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NXP Semiconductors UJA1066TW/5V0/T,51
- Part No.:
- UJA1066TW/5V0/T,51
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 32-TSSOP (0.240", 6.10mm Width) Exposed Pad
- Datasheet:
-
UJA1066TW/5V0/T,51.pdf
- Description:
- IC INTFACE SPECIALIZED 32HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,430
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Product details
Overview
UJA1066TW/5V0/T,51 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,51 datasheet, UJA1066TW/5V0/T,51 pinout, UJA1066TW/5V0/T,51 application, or UJA1066TW/5V0/T,51 equivalent, key selection criteria include CAN bus fault tolerance (±60 V short-circuit proof), low sleep current, programmable watchdog window timing, SPLIT pin for recessive bus stabilization, and fail-safe mode activation via INH/LIMP output.
Technical Context
The UJA1066TW/5V0/T,51 implements a state-machine-based fail-safe system controller supervised by an on-chip oscillator-clocked watchdog, supporting six distinct operating modes (Start-up, Restart, Normal, Standby, Sleep, Flash) with deterministic transitions triggered by reset events, wake-up signals, or SPI commands. Its CAN transceiver features partial networking, floating bus pins during power-off, and dedicated low-dropout regulation independent of the MCU supply.
Power management includes cyclic wake-up capability in Standby/Sleep modes, local wake-up input (BAT42-related), remote wake-up via CAN, and a 42 V high-side switch for external loads. Fail-safe reporting covers 23 bits of protected RAM for diagnostics, single-SPI-message status readout, and detection of V1 undervoltage, CAN bus shorts/opens, TXD/RXD clamping, and overtemperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CAN Standard | ISO 11898-2 and ISO 11898-5 compliant; interoperable with TJA1041/TJA1041A. |
| MCU Supply Voltage | 5.0 V regulated output (V1); fixed for UJA1066TW/5V0 variant. |
| CAN Transceiver Supply | 5 V regulated output (V2); independent of MCU supply, improves EMC. |
| Watchdog Type | Programmable fail-safe coded window & time-out watchdog with on-chip oscillator. |
| Sleep Current | Very low sleep current; enables ultra-low-power ECU standby operation. |
| ESD Protection | ±8 kV HBM and ±4 kV IEC 61000-4-2 on off-board pins. |
| CAN Bus Fault Tolerance | ±60 V short-circuit proof CANH/CANL pins; BAT/CAN pins protected per ISO 7637-3. |
| Package | HTSSOP32 (SOT549-1); 8 mm × 11 mm, 0.65 mm pitch, exposed die pad for thermal dissipation. |
Pinout & Package
UJA1066TW/5V0/T,51 is housed in a 32-pin HTSSOP package (SOT549-1) with 0.65 mm lead pitch, 6.1 mm body width, and an exposed die pad for enhanced thermal performance and EMC grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 | MCU voltage regulator output | 5.0 V regulated supply for microcontroller; undervoltage detection triggers fail-safe response. |
| V2 | CAN transceiver voltage regulator output | 5 V regulated supply for CAN transceiver; independent of V1, improves bus EMC stability. |
| RSTN | Reset output to MCU | Active LOW reset signal; detects clamping on reset line and holds LOW during start-up reset lengthening. |
| INTN | Interrupt output to MCU | Active LOW open-drain interrupt; wire-AND capable; signals faults including CAN bus failure or watchdog timeout. |
| EN | Enable output | Active HIGH push-pull enable; driven LOW on every reset/watchdog overflow to control external circuitry. |
| INH/LIMP | Inhibit / limp-home output | BAT14-related push-pull output; floats by default; drives warning lights or safety hardware in fail-safe mode. |
| WAKE | Local wake-up input | BAT42-related input; supports continuous or cyclic sampling to initiate wake-up from low-power modes. |
| SPLIT | CAN bus common-mode stabilization | Stabilizes recessive bus level; reduces common-mode noise and improves signal integrity on split-terminated buses. |
| CANH / CANL | CAN bus differential lines | High-speed CAN physical layer interface; ±60 V short-circuit tolerant; float when unpowered. |
| TXDC / RXDC | CAN logic interface | CMOS-level transmit data input and receive data output; compatible with standard CAN controller peripherals. |
| SDI / SDO / SCK / SCS | SPI interface | Full-duplex SPI (4-wire) with fail-safe coded protocol; SDO floats when SCS is HIGH for bus sharing. |
| BAT14 / BAT42 | Power supply inputs | BAT14: 14 V battery input; BAT42: 42 V battery input; connected together in 14 V systems. |
| V3 | Unregulated 42 V output | BAT42-related output; configurable as continuous or cyclic mode for driving external wake-up switches. |
| SENSE | Battery interrupt detector | Fast battery chatter/interrupt input; enables rapid response to battery supply instability. |
Key Features
| Feature | Design Value |
|---|---|
| Fail-safe coded SPI interface | Redundant-bit coding prevents spurious commands; ensures reliable communication during fault conditions. |
| Partial networking with global wake-up | Enables selective CAN communication without waking sleeping nodes; reduces system-wide power consumption. |
| 23-bit access-protected RAM | Dedicated non-volatile memory for logging cyclic faults and diagnostic history; readable via single SPI message. |
| Limp-home output activation | Drives safety-critical hardware (e.g., warning lights) automatically upon entry into Fail-safe mode. |
| Supply failure early warning | Triggers critical data storage before full undervoltage shutdown; preserves ECU state integrity. |
| On-chip oscillator supervision | Immediate transition to Fail-safe mode if oscillator fails or drifts out of spec; guarantees clock integrity. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Real-time engine monitoring and actuation in 14 V/42 V hybrid vehicle platforms. IC Role / Device Role / Timing Role: Central SBC providing regulated power, CAN communication, watchdog supervision, and fail-safe reset sequencing for the engine MCU. Use Value: Ensures deterministic start-up, prevents deadlock during CAN bus faults, and maintains MCU functionality during transient supply dips via V1 undervoltage reporting and early-warning storage. |
Use Scenario: Low-power interior lighting, door lock, and climate control coordination in modern automotive body networks. IC Role / Device Role / Timing Role: Power manager and CAN interface enabling cyclic wake-up, partial networking, and limp-home signaling for safety-critical alerts. Use Value: Achieves sub-100 µA sleep current while supporting remote flash programming and selective node wake-up without disturbing entire network. |
| Advanced Driver Assistance Systems (ADAS) ECU | Electric Power Steering (EPS) Control Unit |
|
Use Scenario: Sensor fusion and camera/radar processing units requiring high-reliability CAN connectivity and power supervision. IC Role / Device Role / Timing Role: Fail-safe SBC delivering isolated CAN transceiver supply (V2), precise watchdog window timing, and detailed diagnostics for ASIL-B compliance support. Use Value: Enables detection of TXD/RXD clamping, CAN bus opens/shorts, and overtemperature - feeding diagnostic logs to host MCU for ISO 26262 fault handling. |
Use Scenario: Safety-critical steering assist control with real-time torque feedback and fail-operational requirements. IC Role / Device Role / Timing Role: System basis chip managing MCU power (V1), CAN bus integrity, and generating INH/LIMP output to activate mechanical fallback actuators. Use Value: Guarantees controlled shutdown and limp-home activation within defined timing windows; supports cyclic wake-up for periodic sensor self-test without CAN bus disturbance. |
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,118 | Single-chip CAN transceiver only; no integrated regulators, watchdog, or SPI interface. | Lacks system-level power management and fail-safe supervision; requires external components for full ECU functionality. | Choose when only CAN physical layer is needed and discrete power/monitoring ICs are already in design. |
| UJA1075TK/3V3/1 | 3.3 V MCU regulator version; identical pinout and feature set except V1 output voltage. | Designed for 3.3 V microcontrollers; not electrically interchangeable with UJA1066TW/5V0/T,51 due to V1 mismatch. | Choose only for new 3.3 V MCU designs; requires PCB layout verification for regulator decoupling and thermal path. |
Compared with TJA1021T/CM,118 and UJA1075TK/3V3/1, the UJA1066TW/5V0/T,51 delivers full ECU integration - combining CAN transceiver, dual regulators, watchdog, SPI, and fail-safe logic in one HTSSOP32 package - reducing BOM count, board space, and validation effort for automotive networking nodes.
Availability
UJA1066TW/5V0/T,51 is available at Aetrix Electronics and suitable for automotive engine control, body electronics, ADAS domain controllers, and electric power steering systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for UJA1066TW/5V0/T,51 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 CAN, SBC, and functional safety technologies.
The UJA1066 belongs to NXP's System Basis Chip product line, engineered specifically for automotive electronic control units needing integrated power, communication, supervision, and fail-safe behavior in harsh 14 V/42 V environments.
FAQ
What is the primary function of the UJA1066TW/5V0/T,51 in an automotive ECU?
The UJA1066TW/5V0/T,51 serves as a fail-safe System Basis Chip that integrates high-speed CAN transceiver, dual voltage regulators (5.0 V for MCU and 5 V for CAN), enhanced watchdog, SPI interface, and limp-home output. It replaces discrete components in automotive ECUs, ensuring safe start-up, deterministic fault recovery, and robust power management in 14 V/42 V architectures. The UJA1066TW/5V0/T,51 is essential for maintaining MCU operation and CAN communication under transient, fault, or low-power conditions.
Does the UJA1066TW/5V0/T,51 support both 14 V and 42 V battery systems?
Yes, the UJA1066TW/5V0/T,51 is explicitly designed for dual-voltage architectures: it accepts BAT14 (14 V) and BAT42 (42 V) inputs, with internal logic enabling operation in either configuration. In 14 V systems, BAT42 is connected to BAT14; in 42 V systems, BAT42 operates independently. The SBC regulates V1 (5.0 V) and V2 (5 V) from these supplies and provides a dedicated 42 V-related V3 output for external wake-up switches - all confirmed in the official NXP datasheet Rev. 03.
How does the watchdog in the UJA1066TW/5V0/T,51 differ from standard implementations?
The UJA1066TW/5V0/T,51 features a fail-safe coded watchdog with three operational modes: Window (for strict software timing in Normal mode), Time-out (for cyclic wake-up in Standby/Sleep), and OFF (for fail-safe shutdown). All accesses require redundant-bit coding via SPI, rejecting illegal codes with immediate reset. It is clocked by an on-chip oscillator and monitors RSTN clamping, making it immune to external clock failure. This architecture ensures autonomous supervision even if the host MCU hangs or corrupts commands - a core differentiator of the UJA1066TW/5V0/T,51.
What is the purpose of the SPLIT pin on the UJA1066TW/5V0/T,51?
The SPLIT pin on the UJA1066TW/5V0/T,51 provides a common-mode stabilization output for split-terminated CAN buses. It actively drives the midpoint voltage between CANH and CANL during recessive states, reducing electromagnetic emissions and improving signal integrity - especially in noisy automotive environments. Unlike passive termination, SPLIT enables dynamic bus biasing, which enhances immunity to ground shift and common-mode noise. This function is documented in Section 2.2 of the NXP datasheet and is unique to advanced CAN SBCs like the UJA1066TW/5V0/T,51.
Can the UJA1066TW/5V0/T,51 be used for remote firmware updates over CAN?
Yes, the UJA1066TW/5V0/T,51 supports remote flash programming via the CAN bus, as stated in Section 2.1 of the NXP datasheet. Its fail-safe architecture enables secure entry into Flash mode using a three-step SPI-coded sequence (111/001/111), followed by handshake confirmation. During Flash mode, the watchdog remains active with strict timing enforcement (Mode code 111 required), preventing unauthorized or corrupted updates. This capability allows OEMs to deploy over-the-air (OTA) updates while maintaining functional safety - a key requirement for modern automotive ECUs using the UJA1066TW/5V0/T,51.
UJA1066TW/5V0/T,51 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:
- Networking
- Interface:
- SPI
- Voltage - Supply:
- 3.3V ~ 5V
- Supplier Device Package:
- 32-HTSSOP
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
UJA1066TW/5V0/T,51 FAQ
1.How can I place an order for UJA1066TW/5V0/T,51 through Aetrix?
Please submit a Request for Quotation (RFQ) for UJA1066TW/5V0/T,51 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,51 reliable?
The price and inventory of UJA1066TW/5V0/T,51 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,51 is usually 5 days.
3.What payment methods are accepted for UJA1066TW/5V0/T,51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UJA1066TW/5V0/T,51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UJA1066TW/5V0/T,51?
UJA1066TW/5V0/T,51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UJA1066TW/5V0/T,51 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,51?
For technical support, including UJA1066TW/5V0/T,51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UJA1066TW/5V0/T,51 requirements.
6.How does Aetrix verify that UJA1066TW/5V0/T,51 is sourced from the original manufacturer or authorized distributors?
All UJA1066TW/5V0/T,51 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,51 meets industry standards.
7.What is the process for return or replacement of UJA1066TW/5V0/T,51?
All UJA1066TW/5V0/T,51 units undergo pre-shipment inspection (PSI). If there is an issue with UJA1066TW/5V0/T,51, 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,51 part is unused and in its original packaging.
Return procedure for UJA1066TW/5V0/T,51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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