General description

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

Features and benefits

General

■ Contains a full set of CAN ECU functions:

◆ CAN transceiver

◆ Voltage regulator for the microcontroller (3.3 V or 5.0 V)

◆ Separate voltage regulator for the CAN transceiver (5 V)

◆ Enhanced window watchdog with on-chip oscillator

◆ Serial Peripheral Interface (SPI) for the microcontroller

◆ ECU power management system

◆ Fully integrated autonomous fail-safe system

■ Designed for automotive applications:

◆ Supports 14 V and 42 V architectures

◆ Excellent ElectroMagnetic Compatibility (EMC) performance

◆ ±8 kV ElectroStatic Discharge (ESD) protection Human Body Model (HBM) for off-board pins

◆ ±4 kV ElectroStatic Discharge (ESD) protection IEC 61000-4-2 for off-board pins

◆ ±60 V short-circuit proof CAN-bus pins

◆ Battery and CAN-bus pins are protected against transients in accordance with ISO 7637-3

◆ Very low sleep current

■ Supports remote flash programming via the CAN-bus

■ Small 8 mm × 11 mm HTSSOP32 package with low thermal resistance

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