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MCUs from ST promise notable performance, power savings

Posted: 17 Feb 2016 ?? ?Print Version ?Bookmark and Share

Keywords:STMicroelectronics? MCU? ARM Cortex? PGA? wearable IoT?

STMicroelectronics has unveiled its latest microcontrollers (MCUs) that boast remarkable performance and power savings. The STM32L4 series devices flaunt peripheral and package configurations that claim to streamline design and enhance flexibility.

According to the EEMBC ULPBench tests for low-power MCUs, the STM32L4 devices achieve 176.70 ULPMark-CP, vaulting over the scores of other major brands, without the help of a buck converter that adds external components such as a coil and capacitor. The EEMBC CoreMark score of 273.55 at 80MHz shows that the STM32L4 series delivers an unrivalled combination of high peak performance and energy efficiency, stated the company.

The performance and efficiency advantages come from smart architectural features such as independently adjustable peripheral supply voltages and a programmable multi-speed internal clock, as well as Batch Acquisition Mode (BAM) and ST's Adaptive Real每Time Accelerator (ART Accelerator). In addition, multiple power-management modes, including ultra每low-power 8nA shutdown, help maximise energy savings.

STM32L4 series

Designers can now access these advantages in six STM32L4 lines that offer economy, various application-targeted features and extra package choices. The STM32L471 combines up to 1Mbyte Flash with rich analogue and audio features for projects that require no LCD controller or USB connectivity. The STM32L475 has a USB OTG Full Speed controller, and both devices have multiple timers, clock sources and communication interfaces including CAN, SDMMC, USART, SPI and I2C. The analogue peripherals include 12bit ADCs with 5MSPS capability and power-saving modes, as well as two 12bit DACs, two op每amps with built-in programmable-gain amplifier (PGA) and two ultra-low-power comparators.

The STM32L432 and STM32L433 bring 100DMIPS ARM Cortex-M4 core performance to lightweight applications that require up to 256Kbyte Flash. Analogue and audio features combine with a crystal-less USB controller in the STM32L432. The STM32L433 additionally features an LCD controller. Both lines support extra package options, from 7mm x 7mm UFBGA100 to 3.14mm x 3.13mm WLCSP49, including the small-footprint UFQPN32 for customers without WLCSP-assembly capability.

In addition, the STM32L442 and STM32L443 lines offer designers the same strong feature sets and flexibility as the STM32L432/433, with the addition of a cryptographic accelerator in each device, the company added.

The extra choices in the STM32L4 series enhance choice and flexibility for designers who need to secure smart connected Internet of Things (IoT) devices such as wearables or home-automation controllers, or need versatile peripherals and connectivity for industrial or medical devices. In addition, guaranteed product availability for more than 10 years makes the STM32L4 series ideal for smart metres, also benefiting from the wide temperature range and high on-chip memory density to achieve a robust single每chip solution.

Budgetary pricing is from $2.13 for the STM32L432KBU6 with 128Kbyte Flash and 64Kbyte SRAM in QFN-32 package, for orders of 10,000 pieces. The lines are scheduled to enter volume production during 1Q16 and 2Q16.

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