UJA1079ATW/3V3/WD,

Specialized Overview

The UJA1079ATW/3V3/WD is a LIN core System Basis Chip (SBC) from NXP Semiconductors designed for automotive Electronic Control Units (ECUs). It integrates a LIN transceiver compliant with LIN 2.2A and SAE J2602, a scalable 3.3 V voltage regulator delivering up to 250 mA, an advanced independent watchdog, and a full-duplex Serial Peripheral Interface (SPI). The device features two local wake-up input ports, a limp home output port, and enhanced electromagnetic compatibility (EMC) performance. It operates in a 32-lead HTSSOP32 package measuring 6.1 mm by 11 mm.

Specialized Feature Summary

• Integrates a LIN transceiver compliant with LIN 2.2A, LIN 2.2, LIN 2.1, LIN 2.0, and LIN 1.3 standards, featuring low slope mode for optimized EMC performance.
• Includes a scalable 3.3 V voltage regulator capable of delivering up to 250 mA, extendable via external PNP transistor for improved heat distribution.
• Features an advanced independent watchdog with Window and Timeout modes, programmable via SPI configuration registers.
• Provides robust protection including ±8 kV ESD protection on bus pins, ±58 V short-circuit proof capability, and ISO 7637-3 transient protection.

Specialized Applications

• Automotive electronic control units (ECUs) requiring LIN interface connectivity
• Power and sensor peripheral control networks using LIN as a local sub-bus
• Systems requiring safe and controlled microcontroller start-up behavior

Specialized Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the integrated voltage regulator level and watchdog presence. Ensure the component matches the required automotive qualification standards and RoHS compliance specifications before procurement.

Specialized Selection Notes

Select this variant when a 3.3 V supply is required for the microcontroller and peripherals. Confirm that the integrated watchdog functionality is necessary for the application safety requirements. Verify that the HTSSOP32 package dimensions fit the available PCB space constraints.

Specialized Part Context

This component belongs to the UJA1079A family of LIN core system basis chips. Variants within this family differ primarily in the output voltage of the main regulator (3.3 V or 5 V) and the inclusion of the watchdog timer, indicated by the 'W' suffix in the part number.

Specialized Replacement Considerations

Consult the official NXP replacement guide for verified substitute part numbers. Do not assume cross-compatibility with other LIN transceivers without verifying pinout and electrical parameter alignment.

Specialized FAQ

What LIN standards does the UJA1079ATW/3V3/WD support?

It supports LIN 2.2A, LIN 2.2, LIN 2.1, LIN 2.0, and is compatible with LIN 1.3, complying with SAE J2602.

How is the voltage regulator current capability extended?

The 250 mA regulator can be extended by connecting an external PNP transistor to improve current capability and distribute heat dissipation over the PCB.

What are the supported watchdog operating modes?

The integrated watchdog supports Window mode, Timeout mode, and Off mode, which can be configured via the SPI interface.