The ultra-low power STM32L552 and STM32L562 microcontrollers from STMicroelectronics offer a broad range of security capabilities for OEMs to create better protected IoT-connected applications.
Operating at clock frequencies up to 110 MHz, the STM32L5 series products are based on the Arm® Cortex®-M33, a security-specialist processor core which gives MCUs the ability to implement Arm TrustZone® hardware-based security. The TrustZone trusted computing platform creates a protected execution environment for connected products and their sensitive code such as key storage, thus blocking attempts to corrupt devices or software. A second, independent execution environment allows for the running of untrusted code.
An MCU which has TrustZone capability is already a strongly protected device, but ST has added the ability to include or exclude each I/O, peripheral, or area of Flash or SRAM from TrustZone protection. This allows sensitive workloads to be fully isolated for maximum security.
In addition, ST has built on the TrustZone capabilities to add:
The MCUs also feature active tamper detection and secure firmware installation. This comprehensive set of security features and capabilities has enabled ST to gain PSA Certified Level 2 status for the STM32L552 and STM32L562.
These security capabilities are combined in the STM32L5x2 devices with ultra-low power performance to enable the MCUs to deliver high operating speed and long run-times, whether powered by coin cells or even through energy harvesting. Low-power techniques deployed in the MCUs include:
The STM32L552E-EV is a complete development platform demonstrating the Arm TrustZone features and the ARMv8-M mainline security extension.
This STM32 Nucleo-144 development board features an STM32L552ZE MCU, switch-mode power supply, and Arduino, ST Zio and morpho connectivity.
The STM32L562E-DK Discovery kit makes use of the STM32L562QEI6QU ultra-low power features to enable prototyping for many wearable or sensor applications.
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