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NXP Semiconductors UJA1066TW/5V0/T
- Part No.:
- UJA1066TW/5V0/T
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 32-TSSOP (0.240", 6.10mm Width) Exposed Pad
- Datasheet:
-
UJA1066TW/5V0/T.pdf
- Description:
- IC INTFACE SPECIALIZED 32HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,241
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Product details
Overview
UJA1066TW/5V0/T from NXP Semiconductors is a fail-safe System Basis Chip (SBC) integrating high-speed CAN transceiver (ISO 11898-2/5 compliant), dual voltage regulators (5.0 V for MCU and 5 V for CAN), enhanced window watchdog with on-chip oscillator, SPI interface, and limp-home output - designed for automotive ECUs requiring robust power management and fail-safe supervision in 14 V/42 V architectures.
For engineers reviewing the UJA1066TW/5V0/T datasheet, UJA1066TW/5V0/T pinout, UJA1066TW/5V0/T application, or UJA1066TW/5V0/T equivalent, key selection considerations include its 5.0 V microcontroller regulator output, HTSSOP32 package with exposed die pad, fail-safe coded SPI interface, partial networking support, and ±60 V short-circuit proof CAN bus pins.
Technical Context
The UJA1066TW/5V0/T implements a state-machine-based fail-safe system controller supervised by an on-chip oscillator-clocked watchdog, supporting six defined operating modes (Start-up, Restart, Normal, Standby, Sleep, Flash) with programmable transitions via SPI. Its CAN transceiver includes SPLIT pin for recessive bus stabilization and supports partial networking with global wake-up.
Power management integrates three regulated outputs: V1 (5.0 V, microcontroller supply), V2 (5 V, CAN transceiver supply), and V3 (unregulated 42 V, cyclic or continuous), plus BAT14/BAT42 dual-supply handling and SYSINH-controlled external DC-DC converters. Fail-safe reporting covers 23 diagnostic flags - including CAN bus shorts/opens, V1 undervoltage, oscillator failure, and ECU ground shift - delivered in single SPI messages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CAN Standard | ISO 11898-2 and ISO 11898-5 compliant high-speed transceiver; interoperable with TJA1041/TJA1041A |
| V1 Output Voltage | 5.0 V ±3 %; dedicated microcontroller supply with undervoltage detection and reset assertion |
| V2 Output Voltage | 5 V ±3 %; independent CAN transceiver supply, isolated from V1 and guarded by CAN-bus failure management |
| Watchdog Type | Programmable fail-safe coded window & time-out watchdog with on-chip oscillator; 10 selectable periods |
| Package | HTSSOP32 (SOT549-1); 8 mm × 11 mm, 0.65 mm pitch, exposed die pad for thermal/EMC optimization |
| ESD Protection | ±8 kV HBM and ±4 kV IEC 61000-4-2 on off-board pins; ±60 V short-circuit proof CANH/CANL |
| Operating Supply | Supports 14 V single-supply and 14 V/42 V dual-supply architectures; BAT14 and BAT42 inputs |
Pinout & Package
UJA1066TW/5V0/T is housed in a 32-pin HTSSOP package (SOT549-1) with 8 mm × 11 mm footprint, 0.65 mm lead pitch, and exposed die pad for enhanced thermal dissipation and EMC performance. The die pad may be left floating or connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 | Microcontroller supply output | 5.0 V regulated output; enables defined MCU start-up and asserts RSTN on undervoltage |
| V2 | CAN transceiver supply output | 5 V regulated output; independent of V1, improves EMC and isolates CAN faults from MCU rail |
| RSTN | Active-low reset output | Drives MCU reset; detects clamping and open-circuit conditions on reset line |
| INTN | Active-low interrupt output | Open-drain, wire-AND capable; signals diagnostics, watchdog events, and wake-ups to MCU |
| INH/LIMP | Inhibit / limp-home output | BAT14-referenced push-pull output; activates warning lights or safety hardware in Fail-safe mode |
| WAKE | Local wake-up input | BAT42-referenced; supports continuous or cyclic sampling for low-power wake-up without CAN activity |
| CANH / CANL | CAN bus differential pair | ±60 V short-circuit proof; bus lines float when powered off; supports partial networking |
| SPLIT | CAN common-mode stabilization | Stabilizes recessive bus level; improves signal integrity in noisy automotive environments |
| SDI / SDO / SCK / SCS | SPI interface | Fail-safe coded full-duplex SPI; SDO floats when SCS is HIGH; supports device identification and status reporting |
| BAT14 / BAT42 | Power supply inputs | BAT14 = 14 V battery input; BAT42 = 42 V battery input; connect together in 14 V systems |
Key Features
| Feature | Design Value |
|---|---|
| Fail-safe coded SPI interface | Prevents erroneous register writes; all SPI accesses require redundant bit coding for critical functions like watchdog service |
| Partial networking with global wake-up | Enables selective CAN communication while keeping sleeping nodes inactive; reduces system-wide current draw |
| 23-bit protected diagnostic RAM | Stores cyclic fault logs (e.g., overtemperature, ground shift, CAN errors); accessible via SPI without frame assembly |
| Three-regulator power architecture | V1 (5.0 V MCU), V2 (5 V CAN), V3 (42 V cyclic/continuous) - each with independent monitoring and failure reporting |
| Intelligent wake-up coordination | Combines local WAKE pin, CAN bus activity, and V3 overload detection to trigger wake-up from Sleep/Standby without reset |
| Limp-home output activation | INH/LIMP drives safety-critical hardware (e.g., warning lights) automatically upon entry into Fail-safe mode |
Applications
| Body Control Module (BCM) | Engine Control Unit (ECU) |
|---|---|
|
Use Scenario: Centralized power and communication management for door locks, lighting, and climate actuators in modern vehicles. IC Role / Device Role / Timing Role: UJA1066TW/5V0/T serves as the fail-safe SBC, providing regulated 5.0 V MCU supply, CAN transceiver, watchdog supervision, and limp-home signaling during fault conditions. Use Value: Enables deterministic start-up, autonomous fault recovery, and safe degradation (e.g., activating hazard lights) without MCU intervention. |
Use Scenario: Robust ECU power and network interface for gasoline/diesel engine management under harsh thermal and electrical conditions. IC Role / Device Role / Timing Role: UJA1066TW/5V0/T delivers 5.0 V MCU power, 5 V CAN transceiver supply, ISO 11898-2-compliant CAN interface, and fail-safe watchdog with on-chip oscillator timing. Use Value: Guarantees controlled boot sequence, detects CAN bus shorts/opens, and maintains MCU operation during transient battery dips per ISO 7637-3. |
| Advanced Driver Assistance Systems (ADAS) Domain Controller | Electric Power Steering (EPS) ECU |
|
Use Scenario: Safety-critical domain controller aggregating radar, camera, and ultrasonic sensor data via high-speed CAN backbone. IC Role / Device Role / Timing Role: UJA1066TW/5V0/T acts as the system basis chip managing power sequencing, CAN physical layer, and fail-safe supervision for multi-core MCU. Use Value: Provides detailed diagnostics (e.g., ground shift, oscillator failure) and 23-bit protected RAM for ASIL-B-compliant logging and fallback execution. |
Use Scenario: Real-time torque control ECU requiring ultra-reliable power and CAN communication with zero tolerance for deadlock. IC Role / Device Role / Timing Role: UJA1066TW/5V0/T supplies 5.0 V to EPS MCU, powers CAN transceiver, monitors V1/V2/BAT42, and triggers limp-home output on failure. Use Value: Prevents system lock-up via advanced fail-safe behavior; supports cyclic wake-up from Sleep mode for low-current standby monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fail-safe SBC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TJA1021T/CM | Single 5 V regulator (no V3 output); no 42 V support; lacks SPLIT pin and 23-bit diagnostic RAM | Targeted at cost-sensitive 14 V-only body electronics; no partial networking or cyclic V3 drive | Choose for simpler 14 V applications where 42 V capability and advanced diagnostics are unnecessary |
| UJA1075TW/5V0/T | Successor with extended CAN FD support, higher V3 current rating (200 mA vs. 100 mA), and enhanced thermal performance | Designed for next-gen ADAS/EPS requiring CAN FD data rates and higher load drive capability | Choose for new designs needing CAN FD readiness and improved power delivery headroom |
Compared with TJA1021T/CM, UJA1066TW/5V0/T adds 42 V architecture support, partial networking, and comprehensive diagnostics; versus UJA1075TW/5V0/T, it lacks CAN FD but offers proven qualification and lower system cost in legacy 14 V/42 V platforms.
Availability
UJA1066TW/5V0/T is available at Aetrix Electronics and suitable for automotive body control modules, engine control units, ADAS domain controllers, and electric power steering ECUs requiring stable component supply across long production lifecycles.
Supply support for UJA1066TW/5V0/T 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 UJA1066TW/5V0/T belongs to NXP's System Basis Chip family, engineered specifically for fail-safe power management and network interface integration in automotive electronic control units operating in 14 V and 42 V architectures.
FAQ
What is the primary function of the UJA1066TW/5V0/T in an automotive ECU?
The UJA1066TW/5V0/T serves as a fail-safe System Basis Chip that integrates core ECU functions: a high-speed CAN transceiver (ISO 11898-2/5), dual voltage regulators (5.0 V for MCU and 5 V for CAN), an enhanced window watchdog with on-chip oscillator, SPI interface, and limp-home output. It ensures deterministic start-up, autonomous fault detection, and safe degradation - all critical for automotive safety compliance. The UJA1066TW/5V0/T replaces discrete components while delivering coordinated power, communication, and supervision in a single HTSSOP32 package.
Does the UJA1066TW/5V0/T support both 14 V and 42 V vehicle electrical architectures?
Yes, the UJA1066TW/5V0/T is explicitly designed for dual-supply operation: it accepts BAT14 (14 V battery input) and BAT42 (42 V battery input), with internal circuitry enabling seamless use in either 14 V-only systems (where BAT14 and BAT42 are connected) or true 14 V/42 V hybrid architectures. Its V3 output provides unregulated 42 V in cyclic or continuous mode, and all regulators, watchdog, and CAN transceiver are qualified for operation across this extended voltage range per ISO 7637-3 transient immunity requirements.
How does the fail-safe watchdog in the UJA1066TW/5V0/T differ from standard watchdog timers?
The UJA1066TW/5V0/T features a fail-safe coded watchdog clocked directly by an on-chip oscillator and supporting Window, Time-out, and OFF modes - with all SPI-based watchdog accesses requiring redundant bit coding to prevent spurious resets. Unlike generic watchdogs, it performs clamping detection on RSTN, validates Mode register codes, and forces immediate transition to Fail-safe mode on oscillator failure. Its 10 programmable periods and synchronized mode-change logic ensure strict software supervision without blind spots - a requirement for ASIL-B automotive systems. The UJA1066TW/5V0/T watchdog is integral to the SBC's state-machine-based fail-safe controller.
What is the purpose of the SPLIT pin on the UJA1066TW/5V0/T?
The SPLIT pin on the UJA1066TW/5V0/T stabilizes the recessive common-mode voltage level on the CAN bus, improving signal integrity and electromagnetic compatibility in electrically noisy automotive environments. It actively drives the midpoint between CANH and CANL during recessive states, reducing bus oscillation and enhancing noise immunity - especially critical in high-density wiring harnesses and near high-power actuators. This feature is not present in basic CAN transceivers and contributes directly to the UJA1066TW/5V0/T's ISO 11898-2/5 compliance and robustness in demanding ECU applications.
Can the UJA1066TW/5V0/T be used for remote flash programming over CAN?
Yes, the UJA1066TW/5V0/T supports remote flash programming via the CAN bus through its fail-safe Flash mode entry sequence: three consecutive SPI writes to the Mode register using codes 111 → 001 → 111, followed by Operating Mode code 011 within tWD(init). This sequence triggers a hardware handshake and system reset, enabling secure, supervised firmware updates without physical access. The UJA1066TW/5V0/T also provides detailed status reporting and protected RAM for logging update progress - ensuring reliability and traceability during over-the-air or dealer-level reprogramming.
UJA1066TW/5V0/T 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:
- Networking
- Interface:
- SPI
- Voltage - Supply:
- 3.3V ~ 5V
- Supplier Device Package:
- 32-HTSSOP
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
UJA1066TW/5V0/T FAQ
1.How can I place an order for UJA1066TW/5V0/T through Aetrix?
Please submit a Request for Quotation (RFQ) for UJA1066TW/5V0/T 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 UJA1066TW/5V0/T reliable?
The price and inventory of UJA1066TW/5V0/T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UJA1066TW/5V0/T is usually 5 days.
3.What payment methods are accepted for UJA1066TW/5V0/T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UJA1066TW/5V0/T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UJA1066TW/5V0/T?
UJA1066TW/5V0/T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UJA1066TW/5V0/T 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 UJA1066TW/5V0/T?
For technical support, including UJA1066TW/5V0/T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UJA1066TW/5V0/T requirements.
6.How does Aetrix verify that UJA1066TW/5V0/T is sourced from the original manufacturer or authorized distributors?
All UJA1066TW/5V0/T 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 UJA1066TW/5V0/T meets industry standards.
7.What is the process for return or replacement of UJA1066TW/5V0/T?
All UJA1066TW/5V0/T units undergo pre-shipment inspection (PSI). If there is an issue with UJA1066TW/5V0/T, 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 UJA1066TW/5V0/T part is unused and in its original packaging.
Return procedure for UJA1066TW/5V0/T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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