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PCA9541 Datasheet 2-to-1 I2C-bus master selector

Manufacturer: NXP Semiconductors

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General Description

The PCA9541 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.

Overview

PCA9541 2-to-1 I2C-bus master selector with interrupt logic and reset Rev.

7.1 — 24 June 2015 Product data sheet 1.

Key Features

  • 2-to-1 bidirectional master selector.
  • I2C-bus interface logic; compatible with SMBus standards.
  • PCA9541/01 powers up with Channel 0 selected.
  • PCA9541/03 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.

More Datasheets from NXP Semiconductors

Part Number Description
PCA9541A 2-to-1 I2C-bus master selector
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PCA9543B 2-channel I2C-bus switch
PCA9543C 2-channel I2C-bus switch
PCA9549 Octal bus switch
PCA9502 8-bit I/O expander
PCA9506 40-bit I2C-bus I/O port
PCA9507 2-wire serial bus extender
PCA9510A Hot swappable I2C-bus and SMBus bus buffer