Datasheet

APPLICATION INFORMATION
P00
P01
P02
P03
P04
P05
A2
A1
A0
A
B
P06
P07
P10
P11
P12
P13
P14
P15
P16
P17
V
CC
V
CC
V
CC
(5 V)
Controlled Switch
(e.g., CBT Device)
GND
INT
SDA
SCL
10 kΩ 10 kΩ 10 k 10 kΩ
2 kΩ
INT
Subsystem 1
(e.g., Temperature
Sensor)
Subsystem 2
(e.g., Counter)
TCA9555
SDA
SCL
INT
GND
Keypad
ALARM
RESET
ENABLE
Subsystem 3
(e.g., Alarm)
Master
Controller
4
5
6
7
8
9
10
11
13
14
15
16
17
18
19
20
22
23
1
3
2
21
12
24
Ω
V
CC
Ω
TCA9555
SCPS200A – JULY 2009 – REVISED JULY 2009 .............................................................................................................................................................. www.ti.com
Figure 15 shows an application in which the TCA9555 can be used.
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 the PW package.
Figure 15. Typical Application
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