STMicro MCUs Aim to Redefine Entry-Level Performance

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STMicroelectronics (STMicro) today introduced a new family of entry-level microcontrollers (MCUs), the STM32C5 series, which the company said redefines entry-level MCU performance and cost-efficiency, utilizing the Arm Cortex-M33 to deliver an all-in-one device containing more peripherals and performance than a typical Cortex M0+, all less than one dollar.

Targeting the launch ahead of embedded world 2026 in Nuremberg, Germany, STMicro’s Patrick Aidoune, responsible for general purpose and automotive microcontrollers, told EE Times, “Today, what we have announced is mainstream MCUs that are higher in performance, without impacting cost. This product class and price point is very aggressive, enabled by our own 40 nm technology and a very dense digital design. No external accelerators are required, and it provides three times more performance than the competition’s Cortex-M0 based devices available in the market.”

In our discussion, Aidoune emphasized the significance of the new STM32C5 MCUs, whereby an entry-level device can run tasks faster than many entry-level chips used today.  The cost efficiency is achieved by implementing the Arm Cortex-M33 core in STMicro’s proprietary 40-nm manufacturing process, which supports higher clock speed and enables memory above 512Kbyte where lower density technologies are uncompetitive. Features like the floating-point unit and integrated digital signal processing instructions mean that the new MCUs can run applications faster and run significantly more complex code.

In a blog published to coincide with the launch, STMicro said this results in being able to process a finite impulse response using 32-bit floating point operations about 40× faster. Consequently, an entry-level device can now run audio processing software, sensing applications, current measurements for motor control loops, or frequency responses in communication protocols with “far greater ease.” The improved arithmetic performance enabled by the combination of the M33 core with the 40-nm process technology helps accelerate computations like embedded digital filters in sensor signal conditioning, noise suppression, and debouncing.

The new STMicro MCUs come with on-chip Flash from 128Kbyte, and devices are available with up to 1Mbyte. The MCUs target SESIP3 and PSA Level 3 security certifications, with memory protection, tamper protection, cryptographic engines (symmetrical encryption with AES and hashing algorithm), and temporal isolation (HDP) to protect processes like secure boot and firmware update. The STM32C59x and STM32C5A3 variants have additional security, including hardware unique key support, secure key storage, and hardware cryptographic accelerators for symmetric and asymmetric operations with protection against side-channel attacks.

Industrial applications and smart appliances are first to utilize the MCU

Aidoune told EE Times that the entry-level price point combined with performance and security meant that this opens up the possibilities for many applications that were previously limited by the capabilities of entry-level MCUs. Industrial applications and smart appliances are key targets, with applications ranging from industrial smart sensors and robotic actuators to smart thermostats, electronic door locks, and smart wearable electronics.

He cited Circontrol as one of their early customers, who make EV charging solutions. The company incorporated the STM32C5 for its next generation AC charger. Aidoune said a key reason that Circontrol chose the new MCUs is because of the security offered in the device The next reason was cost-efficiency. Aidoune said other areas in which STMicro is seeing interest are laptop keyboards where more performance was needed and smart appliances.

Development environment enhanced

Enhancements to the development ecosystem include a new STM32CubeMX flavor, STM32CubeMX2, which introduces a preview feature that allows faster access to reference code to accelerate development and ease code reuse. Also new in the STM32CubeC5 embedded software offer, the latest code-size optimized hardware abstraction layer (HAL2), gives access to all MCU features and allows more of the MCU’s memory to be used for application code. A new example library is also available, offering faster access to a large number of STM32C5 production-ready code examples, simplifying the use of the STM32C5 features.

With prices starting at $0.64 for orders of 10,000 units, STM32C5 MCUs are entering production now, and targeting packages from 3mm x 3mm UFQFPN20 to 20mm x 20mm LQFP144. For development, STM32 Nucleo evaluation boards, and a display extension board from Riverdi with TouchGFX development software for building entry-level graphical user interfaces, are ready to assist development.

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