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參數資料
| 型號： | W91F843AN |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | 23-Flash Memory Tone/Pulse Dialer With Handfree,Hold And Lock Functions(具有23個閃速存儲器、免提、保持和上鎖功能的音頻/脈沖撥號器) |
| 中文描述： | TELEPHONE DIALER CKT, PDIP28 |
| 封裝： | 0.600 INCH, PLASTIC, DIP-28 |
| 文件頁數： | 3/23頁 |
| 文件大小： | 207K |
| 代理商： | W91F843AN |
W91F840N SERIES
Publication Release Date: July 1999
- 3 -
Revision A2
PIN DESCRIPTION
SYMBOL
22-PIN 24-PIN 28-PIN I/O
FUNCTION
Column-
Row
Inputs
1
5
&
18
22
1
5
&
20
24
1
6
&
23
28
I
The keyboard input is compatible with a standard 6
×
6 or 7
×
7 keyboard, an inexpensive single
contact (Form A) keyboard, and electronic input.
In normal operation, any single button can be
pushed to produce dual tone, pulses, or functions.
Activation of two or more buttons will result in no
response except for a single tone.
XT
9
9
10
I
A built-in inverter together with an inexpensive
3.579545 MHz crystal supplies the oscillator. The
oscillator stops when there is no keypad input. The
crystal frequency deviation is 0.02%.
XT
10
10
11
O
Crystal oscillator output pin.
T/P
MUTE
11
11
12
O
The T/P
MUTE
is a conventional CMOS N-channel
open drain output.
The output transistor turns on with a low level
during a dialing sequence (both pulse and tone
mode). Otherwise, it is off.
K
MUTE
17
19
22
O
The K
MUTE
is a conventional CMOS N-channel
open drain output.
Toggle action speech mute control pin by MUTE
key.
Connecting the mode pin to V
SS
places the dialer
in tone mode.
Connecting the mode pin to V
DD
places the dialer
in pulse mode with an M/B ratio of 40:60.
Leaving the mode pin floating places the dialer in
pulse mode with an M/B ratio of 33.3:66.7.
The
HKS
(hook switch) input is used to sense
whether the handset is on-hook or off-hook.
In on-hook state, HKS = 1: chip is in sleeping
mode, no operation.
In off-hook state,
HKS
= 0: chip is enabled for
normal operation.
HKS
pin is pulled to V
DD
by internal resistor.
The key tone output is a conventional CMOS
inverter. The key tone is generated when any valid
key is pressed; the KT pin generates a 1.2 KHz
square wave at 35 mS. When no key is pressed,
the KT pin remains in low state.
MODE
15
17
20
I
HKS
12
14
17
I
KT
(W91F840N/F8
40AN/F842N/F
842AN/F841AN
/F843AN only)
6
6
7
O
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