Item specifics
Description
The STM32F401CCU6 is a Cortex-M4 dynamic efficiency MCU from STMicroelectronics in an UFQFPN-48 package (7×7 mm). It runs at 84 MHz with FPU and ART Accelerator. It integrates 256 KB Flash, 64 KB SRAM, USB 2.0 OTG (FS/HS), SDIO, 4 SPIs, 3 USARTs, 3 I2Cs, up to 11 timers (incl. 1 motor control PWM/deadtime), and a 12-bit ADC (10ch, 2.4MSPS). 36 I/Os, all 5 V-tolerant. Supply 1.7–3.6 V, -40–85 °C. Compared to the STM32F103C8T6 (Cortex-M3, 72 MHz, 64 KB Flash), this model upgrades to a Cortex-M4 core with FPU, offers higher frequency, doubled Flash and SRAM, and adds USB OTG HS/FS and SDIO, delivering exceptional value. It serves as the core MCU for the well-known "Black Pill" development board.
Core: Arm Cortex-M4 84 MHz + FPU + ART Accelerator Memory: 256 KB Flash, 64 KB SRAM USB 2.0 OTG: FS + HS, FS on-chip PHY, HS requires external ULPI SDIO: SD/MMC card interface support 12-bit ADC: 10 channels, 2.4 MSPS (7.2 MSPS interleaved) Timers: 1× motor control PWM (deadtime/emergency stop), 6× 16-bit GP (incl. 2 quadrature encoders), 2× watchdogs, SysTick Communication Interfaces: 3×USART (ISO7816/LIN/IrDA), 4×SPI/I2S, 3×I2C (SMBus), USB OTG, SDIO I/Os: 36, all 5 V-tolerant Low Power: Sleep/Stop/Standby, VBAT backup RTC Package: UFQFPN-48 (7×7×0.55 mm)
Industrial: Sensor transmitters, data acquisition nodes Motor Control: BLDC/PMSM FOC, fans, pumps Consumer: Game controllers, remote controls, drone flight controllers IoT Nodes USB OTG/SDIO Storage Applications High-Performance Upgrades from Legacy 8/16-bit MCUs
Cortex-M4 + FPU + ART Accelerator: 84 MHz high performance with DSP and floating-point support 256 KB Flash + 64 KB SRAM: Ample memory for complex applications USB OTG HS/FS + SDIO: High-speed USB and SD card storage UFQFPN-48 Ultra-Compact Package: 7×7 mm, 36 I/Os, ideal for space-constrained designs 12-bit ADC 2.4 MSPS Fast Conversion Mature STM32 Ecosystem: CubeIDE/CubeMX/HAL/LL, rich development board support (e.g., Black Pill)
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FAQ:
What is the STM32F401CCU6 and why is it often called the “Black Pill” chip?
The STM32F401CCU6 is an 84 MHz Arm Cortex‑M4F microcontroller with 256 KB Flash and 64 KB SRAM, packaged in a tiny UFQFPN‑48 body. It includes a full‑speed USB OTG controller with an integrated PHY. Its low cost, compact size, and excellent Arduino support have made it the core of the popular “Black Pill” development board, widely used by hobbyists and professionals alike for USB‑connected gadgets and space‑constrained designs.
How does the STM32F401CCU6 differ from the STM32F401CBU6? Which one should I pick?
Both share the same 84 MHz core, 64 KB SRAM, and UFQFPN‑48 package. The only difference is Flash size: the CCU6 offers 256 KB, while the CBU6 has 128 KB. All other features—USB OTG FS, SPI, I2C, USART—are identical. Choose the CCU6 when you need extra room for a larger firmware, richer features, or future over‑the‑air updates. The CBU6 is a slightly more cost‑sensitive option for very compact code bases.
Is 256 KB Flash and 64 KB SRAM enough for a real‑time OS, USB stack, and application code?
Absolutely. A lightweight RTOS (FreeRTOS), a USB device stack, and a typical sensor‑control program fit easily into 256 KB, often with room to spare. The 64 KB SRAM is sufficient for system stacks, DMA buffers, and moderate data processing. This is the exact configuration used in countless commercial USB dongles, portable loggers, and motor controllers.
How does the STM32F401CCU6 compare with the STM32F411CEU6? When should I spend more for the F411?
The STM32F411CEU6 runs at 100 MHz, offers 512 KB Flash and 128 KB SRAM, and adds an extra SPI. The F401CCU6 is slower and has less memory, but it is also more power‑efficient and lower in cost. If your application fits comfortably within 256 KB and 64 KB, the F401CCU6 is the wiser economic choice. Move to the F411 only when you need the additional performance or memory headroom.
Can the STM32F401CCU6 handle USB audio or a virtual COM port? Does it support USB high‑speed?
It provides a full‑speed USB OTG controller with an on‑chip PHY (12 Mbps), which is perfectly adequate for USB Audio Class 1, virtual COM ports, HID devices, and mass‑storage applications. There is no high‑speed ULPI interface. The 256 KB Flash and 64 KB SRAM can comfortably host a USB stack and basic DSP processing, making it a popular choice for USB‑to‑serial converters and simple audio interfaces.
How power‑efficient is the STM32F401CCU6? Can I use it in a battery‑powered device?
It is one of the most energy‑efficient members of the STM32F4 family. In Stop mode with the main regulator off and all 64 KB SRAM retained, the typical current is around 100 µA. Wake‑up is fast, and the 84 MHz core can quickly finish tasks and return to sleep. A dedicated VBAT pin keeps the RTC alive from a coin cell, making it ideal for portable sensors and battery‑powered wearables.
Can I program the STM32F401CCU6 with the Arduino IDE? How easy is it to get started?
Yes, it is fully supported by the STM32duino project (Arduino Core for STM32). Simply install the STM32 board package in the Arduino IDE, select a “Black Pill F401CC” or generic STM32F4 board, and upload code via the on‑chip USB DFU bootloader or an ST‑Link programmer. This makes it one of the easiest Cortex‑M4 chips to start prototyping with.
Is there an official Nucleo board for the STM32F401CCU6? How can I prototype?
There is no Nucleo board that uses the exact 48‑pin UFQFPN‑48 package, but the NUCLEO‑F401RE (64‑pin) is fully software‑compatible. You can develop firmware on the Nucleo and then move to a low‑cost Black Pill or custom PCB with the CCU6. Only the linker script needs to reflect the 256 KB Flash.
Can the STM32F401CCU6 be used for motor control or digital signal processing?
Yes. The Cortex‑M4F core includes a single‑precision FPU and DSP instructions. Advanced‑control timers with complementary PWM outputs and programmable dead‑time insertion enable single‑axis motor drives. The 12‑bit ADC (up to 2.4 Msps) provides accurate current feedback. Many sensorless FOC and digital power converters run comfortably on this chip.
What are the most typical applications for the STM32F401CCU6?
It is widely used in USB‑to‑serial converters, portable audio dongles, wearable health monitors, compact motor controllers, IoT sensor nodes, and custom keyboards. Its small 48‑pin package, built‑in USB, and the easy‑to‑use Arduino ecosystem have made it a favorite for both hobbyist Black Pill projects and professional low‑power designs.