PCA9544A

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Product data sheet

Rev. 5 — 23 April 2014

12 of 31

NXP Semiconductors

PCA9544A

4-channel I2C-bus multiplexer with interrupt logic

8.

Application design-in information

(1) If the device generating the interrupt has an open-drain output structure or can be 3-stated,

a pull-up resistor is required.

If the device generating the interrupt has a totem pole output structure and cannot be 3-stated,

a pull-up resistor is not required.

The interrupt inputs should not be left floating.

Fig 14. Typical application

PCA9544A

SD0

SC0

A1

A0

VSS

SDA

SCL

INT

VDD = 3.3 V

VDD = 2.7 V to 5.5 V

I2C-bus/SMBus master

002aae298

SDA

SCL

channel 0

V = 2.7 V to 5.5 V

A2

INT0

(1)

SD1

SC1

channel 1

V = 2.7 V to 5.5 V

INT1

(1)

SD2

SC2

channel 2

V = 2.7 V to 5.5 V

INT2

(1)

SD3

SC3

channel 3

V = 2.7 V to 5.5 V

INT3

(1)