NXP UJA1075ATW/5V0WD: A Comprehensive Overview of the 5V CAN System Basis Chip with Sleep Mode

In the realm of automotive and industrial electronics, the demand for robust, integrated, and power-efficient communication solutions is paramount. The NXP UJA1075ATW/5V0WD stands as a pivotal component in this landscape, representing a highly integrated 5V System Basis Chip (SBC) designed specifically for Controller Area Network (CAN) applications. This device consolidates multiple critical functions into a single package, streamlining design, reducing board space, and enhancing overall system reliability.

At its core, the UJA1075 serves as a complete power and communication subsystem for microcontrollers (MCUs) in networked nodes. Its primary function is to provide the regulated 5V power supply for both the external microcontroller and itself from a vehicle's battery voltage, which can range from 5.5V to 27V and endure transient conditions up to 40V. This is achieved through a high-efficiency step-down (buck) DC/DC controller, which requires only a few external components to form a complete power supply circuit.

A defining feature of this SBC is its advanced CAN FD (Flexible Data-Rate) transceiver. This transceiver is fully compliant with the latest ISO 11898-2:2016 standard, supporting both classic CAN and the faster CAN FD protocol, which allows for higher data throughput in the data phase of a frame. It offers excellent electromagnetic compatibility (EMC) and electrostatic discharge (ESD) protection, ensuring reliable data transmission in the electrically harsh environments typical of automobiles.

Beyond power and communication, the chip integrates two low-dropout (LDO) linear voltage regulators. One provides a stable 5V supply for the MCU and other peripherals, while the other is a lower-voltage LDO, often used for sensor supply. This integration eliminates the need for multiple discrete regulators, further simplifying the system design.

Perhaps one of its most critical capabilities for power-sensitive applications is its sophisticated power management and low-power sleep mode. The UJA1075 can be commanded to enter a very low-current consumption state while still remaining responsive to network activity. It can wake up from this sleep mode either via a dedicated wake-up input pin or through a detected CAN bus wake-up event. This functionality is indispensable for modern automotive systems, enabling features like keyless entry and start-stop functionality without excessively draining the vehicle's battery.

The device also includes extensive fault detection and protection mechanisms. It continuously monitors its supply voltages, the temperature of the chip, and the state of the CAN bus. In the event of an under-voltage or over-temperature condition, the SBC can take pre-defined actions, such as resetting the microcontroller, to safeguard the entire electronic control unit (ECU).

Housed in a compact HTSSOP32 package, the UJA1075ATW/5V0WD is engineered for space-constrained applications and can operate over a wide ambient temperature range of -40°C to +125°C, making it suitable for under-the-hood automotive environments.

ICGOOFind: The NXP UJA1075ATW/5V0WD is an exemplary System Basis Chip that masterfully combines power supply, network communication, and system management into a single, robust unit. Its integrated 5V regulators, CAN FD transceiver, and ultra-low-power sleep mode with multiple wake-up sources make it an ideal, all-in-one solution for enhancing reliability and efficiency in next-generation automotive and industrial network nodes.

Keywords: System Basis Chip (SBC), CAN FD Transceiver, Low-Power Sleep Mode, Wake-up Event, Voltage Regulator.