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NXP Semiconductors UJA1078ATW/3V3/WD,
- Part No.:
- UJA1078ATW/3V3/WD,
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 32-TSSOP (0.240", 6.10mm Width) Exposed Pad
- Datasheet:
-
UJA1078ATW/3V3/WD,.pdf
- Description:
- IC INTFACE SPECIALIZED 32HTSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
UJA1078ATW/3V3/WD from NXP Semiconductors is a high-speed CAN/dual LIN core System Basis Chip (SBC) integrating a 3.3 V/250 mA microcontroller regulator, dedicated 5 V CAN transceiver regulator, ISO 11898-2/5-compliant CAN transceiver, two LIN 2.2A transceivers, SPI interface, advanced watchdog, and limp home output - deployed in automotive ECUs for powertrain and body control modules.
For engineers reviewing the UJA1078ATW/3V3/WD datasheet, UJA1078ATW/3V3/WD pinout, UJA1078ATW/3V3/WD application, or UJA1078ATW/3V3/WD equivalent, key selection criteria include 3.3 V V1 regulator accuracy (±2 %), dual LIN wake-up capability, CAN/LIN bus ESD robustness (±8 kV HBM), HTSSOP32 thermal performance, and watchdog window/timeout mode configurability via SPI.
Technical Context
The UJA1078ATW/3V3/WD implements a state-machine-based system controller managing Off/Standby/Normal/Sleep/Overtemp modes with deterministic transitions triggered by VBAT thresholds, wake events, or register writes. Its SPI interface operates full-duplex with 16-bit framing, register-mapped access (WD_and_Status, Mode_Control, Int_Control), and read-only options for status monitoring without side effects.
Power management includes independent V1 (3.3 V, ±2 %, 250 mA) and V2 (5 V) regulators, external PNP biasing via VEXCTRL/VEXCC, programmable wake-up sampling (16 ms/64 ms), and undervoltage detection at 90 %/70 % of nominal output. The CAN transceiver features SPLIT pin stabilization and floating bus pins in Off mode; LIN transceivers support low-slope mode and integrated termination diode at DLIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CAN Interface | ISO 11898-2:2003 & ISO 11898-5:2006 compliant; enables interoperability with TJA1042 and robust high-speed vehicle networking. |
| LIN Interfaces | Two LIN 2.2A transceivers compliant with SAE J2602 and backward-compatible to LIN 1.0; supports local sub-bus sensor/actuator control. |
| V1 Regulator | 3.3 V ±2 % output delivering up to 250 mA; supports microcontroller + peripherals; extendable with external PNP for thermal distribution. |
| V2 Regulator | Dedicated 5 V regulator for on-chip CAN transceiver; improves EMC by isolating CAN supply from MCU rail; switchable off. |
| Watchdog | Programmable window/timeout/off modes with on-chip oscillator clock source; default period 128 ms; WDOFF pin disables it externally. |
| ESD Protection | ±8 kV HBM and ±6 kV IEC 61000-4-2 on CAN/LIN/wake-up pins; ensures reliability in harsh automotive environments. |
| Package | HTSSOP32 (6.1 mm × 11 mm); exposed die pad for enhanced thermal dissipation; RoHS and dark green compliant. |
Pinout & Package
UJA1078ATW/3V3/WD uses a 32-pin HTSSOP package (SOT549-1) with 0.65 mm pitch and thermally enhanced exposed die pad soldered to PCB ground for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 | Main MCU supply output | 3.3 V regulated output (±2 %) powering microcontroller and peripherals; supports external PNP extension via VEXCTRL/VEXCC. |
| V2 | CAN transceiver supply | Dedicated 5 V regulator output; electrically isolated from V1 to improve EMC; can be disabled to reduce quiescent current. |
| RXDC/TXDC | CAN data interface | Digital inputs/outputs connecting to MCU's CAN controller; enable full-duplex high-speed CAN communication. |
| RXDL1/TXDL1, RXDL2/TXDL2 | LIN data interfaces | Two independent LIN data paths for separate LIN sub-networks; support LIN 2.2A protocol timing and diagnostics. |
| WAKE1/WAKE2 | Local wake-up inputs | Analog inputs detecting voltage thresholds; configurable sampling (16 ms/64 ms) to minimize standby current while retaining wake sensitivity. |
| LIMP | Limp home control output | Active-low open-drain output activating fail-safe hardware during critical faults; controlled via LHC bit in Mode_Control register. |
| SPI (SDI/SDO/SCK/SCSN) | Configuration & diagnostics | Full-duplex 16-bit SPI interface enabling real-time register read/write for mode control, interrupt masking, and status reporting. |
| INTN | Interrupt notification | Open-drain output signaling V1/V2 undervoltage, CAN/LIN/wake-up events, or cyclic interrupts; individually maskable via Int_Control register. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-LIN + high-speed CAN | Reduces BOM count by replacing discrete transceivers and interface logic; supports centralized ECU architecture with distributed sensors/actuators. |
| Scalable 3.3 V V1 regulator | Delivers 250 mA with ±2 % accuracy down to 4.5 V VBAT (cranking); external PNP option shifts thermal load from SBC to PCB for higher-reliability designs. |
| Advanced watchdog with window mode | Prevents runaway code via time-constrained reset windows; independent oscillator ensures operation even if V1/V2 are unstable or absent. |
| Bus-level wake-up detection | Enables ultra-low-power Standby/Sleep modes while maintaining CAN/LIN/local wake responsiveness; supports ISO 16750-2 cold-cranking behavior. |
| Limp home output with fault latching | Drives safety-critical hardware (e.g., mechanical valve fallback) upon overtemperature or system failure; latched via LHC bit until reset clears condition. |
Applications
| Powertrain Control Unit | Body Control Module |
|---|---|
Use Scenario: ECU managing engine timing, fuel injection, and emissions control in ICE vehicles. IC Role / Device Role / Timing Role: Core SBC providing regulated 3.3 V power to MCU, CAN interface to engine control network, and LIN links to throttle position and knock sensors. Use Value: Enables safe startup/shutdown sequencing, bus wake-up during cranking, and limp-home activation if coolant temperature exceeds threshold. | Use Scenario: Centralized module controlling door locks, lighting, HVAC, and seat position in passenger vehicles. IC Role / Device Role / Timing Role: Power management and communication hub supplying MCU, interfacing with CAN backbone, and managing two LIN subnets for interior actuators. Use Value: Reduces component count vs. discrete solutions; supports low-current Standby mode with wake-on-LIN message for remote keyless entry. |
| Advanced Driver Assistance Systems | Electric Vehicle Battery Management |
Use Scenario: Radar/EPS/ecu coordinating collision avoidance, lane keeping, and steering assist functions. IC Role / Device Role / Timing Role: System basis chip delivering stable 3.3 V power, CAN connectivity to ADAS domain controller, and LIN interface to camera focus motor. Use Value: Ensures deterministic watchdog behavior and fast wake-from-sleep (<100 µs) for time-critical sensor fusion processing. | Use Scenario: BMS node communicating cell voltage readings and thermal data across battery pack modules. IC Role / Device Role / Timing Role: Local SBC powering MCU and isolating CAN communication from noisy high-voltage domains using dedicated V2 regulator. Use Value: V2's electrical isolation prevents CAN transceiver noise coupling into sensitive analog measurement circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar System Basis Chip applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TJA1023BK | Single-LIN SBC with 5 V V1 regulator; no dual-LIN or 3.3 V option; lacks SPI diagnostics and limp home output. | Suitable only for simpler LIN-only nodes without CAN backbone integration or fail-safe requirements. | Select when cost-sensitive LIN gateway applications do not require CAN, dual-LIN, or advanced diagnostics. |
| UJA1076ATW/3V3/WD | Same family but single-LIN variant; identical 3.3 V V1, watchdog, SPI, and HTSSOP32 package; missing second LIN transceiver and associated pins (RXDL2/TXDL2/DLIN/LIN2). | Used where only one LIN sub-bus is needed - e.g., climate control ECU without secondary actuator network. | Choose for footprint-compatible upgrade path if future design expansion to dual-LIN is anticipated. |
Compared with TJA1023BK and UJA1076ATW/3V3/WD, the UJA1078ATW/3V3/WD uniquely delivers dual-LIN support alongside high-speed CAN, 3.3 V precision regulation, and limp home functionality - making it the only option for complex automotive ECUs requiring redundant local networks and fail-safe response.
Availability
UJA1078ATW/3V3/WD is available at Aetrix Electronics and suitable for automotive powertrain control, body electronics, ADAS domain controllers, and EV battery management systems requiring stable component supply, AEC-Q100 qualification, and long-term lifecycle support.
Supply support for UJA1078ATW/3V3/WD 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.
The UJA1078A product line delivers integrated System Basis Chips targeting next-generation automotive ECUs, combining power management, communication interfaces, and functional safety features to simplify ECU design and improve system reliability.
FAQ
What is the nominal output voltage and accuracy of the main regulator in UJA1078ATW/3V3/WD?
The UJA1078ATW/3V3/WD features a 3.3 V main regulator (V1) with ±2 % output voltage accuracy across temperature and load conditions. This precision ensures reliable operation of connected microcontrollers and peripherals, especially during cranking when VBAT drops to 4.5 V - a requirement defined in ISO 7637 and ISO 16750-2.
Does UJA1078ATW/3V3/WD support both CAN and LIN communication simultaneously?
Yes, UJA1078ATW/3V3/WD supports concurrent high-speed CAN and dual-LIN communication. Its integrated ISO 11898-2/5-compliant CAN transceiver operates alongside two independent LIN 2.2A transceivers, allowing the SBC to serve as a central hub connecting to vehicle backbone networks and local sensor/actuator sub-buses without external level-shifting or arbitration logic.
How does the watchdog function in UJA1078ATW/3V3/WD differ from basic timeout types?
The UJA1078ATW/3V3/WD watchdog supports three distinct modes: Window, Timeout, and Off. In Window mode, resets occur only if triggered outside a defined time window - preventing both early and late triggers caused by software hangs or timing jitter. This differs from simple timeout watchdogs by adding temporal validation, enhancing robustness in safety-critical automotive firmware.
Can UJA1078ATW/3V3/WD operate during automotive cranking conditions?
Yes, UJA1078ATW/3V3/WD is designed to maintain operation during cranking, supporting VBAT down to 4.5 V for V1 regulator operation and 5.5 V for V2 regulator operation - meeting ISO 7637 pulse 4 and ISO 16750-2 cold-cranking specifications. Its advanced low-power concept ensures wake-up capability and regulated outputs remain functional even under severe battery sag.
What is the purpose of the LIMP output pin on UJA1078ATW/3V3/WD?
The LIMP output pin on UJA1078ATW/3V3/WD is an active-low, open-drain signal used to activate application-specific 'limp home' hardware - such as mechanical valve fallbacks or reduced-power operating modes - during serious system malfunctions like overtemperature shutdown or critical undervoltage. It is controlled via the LHC bit in the Mode_Control register and latches until cleared by system reset.
UJA1078ATW/3V3/WD, Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 32-TSSOP (0.240", 6.10mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- -
- Interface:
- CAN, LIN
- Voltage - Supply:
- 4.5V ~ 28V
- Supplier Device Package:
- 32-HTSSOP
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
UJA1078ATW/3V3/WD, FAQ
1.How can I place an order for UJA1078ATW/3V3/WD, through Aetrix?
Please submit a Request for Quotation (RFQ) for UJA1078ATW/3V3/WD, on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for UJA1078ATW/3V3/WD, reliable?
The price and inventory of UJA1078ATW/3V3/WD, are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UJA1078ATW/3V3/WD, is usually 5 days.
3.What payment methods are accepted for UJA1078ATW/3V3/WD,?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UJA1078ATW/3V3/WD, transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UJA1078ATW/3V3/WD,?
UJA1078ATW/3V3/WD, orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UJA1078ATW/3V3/WD, order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for UJA1078ATW/3V3/WD,?
For technical support, including UJA1078ATW/3V3/WD, datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UJA1078ATW/3V3/WD, requirements.
6.How does Aetrix verify that UJA1078ATW/3V3/WD, is sourced from the original manufacturer or authorized distributors?
All UJA1078ATW/3V3/WD, products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that UJA1078ATW/3V3/WD, meets industry standards.
7.What is the process for return or replacement of UJA1078ATW/3V3/WD,?
All UJA1078ATW/3V3/WD, units undergo pre-shipment inspection (PSI). If there is an issue with UJA1078ATW/3V3/WD,, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The UJA1078ATW/3V3/WD, part is unused and in its original packaging.
Return procedure for UJA1078ATW/3V3/WD,:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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