STM32L4 MCUs gain on-chip digital filter for audio apps
STM32L451, STM32L452, and STM32L462 integrate a digital filter for sigma-delta modulators (DFSDM), enabling advanced audio capabilities such as noise cancellation or sound localization on an inexpensive microcontroller. There is up to 512 kByte on-chip Flash and 160 kByte SRAM.
These MCUs also feature a True Random-Number Generator (TRNG) that streamlines development of security-conscious applications such as connected smart devices. The STM32L462 integrates an AES-256 cryptographic hardware accelerator.
Other features include smart analogue peripherals such as a 12-bit 5 Msample/sec ADC, internal voltage reference, and ultra-low-power comparators. There are multiple timers, a motor-control channel, temperature sensor, a capacitive-sensing interface, and the STM32L452 also has a crystal-less USB2.0 controller.
The development ecosystem includes the STM32CubeMX initialization-code generator and STM32CubeL4 package comprising middleware components, Nucleo-64 Board-Support Package (BSP), 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, integrates the ST-LINK/V2 probe-free debugger/programmer and can be expanded via Arduino-compatible headers.
STM32L4’s EEMBC CoreMark score of 273 outperforms other ultra-low-power cores, while the ULPBench score of 245 confirms greater energy efficiency. Active-mode current is 36 µA/MHz.
In small-form-factor packages from QFN-48 to LQFP-100, including a 3.36 x 3.66 mm WLCSP, prices start from $2.773 for the STM32L451CCU6 with 256 kBytes Flash and 160 kBytes SRAM in QFN-48 (10,000). Prices for development boards start at $14 for the legacy-compatible Nucleo-64 board (NUCLEO-L452RE)
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