PCA9544APW,112 (NXP)

The PCA9544APW is a 4-channel I?C-bus Multiplexer with interrupt logic controlled via the I?C-bus. The SCL/SDA upstream pair fans out to four SCx/SDx downstream pairs or channels. Only one SCx/SDx channel is selected at a time, determined by the contents of the programmable control register. Four interrupt inputs, INT0 to INT3, one for each of the SCx/SDx downstream pairs, are provided. One interrupt output, INT which acts as an AND of the four interrupt inputs, is provided. A power-on reset function puts the registers in their default state and initializes the I?C-bus state machine with no channels selected.