Item specifics
Description
The STM32F334C8T6 is a Cortex-M4 mixed-signal MCU from STMicroelectronics in an LQFP-48 package, purpose-built for digital power and advanced lighting control. It runs at 72 MHz with FPU and ART Accelerator. It integrates 64 KB Flash, 12 KB SRAM, CAN 2.0B, HRTIM (217ps, 10 channels), two 12-bit ADCs (15ch, 0.2µs), three 12-bit DACs, three ultra-fast comparators (25ns), one programmable op-amp (PGA), up to 12 timers (incl. 1 motor control PWM/deadtime), and up to 11 communication interfaces (3×USART/2×SPI/2×I2C/CAN). 37 I/Os, all 5 V-tolerant. Supply 2.0–3.6 V, -40–85 °C. Compared to the STM32F303C8T6, it offers more ADC channels, three DACs, and the unique HRTIM high-resolution timer, making it ideal for digital power and lighting applications requiring high-precision PWM and complex timing.
Core: Arm Cortex-M4 72 MHz + FPU + ART Accelerator Memory: 64 KB Flash, 12 KB SRAM CAN 2.0B: Industrial bus interface HRTIM: 10-channel high-resolution timer, 217ps resolution, supports complex PWM and phase control 2×12-bit ADCs: 15 channels, 0.2 µs, 0–3.6 V 3×12-bit DACs: Buffered output 3 Ultra-Fast Comparators: 25 ns 1 Programmable Op-Amp (PGA): Gain ×2/×4/×8/×16 Timers: 1× motor control PWM (deadtime/emergency stop), 2× 16-bit GP, 1× 32-bit GP, 2× watchdogs, SysTick + HRTIM Communication Interfaces: 3×USART (ISO7816/LIN/IrDA), 2×SPI, 2×I2C (SMBus), 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, digital PFC, LLC resonant converters Advanced Lighting: LED dimming, RGB strips, HID ballasts Motor Control: BLDC/PMSM FOC, fans, pumps (motor control PWM) Industrial Automation: CAN bus nodes Consumer: Inverter-driven home appliances (air conditioners, washing machines)
HRTIM High-Resolution Timer: 217ps resolution, 10 channels, supports complex topologies and precise timing, optimized for digital power Cortex-M4 + FPU + Analog Peripherals: High integration for digital power and lighting control 3 DACs + 3 Comparators + 1 PGA: Rich analog signal chain, no external op-amps/comparators needed, saves BOM CAN 2.0B: Industrial communication support 72 MHz FPU: Single-cycle DSP and floating-point operations ADC 0.2 µs Fast Conversion Mature STM32 Ecosystem: CubeIDE/CubeMX/HAL/LL with dedicated digital power libraries
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FAQ:
What is the STM32F334C8T6 and how does it fit between the K8T6 and R8T6?
The STM32F334C8T6 is a 72 MHz Arm Cortex‑M4F microcontroller with 64 KB Flash, 12 KB SRAM, a High‑Resolution Timer (HRTIM), integrated op‑amps, and fast comparators, all in an LQFP‑48 package. It offers a middle ground: more I/O (up to 37) than the 32‑pin K8T6, but a smaller footprint than the 64‑pin R8T6. This makes it ideal for compact digital power designs that need a few extra HRTIM channels or analog inputs without moving to a larger PCB.
How many HRTIM outputs and analog channels can I actually use on the LQFP‑48 C8T6?
With careful pin mapping, you can typically route 7–9 HRTIM signals (out of the module’s 10 possible) along with both embedded op‑amps, all three fast comparators, the two 12‑bit ADCs (up to 5 Msps), and the two 12‑bit DACs. You still have enough pins left for a USART, SPI, and I2C for communication. Use STM32CubeMX to verify your exact multiplexing and avoid pin conflicts.
Is 64 KB Flash and 12 KB SRAM enough for a complete digital power converter on this chip?
Absolutely. Control algorithms like a 2‑pole‑2‑zero compensator or sensorless FOC core are very compact—often under 16 KB of code. The 64 KB Flash comfortably holds the control loop, communication stack, and startup code. The 12 KB SRAM includes 4 KB of zero‑wait‑state CCM‑SRAM for critical variables, and the FPU with DSP instructions keeps the loop fast and deterministic.
How does the STM32F334C8T6 compare to the STM32F303CCT6? When should I pick the F334?
Both share the same 72 MHz Cortex‑M4F core and LQFP‑48 package, but their analog focus differs. The F303CCT6 emphasizes fast multi‑channel 12‑bit ADCs (up to 5 Msps) and includes a CAN interface. The F334C8T6 replaces some of those ADC channels with the HRTIM, integrated op‑amps, and ultra‑fast comparators. Choose the F334 when your primary need is high‑resolution PWM for digital power, lighting, or inverters; pick the F303 if you require CAN communication or a larger number of external ADC channels.
Can the built‑in op‑amps and comparators on the C8T6 replace external current‑sensing circuitry?
Yes. The two embedded operational amplifiers can be configured as programmable‑gain amplifiers (up to 32×) to directly interface with shunt resistors for current measurement. The three ultra‑fast analog comparators provide cycle‑by‑cycle over‑current protection. This integrated analog front‑end reduces BOM count and PCB area, which is especially valuable in the 48‑pin form factor.
Does the STM32F334C8T6 have CAN or USB? What communication peripherals are available?
No. The STM32F334C8T6, like all F334 devices, lacks a CAN controller and USB peripheral. It focuses on basic industrial serial interfaces: 3× USART, 2× SPI, and 2× I2C. If your design requires CAN or USB, the pin‑compatible STM32F303CCT6 adds those peripherals, though you will lose the HRTIM and the integrated analog front‑end.
How does the STM32F334C8T6 compare with the STM32F103C8T6 for a power supply upgrade?
This is a very common migration. Moving from a Cortex‑M3 with basic PWM to the F334C8T6 gives you the HRTIM with 217 ps resolution, an FPU, DSP instructions, integrated op‑amps, and fast comparators. The control loop performance and efficiency gains are dramatic. The LQFP‑48 package is often similar in size, allowing a compact replacement with minimal PCB changes.
What development tools and libraries support the HRTIM on the STM32F334C8T6?
The HRTIM is fully supported in STM32CubeMX, where you can graphically configure timer channels, link them to ADCs and DACs, and set dead‑times or phase shifts. ST provides the X‑CUBE‑DPOWER digital‑power software pack with ready‑to‑use libraries for buck, boost, and LLC converters. All major IDEs (STM32CubeIDE, Keil, IAR) support the chip.
Can the high‑resolution timer be used for LED dimming or inverter applications?
Yes. The HRTIM’s 217 ps resolution enables flicker‑free, precise dimming for LED drivers, as well as complex PWM patterns for single‑phase or multi‑level inverters. The integrated DACs can generate smooth reference waveforms, while the ADCs and comparators handle closed‑loop feedback, all on the same chip.
What are the most typical applications for the STM32F334C8T6?
It is ideal for compact digital power supplies (AC‑DC adapters, DC‑DC modules), solar micro‑inverters, LED lighting controllers, induction heating, wireless charging, and any space‑constrained design that needs high‑resolution PWM combined with precise analog sensing. Its 48‑pin package hits the sweet spot between I/O count and board area for many mid‑range power products.