HT95R44/HT95R43

I/O Type Phone 8-bit MCU with DTMF Receiver & CPT Detector

Rev. 1.00

1

March 31, 2010

Features

MCU Features

operation

Green mode and normal mode

software tools

CPT Detector Features

General Description

These phone MCUs are a series of 8-bit high perfor-

mance, RISC architecture microcontroller devices spe-

cially designed for telephone applications. Device

flexibility is enhanced with their internal special features

such as power-down and wake-up functions, DTMF

generator, DTMF receiver, CPT detector, PFD driver,

etc. These features combine to ensure applications re-

quire a minimum of external components and therefore

reduce overall product costs.

Having the advantages of low-power consumption,

high-performance, I/O flexibility as well as low-cost,

these devices have the versatility to suit a wide range of

application possibilities such as DTMF mode Caller ID

phone, Home Security products, deluxe feature phones,

cordless phones, fax and answering machines, etc.

The call progress tone detector is for Auto-dialing sys-

tem use. Switched capacitor technology is implemented

into the devices to obtain good band pass filter perfor-

mance characteristics for 305Hz to 640Hz call progress

tones which are dual tone multi-frequency signals.

When a CPT signal is detected it generates relative en-

velopes for the microcontroller to determine whether to

finish different kinds of CPT signal detections such as

dial tones, busy tones, ring-back tones and reorder

tones.

These devices will be ideally suited for phone products

that comply with versatile dialer specification require-

ments for different areas or countries. These devices are

fully supported by the Holtek range of fully functional de-

velopment and programming tools, providing a means for

fast and efficient product development cycles.