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PCA9541A - 2-to-1 I2C-bus master selector

General Description

The PCA9541A is a 2-to-1 I2C-bus master selector designed for high reliability dual master I2C-bus applications where system operation is required, even when one master fails or the controller card is removed for maintenance.

Key Features

  • 2-to-1 bidirectional master selector.
  • I2C-bus interface logic; compatible with SMBus standards.
  • PCA9541A/01 powers up with Channel 0 selected.
  • PCA9541A/03 powers up with no channel selected and either master can take control of the bus.
  • Active LOW interrupt input.
  • 2 active LOW interrupt outputs.
  • Active LOW reset input.
  • 4 address pins allowing up to 16 devices on the I2C-bus.
  • Channel selection via I2C-bus.
  • Bus initialization/recovery function.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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PCA9541A 2-to-1 I2C-bus master selector with interrupt logic and reset Rev. 5 — 24 April 2014 Product data sheet 1. General description The PCA9541A is a 2-to-1 I2C-bus master selector designed for high reliability dual master I2C-bus applications where system operation is required, even when one master fails or the controller card is removed for maintenance. The two masters (for example, primary and back-up) are located on separate I2C-buses that connect to the same downstream I2C-bus slave devices. I2C-bus commands are sent by either I2C-bus master and are used to select one master at a time. Either master at any time can gain control of the slave devices if the other master is disabled or removed from the system.