MC33908 Safe System Basis Chip Evaluation Kit

The MC33908 System Basis Chip (SBC), a Freescale Energy-Efficient solution, provides power to MCUs and other system loads and optimizes energy consumption through DC/DC switching regulators, linear regulators and ultra-low-power saving modes. The device contains advanced functional safety measures, a serial peripheral interface (SPI) to allow control and diagnostics with the MCU. It also integrates CAN and LIN physical interfaces compliant with the ISO 11898-2,-5, LIN 2.2, 2.1/J2602-2 standards along with the latest automotive OEM standards for EMC and ESD. The MC33908 device, a SafeAssure functional safety solution reduces the time required to develop safety systems that comply with the International Standards Organization (ISO) 26262. The device includes a range of integrated safety features such as monitoring of critical analog parameters, a failsafe state machine and an advanced watchdog. These features simplify system designs and reduce software complexity when combined with dual-core lock-step MCUs.

Energy Management Unit

• Flexible DC/DC pre-regulator allowing Buck or Buck-Boost
• Optional Boost to improve system availability at cranking
• Multiple output power supplies from 0.5 up to 2 A
• DC/DC voltage regulator to supply MCU core up to 1.5 A
• 5 V/ 3.3 V linear voltage regulator dedicated to MCU I/Os
• Linear voltage regulator dedicated to auxiliary loads
• Multiple wake-up sources combined with ultra-low-power mode: CAN, LIN, I/Os, current detection....
• Battery sensing before and after reverse battery protection
• Analog multiplxer to sense critical signals

Functional Safety Measures

• Enhanced safety block associated with fail-safe outputs
• Designed for ASIL D applications (FMEDA, Safety manual)
• Secured SPI interface
• Configurable I/Os for wake-up and safety purposes

Robust Physical Layers

• ISO11898-2,-5 CAN high-speed physical interface
• LIN 2.2/2.1, J2602-2 physical interface
• High EMC immunity and ESD robustness