High-Speed CAN Fail-Safe System Basis Chip

The UJA1066 fail-safe System Basis Chip (SBC) replaces basic discrete components which are common in every Electronic Control Unit (ECU) with a Controller Area Network (CAN) interface. The fail-safe SBC supports all networking applications that control various power and sensor peripherals by using high-speed CAN as the main network interface. The fail-safe SBC contains the following integrated devices:

• High-speed CAN transceiver, interoperable and downward compatible with CAN transceiver TJA1041 and TJA1041A, and compatible with the ISO 11898-2 standard and the ISO 11898-5 standard (in preparation)
• Advanced independent watchdog
• Dedicated voltage regulators for microcontroller and CAN transceiver
• Serial peripheral interface (full duplex)
• Local wake-up input port
• Inhibit/limp-home output port

In addition to the advantages of integrating these common ECU functions in a single package, the fail-safe SBC offers an intelligent combination of system-specific functions such as:

• Advanced low-power concept
• Safe and controlled system start-up behavior
• Advanced fail-safe system behavior that prevents any conceivable deadlock
• Detailed status reporting on system and subsystem levels

The UJA1066 is designed to be used in combination with a microcontroller that incorporates a CAN controller. The fail-safe SBC ensures that the microcontroller is always started up in a defined manner. In failure situations, the fail-safe SBC will maintain microcontroller functionality for as long as possible to provide a full monitoring and software-driven fallback operation.

The UJA1066 is designed for 14 V single power supply architectures and for 14 V and 42 V dual power supply architectures.