Vehicles today are using more electronics to cope with the diversifying requirements of drivers and passengers and to address concerns about the environment and fuel consumption. Multiple electronic control units (ECU) are connected by multiple in-vehicle LANs differing in transmission speed and communication protocol according to the features and characteristics required for each application, exchanging information and coordinating control to allow more added value functions to be implemented. Renesas has comprehensive know-how and a successful track record in all applications, from control systems to information systems, and meets the needs of our customers with our wide-ranging product lineup.

Block Diagram

Automotive Networking

CAN (Controller Area Network)

The CAN protocol is the current de facto standard for vehicle LANs. It is used for backbone network as well as the powertrain, chassis, and body systems. Renesas CAN MCUs have unique CAN functions, with a variety of packages, low power consumption, operation at high temperature and excellent EMI/EMS performance. The wide lineup optimizes diverse user systems.

Ethernet Diagnostic

Ethernet Diagnostics for Ethernet Electronic Connection Control Unit


Ethernet is prominent as a diagnostic protocol for engine, chassis, and body electronic connection control units used for network connections.

Brake by wire system

Ethernet Diagnostics for Ethernet Electronic Connection Control Unit


FlexRay is a high-speed communication protocol that provides a high degree of flexibility and reliability. It is the basis for active technology development in Japan and worldwide, and its many applications include next-generation X-by-Wire systems and backbone systems. Renesas offers V850 and SH-4A microcontrollers supporting FlexRay, and dedicated motor driver ICs, power MOSFETs, and so on. We are also investigating development of a bus driver IC for FlexRay communication.

Collision Detection System

Brake-by-Wire System

LIN (Local Interconnect Network)

LIN is a vehicle LAN protocol that uses a single master to achieve a superior cost-performance ratio. It is used in switch input and sensor input actuator control. Renesas offers optimal LIN MCUs for diverse body control with a variety of packages, low power consumption, operation at high temperatures and excellent EMI/EMS performance.

Keyless entry system

Multifunction Keyless System

Other protocols

Media Oriented Systems Transport (MOST)

MOST is a bus standard for vehicle multimedia networks designed to enable transfer of high-quality audio, video, and data. Its specifications are established by the MOST Cooperation, to which the major carmakers and manufacturers of automotive electrical system components belong. MOST allows easy interconnection of vehicle multimedia components.

Ethernet AVB (Audio Video Bridging)

Ethernet AVB is a real-time Ethernet stand-ard for audio and video. The IEEE has finalized the AVB1.0 standard, and the AVnu Alliance is in the process of formulating conform-ance specifications. AVB1.0 is expected to be adopted in the vehicle multimedia and camera fields, and vehicle control require-ments should be satisfied by AVB2.0.

Ethernet TSN (Time-Sensitive Networking)

Ethernet TSN is an extension of the Ethernet AVB standards that are currently used in professional audio equipment and in-vehicle networks. It is standardized by the TSN task group of IEEE 802.1. Ethernet TSN covers several features, including time synchronization as well as traffic scheduling, frame preemption and ingress policing, and is a high-speed network technology sufficient for supporting autonomous driving applications. Building on its expertise in in-vehicle communication technology, Renesas has become the world's first to demonstrate standard compliance for frame preemption as first in the industry. Renesas is also eyeing the possible replacement of the existing Ethernet with the TSN for automotive control systems, and intends to promote TSN standard in automotive networks to contribute to the realization of more suitable and safer autonomous-driving vehicles.

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