HT9020 Datasheet, PDF (1/12 Pages) Holtek Semiconductor Inc – Call Progress Tone Decoder & ABR Controller

HT9020
Call Progress Tone Decoder & ABR Controller
Features
• _{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
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.
Busy redial controller
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.
HT9020A
Operating
Voltage
CPT mode
2.5V~5.5V
ABR mode
2.0V~5.5V
HT9020B
CPT mode
2.5V~5.5V
OSC
Frequency
32768Hz
CPT Decoder
ABR
Repeat Times
ABR
Break Time
Package
Full decoded
3/10/15 times
[2/5/15 by
metal option]
4.65/32.6/62.8 sec
[16.3 sec by
18 DIP/SOP
metal option]
32768Hz CPT envelope only
8 DIP
1
21st Aug ’98