Introduction

As the demand for high-efficiency and compact motor-control solutions continues to grow in power tools, garden equipment, fans, and pump applications, engineers are turning to more integrated BLDC motor control MCUs to simplify design and accelerate time-to-market.
To address these market needs, Holtek has launched two new BLDC MCUs—HT32F65533G and HT32F65733G—built on the Arm® Cortex®-M0+ core with rich analog and motor-control features.

These new devices target lithium-battery powered and low-/medium-voltage DC systems, delivering a reliable, cost-effective, and compact solution ideal for next-generation motor products.

Key Highlights of HT32F65533G & HT32F65733G

1. Built for Low-Voltage & Battery-Powered BLDC Applications

    *  T32F65533G: Integrated 48V N/N pre-driver

    *  HT32F65733G: Integrated 110V N/N pre-driver

    *  On-chip 5V LDO for simplified board design
       These features reduce external components and cost while improving design reliability.

2. Optimized for High-Performance Motor Control

Both MCUs include:

    *  60 MHz Cortex-M0+ core

    *  2 Msps 12-bit ADC (ideal for FOC current sampling)

    *  2 PGAs, 1 OPA, and 2 comparators

    *  Motor-dedicated timers: MCTM, GPTM, SCTM, BFTM

They support:

    *  Sensorless BLDC control

    *  Hall BLDC control

    *  1-shunt / 2-shunt FOC

    *  Traditional square-wave (trapezoidal) control

This makes the devices suitable for both entry-level and advanced motor control architectures.

3. Integrated Communication Interfaces

    *  UART / USART

    *  I²C

    *  SPI

These allow seamless connection with displays, battery packs, sensors, and wireless modules — essential for today’s smart tools and home appliances.

Technical Specifications Overview

HT32F65533G

    *  Input Voltage: 6 V–40 V

    *  Flash / SRAM: 32 KB / 8 KB

    *  ADC: 2 Msps ×1, 12-bit ×12 channels

    *  Timers: BFTM×2, SCTM×4, GPTM×1, MCTM×1

    *  PWM Outputs: 12 channels

    *  Communication: USART×1, UART×1, SPI×1, I²C×1

    *  Package Options: 32-QFN, 48-LQFP-EP

HT32F65733G

    *  Input Voltage: 6 V–20 V

    *  Flash / SRAM: 32 KB / 8 KB

    *  ADC: 2 Msps ×1, 12-bit ×12 channels

    *  PWM Outputs: 12 channels

    *  Communication: UART×1, SPI×1, I²C×1

    *  Package Options: 46-QFN, 48-LQFP-EP

Applications

The Holtek HT32F65533G/HT32F65733G series is ideal for:

    *  Power tools (drills, impact drivers, grinders)

    *  Garden tools (hedge trimmers, blowers, lawn equipment)

    *  Home appliances (fans, vacuum cleaners, air purifiers)

    *  Water and fluid pumps

    *  Battery-powered handheld devices

With integrated pre-drivers and analog front-end components, these MCUs significantly reduce BOM cost and PCB footprint—perfect for compact motor designs.

Holtek Development Platform Support

Holtek provides a complete HT32 BLDC development ecosystem, including:

    *  Hardware evaluation boards

    *  Firmware libraries (HAL-level motor control functions)

    *  FOC and square-wave motor control examples

    *  Application notes and tuning guidelines

This allows engineers to prototype faster, optimize performance, and accelerate mass production.

Conclusion

The HT32F65533G and HT32F65733G bring a new level of integration and performance to BLDC motor control. With built-in pre-drivers, high-speed ADC, rich timers, and flexible interfaces, these MCUs are an excellent choice for power tools, garden tools, and low-voltage BLDC applications.

For developers seeking a compact, reliable, and cost-optimized BLDC motor control solution, Holtek’s latest MCUs offer an exceptional balance of performance and integration.