The PCA9544APW is a 4-channel I2C-bus Multiplexer with interrupt logic controlled via the I2C-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 I2C-bus state machine with no channels selected.
- 4 Active low interrupt inputs
- Active low interrupt output
- 4 Address pins allowing up to 8 devices on the I2C-bus
- Power-up with all switch channels deselected
- Low RON switches
- No glitch on power-up
- Supports hot insertion
- Low standby current
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