Item specifics
Description
The STM32F303K8T6 is a Cortex-M4 mixed-signal MCU from STMicroelectronics in an LQFP-32 package. It runs at 72 MHz with FPU and ART Accelerator. It integrates 64 KB Flash, 12 KB SRAM, 4×12-bit ADCs (up to 10 channels, 0.2µs), 12-bit DAC (2ch), 7 ultra-fast comparators (25ns), 4 programmable op-amps (PGA), up to 9 timers (incl. 1 motor control PWM/deadtime), and up to 11 communication interfaces (3×USART/1×UART/3×SPI/I2S/I2C). 25 I/Os, all 5 V-tolerant. Supply 2.0–3.6 V, -40–85 °C. This model has no USB and no CAN. Core specs are identical to the STM32F303C8T6 (LQFP-48, 37 I/Os, USB, CAN), but in a smaller package without USB and CAN, ideal for space-constrained, analog-only applications. Compared to the STM32F103C8T6 (Cortex-M3), it upgrades to a Cortex-M4 core with FPU and significantly enhanced analog peripherals.
Core: Arm Cortex-M4 72 MHz + FPU + ART Accelerator Memory: 64 KB Flash, 12 KB SRAM 4×12-bit ADCs: Up to 10 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: 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), 3×SPI/I2S, I2C (SMBus) I/Os: 25, all 5 V-tolerant Low Power: Sleep/Stop/Standby, VBAT backup RTC Package: LQFP-32 (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: Extremely high mixed-signal integration for digital power and motor control LQFP-32 Compact Package: 25 I/Os, ideal for space-constrained designs 4 ADCs + 4 PGAs + 7 Comparators: Rich analog peripherals, no external op-amps/comparators needed, saves significant BOM 72 MHz FPU: Single-cycle DSP and floating-point operations ADC 0.2 µs Fast Conversion Mature STM32 Ecosystem: CubeIDE/CubeMX/HAL/LL
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FAQ:
What is the STM32F303K8T6 and how does it differ from the STM32F303RBT6?
The STM32F303K8T6 is a 72 MHz Arm Cortex‑M4F microcontroller with 64 KB Flash and 16 KB SRAM (including a 4 KB CCM block) in an ultra‑compact LQFP‑32 package. It retains the same high‑speed analog front‑end as the larger RBT6: four 5 Msps 12‑bit ADCs, two DACs, seven comparators, and four PGAs, plus CAN and a USB device controller. The main difference is the package and memory: the RBT6 doubles the Flash to 128 KB, SRAM to 32 KB, and provides 51 I/Os instead of 26. Choose the K8T6 when board space is extremely limited and you only need a few analog inputs and a dedicated control loop, while still demanding full F303‑class analog precision and communication.
Can 64 KB Flash and 16 KB SRAM really run a complete motor control algorithm with CAN and USB?
Absolutely. A focused FOC or six‑step motor control library, a lightweight CANopen stack, and a minimal USB protocol can all fit within 64 KB, especially when you optimize the code for size. The 16 KB SRAM (with 4 KB of zero‑wait‑state CCM) provides enough space for the real‑time control stack, critical variables, and communication buffers. If your firmware outgrows this limit, the pin‑compatible STM32F303RBT6 (128 KB Flash, LQFP‑64) or the STM32F303CCT6 (256 KB Flash, LQFP‑48) can be considered, though they require a larger PCB footprint.
How can the built‑in PGAs and comparators simplify a compact motor drive design?
The four embedded programmable gain amplifiers directly interface with shunt resistors for phase‑current measurement, eliminating external op‑amps and their passive components. The seven fast analog comparators provide cycle‑by‑cycle over‑current protection without extra ICs. In the tiny LQFP‑32 package, this integration is especially critical because it dramatically reduces the number of external components, making a single‑chip motor drive or power converter feasible even on a very small PCB.
How does the STM32F303K8T6 compare to the classic STM32F103C8T6 as an upgrade?
The STM32F103C8T6 is a Cortex‑M3 MCU with a 12‑bit ADC at 1 Msps and no FPU. The F303K8T6 adds a single‑precision FPU, DSP instructions, four 5 Msps ADCs, dual DACs, built‑in PGAs, high‑speed comparators, and a CAN/USB combination, all while staying in a similar 32‑pin footprint. The Flash remains at 64 KB, but the SRAM is now 16 KB with a CCM block. The pin‑out can often be made compatible with minor adjustments, allowing a dramatic performance and analog‑precision upgrade for space‑constrained designs.
When should I pick the STM32F303K8T6 over the STM32F334K8T6? What is the trade‑off?
Both are 32‑pin, Cortex‑M4F devices with a high‑end analog front‑end. The STM32F334K8T6 focuses on digital power with its HRTIM but lacks CAN and has a slightly different PGA/comparator arrangement. The F303K8T6 provides the full F303‑series analog chain and adds a CAN 2.0B interface and a USB device controller. Choose the F303K8T6 when you need CAN or USB communication alongside high‑speed analog acquisition and motor control. Pick the F334K8T6 if you need the HRTIM for precise PWM in lighting or power conversion and do not require CAN/USB.
Does the STM32F303K8T6 have CCM, and how should I use it?
Yes, it includes 4 KB of Core Coupled Memory (CCM) that provides zero‑wait‑state access for the CPU. Use it for the real‑time control stack, critical loop variables, and lookup tables that demand deterministic latency. Because DMA cannot access the CCM, all ADC and communication buffers must reside in the remaining 12 KB system SRAM. Proper CCM usage can significantly reduce control‑loop jitter.
Can the STM32F303K8T6 really use CAN and USB at the same time with only 26 I/O pins?
Yes, with careful pin planning. The CAN TX/RX and USB D+/D‑ pins can be assigned to non‑conflicting locations. However, doing so will consume a significant portion of the available I/Os, so you may need to limit the number of analog channels and other peripherals. STM32CubeMX is essential for validating that your exact configuration fits within the 32‑pin constraint while still providing the necessary PWM outputs and analog inputs for your application.
How fast are the ADCs on the STM32F303K8T6, 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 critical for accurate three‑phase current and voltage measurement. The ADCs are tightly coupled to the advanced timers, enabling automatic triggering at the PWM center or edge with zero CPU overhead, even in the tiny 32‑pin package.
What development tools and libraries support motor control on the STM32F303K8T6?
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 take advantage of the F303’s fast ADCs and PGAs. For evaluation, you can start with a NUCLEO‑F303RE board (64‑pin, software‑compatible) or a small custom breakout, then migrate to the K8T6 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 STM32F303K8T6?
It is ideal for ultra‑compact single‑axis motor drives, miniature power converters, tiny sensor hubs, portable medical devices, and any space‑constrained design that requires a high‑speed mixed‑signal MCU with CAN and USB connectivity. The combination of a rich analog front‑end, a small footprint, and the proven Cortex‑M4F ecosystem makes it a smart choice for high‑volume, cost‑sensitive products where every square millimeter counts.