Datasheet

PCA9545A_45B_45C All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 9 — 5 May 2014 13 of 32
NXP Semiconductors
PCA9545A/45B/45C
4-channel I
2
C-bus switch with interrupt logic and reset
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
V
SS
SDA
SCL
RESET
V
DD
= 3.3 VV
DD
= 2.7 V to 5.5 V
I
2
C-bus/SMBus master
002aab171
SDA
SCL
channel 0
V = 2.7 V to 5.5 V
INT INT0
see note
(1)
SD1
SC1
channel 1
V = 2.7 V to 5.5 V
INT1
see note
(1)
SD2
SC2
channel 2
V = 2.7 V to 5.5 V
INT2
see note
(1)
SD3
SC3
channel 3
V = 2.7 V to 5.5 V
INT3
see note
(1)