PCA9534

Features:

• 8-bit I²C GPIO
• Operating power supply voltage range of 2.3 V to 5.5 V
• 5 V tolerant I/Os
• Polarity inversion register
• Active low interrupt output
• Low stand-by current
• Noise filter on SCL/SDA inputs
• No glitch on power-up
• Internal power-on reset
• 8 I/O pins which default to 8 inputs
• 0 kHz to 400 kHz clock frequency
• ESD protection exceeds 2000 V HBM per JESD22-A114,200 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101
• Latch-up testing is done to JESDEC Standard JESD78 which exceeds 100 mA
• Offered in three different packages: SO16, TSSOP16, and HVQFN16


Pinout




Specifications

SYMBOL	PARAMETER	CONDITIONS	MIN	MAX	UNIT
VDD	Supply voltage		-0.5	6.0	V
VI/O	DC input current on an I/O		_	±20	mA
II/O	DC output current on an I/O		VSS 0.5	5.5	v
II	DC input current		-	±50	mA
IDD	Supply current		-	85	mA
ISS	Supply current		-	100	mA
Ptot	Total power dissipation		-	200	mW
Tstg	Storage temperature range		-65	+150
Tamb	Operating ambient temperature		-40	+85

Description

The PCA9534 is a16-pin CMOS device that provide 8 bits of General Purpose parallel Input/Output (GPIO) expansion for
I²C/SMBus applications of PCA9534 and was developed to enhance the Philipsfamily of I²C I/O expanders. The improvements of PCA9534 include higher drivecapability, 5V I/O tolerance, lower supply current, individual I/Oconfiguration, 400 kHz clock frequency, and smaller packaging. I/Oexpanders provide a simple solution when additional I/O is neededfor ACPI power switches, sensors, pushbuttons, LEDs, fans, etc.

The PCA9534 consist of an 8-bit Configuration register (Input orOutput selection); 8-bit Input register, 8-bit Output register and an8-bit Polarity inversion register PCA9534 (Active HIGH or Active LOWoperation). The system master can enable the I/Os as either inputsor outputs by writing to the I/O configuration bits. The data for eachInput or Output of PCA9534 is kept in the corresponding Input or Output register.The polarity of the input port register can be inverted with the Polarity Inversion Register. All registers can be read by the systemmaster. Although pin-to-pin and I²C address compatible with the PCF8574 series, software changes are required due to the enhancements and are discussed in Application Note AN469.

The PCA9534 is identical to the PCA9554 except for the removal of the internal I/O pull-up resistor which greatly reduces power consumption when the I/Os are held LOW.

The PCA9534 open-drain interrupt 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 haschanged. The power-on reset sets the registers to their default values and initializes the device state machine.

Three hardware pins (A0, A1, A2) vary the fixed I²C address and allow up to eight devices to share the same I²C/SMBus.