V_DD+ 0.3V

Electrostatic Discharge (HBM) ........................................................................................................................±800V

Storage Temperature ......................................................................................................................-65°C to +125°C

Recommended Operating Conditions

Supply Voltage (except DTMF) .....................................................................................................2.2V ≤ V_DD≤ 5.5V

Supply Voltage (DTMF).................................................................................................................2.5V ≤ V_DD≤ 5.5V

Oscillator Frequency ..................................................................................................................................3.58 MHz

Operating Temperature....................................................................................................................- 25°C to +70°C

DC Characteristics (Default conditions: recommended operating conditions; outputs unloaded; V_DD= 3.5V;

AP and MODE = Vss; unless otherwise specified))

Symbol

I_DD0

I_DD

Parameter

Conditions

HS = L; CE = L

HS = H; Osc. = 0

no tones

Min

Typ

Max

0.1

Units

µA

Standby Current

Operating Current

Input Voltage, Low

Line Voltage, High

Output Current, Sink

Output Current, Source

Pull-down Resistor

3.6

µA

I_DD

400

0.9

700

µA

I_DD

MF/melody

1.5

V_IL

V_SS

0.2 V_DD

V_DD

V_IH

0.8 V_DD

I_OL

V_OL= 0.4V

1.5

MΩ

I_OH

V_OH= V_DD- 0.4V

R_HS

R_CE

AC Charateristics (Default conditions: recommended operating conditions)

Symbol

Parameter

Conditions

Min

Typ

Max

Units

t_S

Clock Startup Time

Key Debounce Time

HS Debounce Time

Setup Time

t_D

14.7

t_HS

t_SU

100

Continues…

Rev. 3

March 1997

Data Sheet

AS2578 /B

ACCharacteristicsCont´d

Symbol

Parameter

DTMF

Conditions

Min

Typ

Max

Units

V_MF

∆V_L-H

THD

t_TD

MF Tone Level

High group, R_L= 15 kΩ

-12.3

2.0

-10.8

2.4

-9.3

2.8

-23

dBm

Preemphasis Low to High R_L= 15 kΩ

Distortion (0.3 - 4 kHz)

Tone Duration

Inter Tone Pause

Tone Rise Time

Tone Fall Time

R_L= 15 kΩ, note 3

dBr

Note 1

Note 2

82.3

t_ITP

t_TR

t_TF

t_DR

Dial Rate

±5%

40.8/61.2

33/66

840

pps

t_M/B

Make/Break Period

±5%, MODE = low

±5%, MODE = high

t_IDP

t_MO

Inter Digit Pause

Mute Overhang

800

880

t_M

t_FD

Flash Duration

100

495

1200

2.9

102

505

1300

3.1

sec

t_GLS

t_GLL

t_AP

Ground Loop, Short

Ground Loop, Long

Automatic Pause

Melody

R key ≤ 540 ms

500

1250

3.0

R key > 540 ms

V_MO

t_MD

t_DT

Melody Output

PDM

Melody Delay

830

1110

1385

Frequency 1

770

1025

1280

800

1067

1333

Frequency 2

Frequency 3

Detection Time

Detection Time-out

Min. Detection Frequency

Max. Detection Frequency

t_TO

note 4

f_MIN

f_MAX

Note 1: The values are valid during automatic dialling and are minimum values during manual dialling, i.e. the tones will

continue as long as the key is depressed.

Note 2: The rise time is the time from 10% of final value till the tone amplitude has reached 90 % of its final value.

Note 3: Relative to high group.

Note 4: The FCI circuit is reset by POR and on-hook. After a reset the FCI circuit is in a standby state. A positive edge on FCI

will start the 73 ms timer and the frequency discrimination is initiated. Whenever a period of the ring frequency is

missing, the timer is reset. When a valid ring signal is present for ≥ 73 ms, the melody generator is started and is

directly controlled by a valid signal from the FCI circuit. This condition will remain until a new reset.

Rev. 3

March 1997

Data Sheet

AS2578 /B

PinConfigurations

MODE

OSC2

OSC1

Vss

OSC1

Vss

V^DD

TONE

MASK

MUTE

MASK

MUTE

SDA

SCL

FCI

28 Pin DIP

MODE

OSC2

OSC1

Vss

AS2578

OSC2

OSC1

Vss

AS2578B

VDD

TONE

28 Pin PLCC

Rev. 3

March 1997

Data Sheet

AS2578 /B

Ordering Information:

Part Number Package

Pin 25

Pin 26

AS2578 P

AS2578 N

AS2578B P

AS2578B N

28 pin DIP

28 pin PLCC

28 pin DIP

28 pin PLCC

Applications:

For application support contact your local AMS sales office.

Devices sold by Austria Mikro Systeme are covered by the warranty and patent indemnification provisions appearing in its Term of

Sale. Austria Mikro Systeme makes no warranty, express, statutory, implied, or by description regarding the information set forth

herein or regarding the freedom of the described devices from patent infringement. Austria Mikro Systeme reserves the right to

changespecificationsandpricesatanytimeandwithoutnotice.Therefore,priortodesigningthisproductintoasystem,itisnecessary

to check with Austria Mikro Systeme for current information. This product is intended for use in normal commercial applications.

Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as

military, medical life-support or life-sustaining equipment are specificallynot recommended without additional processing by Austria

Mikro Systeme for each application.

the prior written consent of the copyright owner.

Rev. 3

March 1997

AS2578BP [AMSCO]

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