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參數(shù)資料
| 型號： | HT93214BLT |
| 英文描述： | Tone/Pulse Telephone Dialer |
| 中文描述： | 音頻/脈沖電話撥號器 |
| 文件頁數(shù)： | 4/22頁 |
| 文件大?。?/td> | 284K |
| 代理商： | HT93214BLT |
Pin Description
Pin Name
I/O
Internal
Connection
Description
C1~C8
R1~R5
I/O
CMOS
IN/OUT
These pins form a 5 8 keyboard matrix which can perform
keyboard input detection and dialing specification setting
functions. When on-hook (HKS=high) all the pins are set high.
While off-hook the column group (C1~C8) remains low and the
row group (R1~R5) is set high for key input detection.
An inexpensive single contact 5 8 keyboard can be used as an
input device. Pressing a key connects a single column to a sin-
gle row, and actuates the system oscillator that results in a di-
aling signal output. If more than two keys are pressed at the
same time, no response occurs. The key-in debounce time is
20ms. Refer to the keyboard information for keyboard ar-
rangement and to the functional description for dialing speci-
fication selection.
X1
I
OSCILLATOR
The system oscillator consists of an inverter, a bias resistor
and the necessary load capacitor on chip. Connecting a stan-
dard 3.579545MHz crystal or ceramic resonator to the X1 and
X2 terminals can implement the oscillator function. The oscil-
lator is turned off in the standby mode, and is actuated when-
ever a keyboard entry is detected.
X2
O
XMUTE
O
NMOS OUT
XMUTE is an NMOS open drain structure pulled to VSS dur-
ing dialing signal transmission. Otherwise, it is an open cir-
cuit. XMUTE is used to mute the speech circuit when
transmitting the dial signal.
HKS
I
CMOS IN
This pin is used to monitor the status of the hook-switch and
its combination with HFI can control the PO pin output to
make or break the line.
HKS=VDD: On-hook state (PO=low). Except for HFI/HDI
(hand-free/hold-line control input), other
functions are all disabled.
HKS=VSS:Off-hookstate(PO=high).Thechipisinthestandby
mode and ready to receive the key input.
PO
O
CMOS OUT
This pin is a CMOS output structure which by receiving the
HKS and HFO signals, control the dialer to connect or discon-
nect the telephone line.
PO outputs a low to break the line when HKS is high (on-hook)
and HFO is low (hand-free inactive). PO outputs a high to
make the line when HKS is low (off-hook) or HFO is high or
HDO is high.
During the off-hook state, this pin also outputs the dialing
pulse train in pulse mode dialing. While in the tone mode, this
pin is always high.
HT9320F
4
January 12, 2000
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HT93214BT | Tone/Pulse Telephone Dialer |
| HT93214C | Tone/Pulse Telephone Dialer |
| HT93214CL | Tone/Pulse Telephone Dialer |
| HT93214CLT | Tone/Pulse Telephone Dialer |
| HT93214CT | Tone/Pulse Telephone Dialer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HT93214BT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Tone/Pulse Telephone Dialer |
| HT93214C | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Tone/Pulse Telephone Dialer |
| HT93214CL | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Tone/Pulse Telephone Dialer |
| HT93214CLT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Tone/Pulse Telephone Dialer |
| HT93214CT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Tone/Pulse Telephone Dialer |
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