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CAN micro-controller and system-basis-chips support functional safety

The automotive industry goes functional safety. Freescale (USA) supports this by its Safe-assure solutions program. It highlights solutions – hardware and software – that are designed to support functional safety implementations compliant to ISO 26262 and IEC 65108. Recently, the chipmaker the Qorivva MPC574 micro-controller family featuring three CAN interfaces and the MC33906 series of system-basis-chips (SBC) comprising CAN transceivers.

THE 32-BIT MICRO-CONTROLLER AND SBC MC33906/7/8 help automotive systems meet all Automotive Safety Integrity Levels (ASIL) up to and including the most stringent one, ASIL D. Both chip families are designed from the ground up in a way that system manufacturers can more easily achieve system compliance with functional safety. The Safe-assure program includes MCUs, sensors and analog ICs, as well as support including training, safety documentation and technical support for functional safety application design.
“Our system-level approach helps developers reduce the complexity of achieving compliance with safety standards while building advanced safety performance into their systems,” said Gavin Woods from Freescale. “Our new generation of SBCs along with the latest Qorivva MCU are backed by the Safe-assure program and enable our customers to meet their system-level functional safety goals.”
The Qorivva MPC574 micro-controllers provide the performance and features needed to address functional safety requirements up to the ASIL D level according to ISO 26262. Operating up to 180 MHz, the MCU is built on a 55-nm process with an integrated safety architecture, dual-core delayed lock step and additional on-chip redundancy. It can operate in extreme operating environments, such as electric power steering systems, that require a junction temperature of up to 165 °C.
By integrating many features into one safety platform, the MCU offers approximately twice the memory, performance and motor control capabilities of previous products from the chipmaker. Pin-compatibility means existing MCU customers can upgrade with only minor hardware and software changes.
The SBC provide power to MCUs and other system loads and optimize energy consumption through low-power saving modes. The chip also contain CAN and LIN physical layers compliant with the ISO 11898-2/5 and LIN 2.1/J2602-2 standards, safety measures and a serial peripheral interface to allow control and diagnostic with the MCU.
The pin-compatible MC33906/7/8 family is the SBC solutions that includes DC/DC switching regulators to optimize energy efficiency. An optional boost mode keeps the system available during engine cranking pulses. In addition, low-power modes reduce current consumption and optimize wake-up times. As with previous generations, the introduced SBCs are designed to meet the latest automotive OEM requirements for electromagnetic compatibility.
The MC33906/7/8 chips are the first Freescale analog solutions developed to satisfy ASIL D requirements. They include a range of integrated safety measures such as monitoring of critical analog parameters, a failsafe state machine and an advanced watchdog. These features reduce software complexity when combined with dual-core lock-step MCUs.

Development support

Support includes the MPC574xP AUTOSAR safety MCAL and functional safety support documentation for these components, including a safety manual, safety application guide and an analysis of failure modes, effects and diagnostics. In addition, the chipmaker works with third-party partners, who provide real-time operating systems, tool chains as well as training and certification support. Both products, MCU and SBC will available in the third quarter of 2012.

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