Datasheet

PCA9534
SCPS124G –SEPTEMBER 2006–REVISED JUNE 2010 www.ti.com
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 PCA9534 can remain a simple slave device.
The device's outputs (latched) have high-current drive capability for directly driving LEDs. It has 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 PCA9534 is pin-to-pin and I
2
C address compatible with the PCF8574. However, software changes are
required due to the enhancements in the PCA9534 over the PCF8574.
The PCA9534 is a low-power version of the PCA9554. The only difference between the PCA9534 and PCA9554
is that the PCA9534 eliminates an internal I/O pullup resistor, which dramatically reduces power consumption in
the standby mode when the I/Os are held low.
The PCA9534A and PCA9534 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 bus.
ORDERING INFORMATION
T
A
PACKAGE
(1) (2)
ORDERABLE PART NUMBER TOP-SIDE MARKING
QFN – RGT Reel of 3000 PCA9534RGTR PREVIEW
QFN – RGV Reel of 2500 PCA9534RGVR PD534
Tube of 40 PCA9534DW
SOIC – DW PCA9534
Reel of 2000 PCA9534DWR
–40°C to 85°C Reel of 2000 PCA9534DBR
SSOP – DB PD534
Tube of 80 PCA9534DBT
Tube of 90 PCA9534PW
TSSOP – PW PD534
Reel of 2000 PCA9534PWR
TVSOP – DGV Reel of 2000 PCA9534DGVR PD534
(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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