PCA9554BPW datasheet(1/36 Pages) NXP

Part #	PCA9554BPW

Description	Low-voltage 8-bit I2C-bus and SMBus low power I/O port with interrupt, weak pull-up

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Manufacturer	NXP [NXP Semiconductors]

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General description

The PCA9554B and PCA9554C are low-voltage 8-bit General Purpose Input/Output

(GPIO) expanders with interrupt for I2C-bus/SMBus applications. The only difference

between the PCA9554B and PCA9554C is their I2C fixed address allowing a larger

number of the same device on the I2C-bus with no chance of address conflict. NXP I/O

expanders provide a simple solution when additional I/Os are needed while keeping

interconnections to a minimum, for example, in ACPI power switches, sensors,

push buttons, LEDs, fan control, etc.

In addition to providing a flexible set of GPIOs, the wide VDD range of 1.65 V to 5.5 V allow

the PCA9554B/PCA9554C to interface with next-generation microprocessors and

microcontrollers where supply levels are dropping down to conserve power.

The PCA9554B/PCA9554C contain a register set of 8-bit Configuration, Input, Output,

and Polarity Inversion registers.

The PCA9554B is a pin-to-pin replacement for the PCA9554, while the PCA9554C

replaces the PCA9554A. Both of these devices replace other industry-standard part

numbers. More fully-featured parts PCAL9554B and PCAL9554C are also available with

Agile I/O features. See the respective data sheet for more details.

The PCA9554B/PCA9554C open-drain interrupt (INT) 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.

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 I2C-bus. Thus, the

PCA9554B/PCA9554C can remain a simple slave device.

The device outputs have 25 mA sink capabilities for directly driving LEDs while consuming

low device current.

The power-on reset sets the registers to their default values and initializes the device state

machine.

Three hardware pins (A0, A1, A2) select the fixed I2C-bus address and allow up to eight

devices to share the same I2C-bus/SMBus. The PCA9554B and PCA9554C differ only in

their base I2C-bus addresses permitting a total of 16 devices on the I2C-bus, minimizing

the chance for address conflict, even in the most complex system.

PCA9554B; PCA9554C

Low-voltage 8-bit I2C-bus and SMBus low power I/O port with

interrupt, weak pull-up

Rev. 1 — 19 September 2012

Product data sheet

Similar Part No. - PCA9554BPW

Manufacturer	Part #	Datasheet	Description
NXP Semiconductors	PCA9554BS	183Kb / 20P	8-bit I2C and SMBus I/O port with interrupt 2004 Sep 30
	PCA9554BS	187Kb / 30P	8-bit I2C-bus and SMBus I/O port with interrupt Rev. 07-13 November 2006
	PCA9554BS	590Kb / 35P	8-bit I2C-bus and SMBus I/O port with interrupt Rev. 9-19 March 2013
	PCA9554BS,118	590Kb / 35P	8-bit I2C-bus and SMBus I/O port with interrupt Rev. 9-19 March 2013
	PCA9554BS3	187Kb / 30P	8-bit I2C-bus and SMBus I/O port with interrupt Rev. 07-13 November 2006

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Similar Description - PCA9554BPW

Manufacturer	Part #	Datasheet	Description
NXP Semiconductors	PCAL9554B	2Mb / 42P	Low-voltage 8-bit I2C-bus and SMBus low power I/O port with interrupt, weak pull-up and Agile I/O Rev. 2-10 December 2012
	PCA9555A	2Mb / 39P	Low-voltage 16-bit I2C-bus I/O port with interrupt and weak pull-up Rev. 1-11 September 2012
	PCA9534	163Kb / 25P	8-bit I2C-bus and SMBus low power I/O port with interrupt Rev. 03-6 November 2006
	PCAL9555A	2Mb / 46P	Low-voltage 16-bit I2C-bus GPIO with Agile I/O, interrupt and weak pull-up Rev. 1-3 October 2012
	PCA9534	146Kb / 17P	8-bit I2C and SMBus, low power I/O port with interrupt 2004 Sep 30
	PCA9554PW-T	590Kb / 35P	8-bit I2C-bus and SMBus I/O port with interrupt Rev. 9-19 March 2013
	PCA9554D,112	590Kb / 35P	8-bit I2C-bus and SMBus I/O port with interrupt Rev. 9-19 March 2013
	PCAL9538A	2Mb / 43P	Low-voltage 8-bit I2C-bus and SMBus low power I/O port with interrupt, reset and Agile I/O Rev. 2-10 December 2012
	PCA9554	187Kb / 30P	8-bit I2C-bus and SMBus I/O port with interrupt Rev. 07-13 November 2006
	PCA9538	169Kb / 28P	8-bit I2C-bus and SMBus low power I/O port with interrupt and reset Rev. 05-28 May 2009

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