Datasheet

TCA9535
SCPS201A –AUGUST 2009– REVISED SEPTEMBER 2009 www.ti.com
DESCRIPTION/ORDERING INFORMATION (CONTINUED)
The TCA9535 open-drain interrupt (INT) output is activated when any input state differs from its corresponding
Input Port register state and is used to indicate to the system master that an input state has changed.
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 TCA9535 can remain a simple slave device.
The device outputs (latched) have high-current drive capability for directly driving LEDs. The device has low
current consumption.
Although pin-to-pin and I
2
C address compatible with the PCF8575, software changes are required due to the
enhancements.
The TCA9535 is identical to the PCA9555, except for the removal of the internal I/O pullup resistor, which greatly
reduces power consumption when the I/Os are held low.
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 fixed I
2
C address of the TCA9535 is the same as the
PCA9555, PCF8575, PCF8575C, and PCF8574, allowing up to eight of these devices in any combination to
share the same I
2
C bus or SMBus.
ORDERING INFORMATION
T
A
PACKAGE
(1) (2)
ORDERABLE PART NUMBER TOP-SIDE MARKING
TSSOP – PW Reel of 2000 TCA9535PWR PW535
–40°C to 85°C
QFN – RTW Reel of 3000 TCA9535RTWR PW535
(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.
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Product Folder Link(s): TCA9535