UJA1075TW/5V0/WD:1

Specialized Overview

The UJA1075TW/5V0/WD:1 is a high-speed CAN/LIN core System Basis Chip (SBC) designed for automotive Electronic Control Units (ECUs). 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. The device features a scalable 5 V main voltage regulator (V1) delivering up to 250 mA for microcontroller supply, extendable via an external PNP transistor. A separate 5 V voltage regulator (V2) powers the on-board CAN transceiver. An advanced independent watchdog with Window and Timeout modes is included. Communication with the host microcontroller occurs via a full-duplex Serial Peripheral Interface (SPI). The component operates within a battery supply range of 4.5 V to 28 V and is housed in a 32-lead HTSSOP package.

Specialized Feature Summary

• Integrates high-speed CAN and LIN transceivers with dedicated low-dropout regulators for improved EMC performance.
• Provides scalable 5 V power management with undervoltage protection and current threshold control for external transistor expansion.
• Includes an advanced independent watchdog with programmable timing and multiple operational modes for system safety.
• Features flexible wake-up mechanisms via CAN, LIN, or local input pins with selectable sampling times.

Specialized Applications

• Automotive Electronic Control Unit (ECU) power management
• High-speed Controller Area Network (CAN) node implementation
• Local Interconnect Network (LIN) sub-bus integration

Specialized Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm regulatory compliance and feature set. Confirm that the package type matches the required thermal and physical constraints for the target application design.

Specialized Selection Notes

Select this variant when a 5 V output is required for the microcontroller supply. Ensure the application utilizes the integrated watchdog functionality by verifying the WD suffix requirement. Compare against 3.3 V variants if lower voltage regulation is preferred for the host processor.

Specialized Part Context

This component belongs to the NXP UJA1075 family of System Basis Chips. Variants within the family differ primarily in the output voltage of the main regulator (3.3 V vs. 5 V) and the inclusion of the watchdog timer. The TW designation indicates the specific HTSSOP32 package configuration.

Specialized Replacement Considerations

Direct substitutes include other UJA1075 family members such as the UJA1075TW/3V3/WD:1 for 3.3 V applications. Verify pin compatibility and register mapping before replacing components with different voltage outputs or without the watchdog feature.

Specialized FAQ

How does the UJA1075 handle bus communication during sleep mode?

In Sleep mode, the CAN and LIN transceivers are switched off or enter a low-power state with bus wake-up detection active. The device remains capable of detecting wake-up events from the bus to transition back to Standby mode.

What is the function of the LIMP pin?

The LIMP pin serves as a limp home output. It is driven LOW to activate application-specific hardware in the event of a serious system malfunction or overtemperature condition.

Can the main voltage regulator current be extended?

Yes, the 250 mA main voltage regulator can be extended using an external PNP transistor. This allows for increased current capability and better heat distribution across the printed circuit board.