Item specifics
Description
The STM32F302C8T6 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 (2ch), 2 ultra-fast comparators (25ns), 2 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/USB). 37 I/Os, all 5 V-tolerant. Supply 2.0–3.6 V, -40–85 °C. Compared to the STM32F301C8T6, this model adds an additional DAC channel (2 total), with one fewer PGA and comparator, optimizing the analog configuration for dual DAC output. Compared to the STM32F103C8T6 (Cortex-M3), it upgrades to a Cortex-M4 core with FPU, adds op-amps, ultra-fast comparators, and crystal-less USB.
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: 2 channels, buffered 2 Ultra-Fast Comparators: 25 ns 2 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), USB FS 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: BLDC/PMSM FOC, fans, pumps Consumer: Game controllers, remote controls IoT Nodes Sensor Signal Conditioning
Cortex-M4 + FPU + Op-Amps/Comparators: High mixed-signal integration for digital power and motor control Dual 12-bit DAC Output: Adds 1 DAC channel over the F301 series, suitable for dual analog output or synchronous excitation 72 MHz FPU: Single-cycle DSP and floating-point operations Crystal-less USB: Eliminates external crystal 2 PGAs + 2 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:
What is the STM32F302C8T6 and how does it differ from the STM32F302CCT6?
The STM32F302C8T6 is a 72 MHz Arm Cortex‑M4F microcontroller with 64 KB Flash and 32 KB SRAM, housed 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 F302CCT6, the Flash is reduced from 256 KB to 64 KB, and SRAM from 48 KB to 32 KB, but the analog front‑end and communication peripherals remain identical. The C8T6 stands out for offering 32 KB of SRAM (including 8 KB CCM) at a small Flash capacity, giving developers generous real‑time memory while keeping code storage lean. Choose the C8T6 when your firmware is compact but your control loops and communication buffers need more RAM.
Why does the STM32F302C8T6 have 32 KB SRAM when the Flash is only 64 KB? How does that compare to the STM32F303C8T6?
This combination is deliberate and unique: the F302C8T6 provides double the SRAM of the similarly‑flash‑sized STM32F303C8T6 (32 KB vs 16 KB). It is designed for applications that need generous data buffers for sensor fusion, communication stacks, or real‑time control loops, but whose firmware footprint is compact. The extra SRAM, including a zero‑wait‑state CCM block, allows you to implement feature‑rich CAN/USB communication and advanced motor control algorithms without moving to a larger Flash variant. The F303C8T6, by contrast, invests its silicon in four fast ADCs and PGAs, sacrificing SRAM. Choose the F302C8T6 when RAM is more critical than parallel multi‑ADC sampling.
Is 64 KB Flash and 32 KB SRAM enough for a complete motor control application with CAN and USB?
Yes, for focused and well‑optimised projects. A typical FOC library and a lightweight CANopen/USB stack can be tightly packed into 64 KB, especially when compiler optimizations are enabled. The 32 KB SRAM—including 8 KB of CCM for zero‑wait‑state access to critical variables—gives you enough headroom for communication buffers, sensor data, and the real‑time control stack. If your firmware later outgrows the Flash limit, the pin‑compatible STM32F302CCT6 (256 KB Flash) provides a direct upgrade without hardware changes.
How can the two built‑in operational amplifiers and three comparators simplify my compact motor‑drive design?
The two embedded rail‑to‑rail op‑amps can be configured as programmable gain amplifiers or active filters, directly interfacing with shunt resistors for phase‑current measurement and removing the need for external amplifier ICs. The three fast analog comparators provide hardware cycle‑by‑cycle over‑current protection without extra components. In the compact 48‑pin package, this integration dramatically reduces BOM count and PCB area, enabling a complete single‑motor drive or digital power converter on a very small board.
How does the STM32F302C8T6 compare to the classic STM32F103C8T6 as an upgrade?
The STM32F103C8T6 is a Cortex‑M3 MCU with a 1 Msps ADC and no FPU. The F302C8T6 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 a similar 48‑pin footprint and 64 KB Flash, but the F302 increases SRAM to 32 KB and adds an 8 KB CCM block. The pin‑out is often very similar, allowing a smooth hardware migration that dramatically boosts control‑loop performance and analog precision without increasing board size.
When should I pick the STM32F302C8T6 over the STM32F303C8T6? What are the trade‑offs?
Both are 64 KB Flash, 48‑pin MCUs with Cortex‑M4F cores, but their analog resources differ. The F303C8T6 features four 5 Msps ADCs, four PGAs, and seven comparators for simultaneous multi‑phase sampling, but it only has 16 KB of SRAM. The F302C8T6 offers a single fast ADC, two op‑amps, and three comparators, but doubles the SRAM to 32 KB. Choose the F302C8T6 when you need more RAM for communication stacks, data logging, or complex control loops, and you can manage with a single ADC. Pick the F303C8T6 if you need four ADCs and PGAs for true simultaneous multi‑channel sampling, and can work within 16 KB of SRAM.
Does the STM32F302C8T6 have CCM (Core Coupled Memory), and how should I use it?
Yes, the 32 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 reach the CCM, all ADC, CAN, USB, and DMA‑driven buffers must be placed in the remaining 24 KB of system SRAM. Proper CCM usage can significantly reduce control‑loop jitter.
Can the STM32F302C8T6 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 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 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 is the single ADC on the STM32F302C8T6, and is it adequate for field‑oriented control?
The 12‑bit ADC can sample at up to 5 Msps and supports up to 10 external channels. Although it is a single ADC, it can sequentially sample two or three motor phases with very low latency. 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 sufficient and delivers accurate current and voltage measurements.
What development tools and motor‑control libraries support the STM32F302C8T6?
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. For evaluation, you can start with a NUCLEO‑F302R8 or NUCLEO‑F303RE board (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.