PCA9555
REMOTE 16-BIT I2C AND SMBus I/O EXPANDER
WITH INTERRUPT OUTPUT AND CONFIGURATION REGISTERS
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SCPS131D–AUGUST 2005–REVISED OCTOBER 2006
APPLICATION INFORMATION
Figure 15 shows an application in which the PCA9555 can be used.
Subsystem 1
(e.g., Temperature
Sensor)
INT
V
CC
(5 V)
Subsystem 2
(e.g., Counter)
24
2 kW
V
CC
10 kW 10 kW
10 kW 10 kW
V
CC
RESET
A
22
23
4
P00
SCL
SDA
INT
SCL
5
Master
Controller
P01
P02
P03
SDA
INT
6
7
1
GND
ENABLE
8
9
P04
P05
B
PCA9555
V
CC
10
Controlled Switch
(e.g., CBT Device)
P06
11
13
14
15
16
17
18
19
20
P07
P10
P11
P12
P13
P14
P15
P16
P17
3
A2
2
ALARM
A1
A0
Keypad
Subsystem 3
(e.g., Alarm)
21
GND
12
A. Device address is configured as 0100100 for this example.
B. P00, P02, and P03 are configured as outputs.
C. P01, P04–P07, and P10–P17 are configured as inputs.
D. Pin numbers shown are for DB, DBQ, DGV, DW, and PW packages.
Figure 15. Typical Application
22
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