STM32F103C8T6 MCU Minimum System Board [CHN ST Chip]

SKU: FA1075-1
Microcontroller

STM32F103C8T6 (ARM Cortex-M3)
Maximum Clock Speed

72 MHz
Flash Memory

64 KB
SRAM

20 KB
GPIO Count

37 pins
Operating Voltage

2.0V – 3.6V
ADC

2×12-bit, up to 10 channels
Package / Debug

LQFP-48 / SWD, USB DFU

The STM32F103C8T6 MCU Minimum System Board is a compact, proven development platform built around the STM32F103C8T6 microcontroller. Often referred to as the “Blue Pill” in the maker community, this board has become one of the most widely used entry points into the STM32 ecosystem due to its low cost, rich peripherals, and extensive community support.

This version uses the CHN ST chip, a China-manufactured variant of the STM32F103C8T6. It offers the same core architecture, pinout, and peripheral set as the original, providing a cost-effective alternative for budget-conscious projects, educational use, and volume deployment where the genuine imported chip is not required.

At its heart is an ARM Cortex-M3 32-bit RISC core running at up to 72 MHz, delivering approximately 1.25 DMIPS/MHz of processing power. The chip integrates 64 KB of Flash memory and 20 KB of SRAM, providing sufficient space for control logic, communication stacks, and moderate data processing tasks. A 2×12-bit ADC with up to 10 channels handles analog sensor inputs, while USART, SPI, I2C, and CAN interfaces provide connectivity to a wide range of peripherals and modules.

The board follows a minimum system design, exposing all available GPIO pins on standard 0.1-inch headers on both sides. This makes it ideal for breadboard prototyping and easy integration into custom setups. Two onboard jumpers allow you to select the boot mode (BOOT0 and BOOT1), and a Micro USB port provides both power and programming via the built-in USB bootloader. A reset button and power LED complete the essential controls.

The STM32F103C8T6 is supported by STM32CubeIDE, ST’s free integrated development environment, as well as Keil MDK and IAR toolchains. The board can be programmed via SWD (Serial Wire Debug) using an external ST-Link programmer, or through the USB DFU bootloader without additional hardware. For developers familiar with Arduino, community-maintained cores allow the board to be programmed through the Arduino IDE as well.

Whether you are learning ARM embedded development, building a motor control system, creating a data logger, or prototyping a connected device, the STM32F103C8T6 Minimum System Board offers a reliable, affordable foundation. It is suitable for individual makers, students, and businesses purchasing in bulk for education, research, or product development.

Features

  • ARM Cortex-M3 @ 72 MHz — Proven 32-bit processing performance for a wide range of embedded applications.

  • 64 KB Flash / 20 KB SRAM — Sufficient memory for control logic and communication stacks.

  • CHN ST chip — Cost-effective alternative with the same core architecture and pinout as the original.

  • Full pin breakout — All GPIOs exposed on standard 0.1″ headers for breadboard and custom integration.

  • Multiple communication interfaces — USART, SPI, I2C, and CAN for connecting peripherals and modules.

  • 2×12-bit ADC (10 channels) — For analog sensor reading and signal measurement.

  • Micro USB port — Provides power and supports USB DFU bootloader programming.

  • SWD debug interface — Standard programming and debugging via external ST-Link programmer.

  • Boot mode jumpers — Configurable BOOT0 and BOOT1 for flexible boot options.

  • Compact breadboard-friendly form factor — 53mm × 22mm, ideal for prototyping.

Technical Specifications 

# Parameter Specification
1 Microcontroller STM32F103C8T6 (ARM Cortex-M3)
2 Maximum Clock Speed 72 MHz
3 Flash Memory 64 KB
4 SRAM 20 KB
5 GPIO Count 37 pins
6 Operating Voltage 2.0V – 3.6V
7 ADC 2×12-bit, up to 10 channels
8 Package / Debug LQFP-48 / SWD, USB DFU

Getting Started

  1. Power the board — Connect via the Micro USB port or supply 3.3V through the header pins. The onboard regulator accepts 5V from USB.

  2. Connect a debugger — Use an ST-Link v2 or compatible programmer connected to the SWD interface (SWDIO, SWCLK, GND, 3.3V).

  3. Set up the development environment — Install STM32CubeIDE (free from ST), Keil MDK, or IAR. For Arduino users, install the STM32duino core.

  4. Configure peripherals — Use the built-in CubeMX graphical tool to assign pins, enable peripherals, and set clock speeds.

  5. Write your code — Add application logic in the designated user code sections.

  6. Flash and debug — Build the project and program the chip via SWD or the USB DFU bootloader.

Programming Options

  • SWD (recommended) — Use an ST-Link programmer for full debugging capability.

  • USB DFU bootloader — Set BOOT0 to 1, connect via USB, and use STM32CubeProgrammer to flash.

  • Arduino IDE — Install the STM32duino core and program via USB or ST-Link.

Typical Applications

  • Learning ARM embedded development — A low-cost, well-documented entry point to 32-bit ARM.

  • Motor control and robotics — Advanced timers and PWM for servo and motor control.

  • Data acquisition and logging — Multiple ADC channels and communication interfaces for sensor projects.

  • Industrial control — CAN interface for equipment and automation networks.

  • IoT and connected devices — USART, SPI, and I2C for wireless modules and sensors.

  • Breadboard prototyping — Compact form factor integrates easily into breadboard setups.

  • Educational kits — Cost-effective platform for classroom and workshop teaching.

  • OEM and product development — Proven MCU for commercial designs and volume production.

Notes for Business Buyers

  • Cost-effective CHN ST chip — Provides the same core architecture and pinout at a lower price point for budget-sensitive applications.

  • Standard ARM toolchain support — STM32CubeIDE, Keil MDK, IAR, and Arduino IDE (via STM32duino) are all supported.

  • Full pin access supports custom integration — All GPIOs are exposed for use as a core module in larger systems.

  • Suitable for bulk deployment — Ideal for educational institutions, research labs, and product development teams.

Q: Is this board the same as the "Blue Pill"?

Yes. The STM32F103C8T6 Minimum System Board is commonly known as the “Blue Pill” due to its blue PCB color. This version uses the CHN ST chip.

Q: What is the difference between the CHN ST chip and the imported ST chip?

The CHN ST chip is a China-manufactured variant of the STM32F103C8T6. It offers the same core architecture, pinout, and peripheral set, but at a lower cost. For most applications, it is functionally equivalent.

Q: Does this board come with a built-in programmer?

No. The board does not include an onboard ST-Link. You need an external ST-Link v2 programmer for SWD programming, or you can use the USB DFU bootloader without additional hardware.

Q: What software do I need to program this board?

You can use STM32CubeIDE (free from ST), Keil MDK-ARM, IAR Embedded Workbench, or the Arduino IDE with the STM32duino core installed.

Q: Can I use the Arduino IDE with this board?

Yes. The STM32duino core (also known as Arduino_Core_STM32) supports the STM32F103C8T6. You can program it via USB DFU or ST-Link.

Q: How do I connect the ST-Link programmer to the board?

Connect four wires: SWDIO (data), SWCLK (clock), GND, and 3.3V. The board has a dedicated 4-pin SWD header for this purpose.

Q: What is the difference between this board and an Arduino Uno?

The STM32F103C8T6 is a 32-bit ARM Cortex-M3 running at 72 MHz, compared to the Arduino Uno’s 8-bit ATmega328P at 16 MHz. It offers significantly more processing power, memory, and peripherals.

Q: Can I use 5V sensors with this board?

Many of the GPIO pins are 5V-tolerant, meaning they can accept 5V logic signals without damage. However, the board itself operates at 3.3V for power.

Q: How much memory does the board have?

It has 64 KB of Flash for program storage and 20 KB of SRAM for runtime data.

Q: Can I purchase in bulk for a school or company?

Yes. This board is suitable for both individual users and business purchasing, including classroom kits, evaluation labs, and volume production. Its low unit cost makes it particularly attractive for educational and cost-sensitive applications.

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