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Holtek HT86Axx New A/D type Voice Series MCUs

Holtek Semiconductor » HT86A36, HT86A72, HT86AR72

Holtek is pleased to announce the release of its new series of A/D type Voice microcontrollers. Within this new range are included the HT86A36, HT86A72, and HT86AR72 devices offering the users a wide range of voice capacities of 36 and 72 seconds as well as Voice ROM capacities of 96Kbyte and 192Kbyte. The HT86AR72 is an OTP type MCU which can be used as a development device for both the HT86A36 and HT86A72 during product design.

The HT86Axx series includes a Holtek 8-bit MCU core, a high resolution single channel audio 12-bit DAC, a 1.0W Power AMP for direct speaker driving as well as a 4-channel 12-bit Analog to Digital Converter and RTC function. The HT86Axx series is not only suitable for applications such as high level toys and voice broadcast equipment, but by having an internal RTC wake-up function will also find applications in products with low power consumption requirements. The inclusion of a fully integrated 1.0W Power amplifier ensures that the requirements on external components are kept to a bare minimum.


  • HT86AXX Operating voltage: 2.0V~5.5V
  • HT86ARXX Operating voltage: 2.2V~5.5V
  • System clock: 4MHz~8MHz
  • Crystal and RC system oscillator
  • 40 I/O pins
  • 8K×16-bit Program Memory
  • 384×8-bit Data Memory
  • 768/1536K-bit voice ROM size
  • 36/72 sec voice length
  • External interrupt input
  • 12-bit high quality voltage type D/A output
  • 4 channels 12-bit resolution A/D Converter
  • SPI series protocol interface
  • Integrated 1W power amplifier to drive 8 ohm Speaker
  • Four 8-bit programmable Timer with overflow interrupt and 7-stage prescaler
  • One optional 32768Hz crystal oscillator for RTC time base
  • 8-bit counter with 3-bit prescaler
  • Watchdog timer function
  • 8-level subroutine nesting
  • Low voltage reset and low voltage detect function
  • Integrated voice ROM with various capacities
  • Power-down function and wake-up feature reduce power consumption
  • Up to 0.5us instruction cycle with 8MHz system clock at VDD= 5V
  • 63 powerful instructions
  • 44-pin QFP and 64-pin LQFP packages

The special features of this new series of voice devices lie in their high sound quality, low power consumption, low cost etc. giving them superiority over anything else on the market. Their internal power amplifier’s direct speaker driving capability, the low demand on external components, excellent noise immunity and wide temperature range of -40°C~+85°C, render the devices extremely suitable for products such as exercising equipments, tire pressure gauges, smoke detectors, high-level toys, voice broadcast equipment etc. Using the HT86Axx in their product design series enables all of these product applications to easily implement voice functions.

In the area of development tools, the HT86Axx series of MCUs includes both assembler and C-language programming support, which together with Holtek’s comprehensive HT-ICE development environment, ensures that designers have a full suite of hardware and software tools at their disposal for rapid product development.

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