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PCA9673: Remote 16-bit I/O expander for Fm+ I2C-bus with interrupt and reset

The PCA9673 provides general purpose remote I/O expansion for most microcontroller families via the two-line bidirectional bus (I²C-bus) and is a part of the Fast-mode Plus family.

The PCA9673 is a drop in upgrade for the PCF8575 providing higher Fast-mode Plus (Fm+) I²C-bus speeds (1 MHz versus 400 kHz) so that the output can support PWM dimming of LEDs, higher I²C-bus drive (30 mA versus 3 mA) so that many more devices can be on the bus without the need for bus buffers, higher total package sink capacity (400 mA versus 100 mA) that supports having all 25 mA LEDs on at the same time and more device addresses (16 versus 8) are available to allow many more devices on the bus without address conflicts.

The difference between the PCA9673 and the PCF8575 is that the A2 address pin is replaced by a RESET input on the PCA9673.

The device consists of a 16-bit quasi-bidirectional port and an I²C-bus interface. The PCA9673 has a low current consumption and includes latched outputs with 25 mA high current drive capability for directly driving LEDs.

It also possesses an interrupt line (INT) which can be connected to the interrupt logic of the 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 I²C-bus.

The internal Power-On Reset (POR), hardware reset pin (RESET) or software reset sequence initializes the I/Os as inputs.

PCA9673: Product Block Diagram

Outline 3d SOT137-1

Data Sheets (1)

Application Notes (3)

Users Guides (4)

Brochures (3)

Package Information (3)

Packing (3)

Supporting Information (2)

IBIS Model

• PCA9673 IBIS model (REV 1.0) ZIP PCA9673_1 8/18/2014

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
PCA9673D		SOT137-1	SO-SOJ-WAVE	Reel 13" Q1/T1	Active	PCA9673D,118 (9352 835 55118)	PCA9673D	PCA9673D		Always Pb-free	0.0	2.0	5E8	1	1
				Bulk Pack	Active	PCA9673D,112 (9352 835 55112)	PCA9673D	PCA9673D		Always Pb-free	0.0	2.0	5E8	1	1
PCA9673PW		SOT355-1	SSOP-TSSOP-VSO-WAVE	Reel 13" Q1/T1	Active	PCA9673PW,118 (9352 835 58118)	PCA9673PW	PCA9673PW		Always Pb-free	0.0	2.0	5E8	1	1
				Bulk Pack	Active	PCA9673PW,112 (9352 835 58112)	PCA9673PW	PCA9673PW		Always Pb-free	0.0	2.0	5E8	1	1
PCA9673BS		SOT616-1		Reel 13" Q1/T1	Active	PCA9673BS,118 (9352 835 87118)	9673	PCA9673BS		Always Pb-free	0.0	2.0	5E8	1	1