Datasheet
Table Of Contents
- FEATURES
- DESCRIPTION/ORDERING INFORMATION
- DESCRIPTION/ORDERING INFORMATION (continued)
- Absolute Maximum Ratings
- Recommended Operating Conditions
- Electrical Characteristics
- I2C Interface Timing Requirements
- Switching Characteristics
- TYPICAL CHARACTERISTICS
- PARAMETER MEASUREMENT INFORMATION
- APPLICATION INFORMATION
- REVISION HISTORY
A2
A1
SDA
SCL
INT
GND
P6
P0
P1
P2
P3
P4
P5
P7
INT
GND
V
CC
V
CC
(5 V)
V
CC
10 k 10 k
10 k
2 k
Master
Controller
TCA9554A
INT
RESET
Subsystem 2
(e.g., Counter)
Subsystem 3
(e.g., Alarm System)
ALARM
Controlled Device
(e.g., CBT Device)
ENABLE
A
B
V
CC
Subsystem 1
(e.g., Temperature Sensor)
SDA
SCL
A0
TCA9554
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SCPS233A –NOVEMBER 2011–REVISED MARCH 2012
APPLICATION INFORMATION
Figure 16 shows an application in which the TCA9554 can be used.
A. Device address is configured as 0100000 for this example.
B. P0, P2, and P3 are configured as outputs.
C. P1, P4, and P5 are configured as inputs.
D. P6 and P7 are not used and have internal 100-kΩ pullup resistors to protect them from floating.
Figure 16. Typical Application
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