UJA1061TW/3V3/C/T/

Specialized Overview

The UJA1061TW/3V3/C/T/ is a fail-safe System Basis Chip (SBC) integrating fault-tolerant CAN and LIN transceivers with power management for automotive ECUs. It provides a dedicated 3.3 V regulator for the microcontroller and a separate 5 V regulator for the CAN transceiver. The device supports 14 V, 24 V, and 42 V architectures, featuring an advanced watchdog with window and time-out modes, an on-chip oscillator, and SPI control. It includes local wake-up inputs, inhibit/limp-home outputs, and comprehensive fail-safe monitoring to ensure system integrity.

Specialized Feature Summary

• Integrates ISO 11898-3 compliant fault-tolerant CAN transceiver and LIN 2.0 transceiver within a single package.
• Provides intelligent power management with independent voltage regulators for the microcontroller and CAN bus.
• Ensures system safety through a programmable fail-safe coded window and time-out watchdog with on-chip oscillator.
• Supports multiple operating modes including Normal, Standby, Sleep, and Fail-safe with detailed status reporting via SPI.

Specialized Applications

• Automotive Electronic Control Units (ECUs) requiring robust CAN/LIN networking.
• Fault-tolerant network applications utilizing LIN as a local sub-bus.
• Systems designed for 14 V, 24 V, or 42 V single and dual power supply architectures.
• Applications demanding low sleep current and advanced fail-safe behavior to prevent deadlocks.

Specialized Procurement Notes

Verify component authenticity by checking the marking code against official NXP documentation. Confirm the ordering suffix matches the required voltage regulator version. Ensure the HTSSOP32 package type aligns with PCB footprint requirements. Validate RoHS compliance status prior to integration into production designs.

Specialized Selection Notes

Select the UJA1061TW/3V3 variant specifically when the host microcontroller requires a 3.3 V supply rail. Choose this model over the 5 V version if the application architecture mandates lower voltage regulation for the MCU core. Ensure the design accommodates the exposed die pad for thermal dissipation in the HTSSOP32 package.

Specialized Part Context

This component belongs to the UJA1061 family of fail-safe system basis chips from NXP Semiconductors. It is designed to replace discrete components in automotive ECUs, combining communication interfaces with power management. The TW/3V3/C/T/ designation indicates the specific voltage regulator output and packaging configuration within this product line.

Specialized Replacement Considerations

Direct replacements must match the HTSSOP32 package and pinout. Verify that substitute SBCs support both fault-tolerant CAN and LIN interfaces. Ensure equivalent fail-safe features and voltage regulator specifications are present in alternative components.

Specialized FAQ

What is the function of the SYSINH pin?

The SYSINH pin serves as a system inhibit output related to BAT42, typically used for controlling external DC-to-DC converters.

How does the device handle oscillator failure?

If the on-chip oscillator frequency is too low or stops running, the SBC immediately transitions to Fail-safe mode to ensure system safety.

Can the UJA1061 support remote flash programming?

Yes, the device supports remote flash programming via the CAN-bus using a specific fail-safe control sequence involving Mode register writes.