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IoT MCUs Boast Security and Ultra-Low Power

STMicroelectronics has announced its ultra-low-power
STM32L5x2 microcontrollers (MCUs) that emphasize security to assure better
protected IoT-connected applications. Operating at clock frequencies to 110MHz,
the STM32L5-series MCUs start from the Arm Cortex-M33 32-bit RISC core with Arm
TrustZone hardware-based security. First conceived for equipment such as desktops,
mobile devices, and communication infrastructure, trusted computing
authenticates devices connected to a network by creating a protected execution
environment for cyber-protection and sensitive code (cryptography and key
storage) that blocks attempts to corrupt devices or software. A second,
independent, execution environment allows for the running of untrusted code.

To this foundation, ST adds the freedom to include or
exclude each I/O, peripheral, or area of Flash or SRAM from TrustZone
protection, allowing sensitive workloads to be fully isolated for maximum
security. In addition, ST has engineered TrustZone to ensure support for secure
boot, special read-out and write protection for integrated SRAM and Flash, and
cryptographic acceleration, including AES 128/256-bit key hardware
acceleration, public key acceleration (PKA), and AES-128 On-The-Fly Decryption
(OTFDEC), to protect external code or data. The STM32L5 also supports active
tamper detection and secure firmware installation. With this attention to
security, the STM32L5 has been certified to PSA Certified Level 2.

The device also mixes in ST’s proprietary ultra-low-power
expertise through techniques like adaptive voltage scaling, real-time
acceleration, power gating, and multiple reduced-power operating modes, to
enable the MCUs to deliver high performance and long run-times, whether powered
by coin cells or even through energy harvesting. In addition, a highly
efficient switched-mode step-down regulator can be powered up or down
on-the-fly to improve low-power performance when the VDD voltage is high
enough. The resulting ULPMark scores, which are key measures of ultra-low-power
efficiency based on real-world benchmarks developed by EEMBC, are excellent:
370 ULPMark-CoreProfile and 54 ULPMark-PeripheralProfile at 1.8V.

The STM32L5x2 MCUs offer 512KB dual-bank Flash that
allows read-while-write operation to aid device management and the Flash
ensures a high level of safety by supporting Error Correction Code (ECC) with
diagnostics. There is also a 256KB-SRAM and features to support high-speed
external memory including single, dual, quad or octal SPI and Hyperbus flash or
SRAM, and an interface for SRAM, PSRAM, NOR, NAND or FRAM.

Digital peripherals for the STM32L5x2 include USB Full
Speed with dedicated supply, allowing customers to keep USB communication even
when the system is powered at 1.8V, and a UCPD controller compliant with USB
Type-C Rev. 1.2 and USB Power Delivery Rev. 3.0 specifications. Smart analog
features include a state-of-the-art analog-to-digital converter (ADC), two
power-gated digital-to-analog converters (DAC), two ultra-low-power
comparators, and two operational amplifiers with external or internal follower
routing and programmable-gain amplifier (PGA) capability.

As part of the industry-leading STM32 family of MCUs, the
STM32L5 series is fully supported by the STM32 ecosystem and features its own
STM32CubeL5 one-stop-shop software package, which includes Hardware Abstraction
Layer and Low-Level drivers, FreeRTOS, Trusted Firmware-M (TF-M), Secure Boot
and Secure Firmware Update (SBSFU), USB-PD device driver, MbedTLS and
MbedCrypto, FatFS file system, and Touch Sensing drivers.

In addition, the STM32CubeL5 features more than 300 project examples that can run on the STM32L552E-EV evaluation board, STM32L562E-DK discovery kit, and NUCLEO-L552ZE-Q. These projects can be compiled with the Arm Keil development tool, IAR or STM32CubeIDE toolchains, and are delivered with a STM32CubeMX configuration file, enabling easy customization and code update.

Starting at $2.60 in 1k quantities, the STM32L5x2 MCUs
are in full production and available now in standard temperature grade (-40°C
to +85°C) for consumer and commercial applications, or high-temperature grade
specified from -40°C to +125°C for challenging environments.

STMicroelectronics |

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IoT MCUs Boast Security and Ultra-Low Power

by Circuit Cellar Staff time to read: 2 min