PCAL9554B datasheet(1/42 Pages) NXP

Numer części	PCAL9554B

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

PDF	42 Pages

Scroll/Zoom	100%

Producent	NXP [NXP Semiconductors]

Strona internetowa	http://www.nxp.com

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1.

General description

The PCAL9554B and PCAL9554C are a low-voltage 8-bit General Purpose Input/Output

(GPIO) expanders with interrupt and weak pull-up for I2C-bus/SMBus applications. The

only difference between the PCAL9554B and PCAL9554C is their I2C-bus fixed address,

allowing a larger number of the same device on the I2C-bus with no chance of address

conflicts. 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

allows the PCAL9554B/PCAL9554C to interface with next-generation microprocessors

and microcontrollers where supply levels are dropping down to conserve power.

The PCAL9554B/PCAL9554C contains the PCA9554A register set of four 8-bit

Configuration, Input, Output, and Polarity Inversion registers, and additionally, the

PCAL9554B/PCAL9554C has Agile I/O, which are additional features specifically

designed to enhance the I/O. These additional features are: programmable output drive

strength, latchable inputs, programmable pull-up/pull-down resistors, maskable interrupt,

interrupt status register, programmable open-drain or push-pull outputs.

The PCAL9554B is a pin-for-pin replacement for the PCA9554, while the PCAL9554C

replaces the PCA9554A, however both versions power-up with all I/O interrupted masked.

This mask default allows for a board bring-up free of spurious interrupts at power-up.

The PCAL9554B/PCAL9554C 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 PCAL9554B or

PCAL9554C can remain a simple slave device.

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

low device current.

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 PCAL9554B and PCAL9554C differ only

in their base I2C-bus addresses permitting a total of 16 of the same devices on the

I2C-bus, minimizing the chance of address conflict, even in the most complex system.

PCAL9554B; PCAL9554C

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

Product data sheet

Podobny numer części - PCAL9554B

Producent	Numer części	Arkusz danych	Szczegółowy opis
NXP Semiconductors	PCAL9555A	727Kb / 8P	Smart, simple solutions for the 12 most common design concerns August 2011
	PCAL9555A	2Mb / 46P	Low-voltage 16-bit I2C-bus GPIO with Agile I/O, interrupt and weak pull-up Rev. 1-3 October 2012
	PCAL9555AHF	2Mb / 46P	Low-voltage 16-bit I2C-bus GPIO with Agile I/O, interrupt and weak pull-up Rev. 1-3 October 2012
	PCAL9555APW	2Mb / 46P	Low-voltage 16-bit I2C-bus GPIO with Agile I/O, interrupt and weak pull-up Rev. 1-3 October 2012

More results

Podobny opis - PCAL9554B

Producent	Numer części	Arkusz danych	Szczegółowy opis
NXP Semiconductors	PCA9534	146Kb / 17P	8-bit I2C and SMBus, low power I/O port with interrupt 2004 Sep 30
	PCA9534	163Kb / 25P	8-bit I2C-bus and SMBus low power I/O port with interrupt Rev. 03-6 November 2006
	PCA9554	187Kb / 30P	8-bit I2C-bus and SMBus I/O port with interrupt Rev. 07-13 November 2006
	PCA9554B	2Mb / 36P	Low-voltage 8-bit I2C-bus and SMBus low power I/O port with interrupt, weak pull-up Rev. 1-19 September 2012
	PCA9555A	2Mb / 39P	Low-voltage 16-bit I2C-bus I/O port with interrupt and weak pull-up Rev. 1-11 September 2012
	PCAL9535A	2Mb / 46P	Low-voltage 16-bit I2C-bus I/O port with interrupt and Agile I/O Rev. 1-28 September 2012
	PCAL9555A	2Mb / 46P	Low-voltage 16-bit I2C-bus GPIO with Agile I/O, interrupt and weak pull-up Rev. 1-3 October 2012
	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
	PCA9554D,112	590Kb / 35P	8-bit I2C-bus and SMBus I/O port with interrupt Rev. 9-19 March 2013
	PCA9554PW-T	590Kb / 35P	8-bit I2C-bus and SMBus I/O port with interrupt Rev. 9-19 March 2013

More results

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