Datasheet

APPLICATION INFORMATION
P00
P01
P02
P03
P04
P05
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 k 10 kΩ 10 kΩ 10 kΩ
2 kΩ
INT
Subsystem 1
(e.g., Temperature
Sensor)
Subsystem 2
(e.g., Counter)
TCA9539
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
2
21
12
24
Ω
100 kΩ
100 kΩ 100 kΩ
RESET
3
V
CC
Ω
TCA9539
SCPS202A – AUGUST 2009 – REVISED SEPTEMBER 2009 ........................................................................................................................................... www.ti.com
Figure 15 shows an application in which the TCA9539 can be used.
A. Device address is configured as 1110100 for this example.
B. P00, P02, and P03 are configured as outputs.
C. P01 and P04 to P17 are configured as inputs.
D. Pin numbers shown are for the PW package.
Figure 15. Typical Application
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