UJA1065TW/3V3,518

Specialized Overview

The UJA1065TW/3V3,518 is a high-speed CAN/LIN fail-safe System Basis Chip (SBC) manufactured by NXP Semiconductors. It integrates a high-speed CAN transceiver compliant with ISO 11898-2 and ISO 11898-5 standards, alongside a LIN transceiver compliant with LIN 2.0 and SAE J2602. The device includes dedicated voltage regulators for the microcontroller (3.3 V version) and the CAN transceiver (5 V), an advanced independent watchdog with an on-chip oscillator, and a full-duplex Serial Peripheral Interface (SPI). Designed for automotive Electronic Control Units (ECUs), it supports 14 V and 42 V power architectures, offering integrated power management, local wake-up inputs, and inhibit/limp-home outputs within a 32-lead HTSSOP package.

Specialized Feature Summary

• Integrates high-speed CAN and LIN transceivers with enhanced error signaling and reporting capabilities.
• Features a fully autonomous fail-safe system controller with programmable window and time-out watchdog modes.
• Provides dedicated voltage regulators for both the microcontroller and the CAN transceiver to ensure stable operation.
• Supports advanced low-power concepts including Standby and Sleep modes with cyclic wake-up capabilities.

Specialized Applications

• Automotive Electronic Control Units (ECUs) requiring integrated networking and power management.
• Systems utilizing high-speed CAN as the main network interface and LIN as a local sub-bus.
• Applications demanding robust fail-safe behavior and detailed status reporting on system levels.

Specialized Procurement Notes

Verify the specific ordering suffix against the manufacturer's current product data sheet to confirm the voltage regulator output level. Ensure the component meets the required automotive qualification standards for your application environment. Cross-reference the pin configuration and package dimensions with the official datasheet before finalizing PCB layout designs.

Specialized Selection Notes

Select the UJA1065TW/3V3 variant when the microcontroller supply requires a 3.3 V output from the integrated regulator. Choose this model over the 5 V version if system power architecture dictates lower voltage regulation for the MCU core. Confirm compatibility with existing CAN and LIN bus protocols and ensure the HTSSOP32 package fits the thermal and spatial constraints of the design.

Specialized Part Context

The UJA1065 series serves as a comprehensive solution for replacing discrete components in automotive ECUs. It consolidates essential functions such as communication interfaces, power regulation, and system supervision into a single chip. This integration reduces board space, lowers component count, and enhances overall system reliability through unified fail-safe mechanisms and optimized power management strategies.

Specialized Replacement Considerations

The UJA1065TW/3V3 is functionally compatible with the TJA1041 and TJA1041A CAN transceivers. When substituting discrete components, verify that the replacement maintains the required ISO 11898-2 compliance and supports the necessary LIN 2.0 specifications for the target application.

Specialized FAQ

What is the purpose of the Fail-safe mode in the UJA1065?

Fail-safe mode is entered during severe fault situations or failed start-ups to provide the lowest possible system power consumption. It prevents deadlock and allows the system to maintain microcontroller functionality for monitoring and software-driven fall-back operations until a valid wake-up event occurs.

How does the watchdog timer operate in Normal mode?

In Normal mode, the watchdog operates in Window mode, which detects both too early and too late accesses by the microcontroller. This ensures strict software supervision, triggering a system reset if the watchdog is not properly served within the defined trigger window.

Can the UJA1065 support remote flash programming?

Yes, the device supports remote flash programming via the CAN-bus. This feature allows for software updates and diagnostics without physical access to the ECU, facilitated by a secure Flash mode entry sequence controlled via the SPI interface.