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參數資料
| 型號： | HT9020A |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | Call Progress Tone Decoder & ABR Controller |
| 中文描述： | 呼叫進展音解碼器 |
| 文件頁數： | 9/12頁 |
| 文件大?。?/td> | 477K |
| 代理商： | HT9020A |
ABR controller
Initial state:
RDLO=Hi-Impedance
RDLI=Hi-Impedance
BRE AK =Low
ABRI=Low
If a negative transition is received on the ABR
pin, then the Auto-busy-dial function will be
executed, and the LE D pin will output a 0.86Hz
(duty=0.25) clock. If the device detects a dial
tone, KE Y1 and KE Y2 pins output a 100ms
pulse to trigger the redial key of the telephone
dialer. The dial tone will be ignored after the
redial key is triggered.
If a busy/reorder tone for three successive win-
dows is received or the line signal is off for
30.2secs or a dial tone appears again for more
than 7 secs after the number is dialed-out, the
device will turn on the internal register to im-
plement the following control:
Turn off the filter
BRE AK pin output low for on-hook switch
control
The on-hook timer starts counting the break
time
After the break timer has timed-out, the redial
will be executed again. If the repeat-number
ends, the OVER pin will output a 100ms high
pulse to automatically reset to the initial state.
If the receiver does not answer within 30 cycles,
a ringback tone is produced, and the OVE R pin
will output a 100ms high pulse to automatically
reset to the initial state.
The break time and repeat number setting
SE L 1 SE L 2
R epeat No.
(times)
Break T ime
(seconds)
t
B1
t
B2
0
0
10
62.8
84.9
0
1
10
32.6
34.9
1
0
3
62.8
64.9
1
1
15
4.65
6.97
HT9020
9
21st Aug ’98
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| HT9032 | Calling Line Identification Receiver |
| HT9033 | CAS Tone Detector |
| HT9170 | DTMF Receiver |
| HT9170B | DTMF Receiver |
| HT9170D | DTMF Receiver |
相關代理商/技術參數 |
參數描述 |
|---|---|
| HT9020A(18DIP) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Subscriber Line Metering/Monitoring Circuit |
| HT9020A(18SOIC) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Subscriber Line Metering/Monitoring Circuit |
| HT9020B | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Call Progress Tone Decoder & ABR Controller |
| HT9030 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Calling line identification receiver |
| HT9031(18DIP-A) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Caller Number ID Circuit |
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