Built on the Arm® Cortex®‑M33 core, the STM32U3B5/U3C5 MCUs combine up to 2 Mbytes of dual‑bank flash memory with 640 Kbytes of RAM and are available in packages from 48 to 144 pins (UFQFPN, WLCSP, LQFP, and UFBGA).
The lines introduce a hardware signal processor (HSP) to the STM32U3 portfolio, offloading complex DSP and edge‑AI workloads and improving performance, efficiency, and security, all while remaining optimized for compact, battery‑powered devices.
To support evaluation and rapid prototyping, the new NUCLEO‑U3C5ZI‑Q Nucleo board is also available.
1. High‑performance DSP and what this means for you:
- Much faster DSP execution compared to Cortex®-M33 alone
- Smoother real‑time analytics
- Higher sampling rates
- More CPU headroom for your application logic
Key improvements
- Up to 12× faster DSP workloads (vs Cortex‑M33 alone)
- Around 3× boost in overall DSP performance (vs Cortex‑M55)
- Best‑in‑class FIR/RFFT acceleration
- Significantly better DSP power efficiency while staying ultra‑low‑power
2. Edge AI, now more efficient
By accelerating key DSP operations used in optimized AI models, HSP helps make edge AI faster and more energy‑efficient.
Benefits
- Faster local intelligence without increasing power budget
- More responsive models for sensing, detection, and classification
- Better support for continuous, battery‑powered AI scenarios
Key improvements
- 4-6× faster NanoEdge AI models vs. the same models running on a Cortex®-M33 without HSP
- Up to 2× lower energy for AI workloads
- CNNs optimized with STM32Cube AI Studio accelerated with x3 to x5 speed‑ups depending on the framework
3. Easier migration, same software flow
You get higher performance without rewriting everything:
- Same CMSIS‑DSP API for code reuse
- HSP supported across the STM32 AI software ecosystem
- Firmware reuse across the STM32U3 family
4. Robust security for connected devices
Designed for sensitive and mission‑critical applications:
- PSA Certified L3 & SESIP3 targets
- Advanced, ready-to-use security mechanisms for a simplified approach to implementing security:
- Ready‑to‑use security mechanisms
- Key hardware protection provided by the couple and chaining bridge (CCB) HAL
- Ensures product authenticity with in-factory provisioned attestation
- Side‑channel‑resistant crypto engine
Discover this new line of products here.
