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PCA9541 Datasheet(PDF) 19 Page - NXP Semiconductors

Part # PCA9541
Description  2-to-1 I2C master selector with interrupt logic and reset
PDF  30 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCA9541 Datasheet(HTML) 19 Page - NXP Semiconductors

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Philips Semiconductors
Product data sheet
PCA9541
2-to-1 I2C demultiplexer with interrupt logic and reset
2004 Oct 01
18
TYPICAL APPLICATION
PCA9541
SD1
SC1
A1
A0
SDA_MST0
SCL_MST0
RESET
VDD
3.3 V
MASTER 0
SW02010
SDA0
SCL0
INT0
INT_IN
3.3 V
MASTER 1
RESET0
INT0
SDA1
SCL1
RESET1
INT1
A2
SDA_MST1
SCL_MST1
INT1
VSS
SLAVE 2
SLAVE 1
SLAVE 3
INT
VSS
VSS
VDD
VDD
SDA
SCL
SDA
SCL
SDA
SCL
SLAVE CARD
A3
Figure 16. Typical application
SPECIFIC APPLICATIONS
The PCA9541 is a 2-to-1 I2C master selector designed for dual
master, high reliability I2C 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.
HIGH RELIABILITY SYSTEMS
In a typical multi-point application, shown in Figure 17, the two
masters (e.g., primary and back-up) are located on separate
I2C-buses that connect to multiple downstream I2C-bus slave
cards/devices via a PCA9541/01 for non-hot swap applications or
the PCA9541/02 for hot swap applications to provide high reliability
of the I2C-bus.
SR02462
SCL0
SDA0
SCL1
SDA1
Figure 17. High Reliability Backplane Application



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