ST Enhances Cortex-M0+ MCUs with Power Cuts and Security Features

STMicroelectronics is making significant strides in power consumption and security with its latest range of 56MHz Arm Cortex-M0+ microcontrollers. Known as STM32U0, these MCUs are designed to reduce energy consumption by up to 50% compared to previous product generations, enabling more designs to operate battery-free, relying solely on energy-harvesting systems like small photovoltaic cells.

One of the key features of the STM32U0 series is the emphasis on low power consumption. For example, the STM32U083xC model operates within a voltage range of 1.71 to 3.6V and consumes just 130nA in battery-backed mode with the real-time clock and nine 32-bit registers active. In run mode, the power consumption is 52μA/MHz, while in shut-down mode with six wake-up pins active, it can drop to as low as 16nA.

To further enhance power efficiency, the STM32U0 microcontrollers come equipped with two on-board linear regulators - one for high-speed operation up to 56MHz and another for low-power operation up to 2MHz. Additionally, clock sources are plentiful, offering options such as crystal oscillators and adjustable RC-clocks for precise power consumption tuning.

STMicroelectronics has also prioritized security in the design of the STM32U0 devices. These MCUs are the first to run on Arm Cortex-M0+ architecture targeting SESIP Level 3 and PSA Level 1, focusing on firmware code protection. This certification provides assurance to product manufacturers looking to comply with upcoming cybersecurity standards like the US Cyber Trust Mark and the EU Radio Equipment Directive.

For user interface capabilities, the STM32U0 series features multiple capacitive sensing channels and an LCD controller suitable for segment displays. Analog peripherals include ADCs, DACs, operational amplifiers, and analog comparators with rail-to-rail inputs. The range of timers available in these microcontrollers caters to various application needs, from general-purpose timers to PWM controllers dedicated to motor control.