Philips Semiconductors
Product data sheet
16-bit I
2
C and SMBus I/O port with interrupt
PCA9555
TYPICAL APPLICATION
V
DD
V
DD
SCL
MASTER
CONTROLLER
SDA
INT
2 kΩ
10 kΩ
10 kΩ
10 kΩ
V
DD
SCL
SDA
INT
I/O0.0
I/O0.1
I/O0.2
I/O0.3
I/O0.4
GND
I/O0.5
ALARM
SUBSYSTEM 3
(e.g. alarm system)
B
ENABLE
SUBSYSTEM 1
(e.g. temp
sensor)
INT
SUBSYSTEM 2
(e.g. counter)
RESET
A
PCA9555
V
DD
I/O0.6
I/O0.7
I/O1.0
I/O1.1
A1
A0
I/O1.2
I/O1.3
I/O1.4
I/O1.5
I/O1.6
V
SS
I/O1.7
10 DIGIT
NUMERIC
KEYPAD
Controlled Switch
(e.g. CBT device)
NOTE:
Device address configured as 1110100 for this example
I/O0.0, I/O0.2, I/O0.3, configured as outputs
I/O0.1, I/O0.4, I/O0.5, configured as inputs
I/O0.6, I/O0.7, and I/O1.0 to I/O1.7 configured as inputs
SW02284
Figure 11. Typical application.
2004 Sep 30
11
PHILIPS [ NXP SEMICONDUCTORS ]
