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NXP Semiconductors UJA1079TW/5V0/WD,1
- Part No.:
- UJA1079TW/5V0/WD,1
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 32-TSSOP (0.240", 6.10mm Width) Exposed Pad
- Datasheet:
-
UJA1079TW/5V0/WD,1.pdf
- Description:
- IC INTFACE SPECIALIZED 32HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,263
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Product details
Overview
UJA1079TW/5V0/WD from NXP Semiconductors is a LIN 2.1–compliant System Basis Chip (SBC) integrating a 5 V/250 mA voltage regulator, advanced window/timeout watchdog with on-chip oscillator, LIN transceiver, SPI interface, two local wake-up inputs, and limp-home output - designed for automotive ECU power management and communication control in body electronics and sensor modules.
For engineers reviewing the UJA1079TW/5V0/WD datasheet, UJA1079TW/5V0/WD pinout, UJA1079TW/5V0/WD application, or UJA1079TW/5V0/WD equivalent, this page delivers verified technical context, validated pin functions, automotive-grade EMC/ESD specs, thermal-aware package details, and real-world substitution guidance for LIN-based ECU designs.
Technical Context
The UJA1079TW/5V0/WD implements a state-machine–driven system controller managing Off/Standby/Normal/Sleep/Overtemp modes with deterministic transitions triggered by VBAT thresholds, LIN bus activity, local wake events, or temperature faults. Its LIN transceiver supports low-slope mode (10.4 kbit/s) for optimized EMC and includes integrated termination diode at DLIN.
Voltage regulation uses a scalable 5 V LDO delivering up to 250 mA with ±2 % accuracy for LIN master operation and undervoltage warning/reset at 90 % or 70 % of nominal output. The watchdog operates independently via on-chip oscillator and supports programmable periods (8–4096 ms), Window/Timeout/Off modes, and automatic re-enable on interrupt.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LIN Compliance | LIN 2.1, SAE J2602, backward-compatible with LIN 2.0 and LIN 1.3 - ensures interoperability across automotive LIN networks. |
| Voltage Regulator Output | 5 V ±2 % (master), ±3 % (slave); 250 mA max - powers MCU and peripherals while supporting external PNP extension for thermal distribution. |
| Watchdog Modes | Window, Timeout, Off - enables fail-safe timing supervision with programmable period (8–4096 ms) and independent oscillator clock source. |
| SPI Interface | 16-bit full-duplex, register-mapped (WD_and_Status, Mode_Control, Int_Control, Int_Status) - enables configuration, status reporting, and diagnostics without MCU reset dependency. |
| Wake-Up Capability | Two dedicated WAKE1/WAKE2 inputs + LIN bus wake-up - supports low-power standby with configurable sampling (16/64 ms) and wake-source detection. |
| Thermal & Protection | ±8 kV HBM ESD on LIN/wake pins; ±6 kV IEC 61000-4-2; ±58 V short-circuit proof LIN; ISO 7637-3 transient protection - meets automotive robustness requirements. |
| Package | HTSSOP32 (SOT549-1); 6.1 mm × 11 mm; 0.65 mm pitch; exposed die pad - enables high-power dissipation in compact ECU layouts. |
Pinout & Package
UJA1079TW/5V0/WD uses a 32-pin HTSSOP package (SOT549-1) with exposed die pad for enhanced thermal performance. The package is RoHS-compliant, Pb-free, and dark green certified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT (Pin 32) | Battery supply input | Accepts 4.5–27 V input; supports cranking (ISO 7637 pulse 4/4b); powers internal regulators and LIN transceiver. |
| V1 (Pin 4) | Regulated output | 5 V ±2 % output supplying microcontroller and peripherals; undervoltage warning/reset at 90 % or 70 % threshold. |
| LIN (Pin 25) | LIN bus line | Direct connection to LIN physical bus; supports active/low-power modes with wake-up detection enabled. |
| WAKE1 / WAKE2 (Pins 18, 19) | Local wake-up inputs | Dedicated digital inputs for external switch wake-up; support edge-triggered interrupts and bias control via WBIAS (Pin 28). |
| RSTN (Pin 6) | Bidirectional reset | Drives LOW during internal reset (e.g., V1 UV, watchdog overflow); accepts external LOW pulse for forced reset; reset width selectable. |
| INTN (Pin 7) | Interrupt output | Open-drain signal indicating pending events: V1 undervoltage, LIN/local wake-up, cyclic interrupt, or power-on status. |
| LIMP (Pin 17) | Limp-home output | Fail-safe active-LOW output activated during overtemperature or critical fault - triggers hardware fallback behavior. |
| SDI/SDO/SCK/SCSN (Pins 9–12) | SPI interface | Full-duplex 16-bit SPI for register read/write; supports read-only access to preserve status during diagnostics. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LIN Transceiver | LIN 2.1 compliant with low-slope mode (10.4 kbit/s) and integrated DLIN termination diode - reduces external component count and improves EMC margin. |
| Scalable Power Regulation | 5 V/250 mA regulator with external PNP extension capability and programmable current thresholds (50/85 mA activation) - enables thermal load sharing across PCB. |
| Advanced Watchdog | Independent on-chip oscillator clocking; Window/Timeout/Off modes; software-initiated reset; WDOFF pin deactivation - eliminates reliance on MCU clock stability. |
| Multi-Source Wake-Up | Simultaneous LIN bus activity, WAKE1/WAKE2 edge detection, and cyclic wake-up - ensures reliable entry from ultra-low-power Sleep mode (< 100 µA). |
| Fail-Safe Outputs | Dedicated EN (global enable) and LIMP (limp-home) outputs - provide hardware-level safety control independent of MCU firmware state. |
Applications
| Body Control Module (BCM) | Seat Position Sensor Node |
|---|---|
|
Use Scenario: Centralized control of door locks, windows, mirrors, and interior lighting using LIN sub-networks. IC Role / Device Role / Timing Role: UJA1079TW/5V0/WD serves as primary power manager and LIN interface - regulating MCU supply, supervising startup, and enabling bus wake-up. Use Value: Reduces discrete BOM count by integrating regulator, watchdog, and LIN transceiver; supports <100 µA Sleep mode current for battery-sensitive applications. |
Use Scenario: Distributed seat position sensing with LIN communication to main ECU for memory seat functions. IC Role / Device Role / Timing Role: UJA1079TW/5V0/WD powers Hall-effect sensors and MCU, detects local switch wake-up, and maintains LIN bus readiness. Use Value: Enables fast (<100 µs) wake-up response from Sleep mode via WAKE1/WAKE2; ±8 kV HBM ESD protects against connector handling damage. |
| Roof Module (Sunroof/Blind Control) | Climate Control Actuator |
|
Use Scenario: LIN-connected sunroof motor driver with position feedback and obstruction detection. IC Role / Device Role / Timing Role: UJA1079TW/5V0/WD supplies motor driver MCU, monitors V1 for undervoltage during motor stall, and asserts LIMP on overtemperature. Use Value: Overtemperature shutdown and LIMP output activate mechanical fallback (e.g., partial sunroof closure) - satisfies ASIL-B functional safety expectations. |
Use Scenario: HVAC blend door actuator node communicating temperature setpoints and position status over LIN. IC Role / Device Role / Timing Role: UJA1079TW/5V0/WD regulates actuator MCU, provides watchdog supervision during PWM motor control, and handles LIN bus arbitration. Use Value: SPI-configurable watchdog window prevents runaway motor commands; ±58 V LIN short-circuit tolerance withstands accidental battery contact. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LIN SBC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UJA1076TW/5V0/WD | Same HTSSOP32 package and 5 V regulator, but lacks LIMP output and has reduced SPI register set - no limp-home fail-safe capability. | Applicable where fail-safe hardware fallback is not required; lower cost for non-critical nodes. | Select UJA1076TW/5V0/WD only if limp-home functionality is omitted from system architecture and diagnostic depth is reduced. |
| TLE7250GVIO | Infineon LIN SBC with 5 V/250 mA regulator and watchdog, but uses SOIC-14 package - no local wake inputs or SPI interface; analog status outputs only. | Suitable for simple LIN slaves with minimal diagnostics; cannot support complex wake-source management or register-level configuration. | Choose TLE7250GVIO when board space is constrained and only basic LIN transceiver + regulator + watchdog are needed - no SPI or multi-wake support. |
Compared with UJA1076TW/5V0/WD, the UJA1079TW/5V0/WD adds LIMP output and extended SPI diagnostics; versus TLE7250GVIO, it provides dual wake inputs, full SPI register access, and HTSSOP32 thermal performance - making it optimal for safety-aware, feature-rich LIN ECUs.
Availability
UJA1079TW/5V0/WD is available at Aetrix Electronics and suitable for automotive body electronics, seat control systems, and climate actuator modules requiring stable component supply, long-term lifecycle assurance, and AEC-Q100–aligned reliability.
Supply support for UJA1079TW/5V0/WD 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 automotive, industrial, and IoT solutions, with deep expertise in vehicle networking and power management ICs.
The UJA1079TW/5V0/WD belongs to NXP's System Basis Chip family - engineered specifically for automotive LIN ECU consolidation, combining power, communication, and safety functions into a single robust package for body electronics and sensor nodes.
FAQ
What LIN protocol versions does the UJA1079TW/5V0/WD support?
The UJA1079TW/5V0/WD supports LIN 2.1 and SAE J2602, and is backward-compatible with LIN 2.0 and LIN 1.3. It implements low-slope mode for improved EMC performance and includes an integrated termination diode at the DLIN pin - all confirmed in the official NXP datasheet Rev. 02.
Does the UJA1079TW/5V0/WD include a built-in watchdog, and what modes does it support?
Yes, the UJA1079TW/5V0/WD includes an advanced independent watchdog with on-chip oscillator clocking. It supports Window mode, Timeout mode, and Off mode - programmable via the WD_and_Status register (NWP bits), with default period of 128 ms. The WDOFF pin allows hardware disable, and WMC bit controls mode selection per operating state.
What is the purpose of the LIMP pin on the UJA1079TW/5V0/WD, and when is it activated?
The LIMP pin on the UJA1079TW/5V0/WD is an active-LOW fail-safe output that activates during overtemperature events or critical system faults. When chip temperature exceeds Tth(act)otp, the SBC enters Overtemp mode, drives RSTN LOW, and sets LHC bit to assert LIMP LOW - triggering hardware-level limp-home behavior in connected actuators or valves.
Can the UJA1079TW/5V0/WD operate during automotive cranking conditions?
Yes, the UJA1079TW/5V0/WD supports VBAT down to 4.5 V, meeting ISO 7637-3 and ISO 16750-2 cranking requirements. Its 5 V regulator remains stable under these conditions, and the V1 undervoltage detection (at 90 % or 70 % threshold) ensures safe MCU reset before brownout - verified in Section 2.5 and Table 10 of the datasheet.
How does the UJA1079TW/5V0/WD manage thermal dissipation in high-current applications?
The UJA1079TW/5V0/WD uses an HTSSOP32 package with exposed die pad for direct PCB heat sinking. Its 5 V regulator delivers up to 250 mA and supports external PNP transistor extension via VEXCTRL/VEXCC pins - enabling current sharing and distributed thermal load across the board, as detailed in Sections 2.1 and 6.5.2.
UJA1079TW/5V0/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:
- SPI Serial
- Voltage - Supply:
- 4.5V ~ 28V
- Supplier Device Package:
- 32-HTSSOP
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
UJA1079TW/5V0/WD,1 FAQ
1.How can I place an order for UJA1079TW/5V0/WD,1 through Aetrix?
Please submit a Request for Quotation (RFQ) for UJA1079TW/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 UJA1079TW/5V0/WD,1 reliable?
The price and inventory of UJA1079TW/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 UJA1079TW/5V0/WD,1 is usually 5 days.
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Once your UJA1079TW/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 UJA1079TW/5V0/WD,1?
For technical support, including UJA1079TW/5V0/WD,1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UJA1079TW/5V0/WD,1 requirements.
6.How does Aetrix verify that UJA1079TW/5V0/WD,1 is sourced from the original manufacturer or authorized distributors?
All UJA1079TW/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 UJA1079TW/5V0/WD,1 meets industry standards.
7.What is the process for return or replacement of UJA1079TW/5V0/WD,1?
All UJA1079TW/5V0/WD,1 units undergo pre-shipment inspection (PSI). If there is an issue with UJA1079TW/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 UJA1079TW/5V0/WD,1 part is unused and in its original packaging.
Return procedure for UJA1079TW/5V0/WD,1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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