PCA9545A_45B_45C_7

© NXP B.V. 2009. All rights reserved.

Product data sheet

Rev. 07 — 19 June 2009

13 of 28

NXP Semiconductors

PCA9545A/45B/45C

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 16. Typical application

PCA9545A

SD0

SC0

A1

A0

SDA

SCL

RESET

002aab171

SDA

SCL

channel 0

V = 2.7 V to 5.5 V

INT

INT0

SD1

SC1

channel 1

V = 2.7 V to 5.5 V

INT1

SD2

SC2

channel 2

V = 2.7 V to 5.5 V

INT2

SD3

SC3

channel 3

V = 2.7 V to 5.5 V

INT3