NXP – Ethernet PHY complies with automotive network protocols

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NXP Semiconductors’ TJA1100 is an OPEN Alliance BroadR-Reach®-compliant Ethernet transceiver for use in high- bandwidth automotive network systems.

The device provides a 100Mbits/s Transmit and Receive capability over a single Unshielded Twisted Pair (UTP) cable, supporting a cable length of at least 15m. The TJA1100 has been designed to minimise power consumption and system costs, while providing the robust characteristics required in automotive applications.

In particular, it provides for reduced power consumption by adapting the transmitter pulse’s amplitude to suit the length of cable over which the signals are to be transmitted.

The device’s operation is optimised for capacitive signal coupling to the UTP pair lines. To comply with automotive EMC requirements, a common- mode choke is typically inserted into the signal path. The TJA1100 may also be paired with NXP’s PESD2ETH-X to provide system-level protection against ESD for BroadR-Reach equipment.

Communication with the media access control unit may be provided via the TJA1100’s Media Independent Interface (MII) or Reduced MII (RMII).

FEATURES

  • Integrated PAM-3 pulse shaping for low RF emissions
  • Adaptive Receive equaliser
  • Low-power sleep mode with local wake-up
  • Remote wake-up via bus lines
  • Cabling error diagnosis
  • ±6kV ESD protection on MDI pins
  • Operating-temperature range: -40°C to 125°C
  • AEC-Q100 qualified

APPLICATIONS

  • In-car Ethernet networks
  • Camera links
  • Driver-assistance systems
  • Backbone networks

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