The HT95R43, HT95R44, HT95R45 series of devices forms a new series addition to Holtek’s already comprehensive range of 8-bit Phone MCUs. The new devices have a Program Memory capacity range of 4K to 16K of Program Memory, 1152 or 2112 bytes of Data Memory, 28 or 40 I/O pins, an 8-level stack, two or three internal 16-bit timers, an RTC timer and four external interrupt pins. The device is supplied in both 64-pin LQFP and 80-pin LQFP package types.
The HT95R4x series, with their internal DTMF Receiver and Generator functions, are of course suitable for use in general telecommunication product applications, however their internal CPT (Call Progress Tone) Receiver function will see the devices also finding use in more functionally advanced products. The HT95R4x series also contains a 12-bit D/A converter and an SPI/I2C interface which provide the devices with the capability of implementing voice functions via external communication with external Flash Voice memory. These features yet further expand the range of telecommunication applications for the device range. This application range will extend into product areas such as multi-function phones, cordless phones, answering machines and household security products 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.
HT95R43, HT95R44 Internal Chip Interconnection Diagram
HT95R43, HT95R44 MCU Features:
- MCU operating voltage without CPT Detector
- fSYS= 3.58MHz@ 2.2V~5.5V
- Program Memory: 4K×16 ~ 8K×16
- RAM Data Memory: 1152×8 ~ 2112×8
- 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
HT95R45 Internal Chip Interconnection Diagram
HT95R45 MCU Features:
- Operating voltage:
- fSYS=3.58MHz: 2.2V~5.5V
- fSYS=7.16MHz: 3.0V~5.5V
- fSYS=10.74MHz: 3.0V~5.5V
- fSYS=14.32MHz: 4.5V~5.5V
- Program Memory: 16Kx16
- 2112×8 Data Memory
- 42 bidirectional I/Os with pull-high options
- 2 NMOS output-only lines
- External interrupt input
- Three 16-bit timers with interrupts
- Timer external input
- 8-level stack
- 32768Hz system oscillator
- 32768Hz up to 14.32MHz frequency-up circuit
- Real time clock function
- Watchdog timer function
- PFD driver output
- Serial Interfaces Module: SIM for SPI or I2C
- Internal DTMF generator
- Internal DTMF receiver
- 12-bit Audio DAC output
- Power-down and wake-up feature for power-saving operation: Idle mode, Sleep mode, Green mode and Normal mode
- Up to 0.28us instruction cycle with 14.32MHz system clock at VDD=4.5V~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
- Internal Call Progress Tone (CPT) detector
- 64/80-pin LQFP package
The HT95R4x devices all have high levels of functional integration, low cost, low power consumption and high efficiency. The devices share the same excellent noise rejection characteristics as all other Holtek 8-bit MCU devices, with the inclusion of an internal watchdog timer further enhancing their immunity against malfunction. Holtek of course supplies a full suite of highly functional hardware and software development tools, in which is included a full voice editing function, real-time hardware emulation, full memory/register access, hardware breakpoints with logic setups, full trace analysis functions etc. These all add up to ensure that designers are well equipped for rapid and efficient product development and fast debug time.
