General description

The UJA1076 core System Basis Chip (SBC) replaces the basic discrete components commonly found in Electronic Control Units (ECU) with a high-speed Controller Area Network (CAN).

The UJA1076 supports the networking applications used to control power and sensor peripherals by using a high-speed CAN as the main network interface.

The core SBC contains the following integrated devices:

• High-speed CAN transceiver, inter-operable and downward compatible with CAN transceiver TJA1042, and compatible with the ISO 11898-2 and ISO 11898-5 standards

• Advanced independent watchdog (UJA1076/xx/WD versions)

• 250 mA voltage regulator for supplying a microcontroller; extendable with external PNP transistor for increased current capability and dissipation distribution

• Separate voltage regulator for supplying the on-board CAN transceiver

• Serial Peripheral Interface (SPI) (full duplex)

• 2 local wake-up input ports

• Limp-home output port

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

• Advanced low-power concept

• Safe and controlled system start-up behavior

• Detailed status reporting on system and sub-system levels

Features and benefits

General

■ Contains a full set of CAN ECU functions:

◆ CAN transceiver

◆ Scalable 3.3 V or 5 V voltage regulator delivering up to 250 mA for a microcontroller and peripheral circuitry; an external PNP transistor can be connected for better heat distribution over the PCB

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

◆ Watchdog with Window and Timeout modes and on-chip oscillator

◆ Serial Peripheral Interface (SPI) for communicating with the microcontroller

◆ ECU power management system

■ Designed for automotive applications:

◆ Excellent ElectroMagnetic Compatibility (EMC) performance

◆ ±8 kV ElectroStatic Discharge (ESD) protection Human Body Model (HBM) on the CAN bus pins and the wake pins

◆ ±6 kV ElectroStatic Discharge (ESD) protection IEC 61000-4-2 on the CAN bus pins and the wake pins

◆ ±58 V short-circuit proof CAN bus pins

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

■ Supports remote flash programming via the CAN bus

■ Small 6.1 mm × 11 mm HTSSOP32 package with low thermal resistance

■ Pb-free; RoHS and dark green compliant

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