STMicroelectronics has introduced a new embedded memory solution—called xMemory—within its Stellar series of automotive microcontrollers. This development is aimed at simplifying the design and software management of next-generation vehicles, including electric and software-defined models.
Traditionally, automotive software platforms have required different microcontroller units (MCUs) depending on memory needs, often resulting in higher costs and longer development cycles. The new xMemory approach enables carmakers to use a single MCU with scalable memory, which can be extended during development or after vehicles are in the field. This change helps reduce hardware redesign, streamlines production logistics, and supports over-the-air software updates without needing a hardware replacement.
The xMemory feature will first be available in the Stellar P6 line, designed for electric drivetrain applications. Production is expected to begin in 2025.
Luca Rodeschini, a senior executive at STMicroelectronics, noted that the technology is intended to simplify system architecture, reduce development time, and support long-term innovation without requiring changes to hardware. The embedded Phase Change Memory (PCM) used in these microcontrollers offers performance and flexibility advantages over other non-volatile memory types like RRAM and MRAM.
Industry leaders such as Bosch and analysts from Moor Insights & Strategy have also commented on the benefits of xMemory. They highlight its role in enabling more adaptable platforms that can support software updates and growth, without the usual cost and time impacts of redesigning hardware.
The increased complexity of automotive software—driven by AI features, regulatory changes, and connected services—has made memory capacity a growing concern. By offering a way to expand memory as needed, the Stellar platform aims to help carmakers meet these challenges while keeping production costs under control.
From a technical standpoint, ST’s xMemory is based on its 28nm embedded Phase-Change Memory, which provides higher memory density and better performance-to-area efficiency than other options. These memory cells, fabricated using 18nm and 28nm processes, allow more memory to be integrated within the same silicon footprint.
ST’s broader Stellar MCU lineup supports a range of applications in modern vehicles. The Stellar P and G series focus on centralizing electronic control systems across zones and domains, while the Stellar E series targets power management in electric drivetrains.
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