HT95R44/HT95R43 -- I/O Type Phone 8-bit MCU with DTMF Receiver & CPT Detector

General Description

These phone MCUs are a series of 8-bit high performance, RISC architecture microcontroller devices specially 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 require 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 system use. Switched capacitor technology is implemented into the devices to obtain good band pass filter performance characteristics for 305Hz to 640Hz call progress tones which are dual tone multi-frequency signals. When a CPT signal is detected it generates relative envelopes 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 requirements for different areas or countries. These devices are fully supported by the Holtek range of fully functional development and programming tools, providing a means for fast and efficient product development cycles.

Features

  • MCU operating voltage without CPT Detector
    fSYS= 3.58MHz@ 2.2V~5.5V
  • Program Memory: 4Kx16 ~ 8Kx16
  • RAM Data Memory: 1152x8 ~ 2112x8
  • 26 bidirectional I/Os with pull-high options
  • 2 NMOS output-only lines
  • 4 external interrupt input pins
  • Dual 16-bit timers with interrupts
  • Timer external input
  • 8-level stack
  • 32768Hz system oscillator
  • 32768Hz to 3.58MHz frequency-up circuit
  • Real time clock function
  • Watchdog timer function
  • PFD driver output
  • DTMF generator
  • DTMF receiver
  • Power-down and wake-up feature for power-saving
    operation
  • Multiple Operating Modes: Idle mode, Sleep mode,
    Green mode and normal mode
  • Up to 1.117us instruction cycle with 3.58MHz system clock at VDD=2.2V~5.5V
  • Bit manipulation instructions
  • Table read function
  • 63 powerful instructions
  • All instructions executed in 1 or 2 machine cycles
  • Low voltage reset function
  • Supported by comprehensive suite of hardware and
    software tools
  • 64-pin LQFP package

CPT Detector Features

  • Operating voltage: 2.5V~5.5V
  • Low power consumption
  • CPT Band: 305~640Hz detection
  • Good performance:
    -8 ~ -39 dBm at VDD=2.5V
    0 ~ -27 dBm at VDD=5V

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