Datasheet

PCA9539_PCA9539R All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 8 — 26 November 2014 17 of 38
NXP Semiconductors
PCA9539; PCA9539R
16-bit I
2
C-bus and SMBus low power I/O port with interrupt and reset
8. Application design-in information
Device address configured as 1110 100X for this example.
IO0_0, IO0_2, IO0_3 configured as outputs.
IO0_1, IO0_4, IO0_5 configured as inputs.
IO0_6, IO0_7 and (IO1_0 to IO1_7) configured as inputs.
Fig 19. Typical application
PCA9539
IO0_0
IO0_1
SCL
SDA
V
DD
(5 V)
MASTER
CONTROLLER
SCL
SDA
INT
IO0_2
V
DD
A1
A0
V
DD
V
SS
INT
10 kΩ
SUB-SYSTEM 1
(e.g., temp sensor)
IO0_3
INT
SUB-SYSTEM 2
(e.g., counter)
RESET
controlled
switch
(e.g., CBT device)
V
DD
A
B
enable
SUB-SYSTEM 3
(e.g., alarm system)
ALARM
IO0_4
IO0_5
IO0_6
10 DIGIT
NUMERIC
KEYPAD
V
SS
002aad730
10 kΩ10 kΩ 2 kΩ 100 kΩ
(×3)
IO0_7
IO1_0
IO1_1
IO1_2
IO1_3
IO1_4
IO1_5
IO1_6
IO1_7
RESET RESET
10 kΩ