STMicroelectronics STM32L4+ microcontrollers

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STMicroelectronics’ STM32L4P5 and STM32L4Q5 microcontrollers (MCUs) bring the performance of the Arm Cortex-M4 core to power-conscious smart connected devices, including utility meters, industrial and medical sensors, fitness trackers and smart-home products.

With memory density down to 512 KB Flash and 320 KB SRAM, the STM32L4+ MCUs are designed to deliver performance with economy. Compact 10 x 10 mm 64-pin and 7 x 7 mm 48-pin package options let designers tackle applications limited by size constraints such as wearable form factors.

Flexibility comes in the form of independent power connections for circuitry such as USB and analog peripherals, independent clock domains, and Octal and Quad SPI interfaces for external memory expansion. The devices also feature a 5 MS/s smart analog-to-digital converter (ADC) that can operate at full speed to minimise acquisition time, or at reduced speed with lower current.

Leveraging ST’s ultralow-power microcontroller technologies, the MCUs feature seven main low-power modes that let designers creatively manage power consumption and wake-up times to minimise energy demand. The devices also support FlexPowerControl, which ensures energy-efficient handling of processing loads, as well as Batch Acquisition Mode for energy-efficient data capture while the CPU is stopped.

EEMBC benchmark scores of 409 CoreMark and 285 ULPMark-CP confirm a strong combination of high performance and energy efficiency. There are also features to preserve system reliability and safety in industrial and medical applications, including Flash error-correcting code (ECC) support and hardware parity checking for SRAM.

Cyber-protection features include a true random number generator and IP protection through limited access to code stored in internal memory. STM32L4Q5 devices feature additional cryptographic accelerators that support AES, RSA, DH and ECC acceleration.

Leveraging the STM32Cube ecosystem, the STM32L4P5 and STM32L4Q5 are supported by the STM32CubeL4 MCU package, which contains hardware abstraction layer and low-layer (HAL/LL) peripheral drivers, middleware components and example projects, and the STM32CubeMX initialisation-code generator and configurator, which has an easy-to-use power consumption calculator for ultralow-power design.

For more information: https://www.st.com/stm32l4plus.