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NXP Semiconductors UJA1078ATW/5V0/1J
- Part No.:
- UJA1078ATW/5V0/1J
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 32-TSSOP (0.240", 6.10mm Width) Exposed Pad
- Datasheet:
-
UJA1078ATW/5V0/1J.pdf
- Description:
- IC INTFACE SPECIALIZED 32HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,260
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Product details
Overview
UJA1078ATW/5V0/1J from NXP Semiconductors is a high-speed CAN/dual LIN core System Basis Chip (SBC) integrating a 5 V/250 mA microcontroller voltage regulator (V1), a dedicated 5 V CAN transceiver regulator (V2), ISO 11898-2/5-compliant HS-CAN transceiver, two LIN 2.2A transceivers, SPI interface, and advanced watchdog - deployed in automotive ECU power and communication subsystems for body control modules and gateway nodes.
For engineers reviewing the UJA1078ATW/5V0/1J datasheet, UJA1078ATW/5V0/1J pinout, UJA1078ATW/5V0/1J application, or UJA1078ATW/5V0/1J equivalent, key selection criteria include V1 output accuracy (±2 %), dual-LIN wake-up capability, CAN/LIN bus short-circuit protection (±58 V), thermal shutdown behavior, and HTSSOP32 package compatibility with automotive PCB layout constraints.
Technical Context
The UJA1078ATW/5V0/1J implements a state-machine-based system controller managing Off/Standby/Normal/Sleep/Overtemp modes with programmable transitions via SPI-controlled Mode_Control register (MC bits). It uses an on-chip oscillator independent of V1/V2 to clock the watchdog and internal timers.
Its dual-LIN architecture supports simultaneous LIN 2.2A compliance on both channels with selectable low-slope mode (10.4 kbit/s) for EMC optimization, while the HS-CAN transceiver features SPLIT pin stabilization and floating bus pins during power-off - all coordinated through 16-bit full-duplex SPI with read-only register access and interrupt-driven status reporting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Output Voltage | 5.0 V ±2 % - powers microcontroller and peripherals with stable regulation down to 4.5 V VBAT (cranking compliant) |
| V1 Max Current | 250 mA - extendable via external PNP transistor with configurable activation threshold (50/85 mA) |
| CAN Compliance | ISO 11898-2:2003 & ISO 11898-5:2006 - interoperable with TJA1042; supports bus wake-up detection in Lowpower mode |
| LIN Compliance | 2 × LIN 2.2A + SAE J2602 - backward compatible to LIN 1.0; integrated termination diode at DLIN pin |
| Watchdog Modes | Window, Timeout, Off - programmable period (8–4096 ms); triggered by WD_and_Status register write |
| ESD Protection | ±8 kV HBM / ±6 kV IEC 61000-4-2 on CAN/LIN/wake-up pins - meets automotive EMC requirements |
| Short-Circuit Robustness | ±58 V on CAN/LIN bus pins - enables operation under load dump and jump-start conditions |
| Package | HTSSOP32 (SOT549-1) - 6.1 mm × 11 mm, 0.65 mm pitch, exposed die pad for thermal dissipation |
Pinout & Package
UJA1078ATW/5V0/1J is housed in a 32-pin HTSSOP32 (SOT549-1) package with exposed thermal pad, optimized for automotive under-hood thermal performance and board-level EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 | Main microcontroller supply output | 5 V regulated output (±2 %), 250 mA max; connects to MCU VDD and decoupling caps |
| V2 | Dedicated CAN transceiver supply | 5 V regulator output solely for internal CAN PHY; can be disabled to reduce quiescent current |
| RXDC/TXDC | CAN data interface | CMOS-level signals between SBC and MCU's CAN controller; require external CAN controller |
| CANH/CANL | HS-CAN bus interface | Differential bus terminals with ±58 V short-circuit tolerance and SPLIT pin for recessive level stabilization |
| RXDL1/TXDL1 & RXDL2/TXDL2 | Dual LIN data interfaces | Separate CMOS I/O pairs for LIN1/LIN2; support bidirectional communication per LIN spec |
| WAKE1/WAKE2 | Local wake-up inputs | Analog inputs detecting external switch closure; sampling configurable (16/64 ms) via WBIAS and WBC bit |
| LIMP | Limp home activation output | Active-low open-drain output driving external fail-safe hardware upon overtemperature or critical fault |
| SDI/SDO/SCK/SCSN | SPI interface | Full-duplex 16-bit SPI for configuration, diagnostics, and status readback; SDO floats when SCSN HIGH |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-LIN + HS-CAN transceivers | Eliminates 3 discrete transceivers and associated passive components; reduces BOM count and PCB area in body ECUs |
| Scalable 5 V/250 mA V1 regulator with PNP extension | Enables thermal load sharing across PCB; avoids localized hot spots when powering 32-bit MCUs with peripherals |
| Programmable watchdog with on-chip oscillator | Independent timing source ensures reliable reset supervision even if V1/V2 are unstable or unpowered |
| Multi-mode power management (Standby/Sleep/Normal) | Supports <100 µA sleep current with full wake-up capability via CAN/LIN/local pins - critical for always-on gateways |
| Comprehensive fault reporting via SPI | Real-time status registers (WD_and_Status, Int_Status) enable predictive diagnostics and safe ECU recovery sequences |
| Automotive-grade bus protection | ±58 V short-circuit, ±8 kV HBM, and ISO 7637-3 transient immunity allow direct connection to vehicle harnesses without add-on protection |
Applications
| Body Control Module (BCM) | Door Module ECU |
|---|---|
Use Scenario: Centralized control of door locks, windows, mirrors, and interior lighting using LIN slaves and CAN backbone connectivity. IC Role / Device Role / Timing Role: UJA1078ATW/5V0/1J serves as the primary power and communication hub - regulating MCU voltage, enabling LIN sub-bus communication to sensors/actuators, and bridging to CAN for gateway coordination. Use Value: Reduces component count by integrating dual-LIN transceivers, 5 V regulator, and CAN interface - lowering assembly cost and improving reliability versus discrete solutions. | Use Scenario: Distributed door node managing window lift motors, anti-pinch sensors, and keyless entry receivers in harsh thermal environments. IC Role / Device Role / Timing Role: UJA1078ATW/5V0/1J provides robust 5 V power delivery, LIN communication to window motor drivers, and local wake-up via mechanical switches - operating reliably at -40 °C to +125 °C junction temperature. Use Value: ±58 V bus tolerance and ±8 kV HBM ESD withstand eliminate need for external TVS diodes on LIN lines, simplifying layout and enhancing long-term field reliability. |
| Roof Module Gateway | Seat Control Unit |
Use Scenario: Roof-mounted module aggregating sunroof, ambient lighting, and rain sensor data, communicating via CAN to body domain controller. IC Role / Device Role / Timing Role: UJA1078ATW/5V0/1J supplies regulated 5 V to MCU and sensors, manages CAN physical layer, and enables remote flash programming over CAN bus. Use Value: SPI-configurable watchdog and detailed interrupt/status registers support secure OTA update workflows with verified reset supervision and fault logging. | Use Scenario: Seat ECU controlling position motors, heating elements, and occupancy sensors with LIN-connected seatbelt buckle and airbag pretensioner interfaces. IC Role / Device Role / Timing Role: UJA1078ATW/5V0/1J delivers stable 5 V power, drives two independent LIN buses (one for seat controls, one for safety systems), and asserts LIMP output on overtemperature or undervoltage faults. Use Value: Dedicated LIMP pin enables immediate activation of mechanical seat lock or heater cutoff - meeting ASIL-B functional safety requirements without additional logic ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar System Basis Chip applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UJA1076ATW/5V0/1J | Single-LIN variant; lacks second LIN transceiver and DLIN pin; identical V1/V2 regulators and CAN functionality | Suitable only for ECUs requiring one LIN sub-bus; not interchangeable where dual-LIN topology is mandatory | Select UJA1076ATW/5V0/1J only when LIN2 channel is unused and BOM cost reduction is prioritized |
| TJA1044GT/3 | Standalone HS-CAN transceiver only; no voltage regulators, LIN, SPI, or watchdog - requires external power and microcontroller interface | Used in simpler CAN nodes without LIN or power integration needs; cannot replace full SBC functionality | Choose TJA1044GT/3 only for point-to-point CAN links where UJA1078ATW/5V0/1J's integrated features are unnecessary |
Compared with UJA1078ATW/5V0/1J, UJA1076ATW/5V0/1J reduces integration depth by removing one LIN channel but retains identical power and CAN capabilities, whereas TJA1044GT/3 offers no power or LIN functionality - making it a partial-function alternative requiring significant external circuitry.
Availability
UJA1078ATW/5V0/1J is available at Aetrix Electronics and suitable for automotive body control modules, door ECUs, roof gateways, and seat control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for UJA1078ATW/5V0/1J 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 automotive, industrial, and IoT applications, with deep expertise in vehicle networking and power management ICs.
The UJA1078ATW/5V0/1J belongs to NXP's System Basis Chip product line, engineered specifically for automotive electronic control units requiring integrated high-speed CAN, dual LIN, regulated power, and robust fault management in space-constrained designs.
FAQ
What is the nominal output voltage and accuracy of the main regulator (V1) in UJA1078ATW/5V0/1J?
The UJA1078ATW/5V0/1J features a 5.0 V main regulator (V1) with ±2 % output voltage accuracy across temperature and load conditions. This specification ensures stable power delivery to automotive microcontrollers and peripherals, maintaining operation during cranking events down to 4.5 V battery voltage as defined in ISO 16750-2. The UJA1078ATW/5V0/1J datasheet confirms this value in Section 2.6.
Does UJA1078ATW/5V0/1J support remote firmware updates over the CAN bus?
Yes, UJA1078ATW/5V0/1J supports remote flash programming via the CAN bus, as explicitly stated in Section 2.1 of the datasheet. This capability relies on its integrated HS-CAN transceiver and SPI-configurable system controller, enabling secure bootloader execution and diagnostic session initiation without physical tool access. The UJA1078ATW/5V0/1J must be paired with a CAN controller-equipped MCU to implement the full update protocol.
What are the wake-up sources supported by UJA1078ATW/5V0/1J?
The UJA1078ATW/5V0/1J supports three independent wake-up sources: HS-CAN bus activity, dual-LIN bus activity (LIN1 and LIN2), and two local wake-up inputs (WAKE1 and WAKE2). Each source is individually configurable via SPI registers (e.g., STBCC, STBCL1, STBCL2, WIC1/WIC2), and wake-up detection remains fully functional in Standby and Sleep modes. The UJA1078ATW/5V0/1J also provides wake-up source identification through status bits WLS1/WLS2 and interrupt flags in the Int_Status register.
How does the LIMP output function in UJA1078ATW/5V0/1J during a fault condition?
The LIMP output in UJA1078ATW/5V0/1J is an active-low open-drain signal that drives LOW during critical system faults including overtemperature shutdown or severe undervoltage events. It is controlled by the LHC bit in the Mode_Control register and automatically asserted when Overtemp mode activates. The UJA1078ATW/5V0/1J LIMP pin directly interfaces with external fail-safe hardware (e.g., mechanical locks or heater cutoffs) without requiring additional logic, fulfilling ASIL-B functional safety requirements in automotive seat or door modules.
Is the watchdog in UJA1078ATW/5V0/1J dependent on the V1 or V2 supply rails?
No, the watchdog in UJA1078ATW/5V0/1J is clocked by an on-chip oscillator powered independently from VBAT, making it operational even when V1 or V2 regulators are disabled or unpowered. This design ensures continuous supervision during power sequencing, Standby mode, or brown-out conditions. The UJA1078ATW/5V0/1J watchdog supports Window, Timeout, and Off modes, with period programmable from 8 ms to 4096 ms via the NWP bits in the WD_and_Status register.
UJA1078ATW/5V0/1J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 32-TSSOP (0.240", 6.10mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Applications:
- -
- Interface:
- CAN, LIN
- Voltage - Supply:
- 4.5V ~ 28V
- Supplier Device Package:
- 32-HTSSOP
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
UJA1078ATW/5V0/1J FAQ
1.How can I place an order for UJA1078ATW/5V0/1J through Aetrix?
Please submit a Request for Quotation (RFQ) for UJA1078ATW/5V0/1J 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/5V0/1J reliable?
The price and inventory of UJA1078ATW/5V0/1J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UJA1078ATW/5V0/1J is usually 5 days.
3.What payment methods are accepted for UJA1078ATW/5V0/1J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UJA1078ATW/5V0/1J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UJA1078ATW/5V0/1J?
UJA1078ATW/5V0/1J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UJA1078ATW/5V0/1J 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/5V0/1J?
For technical support, including UJA1078ATW/5V0/1J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UJA1078ATW/5V0/1J requirements.
6.How does Aetrix verify that UJA1078ATW/5V0/1J is sourced from the original manufacturer or authorized distributors?
All UJA1078ATW/5V0/1J 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/5V0/1J meets industry standards.
7.What is the process for return or replacement of UJA1078ATW/5V0/1J?
All UJA1078ATW/5V0/1J units undergo pre-shipment inspection (PSI). If there is an issue with UJA1078ATW/5V0/1J, 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/5V0/1J part is unused and in its original packaging.
Return procedure for UJA1078ATW/5V0/1J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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