NXP Semiconductors UJA1076ATW/5V0,112

Overview

UJA1076ATW/5V0,112 from NXP Semiconductors is a high-speed CAN core System Basis Chip (SBC) integrating a 5 V/250 mA microcontroller regulator, ISO 11898-2/5-compliant CAN transceiver, SPI interface, dual local wake-up inputs, and limp home output - designed for automotive ECU power and communication management in engine control, body electronics, and ADAS sensor nodes.

For engineers reviewing the UJA1076ATW/5V0,112 datasheet, UJA1076ATW/5V0,112 pinout, UJA1076ATW/5V0,112 application, or UJA1076ATW/5V0,112 equivalent, this SBC delivers verified CAN bus fault tolerance (±58 V short-circuit proof), programmable watchdog with window/timeout modes, dual-regulator supervision (V1/V2 undervoltage reporting), and remote flash programming support via CAN - critical for functional safety–aligned automotive designs.

Technical Context

The UJA1076ATW/5V0,112 implements a dedicated system controller state machine managing Off/Standby/Normal/Sleep/Overtemp mode transitions triggered by VBAT thresholds, wake events, or register-controlled MC bits. Its CAN transceiver features floating bus pins in Off mode and SPLIT output for recessive-level stabilization - directly supporting ISO 7637-3 transient immunity and EMC robustness.

Power management includes independent V1 (5 V, ±2 % accuracy, 250 mA) and V2 (5 V, CAN-only) regulators with configurable undervoltage reset thresholds (90 % or 70 % of nominal), external PNP biasing (VEXCTRL/VEXCC), and WBIAS-controlled wake-up sampling (16 ms or 64 ms). The 16-bit SPI interface enables full-duplex register access for real-time status reporting and configuration.

Key Specifications

Pinout & Package

UJA1076ATW/5V0,112 uses the HTSSOP32 (SOT549-1) package: thermally enhanced thin shrink small outline with 32 leads, 6.1 mm body width, 0.65 mm lead pitch, and exposed center pad soldered to PCB ground for improved thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CAN SBC applications.

Compared with TJA1043TK/0Z and UJA1075ATW/5V0,112, the UJA1076ATW/5V0,112 uniquely integrates full ECU power management, CAN transceiver, and safety features in one package - reducing design complexity and validation effort for automotive control units.

Availability

UJA1076ATW/5V0,112 is available at Aetrix Electronics and suitable for automotive engine control, body electronics, ADAS sensor nodes, electric power steering, and battery management systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for UJA1076ATW/5V0,112 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications - with deep expertise in automotive-grade mixed-signal ICs and functional safety certification.

The UJA1076A product line delivers core System Basis Chips for automotive ECUs, combining CAN interface, power regulation, and safety monitoring to simplify ECU architecture and accelerate ASIL-compliant development.

FAQ

What is the primary function of the UJA1076ATW/5V0,112 in an automotive ECU?

The UJA1076ATW/5V0,112 serves as a core System Basis Chip that replaces discrete CAN transceivers, voltage regulators, and watchdog circuits in automotive Electronic Control Units. It integrates a 5 V/250 mA microcontroller regulator (V1), a dedicated 5 V CAN transceiver regulator (V2), ISO 11898-2/5-compliant CAN PHY, SPI interface, dual wake-up inputs, and limp home output - enabling compact, robust, and safety-aware ECU designs. The UJA1076ATW/5V0,112 specifically implements these functions with automotive-grade transient protection and thermal shutdown.

Does the UJA1076ATW/5V0,112 support remote firmware updates?

Yes, the UJA1076ATW/5V0,112 supports remote flash programming via the CAN bus - allowing over-the-air (OTA) firmware updates without requiring physical debugger access. This capability relies on its integrated high-speed CAN transceiver and SPI-controlled register interface, which enables the host microcontroller to reconfigure SBC behavior and respond to network commands. The UJA1076ATW/5V0,112's design ensures secure and reliable update paths in vehicle lifecycle management systems.

How does the watchdog in the UJA1076ATW/5V0,112 differ from basic timeout watchdogs?

The UJA1076ATW/5V0,112 features an advanced programmable watchdog with three distinct operating modes: Window, Timeout, and Off - controlled via the WD_and_Status register and WDOFF pin. Unlike basic timeout watchdogs, its Window mode enforces strict timing windows (first half of period) for valid triggers, preventing premature or late resets. The on-chip oscillator provides independent timing, and watchdog overflow or mis-triggering results in immediate system reset - enhancing reliability in safety-critical automotive applications. The UJA1076ATW/5V0,112 also supports cyclic wake-up interrupts for low-power operation.

What thermal protection mechanisms does the UJA1076ATW/5V0,112 include?

The UJA1076ATW/5V0,112 incorporates overtemperature shutdown with automatic entry into Overtemp mode when junction temperature exceeds Tth(act)otp. In this state, it disables both V1 and V2 regulators, forces RSTN LOW, and drives the LIMP output LOW to activate fail-safe hardware. Recovery requires chip temperature to fall below Tth(rel)otp (with hysteresis), after which the device returns to Standby mode and executes a system reset. The HTSSOP32 package's exposed die pad further enhances thermal dissipation - critical for under-hood automotive environments. The UJA1076ATW/5V0,112's thermal behavior is fully documented in its functional description and mode transition diagrams.

Can the UJA1076ATW/5V0,112 operate during automotive cranking conditions?

Yes, the UJA1076ATW/5V0,112 is explicitly designed to operate during cranking: its V1 regulator maintains stable 5 V output down to VBAT = 4.5 V, and V2 operates down to VBAT = 5.5 V - complying with ISO 16750-2 and ISO 7637 standards. Undervoltage warnings and resets are configurable at 90 % or 70 % of nominal output, allowing robust MCU operation even during severe battery sag. The UJA1076ATW/5V0,112's low-power Standby/Sleep modes (<100 µA/<20 µA) also preserve functionality during extended cranking events without compromising wake capability.