PCA9541_7 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 7.1 — 24 June 2015 24 of 42
NXP Semiconductors
PCA9541
2-to-1 I
2
C-bus master selector with interrupt logic and reset
10. Application design-in information
10.1 Specific applications
The PCA9541 is a 2-to-1 I
2
C-bus master selector designed for dual master, high reliability
I
2
C-bus applications, where continuous maintenance and control monitoring is required
even if one master fails or its controller card is removed for maintenance. The PCA9541
can also be used in other applications, such as where masters share the same resource
but cannot share the same bus, as a gatekeeper multiplexer in long single bus
applications or as a bus initialization/recovery device.
Fig 17. Typical application
PCA9541
SCL_MST0
SDA_MST0
INT0
3.3 V
MASTER 0
002aab611
SCL0
SDA0
INT0 INT_IN
A3
A2
A1
V
DD
A0
V
SS
V
DD
RESET0
V
SS
SLAVE 1
SDA SCL
SLAVE 2
SDA SCL
INT
SLAVE 3
SDA SCL
SDA_SLAVE
SCL_SLAVE
SCL_MST1
SDA_MST1
INT1
3.3 V
MASTER 1
SCL1
SDA1
INT1
V
DD
RESET1
V
SS
RESET
SLAVE CARD