STM32F401CEU6 ST Mainstream Arm Cortex-M4 Dynamic Efficiency 32-bit MCU 512KB Flash 84MHz FPU USB OTG SDIO UFQFPN-48

STM32F401CEU6 Product Overview

The STM32F401CEU6 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 512 KB Flash, 96 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 STM32F401CCU6 (256 KB Flash/64 KB SRAM), Flash and SRAM are significantly upgraded, meeting the demands of large firmware and complex algorithms. Compared to the STM32F103C8T6 (Cortex-M3, 72 MHz, 64 KB Flash), this model upgrades to a Cortex-M4 core with FPU, offers higher frequency, larger memory, and adds USB OTG HS/FS and SDIO.

STM32F401CEU6 Core Features

Core: Arm Cortex-M4 84 MHz + FPU + ART Accelerator Memory: 512 KB Flash, 96 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)

STM32F401CEU6 Applications

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

STM32F401CEU6 Key Advantages

Cortex-M4 + FPU + ART Accelerator: 84 MHz high performance with DSP and floating-point support 512 KB Flash + 96 KB SRAM: Ample memory for complex applications and large protocol stacks 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:

1. What is the STM32F401CEU6 and why is it popular in compact designs?
   The STM32F401CEU6 is an 84 MHz Arm Cortex‑M4F microcontroller with 256 KB Flash and 64 KB SRAM, housed in a tiny UFQFPN‑48 package. It includes a full‑speed USB OTG controller with an integrated PHY, making it a powerful yet affordable chip for space‑constrained USB devices, wearables, and sensor nodes. Its FPU and DSP instructions deliver real‑time processing in a footprint smaller than many 8‑bit boards.

2. How does the STM32F401CEU6 differ from the STM32F401CCU6? Which one should I choose?
   Both share the same 84 MHz core, 64 KB SRAM, and UFQFPN‑48 package. The only difference is Flash size: the CEU6 offers 256 KB, while the CCU6 has 128 KB. All other features—USB OTG FS, SPI, I2C, USART—are identical. Pick the CEU6 when you need extra code space for a richer application or future updates; the CCU6 is a slightly leaner option when 128 KB is more than enough.

3. How does the STM32F401CEU6 compare with the STM32F411CEU6? When should I upgrade?
   The STM32F411CEU6 runs at 100 MHz, provides 512 KB Flash and 128 KB SRAM, and adds an extra SPI. The STM32F401CEU6 is slower and has less memory, but it consumes less power and costs less. If your firmware fits comfortably within 256 KB Flash and 64 KB SRAM, and you only need basic USB and a few serial interfaces, the F401CEU6 is the more power‑efficient and economical choice.

4. Can 256 KB Flash and 64 KB SRAM run a real‑time OS and a USB stack?
   Absolutely. A lightweight RTOS (such as FreeRTOS), a USB device stack, and a typical sensor application fit easily in 256 KB. The 64 KB SRAM is sufficient for system stacks, DMA buffers, and moderate data processing. This exact configuration is used in countless USB dongles, portable data loggers, and motor controllers.

5. Does the STM32F401CEU6 support USB high‑speed, or only full‑speed? Can it do USB audio?
   It provides a full‑speed USB OTG controller with an on‑chip PHY (12 Mbps). There is no high‑speed ULPI interface. Full‑speed is perfectly adequate for USB Audio Class 1, virtual COM ports, HID keyboards/mice, and mass‑storage devices. Many popular USB‑audio dongles are built around this chip.

6. What is the typical power consumption of the STM32F401CEU6 in low‑power modes?
   In Stop mode with the main regulator off and all 64 KB SRAM retained, the typical current is around 100 µA. The chip can wake up quickly on USB activity or external interrupts. A dedicated VBAT pin can keep the RTC running from a coin cell, making it ideal for battery‑powered sensors and portable gadgets that sleep most of the time.

7. Can I program the STM32F401CEU6 with the Arduino IDE? Is there a board package?
   Yes, the STM32F401CEU6 is fully supported by the STM32duino (Arduino Core for STM32) project. You can add the STM32 board package in the Arduino IDE, select “Generic STM32F4 series” or a specific WeAct “Black Pill” board, and upload code via USB DFU or an ST‑Link programmer. This makes it very beginner‑friendly for rapid prototyping.

8. Is there an official Nucleo board for the STM32F401CEU6? How can I prototype?
   There is no Nucleo board that exactly matches the 48‑pin UFQFPN‑48 package, but the NUCLEO‑F401RE (64‑pin) is fully software‑compatible. You can develop firmware on the Nucleo, then move to a tiny “Black Pill” or custom PCB with the CEU6. The pin‑out and peripherals are consistent; only the linker script needs to reflect the 256 KB Flash.

9. Can the STM32F401CEU6 handle motor control or DSP tasks with its FPU?
   Yes. The Cortex‑M4F core includes a single‑precision FPU and DSP instructions (single‑cycle MAC, SIMD). Advanced‑control timers with complementary PWM outputs and dead‑time insertion allow single‑axis motor drives. The 12‑bit ADC (up to 2.4 Msps) provides precise current feedback. Many sensorless FOC and digital power loops run comfortably on this chip.

10. What are the most common applications for the STM32F401CEU6?
    It is widely used in USB‑to‑serial converters, portable audio interfaces, wearable health monitors, compact motor controllers, IoT sensor nodes, and custom keyboards. Its combination of a tiny 48‑pin package, built‑in USB, and a capable M4 core with FPU makes it a favourite for both hobbyist “Black Pill” projects and professional low‑power designs.