UJA1075ATW/3V3/WDJ

Specialized Overview

The UJA1075ATW/3V3/WDJ 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 supporting LIN 2.2A standards. The device includes an advanced independent watchdog, two voltage regulators (a scalable 3.3 V main regulator delivering up to 250 mA and a dedicated 5 V CAN regulator), and a full-duplex SPI interface. It features two local wake-up ports, a limp home output, and operates within a temperature range of -40 °C to +150 °C. The component is housed in a 32-lead HTSSOP package.

Specialized Feature Summary

• Integrates high-speed CAN and LIN transceivers with enhanced EMC performance and low slope mode for optimized electromagnetic compatibility.
• Features a scalable 3.3 V main voltage regulator capable of delivering up to 250 mA, extendable via external PNP transistor for improved thermal distribution.
• Includes an advanced independent watchdog with Window and Timeout modes, clocked by an on-chip oscillator for system safety.
• Provides detailed status reporting and control via a 16-bit full-duplex Serial Peripheral Interface (SPI).

Specialized Applications

• Electronic Control Units (ECU) requiring integrated power management and communication interfaces.
• Automotive networking applications controlling power and sensor peripherals using high-speed CAN as the main bus.
• Local sub-bus implementations utilizing the LIN interface for peripheral control.

Specialized Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm regulatory compliance and feature set. Confirm that the package type matches the required PCB footprint. Ensure the selected variant aligns with the necessary voltage regulator specifications and watchdog requirements for the target application design.

Specialized Selection Notes

Select this component when a single-chip solution for ECU power management and dual-network communication is required. Choose the 3.3 V version if the microcontroller supply voltage is 3.3 V. Consider the external PNP transistor option if higher current capability or better heat dissipation is needed beyond the internal 250 mA limit. Verify compatibility with the target microcontroller's SPI interface.

Specialized Part Context

The UJA1075A series replaces discrete components in ECUs by combining CAN and LIN interfaces with power regulation. It is designed to work with microcontrollers containing a CAN controller, ensuring controlled startup behavior. The SBC supports remote flash programming via the CAN bus and offers various operating modes including Standby, Sleep, and Normal to manage power consumption effectively.

Specialized Replacement Considerations

Check for variants with different voltage outputs (e.g., 5 V versions) or without the watchdog suffix if the application does not require those specific features. Ensure any substitute maintains the HTSSOP32 package dimensions and pinout compatibility.