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NXP Semiconductors UJA1078TW/3V3/WD:1
- Part No.:
- UJA1078TW/3V3/WD:1
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 32-TSSOP (0.240", 6.10mm Width) Exposed Pad
- Datasheet:
-
UJA1078TW/3V3/WD:1.pdf
- Description:
- IC INTFACE SPECIALIZED 32HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,425
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Product details
Overview
UJA1078TW/3V3/WD:1 from NXP Semiconductors is a core System Basis Chip (SBC) integrating a high-speed CAN transceiver (ISO 11898-2/5 compliant), two LIN 2.1 transceivers, a 3.3 V/250 mA microcontroller voltage regulator (V1), a dedicated 5 V CAN transceiver regulator (V2), and an advanced window/timeout watchdog. It serves as the central power, communication, and safety controller in automotive ECUs, enabling controlled startup, bus wake-up, and limp-home functionality.
For engineers reviewing the UJA1078TW/3V3/WD:1 datasheet, UJA1078TW/3V3/WD:1 pinout, UJA1078TW/3V3/WD:1 application, or UJA1078TW/3V3/WD:1 equivalent, this device delivers verified automotive-grade ECU integration with precise 3.3 V regulation, dual-LIN sub-bus control, SPI-configurable diagnostics, ±58 V short-circuit protected bus pins, and ISO 7637-3 transient immunity - critical for body control modules, gateway units, and sensor cluster designs.
Technical Context
The UJA1078TW/3V3/WD:1 implements a state-machine-based system controller managing Off/Standby/Normal/Sleep/Overtemp modes with deterministic transitions triggered by VBAT thresholds, wake events, or thermal conditions. Its SPI interface (full-duplex, 16-bit) enables real-time register access to WD_and_Status, Mode_Control, and Int_Status registers for dynamic configuration of watchdog timing (128 ms default), LIN slope (10.4/20 kbit/s), and wake-source sampling (16/64 ms).
Power architecture separates V1 (3.3 V, ±2 % for LIN master, ±3 % for LIN slave) and V2 (5 V, independent CAN supply) with undervoltage detection at 90 % nominal and reset at 90 % or 70 % V1. Bus interfaces feature floating CANH/CANL in Off mode, SPLIT pin for recessive-level stabilization, integrated LIN termination diode at DLIN, and low-slope LIN operation for optimized EMC performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CAN Interface | High-speed, ISO 11898-2 and ISO 11898-5 compliant; supports bus wake-up and floating pins in Off mode |
| LIN Interfaces | Dual, LIN 2.1/SAE J2602 compliant; downward compatible with LIN 2.0/1.3; low-slope mode for EMC |
| V1 Regulator | 3.3 V output, ±2 % accuracy for LIN master, ±3 % for LIN slave; 250 mA max; external PNP support for thermal distribution |
| V2 Regulator | 5 V output for internal CAN transceiver; switchable off; operates down to 5.5 V during cranking (ISO 7637 pulse 4) |
| Watchdog | Window and Timeout modes; on-chip oscillator clock source; programmable period (128 ms default); WDOFF pin disable |
| ESD Protection | ±8 kV HBM and ±6 kV IEC 61000-4-2 on CAN/LIN/WAKE pins |
| Short-Circuit Tolerance | ±58 V on all CAN/LIN bus pins; battery and bus pins protected per ISO 7637-3 |
Pinout & Package
Package: HTSSOP32 (SOT549-1), 6.1 mm × 11 mm, 0.65 mm pitch, exposed die pad for thermal dissipation (electrically isolated, may be left floating or tied to GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 (Pin 4) | Main microcontroller supply output | 3.3 V regulated output; ±2 % accuracy for LIN master applications; supports external PNP transistor via VEXCTRL/VEXCC |
| V2 (Pin 20) | CAN transceiver supply output | 5 V dedicated regulator; can be disabled to reduce power; stable down to 5.5 V VBAT |
| RSTN (Pin 6) | Bidirectional reset I/O | Drives microcontroller reset; variable power-on reset length; software-initiated reset supported |
| INTN (Pin 7) | Interrupt output | Open-drain signal indicating V1/V2 undervoltage, CAN/LIN/wake events, cyclic interrupts, or power-on |
| WDOFF (Pin 16) | Watchdog disable control | Active-HIGH input disabling watchdog; triggers software reset when asserted |
| LIMP (Pin 17) | Limp-home activation output | Active-LOW signal driving external 'limp home' hardware during overtemperature or critical failure |
| SPLIT (Pin 24) | CAN common-mode stabilization | Output for external 4.7 nF capacitor to stabilize recessive bus level and reduce ringing |
| WAKE1/WAKE2 (Pins 18/19) | Local wake-up inputs | Configurable sampling (16/64 ms); biasable via WBIAS (Pin 28); switchable off to minimize standby current |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-LIN + high-speed CAN | Eliminates discrete transceivers; reduces BOM count and PCB area while ensuring interoperability with TJA1042 and legacy LIN nodes |
| Scalable 3.3 V microcontroller supply | 250 mA output with ±2 % accuracy for LIN master timing; external PNP extension enables >1 A total current with distributed thermal load |
| Advanced watchdog with window mode | Prevents runaway code execution via time-bound window checking; independent on-chip oscillator ensures reliability during V1/V2 brownouts |
| Full diagnostic SPI interface | 16-bit full-duplex communication enables real-time readback of WD_and_Status, Int_Status, and Mode_Control registers for fault logging and remote flash coordination |
| Automotive-grade protection suite | ±58 V bus short-circuit tolerance, ISO 7637-3 transient immunity, ±8 kV HBM ESD, and overtemperature shutdown with limp-home activation |
Applications
| Body Control Module (BCM) | Door Module Controller |
|---|---|
Use Scenario: Centralized control of lighting, windows, locks, and mirrors in passenger vehicles using CAN backbone and LIN sub-networks. IC Role / Device Role / Timing Role: UJA1078TW/3V3/WD:1 acts as primary power manager and bus interface, supplying 3.3 V to MCU, regulating CAN transceiver voltage, and enabling wake-up from LIN sensors or door switches. Use Value: Enables ultra-low standby current (< 100 µA) with full wake-up capability via CAN/LIN/local inputs, meeting OEM sleep-mode requirements while maintaining robust fault reporting via SPI. | Use Scenario: Distributed control unit mounted inside vehicle door, managing window lift, mirror adjustment, and interior lighting via LIN slaves. IC Role / Device Role / Timing Role: UJA1078TW/3V3/WD:1 provides 3.3 V power to door MCU, drives LIN1/LIN2 buses to window motor and mirror ICs, and detects local wake events (e.g., door handle switch) via WAKE1/WAKE2. Use Value: Integrated LIN transceivers eliminate external level shifters; low-slope mode ensures EMC compliance in cramped door harnesses; LIMP output activates mechanical fail-safe window stop during overtemperature. |
| Gateway ECU | Sensor Cluster Interface |
Use Scenario: In-vehicle network gateway bridging CAN FD backbone with multiple LIN sensor clusters (e.g., HVAC, seat, steering wheel). IC Role / Device Role / Timing Role: UJA1078TW/3V3/WD:1 serves as LIN subsystem controller, powering LIN masters/slaves, managing bus arbitration, and relaying diagnostics to main CAN controller via SPI. Use Value: Dual independent LIN transceivers allow concurrent communication with separate clusters; V2-regulated CAN interface ensures signal integrity during cranking; SPI enables seamless integration with gateway MCU firmware. | Use Scenario: Centralized interface for analog/digital sensors (temperature, humidity, rain, light) in roof console or dashboard, communicating via LIN to body domain controller. IC Role / Device Role / Timing Role: UJA1078TW/3V3/WD:1 supplies stable 3.3 V to sensor signal conditioning circuitry, hosts LIN2 bus for sensor polling, and reports faults (e.g., V1 undervoltage) via INTN to host MCU. Use Value: ±2 % V1 accuracy guarantees precise ADC reference for sensor readings; integrated LIN termination diode at DLIN simplifies board layout; wake-up on sensor alert reduces system latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar System Basis Chip applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UJA1076TW/3V3/WD | Single-LIN variant; lacks second LIN transceiver and DLIN pin; identical CAN, V1/V2, watchdog, and SPI functionality | Suitable only for single-LIN sub-bus systems; cannot replace dual-LIN topology without redesign | Select when LIN2 is unused and cost reduction is prioritized over future LIN expansion |
| TJA1128ATK/3V3 | Next-generation SBC with CAN FD support, higher V1 current (350 mA), and enhanced SPI diagnostics; no WDOFF pin or LIMP output | Requires firmware update for CAN FD protocol; lacks limp-home hardware activation capability | Choose for new designs needing CAN FD bandwidth and higher MCU supply current; not drop-in for limp-home safety-critical use cases |
Compared with UJA1078TW/3V3/WD:1, UJA1076TW/3V3/WD omits LIN2 functionality but retains identical 3.3 V regulation and watchdog behavior, while TJA1128ATK/3V3 upgrades CAN to FD and increases V1 current but removes dedicated limp-home signaling - making UJA1078TW/3V3/WD:1 uniquely suited for dual-LIN automotive modules requiring fail-safe hardware activation.
Availability
UJA1078TW/3V3/WD:1 is available at Aetrix Electronics and suitable for automotive body electronics, gateway ECUs, and sensor interface modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for UJA1078TW/3V3/WD:1 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 networking and power management ICs.
The UJA1078TW/3V3/WD:1 belongs to NXP's System Basis Chip product line, designed specifically to consolidate core ECU functions - including CAN/LIN physical layers, multi-rail power regulation, watchdog supervision, and diagnostic interfaces - into a single AEC-Q100 qualified package for cost-sensitive, space-constrained automotive control units.
FAQ
What is the nominal output voltage and accuracy of the V1 regulator in UJA1078TW/3V3/WD:1?
The UJA1078TW/3V3/WD:1 features a 3.3 V V1 regulator with ±2 % output accuracy specified for LIN master applications and ±3 % for LIN slave applications. This precision ensures reliable timing for LIN communication and stable MCU operation under varying load and temperature conditions, as confirmed in Section 2.6 of the official datasheet.
Does UJA1078TW/3V3/WD:1 support both CAN and LIN wake-up events in Standby mode?
Yes, UJA1078TW/3V3/WD:1 supports wake-up from Standby mode via high-speed CAN bus activity, either LIN1 or LIN2 bus activity, and local wake-up inputs WAKE1 or WAKE2. The system controller monitors these sources continuously, and a detected event triggers transition to Normal mode with a system reset, as detailed in Sections 6.1.3 and 6.7–6.8 of the datasheet.
How does the watchdog function differ between Window and Timeout modes in UJA1078TW/3V3/WD:1?
In Window mode, the UJA1078TW/3V3/WD:1 requires watchdog triggers within a defined time window (first half of period) to avoid reset; triggering too early or after timeout causes immediate reset. In Timeout mode, only overflow triggers reset. Both modes use the on-chip oscillator and support programmable periods (e.g., 128 ms default), with mode selection controlled by the WMC bit in the WD_and_Status register.
Can UJA1078TW/3V3/WD:1 operate during automotive cranking conditions?
Yes, UJA1078TW/3V3/WD:1 is designed to operate during cranking: V1 regulator functions down to 4.5 V VBAT (per ISO 7637 pulse 4/4b), and V2 regulator operates down to 5.5 V VBAT (per ISO 7637 pulse 4). This ensures continuous CAN/LIN communication and MCU power delivery even during engine start transient events.
What is the purpose of the SPLIT pin on UJA1078TW/3V3/WD:1, and how is it used?
Pin 24 (SPLIT) on UJA1078TW/3V3/WD:1 provides a common-mode stabilization output for the CAN bus. It connects to a 4.7 nF capacitor to ground to reduce bus reflections and improve signal integrity during recessive states. This feature directly enhances EMC performance and is required for stable high-speed CAN operation in noisy automotive environments.
UJA1078TW/3V3/WD:1 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:
- Obsolete
- Applications:
- -
- Interface:
- CAN, LIN
- Voltage - Supply:
- 4.5V ~ 28V
- Supplier Device Package:
- 32-HTSSOP
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
UJA1078TW/3V3/WD:1 FAQ
1.How can I place an order for UJA1078TW/3V3/WD:1 through Aetrix?
Please submit a Request for Quotation (RFQ) for UJA1078TW/3V3/WD:1 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 UJA1078TW/3V3/WD:1 reliable?
The price and inventory of UJA1078TW/3V3/WD:1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UJA1078TW/3V3/WD:1 is usually 5 days.
3.What payment methods are accepted for UJA1078TW/3V3/WD:1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UJA1078TW/3V3/WD:1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UJA1078TW/3V3/WD:1?
UJA1078TW/3V3/WD:1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UJA1078TW/3V3/WD:1 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 UJA1078TW/3V3/WD:1?
For technical support, including UJA1078TW/3V3/WD:1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UJA1078TW/3V3/WD:1 requirements.
6.How does Aetrix verify that UJA1078TW/3V3/WD:1 is sourced from the original manufacturer or authorized distributors?
All UJA1078TW/3V3/WD:1 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 UJA1078TW/3V3/WD:1 meets industry standards.
7.What is the process for return or replacement of UJA1078TW/3V3/WD:1?
All UJA1078TW/3V3/WD:1 units undergo pre-shipment inspection (PSI). If there is an issue with UJA1078TW/3V3/WD:1, 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 UJA1078TW/3V3/WD:1 part is unused and in its original packaging.
Return procedure for UJA1078TW/3V3/WD:1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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