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NXP Semiconductors UJA1079ATW/5V0WD,1
- Part No.:
- UJA1079ATW/5V0WD,1
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 32-TSSOP (0.240", 6.10mm Width) Exposed Pad
- Datasheet:
-
UJA1079ATW/5V0WD,1.pdf
- Description:
- IC INTFACE SPECIALIZED 32HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,120
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Product details
Overview
UJA1079ATW/5V0WD,1 from NXP Semiconductors is a LIN core System Basis Chip (SBC) integrating a LIN 2.2A/SAE J2602 transceiver, 5 V ±2 % voltage regulator delivering up to 250 mA, advanced independent watchdog with Window/Timeout/Off modes, full-duplex SPI interface, and dual local wake-up inputs - designed for automotive ECU power management and communication control in body electronics modules.
For engineers reviewing the UJA1079ATW/5V0WD,1 datasheet, UJA1079ATW/5V0WD,1 pinout, UJA1079ATW/5V0WD,1 application, or UJA1079ATW/5V0WD,1 equivalent, key selection considerations include LIN bus fault tolerance (±58 V short-circuit proof), ISO 7637-3 transient protection, 6.1 mm × 11 mm HTSSOP32 thermal performance, wake-up source detection capability, and limp home output activation under system failure.
Technical Context
The UJA1079ATW/5V0WD,1 implements a state-machine-based system controller managing Off/Standby/Normal/Sleep/Overtemp mode transitions triggered by VBAT thresholds, wake events, or temperature conditions. Its LIN transceiver supports low-slope mode (10.4 kbit/s) for EMC optimization and includes integrated termination diode at DLIN.
Power management integrates V1 regulation with external PNP transistor support (VEXCTRL/VEXCC pins), programmable current threshold switching (50/85 mA activation/deactivation), and dual wake-up sampling (16 ms or 64 ms via WBIAS). The watchdog uses an on-chip oscillator independent of V1 and supports cyclic interrupt generation in Timeout mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LIN Compliance | LIN 2.2A and SAE J2602 compliant; backward compatible to LIN 1.0–2.2; enables interoperability with legacy and modern LIN networks. |
| V1 Regulator Output | 5 V ±2 % accuracy; delivers up to 250 mA; operates down to 4.5 V VBAT (cranking); supports external PNP for thermal load sharing. |
| Watchdog Modes | Window, Timeout, and Off modes; configurable via WD_and_Status register; default period 128 ms; independent on-chip oscillator clock source. |
| SPI Interface | 16-bit full-duplex SPI; supports read-only register access; uses SCSN/SCK/SDI/SDO signals; falling-edge sampling, rising-edge shifting. |
| Wake-up Inputs | Two analog inputs (WAKE1/WAKE2); configurable edge-triggered interrupts; bias control via WBIAS with selectable 16 ms or 64 ms sampling. |
| Protection Ratings | ±58 V short-circuit proof LIN pin; ±8 kV HBM ESD; ±6 kV IEC 61000-4-2 ESD; ISO 7637-3 transient protection on LIN and wake-up pins. |
| Thermal Package | HTSSOP32 (SOT549-1); 6.1 mm × 11 mm body; exposed die pad; low thermal resistance for automotive under-hood operation. |
Pinout & Package
Package: HTSSOP32 (SOT549-1), plastic thermal enhanced thin shrink small outline package; 32 leads; 0.65 mm pitch; 6.1 mm body width; exposed die pad recommended for soldering to PCB ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT (Pin 32) | Battery supply input | Primary power source for SBC; supports operation down to 4.5 V during cranking per ISO 16750-2. |
| V1 (Pin 4) | Regulated output | 5 V ±2 % supply for microcontroller and peripherals; undervoltage warning at 90 %, reset at 90 % or 70 % nominal. |
| LIN (Pin 25) | LIN bus interface | Analog bidirectional LIN physical layer connection; ±58 V short-circuit protected; ISO 7637-3 transient hardened. |
| RXDL (Pin 5) | LIN receive data output | Digital output carrying decoded LIN bus data to microcontroller; active in Lowpower/Active LIN modes. |
| TXDL (Pin 3) | LIN transmit data input | Digital input accepting microcontroller's LIN frame data; drives LIN bus via internal driver stage. |
| WAKE1 / WAKE2 (Pins 18, 19) | Local wake-up inputs | Analog wake sources with programmable edge detection; sampling synchronized to WBIAS for ultra-low standby current. |
| WBIAS (Pin 28) | Wake bias control | Output controlling external wake-up bias transistor; sets 16 ms or 64 ms sampling interval for WAKE1/WAKE2. |
| INTN (Pin 7) | Interrupt output | Open-drain output signaling V1 undervoltage, LIN/wake-up events, or cyclic interrupts to microcontroller. |
| RSTN (Pin 6) | Bidirectional reset | Microcontroller-initiated reset (input) or SBC-generated reset pulse (output); length configurable via external pull-up. |
| LIMP (Pin 17) | Limp home output | Fail-safe active-low output activating safety hardware during Overtemp or critical failure; controlled via LHC bit. |
| SDI / SDO / SCK / SCSN (Pins 9, 10, 11, 12) | SPI interface | Full-duplex serial control path; enables configuration, status readback, and diagnostics without disrupting LIN operation. |
| VEXCTRL / VEXCC (Pins 31, 29) | External PNP control | VEXCTRL drives base of external PNP; VEXCC measures collector current to enable precise current-threshold switching. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LIN Transceiver | LIN 2.2A/SAE J2602 compliance with low-slope mode reduces radiated emissions and improves EMC robustness in noisy automotive environments. |
| Scalable 5 V Regulator | ±2 % output accuracy and 250 mA capability ensure stable MCU supply across battery transients; external PNP extension avoids thermal hotspots on PCB. |
| Advanced Watchdog | Independent on-chip oscillator enables reliable timing even during V1 brownout; Window mode prevents premature resets while detecting software hangs. |
| Intelligent Wake-up Architecture | Dual wake-up inputs with configurable sampling intervals and bias control reduce quiescent current below 10 µA in Standby mode. |
| Fail-Safe Limp Home Output | LIMP pin asserts LOW during Overtemp or critical faults, enabling immediate activation of mechanical fallback systems without MCU intervention. |
| Comprehensive Diagnostics | SPI-accessible registers report V1 status, wake-up source, interrupt flags, and watchdog state - enabling predictive maintenance and error logging. |
Applications
| Body Control Module (BCM) | Seat Control Unit |
|---|---|
|
Use Scenario: Centralized control of door locks, window lifts, mirrors, and interior lighting in passenger vehicles. IC Role / Device Role / Timing Role: UJA1079ATW/5V0WD,1 serves as primary power manager and LIN interface, regulating MCU supply and handling LIN bus arbitration and wake-up from sleep. Use Value: Enables <10 µA standby current with full wake-up capability, meeting OEM requirements for low-power vehicle-off states while maintaining fast response to door handle or key fob signals. |
Use Scenario: Motorized seat position adjustment with memory presets and heating control. IC Role / Device Role / Timing Role: UJA1079ATW/5V0WD,1 provides regulated 5 V power to seat MCU, monitors LIN commands for position/heat settings, and triggers limp home output if motor stall or overtemperature occurs. Use Value: Integrated ±58 V LIN bus protection prevents damage from load dump events during seat motor actuation; LIMP output directly disables motor drivers and activates thermal cutoffs. |
| Roof Module (Sunroof/Blind Control) | Trunk/Liftgate Actuator |
|
Use Scenario: Sunroof open/close, tilt, and anti-pinch functionality coordinated via LIN network. IC Role / Device Role / Timing Role: UJA1079ATW/5V0WD,1 manages MCU power, detects LIN wake-up commands, and generates interrupt-driven responses to sunroof position sensors and obstruction signals. Use Value: SPI-configurable wake-up edge detection (rising/falling/both) allows precise synchronization with Hall-effect sensor pulses, eliminating false triggers during slow sunroof movement. |
Use Scenario: Power-operated liftgate with obstacle detection, soft-close, and hands-free kick-sensor interface. IC Role / Device Role / Timing Role: UJA1079ATW/5V0WD,1 supplies 5 V to liftgate MCU, handles LIN commands from body domain, and asserts LIMP output upon motor current overload or thermal shutdown. Use Value: Undervoltage reset at 70 % V1 threshold ensures clean MCU restart during battery sag caused by simultaneous liftgate and HVAC operation - preventing firmware lockup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LIN SBC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UJA1076ATW/5V0WD,1 | Single wake-up input (WAKE1 only); no LIMP output; identical LIN transceiver and 5 V regulator specs. | Lacks dual-wake capability and fail-safe limp home activation; suitable for cost-sensitive single-sensor nodes. | Select UJA1076ATW/5V0WD,1 only when dual wake-up and limp home are not required - reduces BOM count but sacrifices redundancy. |
| TLE9471-3ES | Includes CAN FD interface alongside LIN; higher V1 current (350 mA); different SPI register map and watchdog configuration logic. | Targets mixed-network ECUs requiring both LIN and CAN FD; larger TQFP48 package increases PCB footprint. | Choose TLE9471-3ES when CAN FD coexistence is needed; otherwise, UJA1079ATW/5V0WD,1 offers superior thermal efficiency and LIN-specific optimization in HTSSOP32. |
Compared with UJA1076ATW/5V0WD,1, the UJA1079ATW/5V0WD,1 adds critical dual-wake support and limp home safety; versus TLE9471-3ES, it delivers lower thermal resistance and simpler SPI diagnostics for LIN-only designs - making it optimal for space-constrained, thermally demanding body electronics.
Availability
UJA1079ATW/5V0WD,1 is available at Aetrix Electronics and suitable for automotive body electronics, seat control units, and roof module designs requiring stable component supply, long-term lifecycle assurance, and AEC-Q100 qualified performance.
Supply support for UJA1079ATW/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 power management and communication ICs.
The UJA1079ATW/5V0WD,1 belongs to NXP's LIN System Basis Chip product line, engineered specifically for automotive ECU consolidation - reducing discrete component count while enhancing reliability, thermal efficiency, and functional safety in body electronics subsystems.
FAQ
What LIN protocol versions does the UJA1079ATW/5V0WD,1 support?
The UJA1079ATW/5V0WD,1 supports LIN 2.2A and SAE J2602 as primary standards, with full backward compatibility to LIN 2.2, LIN 2.1, LIN 2.0, and LIN 1.0–1.3. This ensures seamless integration into legacy and next-generation LIN networks without protocol translation layers or firmware updates.
How does the UJA1079ATW/5V0WD,1 manage thermal dissipation for its 5 V regulator?
The UJA1079ATW/5V0WD,1 uses an external PNP transistor controlled via VEXCTRL and monitored via VEXCC to share current load and distribute heat across the PCB. Its HTSSOP32 package features an exposed die pad that must be soldered to ground for optimal thermal conduction - enabling continuous 250 mA operation at junction temperatures up to 150 °C.
Can the UJA1079ATW/5V0WD,1 operate during automotive cranking conditions?
Yes, the UJA1079ATW/5V0WD,1 maintains stable 5 V output down to 4.5 V VBAT, complying with ISO 16750-2 cranking profiles. Its V1 regulator remains active and delivers full 250 mA during voltage sags, and its undervoltage reset threshold can be configured to 70 % of nominal to prevent spurious resets during extended cranking events.
What is the function of the LIMP output on the UJA1079ATW/5V0WD,1?
The LIMP output on the UJA1079ATW/5V0WD,1 is a fail-safe active-low signal that asserts LOW during Overtemperature Protection (OTP) activation or critical system faults. It directly controls external safety hardware - such as motor disable circuits or thermal cutoff relays - independent of MCU firmware execution, ensuring deterministic behavior under fault conditions.
Does the UJA1079ATW/5V0WD,1 require external components for basic LIN transceiver operation?
No external components are required for basic LIN transceiver operation beyond the mandatory 1 kΩ pull-up resistor on the LIN bus line and standard decoupling capacitors on V1 and BAT. The UJA1079ATW/5V0WD,1 integrates the LIN termination diode at DLIN and supports low-slope mode internally - eliminating need for external slew-rate control components.
How is wake-up source detection implemented in the UJA1079ATW/5V0WD,1?
Wake-up source detection in the UJA1079ATW/5V0WD,1 is performed via dedicated WAKE1 and WAKE2 analog inputs with programmable edge sensitivity (rising/falling/both) and synchronized sampling using WBIAS. Status bits WLS1/WLS2 in the WD_and_Status register identify which input triggered wake-up, enabling precise root-cause diagnostics in Standby mode.
UJA1079ATW/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:
- SPI Serial
- Voltage - Supply:
- 4.5V ~ 28V
- Supplier Device Package:
- 32-HTSSOP
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
UJA1079ATW/5V0WD,1 FAQ
1.How can I place an order for UJA1079ATW/5V0WD,1 through Aetrix?
Please submit a Request for Quotation (RFQ) for UJA1079ATW/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 UJA1079ATW/5V0WD,1 reliable?
The price and inventory of UJA1079ATW/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 UJA1079ATW/5V0WD,1 is usually 5 days.
3.What payment methods are accepted for UJA1079ATW/5V0WD,1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UJA1079ATW/5V0WD,1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UJA1079ATW/5V0WD,1?
UJA1079ATW/5V0WD,1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UJA1079ATW/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 UJA1079ATW/5V0WD,1?
For technical support, including UJA1079ATW/5V0WD,1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UJA1079ATW/5V0WD,1 requirements.
6.How does Aetrix verify that UJA1079ATW/5V0WD,1 is sourced from the original manufacturer or authorized distributors?
All UJA1079ATW/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 UJA1079ATW/5V0WD,1 meets industry standards.
7.What is the process for return or replacement of UJA1079ATW/5V0WD,1?
All UJA1079ATW/5V0WD,1 units undergo pre-shipment inspection (PSI). If there is an issue with UJA1079ATW/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 UJA1079ATW/5V0WD,1 part is unused and in its original packaging.
Return procedure for UJA1079ATW/5V0WD,1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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