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The peripheral to look for when a design must survive electrical noise on a long bus between two enclosures is

  • A.SPI, whose clock is supplied by the master
  • B.a parallel port, which needs no protocol at all
  • C.CAN, with an external transceiver
  • D.I2C, whose open-drain outputs tolerate noise well

Answer: C

Differential signalling, bit-level arbitration and a well-defined error and retransmission scheme are what make CAN suit that environment. I2C is a board-level bus and is notoriously intolerant of noise and cable capacitance.

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