PCA9541AD View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

Manufacturer

PCA9541AD

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

NXP Semiconductors. 

NXP Semiconductors

PCA9541A

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

10.2 High reliability systems

In a typical multipoint application, shown in Figure 18, the two masters (for example,

primary and back-up) are located on separate I2C-buses that connect to multiple

downstream I2C-bus slave cards/devices via a PCA9541A/01 for non-hot swap

applications to provide high reliability of the I2C-bus.

SCL0

SDA0

SCL1

SDA1

002aae662

Fig 18. High reliability backplane application

I2C-bus commands are sent via the primary or back-up master and either master can take

command of the I2C-bus. 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 will not affect communication between the on-line master and the

slave devices located on the cards.

For even higher reliability in multipoint backplane applications, two dedicated masters can

be used for every card as shown in Figure 19.

SCL0

SDA0

SCL0

SDA0

SCL0

SDA0

SCL0

SDA0

PCA9541A_3

Product data sheet

Fig 19. Very high reliability backplane application

Rev. 03 — 16 July 2009

SCL1

SDA1

SCL1

SDA1

SCL1

SDA1

SCL1

SDA1

002aae663

© NXP B.V. 2009. All rights reserved.

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