STM32F302CBT6 ST Mainstream Arm Cortex-M4 Mixed-Signal 32-bit MCU 128KB Flash 72MHz FPU ADC DAC Comparator LQFP-48

STM32F302CBT6 Product Overview

The STM32F302CBT6 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 128 KB Flash, 32 KB SRAM, USB 2.0 FS (crystal-less), 12-bit ADC (8ch, 0.2µs), 12-bit DAC, 2 ultra-fast comparators (25ns), 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, both Flash and SRAM are doubled, providing more storage for higher-performance mixed-signal applications. Compared to the STM32F103C8T6 (Cortex-M3), it upgrades to a Cortex-M4 core with FPU, adds ultra-fast comparators and crystal-less USB.

STM32F302CBT6 Core Features

Core: Arm Cortex-M4 72 MHz + FPU + ART Accelerator Memory: 128 KB Flash, 32 KB SRAM USB 2.0 FS: Crystal-less, LPM and BCD support 12-bit ADC: 8 channels, 0.2 µs, 0–3.6 V 12-bit DAC: 1 channel, buffered 2 Ultra-Fast Comparators: 25 ns 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)

STM32F302CBT6 Applications

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

STM32F302CBT6 Key Advantages

Cortex-M4 + FPU + Comparators: High mixed-signal integration for digital power and motor control 128 KB Flash + 32 KB SRAM: Double the storage of the F301 series for more complex applications 72 MHz FPU: Single-cycle DSP and floating-point operations Crystal-less USB: Eliminates external crystal 2 × 25ns Ultra-Fast Comparators: No external comparators needed, saves BOM ADC 0.2 µs Fast Conversion Mature STM32 Ecosystem: CubeIDE/CubeMX/HAL/LL

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FAQ:

1. What is the STM32F302CBT6 and how does it differ from the STM32F302CCT6?
   The STM32F302CBT6 is a 72 MHz Arm Cortex‑M4F microcontroller with 128 KB Flash, 32 KB SRAM, one 5 Msps 12‑bit ADC, two operational amplifiers, three comparators, a 12‑bit DAC, CAN, and USB, all in an LQFP‑48 package. It is the 128 KB Flash variant of the F302 line; the CCT6 doubles the Flash to 256 KB and expands SRAM to 48 KB. All other features—CPU, ADC, op‑amps, comparators, communication peripherals—are identical. Choose the CBT6 when your firmware fits comfortably in 128 KB and you want a cost‑optimised entry into the F302’s mixed‑signal capabilities with zero analog compromises.

2. Is 128 KB Flash and 32 KB SRAM enough for a complete motor control application with CAN and USB?
   Yes, for dedicated, well‑optimised projects. A typical FOC motor‑control library, a lightweight CANopen stack, and a USB device protocol can all be packaged within 100 KB, leaving room for application code. The 32 KB SRAM includes a zero‑wait‑state CCM block for critical real‑time variables, providing sufficient space for the control loop, communication buffers, and sensor data. If your firmware later outgrows this limit, the pin‑compatible STM32F302CCT6 (256 KB Flash) provides a direct drop‑in upgrade with no hardware changes.

3. How can the two built‑in operational amplifiers and three comparators simplify a 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 eliminating external amplifier ICs. The three fast analog comparators provide hardware cycle‑by‑cycle over‑current protection without any extra components. In the compact 48‑pin package, this 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 STM32F302CBT6 compare to the classic STM32F103CBT6 as an upgrade?
   The STM32F103CBT6 is a Cortex‑M3 with a 1 Msps ADC and no FPU. The F302CBT6 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 128 KB Flash and LQFP‑48 package, but the F302 increases SRAM to 32 KB and adds a CCM block. The pin‑out is often very similar, enabling a smooth hardware migration that dramatically improves control‑loop performance and analog precision.

5. When should I pick the STM32F302CBT6 over the STM32F303CBT6? What analog trade‑offs exist?
   The STM32F303CBT6 features four 5 Msps ADCs, four PGAs, and seven comparators, making it the top choice for applications that need simultaneous multi‑channel sampling. The STM32F302CBT6 replaces that with a single fast ADC, two op‑amps, and three comparators, still offering excellent analog performance for most single‑axis motor drives. Choose the F302CBT6 when you do not need the F303’s extreme multi‑ADC capability and want a more cost‑effective solution with the same CAN, USB, and Cortex‑M4F core.

6. Does the STM32F302CBT6 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 access 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.

7. Can the STM32F302CBT6 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 CBT6 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.

8. How fast is the single ADC on the STM32F302CBT6, 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.

9. What development tools and motor‑control libraries support the STM32F302CBT6?
   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 CBT6 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 STM32F302CBT6?
    It is ideal for entry‑level single‑axis motor drives (PMSM/BLDC), compact digital power converters, industrial sensor hubs, multi‑channel data loggers, USB‑to‑CAN bridges, and any space‑constrained design that needs a powerful Cortex‑M4F core with solid analog performance and full industrial connectivity. Its combination of 128 KB Flash, integrated op‑amps, and the popular LQFP‑48 package makes it a smart, cost‑effective choice for high‑volume professional products.