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AS2578 Datasheet

  • AS2578

  • TELEPHONE CONTROLLER WITH 13 MEMORIES AND 2-WIRE BUS

  • 22頁

  • AMSCO

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Data Sheet
AS2578 /B
Austria Mikro Systeme International
廬
TELEPHONE CONTROLLER WITH
13 MEMORIES AND 2-WIRE BUS
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.
Key Features
u
u
u
u
u
u
Low operating voltage
Low current consumption, standby
鈮?/div>
0.1
碌A
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
u
u
u
u
u
u
u
u
u
Package
Available in 28 pin DIP and PLCC.
Block Diagramme
Vss V
DD
(AS2578B)
1
4
7
*
2
5
8
0
3
6
9
#
MUTE
SET
LNR
M1
M2
M3
MEM
A
HS
B
C
D
MODE
KEYSCAN
POR
HOOK
STATE
CE
R
3.58 MHz
OSCILLATOR
CONTROL
AP (AS2578 only)
MV
RR
DP
MASK
GL
MUTE
DIAL
REDIAL
DTMF
MELODY
MF
MO
SCL
SERIAL
INTERFACE
SDA
13 X 20
1 X 30
RAM
FIFO
RING
FREQUENCY
DETECTOR
FCI
AS2578 /B
Rev. 3
1
March 1997

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