PCA9541A
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 mands 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. The failed master is isolated from the system and does not affect munication between the on-line master and the slave devices on the downstream I2C-bus.
Two versions are offered for different architectures. PCA9541A/01 with channel 0 selected at start-up, and PCA9541A/03 with no channel selected after start-up.
The interrupt outputs are used to provide an indication of which master has control of...
