Datasheet

PCA9538 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 7 — 26 November 2014 12 of 34
NXP Semiconductors
PCA9538
8-bit I
2
C-bus and SMBus low power I/O port with interrupt and reset
7. Application design-in information
Device address is 1110 000x for this example.
IO0, IO2, IO3 configured as outputs.
IO1, IO4, IO5 configured as inputs.
IO6, IO7 are not used and need 100 k pull-up resistors to protect them from floating.
Fig 11. Typical application
PCA9538
IO0
IO1
SCL
SDA
V
DD
(5 V)
MASTER
CONTROLLER
SCL
SDA
INT
IO2
V
DD
V
DD
V
SS
INT
10 kΩ
SUB-SYSTEM 1
(e.g., temp sensor)
IO3
INT
SUB-SYSTEM 2
(e.g., counter)
RESET
controlled
switch
(e.g., CBT device)
A
B
enable
V
SS
002aae712
10 kΩ10 kΩ 2 kΩ
100 kΩ
(× 3)
RESET RESET
10 kΩ
IO4
IO5
IO6
IO7
A1
A0
SUB-SYSTEM 3
(e.g., alarm system)
ALARM
V
DD