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參數(shù)資料
| 型號： | AS2574BP |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | 20 NUMBER ONE TOUCH DIALLER WITH SERIAL BUS FOR DISPLAY DRIVER |
| 中文描述： | TELEPHONE DIALER CKT, PDIP28 |
| 封裝： | 0.600 INCH, PLASTIC, DIP-28 |
| 文件頁數(shù)： | 2/24頁 |
| 文件大?。?/td> | 191K |
| 代理商： | AS2574BP |
Data Sheet
AS2574B
Rev. 1
2
Jan. 1995
Pin #
Pin Node
Description
1
2
3
4
OSC2
OSC1
SCL
SDA
C1 - 6
Oscillator pins for ceramic resonator (681 kHz)
The SCL output is used to clock all data into the display driver
The SDA output is used to transfer data into the display driver
Keyboard columns
5 - 10
11 - 15
R1 - 5
Keyboard rows
16
LS
Output for controlling loudhearing and handsfree facilities, active high
(see hook state diagramme)
Mask output, active high during pulsing (make and break period, see timing
diagrammes).
Chip disable input, active low.
17
MASK
18
CD
When CD is low, the circiut is disabled.
If this pin is pulled to V
during Off-hook (indicating a disconnect) for more than
2 sec., the circuit is reset*. If the pin is pulled to V
SS
for less than 2 sec., the
line break is ignored.
Mute output, active high during signalling (see timing diagrammes).
19
MR
20
MT
Transmit mute output, active high when MR is high and when
the
Mute
key has been activated (see timing diagrammes).
Earth recall input/output, active high during ER but when forced to V
DD
,
the flash is enabled.
Dial tone input.
21
ER
22
DT
This input is scanned when invoking ACP or a pause is read in a digit string:
DT pin
Function
Open
Pause duration 4.1 sec
Low
If a high is not detected within 8 sec., the circuit is
reset *
If the pin is high for > 1.15 sec., the pause is termi-
nated and the dialling continued. Noise immunity > 8 ms
* Reset means that dialling is stopped and the circuit returns to standby.
If the circuit was in ACP state, the reset will also return the circuit to idle state.
High
23
DP
Hook switch control, dial pulse and flash output; low during Idle and break
periods and high during off-hook (see timing diagrammes).
Pin Description
Continues…
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