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PDF AS2574BN Data sheet ( Hoja de datos )
| Número de pieza | AS2574BN | |
| Descripción | 20 NUMBER ONE TOUCH DIALLER WITH SERIAL BUS FOR DISPLAY DRIVER | |
| Fabricantes | austriamicrosystems AG | |
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Data Sheet
AS2574B
20 NUMBER ONE TOUCH DIALLER WITH
®
Austria Mikro Systeme International
SERIAL BUS FOR DISPLAY DRIVER
Key Features
u Low operating voltage (2.5V to 5.5V)
u Low current consumption (typ. 200 µA in LD mode)
u Oscillator using ceramic resonator (681 kHz)
u MF level independent of supply voltage
u Direct ´wake-up´ from keyboard
u Automatic Call Progress by direct memory key
u Data protection with 8 digit FIFO
u Sliding cursor protocol with comparison
u Diode options for different PTT requirements
u Automatic pause generation after access code
u Temporary MF select via keyboard
u 36 digit LNR (Last Number Redial)
u 20 memories addressable with direct keys and the
2nd key or indirect with a MEM key
u Notepad
u Serial interface to display driver AS2590
u Consistent, simple and useable procedures
u 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.
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.
La
Lb
E
MODE
ACP
M/B
MS
Flash
Ground
Loop
1 2 3 ENTER M1 M5
4 5 6 R M2 M6
7 8 9 2ND M3 M7
* 0 # MUTE M4 M8
LS LNR M9 MEM M10
ER DP
R1
VDD
R2
HS
R3
MASK
R4
TONE
R5
C6 OSC1
C5
C4 OSC2
C3
C2 TB
C1
A S 2 5 7 4 BCD
Vss MT
SCL
SDA
MR
LS
681kHz
DISPLAY
VDD
SDA
SCL
V23
MS
X1
V13
VLCD
X2
BIAS
Vss
32.768kHz
SPEECH
LOUDHEARING
HANDSFREE
TONE RINGER
Rev. 1
1 Jan. 1995
1 page  
Data Sheet
Recall Function
A recall activation will invoke a flash (timed loop break)
or an earth recall (ER) depending on the ER pin. When
the ER pin is forced to V , a flash is executed; and when
DD
ER is open (> 50 kΩ}, an earth recall is executed.
If R is the first entry in a digit string, it will be stored in LNR
RAM.
If the R key is depressed after a digit string has been
dialled out, the recall will not be stored, and subsequently
entered digits will be buffered in the FIFO.
A recall will automatically generate a pause when a recall
is read from a memory and therecall has been stored as
an access code.
A manual invoked earth recall will pull ER high for
minimum 500 ms, but the ER pin is maintained high as
long as the key is depressed.
During auto dial an earth recall is executed with a
duration of 500 ms.
Access Codes
Different access codes (totally up to 18 digit/data inclu-
ding spaces) can be stored in one string. Spaces bet-
ween the different access codes are entered by pressing
the 2nd # during programming. Each access code can
contain up to 4 digits.
If one or more access codes are stored, the first entered
digit(s) in a digit string read from the RAM will be
compared with the access code(s) and if equal, a pause
is generated.
Example on programming access codes:
ENTER, 9 , 2nd #, 50
Keep ENTER depressed while pressing 0
Release both
The first access code in this example is 9 and the second
50.
AS2574B
Pause Generation
Pause introduces a delay in signalling digits strings to
accommodate second and subsequent dial tones.
Automatic pauses are generated:
- during dialling out from memories when the first digit(s)
in the digit string equal the stored access code(s)
(pause depends on DT input).
- when going Off-hook by pressing LNR, MEM, or M1 -
9 (ACP).
Any pause can be terminated (shortened) prior to time
out by pressing the LNR key or a high level on the DT
input.
During ACP a pause time out, i.e. DT kept low for > 8
sec., will return the device to idle state.
Pauses are storable as digits within a string of any of the
memories by pressing 2nd # during programming.
Multiple pause entries can be stored up to the maximum
length of the digit string (18 digits/data). A pause is not
accepted in location 1 of a digit string.
If more pauses have been stored in succession, they can
all be terminated by one depression of the LNR key or a
high level on the DT pin for ≥ 1.15 sec.
Sliding Cursor Procedure
To accommodate redialling (LNR) behind a PABX wi-
thout using automatic pause generation (storing access
codes), a sliding cursor protocol is implemented. If new
entries match the previous LNR 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 LNR RAM will contain the
new number.
Rev. 1
5 Jan. 1995
5 Page 
Data Sheet
Direct Dial/Abbreviated Dial/Last Number Redial
AS2574B
N
HS = High
Y
Idle
D
MEM
Off-hook
D
Y Diode
3?
2nd D
N
Digit 0 - 9
(M11 - 20)
Direct dial
D (M11 - 20)
D
Direct dial
(M1 - 10)
D LNR
D
Terminate pause
Reset timer
Y
DT high
N ≥ 1.15 sec
H
Pause
4 sec
Hi-Z
DT
pin
L
Executing pause
Starting timer
DIALLING
Y Pause
N
All digits
dialled ?
Y
N
Speech mode
Timer
overflow
Y
N
Postdialling
available
Rev. 1
11
Jan. 1995
11 Page | ||
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| PDF Descargar | [ Datasheet AS2574BN.PDF ] | |
Hoja de datos destacado
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| AS2574B | 20 NUMBER ONE TOUCH DIALLER WITH SERIAL BUS FOR DISPLAY DRIVER | austriamicrosystems AG |
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| AS2574BP | 20 NUMBER ONE TOUCH DIALLER WITH SERIAL BUS FOR DISPLAY DRIVER | austriamicrosystems AG |
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