STM32F303C8T6 ST Mainstream Arm Cortex-M4 Mixed-Signal 32-bit MCU 64KB Flash 72MHz FPU CAN ADC DAC Op-Amp LQFP-48

STM32F303C8T6 Product Overview

The STM32F303C8T6 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, 12 KB SRAM, CAN 2.0B, USB 2.0 FS (crystal-less), 4×12-bit ADCs (14ch, 0.2µs), 12-bit DAC (2ch), 7 ultra-fast comparators (25ns), 4 programmable op-amps (PGA), up to 9 timers (incl. 1 motor control PWM/deadtime), and up to 14 communication interfaces (3×USART/3×UART/3×SPI/I2S/I2C/USB/CAN). 37 I/Os, all 5 V-tolerant. Supply 2.0–3.6 V, -40–85 °C. Compared to the STM32F302C8T6, the number of ADCs is upgraded to 4 (vs. 1 on F302), op-amps to 4, and comparators to 7, significantly enhancing analog peripherals. Compared to the STM32F103C8T6 (Cortex-M3), it upgrades to a Cortex-M4 core with FPU, adds op-amps, ultra-fast comparators, CAN, and crystal-less USB.

STM32F303C8T6 Core Features

Core: Arm Cortex-M4 72 MHz + FPU + ART Accelerator Memory: 64 KB Flash, 12 KB SRAM CAN 2.0B + USB 2.0 FS: Crystal-less USB, LPM and BCD support 4×12-bit ADCs: 14 channels, 0.2 µs, 0–3.6 V 12-bit DAC: 2 channels, buffered 7 Ultra-Fast Comparators: 25 ns 4 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 + 3×UART (ISO7816/LIN/IrDA), 3×SPI/I2S, I2C (SMBus), USB FS, CAN 2.0B I/Os: 37, all 5 V-tolerant Low Power: Sleep/Stop/Standby, VBAT backup RTC Package: LQFP-48 (7×7 mm)

STM32F303C8T6 Applications

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

STM32F303C8T6 Key Advantages

Cortex-M4 + FPU + Op-Amps/Comparators + CAN: Extremely high mixed-signal integration for digital power, motor control, and industrial communication 4 ADCs + 4 PGAs + 7 Comparators: Rich analog peripherals, no external op-amps/comparators needed, saves significant BOM 72 MHz FPU: Single-cycle DSP and floating-point operations Crystal-less USB + CAN 2.0B: Combines industrial bus and general communication ADC 0.2 µs Fast Conversion Mature STM32 Ecosystem: CubeIDE/CubeMX/HAL/LL

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FAQ:

1. What is the STM32F303C8T6 and how does it differ from the STM32F303CCT6?
   The STM32F303C8T6 is a 72 MHz Arm Cortex‑M4F microcontroller with 64 KB Flash and 16 KB SRAM (including a 4 KB CCM block) in an LQFP‑48 package. It retains the full high‑speed analog front‑end of the larger CCT6: four 5 Msps 12‑bit ADCs, two DACs, seven comparators, and four programmable gain amplifiers, plus CAN and USB. The only difference is memory—the CCT6 doubles Flash to 256 KB and expands SRAM to 48 KB. Choose the C8T6 when your code fits within 64 KB and you want the most cost‑effective access to the F303’s powerful analog and motor‑control features, with zero analog compromises.

2. Is 64 KB of Flash really enough for a complete motor control application with CAN and USB?
   Absolutely, for well‑optimized and focused applications. A compact FOC library, a lightweight CANopen stack, and a USB device protocol can all be packaged within 64 KB, especially when using code‑size optimizations. The 16 KB SRAM—with 4 KB of zero‑wait‑state CCM for critical real‑time data—provides enough space for the control loop, communication buffers, and sensor variables. If your firmware later grows beyond this limit, the pin‑compatible STM32F303CCT6 (256 KB) provides a direct drop‑in upgrade with no hardware changes.

3. How do the built‑in PGAs and comparators simplify a compact motor‑drive PCB?
   The four embedded programmable gain amplifiers connect directly to shunt resistors for phase‑current measurement, eliminating external op‑amps and their associated passive components. The seven fast analog comparators provide cycle‑by‑cycle over‑current protection without any extra ICs. In the compact 48‑pin package, this high level of integration drastically reduces BOM count and PCB area, making a single‑chip motor drive or digital power converter completely feasible on a small board.

4. How does the STM32F303C8T6 compare to the classic STM32F103C8T6 as an upgrade?
   The STM32F103C8T6 is a Cortex‑M3 MCU with a 1 Msps 12‑bit ADC and no FPU. The F303C8T6 adds a single‑precision FPU, DSP instructions, four 5 Msps ADCs, dual DACs, built‑in PGAs, high‑speed comparators, and a CAN/USB combination—all while keeping the same 48‑pin footprint and 64 KB Flash. SRAM is increased to 16 KB and a CCM block is added. The pin‑out is often very similar, enabling a straightforward hardware migration that dramatically improves control‑loop performance and analog accuracy.

5. When should I pick the STM32F303C8T6 over the STM32F303K8T6? Is the extra I/O worth it?
   Both share the same 64 KB Flash and 16 KB SRAM, but the C8T6 comes in a 48‑pin package with up to 37 I/Os, while the K8T6 offers only 26 I/Os in a 32‑pin package. This extra I/O allows you to route more HRTIM channels, ADC inputs, and communication interfaces without pin conflicts. Choose the C8T6 when you need the full F303 analog front‑end and still want to connect several sensors and actuators. If board space is extremely limited and you can live with fewer I/Os, the K8T6 is even smaller.

6. Does the STM32F303C8T6 have CCM (Core Coupled Memory), and how should I use it?
   Yes, it includes 4 KB of CCM that provides zero‑wait‑state access for the CPU. Use it for the real‑time stack, critical control‑loop variables, and lookup tables that require deterministic latency. Because DMA cannot access the CCM, all ADC, communication, and DMA buffers must be placed in the remaining 12 KB system SRAM. Proper CCM usage can measurably reduce control‑loop jitter.

7. Can the STM32F303C8T6 run USB and CAN at the same time? How many communication interfaces are there?
   Yes. It includes a full‑speed USB device controller (external pull‑up required; no on‑chip PHY) and a CAN 2.0B interface that can operate concurrently. Additionally, you have up to three USARTs, two SPIs, and two I2Cs. This makes the C8T6 a versatile single‑motor‑drive node that communicates over CAN on an industrial network and over USB for configuration or firmware updates—all from a single 48‑pin chip.

8. How fast are the four ADCs on the STM32F303C8T6, and can they sample simultaneously?
   The four 12‑bit ADCs each achieve up to 5 Msps; in dual‑interleaved mode, two ADCs reach 10 Msps. They support true simultaneous sampling across multiple channels, which is essential for accurate three‑phase current and voltage measurement in motor drives. The ADCs are tightly coupled to the advanced timers, enabling automatic triggering at the PWM center or edge with zero CPU overhead—even in the compact 48‑pin package.

9. What development tools and motor‑control libraries support the STM32F303C8T6?
   All major IDEs—free STM32CubeIDE, Keil MDK, and IAR EWARM—fully support the chip. ST provides the X‑CUBE‑MCSDK with ready‑to‑use FOC and six‑step algorithms optimized for the F303’s fast ADCs and PGAs. For evaluation, you can start with a NUCLEO‑F303RE board (64‑pin, software‑compatible) and then migrate to the C8T6 by adjusting the linker script and pin‑out in CubeMX. The STM32CubeF3 firmware package includes comprehensive examples.

10. What are the most typical applications for the STM32F303C8T6?
    It is ideal for cost‑sensitive single‑axis motor drives (PMSM/BLDC), compact digital power converters, industrial sensor hubs, multi‑channel data loggers, and any space‑constrained design that needs a high‑performance mixed‑signal MCU with CAN and USB connectivity. Its unique combination of a full F303 analog chain and a compact 48‑pin package makes it a popular entry point for professional motor‑control and power‑conversion products.