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AN11593
How to design in and program the PCA9641 I
2
C arbiter
Rev. 1 — 23 October 2014 Application note
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Keywords Fast-mode Plus (Fm+) I2C-bus, 2-to-1 I2C-bus multiplexer, recover stuck
I2C-bus, I2C-bus collision avoidance, I2C.
Abstract The PCA9641 is highly integrated and smart design for 2-1 I
2
C-bus
multiplexer. It is used in a system that needs two masters sharing the
same slave devices. The internal switch is programmed by the masters
but it will not switch in a middle of the task once owned by the master. The
PCA9641 sends an interrupt to the master requesting the bus when the
downstream bus is available. If the down-stream bus is hung, the
initial/recovery function clears the downstream bus and sends status to
both masters. Low voltage I
2
C masters can communicate with higher
voltage level of slave devices
