ELM329 IC from Elm Electronics

The ELM329 is the newest OBD IC from Elm Electronics. It takes the CAN features from the ELM327, and adds several other features:

  • CAN periodic (wakeup) messages
  • Three more user controllable protocols (including 500 kbps J1939)
  • Single wire CAN transceiver controls
  • Some general purpose inputs and an output
  • The ability to send an arbitrary CAN message at any time
  • An expanded and more friendly CRA function
  • An active LED

The IC has slightly better performance, and is software compatible with the ELM327.