PCA6408APW datasheet(1/40 Pages) NXP

Part #	PCA6408APW

Description	Low-voltage, 8-bit I2C-bus and SMBus I/O expander with interrupt output, reset, and configuration registers

PDF	40 Pages

Scroll/Zoom	100%

Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

Logo

1 / 40 page

1.

General description

The PCA6408A is an 8-bit general purpose I/O expander that provides remote I/O

expansion for most microcontroller families via the I2C-bus interface.

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

keeping interconnections to a minimum, for example, in battery-powered mobile

applications for interfacing to sensors, push buttons, keypad, etc. In addition to providing

a flexible set of GPIOs, it simplifies interconnection of a processor running at one voltage

level to I/O devices operating at a different (usually higher) voltage level. The PCA6408A

has built-in level shifting feature that makes these devices extremely flexible in mixed

signal environments where communication between incompatible I/O voltages is required.

Its wide VDD range of 1.65 V to 5.5 V on the dual power rail allows seamless

communications with next-generation low voltage microprocessors and microcontrollers

on the interface side (SDA/SCL) and peripherals at a higher voltage on the port side.

There are two supply voltages for PCA6408A: VDD(I2C-bus) and VDD(P). VDD(I2C-bus)

provides the supply voltage for the interface at the master side (for example, a

microcontroller) and the VDD(P) provides the supply for core circuits and Port P. The

bidirectional voltage level translation in the PCA6408A is provided through VDD(I2C-bus).

VDD(I2C-bus) should be connected to the VDD of the external SCL/SDA lines. This indicates

the VDD level of the I2C-bus to the PCA6408A. The voltage level on Port P of the

PCA6408A is determined by the VDD(P).

The PCA6408A consists of one 8-bit Configuration (input or output selection), Input,

Output, and Polarity Inversion (active HIGH) register. At power-on, the I/Os are configured

as inputs. However, the system master can enable the I/Os as either inputs or outputs by

writing to the I/O configuration bits. The data for each input or output is kept in the

corresponding Input or Output register. The polarity of the Input port register can be

inverted with the Polarity Inversion register, saving interrupts.

The system master can reset the PCA6408A in the event of a time-out or other improper

operation by asserting a LOW in the RESET input. The power-on reset puts the registers

in their default state and initializes the I2C-bus/SMBus state machine. The RESET pin

causes the same reset/initialization to occur without de-powering the part.

The PCA6408A 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 PCA6408A can

remain a simple slave device.

PCA6408A

Low-voltage, 8-bit I2C-bus and SMBus I/O expander with

interrupt output, reset, and configuration registers

Rev. 1 — 27 September 2012

Product data sheet

Similar Part No. - PCA6408APW

Manufacturer	Part #	Datasheet	Description
NXP Semiconductors	PCA6416A	727Kb / 8P	Smart, simple solutions for the 12 most common design concerns August 2011
	PCA6416A	2Mb / 42P	Low-voltage translating 16-bit I2C-bus/SMBus I/O expander Rev. 1-11 September 2012
	PCA6416AEV	2Mb / 42P	Low-voltage translating 16-bit I2C-bus/SMBus I/O expander Rev. 1-11 September 2012
	PCA6416AHF	2Mb / 42P	Low-voltage translating 16-bit I2C-bus/SMBus I/O expander Rev. 1-11 September 2012
	PCA6416APW	2Mb / 42P	Low-voltage translating 16-bit I2C-bus/SMBus I/O expander Rev. 1-11 September 2012

More results

Similar Description - PCA6408APW

Manufacturer	Part #	Datasheet	Description
Texas Instruments	TCA6408	841Kb / 30P	LOW-VOLTAGE 8-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
	TCA6416	781Kb / 31P	LOW-VOLTAGE 16-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
	TCA6416A	900Kb / 32P	LOW-VOLTAGE 16-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
	TCA6408	927Kb / 31P	LOW-VOLTAGE 8-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
	TCA6416	913Kb / 35P	LOW-VOLTAGE 16-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
	TCA6416A	909Kb / 34P	LOW-VOLTAGE 16-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
	TCA6408A	932Kb / 35P	LOW-VOLTAGE 8-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
	TCA9554	663Kb / 31P	LOW VOLTAGE 8-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT AND CONFIGURATION REGISTERS
NXP Semiconductors	PCAL6408A	2Mb / 48P	Low-voltage translating, 8-bit I2C-bus/SMBus I/O expander with interrupt output, reset, and configuration registers Rev. 2-6 December 2012
Texas Instruments	TCAL9538	1Mb / 41P	TCAL9538 8-Bit I2C-Bus, SMBus I/O Expander With Interrupt Output, Reset, and Agile I/O Configuration Registers REVISED NOVEMBER 2023

More results

PCA6408APW Datasheet(PDF) 1 Page - NXP Semiconductors

PCA6408APW Datasheet(HTML) 1 Page - NXP Semiconductors

Similar Part No. - PCA6408APW

Similar Description - PCA6408APW

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

Datasheet Download

Link URL