Item specifics
Description
The STM32F302CCT6 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, 40 KB SRAM, CAN 2.0B, USB 2.0 FS (crystal-less), 12-bit ADC (15ch, 0.2µs), 12-bit DAC, 3 ultra-fast comparators (25ns), 1 programmable op-amp (PGA), up to 10 timers (incl. 2 motor control PWM/deadtime), and up to 14 communication interfaces (3×USART/3×UART/2×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 STM32F302C8T6, Flash is upgraded to 256 KB, SRAM to 40 KB, and CAN, an additional comparator, and an advanced timer are added for stronger analog and communication capabilities. 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.
Core: Arm Cortex-M4 72 MHz + FPU + ART Accelerator Memory: 256 KB Flash, 40 KB SRAM CAN 2.0B + USB 2.0 FS: Crystal-less USB, LPM and BCD support 12-bit ADC: 15 channels, 0.2 µs, 0–3.6 V 12-bit DAC: 1 channel, buffered 3 Ultra-Fast Comparators: 25 ns 1 Programmable Op-Amp (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), 2×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: High mixed-signal integration for digital power, motor control, and industrial communication 256 KB Flash + 40 KB SRAM: Large storage for complex algorithms and protocol stacks 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 3 × 25ns Ultra-Fast Comparators + 1 PGA: No external op-amps/comparators needed, saves BOM ADC 0.2 µs Fast Conversion Mature STM32 Ecosystem: CubeIDE/CubeMX/HAL/LL
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FAQ:
What is the STM32F302CCT6 and how does it differ from the STM32F303CCT6?
The STM32F302CCT6 is a 72 MHz Arm Cortex‑M4F microcontroller with 256 KB Flash and 48 KB SRAM in an LQFP‑48 package. It integrates one fast 5 Msps 12‑bit ADC, two operational amplifiers, three comparators, a 12‑bit DAC, CAN, and USB. Compared to the STM32F303CCT6, the F302 replaces the four high‑speed ADCs, four PGAs, and seven comparators with a slightly leaner analog set that still includes op‑amps and a fast ADC. This makes the F302CCT6 a more cost‑focused choice for designs that need a powerful analog front‑end and full communication interfaces, but do not require the extreme simultaneous multi‑ADC sampling of the F303.
Why would I choose the STM32F302CCT6 over the STM32F302RBT6 when both have similar analog features?
The main difference is memory and I/O count. The F302CCT6 offers double the Flash (256 KB vs 128 KB) and more SRAM (48 KB vs 32 KB) while staying in the compact 48‑pin package. If your firmware needs more space for code, assets, or a richer communication stack, the CCT6 provides that headroom without moving to a larger 64‑pin footprint. All analog and communication peripherals remain identical; you simply get more room to grow your application.
Is 256 KB Flash and 48 KB SRAM enough for a complete motor control application with CAN and USB?
Absolutely. A complete FOC library, a CANopen protocol stack, a USB device stack, and a real‑time OS can fit comfortably within 256 KB, often leaving room for custom features. The 48 KB SRAM includes a zero‑wait‑state CCM block for critical real‑time data, providing ample space for communication buffers, sensor variables, and the control loop. Many production‑proven single‑axis motor drives and industrial power converters use this exact memory configuration.
How can the two built‑in operational amplifiers and comparators reduce my BOM and PCB size?
The two embedded rail‑to‑rail op‑amps can be configured as programmable gain amplifiers or active filters, directly interfacing with shunt resistors for current measurement and eliminating external amplifier ICs. The three fast analog comparators provide cycle‑by‑cycle over‑current protection without additional components. In the compact 48‑pin package, this integration significantly reduces the number of external parts, saving both cost and board area in space‑constrained designs.
How does the STM32F302CCT6 compare to the classic STM32F103CCT6 as an upgrade?
The STM32F103CCT6 uses a Cortex‑M3 core with a 1 Msps ADC and no FPU. The F302CCT6 adds a single‑precision FPU, DSP instructions, a much faster 5 Msps ADC, a DAC, built‑in op‑amps and comparators, plus a CAN/USB combination. Both share the same 256 KB Flash and LQFP‑48 package, but the F302’s SRAM grows to 48 KB and a CCM block is added. The pin‑out is often very similar, enabling a smooth hardware migration that dramatically improves control‑loop performance and analog precision.
When should I pick the STM32F302CCT6 over the STM32F334C8T6? What analog features do I gain or lose?
The STM32F334C8T6 specializes in digital power with its HRTIM but lacks CAN and has less Flash (64 KB). The F302CCT6 provides a larger 256 KB Flash, a CAN 2.0B interface, and a USB device controller, while still offering a fast ADC, op‑amps, and comparators. Choose the F302CCT6 for general‑purpose motor control and industrial communication; pick the F334C8T6 if your design depends on extremely high‑resolution PWM generation (e.g., lighting, LLC converters) and CAN/USB is not required.
Does the STM32F302CCT6 have CCM (Core Coupled Memory), and how should I use it?
Yes, the 48 KB SRAM includes an 8 KB CCM block that provides zero‑wait‑state access for the CPU. Place your real‑time control stack, critical loop variables, and lookup tables there for deterministic, low‑latency access. Because DMA cannot access the CCM, all ADC, CAN, USB, and other DMA‑driven buffers must reside in the remaining 40 KB system SRAM. Proper CCM usage significantly reduces control‑loop jitter.
Can the STM32F302CCT6 run USB and CAN at the same time? What other interfaces are available?
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. You also have up to three USARTs, two SPIs, and two I2Cs. This makes the CCT6 a versatile single‑motor‑drive node that can communicate over CAN in an industrial network and over USB for configuration or firmware updates—all from a single 48‑pin chip.
How fast is the single ADC on the STM32F302CCT6, and is it sufficient for motor control?
The 12‑bit ADC can sample at up to 5 Msps and supports up to 10 external channels. While it is a single ADC, it can sequentially sample two or three motor phases with very low delay. It is tightly coupled to the advanced timers, enabling automatic triggering at the PWM center or edge with zero CPU overhead. For single‑axis FOC or digital power loops, this speed is more than adequate and delivers excellent current measurement accuracy.
What development tools and motor‑control libraries support the STM32F302CCT6?
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 that work seamlessly with the F302’s ADC, op‑amps, and timers. You can evaluate on a NUCLEO‑F302R8 or NUCLEO‑F303RE board (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.