Stellar P3E
The first automotive MCU with an embedded NPU accelerator
An AI-powered automotive microcontroller
"Stellar P3E sets a new benchmark for automotive electrification by combining high-performance real-time control and edge AI in a single device that meets the highest automotive safety levels. This innovation empowers our customers to deliver safer, smarter, and more efficient X-in-1 solutions for the next generation of electric vehicles,”
said Luca Rodeschini, GP and Auto MCU General Manager at STMicroelectronics.
As vehicle mobility shifts toward highly integrated powertrain architectures – consolidating engine control, inverters, OBCs, and DC-DC converters into unified systems for hybrid and electric vehicles – microcontrollers must aggregate more functions and deliver significantly higher intelligence within the same footprint.
Stellar P3E answers this with:
Stellar P3E answers this with:
- Safe compute with hardware isolation
- Extensible xMemory enabling SDV innovations
- Embedded AI acceleration with Neural-ART™ accelerator
- Smart power enabling more efficient automotives
Stellar P3E redefines powertrain intelligence
Stellar P3E shifts control from reactive to adaptive by integrating the ST Neural-ART™ Accelerator, a dedicated neural processing unit (NPU) embedded directly in silicon, enabling instantaneous AI inference that creates “smart” virtual sensors for higher-performance, more reliable powertrain control without additional hardware. By offloading AI workloads from the main cores, this NPU significantly accelerates inference execution without compromising real-time behavior or functional safety.
Stellar P3E combines a multi-core cluster of high-performance Arm® Cortex®-R52+ processors with hardware-enforced virtualization, enabling freedom from interference between software functions and more efficient consolidation of workloads. This architecture enhances responsiveness and supports safer, more deterministic behavior in modern automotive systems.
In the software-defined vehicle (SDV) era, memory is a key driver of innovation. Stellar P3E integrates extensible xMemory based on phase-change memory (PCM) technology, delivering up to twice the density of traditional embedded flash and ensuring robust, automotive-qualified performance to support evolving software features throughout the vehicle’s lifetime.
“With the new Phase Change Memory (PCM) flash technology and advanced features, like Neural-ART for edge AI, Stellar P3E is a remarkable product well-suited to meet the growing demands of new energy vehicle applications,”
said Zhang JianBiao, General Manager, Dr. Octopus Intelligent Technology.
Why put AI deep inside the ECU?
Modern powertrain architectures require high-performance, real-time intelligence. Stellar P3E with its embedded NPU accelerator handles complex multi-sensor data directly at the actuation level. This enables functions such as predictive maintenance and anomaly detection for battery and combustion systems – identifying potential failures before they manifest. Furthermore, its virtual sensing can emulate physical sensors in inaccessible locations (e.g., inside an engine block) to provide unprecedented insights. This software-driven approach reduces hardware and complexity, boosting reliability and improving efficiency and range without compromising real-time behavior or safety.
Replace position sensors and emulate thermal sensors with high-fidelity AI models running on the neural processing unit (NPU).
Increase reliability while reducing bill of materials (BOM) cost and weight.
Analyze sensing and current signatures at the source to detect bearing wear, anode oxidation, and thermal anomalies months before they cause a failure.
Offload complex matrix computations to the NPU for higher performance, lower power consumption, and more CPU headroom.
Enable real-time optimization of switching frequencies to extend electric vehicle (EV) range through improved efficiency.
AI, compute, and safety, in one MCU
- >20× acceleration to achieve sub-ms inference
- Improved lifetime through predictive maintenance
- Higher efficiency for AI-augmented motor control
- 500 MHz Arm® real-time Cortex®‑R52+ compute
- Split-lock feature to balance safety and maximum performance
- New smart low-power modes beyond traditional stand-by
Stellar P3E: Powering the evolution of modern vehicle architecture
The Stellar P3E is engineered to master the complexities of high-integration and peak efficiency across the entire automotive spectrum. Whether optimizing internal combustion engines (ICE), managing hybrid transitions, or powering full electric vehicle (EV) platforms, the P3E consolidates multiple ECUs into a single, streamlined solution. By enabling smart sensing and high-performance processing, it delivers the intelligence required for the next generation of modern vehicle architectures:
- Consolidate power, engine management, or battery control into a single ECU
- Integrates Inverter, digital power, or complex engine/transmission control units
- Reduce cable weight, BOM cost, and system complexity
- Advanced synchronization for dual-axle EVs or Hybrid ICE-Electric transitions
- 10 integrated timer modules for instant, jitter-free signal control and superior real-time performance
- Synchronize >100 ADC ch and PWM signals to manage front/rear axles or hybrid torque-split in parallel.
Stellar P3E is a key addition to the Stellar P series
Stellar P3E is a key addition to the Stellar P series
The Stellar P3E is more than an evolution; it defines a new category of MCU by bridging the gap between mission-critical safety and embedded AI. It maintains seamless compatibility with the current Stellar portfolio while unlocking higher performance and smarter motor control.
Edge AI and tools to move faster
Stellar P3E is backed by the ST Edge AI suite - a comprehensive toolchain - connecting data scientists and embedded engineers in one flow:
Software & toolchain
- Fully supported in Stellar Studio, ST’s comprehensive automotive development environment.
- Automotive software solutions including AUTOSAR MCAL drivers
Get started today
Engineering samples of Stellar P3E are available now. Contact your local ST sales office to request samples and begin evaluating your design.
Full automotive qualification and production readiness are planned for H2 2026.