UJA1075TW/3V3/WD,1

Specialized Overview

The UJA1075TW/3V3/WD,1 is a high-speed CAN/LIN core System Basis Chip (SBC) from NXP Semiconductors. It integrates a high-speed CAN transceiver compliant with ISO 11898-2 and ISO 11898-5, and a LIN transceiver compliant with LIN 2.1, LIN 2.0, and SAE J2602. The device includes an advanced independent watchdog, two voltage regulators (a scalable 3.3 V main regulator delivering up to 250 mA and a separate 5 V regulator for the CAN transceiver), and a full-duplex Serial Peripheral Interface (SPI). It features two local wake-up input ports and a limp home output port.

Specialized Feature Summary

• Integrates high-speed CAN and LIN transceivers with dedicated low-dropout voltage regulators for improved EMC performance.
• Provides advanced power management with Standby, Normal, and Sleep modes, supporting wake-up via CAN, LIN, or local pins.
• Includes a programmable watchdog with Window and Timeout modes, controlled by an on-chip oscillator.
• Offers detailed system status reporting and diagnostic capabilities through a 16-bit SPI interface.

Specialized Applications

• Electronic Control Units (ECUs) in automotive applications
• Network applications controlling power and sensor peripherals
• Systems requiring integrated CAN/LIN communication and power management

Specialized Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact voltage regulator version and feature set. Ensure compatibility with the target microcontroller's SPI interface and voltage requirements before procurement.

Specialized Selection Notes

Select this component when a single-chip solution for CAN and LIN communication combined with power regulation is required. Consider the 3.3 V output of the main regulator and the availability of the watchdog feature. Evaluate thermal dissipation needs, as the HTSSOP32 package supports external PNP transistor expansion for higher current loads.

Specialized Part Context

The UJA1075 series replaces discrete components in ECUs. Variants include 5 V and 3.3 V versions for the main regulator, with or without the watchdog function. The TW designation indicates the HTSSOP32 package type.

Specialized Replacement Considerations

Check for direct substitutes within the UJA1075 family, such as UJA1075TW/5V0/WD,1, which shares the same package and features but provides a 5 V main regulator instead of 3.3 V.

Specialized FAQ

What standards does the LIN transceiver comply with?

The LIN transceiver is compliant with LIN 2.1, LIN 2.0, and SAE J2602, and is downward compatible with LIN 1.3.

How can the current capability of the main voltage regulator be increased?

An external PNP transistor can be connected to the UJA1075 to increase the current capability and improve heat distribution over the PCB.

What are the supported watchdog modes?

The UJA1075 supports Window mode, Timeout mode, and Off mode for its advanced independent watchdog.