STMicroelectronics introduces the STM32U3 as its first STM32 microcontroller family built on a sub-threshold (near-threshold) design, where the core logic runs from a VCORE as low as 0.65 V instead of the traditional 1.2 V. This Arm Cortex-M33 MCU line targets ultra-low-power designs while still delivering up to 1 MB dual-bank flash, 256 KB SRAM, TrustZone security and rich analog and digital peripherals for connected devices, sensors and metering. The near-threshold architecture cuts dynamic current to around 9.5–10 µA/MHz and achieves about 117 CoreMark/mW, enabling long battery life in cost-sensitive industrial, medical, and consumer devices.https://www.st.com/en/microcontrollers-microprocessors/stm32u3-series.html
—
HDMI® Technology is the foundation for the worldwide ecosystem of HDMI-connected devices; integrated with displays, set-top boxes, laptops, audio video receivers and other product types. Because of this global usage, manufacturers, resellers, integrators and consumers must be assured that their HDMI® products work seamlessly together and deliver the best possible performance by sourcing products from licensed HDMI Adopters or authorized resellers. For HDMI Cables, consumers can look for the official HDMI® Cable Certification Labels on packaging. Innovation continues with the latest HDMI 2.2 Specification that supports higher 96Gbps bandwidth and next-gen HDMI Fixed Rate Link technology to provide optimal audio and video for a wide range of device applications. Higher resolutions and refresh rates are supported, including up to 12K@120 and 16K@60. Additionally, more high-quality options are supported, including uncompressed full chroma formats such as 8K@60/4:4:4 and 4K@240/4:4:4 at 10-bit and 12-bit color.
—
In this video, ST’s marketing team uses a smart-home style demo to show how a single STM32U3 platform can be tuned for very different power profiles. Four STM32U3 boards emulate an electronic energy meter, a smart doorbell at the entrance, a wearable device, and a smoke detector, each configured with its own duty cycles, sleep modes and wake-up patterns. The goal is to illustrate how developers can trade off active current, standby current, and response time using the same MCU family for metering, building automation, wearables and safety sensors.
Filmed at Embedded World North America 2025, the setup routes all edge nodes to a gateway based on an STM32H7R, which aggregates live current-consumption data from each STM32U3 node and renders dashboards on an HMI display. The H7R platform, implemented on a 14 nm process and optimized for graphics and cost-effective IoT, makes it easier to visualize how near-threshold operation impacts energy per task and remaining battery budget in real deployments.
Beyond the live demo, the STM32U3 series is positioned as part of ST’s broader ultra-low-power roadmap, extending the STM32L and STM32U lines with significantly lower dynamic and stop currents than previous generations such as STM32U5 and STM32L4.([STMicroelectronics][3]) Features like AI-assisted adaptive voltage scaling at wafer level, integrated audio digital filters for sound-activity detection, capacitive-touch channels, advanced timers and I3C connectivity are designed for always-on sensing, smart metering, voice-triggered devices and battery-powered nodes deployed for years in the field.
Security is also a key focus: the Cortex-M33 with TrustZone is complemented by hardware cryptography, secure storage/keystore and the security features inherited from STM32U5, aiming to meet modern IoT certification requirements even in tiny, low-duty-cycle devices.([Tiger Brokers][5]) In short, the video gives a hands-on tour of how STM32U3’s sub-threshold design and tooling can help engineers design energy-efficient smart-home, industrial and wearable products without changing MCU families across use cases.
I’m publishing about 90+ videos from Embedded World North America 2025, I upload about 4 videos per day at 5AM/11AM/5PM/11PM CET/EST. Join https://www.youtube.com/charbax/join for Early Access to all 90 videos (once they’re all queued in next few days) Check out all my Embedded World North America videos in my Embedded World playlist here: https://www.youtube.com/playlist?list=PL7xXqJFxvYvjgUpdNMBkGzEWU6YVxR8Ga
This video was filmed using the DJI Pocket 3 ($669 at https://amzn.to/4aMpKIC using the dual wireless DJI Mic 2 microphones with the DJI lapel microphone https://amzn.to/3XIj3l8 ), watch all my DJI Pocket 3 videos here https://www.youtube.com/playlist?list=PL7xXqJFxvYvhDlWIAxm_pR9dp7ArSkhKK
Click the “Super Thanks” button below the video to send a highlighted comment under the video! Brands I film are welcome to support my work in this way 😁
Check out my video with Daylight Computer about their revolutionary Sunlight Readable Transflective LCD Display for Healthy Learning: https://www.youtube.com/watch?v=U98RuxkFDYY



