Safety microcontrollers prepare for autonomous driving

Four RH850/P1L-C microcontrollers are designed for use in chassis and safety systems, such as anti-lock brake and airbag systems, as well as compact motor control systems. The RH850/P1L-C group is part of the RH850/P1x-C Series of safety MCUs that meets the requirements for advanced driver assistance systems (ADAS) in one stop, says Renesas.

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.

The company already offers the high end RH850/P1H-C Group for applications such as ADAS, and the RH850/P1M-C, for middle range applications such as stability control.

For low-end applications, such as chassis and safety systems including anti-lock brake systems, air bag systems and compact motor control systems, the RH850/P1L-C Group also address ECU miniaturisation and system redundancy needs. There is also 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 addition creates a scalable product line-up 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 includes many of the proven embedded safety mechanisms, such as a redundant checker core which operates in lockstep to the master core. It also incorporates the ICU-S Renesas hardware security module, which supports the SHE and EVITA-Light automotive security standards. Timers and communication functions such as CAN-FD are inherited from other safety microcontrollers in the wider group.

The 40nm process enables the use of LQFPs that do not require a heat sink when using a single power supply. The devices also operate at a frequency of 120MHz (typical 50mA, 5.0V, 25degreeC). The QFP packages use a 0.4 mm pin pitch, which results in a more compact ECU, says the company. For example, the package of the 144-pin version is 36 per cent smaller (compared with earlier products using a 0.5mm pin pitch). Three pin-count packages are also available: 80 (10 x 10mm), 100 (12 x 12m), and 144 (16 x 16mm) pins.

Safety and security support programs, virtual environments employ model-based development tools provided in collaboration with Renesas partners, MCAL with AutoSAR support. There are also reference boards designed for compact motor control systems.

Samples of the RH850/P1L-C Group are available now. Mass production is scheduled to begin in May 2018.


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