Equipped with a digital filter for the sigma-delta modulator
512K byte on-chip flash memory provided

STMicroelectronics (hereinafter ST) announced that it has begun mass production of the STM32L45x, an ultra-low-power microcontroller. This product is supported by an ecosystem of development tools based on the easy-to-use and affordable STM32Cube platform.

The STM32L451, STM32L452, and STM32L462 product lines are equipped with a Digital Filter for Sigma-Delta Modulators (DFSDM), enabling advanced audio functions such as noise reduction and sound localization even with low-cost MCUs. With up to 512K bytes of on-chip flash memory and 160K bytes of SRAM provided, sufficient storage space for code and data is ensured.

It is also equipped with a True Random-Number Generator (TRNG) that can simplify the development of security-critical applications, such as networked smart products. The STM32L462 also features an AES-256 encryption hardware accelerator to enhance support for secure product development. In addition, it is equipped with multiple timers, motor control channels, temperature sensors, and capacitive sensing interfaces, and the STM32L452 also features a crystalless USB 2.0 controller.

The development ecosystem includes the STM32CubeMX initialization code generator and middleware, as well as the STM32CubeL4 package containing the Nucleo-64 BSP (Board-Support Package), HAL (Hardware Abstraction Layer), and LLAPI (Low-Layer API). STM32CubeMX features a power prediction wizard to support low-power designs, and additional wizards for managing clock signals and pin arrangements.

The NUCLEO-L452RE (Nucleo-64 board) offers a suitable and flexible way to test new ideas and build prototypes yourself. It integrates the probe-free debugging tool ST-LINK/V2 and allows for functional expansion via Arduino® compatible headers.

The new STM32L4 not only offers features that other ultra-low power MCUs cannot provide, but also boasts excellent core performance and ultra-low power efficiency. With an active mode current consumption of 36µA/MHz, it can operate for extended periods even with small batteries and offers scalability to implement energy-neutral products powered by peripheral sources.