STMicroelectronics STM32U5 Series of Ultra-Low-Power MCUs

STMicroelectronics STM32U5 Series of Ultra-Low-Power MCUs are advanced power-saving microcontrollers based on the Arm® Cortex®-M33. The devices meet the most demanding power/performance requirements for smart applications. These applications include wearables, personal medical devices, home automation, and industrial sensors. The STM32U5 series of microcontrollers takes performance to the next level with up to 2Mbytes of Flash (dual bank) memory and 786Kbytes of SRAM. The STM32U5 is a large portfolio with 8 packages (from 48 to 169 pins) and supports up to 125°C ambient temperature.

Enabling best-in-class power consumption

Energy benchmark:
- 535 ULPMark-CP
- 149 ULPMark-PP
- 133000 SecureMark-TLS
LPBAM (Low Power Background Autonomous Mode), an innovative autonomous power mode, saves power by enabling direct memory access (LPDMA Low Power Direct Memory Access) and ensuring the peripherals keep working while most of the device is in stop mode.
Embedded SMPS (Switched-Mode Power Supply) step-down converter (optional)
Key performance indicators include:
- 110nA in shutdown mode
- 300nA in standby mode
- 1.7µA in stop mode 3 with 16Kbytes of SRAM
- 6.6µA in stop mode 2 with 786Kbytes of SRAM
- Down to 19µA/MHz in active mode

Enhanced security

Building on the cybersecurity features of the STM32L5 MCU, with its Arm Cortex-M33 core that incorporates Arm’s TrustZone® technology and an ST-specific security feature set, the STM32U5 series introduces state-of-the-art innovations:

AES encryption and Public Key Accelerator (PKA) are now side-channel hardware-resistant
Secure data storage with a Hardware Unique Key (HUK)
Active tamper detection. Internal monitoring, which can erase secret data in the event of perturbation attacks, helps meet the PCI Security Standards Council (PCI SSC) requirements for Point Of Sales (POS) applications.
Targeting PSA and SESIP (Security Evaluation Standard for IoT Platforms) assurance level 3

Integration, size, and performance

Ensures enhanced application responsiveness:
- Arm Cortex-M33 running at 160MHz
- New ST ART Accelerator: working both on internal and external Flash (8 Kbytes of instruction cache)
- 240 DMIPS and 651 CoreMark scores
Up to 0.5 Mbytes of on-chip Flash offers increased cycle life, up to 100,000 read/write cycles to ensure reliable storage of user data.
High integration and innovation: large memory with ECC on Flash and SRAM, USB Type-C w/power delivery controller, CAN FD, 14- and 12-bit ADC, Multi-function Digital Filter (MDF), and Audio Digital Filter (ADF)
Large portfolio: 8 package types (LQFP48, QFN48, LQFP64, WLCSP90, LQFP100, UFBGA132, LQFP144, and UFBGA169)