MCU Products

MCU Products

Professional microcontroller solutions for your applications

Overview

The device is a Flash Memory A/D type 8-bit high performance RISC architecture microcontroller which includes a multi-channel 24-bit Delta Sigma A/D converter with Accurate Temperature Sensor, specifically designed for high accuracy measurement products and temperature measurement products.

For memory features, the Flash Memory offers users the convenience of multi-programming features. Other memory includes an area of RAM Data Memory as well as an area of true EEPROM memory for storage of non-volatile data such as serial numbers, calibration data etc.

Analog features include a multi-channel 24-bit Delta Sigma A/D Converter and Operational Amplifier fucntions. Multiple and extremely flexible Timer Modules provide timing, pulse generation and PWM generation functions. Communication with the outside world is catered for by including fully integrated SPI, I2C and UART interface functions, three popular interfaces which provide designers with a means of easy communication with external peripheral hardware. Protective features such as an internal Watchdog Timer, Low Voltage Reset and Low Voltage

Detector coupled with excellent noise immunity and ESD protection ensure that reliable operation is

maintained in hostile electrical environments.

The device also includes fully integrated high and low oscillators which require no external components for their implementation. The ability to operate and switch dynamically between a range of operating modes using different clock sources gives users the ability to optimise microcontroller operation and minimise power consumption.

The inclusion of flexible I/O programming features, Time-Base funcitons along with many other features enhance the versatility of the device to suit for high accuracy measurement products such as electronic scales, blood pressure meters and so on, as well as appropriate for use in ear thermometers, forehead thermometers, electronic thermometers and other temperature measurement products.

Features

24-bit Delta Sigma A/D converter

  • - - bulid in Low Noise Amplifier
  • - - Internal Power Supply
  • - - 2 differential or 4 single-end external channel

Low Power Consumption and Wide Operating Voltage

  • - - Operating voltage: 2.2V ~ 5.5V
  • - - Supports selectable clock sources and power-down modes
  • - - Ideal for battery-powered portable devices

Highly Integrated Memory and Interfaces

  • - - Built-in Flash, RAM, and EEPROM
  • - - Communication interfaces: I²C / SPI / UART
  • - - Supports In-Application Programming (IAP) for firmware updates

Enhanced System Safety and Reliability

  • - - Built-in Watchdog, LVR / LVD
  • - - Strong noise immunity and ESD protection
  • - - Flexible internal/external clock switching

Documents

BH66F5355 Datasheet

QFN24

Includes package dimensions, pad layout, and assembly requirements. Please use it for PCB layout and process evaluation.

SSOP24

Includes package dimensions, pad layout, and assembly requirements. Please use it for PCB layout and process evaluation.

BMHB6005:BH66F5355 Dev Board Resources

Resources

BMHB6005:BH66F5355 Dev Board Resources

BMHB6005 is a development board for Holtek's24-Bit A/D Flash MCU BH67F5355.

Quick Start

BH66F5355 BMHB6005 Dev Board — Quick Start

Platform: BH66F5355 24-Bit A/D Flash MCU Version Date: 2026-06-05

This repository provides customer reference materials for the BMHB6005 generic dev board, including the BH66F5355 Chinese and English datasheets, the board hardware design pack, and the BH66F5355 driver source code.

1. Resource Layout
project-root/
├── 1.docs/                   # Documents and datasheets
├── 2.Code/                   # BH66F5355 driver source code
├── 3.board/                  # Dev board hardware design pack
├── README-pub.md             # Customer quick start (Chinese)
└── README-pub_EN.md          # Customer quick start (English)
2. 1.docs — Documents and Datasheets

1.docs/ contains the Chinese and English BH66F5355 datasheets for chip features, package information, electrical characteristics, and peripheral capabilities.

FileDescription
simBH66F5355v150.pdfBH66F5355 Chinese datasheet
BH66F5355v150.pdfBH66F5355 datasheet
BMHB6005_interface.pngBMHB6005 dev board interface diagram
3. 2.Code — BH66F5355 Driver Source Code

2.Code/BH66F5355_Driver/ can be used as the firmware starting point for BH66F5355 development. It includes board configuration, low-level drivers, application-layer interfaces, and example projects.

PathDescription
2.Code/BH66F5355_Driver/driver/Low-level drivers for ADC24, GPIO, I2C, SPI, UART, PTM, CTM, EEPROM, IAP, WDT, and related peripherals
2.Code/BH66F5355_Driver/board/BoardCfg.hDev board hardware configuration
2.Code/BH66F5355_Driver/application/Application-layer interfaces and IAP / ISP code
2.Code/BH66F5355_Driver/example/Peripheral and system feature examples
4. 3.board — Dev Board Hardware Design Pack

3.board/ contains the BMHB6005 dev board hardware design pack.

FileDescription
BH66F5355_devboard_BMHB6005_V1.5.zipBMHB6005 BH66F5355 Dev Board V1.5 hardware design pack
5. Quick Start Guide
BMHB6005 Interface Diagram
  1. Read the datasheet — start with 1.docs/simBH66F5355v150.pdf or 1.docs/BH66F5355v150.pdf to confirm BH66F5355 electrical specifications, package information, and peripheral capabilities.
  2. Prepare hardware references — use 3.board/BH66F5355_devboard_BMHB6005_V1.5.zip for the dev board schematic, PCB, and related design files.
  3. Prepare source code — use 2.Code/BH66F5355_Driver/ as the firmware starting point, beginning with board/BoardCfg.h and driver/.
  4. Run examples — refer to examples under example/ for ADC24, I2C, SPI, UART, timers, EEPROM, IAP, and other features.
  5. Integration validation — complete peripheral, power, reliability, and production-flow validation on the target hardware before product design or mass-production deployment.
6. Contact
  • Resource pack version: based on the BMHB6005 BH66F5355 generic dev board resources as of 2026-06-05.
  • Technical support: tony@e-besthealth.com
  • Business inquiries: info@e-besthealth.com
  • Website: https://www.e-besthealth.com
  • Address: Office 301, Building 10, Xinzhu Garden, No.4 Xinzhu Road, Songshan Lake, Dongguan, Guangdong, China
  • Phone: +86-769-26261311
7. Disclaimer

The materials in this repository — including hardware schematics, PCB files, source code, and documents — are provided solely for customer reference and evaluation. Before using these materials in product design, mass production, or commercial deployment, customers are responsible for conducting full functional testing, reliability validation, and regulatory certification. BestHealth Electronics Inc. (悠健电子(东莞)有限公司) shall not be liable for any direct or indirect losses arising from the customer's use of these materials in production, sale, or operation — including but not limited to yield issues, field failures, product recalls, or end-customer claims. These materials are provided "as is" without warranty of any kind, express or implied.

8. Intellectual Property

All materials in this repository (including but not limited to hardware design files, source code, documents, trademarks, and logos) are the intellectual property of BestHealth Electronics Inc. (悠健电子(东莞)有限公司), protected by applicable laws. Customers are granted only the right to use these materials for reference and evaluation. Reverse engineering, resale, redistribution, or unauthorized public release is prohibited without prior written consent.

© 2026 BestHealth Electronics Inc. (悠健电子(东莞)有限公司) All Rights Reserved.

Complete Package

BMHB6005 Complete Resource Package

BMHB6005 BH66F5355 Dev Board V1.5 Hardware Design Pack

BH66F5355 Driver Source Code

🔬 Development Stage

Tools for development and debugging

💻 Software

IDE-3000

(IDE Software)

The HT-IDE3000 is a simulation software specially developed for HOLTEK 8-bit MCUs. When used together with OCDS EV chip, it will implement a series of operations such as single step, full speed, breakpoint setting, RAM monitor, etc.

Documents

IDE-3000

The HT-IDE3000 is a simulation software specially developed for HOLTEK 8-bit MCUs. When used together with OCDS EV chip, it will implement a series of operations such as single step, full speed, breakpoint setting, RAM monitor, etc.

HT-IDE3000 User’s Guide

🔧 Hardware

e-LinkPro2

(Debug Hardware)

The e-LinkPro2 function is compatible with the e-Link and which is an online debug adaptor for Holtek's new generation of OCDS architecture Flash MCUs. Together with the HT-IDE3000 software it allows users to program and debug programs on their target boards. The e-LinkPro2 also provides an ICP function for Flash MCUs. When connected to a PC and when used together with the HOPE3000 software the e-LinkPro2 can also be used as a low volume engineering programmer for HT8 Flash MCUs.

Documents

Holtek e-Link for 8-bit MCU OCDS User’s Guide

🏭 Small-scale Production

Tools for small batch programming

💻 Software

IDE-3000

(IDE Software)

The HT-IDE3000 is a simulation software specially developed for HOLTEK 8-bit MCUs. When used together with OCDS EV chip, it will implement a series of operations such as single step, full speed, breakpoint setting, RAM monitor, etc.

Documents

IDE-3000

The HT-IDE3000 is a simulation software specially developed for HOLTEK 8-bit MCUs. When used together with OCDS EV chip, it will implement a series of operations such as single step, full speed, breakpoint setting, RAM monitor, etc.

HT-IDE3000 User’s Guide

HOPE5000

(Programming Software)

The HOPE5000 is a software designed by Holtek for programming MCUs. The software is connected to the writer via a USB cable to transmit the related programming data.

Documents

HOPE5000

The HOPE5000 is a software designed by Holtek for programming MCUs. The software is connected to the writer via a USB cable to transmit the related programming data.

HOPE5000 User guide

🔧 Hardware

e-Socket

(Programming Hardware)

The e-Socket is a socket which is used together with e-WriterPro. MCUs with the same package types can use the same e-Socket for programming. It is not necessary to purchase individual programming adaptors for different MCUs. The e-Socket is designed with a programming counter which enables the e-WriterPro to remind users when to replace the e-Socket with a new one after a certain amount of times. This function is provided to maintain high programming quality.

e-WriterPro2

(Programming Hardware)

The e-WriterPro2 is an upgraded version programmer of the e-WriterPro, which is fully compatible with the previous version, and it can be used not only as a programming tool for all of Holtek’s OTP and Flash devices during development stage but can also be used for small to medium volume production purposes.

🏢 Mass Production

Tools for high-volume manufacturing

💻 Software

IDE-3000

(IDE Software)

The HT-IDE3000 is a simulation software specially developed for HOLTEK 8-bit MCUs. When used together with OCDS EV chip, it will implement a series of operations such as single step, full speed, breakpoint setting, RAM monitor, etc.

Documents

IDE-3000

The HT-IDE3000 is a simulation software specially developed for HOLTEK 8-bit MCUs. When used together with OCDS EV chip, it will implement a series of operations such as single step, full speed, breakpoint setting, RAM monitor, etc.

HT-IDE3000 User’s Guide

🔧 Hardware

GangWriter00-8

(Programming Hardware)

The product is an upgraded gang programmer of Gang-Writer32-8 and Gang-Writer8-8. It is composed of a development board and two programming modules and supports programming both Holtek 8-bit and 32-bit MCUs. Each programming module includes 4 programming interfaces, and one development board can connect up to 4 programming modules. This allows the product to program up to 16 MCUs simultaneously, with support for parallel programming across 2, 4, 6, 8, 12, and 16 sites.

e-Socket

(Programming Hardware)

The e-Socket is a socket which is used together with e-WriterPro. MCUs with the same package types can use the same e-Socket for programming. It is not necessary to purchase individual programming adaptors for different MCUs. The e-Socket is designed with a programming counter which enables the e-WriterPro to remind users when to replace the e-Socket with a new one after a certain amount of times. This function is provided to maintain high programming quality.

e-WriterPro2

(Programming Hardware)

The e-WriterPro2 is an upgraded version programmer of the e-WriterPro, which is fully compatible with the previous version, and it can be used not only as a programming tool for all of Holtek’s OTP and Flash devices during development stage but can also be used for small to medium volume production purposes.

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