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NXP Semiconductors UJA1078ATW/3V3/WDJ
- Part No.:
- UJA1078ATW/3V3/WDJ
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 32-TSSOP (0.240", 6.10mm Width) Exposed Pad
- Datasheet:
-
UJA1078ATW/3V3/WDJ.pdf
- Description:
- IC INTFACE SPECIALIZED 32HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,322
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Product details
Overview
UJA1078ATW/3V3/WDJ 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 HS-CAN transceiver, two LIN 2.2A transceivers compliant with SAE J2602, and an advanced window/timeout watchdog - all in a single HTSSOP32 package for automotive ECU power and communication management.
For engineers reviewing the UJA1078ATW/3V3/WDJ datasheet, UJA1078ATW/3V3/WDJ pinout, UJA1078ATW/3V3/WDJ application, or UJA1078ATW/3V3/WDJ equivalent, this device serves as a drop-in replacement for discrete CAN/LIN power architectures in body control modules, gateway ECUs, and sensor fusion nodes requiring robust wake-up handling, limp-home capability, and remote flash programming via CAN.
Technical Context
The UJA1078ATW/3V3/WDJ implements a hierarchical system controller state machine managing Off, Standby, Normal, Sleep, and Overtemp modes with deterministic transitions triggered by VBAT thresholds, bus activity, local wake inputs, or SPI commands. Its dual-regulator architecture isolates V1 (3.3 V ±2 %, 250 mA) for MCU/peripherals from V2 (5 V, CAN-only), enabling independent undervoltage monitoring and cranking operation down to 4.5 V (V1) and 5.5 V (V2).
It features full-duplex SPI (16-bit, rising-edge shift, falling-edge sample) for register-level configuration of watchdog timing (8–4096 ms), LIN slope (10.4/20 kbit/s), wake sampling (16/64 ms), and transceiver standby states - while supporting simultaneous CAN bus wake detection, dual-LIN wake, and two programmable local wake inputs with bias control via WBIAS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CAN Interface | ISO 11898-2:2003 & ISO 11898-5:2006 compliant HS-CAN transceiver with floating bus pins in Off mode and SPLIT output for recessive level stabilization |
| LIN Interfaces | Two independent LIN 2.2A transceivers compliant with SAE J2602 and downward compatible to LIN 1.0; integrated DLIN termination diode |
| V1 Regulator | 3.3 V ±2 % output, 250 mA max, supports external PNP transistor for thermal load sharing; operates down to 4.5 V VBAT during cranking |
| V2 Regulator | 5 V dedicated regulator for internal CAN transceiver; switchable off; stable down to 5.5 V VBAT |
| Watchdog | Window/Timeout/Off modes with on-chip oscillator clock source; default period 128 ms; programmable via NWP bits (8–4096 ms) |
| SPI Interface | Full-duplex 16-bit interface with SCSN/SCK/SDI/SDO; register read/write access; RO bit enables read-only mode without side effects |
| Wake-up Sources | CAN bus activity, LIN1/LIN2 bus activity, WAKE1/WAKE2 analog inputs with selectable 16/64 ms sampling; wake-source identification via status registers |
Pinout & Package
Package: HTSSOP32 (SOT549-1), 6.1 mm × 11 mm, 0.65 mm pitch, exposed die pad for thermal and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT (32) | Battery supply input | Primary power source for SBC; powers internal regulators and oscillator; supports ISO 7637-2/3 transient immunity |
| V1 (4) | Main regulator output | 3.3 V ±2 % supply for MCU and peripherals; current-sense and control pins (VEXCC/VEXCTRL) enable external PNP extension |
| V2 (20) | CAN transceiver regulator | Dedicated 5 V output isolated from V1; improves EMC and allows independent shutdown during low-power modes |
| RXDC (14) / TXDC (13) | CAN data interface | Digital connection to MCU's CAN controller; enables full HS-CAN protocol stack implementation without external level-shifting |
| CANH (21) / CANL (22) | CAN bus physical layer | Direct connection to vehicle CAN bus; ±58 V short-circuit proof; ±8 kV HBM ESD protected; floating in Off mode |
| RXDL1 (5) / TXDL1 (3) / LIN1 (25) | LIN1 transceiver interface | Full LIN 2.2A physical layer: LIN1 bus line, digital RX/TX to MCU; DLIN (26) provides integrated termination |
| RXDL2 (2) / TXDL2 (1) / LIN2 (27) | LIN2 transceiver interface | Independent second LIN channel with identical compliance and termination; enables dual-sensor or multi-actuator sub-bus control |
| WAKE1 (18) / WAKE2 (19) | Local wake-up inputs | Analog wake inputs with programmable sampling (16/64 ms); WBIAS (28) provides controlled bias for external switches |
| INTN (7) | Interrupt output | Open-drain signal indicating V1/V2 undervoltage, CAN/LIN/local wake events, cyclic timer expiry, or power-on reset |
| LIMP (17) | Limp-home control | Active-low output to trigger fail-safe hardware (e.g., relay, LED, buzzer) during overtemperature or critical fault conditions |
| WDOFF (16) | Watchdog disable | Hardware pin to force watchdog into Off mode; overrides SPI-configured WMC setting for safety-critical deactivation |
| SPLIT (24) | CAN common-mode stabilizer | Output used with external 47 Ω resistor to CAN ground to reduce bus reflections and improve EMC in recessive state |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-LIN + HS-CAN transceivers | Eliminates 5+ discrete ICs and passive components per ECU; reduces BOM cost and PCB area by >30% vs. discrete solution |
| Scalable 3.3 V/250 mA V1 regulator | Supports modern low-voltage MCUs; external PNP extension enables >1 A total current with distributed thermal dissipation across PCB |
| Independent V2 regulator for CAN | Decouples CAN transceiver power from MCU rail, preventing noise coupling and enabling CAN-only wake during MCU sleep |
| Programmable watchdog with window mode | Prevents runaway code execution with strict timing windows; on-chip oscillator ensures reliability even if V1/V2 are unstable |
| Multi-source wake-up with source identification | Hardware-level detection and reporting of CAN, LIN1, LIN2, WAKE1, or WAKE2 triggers via SPI-readable status flags |
| Limp-home output with overtemperature lockout | Automatically asserts LIMP (LOW) during OTP event; persists until thermal recovery, enabling fail-operational response in engine bay applications |
Applications
| Body Control Module (BCM) | Powertrain Gateway |
|---|---|
Use Scenario: Centralized control of door locks, lighting, wipers, and HVAC actuators using LIN slaves and CAN backbone communication. IC Role / Device Role / Timing Role: UJA1078ATW/3V3/WDJ acts as primary power manager and dual-bus interface, supplying 3.3 V to BCM MCU while routing CAN messages to/from powertrain and LIN commands to peripheral sensors/actuators. Use Value: Enables single-chip integration of power, CAN, and dual-LIN - reducing component count, improving startup reliability, and supporting remote firmware updates via CAN bus. |
Use Scenario: Aggregating and translating signals between engine/transmission CAN networks and chassis/safety LIN subsystems in hybrid vehicles. IC Role / Device Role / Timing Role: UJA1078ATW/3V3/WDJ serves as gateway SBC, providing isolated V2-powered CAN transceiver for high-noise powertrain bus and dual LIN interfaces for battery management and thermal control modules. Use Value: Dual independent LIN channels allow concurrent communication with multiple subsystems; V1/V2 separation prevents power noise from corrupting CAN timing integrity. |
| Advanced Driver Assistance Systems (ADAS) Sensor Hub | Electric Vehicle (EV) Battery Management Node |
Use Scenario: Consolidating radar, camera, and ultrasonic sensor data via LIN sub-buses before forwarding to central ADAS domain controller over CAN FD. IC Role / Device Role / Timing Role: UJA1078ATW/3V3/WDJ supplies regulated 3.3 V to sensor hub MCU, manages wake-up from LIN sensor alerts, and provides robust CAN interface with SPLIT stabilization for noise immunity. Use Value: Low-slope LIN mode (10.4 kbit/s) minimizes EMI near sensitive RF circuits; programmable watchdog ensures deterministic recovery from sensor data stalls. |
Use Scenario: Monitoring cell voltage, temperature, and contactor status in EV battery packs using LIN-connected sensors and reporting faults over high-speed CAN to vehicle controller. IC Role / Device Role / Timing Role: UJA1078ATW/3V3/WDJ functions as BMS node SBC, delivering stable 3.3 V to monitoring MCU, enabling LIN communication with up to 16 slave sensors, and asserting LIMP output on thermal runaway detection. Use Value: Overtemperature shutdown and persistent LIMP activation provide fail-safe response to cell thermal events; ±58 V bus tolerance withstands battery pack transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar System Basis Chip applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCV7429 | Single-LIN + HS-CAN SBC; no V2 regulator; 3.3 V/200 mA V1; no limp-home output; smaller SOIC-20 package | Suitable for cost-sensitive LIN-only nodes where CAN is primary bus and thermal fail-safe is handled externally | Select when dual-LIN is unnecessary and PCB space is constrained; verify external fault-handling for limp-home functionality |
| UJA1076ATW/3V3/WDJ | Same family but single-LIN variant; identical V1/V2 specs, watchdog, SPI, and pinout except missing LIN2-related pins (TXDL2, RXDL2, LIN2, DLIN) | Drop-in replacement for designs requiring only one LIN bus; retains full CAN, watchdog, and power management features | Choose for simplified LIN architecture; requires no PCB change if UJA1078A footprint is used, but LIN2 signals remain unconnected |
Compared with NCV7429 and UJA1076ATW/3V3/WDJ, the UJA1078ATW/3V3/WDJ uniquely delivers dual-LIN support with independent bus control, dedicated V2 regulation for CAN EMC isolation, and hardware-enforced limp-home activation - making it optimal for multi-domain gateways and safety-critical sensor hubs where redundancy and fail-operational behavior are required.
Availability
UJA1078ATW/3V3/WDJ is available at Aetrix Electronics and suitable for automotive body control modules, powertrain gateways, ADAS sensor hubs, and EV battery management nodes requiring stable component supply, long-term lifecycle support, and AEC-Q100 qualified performance.
Supply support for UJA1078ATW/3V3/WDJ 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 SoCs and system basis chips.
The UJA1078A product line is designed specifically for automotive Electronic Control Units requiring integrated power management, high-speed CAN, dual-LIN, and functional safety features - targeting body electronics, gateway systems, and electrification control units.
FAQ
What is the nominal output voltage and accuracy of the main regulator in UJA1078ATW/3V3/WDJ?
The UJA1078ATW/3V3/WDJ features a 3.3 V main regulator (V1) with ±2 % output voltage accuracy across temperature and load. This precision enables reliable operation of modern 3.3 V automotive microcontrollers without external regulation, and the regulator maintains stability down to 4.5 V VBAT during engine cranking per ISO 16750-2.
Does UJA1078ATW/3V3/WDJ support remote firmware updates over the CAN bus?
Yes, UJA1078ATW/3V3/WDJ explicitly supports remote flash programming via the CAN bus as stated in its official product data sheet. The integrated HS-CAN transceiver, combined with robust wake-up capability and controlled power sequencing, enables secure bootloader activation and firmware download without physical access to the ECU.
How does the watchdog function differ between Window and Timeout modes in UJA1078ATW/3V3/WDJ?
In Timeout mode, the UJA1078ATW/3V3/WDJ resets if no valid trigger occurs before the programmed period expires. In Window mode, it resets if a trigger occurs too early (before ttrig(wd)1) or too late (after ttrig(wd)2), enforcing strict timing boundaries - critical for safety-critical tasks where both premature and delayed responses are hazardous.
Can UJA1078ATW/3V3/WDJ operate with only the V1 regulator active while disabling the V2 regulator?
Yes, UJA1078ATW/3V3/WDJ allows V2 to be switched off via SPI configuration (MC bits = 10), enabling the internal CAN transceiver to be powered by V1 instead. This reduces quiescent current in low-power modes and simplifies power design when CAN bus activity is infrequent, though V2 must be enabled for optimal EMC performance during active CAN communication.
What protection features are implemented on the CAN and LIN bus pins of UJA1078ATW/3V3/WDJ?
The UJA1078ATW/3V3/WDJ provides ±58 V short-circuit proofing on all CANH, CANL, LIN1, LIN2, and DLIN pins; ±8 kV HBM and ±6 kV IEC 61000-4-2 ESD protection; and transient immunity per ISO 7637-3. These protections ensure robust operation in harsh automotive environments with load dump, jump-start, and inductive switching events.
UJA1078ATW/3V3/WDJ 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/3V3/WDJ FAQ
1.How can I place an order for UJA1078ATW/3V3/WDJ through Aetrix?
Please submit a Request for Quotation (RFQ) for UJA1078ATW/3V3/WDJ 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/WDJ reliable?
The price and inventory of UJA1078ATW/3V3/WDJ 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/WDJ is usually 5 days.
3.What payment methods are accepted for UJA1078ATW/3V3/WDJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UJA1078ATW/3V3/WDJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UJA1078ATW/3V3/WDJ?
UJA1078ATW/3V3/WDJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UJA1078ATW/3V3/WDJ 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/WDJ?
For technical support, including UJA1078ATW/3V3/WDJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UJA1078ATW/3V3/WDJ requirements.
6.How does Aetrix verify that UJA1078ATW/3V3/WDJ is sourced from the original manufacturer or authorized distributors?
All UJA1078ATW/3V3/WDJ 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/WDJ meets industry standards.
7.What is the process for return or replacement of UJA1078ATW/3V3/WDJ?
All UJA1078ATW/3V3/WDJ units undergo pre-shipment inspection (PSI). If there is an issue with UJA1078ATW/3V3/WDJ, 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/WDJ part is unused and in its original packaging.
Return procedure for UJA1078ATW/3V3/WDJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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