Item specifics
Description
The STM32F302K8U6 is a Cortex-M4 mixed-signal MCU from STMicroelectronics in an ultra-compact UFQFPN-32 package (5×5×0.55 mm). It runs at 72 MHz with FPU and ART Accelerator. It integrates 64 KB Flash, 16 KB SRAM, 12-bit ADC (8ch, 0.2µs), 12-bit DAC (2ch), 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). 26 I/Os, all 5 V-tolerant. Supply 2.0–3.6 V, -40–85 °C. Core specs are identical to the STM32F302C8T6 (LQFP-48, 37 I/Os, USB), but in a UFQFPN-32 package with 26 I/Os and no USB, making it ideal for space-constrained mixed-signal applications that don't require USB. Compared to the STM32F301K8U6, DAC channels are increased to 2 while comparators are reduced by 1, optimizing the analog configuration for dual DAC output.
Core: Arm Cortex-M4 72 MHz + FPU + ART Accelerator Memory: 64 KB Flash, 16 KB SRAM 12-bit ADC: 8 channels, 0.2 µs, 0–3.6 V 12-bit DAC: 2 channels, 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) I/Os: 26, all 5 V-tolerant Low Power: Sleep/Stop/Standby, VBAT backup RTC Package: UFQFPN-32 (5×5×0.55 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 + Comparators: High mixed-signal integration for digital power and motor control UFQFPN-32 Ultra-Compact Package: 5×5 mm, 26 I/Os, ideal for space-constrained designs 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 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:
What is the STM32F302K8U6 and how does it differ from the STM32F303K8T6?
The STM32F302K8U6 is a 72 MHz Arm Cortex‑M4F microcontroller with 64 KB Flash, 16 KB SRAM, and a compact mixed‑signal front‑end, all in a tiny UFQFPN‑32 package. Compared to the STM32F303K8T6, the F302K8U6 replaces the four 5 Msps ADCs, four PGAs, and seven comparators with a single 5 Msps ADC, two general‑purpose op‑amps, and three comparators. CAN, USB, and the FPU/DSP core are identical. This makes the F302K8U6 a more cost‑focused option for space‑constrained designs that need solid analog performance and industrial communication, but do not require the extreme simultaneous sampling capability of the F303.
Can 64 KB Flash and 16 KB SRAM run a real‑time motor control application with CAN and USB?
Yes, for well‑optimized, focused applications. A lightweight FOC library, a CANopen stack, and a USB device protocol can all fit within 64 KB. The 16 KB SRAM includes a small block of Core Coupled Memory (CCM) for zero‑wait‑state access to critical variables, providing enough room for the real‑time stack, communication buffers, and sensor data. If your firmware later outgrows this limit, you can migrate to the pin‑compatible STM32F303K8T6 (still 64 KB) or consider a larger package variant with more Flash.
How can the built‑in operational amplifiers and comparators simplify a compact motor drive?
The two embedded rail‑to‑rail op‑amps can be used for signal conditioning or current sensing directly from shunt resistors, removing the need for external amplifier ICs. The three fast analog comparators provide hardware cycle‑by‑cycle over‑current protection. In the tiny UFQFPN‑32 footprint, this integration dramatically reduces component count and PCB area, making a complete single‑motor drive or power converter feasible on a very small board.
How does the STM32F302K8U6 compare to the classic STM32F103C8T6 as an upgrade?
The STM32F103C8T6 is a Cortex‑M3 with a 1 Msps ADC and no FPU. The F302K8U6 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 32‑pin footprint and 64 KB Flash, but the F302 increases SRAM to 16 KB with CCM. The pin‑out can often be adapted with minor changes, giving a substantial boost in control‑loop performance and analog capability.
When should I pick the STM32F302K8U6 over the STM32F334K8T6? What is the trade‑off?
The STM32F334K8T6 targets digital power with its High‑Resolution Timer (HRTIM) but lacks CAN and USB. The F302K8U6 provides a CAN 2.0B interface and a USB device controller while still delivering a fast ADC, op‑amps, and comparators. Choose the F302K8U6 when you need industrial fieldbus communication and a versatile analog front‑end in a tiny package. Pick the F334K8T6 for high‑resolution PWM in lighting or power conversion if CAN/USB is not required.
Does the STM32F302K8U6 have CCM (Core Coupled Memory), and how should I use it?
Yes, the 16 KB SRAM includes a CCM block that offers zero‑wait‑state CPU access. 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 reside in the remaining system SRAM. Proper CCM usage significantly reduces control‑loop jitter.
Can the STM32F302K8U6 use USB and CAN at the same time with only 32 pins?
Yes, with careful pin planning. The CAN TX/RX and USB D+/D‑ pins can be assigned to non‑conflicting locations. However, this consumes a large portion of the available 26 I/O pins, so you may need to limit the number of external analog channels and other peripherals. STM32CubeMX is essential for verifying that your exact pin‑out fits within the UFQFPN‑32 constraint.
How fast is the single ADC on the STM32F302K8U6, and is it sufficient for motor control?
The 12‑bit ADC reaches up to 5 Msps and supports up to 10 external channels. Although it is a single ADC, it can still sample two or three phases sequentially with very low delay, and it is tightly coupled to the advanced timers for automatic triggering at the PWM center or edge. For most single‑axis motor drives and digital power converters, this speed is more than enough to run accurate FOC or peak‑current control.
What development tools and motor‑control libraries support the STM32F302K8U6?
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 and timers. You can evaluate on a NUCLEO‑F302R8 or NUCLEO‑F303RE board (software‑compatible), then migrate to the K8U6 by adjusting the linker script and pin‑out in CubeMX.
What are the most typical applications for the STM32F302K8U6?
It is ideal for ultra‑compact single‑axis motor drives, miniature digital power converters, portable sensor hubs, USB‑to‑CAN bridges, and any space‑constrained design that requires a powerful Cortex‑M4F core with solid analog performance and industrial connectivity. Its tiny UFQFPN‑32 package and cost‑optimized feature set make it a popular choice for high‑volume, cost‑sensitive embedded products.