• 简体中文
• English

PCA9672: Remote 8-bit I/O expander for Fm+ I²C-bus with interrupt and reset

The PCA9672 provides general-purpose remote I/O expansion via the two-wire bidirectional I²C‑bus (serial clock (SCL), serial data (SDA)).

The devices consist of eight quasi-bidirectional ports, 1 MHz 30 mA drive I²C‑bus interface, three hardware address inputs and a reset input operating between 2.3 V and 5.5 V. 1 MHz I²C‑bus Fast-mode Plus (Fm+) can support PWM dimming of LEDs, and higher I²C‑bus drive 30 mA allows more devices to be on the bus without the need for bus buffers. The quasi-bidirectional port can be independently assigned as an input to monitor interrupt status or keypads, or as an output to activate indicator devices such as LEDs. The system master can read from the input port or write to the output port through a single register.

The low current consumption of 2.5 μA (typical, static) is great for mobile applications and the latched output ports have 25 mA high current sink drive capability for directly driving LEDs.

The PCA9672 has two hardware address pins, allowing sixteen of each device to be on the same I²C‑bus without the need for bus buffers, so there can be supporting up to 128 I/Os (for example, 128 LEDs).

The active LOW open-drain interrupt output (INT) can be connected to the interrupt logic of the microcontroller and is activated when any input state differs from its corresponding input port register state. It is used to indicate to the microcontroller that an input state has changed and the device needs to be interrogated without the microcontroller continuously polling the input register via the I²C‑bus.

The internal Power-On Reset (POR) and active LOW hardware reset pin (RESET) initialize the I/Os as inputs with a weak internal pull-up 100 μA current source.

PCA9672: Product Block Diagram

Outline 3d SOT403-1

Data Sheets (1)

Application Notes (3)

Users Guides (4)

Brochures (3)

Package Information (3)

Packing (3)

Supporting Information (3)

IBIS Model

• PCA9972 IBIS model (REV 1.0) ZIP PCA9672_1 8/13/2014

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
PCA9672PW		SOT403-1	SSOP-TSSOP-VSO-WAVE	Reel 13" Q1/T1	Active	PCA9672PW,118 (9352 827 47118)	PCA9672	PCA9672PW		Always Pb-free	0.0	2.0	5E8	1	1
				Bulk Pack	Active	PCA9672PW,112 (9352 827 47112)	PCA9672	PCA9672PW		Always Pb-free	0.0	2.0	5E8	1	1
PCA9672BS		SOT758-1		Reel 13" Q1/T1	Active	PCA9672BS,118 (9352 827 45118)	672	PCA9672BS		Always Pb-free	0.0	2.0	5E8	1	1
PCA9672D		SOT162-1	SO-SOJ-REFLOW SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE	Reel 13" Q1/T1 in Drypack	Active	PCA9672D,518 (9352 827 46518)	PCA9672D	PCA9672D		Always Pb-free	0.0	2.0	5E8	1	2
				Tube in Drypack	Active	PCA9672D,512 (9352 827 46512)	PCA9672D	PCA9672D		Always Pb-free	0.0	2.0	5E8	1	2