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參數(shù)資料
| 型號： | HT93214BL |
| 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)： | 5/22頁 |
| 文件大?。?/td> | 284K |
| 代理商： | HT93214BL |
Pin Name
I/O
Internal
Connection
Description
MODE
I/O
CMOS
IN/OUT
This is a three-state input/output pin, used for dialing mode
selection, either Tone mode or Pulse mode, 10pps/20pps
MODE=VDD: Pulse mode, 10pps
MODE=OPEN: Pulse mode, 20pps
MODE=VSS: Tone mode
During pulse mode dialing, switching this pin to the tone
mode changes the subsequent digit entry to tone mode. When
the chips are in tone mode, switching to pulse mode will also
be recognized.
DTMF
O
CMOS OUT
This pin is active only when the chip transmits tone dialing
signals. Otherwise, it always outputs a low. The pin outputs
tone signals to drive the external transmitter amplifier cir-
cuit. The load resistor should not be less than 5k .
HDI
I
CMOS IN
Pull-high
This pin is a schmitt trigger input structure. Active low. Ap-
plying a negative going pulse to this pin can toggle the HDO
output once.
An external RC network is recommended for input
debouncing. The pull-high resistance is 200k
typ.
HDO
O
CMOS OUT
The HDO is a CMOS output structure. Its output is toggle-
controlled by a negative transition on HDI. When HDO is tog-
gled high, PO keeps high to hold the line. The hold function
can be released by setting HFO high or by an on-off hook oper-
ation or by another HDI input. The HDO pin can directly drive
the HT3810 series melody generator to produce a hold-line
background melody. Refer to the functional description for the
hold-line function section.
HFI
I
CMOS IN
Pull-low
This pin is a schmitt trigger input structure. Active high. Ap-
plying a positive going pulse to HFI can toggle the HFO once
and hence control the hand-free function. The pull-low resis-
tance of HFI is 200k
typ.
An external RC network is recommended for input
debouncing.
HFO
O
CMOS OUT
The HFO is a CMOS output structure. Its output is toggle-
controlled by a positive transition on HFI pin. When HFO is
high, the hand-free function is enabled and PO outputs a high
to connect the line.
The hand-free function can be released by an on-off-hook oper-
ation or by another HFI input or by setting HDO high. Refer to
the functional description for the hand-free function opera-
tion.
DOUT
O
NMOS OUT
NMOS open drain output pin. It outputs the BCD code of the
dialing digits to the LCD driver chip (HT16XX series) or to the
C for dialing number display. Refer to the functional descrip-
tion for the detailed timing.
HT9320F
5
January 12, 2000
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HT93214BLT | Tone/Pulse Telephone Dialer |
| HT93214BT | Tone/Pulse Telephone Dialer |
| HT93214C | Tone/Pulse Telephone Dialer |
| HT93214CL | Tone/Pulse Telephone Dialer |
| HT93214CLT | Tone/Pulse Telephone Dialer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HT93214BLT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Tone/Pulse Telephone Dialer |
| 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 |
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