company blog about Supply Renesas RH850 Automotive MCUs:RH850/F1KM-S1,RH850/F1KM-S2,RH850/F1KM-S4

Supply Renesas RH850 Automotive MCUs:RH850/F1KM-S1,RH850/F1KM-S2,RH850/F1KM-S4

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RH850/F1KM Series Automotive MCU Product Overview

RH850 is a family of high-performance 32-bit MCUs launched by Renesas Electronics for the automotive electronics market. Designed based on the proprietary RH850 core and compliant with the ISO 26262 ASIL-D functional safety standard, the RH850 is widely used in the fields of body control, new energy management, autonomous driving, and smart cockpit. As the high-performance series in the RH850 family, F1KM is designed to meet the needs of modern automotive electronics for high computing power, large memory and rich interfaces.

The RH850/F1KM series consists of three main models: RH850/F1KM-S1, RH850/F1KM-S2, and RH850/F1KM-S4, forming a complete product line from entry to high-end to meet the needs of different application scenarios. Adopting the G3KH CPU core, the MCUs feature low power consumption, high computational processing power and a variety of internal peripheral functions, and offer extensive power reduction measures to minimise supply current, making them particularly suitable for automotive electronics applications.

Detailed technical data and feature comparison by model

RH850/F1KM-S1: Economical Body Control Solution

The RH850/F1KM-S1 is the entry-level model of the F1KM series, designed for economical body electronics applications. With a 32-bit single-chip architecture, operating frequency up to 120MHz, internal flash memory ranging from 512KB to 1MB, and package options covering 48 to 100 pins, this model is suitable for space-constrained application scenarios.

Key Features:

Processor core: single G3KH CPU core at 120MHz

Storage Configuration: 512KB-1MB flash memory to meet basic programme storage requirements

Communication interface: integrated CAN FD interface, supporting high-speed in-vehicle communications

Low-power design: Low Power Sampler (LPS) and DeepSTOP modes to significantly reduce quiescent current.

Package Options: 48-100 pin packages for compact designs26

The F1KM-S1 is targeted at basic body electronics applications such as body control modules (BCMs), automotive gateways, air conditioning control systems (HVAC) and lighting modules. Its balanced performance and cost make it an ideal choice for electronic systems in budget models.

RH850/F1KM-S2: Flexible choice for mid-range performance

As the mid-range model of the F1KM series, the RH850/F1KM-S2 achieves significant improvements in performance and functionality, filling the gap in the market between the F1KM-S1 and F1KM-S4. With an increased operating frequency of 240MHz, an increase in internal Flash memory to 2MB, and packages covering 100 to 176 pins, this model offers developers greater design flexibility.

Key Upgrades:

Performance enhancement: CPU frequency doubled to 240MHz, significantly increasing computing power

Memory Expansion: 2MB Flash capacity to support more complex applications

Package Expansion: 100-176 pin package for more I/O resources

Security Enhancement: Support for Evita-Mid security standard to meet the growing demand for in-vehicle security.

The F1KM-S2 is especially suited for applications that require higher performance than the S1, but do not require the top-of-the-line configuration of the S4. Renesas' official case study shows that when the security requirements of a project under development are enhanced and Evita-Mid support is needed but the 1MB ROM space is exhausted, upgrading to the F1KM-S2 can satisfy the requirements with minimal hardware and software changes. Additionally, for projects that were originally planned to use F1KM-S4 but only required 2MB of flash memory, switching to F1KM-S2 can significantly reduce costs without sacrificing critical performance.

RH850/F1KM-S4: Flagship Model for High-End Automotive Electronics

The RH850/F1KM-S4 represents the top-of-the-line performance of the F1KM series, designed for the most demanding automotive electronics applications. This model expands on the S2 with 3MB to 4MB of internal flash memory, package options covering 100 to 272 pins, and added Ethernet interface support.

Flagship features:

Ultra-large storage: 3-4MB flash capacity to support complex algorithms and large-scale programmes

High-speed interfaces: In addition to CAN FD, Ethernet support has been added for domain controller applications.

Extended package: Maximum 272-pin package, providing rich peripheral interface resources.

High-performance computing: Maintains high 240MHz main frequency to ensure real-time response capability.

F1KM-S4 is mainly targeted at high-end body control, domain controller and pre-ADAS system application scenarios. Its large memory feature is particularly suitable for applications requiring OTA (Over-the-Air Upgrade) functionality, supporting a 2MB+2MB OTA programme partition design.7 For centralised electronic architectures that need to process complex algorithms or integrate multiple functions, the F1KM-S4 provides the necessary computing resources and interface flexibility.