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PCA9534: 8-bit I2C-bus and SMBus low power I/O port with interrupt

The PCA9534 is a 16-pin CMOS device that provide 8 bits of General Purpose parallel Input/Output (GPIO) expansion for I²C-bus/SMBus applications and was developed to enhance the NXP Semiconductors family of I²C-bus I/O expanders. The improvements include higher drive capability, 5 V I/O tolerance, lower supply current, individual I/O configuration, 400 kHz clock frequency, and smaller packaging. I/O expanders provide a simple solution when additional I/O is needed for ACPI power switches, sensors, push buttons, LEDs, fans, etc.

The PCA9534 consists of an 8-bit Configuration register (Input or Output selection); 8-bit Input register, 8-bit Output register and an 8-bit Polarity Inversion register (active HIGH or active LOW operation). The system master can enable the I/Os as either inputs or outputs by writing to the I/O configuration bits. The data for each input or output 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 system master. Although pin-to-pin and I²C-bus 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 has changed. 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-bus address and allow up to eight devices to share the same I²C-bus/SMBus.

PCA9534: Product Block Diagram

sot629-1_3d

Data Sheets (1)

Application Notes (3)

Users Guides (4)

Brochures (4)

Package Information (4)

Packing (5)

Supporting Information (3)

Design Support

• Expert mode sample code for 8-bit Totem Pole (REV 1.0) TXT 8-BIT-TOTEM-POLE-READ-WRITE 12/10/2014

IBIS Model

• PCA9534 IBIS model (REV 1.0) ZIP PCA9534_1 8/26/2014

Ordering Information

Package Information

Product ID	Package Description	Outline Version	Reflow/Wave Soldering	Packing	Product Status	Part NumberOrdering code(12NC)	Marking	Chemical Content	RoHS / Pb Free / RHF	LeadFree Conversion Date	EFR	IFR(FIT)	MTBF(hour)	MSL	MSL LF
PCA9534PW		SOT403-1	SSOP-TSSOP-VSO-WAVE	Reel 13" Q1/T1	Active	PCA9534PW,118 (9352 750 51118)	PCA9534	PCA9534PW		week 48, 2004	0.0	2.0	5E8	1	1
				Bulk Pack	Active	PCA9534PW,112 (9352 750 51112)	PCA9534	PCA9534PW		week 48, 2004	0.0	2.0	5E8	1	1
PCA9534D		SOT162-1	SO-SOJ-REFLOW SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE	Bulk Pack	Active	PCA9534D,112 (9352 750 49112)	PCA9534D	PCA9534D		week 45, 2004	0.0	2.0	5E8	1	1
				Reel 13" Q1/T1 in Drypack	Active	PCA9534D,518 (9352 750 49518)	PCA9534D	PCA9534D		Always Pb-free	0.0	2.0	5E8	3	3
				Tube in Drypack	Active	PCA9534D,512 (9352 750 49512)	PCA9534D	PCA9534D		Always Pb-free	0.0	2.0	5E8	3	3
				Reel 13" Q1/T1	Active	PCA9534D,118 (9352 750 49118)	PCA9534D	PCA9534D		week 45, 2004	0.0	2.0	5E8	1	1
PCA9534BS		SOT629-1		Reel 13" Q1/T1	Active	PCA9534BS,118 (9352 750 48118)	9534	PCA9534BS		Always Pb-free	0.0	2.0	5E8	1	1
PCA9534BS3		SOT758-1		Reel 13" Q1/T1	Active	PCA9534BS3,118 (9352 830 47118)	P34	PCA9534BS3		Always Pb-free	0.0	2.0	5E8	1	1