Low power Arm Cortex-M33 STM32U3 MCUs from STMicro: 1.6µA stop current and 117 Coremark/mW

STMicroelectronics a well known source for extreme low power and robust MCUs for ultra-low-power applications announced latest Arm Cortex-M33 core based STM32U3 MCUs running at up to 96MHz. These UFQFPN, WLCSP, LQFP, and UFBGA packaged MCUs deliver Coremark-per-milliwatt score of 117, nearly double the efficiency of ST’s preceding STM32U5 series, and five times that of the STM32L4 series.

Deliver dynamic power savings down to 10µA/MHz and low stop current of 1.6µA. The transistor in these chips operates at extremely low voltage by pushing them to operate near threshold, where ST uses AI-driven adaptive voltage scaling at wafer level to compensate for process variations in the foundry. STM32U3 embeds up to 1MB of Flash memory dual-bank and 256kB of SRAM.

STM32U3 MCUs embed all successful security features of the STM32U5, with additional keystore capabilities. Newly, secret keys are loaded in-factory by ST on the STM32U3 MCUs and are protected by a coupling and chaining bridge (CCB), representing the first use of this technology in the STM32 MCU family. SESIP3 and PSA Level3 certifiable security assets, such as cryptographic accelerators, TrustZone isolation, random generator, and product lifecycle help in compliancy towards the upcoming RED and CRA regulations.

Two product lines are available, presenting a choice of MCUs either with or w...