HT9020
Call Progress Tone Decoder & ABR Controller
Features
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Low cost 32768Hz crystal
Low power consumption
Operating voltage: 2.5V to 5.5V (CPT mode)
2.0V to 5.5V (ABR mode)
Call progress tone decoder
–
Fully decoded tristate call progress status
output
–
Works with traditional precision or PBX call
progress tones
Busy redial controller
–
Repeat times: 3, 10 or 15 times
( 2, 5, 15 times by mask option)
–
4.65, 32.6 and 62.8 sec break time
(16.3sec by mask option)
–
Auto-terminate after 30 times (default)
ringback tone receipt
General Description
The HT9020 provides two modes; Call progress
tone decoder and Busy redial controller, to sup-
port the application fields.
Standard call progress tone decoder
Busy redial controller
This feature detects a specified input signal and
then outputs relative envelopes during a 2.32sec
interval. Three tristate output pins (DIAL, RBK,
BUSY) indicate the presence of a dial tone, ring-
back tone or busy/reorder tone respectively, so it
provides information that enables the microproc-
essor to decide whether to initiate, continue or
terminate calls.
This feature implements a busy redial function.
After decoding, if the line is busy, this device
forces the dialer to break for 62.8 sec, then
triggers the redial key after the dial tone re-
ceipt. If the receiver is still busy, the redial
sequence will be repeated 10 times. If the re-
ceiver is ringing, the redial sequence will be
terminated after 30 times of ringback tone re-
ceipt.
Selection Table
Function
Part No.
Operating
Voltage
CPT mode
2.5V~5.5V
ABR mode
2.0V~5.5V
CPT mode
2.5V~5.5V
OSC
Frequency
CPT Decoder
ABR
Repeat Times
3/10/15 times
[2/5/15 by
metal option]
ABR
Break Time
4.65/32.6/62.8 sec
[16.3 sec by
metal option]
Package
HT9020A
32768Hz
Full decoded
18 DIP/SOP
HT9020B
32768Hz
CPT envelope only
8 DIP
1
21st Aug ’98
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
