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The I2C address space in the standard 7-bit scheme provides

  • A.about 112 usable addresses
  • B.exactly 128 usable addresses
  • C.256 usable addresses
  • D.1024 usable addresses

Answer: A

Seven bits give 128 combinations, of which sixteen are reserved for special purposes, leaving 112. Two devices with the same fixed address on one bus is a common and awkward problem, solved by a bus multiplexer or a second bus.

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