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  4-Channel I2C Multiplexer Provides Address Expansion, Bus Buffering and Fault Management &mdash LT Journal
  PDF, 356 Kb, 档案已发布: Mar 28, 2006
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  DESIGN FEATURES 4-Channel I2C Multiplexer Provides
  Address Expansion, Bus Buffering
  by John Ziegler
  and Fault Management
  Introduction
  As data processing, mass storage
  and communications systems have
  grown, the size and complexity of
  the subsystems employed to transfer
  information such as temperature, fan
  speed, system voltages and Vital Product Data (VPD, board identification,
  for example) have grown in proportion. This information is most often
  transferred through two-wire serial
  buses, such as I2C or SMBus.
  Several practical problems can arise
  in the design of these systems, especially as they become large. First, many
  devices, such as Small Form Factor
  Pluggable optical modules (SFPs) have
  hard-wired I2C addresses, preventing
  the use of multiple such devices due
  to address conflict. Second, as the
  variety of devices increases and more
  I/O cards are hot-swapped into and …

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• Interface > I2C and SMBus Bus Buffers and Accelerators