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PDF AS2578 Data sheet ( Hoja de datos )
| Número de pieza | AS2578 | |
| Descripción | TELEPHONE CONTROLLER WITH 13 MEMORIES AND 2-WIRE BUS | |
| Fabricantes | austriamicrosystems AG | |
| Logotipo |  |
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Data Sheet
AS2578 /B
TELEPHONE CONTROLLER WITH
®
Austria Mikro Systeme International
13 MEMORIES AND 2-WIRE BUS
Key Features
u Low operating voltage
u Low current consumption, standby ≤ 0.1 µA
u Oscillator using Xtal or ceramic resonator (3.58MHz)
u Serial interface to external EEPROM
u Consistent, simple and usable procedures
u The settings are programmed via the keyboard and
stored in EEPROM or set by pin options
Dialler:
u Data protection with 20 digit FIFO
u Sliding cursor protocol with comparison
u Automatic pause generation
u Temporary MF select via keyboard
u 30 digit LNR (Last Number Redial)
u 13 x 20 digit memory (RAM) on chip
Tone Ringer:
u Ring frequency discrimination
u 3 tone melody with 4 different repetition rates
u Volume of melodies can be set in 4 steps
Package
Available in 28 pin DIP and PLCC.
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.
Block Diagramme
1 2 3 MUTE
4 5 6 SET
7 8 9 LNR
* 0#
R
M1
M2
M3
MEM
(AS2578B)
A
B
C
D
Vss VDD
KEYSCAN
POR
HOOK
STATE
3.58 MHz
OSCILLATOR
CONTROL
DP
MASK
GL
MUTE
DIAL
REDIAL
DTMF
MELODY
HS
CE
MODE
AP (AS2578 only)
MV
RR
MF
MO
SCL
SDA
SERIAL
INTERFACE
13 X 20
1 X 30
RAM
FIFO
RING
FREQUENCY
DETECTOR
AS2578 /B
FCI
Rev. 3
1 March 1997
1 page  
Data Sheet
After a recall a pause will automatically be generated.
The pause time is 3 sec.
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.
Long GL: If the recall key is depressed for > 540 ms, the
GL pulse is 1250 ms.
During redial a ground loop is only executed as a long GL
(1250 ms).
Pause Generation
Pause introduces a delay in signalling digit strings to
accommodate second and subsequent dial tones.
Automatic pauses are generated in the following manner:
- always after a recall independent of the AP pin
- with automatic pause insertion enabled by pin option
or LM code, up to two pauses can be automatically
inserted at any location of the original entry in the RAM
(except location 1 of the digit string), when the mute
output goes inactive (in MF mode for more than 1 sec.)
before next entry.
A pause read from the RAM can be terminated (shortened)
prior to time out by a low level on AP pin (AS2578 only)
during the pause execution. The pause time is 3 sec.
During execution of a pause, mute is inactive, i.e. the
circuit is in speech mode.
Sliding Cursor Procedure (AS2578 only)
To accommodate redialling (LNR) behind a PABX without
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, pressing the LNR key will dial out the remaining
digits.
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
AS2578 /B
protocol. The protocol defines any device that sends
data onto the bus as a transmitter, and the receiving
device as the receiver. The AS2578 /B are controlling the
transfer and hence the master. The EEPROM being
controlled is the slave.
The AS2578 /B will always initiate data transfer, and
provide the clock for both transmit and receive operations.
Therefore, the protocol is for single master applications
only.
However, a temporary second master can be used to
write into the EEPROM when the AS2578 /B are supplied
and in idle state.
Clock and Data Conventions
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).
Start Condition
All commands are preceded by the start condition, 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.
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.
Acknowledge
Acknowledge is a software convention used to indicate
successful data transfers. The transmitting device, 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).
The slave should always respond with an acknowledge
after recognition of a start condition and its slave address.
If both the device and a write operation have been
selected, the slave should respond with an acknowledge
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
stop condition, the EEPROM should continue to transmit
data. If the AS2578 /B do not respond with an
acknowledge, the EEPROM should terminate further
Rev. 3
5 March 1997
5 Page 
Data Sheet
Programming Melody
SET
AS2578 /B
ANY OTHER
ENTRY
ANY OTHER
ENTRY
5 or 6
*
1
M1-3
MEM
Key
1, 2, 3, or 4
Temporary MF Select
Storing Direct Numbers
Setup Procedures
&
Clear Procedure
Storing Indirect Numbers
IGNORED
SET
Executing
LM Code
LM Codes:
(5) 1 = Melody volume - 17.5 dB
(5) 2 = Melody volume - 11.1 dB
(5) 3 = Melody volume - 5.5 dB
(5) 4 = Melody volume 0 dB (default)
(6) 1 = Repetition rate 1
(6) 2 = Repetition rate 4 (default)
(6) 3 = Repetition rate 7
(6) 4 = Repetition rate 10
Exit programme state
SET
40 sec
Rev. 3
11 March 1997
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet AS2578.PDF ] | |
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