MCU support chips help Freescale processors to System-Level Functional Safety

April 03, 2014 // By Graham Prophet
Optimised for 32-bit MCUs, Freescale’s next-generation aanlogue system basis chips deliver energy-efficient scalability

Automotive and industrial system designers can reduce the cost and complexity of designing applications required to meet functional safety standards, according to Freescale, with the introduction of system basis chips (SBCs) that provide support for stringent system-level functional safety integrated with a high efficiency DC/DC switching regulator for reducing overall energy consumption.

Developed in accordance with key functional safety requirements, MC33907 and MC33908 SBCs work with 32-bit MCUs such as Freescale's Qorivva series devices to provide a scalable power supply solution that combines power management and communications with integrated functional safety for a broad range of power segmentation architectures. For systems designers, the result is an easy-to-use software/hardware solution that supports the specific functional safety requirements of multiple applications while simplifying designs, minimising use of external components and reducing bill-of-materials costs.

With a dual DC/DC switching regulator architecture and low-voltage operation down to 2.7V supply, the MC33907 and MC33908 products supply power to microcontrollers and other system loads while maintaining system operation during power brown-out events such as during an automotive cranking pulse. Ultra-low power modes and wake up capabilities reduce system quiescent current down to 30 µA, limiting system standby energy consumption and battery discharge. The devices’ configurable voltage regulator capabilities enable design of scalable platforms optimised for 32-bit MCUs supporting functional safety certifications across multiple vehicles or industrial applications.

According to James Bates, general manager and senior vice president of Freescale’s Analog and Sensors Group. “...these new system basis chips are designed to meet ISO 26262 ASIL D - the most stringent functional safety requirement, as well as the latest automotive OEM requirements for ESD and electromagnetic compatibility.”

The functional safety of the MC33907 and MC33908 products has been validated by a third-party certification organisation, which found their safety architecture and approach to surpass ISO 26262 ASIL-D for safety applications. Both system basis chips are part of the Freescale SafeAssure program, which offers a broad solution set of