Datasheet

TCA9554
SCPS233A –NOVEMBER 2011–REVISED MARCH 2012 www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
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 I
2
C bus. Thus, the TCA9554 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 I
2
C address and allow up to eight
devices to share the same I
2
C bus or SMBus.
The TCA9554 is pin-to-pin and I
2
C address compatible with the PCF8574A. However, software changes are
required, due to the enhancements in the TCA9554 over the PCF8574A.
The TCA9554 and TCA9554A are identical except for their fixed I
2
C address. This allows for up to 16 of these
devices (8 of each) on the same I
2
C/SMBus.
ORDERING INFORMATION
T
A
PACKAGE
(1) (2)
ORDERABLE PART NUMBER TOP-SIDE MARKING
–40°C to 85°C TSSOP – PW Reel of 2000 TCA9554PWR PW554
(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.
Table 1. TERMINAL FUNCTIONS
NO.
NAME DESCRIPTION
TSSOP (PW) μQFN (RSV)
1 15 A0 Address input. Connect directly to V
CC
or ground.
2 16 A1 Address input. Connect directly to V
CC
or ground.
3 1 A2 Address input. Connect directly to V
CC
or ground.
P-port input/output. Push-pull design structure. At power-on, P0 is
4 2 P0
configured as an input.
P-port input/output. Push-pull design structure. At power-on, P1 is
5 3 P1
configured as an input.
P-port input/output. Push-pull design structure. At power-on, P2 is
6 4 P2
configured as an input.
P-port input/output. Push-pull design structure. At power-on, P3 is
7 5 P3
configured as an input.
8 6 GND Ground
P-port input/output. Push-pull design structure. At power-on, P4 is
9 7 P4
configured as an input.
P-port input/output. Push-pull design structure. At power-on, P5 is
10 8 P5
configured as an input.
P-port input/output. Push-pull design structure. At power-on, P6 is
11 9 P6
configured as an input.
P-port input/output. Push-pull design structure. At power-on, P7 is
12 10 P7
configured as an input.
13 11 INT Interrupt output. Connect to V
CC
through a pullup resistor.
14 12 SCL Serial clock bus. Connect to V
CC
through a pullup resistor.
15 13 SDA Serial data bus. Connect to V
CC
through a pullup resistor.
16 14 V
CC
Supply voltage
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