STM32 pinout: A Complete Guide On The Microcontroller

Microcontrollers are shaping the world of electronics in different ways. You find them in various fields like robotics, automotive applications, etc. For this reason, finding one just as affordable as it is effective is of enormous advantage. One suitable type of microcontroller is the STM32 pinout.

Hence, using this type of microcontroller discovery board makes more sense if you are a beginner in building engineering projects. Moreover, when experimenting on engineering projects,  you need something cheap and easy-to-use with excellent power efficiency. So reading on, you find a complete guide on the STM32 pinout and how to use it.

An STM32 microcontroller chip

(An STM32 microcontroller chip).

STM32 Pinout Configuration.

The STM32 pinout is a Nucleo board from STMicroelectronics. To an extent, it is pretty low in cost and easy-to-use relatively.

The STM32 blue pill diagram is fully labeled

(The STM32 blue pill diagram is fully labeled).

The STM32 Nucleo F401RE development board, for example, comes with an ARM 32-bit cortex microcontroller. This microcontroller often comes in a single LQFP64 package without a separate probe. 

Moreover, there is an inbuilt debug interface/debug port and ST-LINK header/V2-1 programmer for memory access and transmissions. Some examples include the ARM Cortex-M4F core, ARM Cortex-M33 core, ARM Cortex-M3 core, and ARM Cortex-M7F core.

Although similar to Arduino Uno, the STM32 pinout has extra pins on board for increased performance. As a result, this board is doing very well commercially. 

In general, the STM32 pin setup is of two types. On one side, the male pins for the STM itself.

On the other hand, are the female pins for Arduino connection. Hence, it is possible to connect different Arduino headers because of its extension pin headers.

As part of its configuration, the STM32 pinout has three LEDs:

  • LD 1 or first LED– This serves as an indicator for USB connection and communication.
  • The LD 2 or second LED – This indicator is the programmable user LED.
  • LD 3 or third LED – On this end is the power supply indicator.

In the same way, there are two PUSH buttons with separate adequate functions. One of which is for programming the microcontroller as a user. The RESET button, on the other hand, has an alternate position.

Often, the programming board uses an input voltage of 3.3V. Although a voltage ranging from 7-12V is still suitable when supplying through the Vin pin because it has an analog voltage regulator.

Nucleo-F401RE Pinout Configuration

To further understand the STM132, let us discuss the Nucleo F401RE pinout configuration.

As mentioned earlier, there are two sets of pins in the STM132 Nucleo board pinout diagram.

On the one hand, you have the Arduino shield pins.

On the other hand, there are morpho pins connecting the STM132 module. 

There are the CN5, CN6, CN8, and CN9 categories for the Arduino pins. As well, we have tabulated each pin category to describe it better.

GPIO Pinout configuration.

On the other end, the developer board has a set of GPIO pins. The GPIO pins, in this case, function as male headers. These headers make up 76 pins in total.

Further, we classify the GPIO pins into CN7 and CN10, each having 38 on each side. You find the GPIO pins, timer pins, ground pins, power pins, and analog pins.   

Technical Specifications

The technical specs of STM132 are in different categories. As a result, find the interior features of the development board highlighted below:

  • Architecture – ARM Cortex M4 CPU with FPU.
  • Microcontroller – STM32F401RET6 (32-bit).
  • CPU Frequency – 84 MHz.
  • Power consumption – 2.4uA when on standby without RTC. Excellent power efficiency. 
  • Crystal Oscillator Range – From 4 up to 26 MHz.
  • Board Operating Voltage Range (VIN) – Ranges from 7V to 15V.
  • MCU Operating Voltage Range (VDD) – Ranging from 1.7V to 3.6V.
  • SRAM – 96 KB.
  • Flash Memory – 512KB
  • GPIO Pins – 50.
  • ADC – 12-bit, 16Channel.
  • Timers – 16-bit (6), 32-bit (2).
  • Watchdog Timers – 2.
  • RTC – Calibrated with in-built 32kHz.
  • SPI Communication – 3.
  • I2C Communication – 3.
  • USART/UART Communication – 4.
  • On-Board Debugger – Yes, JTAG and Serial Wire.
  • USB port Support – Yes.
  • Internal Crystal Oscillator – Yes, 16MHz.
  • External Oscillator Range – 4MHz to 26 MHz.

Similar Development Boards

Other series of panels similar to the STM132 include

  • Arduino UNO.
  • Arduino Due.
  • The Arduino Leonardo.
  • Arduino Pro Mini.
  • Arduino Mega.
  • Raspberry Pi.
  • AVR Development Board. 
  • PIC Development Board.
  • Intel Edison. 
  • ESP32.
  • MSP430 Launchpad.
  • STM32F4 Discovery Board.

(The Arduino Uno microcontroller).

STM32 Nucleo Boards and how to program them

Getting started with the STM Nucleo Boards is pretty straightforward. There are pretty enough research materials available to help you in most cases. On another note, there is an inbuilt debugger and programming chip. So, it is relatively easier to program these boards.

As a result, we enlist some integrated development environments to aid your programming experience to that effect. These include

  • IDE based on GCC.
  • IAR Workbench
  • Online ARM Mbed
  • Keil MDK-ARM

The above-listed advanced software in different ways. However, Keil MDK remains the most popular software tool.

The Keil MDK, for example, is easy for programming beginners. Also, programmers prefer the development toolchain because it is inexpensive. You only need to download and install the IDE file and the corresponding driver from their official website.

Applications of STM32

Like most Nucleo development boards, the STM32 has substantial commercial and industrial importance. Thus, we give you the most significant applications:

  • First, STM32 is useful in robotics and related projects.
  • Secondly, it is essential in automated systems.
  • Lastly, the STM32 Nucleo F401RE board is popular in the IoT system.

(An automobile robot powered with a microcontroller).


The STM32 pinout is among a series of 32-bit microcontroller chips. Electronic hobbyists, most times, prefer the STM32 for its affordability, excellent power efficiency, and straightforward application programming interface. Also, the STM32 comes in many variants and allows for multiple functions. Overall, its microarchitecture uses the ARM processor cores. 

With this guide, you are ready to go the extra mile to build related engineering projects. Therefore, if you need further guidance or resources, do contact us.

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Emma Lu
Our professional engineering support saves our customers a lot of trouble and loss. >>>>>> After you place the order, our engineer will conduct technical reviews to make sure the parts can be mounted well/correctly on the boards. We will check if the component packages match well with the Gerber footprints, if the part numbers you provided match well with the descriptions, and if the polarity is clearly marked. >>>>> When your design is ready, please send your Gerber and BOM so we can quote and start!