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NXP Semiconductors UJA1078TW/5V0/WD,1
- Part No.:
- UJA1078TW/5V0/WD,1
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 32-TSSOP (0.240", 6.10mm Width) Exposed Pad
- Datasheet:
-
UJA1078TW/5V0/WD,1.pdf
- Description:
- IC INTFACE SPECIALIZED 32HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,685
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Product details
Overview
UJA1078TW/5V0/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 (SAE J2602 compliant), a 5 V/250 mA microcontroller voltage regulator (V1), a dedicated 5 V CAN transceiver regulator (V2), and an advanced window/timeout watchdog - all in a single HTSSOP32 package for automotive ECU power and communication management.
For engineers reviewing the UJA1078TW/5V0/WD,1 datasheet, UJA1078TW/5V0/WD,1 pinout, UJA1078TW/5V0/WD,1 application, or UJA1078TW/5V0/WD,1 equivalent, this SBC delivers deterministic startup, bus wake-up detection (CAN/LIN/local), limp-home safety output, SPI-based diagnostics, and ISO 7637-3 transient-protected I/O - critical for body control modules, gateway ECUs, and sensor actuator nodes requiring robust automotive-grade integration.
Technical Context
The UJA1078TW/5V0/WD,1 implements a state-machine-based system controller managing Off/Standby/Normal/Sleep/Overtemp modes with programmable transitions via SPI registers (e.g., Mode_Control). Its dual-LIN physical layers support independent low-slope (10.4 kbit/s) or normal-slope (20 kbit/s) operation, while the CAN transceiver includes SPLIT pin stabilization and floating bus pins during power-off.
Power management integrates V1 (5 V ±3 %, 250 mA, external PNP extendable) and V2 (5 V, switchable, undervoltage warning at 90 %), both operating down to 4.5 V (V1) or 5.5 V (V2) during cranking per ISO 16750-2. Wake-up sources include CAN/LIN bus activity, WAKE1/WAKE2 inputs (with configurable 16/64 ms sampling), and cyclic interrupts - all reported via INTN and readable through Int_Status register bits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CAN Interface | High-speed, ISO 11898-2 & ISO 11898-5 compliant; supports bus wake-up and recessive level stabilization via SPLIT pin |
| LIN Interfaces | Dual, LIN 2.1 & SAE J2602 compliant; downward compatible with LIN 2.0/1.3; integrated termination diode at DLIN |
| V1 Regulator | 5 V output, ±3 % accuracy (LIN slave), 250 mA max, extendable with external PNP transistor for thermal distribution |
| V2 Regulator | 5 V dedicated supply for on-chip CAN transceiver; switchable; undervoltage warning at 90 % nominal |
| Watchdog | Programmable window/timeout/off modes; clocked by on-chip oscillator; default period 128 ms; WDOFF pin disables |
| SPI Interface | Full-duplex, 16-bit; supports read-only register access; SCSN active-low, SCK idle-low timing |
| Package | HTSSOP32 (SOT549-1); 6.1 mm × 11 mm; 0.65 mm pitch; exposed die pad for PCB heat dissipation |
Pinout & Package
HTSSOP32 package (SOT549-1) with 32 leads, 6.1 mm body width, 0.65 mm lead pitch, and exposed die pad thermally connected to PCB ground or left floating per design requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 (Pin 4) | Main microcontroller supply output | 5 V regulated output; powers MCU and peripherals; supports external PNP extension via VEXCTRL/VEXCC |
| V2 (Pin 20) | Dedicated CAN transceiver supply | 5 V regulator output; isolated from V1; can be disabled to reduce quiescent current |
| RSTN (Pin 6) | Bidirectional reset I/O | Drives LOW during overtemperature or power-on; configurable reset pulse length (70/10 ms) via RTHC bit |
| INTN (Pin 7) | Interrupt output | Open-drain; signals V1/V2 undervoltage, CAN/LIN/wake-up, cyclic, and power-on events individually maskable |
| WAKE1/WAKE2 (Pins 18/19) | Local wake-up inputs | Configurable sampling (16/64 ms) via WBIAS; support pull-down/pull-up biasing for switch detection |
| LIMP (Pin 17) | Limp-home safety output | Active-low; driven LOW during overtemperature or software-activated limp-home mode (LHC=1) |
| TXDC/RXDC (Pins 13/14) | CAN data interface | Connects to MCU's CAN controller; enables full-duplex CAN protocol stack implementation |
| TXDL1/RXDL1 & TXDL2/RXDL2 (Pins 1/5 & 2/3) | LIN data interfaces | Separate transmit/receive paths for LIN1 and LIN2; support master/slave roles and diagnostic frames |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-LIN + high-speed CAN | Eliminates discrete transceivers and reduces BOM count; supports mixed topology gateways with LIN sub-buses |
| Programmable watchdog with on-chip oscillator | Enables fail-safe MCU supervision independent of V1/V2 supply; prevents runaway code without external timing components |
| Two independent voltage regulators (V1/V2) | Decouples MCU and CAN transceiver power domains - improves EMC and enables selective shutdown during sleep |
| Bus wake-up detection with source identification | Allows precise root-cause analysis of wake events via WLS1/WLS2 and LWI1/LWI2 status bits in SPI registers |
| Limp-home output with overtemperature activation | Provides hardware-level fault response: LIMP pin asserts LOW automatically when chip temperature exceeds Tth(act)otp |
Applications
| Body Control Module (BCM) | Door Module ECU |
|---|---|
Use Scenario: Centralized control of lighting, windows, locks, and mirrors in passenger vehicles. IC Role / Device Role / Timing Role: Core SBC providing power (V1/V2), CAN backbone connectivity, and LIN sub-networks for door/window sensors and actuators. Use Value: Enables deterministic startup, low-power standby (<100 µA), and reliable wake-up from CAN or local switches - meeting OEM sleep current targets. | Use Scenario: Distributed module controlling power windows, side mirrors, and interior lighting per door. IC Role / Device Role / Timing Role: Local SBC delivering 5 V/250 mA to door MCU, LIN communication to mirror/window motors, and CAN gateway to BCM. Use Value: Integrated LIN transceivers eliminate external level shifters; V1's PNP extensibility handles peak motor drive currents without thermal derating. |
| Engine Bay Sensor Hub | Roof Module Gateway |
Use Scenario: Aggregation of temperature, pressure, and position sensors near engine compartment with harsh thermal environment. IC Role / Device Role / Timing Role: Robust SBC supplying MCU and sensors, monitoring CAN bus for ECU commands, and detecting local faults via overtemperature shutdown. Use Value: ±58 V short-circuit proof CAN/LIN pins and ISO 7637-3 transient protection ensure reliability under load dump and jump-start conditions. | Use Scenario: Roof-mounted module integrating sunroof, ambient lighting, and rain/light sensors communicating via LIN and CAN. IC Role / Device Role / Timing Role: Dual-LIN master coordinating multiple slave sensors; CAN interface relays status to body domain controller. Use Value: Low-slope LIN mode (10.4 kbit/s) minimizes EMI in proximity to RF-sensitive antennas; SPLIT pin stabilizes bus during intermittent connections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SBC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UJA1076TW/5V0/WD,1 | Single-LIN variant; lacks LIN2 transceiver and associated pins (RXDL2/TXDL2/DLIN/LIN2) | Suitable only for single-LIN sub-bus architectures; not drop-in for dual-LIN designs | Select when LIN2 functionality is unnecessary and PCB space/cost optimization is prioritized |
| MC33816AEKR2 | Freescale/NXP alternative with 3.3 V/200 mA VDD, single CAN, single LIN, and different SPI register map | Requires firmware adaptation for register access and interrupt handling; no LIMP output | Choose for legacy MC33816-based platforms needing second-source supply; verify watchdog and wake-up timing compatibility |
Compared with UJA1078TW/5V0/WD,1, UJA1076TW/5V0/WD,1 reduces integration depth but saves cost and footprint where dual-LIN is unused, while MC33816AEKR2 offers functional overlap in basic CAN+LIN SBC role but lacks limp-home safety, dual-LIN flexibility, and identical register-level interoperability.
Availability
UJA1078TW/5V0/WD,1 is available at Aetrix Electronics and suitable for automotive body control modules, gateway ECUs, and sensor hub applications requiring stable component supply, long-term lifecycle assurance, and AEC-Q100 qualified performance.
Supply support for UJA1078TW/5V0/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-grade analog and mixed-signal ICs.
The UJA1078TW/5V0/WD,1 belongs to NXP's System Basis Chip family, designed specifically to consolidate power management, communication interfaces, and safety features into a single AEC-Q100 qualified device for next-generation automotive ECUs.
FAQ
What is the primary function of the UJA1078TW/5V0/WD,1 in an automotive ECU?
The UJA1078TW/5V0/WD,1 serves as a core System Basis Chip that integrates high-speed CAN and dual-LIN transceivers, two independent voltage regulators (V1 = 5 V/250 mA, V2 = 5 V for CAN), an advanced watchdog, and system-level power management. It replaces discrete components in automotive ECUs to ensure controlled startup, low-power operation, bus wake-up detection, and safety-critical limp-home response - all within a single HTSSOP32 package.
Does the UJA1078TW/5V0/WD,1 support both LIN 2.1 and legacy LIN protocols?
Yes, the UJA1078TW/5V0/WD,1 includes two fully compliant LIN 2.1 transceivers that are also backward compatible with LIN 2.0 and LIN 1.3, and meet SAE J2602 requirements. This ensures interoperability across generations of LIN slave devices in automotive networks, including body electronics and comfort systems using the UJA1078TW/5V0/WD,1 as master node.
How does the watchdog feature operate in the UJA1078TW/5V0/WD,1?
The UJA1078TW/5V0/WD,1 implements a programmable watchdog with Window, Timeout, and Off modes, clocked by an on-chip oscillator independent of V1/V2 supplies. Its period is set via NWP bits (8 ms to 4096 ms) in the WD_and_Status register. A write to this register resets the timer; in Window mode, triggering outside the valid window causes immediate reset - ensuring robust MCU supervision in the UJA1078TW/5V0/WD,1.
Can the UJA1078TW/5V0/WD,1 operate during automotive cranking conditions?
Yes, the UJA1078TW/5V0/WD,1 is designed for automotive cranking: V1 regulator operates down to 4.5 V (per ISO 16750-2 Pulse 4b), and V2 operates down to 5.5 V (per ISO 7637-3 Pulse 4). Both regulators maintain stable output and provide undervoltage warnings at 90 % of nominal voltage - enabling reliable ECU operation during battery voltage sag, a key requirement for UJA1078TW/5V0/WD,1 deployment in start-stop systems.
What safety mechanisms does the UJA1078TW/5V0/WD,1 provide for critical automotive functions?
The UJA1078TW/5V0/WD,1 includes overtemperature shutdown with automatic LIMP output assertion (driven LOW), bidirectional RSTN with configurable reset threshold (90 % or 70 % V1), and a global enable output (EN) for controlling external safety hardware. These features ensure fail-safe behavior during thermal faults, power anomalies, or MCU lockup - directly supporting ASIL-B–relevant subsystems when used with appropriate system-level redundancy in the UJA1078TW/5V0/WD,1.
UJA1078TW/5V0/WD,1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 32-TSSOP (0.240", 6.10mm Width) Exposed Pad
- Packaging:
- Tube
- 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/5V0/WD,1 FAQ
1.How can I place an order for UJA1078TW/5V0/WD,1 through Aetrix?
Please submit a Request for Quotation (RFQ) for UJA1078TW/5V0/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/5V0/WD,1 reliable?
The price and inventory of UJA1078TW/5V0/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/5V0/WD,1 is usually 5 days.
3.What payment methods are accepted for UJA1078TW/5V0/WD,1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UJA1078TW/5V0/WD,1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UJA1078TW/5V0/WD,1?
UJA1078TW/5V0/WD,1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UJA1078TW/5V0/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/5V0/WD,1?
For technical support, including UJA1078TW/5V0/WD,1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UJA1078TW/5V0/WD,1 requirements.
6.How does Aetrix verify that UJA1078TW/5V0/WD,1 is sourced from the original manufacturer or authorized distributors?
All UJA1078TW/5V0/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/5V0/WD,1 meets industry standards.
7.What is the process for return or replacement of UJA1078TW/5V0/WD,1?
All UJA1078TW/5V0/WD,1 units undergo pre-shipment inspection (PSI). If there is an issue with UJA1078TW/5V0/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/5V0/WD,1 part is unused and in its original packaging.
Return procedure for UJA1078TW/5V0/WD,1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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