UJA1169LTKZ

Specialized Overview

The UJA1169LTKZ is a mini high-speed CAN companion System Basis Chip (SBC) from NXP Semiconductors, designed to operate alongside a primary SBC in automotive networks. It integrates an ISO 11898-2:201x compliant HS-CAN transceiver supporting active CAN FD up to 2 Mbit/s and a scalable 5 V 250 mA low-drop voltage regulator (V1). The device includes a watchdog timer with configurable periods from 8 ms to 4 s, SPI interface for control, and a dedicated LIMP output pin. Variants like the UJA1169LTK/F support partial networking with CAN FD-passive wake-up. It features autonomous bus biasing, true floating CAN connections when powered off, and robust protection against ESD, short circuits, and automotive transients.

Specialized Feature Summary

• Companion SBC architecture with dedicated VIO input to adapt to any microcontroller supply domain, preventing reverse supply currents in multi-SBC applications.
• Integrated HS-CAN transceiver with autonomous bus biasing and CAN FD-passive support for selective wake-up without generating bus errors during sleep.
• Scalable 5 V 250 mA regulator (V1) with thermal management via external PNP transistor and undervoltage detection thresholds configurable in non-volatile memory.
• Robust automotive-grade protection including ±8 kV HBM ESD on CAN pins, ±58 V short-circuit proofing, and compliance with ISO 7637-3 transients.

Specialized Applications

• Automotive networks requiring multiple CAN transceivers or additional power supply resources beyond a single SBC.
• Secondary SBC implementations where isolation from the main microcontroller's supply domain is critical.
• Applications needing independent watchdog functions or separate limp-home outputs for ASIL-related safety requirements.
• Systems utilizing both classic CAN and CAN FD communication where passive sleep modes are beneficial.

Specialized Procurement Notes

Verify the specific ordering suffix matches the required variant features, such as the presence of V2/VEXT supplies or partial networking support. Confirm package type HVSON20 compatibility with your PCB footprint. Ensure non-volatile memory configuration settings align with your application's power-on and limp-home behavior requirements before finalizing procurement.

Specialized Selection Notes

Select the UJA1169LTKZ variant based on the need for onboard CAN supply (V2) or protected off-board sensor supply (VEXT). Consider the requirement for CAN FD-passive partial networking if operating in mixed CAN/CAN FD environments. Evaluate thermal scaling needs to determine if an external PNP transistor is necessary for the V1 regulator. Verify that the 250 mA current capability of V1 meets the load requirements for the microcontroller and other connected components.

Specialized Part Context

The UJA1169LTKZ belongs to the UJA1169L product series, which serves as a companion chip to the standard UJA1169A family. While the UJA1169A acts as a primary SBC with integrated MCU supply, the UJA1169L is optimized for secondary roles, offering flexible I/O level shifting and additional power domains. This distinction allows system designers to scale CAN network complexity and power distribution efficiently within automotive electronic control units.

Specialized Replacement Considerations

Direct replacements include other UJA1169L variants such as UJA1169LTK, UJA1169LTK/X, or UJA1169LTK/X/F depending on the required supply configurations. Ensure the substitute part supports the same HVSON20 package and maintains compatibility with the existing SPI interface and watchdog timing parameters.