UJA1076ATW/5V0WD,1

Specialized Overview

The UJA1076ATW/5V0WD,1 is a high-speed CAN core System Basis Chip (SBC) from NXP Semiconductors. It integrates a high-speed CAN transceiver compliant with ISO 11898-2 and ISO 11898-5 standards, an advanced independent watchdog, and two voltage regulators. The main regulator V1 provides a scalable 5 V output delivering up to 250 mA for microcontroller supply, while the separate regulator V2 supplies the on-board CAN transceiver. The device features a full-duplex Serial Peripheral Interface (SPI), two local wake-up input ports, and a limp home output port. It operates within a temperature range of -40 °C to 125 °C and is housed in a 32-lead HTSSOP package.

Specialized Feature Summary

• Integrates a high-speed CAN transceiver compatible with ISO 11898-2 and ISO 11898-5 standards alongside an advanced independent watchdog for system reliability.
• Features a scalable 5 V main voltage regulator capable of delivering up to 250 mA, which can be extended via an external PNP transistor for improved thermal distribution.
• Includes a dedicated low dropout voltage regulator for the CAN transceiver to ensure stable operation and enhanced electromagnetic compatibility performance.
• Provides comprehensive control and diagnostic capabilities through a full-duplex SPI interface, including programmable watchdog modes and detailed status reporting.

Specialized Applications

• Electronic Control Units (ECU) requiring integrated power management and communication interfaces
• Automotive networking applications utilizing high-speed CAN as the primary network interface
• Systems controlling power and sensor peripherals via CAN bus architecture

Specialized Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the presence of the watchdog feature and the exact voltage regulator configuration. Ensure that the component meets all relevant automotive qualification standards required for the intended application environment before finalizing procurement decisions.

Specialized Selection Notes

Select this component when a single-chip solution is required to replace discrete ECU components, combining CAN communication with power regulation. Consider the external PNP transistor option if higher current capability or better heat dissipation across the PCB is necessary for the specific microcontroller load requirements.

Specialized Part Context

This part belongs to the UJA1076A family of high-speed CAN core system basis chips designed by NXP Semiconductors. The family offers variations in voltage regulator outputs and watchdog inclusion, providing flexibility for different automotive electronic control unit designs while maintaining a consistent interface and functional block structure.

Specialized Replacement Considerations

The datasheet specifies that the integrated CAN transceiver is inter-operable and downward compatible with the TJA1042. Designers should verify pinout and register compatibility when substituting other CAN SBCs, as direct pin-for-pin replacements may require schematic adjustments.

Specialized FAQ

What are the supported modes for the integrated watchdog?

The integrated watchdog supports Window mode, Timeout mode, and Off mode. The default watchdog period is 128 ms, and it can be configured via the SPI interface.

How is the main voltage regulator current capability extended?

The main voltage regulator can deliver up to 250 mA. This capability can be increased by connecting an external PNP transistor to distribute heat dissipation over the PCB and handle higher loads.

What protection features are included for the CAN bus pins?

The CAN bus pins are short-circuit proof up to ±58 V and protected against transients in accordance with ISO 7637-3. They also feature ±8 kV ESD protection (Human Body Model) and ±6 kV IEC 61000-4-2 protection.