The brain of the car is radically transforming in the fast changing automotive technology. The days when a vehicle was operated by dozens of independent, isolated microchips are gone. The industry is currently on a path to Software-Defined Vehicle (SDV) a place in which features of the car, including autonomous driving, and the digital cockpit itself, are controlled by a centralized, high-performance computing core.
Renesas Electronics is at the head of this pack. The semiconductor giant unveiled a host of new breakthrough technologies that will drive this new age at the International Solid-State Circuits Conference (ISSCC 2026) in San Francisco in February. Renesas is doing more than making cars smarter; they are making them safer and more efficient with a concentration on 3nm process, the chiplet architecture and the revolutionary embedded memory.
R-Car X5H: 3nm Powerhouse of Centralized Compute
The flagship of their fifth-generation (Gen 5) R-Car is the R-Car X5H, which is the star of the Renesas roadmap. It is the industry leader in automotive multi-domain System-on-Chip (SoC) built on a modern 3nm technology.
Renesas has made a huge leap in efficiency by reducing the size of the circuitry to the 3nm scale:
- Reduced Power Usage: The X5H uses a maximum of 35 percent less power than the old 5nm designs.
- Massive AI Performance: It provides an unbelievable 400 TOPS (Tera Operations Per Second) of AI.
- Multi-Domain Mastery: This is the first chip to be capable of running ADAS (Advanced Driver Assistance Systems), In-Vehicle Infotainment (IVI) and high-speed gateway services.
Solving Traffic Jam using Chiplet Technology
The increased capability of automotive chips is also accompanied by an increase in size, which may cause faulty manufacturing and excessive costs. Renesas is addressing this through adoption of chiplet technology. They are no longer using one big, monolithic chip, but smaller chiplets which are interconnected on a high speed interface.
Functional safety is problematic with chiplets in cars. When a chiplet that processes your music crashes, it can by no means interfere with the chiplet that controls your brakes. This has been resolved by a proprietary RegionID mechanism at Renesas.
At ISSCC, a Renesas engineer said, We have added the standard UCIe die-to-die interface to our own RegionID logic. This guarantees the Freedom from Interference (FFI). Although it may have several apps running in several chiplets, the hardware resources remain completely isolated.
This connector facilitates the enormous 51.2 GB/s transfer rate, meaning that information passes through chiplets as quick as it passed throughout a conventional single chip.
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The emergence of eMRAM: Memory That Never Forgets
The car is being reinvented in terms of its memory on top of raw processing power. The conventional Flash storage cannot be easily reduced to the size of the modern AI chips (22nm and 3nm). Renesas is on the move to embedded MRAM (Magnetoresistive Random Access Memory).
MRAM is a universal memory that is the best of all worlds:
- Non-Volatile: It stores its data even when the power is switched off (such as Flash).
- Lightning Fast: It has read/write speeds equal to those of RAM.
- Radiation Resistant: MRAM is also radiation and magnetic interference resistant unlike conventional memory that can be damaged by the extreme conditions of the automotive setting.
Renesas can enable cars to wake up instantly through 1MB of high-speed eMRAM built in directly into their latest microcontrollers (such as the RA8 series). You do not even have to wait until the code is loaded off some other storage chip, the car is already ready to drive as soon as you hold the handle.
The Age of AI Zero-Defect Quality
The number of Neural Processing Units (NPUs) in the chip has increased by 1.5 times as AI models (such as Large Language Models in automotive assistants) grow in size. This becomes a nightmare in terms of time; a signal will take longer time to cross a larger chip resulting in latency.
Renesas responded by developing a hierarchical clock architecture. They have subdivided the main “Clock Pulse Generator” into dozens of mini-CPGs (mCPGs) throughout the chip.
