The PCA9545A/45B/45C is a quad bidirectional translating switch controlled via the
I2C-bus. The SCL/SDA upstream pair fans out to four downstream pairs, or channels. Any
individual SCx/SDx channel or combination of channels can be selected, determined by
the contents of the programmable control register. Four interrupt inputs, INT0 to INT3, one
for each of the downstream pairs, are provided. One interrupt output, INT, acts as an AND
of the four interrupt inputs.
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