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    New STMicroelectronics MCU with True Random Number Generator for Designing Smart Security Devices

    STMicroelectronics has begun volume production of ultra-low-power STM32L45x microcontrollers (MCUs), supported by a development ecosystem based on the easy-to-use and affordable STM32Cube platform.

    The STM32L451, STM32L452, and STM32L462 lines integrate a Digital Filter for Sigma-Delta Modulators (DFSDM), enabling advanced audio capabilities such as noise cancellation or sound localization on an inexpensive microcontroller. Up to 512 Kbyte, on-chip Flash and 160 Kbyte SRAM provide generous code and data storage.

    The new MCUs also features 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 5Msample/s 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 clocks signals and pin assignments.

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

    Offering features unavailable in other ultra-low-power MCUs, the new STM32L4 devices deliver both high core performance and outstanding ultra-low-power efficiency. The EEMB CoreMark score of 273 outperforms other ultra-low-power cores, while the ULPBench score of 245 confirms greater energy efficiency. Active-mode current of just 36µA/MHz enables longer run time on small batteries and extends the scope to create energy-neutral products powered from ambient sources.

    Devices can be ordered now, in small-form-factor packages from QFN-48 to LQFP-100, including a 3.36mm x 3.66mm WLCSP. Prices start from $2.773 for the STM32L451CCU6 with 256 KBytes Flash and 160 KBytes SRAM in QFN-48, for orders of 10,000 pieces. Prices for development boards start at $14 for the legacy-compatible Nucleo-64 board (NUCLEO-L452RE), which is available now. The NUCLEO-L452RE-P board with external DC/DC converter will be available to distributors in June 2017.

    For further information, please visit www.st.com/stm32l452

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