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Reducing the I2C pull-up resistance

  • A.has no effect
  • B.speeds the rise time at the cost of more current
  • C.slows the rise time and saves current
  • D.raises the maximum number of devices on the bus

Answer: B

The rise is an RC exponential against the bus capacitance, so a smaller resistor charges it faster and draws more current when a device pulls low. Choosing it is the standard trade between speed and power on an I2C bus.

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