Holtek Semiconductor HT9020
The HT9020 provides two modes; Call progress tone decoder and Busy redial controller, to support the application fields. This feature implements a busy redial function.| Part No. | HT9020 |
|---|---|
| Datasheet | HT9020 Download |
| Manufacturer |  Holtek Semiconductor |
| Description | Call Progress Tone Decoder & ABR Controller |
| Buy | Stock & Price |
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
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, ringback tone or busy/reorder tone respectively, so it provides information that enables the microprocessor 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 receipt.
