TCA9554A Datasheet, PDF (2/33 Pages) Texas Instruments – LOW VOLTAGE 8-BIT I2C AND SMBus I/O EXPANDER

TCA9554A
SCPS196 – DECEMBER 2010
www.ti.com
DESCRIPTION/ORDERING INFORMATION (CONTINUED)
INT can be connected to the interrupt input of a microcontroller. By sending an interrupt signal on this line, the
remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via
the I²C bus. Thus, the TCA9554A can remain a simple slave device.
The device's outputs (latched) have high-current drive capability for directly driving LEDs and low current
consumption.
Three hardware pins (A0, A1, and A2) are used to program and vary the fixed I²C address and allow up to eight
devices to share the same I²C bus or SMBus.
The TCA9554A is pin-to-pin and I²C address compatible with the PCF8574A. However, software changes are
required, due to the enhancements in the TCA9554A over the PCF8574A.
The TCA9554A and PCA9554 are identical except for their fixed I²C address. This allows for up to 16 of these
devices (8 of each) on the same I²C/SMBus.
T_A
–40°C to 85°C
TSSOP – PW
ORDERING INFORMATION
PACKAGE^{(1) (2)}
ORDERABLE PART NUMBER
Reel of 2000
TCA9554APWR
TOP-SIDE MARKING
PW554A
(1) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
(2) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
2
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