High-Speed CAN Transceiver with Standby Mode

TJA1042

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The TJA1042 high-speed CAN transceiver provides an interface between a controller area network (CAN) protocol controller and the physical two-wire CAN bus. The transceiver is designed for high-speed CAN applications in the automotive industry, providing the differential transmit and receive capability to (a microcontroller with) a CAN protocol controller.

The TJA1042 belongs to the third generation of high-speed CAN transceivers from NXP Semiconductors, offering significant improvements over first- and second-generation devices such as the TJA1040.

The TJA1042 offers improved electromagnetic compatibility (EMC) and electrostatic discharge (ESD) performance, it features ideal passive behavior to the CAN bus when the supply voltage is off, a very low-current Standby mode with bus wake-up capability, and variants with a VIO pin can be interfaced directly with microcontrollers with supply voltages from 3.3 V to 5 V.

The TJA1042 implements the CAN physical layer as defined in ISO 11898-2:2016 and SAE J2284-1 to SAE J2284-5. This implementation enables reliable communication in the CAN FD fast phase at data rates up to 5 Mbit/s. The TJA1042B and TJA1042C feature shorter propagation delay, supporting larger network topologies.

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Block Diagram

TJA1042

TJA1042 Block Diagram
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Features

General Features

  • Fully ISO 11898-2:2016, SAE J2284-1 to SAE J2284-5 and SAE J1939-14 compliant
  • Timing guaranteed for data rates up to 5 Mbit/s in the CAN FD fast phase
  • Suitable for 12 V and 24 V systems
  • Low Electromagnetic Emission (EME) and high Electromagnetic Immunity (EMI), according to proposed EMC Standards IEC 62228-3 and SAE J2962-2
  • Variants with a VIO pin allow for direct interfacing with 3.3 V to 5 V microcontrollers
  • Shorter propagation delay on the TJA1042B and TJA1042C variants supports larger network topologies
  • SPLIT voltage output on TJA1042T and TJA1042CT for stabilizing the recessive bus level
  • Dark green product (halogen free and Restriction of Hazardous Substances (RoHS) compliant)
  • AEC-Q100 qualified

Predictable and Fail-Safe Behavior

  • Very low-current Standby mode with host and bus wake-up capability
  • Functional behavior predictable under all supply conditions
  • Transceiver disengages from the bus when not powered up (zero loads)
  • Transmit Data (TXD) dominant time-out function
  • Bus-dominant time-out function in Standby mode
  • Undervoltage detection on pins VCC and VIO

Protection

  • High ESD handling capability on the bus pins (±8 kV)
  • High voltage robustness on CAN pins (±58 V)
  • Bus pins protected against transients in automotive environments
  • Thermally protected

Product Longevity Program

  • These products are included in the NXP Product Longevity Program ensuring a stable supply of products for your embedded designs. The TJA1042B and TJA1042C are included in the 15-year program

Part numbers include: TJA1042BT, TJA1042CT, TJA1042T, TJA1042TK.

Comparison Table

Part Number New Generation Recommendation
TJA1042T,112 TJA1044GT/1Z
TJA1042T,118 TJA1044GT/1Z
TJA1042T/1J TJA1044GT/1Z
TJA1042T/3,112 TJA1044GT/3Z
TJA1042T/3,118 TJA1044GT/3Z
TJA1042T/3/1J TJA1044GT/3Z
TJA1042T/3/CM,118 TJA1044GT/3Z
TJA1042T/CM,118 TJA1044GT/1Z
TJA1042TK/3,118 TJA1044GTK/3Z
TJA1042TK/3/1J TJA1044GTK/3Z

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