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NXP Semiconductors TJA1445/TJA1446 High-Speed CAN Transceivers

NXP Semiconductors TJA1445 and TJA1446 Advanced High-Speed CAN Transceivers feature a partial networking sleep mode and implement CAN FD as defined in ISO11898-2:2024 parameter sets A-B. These NXP Semiconductors TJA144x transceivers are fully interoperable with the high-speed classical CAN and CAN FD protocols and have been fully developed and certified to be ISO 26262 ASIL-B compliant. TJA144x supports CAN partial networking using selective wake-up functionality (as specified in ISO 11898-2:2024), allowing the transceiver to remain in sleep mode even when CAN bus traffic is running (when it is not required to be active). The TJA1445 offers a CAN FD passive feature (in sleep mode) that prevents the transceiver from waking up and shields the CAN controller from CAN FD messages when running a mixed bus communication. The TJA1446 offers that feature and also shields from CAN XL messages.

The NXP Semiconductors TJA1445B and TJA1446 transceivers offer an extended feature set on top of the TJA1445. The TJA1445B includes a TXEN_N pin for disabling the transmitter through an external pin and three GPIO pins that can be configured to an extended set of functionalities, including a second TXD/RXD channel. The TJA1446 includes two configurable GPIO pins, a Q&A watchdog with dedicated reset and failsafe/limp home pins, and accurate VIO undervoltage and overvoltage monitoring.

Features

  • ISO 11898-2:2024 parameter sets A-B, SAE J2284-1 to SAE J2284-5 and SAE J1939-14 compliant
  • ISO 26262, ASIL B compliant
  • Partial networking capability through selective wake-up functionality
  • Q&A watchdog with window and timeout modes
  • Configurable general-purpose I/O (GPIO) pins (TJA1445B and TJA1446)
  • Direct transmitter on/off control input (TXEN_N) (TJA1445B)
  • Autonomous bus biasing
  • Low electromagnetic emission (EME) and high electromagnetic immunity (EMI)
  • Qualified according to AEC-Q100 Grade 1
  • VIO input for interfacing with 1.8V, 3.3V to 5V microcontrollers
  • Package options
    • SO14 or HVSON14 for TJA1445A
    • DHVQFN18 for TJA1445B and TJA1446
  • Low-power management
    • Very low-current Standby and Sleep modes, with local and remote wake-up capability
    • Local wake-up via the WAKE pin
    • Remote wake-up via a wake-up pattern (WUP) or wake-up frame (WUF)
    • Configurable CAN wake-up pattern (dom-rec-dom or dom-rec-dom-rec) according to ISO 11898-2:2024
    • Selective wake-up according to ISO 11898-2:2024
  • Predictable and fail-safe behavior
    • Undervoltage detection on all supply pins with defined behavior below the undervoltage thresholds
    • Functionality is guaranteed from the undervoltage detection thresholds up to the maximum limiting voltage values
    • Transceiver disengages from the bus (high-ohmic) when the battery voltage drops below the Off mode threshold
    • Internal biasing of TXD to enable defined fail-safe behavior
    • Dedicated failsafe pin, configurable for limp-home or failsafe output functionality (TJA1446)
    • Dedicated reset pin for triggering and detecting reset events (TJA1446)
  • Diagnosis and protection
    • Overtemperature diagnosis and protection
    • Overvoltage detection with defined behavior on VIO supply pin (TJA1446)
    • Transmit data (TXD) dominant time-out diagnosis and protection
    • Bus dominant failure diagnosis
    • Cold start diagnosis (first battery connection)
    • High ESD handling capability on the bus pins
    • Bus pins and VBAT protected against automotive transients
  • Moisture Sensitivity Level (MSL) 1
  • Lead-free, Halogen-free, and RoHS-compliant

Applications

  • Automotive zone controllers
  • Automotive Battery Management System (BMS)
  • Electric Vehicle (EV) traction inverters
  • Hybrid Electric Vehicles (HEVs)
  • Automotive electrification and powertrain (TJA1445 only)
  • Software-defined vehicle infrastructures (TJA1445 only)
  • Industrial data buses and battery management

Datasheets

  • TJA1445 high-speed CAN transceiver with partial networking
  • TJA1446 high-speed CAN transceiver with partial networking and advanced system monitoring

TJA1445A Block Diagram

Block Diagram - NXP Semiconductors TJA1445/TJA1446 High-Speed CAN Transceivers

TJA1445B Block Diagram

Block Diagram - NXP Semiconductors TJA1445/TJA1446 High-Speed CAN Transceivers

TJA1446 Block Diagram

Block Diagram - NXP Semiconductors TJA1445/TJA1446 High-Speed CAN Transceivers

Resources

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Published: 2025-01-13 | Updated: 2025-10-14