Item specifics
Description
The STM32F303CCT6 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 256 KB Flash, 48 KB SRAM, CAN 2.0B, USB 2.0 FS (crystal-less), 4×12-bit ADCs (15ch, 0.2µs), 12-bit DAC (2ch), 7 ultra-fast comparators (25ns), 4 programmable op-amps (PGA), up to 11 timers (incl. 2 motor control PWM/deadtime), and up to 15 communication interfaces (3×USART/3×UART/3×SPI/I2S/2×I2C/USB/CAN). 37 I/Os, all 5 V-tolerant. Supply 2.0–3.6 V, -40–85 °C. Compared to the STM32F303CBT6 (128 KB Flash/32 KB SRAM), both Flash and SRAM are upgraded to support larger firmware and more complex control algorithms. Compared to the STM32F302CCT6 (256 KB Flash/40 KB SRAM), analog peripherals are significantly enhanced: ADCs increase from 1 to 4, comparators from 3 to 7, and op-amps from 1 to 4, making it ideal for digital power and motor control applications requiring high-precision multi-channel analog front-ends.
Core: Arm Cortex-M4 72 MHz + FPU + ART Accelerator Memory: 256 KB Flash, 48 KB SRAM CAN 2.0B + USB 2.0 FS: Crystal-less USB, LPM and BCD support 4×12-bit ADCs: 15 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: 2× 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, 2×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)
Digital Power: SMPS, inverters, PFC Motor Control: Dual-motor FOC (2 advanced timers), BLDC/PMSM, fans, pumps Industrial Automation: CAN bus nodes, inverters Consumer: Game controllers, remote controls IoT Nodes Sensor Signal Conditioning
Cortex-M4 + FPU + Op-Amps/Comparators + CAN: Extremely high mixed-signal integration for digital power, motor control, and industrial communication 256 KB Flash + 48 KB SRAM: Large storage for complex algorithms and multi-protocol stacks 4 ADCs + 4 PGAs + 7 Comparators: Rich analog peripherals, no external op-amps/comparators needed, saves significant BOM Dual Advanced Timers: Supports dual-motor FOC 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:
What is the STM32F303CCT6 and how does it fit between the K8T6 and RCT6?
The STM32F303CCT6 is a 72 MHz Arm Cortex‑M4F microcontroller with 256 KB Flash and 48 KB SRAM (40 KB system + 8 KB CCM) in an LQFP‑48 package. It offers the perfect middle ground: more I/Os (up to 37) than the 32‑pin K8T6, but a much smaller footprint than the 64‑pin RCT6. Crucially, it keeps the exact same high‑speed analog front‑end—four 5 Msps ADCs, two DACs, seven comparators, and four PGAs—alongside CAN and USB. Choose the CCT6 when you need the full F303 analog power and connectivity in a compact design that cannot accommodate the larger LQFP‑64 package but requires more I/Os than the tiny 32‑pin version.
Is 256 KB Flash and 48 KB SRAM enough for a real‑time motor control application with CAN and USB?
Yes, it is a very capable configuration. A complete FOC library, a CANopen protocol stack, a USB device stack, and a real‑time OS can comfortably fit within 256 KB, often leaving room for custom features. The 48 KB SRAM (including 8 KB of zero‑wait‑state CCM for critical control variables) provides ample space for communication buffers, sensor data, and the real‑time control loop. Many production‑proven single‑axis motor drives and industrial power converters ship with this exact memory layout.
How can the integrated PGAs and comparators reduce my BOM and PCB size?
The four embedded programmable gain amplifiers directly interface with 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 the need for external ICs. This integration is especially valuable in the 48‑pin package, where every pin and square millimeter of board space counts.
How does the STM32F303CCT6 compare to the STM32F103CCT6 as an upgrade?
The STM32F103CCT6 is a Cortex‑M3 MCU with a 1 Msps 12‑bit ADC and no FPU. The F303CCT6 upgrades this with a single‑precision FPU, DSP instructions, four 5 Msps ADCs, dual DACs, built‑in PGAs, high‑speed comparators, and a CAN/USB combination. Both share the same 256 KB Flash and LQFP‑48 package, but the F303’s SRAM grows to 48 KB and a CCM block is added. The pin‑out is often very similar, allowing a straightforward hardware migration that dramatically boosts control‑loop performance and analog precision.
When should I pick the STM32F303CCT6 over the STM32F334C8T6? What are the key differences?
Both are 48‑pin, Cortex‑M4F MCUs with a rich analog front‑end, but they serve different purposes. The STM32F334C8T6 specializes in digital power with its HRTIM (High‑Resolution Timer) but lacks CAN and has less Flash (64 KB). The F303CCT6 provides a larger 256 KB Flash, a CAN 2.0B interface, and a USB device controller, while still delivering excellent analog performance. Choose the F303CCT6 for general‑purpose motor control and industrial communication; pick the F334C8T6 if your application depends on extremely precise PWM generation for power conversion or lighting and does not require CAN or USB.
Does the STM32F303CCT6 have CCM (Core Coupled Memory), and how should I use it?
Yes, it includes 8 KB of CCM that provides zero‑wait‑state access for the CPU. Use it for the real‑time stack, critical control‑loop variables, and frequently accessed lookup tables that require deterministic latency. Remember that DMA cannot access the CCM, so place all ADC, communication, and DMA buffers in the remaining 40 KB system SRAM. Proper use of the CCM can measurably reduce control‑loop jitter.
Can the STM32F303CCT6 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, both of which can operate concurrently. Additionally, you have three USARTs, two SPIs, and two I2Cs. This makes the CCT6 a versatile single‑motor‑drive node that can communicate over CAN on an industrial network and over USB for configuration or firmware updates—all from a single 48‑pin chip.
How fast are the ADCs on the STM32F303CCT6, and can they sample multiple channels simultaneously?
The four 12‑bit ADCs can each achieve up to 5 Msps; in dual‑interleaved mode, two ADCs reach 10 Msps. They support true simultaneous sampling across channels, which is essential for accurate three‑phase current and voltage measurement in motor drives. The ADCs are tightly coupled to the advanced timers, allowing automatic triggering at the PWM center or edge with zero CPU overhead—even in the compact 48‑pin package.
What development tools and motor‑control libraries support the STM32F303CCT6?
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 CCT6 by adjusting the linker script and pin‑out in CubeMX. The STM32CubeF3 firmware package includes comprehensive examples.
What are the most typical applications for the STM32F303CCT6?
It is ideal for compact single‑axis motor drives (PMSM/BLDC), digital power converters, industrial sensor hubs, multi‑channel data loggers, and any space‑constrained design that requires a high‑performance mixed‑signal MCU with CAN and USB connectivity. Its 48‑pin package hits the sweet spot between I/O count and board area, making it a popular, well‑balanced choice in the STM32F3 family.