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參數(shù)資料
| 型號(hào)： | AS2574BP |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | 無(wú)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(yè)數(shù)： | 3/24頁(yè) |
| 文件大?。?/td> | 191K |
| 代理商： | AS2574BP |
第1頁(yè)第2頁(yè)當(dāng)前第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)
Data Sheet
AS2574B
Rev. 1
3
Jan. 1995
Pin Description Continued
Pin #
Pin Node
Description
24
HS
Hook switch input; active high with internal pull-down resistor. Debounce 25 ms.
25
Vss
Negative terminal of power supply.
26
TB
Tone burst output:
LS high
80 ms burst, 8 sec pause
MT high
80 ms burst, 2 sec pause
Only in speech mode
MT+LS high
80 ms burst, 2 sec pause
27
TONE
MF tone output.
An on chip reference voltage provides tone levels independent of the
supply voltage.
A dc path from TONE output is needed to accommodate an external voltage
divider for setting the appropriate tone level.
Frequencies:
Frequency (Hz)
Key Matrix (Hz)
Error (%)
697
770
852
941
1209
1336
1477
1633
row 1
row 2
row 3
row 4
col. 1
col. 2
col. 3
see p. 7
≤
±
0.7%
28
Vdd
Positive terminal of power supply
RECALL
1
2
3
4
5
6
7
8
9
0
*
#
LS
LNR
M9
M1
M2
M3
M4
2ND
MUTE
M5
M6
M7
M8
COLUMN
1
2
3
4
5
6
R
1
2
3
4
5
The keyboard is arranged in a 5 x 6 contact matrix with single pole single throw
contacts (SPST).
Keyboard resistance: Ron < 5 k
; Roff > 5 M
.
ENTER
MEM
M10
Enabled only
when off-hook
Enabled also
when ACP is
active (diode 5
inserted)
Enabled when
CD = high
In off-hook state all keys are
enabled (CD = high)
Keyboard Layout
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