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NXP Semiconductors UJA1066TW/3V3/T
- Part No.:
- UJA1066TW/3V3/T
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 32-TSSOP (0.240", 6.10mm Width) Exposed Pad
- Datasheet:
-
UJA1066TW/3V3/T.pdf
- Description:
- IC INTFACE SPECIALIZED 32HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,924
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Product details
Overview
UJA1066TW/3V3/T from NXP Semiconductors is a fail-safe System Basis Chip (SBC) integrating high-speed CAN transceiver (ISO 11898-2/5 compliant), 3.3 V microcontroller regulator, 5 V CAN transceiver regulator, enhanced window watchdog with on-chip oscillator, and SPI interface - designed for automotive ECUs requiring robust power management, fail-safe startup, and CAN-based networking in 14 V/42 V architectures.
For engineers reviewing the UJA1066TW/3V3/T datasheet, UJA1066TW/3V3/T pinout, UJA1066TW/3V3/T application, or UJA1066TW/3V3/T equivalent, this device delivers deterministic reset behavior, cyclic wake-up capability in Standby/Sleep modes, detailed diagnostics reporting via SPI, and limp-home output activation during Fail-safe mode - critical for ECU functional safety compliance.
Technical Context
The UJA1066TW/3V3/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 features SPLIT output for recessive bus stabilization, partial networking support, and ±60 V short-circuit protection on CANH/CANL.
Power management includes dual independent regulators (V1 = 3.3 V ±2 %, V2 = 5 V), BAT42-related 42 V switched output (V3), local wake-up input (WAKE), system inhibit (SYSINH), and intelligent interrupt (INTN) with wire-AND capability. Fail-safe diagnostics report 23 distinct fault conditions - including V1 undervoltage, CAN bus open/short, oscillator failure, and overtemperature - in a single SPI message.
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 | 3.3 V ±2 % regulated output for microcontroller; low dropout, current-limited, with undervoltage detection |
| V2 Output | 5 V regulated output dedicated to CAN transceiver; independent of V1 supply |
| Watchdog Type | Programmable fail-safe coded window & time-out watchdog with on-chip oscillator; 10 selectable periods |
| SPI Interface | Fail-safe coded 16-bit full-duplex SPI; supports device identification, status reporting, and mode control |
| Operating Voltage | Supports 14 V single-supply and 14 V/42 V dual-supply architectures; BAT14 and BAT42 inputs |
| ESD Protection | ±8 kV HBM and ±4 kV IEC 61000-4-2 on off-board pins; ±60 V short-circuit proof CAN bus pins |
| Package | HTSSOP32 (SOT549-1); 8 mm × 11 mm body, 0.65 mm pitch, exposed die pad for thermal/EMC performance |
Pinout & Package
UJA1066TW/3V3/T uses the HTSSOP32 (SOT549-1) package: 32-pin plastic thermal-enhanced thin shrink small outline package with 6.1 mm body width, 0.65 mm lead pitch, and exposed die pad (electrically isolated, recommended connected to GND for optimal EMC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 | Microcontroller supply output | 3.3 V regulated output; powers MCU core; monitored for undervoltage/failure reporting |
| V2 | CAN transceiver supply output | 5 V regulated output; independent of V1; enables stable CAN bus operation under load |
| RSTN | Reset output | Active-low push-pull reset signal to MCU; detects clamping and asserts extended reset in Start-up mode |
| INTN | Interrupt output | Active-low open-drain interrupt; wire-AND capable; signals faults, wake-ups, or watchdog events |
| EN | Enable output | Active-high push-pull enable; driven LOW on every reset/watchdog overflow to control external logic |
| INH/LIMP | Inhibit/limp-home output | BAT14-related push-pull output; floats by default; drives warning lights or fallback hardware in Fail-safe mode |
| WAKE | Local wake-up input | BAT42-related input; supports continuous or cyclic sampling to trigger wake-up from low-power modes |
| CANH / CANL | CAN bus differential pair | High-speed CAN physical layer interface; ±60 V short-circuit protected; floating when powered down |
| SPLIT | CAN common-mode stabilization | Output stabilizes recessive bus level; improves EMC and noise immunity on split-termination networks |
| TXDC / RXDC | CAN logic interface | Digital-level transmit/receive data between MCU CAN controller and internal transceiver |
| SDI / SDO / SCK / SCS | SPI interface | Fail-safe coded 16-bit full-duplex SPI; SDO floats when SCS is HIGH; supports diagnostics and configuration |
| BAT14 / BAT42 | Power supply inputs | Separate 14 V and 42 V battery inputs; BAT42 used in dual-supply systems; connect to BAT14 in 14 V-only designs |
| V3 | Switched 42 V output | BAT42-related output; configurable as continuous, OFF, or cyclic (synced to WAKE) for driving relays/wake switches |
| SENSE | Battery interrupt detector | Fast battery chatter detector input; triggers interrupt on rapid voltage fluctuations at BAT14/BAT42 |
Key Features
| Feature | Design Value |
|---|---|
| Fail-safe state machine | Hardware-enforced six-mode operation (Start-up, Restart, Normal, Standby, Sleep, Flash) with deterministic transitions and reset source reporting |
| Autonomous diagnostics | 23-bit access-protected RAM for logging; single-SPI-message status reporting covering CAN faults, regulator issues, oscillator failure, and overtemperature |
| Limp-home activation | Dedicated INH/LIMP output activates external warning hardware (e.g., dashboard lights) upon entry into Fail-safe mode without software intervention |
| Cyclic wake-up capability | Configurable watchdog time-out in Standby/Sleep modes enables periodic MCU wake-up for sensor polling or communication without CAN bus activity |
| Partial networking support | Global wake-up feature allows selective CAN communication while keeping other nodes asleep - reducing overall ECU network power consumption |
| Flash mode security | Triple-code SPI sequence (111→001→111) required to enter Flash mode; prevents accidental firmware updates and enforces fail-safe handshake protocol |
Applications
| Body Control Module (BCM) | Engine Control Unit (ECU) |
|---|---|
Use Scenario: Centralized vehicle lighting, door lock, and window control with CAN network integration. IC Role / Device Role / Timing Role: UJA1066TW/3V3/T serves as primary power manager and CAN interface, providing regulated 3.3 V for MCU, 5 V for transceiver, and fail-safe reset supervision. Use Value: Enables reliable cold-cranking operation via BAT42 support, reduces component count vs. discrete solutions, and ensures limp-home activation of hazard lights during fault conditions. | Use Scenario: Real-time engine timing, fuel injection, and emissions control in gasoline/diesel powertrains. IC Role / Device Role / Timing Role: UJA1066TW/3V3/T acts as fail-safe system basis chip, managing MCU power-up sequencing, CAN communication integrity, and watchdog supervision for ASIL-B–capable designs. Use Value: Guarantees deterministic startup behavior, reports CAN bus shorts/opens before engine cranking, and maintains MCU functionality during transient battery dips per ISO 7637-3. |
| Advanced Driver Assistance Systems (ADAS) ECU | Electric Power Steering (EPS) Control Unit |
Use Scenario: Sensor fusion and camera/radar processing with CAN FD gateway functionality. IC Role / Device Role / Timing Role: UJA1066TW/3V3/T provides isolated 3.3 V supply, CAN physical layer, and fail-safe watchdog for vision processor subsystems. Use Value: Supports remote flash programming via CAN bus, delivers ±8 kV HBM ESD protection for external connectors, and enables cyclic wake-up for low-duty-cycle radar scanning. | Use Scenario: Torque-assist motor control with torque feedback, position sensing, and CAN-based vehicle network integration. IC Role / Device Role / Timing Role: UJA1066TW/3V3/T supplies regulated power, monitors battery transients, and provides fail-safe reset signaling to EPS MCU during steering assist faults. Use Value: Prevents deadlock via autonomous fail-safe behavior, reports overtemperature warnings before thermal shutdown, and activates limp-home output to disable assist while retaining basic steering function. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fail-safe SBC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TJA1023TK/3V3/1 | Single 3.3 V regulator only; no V3 switched output; no SPLIT pin; lower ESD rating (±6 kV HBM) | Lacks 42 V support and limp-home output; suitable for cost-sensitive 14 V-only modules without partial networking | Select when 42 V architecture and autonomous limp-home activation are not required. |
| UJA1075TW/3V3/T | Enhanced version with integrated LIN transceiver, higher V3 drive capability (1.5 A), and extended temperature range (−40 °C to +150 °C) | Supports LIN+CAN hybrid networks and higher ambient temperatures; adds LIN physical layer without external components | Select when LIN bus integration, higher junction temperature tolerance, or increased V3 load drive is needed. |
Compared with TJA1023TK/3V3/1, UJA1066TW/3V3/T provides dual-supply support and fail-safe limp-home activation; compared with UJA1075TW/3V3/T, it offers lower system cost and smaller footprint where LIN is unnecessary and 125 °C operation suffices.
Availability
UJA1066TW/3V3/T is available at Aetrix Electronics and suitable for automotive body control, engine management, ADAS domain controllers, and electric power steering systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for UJA1066TW/3V3/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 focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in automotive-grade mixed-signal ICs and functional safety design.
The UJA1066TW/3V3/T belongs to NXP's System Basis Chip product line, engineered specifically for automotive electronic control units requiring integrated power management, high-speed CAN communication, and ASIL-ready fail-safe behavior.
FAQ
What is the primary function of the UJA1066TW/3V3/T in an automotive ECU?
The UJA1066TW/3V3/T serves as a fail-safe System Basis Chip that integrates power regulation (3.3 V MCU supply, 5 V CAN supply), high-speed CAN transceiver (ISO 11898-2/5), watchdog, SPI interface, and fault diagnostics into a single HTSSOP32 package. It ensures deterministic startup, autonomous failure handling, and limp-home activation - all critical for automotive functional safety compliance in ECUs.
Does the UJA1066TW/3V3/T support both 14 V and 42 V automotive battery architectures?
Yes, the UJA1066TW/3V3/T explicitly supports both 14 V single-supply and 14 V/42 V dual-supply architectures via dedicated BAT14 and BAT42 inputs. In 14 V-only designs, BAT42 must be connected to BAT14. Its V3 output is BAT42-related and configurable for driving external loads like relays in 42 V systems.
How does the UJA1066TW/3V3/T implement fail-safe behavior during power faults?
The UJA1066TW/3V3/T implements fail-safe behavior through hardware-enforced operating modes, real-time monitoring of V1 undervoltage, CAN bus faults, oscillator failure, and overtemperature. Upon detection, it enters Fail-safe mode - disabling V1, asserting RSTN LOW, floating INH/LIMP, and enabling limp-home output - while retaining ability to wake via CAN or WAKE pin for controlled recovery.
What is the purpose of the SPLIT pin on the UJA1066TW/3V3/T?
The SPLIT pin on the UJA1066TW/3V3/T provides common-mode stabilization for the CAN bus by actively controlling the recessive bus level. It improves electromagnetic compatibility (EMC) and noise immunity in split-termination CAN networks, especially in electrically noisy automotive environments where bus signal integrity is critical.
Can the UJA1066TW/3V3/T perform remote firmware updates over the CAN bus?
Yes, the UJA1066TW/3V3/T supports remote flash programming via the CAN bus. Its fail-safe Flash mode requires a secure triple-code SPI sequence (111→001→111) to initiate, ensuring unauthorized or accidental firmware updates are prevented while enabling authenticated over-the-air (OTA) updates in production vehicles.
UJA1066TW/3V3/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/3V3/T FAQ
1.How can I place an order for UJA1066TW/3V3/T through Aetrix?
Please submit a Request for Quotation (RFQ) for UJA1066TW/3V3/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/3V3/T reliable?
The price and inventory of UJA1066TW/3V3/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/3V3/T is usually 5 days.
3.What payment methods are accepted for UJA1066TW/3V3/T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UJA1066TW/3V3/T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UJA1066TW/3V3/T?
UJA1066TW/3V3/T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UJA1066TW/3V3/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/3V3/T?
For technical support, including UJA1066TW/3V3/T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UJA1066TW/3V3/T requirements.
6.How does Aetrix verify that UJA1066TW/3V3/T is sourced from the original manufacturer or authorized distributors?
All UJA1066TW/3V3/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/3V3/T meets industry standards.
7.What is the process for return or replacement of UJA1066TW/3V3/T?
All UJA1066TW/3V3/T units undergo pre-shipment inspection (PSI). If there is an issue with UJA1066TW/3V3/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/3V3/T part is unused and in its original packaging.
Return procedure for UJA1066TW/3V3/T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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