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PCA9547 - 8-Channel I2C Bus Multiplexer

Description

The PCA9547 is an octal bidirectional translating multiplexer controlled by the I2C-bus.

The SCL/SDA upstream pair fans out to eight downstream pairs, or channels.

Only one SCx/SDx channel can be selected at a time, determined by the contents of the programmable control register.

Features

  • 1-of-8 bidirectional translating multiplexer.
  • I2C-bus interface logic; compatible with SMBus standards.
  • Active LOW RESET input.
  • 3 address pins allowing up to 8 devices on the I2C-bus.
  • Channel selection via I2C-bus, one channel at a time.
  • Power-up with all channels deselected except Channel 0 which is connected.
  • Low Ron multiplexers.
  • Allows voltage level translation between 1.8 V, 2.5 V, 3.3 V and 5 V buses.
  • No glitch on power-up.
  • Supports hot in.

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Full PDF Text Transcription

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PCA9547 8-channel I2C-bus multiplexer with reset Rev. 4 — 1 April 2014 Product data sheet 1. General description The PCA9547 is an octal bidirectional translating multiplexer controlled by the I2C-bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Only one SCx/SDx channel can be selected at a time, determined by the contents of the programmable control register. The device powers up with Channel 0 connected, allowing immediate communication between the master and downstream devices on that channel. An active LOW reset input allows the PCA9547 to recover from a situation where one of the downstream I2C-buses is stuck in a LOW state.
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