Embedded hardware reference for engineers and makers

STM32F411CEU6 Black Pill (WeAct) Pinout & Reference

44-pin interactive pinout

Interactive pinout and hardware reference for the 44-pin WeAct Studio STM32F411CEU6 Black Pill: 100 MHz ARM Cortex-M4F with hardware FPU/DSP, modern USB Type-C port, selective 5V tolerance, and bottom SOIC-8 SPI Flash footprint.

  • WeAct Studio / Open Source
  • Verified source
  • Updated Sep 2026

Interactive pinout diagramTop

  • GPIO
  • Power
  • Ground
  • Analog
  • Control
  • Bus

Tap a row of pins to see it up close

STM32F411CEU6 Black Pill Pinout Vector DiagramInteractive vector pinout diagram of STM32F411CEU6 Black Pill (top view) showing pin headers, power rails, components, and hardware interfaces.U2USBBOOT0NRSTC13U2Y1Y2KEYPWRSWPB12PB13PB14PB15PA8PA9PA10PA11PA12PA15PB3PB4PB5PB6PB7PB8PB95VGND3V35VGND3V3PB10PB2PB1PB0PA7PA6PA5PA4PA3PA2PA1PA0NRSTPC15PC14PC13VBAT3V3SWDIOSWCLKGND

BOARD SUMMARY

STM32F411CEU6

STM32F411CEU6 Black Pill

STM32F411CEU6

WeAct Studio / Open Source
MCU
STM32F411CEU6
CPU core
ARM Cortex-M4 32-bit RISC with FPU / DSP
Clock speed
100 MHz
SRAM
128 KB
Flash
512 KB
Logic voltage
3.3 V
Form factor
44-pin, USB 2.0 Full-Speed OTG (12 Mbps)

Before you wire

5 V logic — level-shift 3.3 V peripherals

  • Selective 5V Tolerance: Most digital GPIOs are 5V tolerant (FT). However, analog ADC pins (PA0–PA7, PB0, PB1) and PC13–PC15 are strictly limited to 3.3V!
  • Back-power Risk: The 5V pin connects directly to USB Type-C VBUS without back-power isolation. Do not connect an external 5V supply while USB is attached!
  • KEY Button on PA0: User push button SW3 is wired directly to PA0, shorting to GND when pressed (active LOW).
  • USB Pins PA11/PA12: PA11 (D-) and PA12 (D+) are hardwired to the Type-C port via 22Ω damping resistors and cannot be used as general GPIO when USB is active.

QUICK LINKS

Pin table

Showing 44 of 44 pins
STM32F411CEU6 Black Pill pin table: physical pin, name, GPIO, functions, ADC, touch, default role, flags
PinNameGPIOFunctionsADCDefault roleFlags
1 j2PB12—
gpiouarti2cspipwm
—GPIO
2 j2PB13—
gpiospipwm
—GPIO
3 j2PB14—
gpiospipwm
—GPIO
4 j2PB15—
gpiospipwmrtc
—GPIO
5 j2PA8—
gpiouarti2cpwmusb
—GPIO
6 j2PA9—
gpiouarti2cpwm
—GPIOuart_bridge_shared
7 j2PA10—
gpiouartpwm
—GPIOuart_bridge_shared
8 j2PA11—
gpiouartpwmusb
—GPIOonboard_component_shared
9 j2PA12—
gpiouartusb
—GPIOonboard_component_shared
10 j2PA15—
gpiospispipwmswd
—GPIOmanufacturer_discretionary
11 j2PB3—
gpiospispipwmswd
—GPIOmanufacturer_discretionary
12 j2PB4—
gpioi2cspispipwmswd
—GPIOmanufacturer_discretionary
13 j2PB5—
gpioi2cspispipwm
—GPIO
14 j2PB6—
gpiouarti2cpwm
—GPIO
15 j2PB7—
gpiouarti2cpwm
—GPIO
16 j2PB8—
gpioi2cpwmpwm
—GPIO
17 j2PB9—
gpioi2cspipwmpwm
—GPIO
18 j25V—
power
—5.0 V Poweralways_on_power
19 j2GND—
gnd
—Ground
20 j23V3—
power
—3.3 V Power
1 j15V—
power
—5.0 V Poweralways_on_power
2 j1GND—
gnd
—Ground
3 j13V3—
power
—3.3 V Power
4 j1PB10—
gpioi2cspipwm
—GPIO
5 j1PB2—
gpio
—GPIOboot_strapping
6 j1PB1—
gpiopwmpwmadc
ADC1_CH9GPIOvoltage_3v3_strict
7 j1PB0—
gpiopwmpwmadc
ADC1_CH8GPIOvoltage_3v3_strict
8 j1PA7—
gpiospipwmpwmadc
ADC1_CH7GPIOvoltage_3v3_strictflash_psram_reserved
9 j1PA6—
gpiospipwmadc
ADC1_CH6GPIOvoltage_3v3_strictflash_psram_reserved
10 j1PA5—
gpiospipwmadc
ADC1_CH5GPIOvoltage_3v3_strictflash_psram_reserved
11 j1PA4—
gpiouartspiadc
ADC1_CH4GPIOvoltage_3v3_strictflash_psram_reserved
12 j1PA3—
gpiouartpwmpwmadc
ADC1_CH3GPIOvoltage_3v3_strict
13 j1PA2—
gpiouartpwmpwmadc
ADC1_CH2GPIOvoltage_3v3_strict
14 j1PA1—
gpiouartpwmpwmadc
ADC1_CH1GPIOvoltage_3v3_strict
15 j1PA0—
gpiouartpwmpwmadc
ADC1_CH0GPIOvoltage_3v3_strictonboard_component_shared
16 j1NRST—
reset
—Reset / Enablevoltage_3v3_strict
17 j1PC15—
gpiortc
—GPIOvoltage_3v3_strict
18 j1PC14—
gpiortc
—GPIOvoltage_3v3_strict
19 j1PC13—
gpiortc
—GPIOvoltage_3v3_strictonboard_component_shared
20 j1VBAT—
power
—3.3 V Poweralways_on_power
1 swd3V3—
power
—3.3 V Power
2 swdSWDIO—
gpioswdswd
—GPIOmanufacturer_discretionary
3 swdSWCLK—
gpioswdswd
—GPIOmanufacturer_discretionary
4 swdGND—
gnd
—Ground

Grounded reference

Board overview

The WeAct Studio STM32F411CEU6 Black Pill is a high-performance development board featuring a 100 MHz ARM Cortex-M4F core with single-precision FPU, 512 KB Flash, 128 KB SRAM, USB Type-C connector, and a bottom SOIC-8 footprint for external SPI Flash.

Power inputs

  • USB Type-C Port: Delivers 5V (VBUS) power to the onboard 3.3V LDO and provides native Full-Speed USB OTG connectivity.
  • 5V Pins: External 5V power input. CAUTION: Tied directly to USB VBUS without an ideal diode; do not apply external 5V while USB is plugged in!
  • 3.3V Pins: Regulated 3.3V output from onboard AP7343 / ME6211 LDO (up to 300 mA), or direct 3.3V supply input.
  • VBAT Pin: Backup power domain input (1.65–3.6V) preserving RTC operation and backup registers when main power is removed.

Hardware Variants, Clones & Traps

  • F411 vs F401: STM32F411 operates at a higher 100 MHz clock (vs 84 MHz on F401) with double memory capacity (512 KB Flash / 128 KB SRAM vs 256 KB / 64 KB).
  • U3 SPI Flash Footprint: The bottom side includes unpopulated SOIC-8 pads for an external SPI Flash chip (W25Q32–W25Q128) connected to SPI1.
  • ROM DFU Bootloader: The factory ROM bootloader allows firmware flashing directly via USB Type-C without an external ST-Link programmer by holding BOOT0.

Before you wire

  • Selective 5V Tolerance: Most digital GPIOs are 5V tolerant (FT). However, analog ADC pins (PA0–PA7, PB0, PB1) and PC13–PC15 are strictly limited to 3.3V!
  • Back-power Risk: The 5V pin connects directly to USB Type-C VBUS without back-power isolation. Do not connect an external 5V supply while USB is attached!
  • KEY Button on PA0: User push button SW3 is wired directly to PA0, shorting to GND when pressed (active LOW).
  • USB Pins PA11/PA12: PA11 (D-) and PA12 (D+) are hardwired to the Type-C port via 22Ω damping resistors and cannot be used as general GPIO when USB is active.

Specifications

MCU
STM32F411CEU6
CPU core
ARM Cortex-M4 32-bit RISC with FPU / DSP
Clock
100 MHz
SRAM
128 KB
Flash
0.5 MB
GPIO count
32
Logic voltage
3.3 V
Operating voltage (VIN)
3.3 - 5.0 V

Safe GPIO pins

Use the pin table to distinguish 5 V-tolerant digital pins from analog and special-purpose pins limited to 3.3 V.

ADC and analog pins

ADC inputs operate in the analog supply domain and are not 5 V tolerant.

I2C, SPI and UART pins

The board exposes UART, SPI, I2C, I2S, USB, timer, and SWD signals through alternate pin functions.

Strapping and boot pins

BOOT0 controls entry to the ROM bootloader; keep it in the normal state for user flash execution.

Input-only pins

GPIO direction, alternate functions, and voltage tolerance vary by pin; consult the interactive table before wiring.

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