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CAN FD micro-controller

For safety-critical automotive functions

Renesas has release the RH850/P1L-C group of micro-controllers as low-end models in the RH850/P1x-C series. The MCUs are designed for use in chassis and safety systems, such as anti-lock brake and airbag systems.

The RH850/P1L-C group of micro-controllers (Photo: Renesas)

The RH850/P1L-C is a low-end MCU (micro-controller) group that is part of the RH850/P1x-C series of safety MCUs that meets the requirements for advanced driver assistance systems (ADAS). Driver assistance systems have increased in sophistication and performance as efforts have continued toward the realization of autonomous-driving vehicles, thereby coordinating control with other vehicle control units has become essential. With regard to chassis systems, the need for coordination with ADAS has brought an increase in the volume of information from sensors and, combined with communication functionality, created demand for more powerful information processing capabilities.

In addition, to prepare for new cyber security threats such as vehicle hacking, MCUs must conform to in-vehicle security specifications such as Evita and the ISO 26262 automotive functional safety standard Asil-D to avoid fatal situations caused by system malfunction due to breakdown, and so forth.

To address these needs from sensing, connectivity, security, and safety perspectives, Renesas launched the RH850/P1H-C and RH850/P1M-C groups of the RH850/P1x-C series in 2014 as one-stop safety MCUs. The RH850/P1H-C group is suitable for high-end applications such as ADAS, and the RH850/P1M-C is suitable for middle range applications such as stability control.

Along with the needs for these high-end/middle-range applications, there is also a need for system redundancy to enable operation to continue even when a failure occurs, and therefore for more compact ECUs. In particular, there is growing demand for common software and development tools to reduce the time and cost associated with the development of more sophisticated systems with advanced functions.

The RH850/P1L-C was developed to meet these demands of low-end applications such as chassis and safety systems including anti-lock brake systems, air bag systems and compact motor control systems, as well as the needs to address ECU miniaturization and system redundancy needs. With the launch, the company now provides a scalable product lineup of the RH850/P1x-C series that enables customers to develop platforms extending from high-end to low-end applications, by reusing software resources and making use of common development tools.

The RH850/P1L-C group inherits the RH850/P1x-C platform and includes many of the proven embedded safety mechanisms, such as a redundant checker core which operates in lockstep to the master core. These features enable the RH850/P1L-C devices to support Asil-D systems, the most stringent safety level stipulated in the ISO 26262 automotive functional safety standard, as a safety element out of context. It also incorporates the ICU-S Renesas hardware security module, which supports the SHE (Secure Hardware Extension) and Evita-Light (E-safety Vehicle Intrusion Protected Applications) automotive security standards. The RH850/P1L-C group additionally inherits timers and communication functions such as CAN FD from its high-end predecessors, for expanded scalability from the high end to the low end that simplifies the tasks of developing new products and extending existing product lines.

The 40 Nm process used for MCU production has a proven track record of achieving low power consumption and high reliability. This process enables the use of LQFP packages that require no heat sink when using a single power supply and operate at a frequency of 120 MHz (typically 50 mA, 5 V, 25 °C). These QFP packages use a 0,4 mm pin pitch, which results in a more compact ECU. For example, the package of the 144-pin version is 36 % smaller (compared with earlier products using a 0,5 mm pin pitch). Three pin-count packages are available: 80 (10 mm x 10 mm), 100 (12 m x 12 m), and 144 (16 mm x 16 mm) pins.


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