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STM32L4+ MCU for smart embedded applications

The STM32L4P5 and STM32L4Q5 microcontrollers (MCUs) from STMicroelectronics look to bring the performance of the Arm Cortex-M4 core to cost-sensitive and power-conscious smart connected devices.

Devices including utility meters, industrial and medical sensors, fitness trackers, and smart-home products will benefit from the STM32L4+'s improved performance and economy.

With a compact 10mm x 10mm 64-pin and 7mm x 7mm 48-pin package options available, designers will be able to tackle applications limited by size constraints such as wearable form factors.

The device comes with independent power connections for circuitry such as USB and analogue peripherals, independent clock domains, and Octal and Quad SPI interfaces for external memory expansion. It also feature a 5Msample/s smart analogue-to-digital converter (ADC) that can operate at full speed to minimise acquisition time, or at reduced speed with lower current.

The MCU also features seven main low-power modes that will let designers manage power consumption and wake-up times more creatively, minimising energy demand. The device also supports FlexPowerControl, which ensures energy-efficient handling of processing loads, as well as Batch Acquisition Mode for energy-efficient data capture while the CPU is stopped.

EEMBC benchmark scores of 409 CoreMark and 285 ULPMark-CP have helped to confirm the high performance and energy efficiency these microcontrollers are able to deliver.

There are also features to preserve system reliability and safety in industrial and medical applications, including Flash error-correcting code (ECC) support and hardware parity checking for SRAM.

Cyber-protection features include a True Random Number Generator and IP protection through limited access to code stored in internal memory. STM32L4Q5 devices feature additional cryptographic accelerators that support AES, RSA, DH and ECC acceleration.

Author
Neil Tyler

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