Datasheet

PCA9544A All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 5 — 23 April 2014 12 of 31
NXP Semiconductors
PCA9544A
4-channel I
2
C-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
V
SS
SDA
SCL
INT
V
DD
= 3.3 V
V
DD
= 2.7 V to 5.5 V
I
2
C-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)