STM32F301C8T6 ST Mainstream Arm Cortex-M4 Mixed-Signal 32-bit MCU 64KB Flash 72MHz FPU ADC DAC Op-Amp LQFP-48

STM32F301C8T6 Product Overview

The STM32F301C8T6 is a Cortex-M4 mixed-signal MCU from STMicroelectronics in an LQFP-48 package. It runs at 72 MHz with FPU and ART Accelerator. It integrates 64 KB Flash, 16 KB SRAM, USB 2.0 FS (crystal-less), 12-bit ADC (11ch, 0.2µs), 12-bit DAC, 3 ultra-fast comparators (25ns), 3 programmable op-amps (PGA), up to 9 timers (incl. 2 motor control PWM/deadtime), and up to 11 communication interfaces (3×USART/1×UART/2×SPI/I2S/I2C/USB). 37 I/Os, all 5 V-tolerant. Supply 2.0–3.6 V, -40–85 °C. Compared to the STM32F103C8T6 (Cortex-M3, 72 MHz), it upgrades to a Cortex-M4 core with FPU, adds op-amps, ultra-fast comparators, and crystal-less USB, making it ideal for digital power and motor control.

STM32F301C8T6 Core Features

Core: Arm Cortex-M4 72 MHz + FPU + ART Accelerator Memory: 64 KB Flash, 16 KB SRAM USB 2.0 FS: Crystal-less, LPM and BCD support 12-bit ADC: 11 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: 2× 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), USB FS I/Os: 37, all 5 V-tolerant Low Power: Sleep/Stop/Standby, VBAT backup RTC Package: LQFP-48 (7×7 mm)

STM32F301C8T6 Applications

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

STM32F301C8T6 Key Advantages

Cortex-M4 + FPU + Op-Amps/Comparators: High mixed-signal integration for digital power and motor control 72 MHz FPU: Single-cycle DSP and floating-point operations Crystal-less USB: Eliminates external crystal 3 PGAs + 3 25ns Comparators: No external op-amps needed, saves BOM 2 Advanced Timers: Supports dual-motor FOC ADC 0.2 µs Fast Conversion Mature STM32 Ecosystem: CubeIDE/CubeMX/HAL/LL

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FAQ:

1. What is the STM32F301C8T6 and how does it differ from the STM32F301K8T6?
   The STM32F301C8T6 is a 72 MHz Arm Cortex‑M4F microcontroller with 64 KB Flash and 16 KB SRAM in an LQFP‑48 package. Compared to the smaller K8T6 (LQFP‑32), it offers the same analog and digital peripherals—one 2 Msps 12‑bit ADC, one 12‑bit DAC, one operational amplifier, and one comparator—but provides more I/Os (up to 37 vs 26). All core features are identical; the C8T6 simply gives you extra pins for connecting more sensors, actuators, or communication interfaces in a still‑compact, hand‑solderable 48‑pin body.

2. Why choose the STM32F301C8T6 over the STM32F302C8T6? What are the trade‑offs?
   The STM32F302C8T6 adds CAN and USB interfaces, a faster 5 Msps ADC, an extra op‑amp, and more comparators. The F301C8T6 strips these out to deliver the lowest possible cost for applications that do not need fieldbus or USB connectivity. You keep the Cortex‑M4F core with FPU and DSP, the 12‑bit DAC, the op‑amp, and the comparator. Choose the F301C8T6 when your design requires precision analog control and signal conditioning, but communicates only via UART, SPI, or I2C, and every cent of BOM cost matters.

3. Can 64 KB Flash and 16 KB SRAM run a real‑time control loop with sensor conditioning?
   Absolutely. A focused control algorithm (e.g., PID, simple FOC, or digital power control) and sensor‑signal processing can easily fit within 64 KB of Flash. The 16 KB SRAM provides enough room for the real‑time stack, measurement buffers, and application variables. This memory configuration is typical for cost‑sensitive, single‑purpose industrial nodes and portable instruments where firmware size is well‑characterized and optimized.

4. How can the built‑in operational amplifier and comparator simplify a compact design?
   The integrated rail‑to‑rail op‑amp can be used to amplify a shunt‑resistor voltage for current sensing, or to condition sensor signals, removing the need for an external amplifier IC. The fast analog comparator can deliver hardware cycle‑by‑cycle over‑current protection or zero‑crossing detection. Combined with the 12‑bit DAC, which can generate reference voltages or control signals, the F301C8T6 provides a complete analog front‑end with minimal external components, saving both BOM cost and PCB area in space‑constrained designs.

5. Why doesn't the STM32F301C8T6 have CAN or USB? What are my connectivity options?
   The F301 series deliberately omits CAN and USB to reduce silicon cost for applications that never use these peripherals. You still have up to 3× USART, 2× SPI, and 2× I2C interfaces, which are more than enough to interface with sensors, LCD displays, wireless modules, or another MCU. If you later find you need CAN or USB, the pin‑compatible STM32F302C8T6 (LQFP‑48) adds both while keeping the same analog front‑end and Cortex‑M4F core.

6. How does the STM32F301C8T6 compare to the classic STM32F103C8T6 as an upgrade?
   The STM32F103C8T6 uses a Cortex‑M3 core with a 1 Msps ADC and no FPU. The F301C8T6 adds a single‑precision FPU, DSP instructions, a faster 2 Msps ADC, a true 12‑bit DAC, an integrated op‑amp, and a comparator. Both offer similar Flash and a 48‑pin package, but the F301 increases SRAM to 16 KB. The pin‑out is often very similar, allowing a straightforward hardware migration that significantly boosts control‑loop performance and analog accuracy without changing the board size.

7. When should I pick the STM32F301C8T6 over the STM32F303C8T6? What analog features do I lose?
   The STM32F303C8T6 offers four 5 Msps ADCs, four PGAs, and seven comparators for high‑speed multi‑channel sampling, but it also costs more. The F301C8T6 replaces that with a single 2 Msps ADC, one op‑amp, and one comparator, plus a DAC. Choose the F301C8T6 when your application needs precise DAC output and basic analog conditioning, but does not require the extreme multi‑ADC capability of the F303. You get a more cost‑effective device while still enjoying the Cortex‑M4F core with FPU and DSP.

8. Does the STM32F301C8T6 have CCM (Core Coupled Memory)? How should I manage the SRAM?
   No, the 16 KB SRAM is a single unified block without a dedicated CCM. For real‑time performance, place your stack and time‑critical variables in the lower‑latency region of the SRAM. The entire SRAM is accessible by both the CPU and DMA without restrictions, simplifying memory management. This is perfectly adequate for most single‑loop control and sensor‑acquisition applications.

9. Can the single 2 Msps ADC handle motor control or digital power applications?
   The 12‑bit ADC samples at up to 2 Msps and supports up to 10 external channels. While slower than the 5 Msps ADCs on the F302/F303, 2 Msps is sufficient for many single‑axis motor drives (e.g., sensored BLDC, stepper motors) and moderate‑speed digital power converters. The ADC is tightly coupled to the advanced‑control timer, enabling automatic triggering with zero CPU overhead, which is essential for deterministic control loops.

10. What development tools and libraries support the STM32F301C8T6?
    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 evaluation, you can start with a NUCLEO‑F302R8 board (software‑compatible, as the F301 is a subset) and then migrate to the C8T6 by adjusting the linker script and pin‑out in CubeMX.