STM32F301K8U6 ST Mainstream Arm Cortex-M4 Mixed-Signal 32-bit MCU 64KB Flash 72MHz FPU ADC DAC Op-Amp UFQFPN-32

STM32F301K8U6 Product Overview

The STM32F301K8U6 is a Cortex-M4 mixed-signal MCU from STMicroelectronics in an ultra-compact UFQFPN-32 package (5×5 mm). It runs at 72 MHz with FPU and ART Accelerator. It integrates 64 KB Flash, 16 KB SRAM, 12-bit ADC (8ch, 0.2µs), 12-bit DAC, 3 ultra-fast comparators (25ns), 3 programmable op-amps (PGA), up to 9 timers (incl. 1 motor control PWM/deadtime), and up to 11 communication interfaces (3×USART/1×UART/2×SPI/I2S/I2C). 26 I/Os, all 5 V-tolerant. Supply 2.0–3.6 V, -40–85 °C. Core specs are identical to the STM32F301K8T6 (LQFP-32, 7×7 mm); only the package is upgraded from LQFP-32 to UFQFPN-32 (5×5×0.55 mm), making it ideal for compact designs with strict PCB size and height constraints. Compared to the STM32F103C8T6 (Cortex-M3), it upgrades to a Cortex-M4 core with FPU, adds op-amps and ultra-fast comparators for digital power and motor control.

STM32F301K8U6 Core Features

Core: Arm Cortex-M4 72 MHz + FPU + ART Accelerator Memory: 64 KB Flash, 16 KB SRAM 12-bit ADC: 8 channels, 0.2 µs, 0–3.6 V 12-bit DAC: 1 channel, buffered 3 Ultra-Fast Comparators: 25 ns 3 Programmable Op-Amps (PGA): Gain ×2/×4/×8/×16 Timers: 1× motor control PWM (deadtime/emergency stop), 3× 16-bit GP, 1× 32-bit GP, 2× watchdogs, SysTick Communication Interfaces: 3×USART + 1×UART (ISO7816/LIN/IrDA), 2×SPI/I2S, I2C (SMBus) I/Os: 26, all 5 V-tolerant Low Power: Sleep/Stop/Standby, VBAT backup RTC Package: UFQFPN-32 (5×5×0.55 mm)

STM32F301K8U6 Applications

Digital Power: SMPS, inverters, PFC Motor Control: BLDC/PMSM FOC, fans, pumps Consumer: Game controllers, remote controls IoT Nodes Sensor Signal Conditioning

STM32F301K8U6 Key Advantages

Cortex-M4 + FPU + Op-Amps/Comparators: High mixed-signal integration for digital power and motor control UFQFPN-32 Ultra-Compact Package: 5×5 mm, 26 I/Os, ideal for space-constrained designs 72 MHz FPU: Single-cycle DSP and floating-point operations 3 PGAs + 3 25ns Comparators: No external op-amps needed, saves BOM ADC 0.2 µs Fast Conversion Mature STM32 Ecosystem: CubeIDE/CubeMX/HAL/LL

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FAQ:

1. What is the STM32F301K8U6 and how does it differ from the STM32F302K8U6?
   The STM32F301K8U6 is a 72 MHz Arm Cortex‑M4F microcontroller with 64 KB Flash and 16 KB SRAM in a tiny UFQFPN‑32 package. It includes one 2 Msps 12‑bit ADC, one 12‑bit DAC, one operational amplifier, and one comparator. Compared to the STM32F302K8U6, the F301 removes the CAN and USB interfaces, and its ADC is slightly slower (2 Msps vs 5 Msps). However, it keeps the same FPU/DSP core and the integrated op‑amp and comparator. This makes the F301K8U6 the most cost‑optimized entry point into the STM32F3 mixed‑signal family for simple sensor‑acquisition and analog‑control tasks that do not require fieldbus or USB connectivity.

2. Can 64 KB Flash and 16 KB SRAM run a real‑time control loop with sensor conditioning?
   Absolutely. A dedicated control algorithm (such as a PID loop or simple FOC core) and sensor‑signal processing can easily fit within 64 KB of Flash. The 16 KB SRAM is sufficient for the real‑time stack, measurement buffers, and application variables. This memory configuration is typical for single‑purpose industrial nodes, portable instruments, and cost‑sensitive products where every byte of Flash is optimized.

3. How can the built‑in operational amplifier and comparator help in a compact design?
   The integrated rail‑to‑rail op‑amp can be used for signal conditioning, such as amplifying a shunt‑resistor voltage for current measurement, without an external amplifier IC. The fast analog comparator can provide cycle‑by‑cycle over‑current protection or zero‑crossing detection. In the tiny UFQFPN‑32 footprint, this integration saves at least one external op‑amp and comparator, reducing BOM cost and PCB area significantly.

4. Why does the STM32F301K8U6 lack CAN and USB? What are my communication options?
   The F301 series intentionally omits CAN and USB to offer the lowest possible cost for applications that do not require fieldbus or USB connectivity. You still have up to 2× USART, 2× SPI, and 2× I2C interfaces, which are sufficient for local communication with sensors, displays, or wireless modules. If your design absolutely needs CAN or USB, the pin‑compatible STM32F302K8U6 adds both while keeping the same analog front‑end.

5. How does the STM32F301K8U6 compare to the classic STM32F103C8T6 as an upgrade?
   The STM32F103C8T6 is a Cortex‑M3 with a 1 Msps ADC and no FPU. The F301K8U6 adds a single‑precision FPU, DSP instructions, a faster 2 Msps ADC, a DAC, an integrated op‑amp, and a comparator. Both share a similar 32‑pin footprint and 64 KB Flash, but the F301 increases SRAM to 16 KB. The pin‑out can often be made compatible with minor adjustments, giving a smooth upgrade that significantly improves control‑loop performance and analog capability without increasing board size.

6. When should I pick the STM32F301K8U6 over the STM32F302K8U6? What do I sacrifice?
   Choose the F301K8U6 when your application does not need CAN or USB, and a 2 Msps ADC is fast enough for your control or measurement requirements. You sacrifice the faster 5 Msps ADC, CAN, USB, and an additional op‑amp and comparator, but in return you get the lowest‑cost Cortex‑M4F with an integrated op‑amp and DAC on the market. It is perfect for high‑volume, cost‑sensitive products where every cent matters and the control algorithm is well‑defined.

7. Does the STM32F301K8U6 have CCM (Core Coupled Memory)? How should I manage the SRAM?
   No, the STM32F301K8U6 does not include CCM; its 16 KB SRAM is a single unified block. For real‑time performance, you can place your stack and critical variables in the lower‑latency part of the SRAM (generally the first few kilobytes are accessed with fewer wait states), but the entire SRAM is equally accessible by the CPU and DMA. This simplicity makes memory management straightforward and is perfectly adequate for most single‑loop control applications.

8. How fast is the single ADC on the STM32F301K8U6, and is it suitable for motor control?
   The 12‑bit ADC can sample at up to 2 Msps and supports up to 10 external channels. While it is not as fast as the 5 Msps ADCs on the F302/F303, 2 Msps is still sufficient for many single‑axis motor drives (e.g., sensored BLDC, stepper motors) and digital power converters at moderate switching frequencies. The ADC is coupled to the advanced‑control timer, enabling automatic triggering with no CPU overhead.

9. What development tools and libraries support the STM32F301K8U6?
   All major IDEs—free STM32CubeIDE, Keil MDK, and IAR EWARM—fully support the chip. The STM32CubeF3 firmware package provides HAL/LL drivers and examples for the ADC, DAC, op‑amp, and comparator. For motor‑control evaluation, you can start with a NUCLEO‑F302R8 board (software‑compatible, as the F301 is a subset) and then migrate to the K8U6 by adjusting the linker script and pin‑out in CubeMX.

10. What are the most typical applications for the STM32F301K8U6?
    It is ideal for ultra‑compact, cost‑sensitive embedded controllers: portable medical devices, simple motor drives (e.g., fan controllers), power tools, low‑end digital power supplies, sensor nodes with local analog processing, and any design that needs a Cortex‑M4F with FPU, a DAC, an op‑amp, and a comparator in the smallest possible 32‑pin footprint, without the expense of CAN or USB.