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NXP Semiconductors UJA1078ATW/5V0WD,1
- Part No.:
- UJA1078ATW/5V0WD,1
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 32-TSSOP (0.240", 6.10mm Width) Exposed Pad
- Datasheet:
-
UJA1078ATW/5V0WD,1.pdf
- Description:
- IC INTFACE SPECIALIZED 32HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,790
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Product details
Overview
UJA1078ATW/5V0WD,1 from NXP Semiconductors is a high-speed CAN/dual LIN core System Basis Chip (SBC) integrating a 5 V/250 mA microcontroller 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, advanced watchdog, and limp home output - deployed in automotive ECUs for powertrain and body control modules.
For engineers reviewing the UJA1078ATW/5V0WD,1 datasheet, UJA1078ATW/5V0WD,1 pinout, UJA1078ATW/5V0WD,1 application, or UJA1078ATW/5V0WD,1 equivalent, this SBC delivers deterministic system startup, bus-level wake-up detection (CAN/LIN/local), thermal shutdown protection, and remote flash programming support via CAN - critical for ASIL-B–compatible ECU designs requiring robust power management and fault reporting.
Technical Context
The UJA1078ATW/5V0WD,1 implements a state-machine-based system controller managing Off/Standby/Normal/Sleep/Overtemp modes with programmable transitions, supported by independent V1 (5 V ±2 %) and V2 (5 V) regulators, each with undervoltage warning/reset thresholds and cranking operation down to 4.5 V (V1) or 5.5 V (V2).
Its dual-LIN architecture supports full backward compatibility from LIN 1.0 through LIN 2.2A and SAE J2602, with low-slope mode for EMC optimization and integrated termination diode at DLIN; the HS-CAN transceiver features SPLIT output for recessive bus stabilization and ±58 V short-circuit proof bus pins compliant with ISO 7637-3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Output Voltage | 5.0 V ±2 % - powers microcontroller and peripherals; stable during cranking (VBAT ≥ 4.5 V) |
| V1 Max Current | 250 mA - extendable with external PNP transistor for thermal distribution across PCB |
| V2 Output Voltage | 5.0 V - dedicated supply for on-chip HS-CAN transceiver; switchable off to reduce quiescent current |
| CAN Compliance | ISO 11898-2:2003 & ISO 11898-5:2006 - interoperable with TJA1042; supports up to 1 Mbps data rate |
| LIN Compliance | LIN 2.2A & SAE J2602 - backward compatible to LIN 1.0; includes low-slope mode for improved EMC |
| Watchdog Type | Window/Timeout/Off modes - clocked by on-chip oscillator; default period 128 ms; WDOFF pin disables it |
| Package | HTSSOP32 (SOT549-1) - 6.1 mm × 11 mm, 0.65 mm pitch, exposed die pad for thermal dissipation |
Pinout & Package
HTSSOP32 package with exposed thermal pad; 32-pin lead frame optimized for automotive ECU board layout and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT (32) | Battery input | Primary supply input (4.5–27 V); powers all internal regulators and logic |
| V1 (4) | Main regulator output | 5 V ±2 % output delivering up to 250 mA to MCU and peripherals |
| V2 (20) | CAN transceiver regulator | Dedicated 5 V supply for HS-CAN transceiver; can be disabled to save power |
| RXDC (14) / TXDC (13) | CAN data interface | CMOS-level digital interface between MCU CAN controller and internal transceiver |
| CANH (21) / CANL (22) | CAN bus physical layer | Differential HS-CAN bus connection; ±58 V short-circuit proof; ISO 7637-3 transient protected |
| RXDL1 (5) / TXDL1 (3) / LIN1 (25) | LIN1 interface | Digital LIN1 data path + bus line; supports LIN 2.2A with integrated termination diode at DLIN (26) |
| RXDL2 (2) / TXDL2 (1) / LIN2 (27) | LIN2 interface | Independent second LIN channel; identical functionality and compliance to LIN1 |
| WAKE1 (18) / WAKE2 (19) | Local wake-up inputs | Analog wake-up detection with configurable sampling (16 ms or 64 ms); bias controlled by WBIAS (28) |
| INTN (7) | Interrupt output | Open-drain signal indicating V1/V2 undervoltage, CAN/LIN/wake-up events, or power-on condition |
| RSTN (6) | Bidirectional reset | Active-low reset I/O with programmable pulse width; supports multiple MCU reset timing requirements |
| LIMP (17) | Limp home control | Active-low output to activate fail-safe hardware during critical system faults (e.g., overtemperature) |
| SPI (SDI/SDO/SCK/SCSN) | Configuration interface | Full-duplex 16-bit SPI for register access, diagnostics, and real-time status reporting |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-LIN + HS-CAN transceivers | Reduces BOM count by replacing 3 discrete transceivers and associated protection components |
| Programmable watchdog with window mode | Enables safe MCU supervision with time-bound response windows - critical for ASIL-B functional safety |
| Separate V1/V2 regulators with undervoltage monitoring | Allows independent fault detection and recovery for MCU domain and CAN physical layer |
| Remote flash programming via CAN | Supports OTA updates without LIN or debug interface - reduces service tool dependency |
| Limp home output with overtemperature activation | Automatically triggers fail-safe behavior when chip temperature exceeds Tth(act)otp, ensuring system integrity |
| Low-power Standby/Sleep modes with full wake-up capability | Achieves sub-100 µA sleep current while retaining CAN/LIN/local wake-up detection - meets OEM quiescent current targets |
Applications
| Powertrain Control Unit | Body Control Module |
|---|---|
|
Use Scenario: ECU managing engine sensors, actuators, and emissions systems in ICE or hybrid vehicles. IC Role / Device Role / Timing Role: Core SBC providing regulated power (V1/V2), HS-CAN communication backbone, and LIN sub-bus for throttle position, knock sensor, and coolant temperature modules. Use Value: Enables cranking-compatible operation (VBAT ≥ 4.5 V), ISO 7637-3 transient immunity, and deterministic startup sequencing - essential for ASIL-B powertrain applications. |
Use Scenario: Centralized vehicle body electronics controlling lighting, door locks, mirrors, and HVAC. IC Role / Device Role / Timing Role: System basis chip supplying MCU, hosting dual LIN networks for seat/mirror control and lighting modules, and enabling CAN gateway functions. Use Value: Dual LIN 2.2A channels eliminate need for separate LIN transceivers; LIMP output activates fail-safe lighting or door lock retention during thermal fault. |
| Advanced Driver Assistance Systems | Electric Vehicle Battery Management |
|
Use Scenario: Radar or camera ECU requiring reliable wake-up from low-power states and robust EMC performance. IC Role / Device Role / Timing Role: Power manager and communication hub - supplies vision processor, handles CAN diagnostics, and detects LIN-based proximity sensor activity. Use Value: Low-slope LIN mode and enhanced EMC design meet CISPR 25 Class 5 radiated emission limits; local wake-up pins enable ultra-low-current standby. |
Use Scenario: BMS slave node communicating with master via CAN while interfacing with cell voltage monitors via LIN. IC Role / Device Role / Timing Role: SBC powering BMS microcontroller, isolating CAN traffic from LIN sensor network, and reporting overtemperature events via INTN and LIMP. Use Value: Overtemperature shutdown and limp home output prevent unsafe battery operation; V1/V2 separation avoids coupling noise from CAN transceiver into analog sensing domain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar core SBC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TJA1044T/3 | Single HS-CAN transceiver only; no LIN, no regulators, no watchdog - requires external power IC and microcontroller interface logic | Lacks integrated dual-LIN, V1/V2 regulation, and system-level supervision - suitable only for simple CAN nodes without subsystem integration needs | Select when only CAN physical layer is required and full SBC functionality is unnecessary or implemented elsewhere |
| UJA1169ATW/5V0 | Includes 5 V/300 mA V1 regulator, LIN 2.2A, HS-CAN, but omits watchdog and limp home output; different SPI register map and mode control | No window-mode watchdog or LIMP activation - not suitable for ASIL-B applications requiring fail-safe hardware activation | Choose for cost-sensitive body electronics where watchdog supervision and limp home are not mandated |
Compared with TJA1044T/3 and UJA1169ATW/5V0, the UJA1078ATW/5V0WD,1 uniquely combines dual-LIN, 5 V V1/V2 regulation, window watchdog, and limp home output in one HTSSOP32 package - making it the only option among the three that satisfies full ASIL-B ECU power and communication requirements without external supplementation.
Availability
UJA1078ATW/5V0WD,1 is available at Aetrix Electronics and suitable for automotive powertrain control units, body control modules, ADAS radar ECUs, and EV battery management slave nodes requiring stable component supply, long-term lifecycle assurance, and AEC-Q100 Grade 1 qualification.
Supply support for UJA1078ATW/5V0WD,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 mixed-signal ICs and functional safety architectures.
The UJA1078ATW/5V0WD,1 belongs to NXP's System Basis Chip product line, designed specifically for automotive ECU consolidation - integrating power, communication, and supervision functions to replace discrete implementations while meeting ISO 26262 ASIL-B requirements.
FAQ
What is the nominal output voltage of the main regulator (V1) in UJA1078ATW/5V0WD,1?
The UJA1078ATW/5V0WD,1 features a 5.0 V ±2 % main regulator (V1) optimized for microcontroller and peripheral supply. This voltage is fixed per part number suffix "/5" and remains stable down to VBAT = 4.5 V during engine cranking, complying with ISO 16750-2. The UJA1078ATW/5V0WD,1 does not support adjustable V1 output - only 3.3 V and 5 V variants exist within the UJA1078A family.
Does UJA1078ATW/5V0WD,1 support remote firmware updates via CAN bus?
Yes, the UJA1078ATW/5V0WD,1 supports remote flash programming via the HS-CAN interface. Its integrated system controller and SPI-configurable registers allow the host microcontroller to initiate and manage bootloader operations over CAN without requiring LIN or physical debug access. This capability is explicitly documented in Section 2.1 of the datasheet and enables over-the-air updates in production vehicles.
How does the watchdog function differ in UJA1078ATW/5V0WD,1 compared to non-W variants?
The "W" suffix in UJA1078ATW/5V0WD,1 denotes inclusion of an advanced independent watchdog with Window, Timeout, and Off modes - clocked by an on-chip oscillator. Non-W variants (e.g., UJA1078ATW/5) omit this feature entirely. The UJA1078ATW/5V0WD,1 watchdog supports programmable periods (8 ms to 4096 ms), cyclic wake-up, and automatic re-enable after interrupt - enabling ASIL-B–compliant supervision not available in base variants.
What is the purpose of the LIMP output pin on UJA1078ATW/5V0WD,1?
The LIMP pin (Pin 17) on UJA1078ATW/5V0WD,1 is an active-low output that drives LOW during critical system faults - including overtemperature shutdown, V1/V2 undervoltage, or watchdog timeout - to activate application-specific fail-safe hardware. It is directly controlled by the LHC bit in the Mode_Control register and provides deterministic hardware-level response independent of MCU software state, fulfilling ASIL-B limp-home requirements.
Can UJA1078ATW/5V0WD,1 operate with VBAT below 5.5 V in Sleep mode?
Yes, UJA1078ATW/5V0WD,1 maintains full Sleep mode functionality down to VBAT = 4.5 V, as confirmed by its V1 regulator specification (Section 2.6.1). While V2 regulator operation requires VBAT ≥ 5.5 V, Sleep mode disables V2 entirely - allowing ultra-low-current operation (<100 µA) even during extended battery drain scenarios. This behavior is validated per ISO 7637-2 Pulse 4 and ISO 16750-2 cold-cranking profiles.
UJA1078ATW/5V0WD,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:
- 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/5V0WD,1 FAQ
1.How can I place an order for UJA1078ATW/5V0WD,1 through Aetrix?
Please submit a Request for Quotation (RFQ) for UJA1078ATW/5V0WD,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 UJA1078ATW/5V0WD,1 reliable?
The price and inventory of UJA1078ATW/5V0WD,1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UJA1078ATW/5V0WD,1 is usually 5 days.
3.What payment methods are accepted for UJA1078ATW/5V0WD,1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UJA1078ATW/5V0WD,1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UJA1078ATW/5V0WD,1?
UJA1078ATW/5V0WD,1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UJA1078ATW/5V0WD,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 UJA1078ATW/5V0WD,1?
For technical support, including UJA1078ATW/5V0WD,1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UJA1078ATW/5V0WD,1 requirements.
6.How does Aetrix verify that UJA1078ATW/5V0WD,1 is sourced from the original manufacturer or authorized distributors?
All UJA1078ATW/5V0WD,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 UJA1078ATW/5V0WD,1 meets industry standards.
7.What is the process for return or replacement of UJA1078ATW/5V0WD,1?
All UJA1078ATW/5V0WD,1 units undergo pre-shipment inspection (PSI). If there is an issue with UJA1078ATW/5V0WD,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 UJA1078ATW/5V0WD,1 part is unused and in its original packaging.
Return procedure for UJA1078ATW/5V0WD,1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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