STMicroelectronics STM32L4 MCUs with an on-chip digital filter

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STMicroelectronics has begun production of its ultralow-power STM32L45x microcontrollers (MCUs), supported by a development ecosystem based on the easy-to-use STM32Cube platform.

The STM32L451, STM32L452 and STM32L462 lines integrate a digital filter for sigma-delta modulators (DFSDM), enabling audio capabilities such as noise cancellation or sound localisation. Up to 512 kB on-chip Flash and 160 kB SRAM provide generous code and data storage.

The MCUs also feature a true random-number generator (TRNG) that streamlines development of security-conscious applications such as connected smart devices. The STM32L462 further enhances support for developing secure devices by integrating an AES-256 cryptographic hardware accelerator.

Other features include smart analog peripherals such as a 12-bit 5 MS/s ADC, internal voltage reference and ultralow-power comparators. There is a motor-control channel, a temperature sensor and a capacitive-sensing interface, along with multiple timers. The STM32L452 also has a crystal-less USB 2.0 controller.

The development ecosystem includes the STM32CubeMX initialisation-code generator and STM32CubeL4 package comprising middleware components, a Nucleo-64 board-support package (BSP), a hardware abstraction layer (HAL) and low-layer APIs (LLAPIs). STM32CubeMX has a power-estimation wizard that assists low-power design and additional wizards for managing clock signals and pin assignments.

The Nucleo-64 board, NUCLEO-L452RE, provides a flexible way for users to try out ideas and build prototypes. It integrates the ST-LINK/V2 probe-free debugger/programmer and can be expanded via Arduino-compatible headers.

For more information: www.st.com/stm32l452.