TCA9554_15 Datasheet, PDF (22/38 Pages) Texas Instruments – TCA9554 Low Voltage 8-Bit I2C and SMBus Low-Power I/O Expander With Interrupt Output and Configuration Registers

TCA9554
SCPS233D – MARCH 2012 – REVISED AUGUST 2015
9 Application and Implementation
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NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
Figure 24 shows an application in which the TCA9554 can be used.
9.2 Typical Application
V_CC
V_CC
10 kΩ⁽¹⁾ 10 kΩ⁽¹⁾ 10 kΩ
SDA
Master
Controller
SCL
INT
GND
16
VCC
15
SDA
14
SCL
13 _INT
2 kΩ
4
P0
5
P1
P2 ⁶
7
P3
TCA9554
9
P4
10
P5
3
A2
2
A1
1 _A0
P6 11
P7 12
Subsystem 1
(e.g., temperature sensor)
INT
RESET
Subsystem 2
(e.g., counter)
A
ENABLE
B
Controlled Device
(e.g., CBT device)
GND
8
ALARM
Subsystem 3
(e.g., alarm system)
V_CC
(1) The SCL and SDA pins must be tied directly to VCC because if SCL and SDA are tied to an auxiliary power supply
that could be powered on while VCC is powered off, then the supply current, ICC, will increase as a result.
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 24. Application Schematic
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