PCAL9535APW datasheet(1/46 Pages) NXP

Part #	PCAL9535APW

Description	Low-voltage 16-bit I2C-bus I/O port with interrupt and Agile I/O

PDF	46 Pages

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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General description

The PCAL9535A is a low-voltage 16-bit General Purpose Input/Output (GPIO) expander

with interrupt and reset for I2C-bus/SMBus applications. 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 PCAL9535A to interface with next-generation microprocessors and

microcontrollers where supply levels are dropping down to conserve power.

The PCAL9535A contains the PCA9535 register set of four pairs of 8-bit Configuration,

Input, Output, and Polarity Inversion registers, and additionally, the PCAL9539 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 PCAL9535A is a pin-to-pin replacement to the PCA9535 and PCA9535A, however,

the PCAL9535A powers up with all I/O interrupts masked. This mask default allows for a

board bring-up free of spurious interrupts at power-up.

The PCAL9535A 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 PCAL9535A 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.

PCAL9535A

Low-voltage 16-bit I2C-bus I/O port with interrupt and Agile I/O

Rev. 1 — 28 September 2012

Product data sheet

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PCAL9535APW Datasheet(PDF) 1 Page - NXP Semiconductors

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