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MCP23008

8-Bit I/O Expander with Serial Interface

Microchip Technology

MCP23008 Datasheet PDF : 44 Pages

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MCP23008/MCP23S08

1.0 DEVICE OVERVIEW

The MCP23X08 device provides 8-bit, general

purpose, parallel I/O expansion for I2C bus or SPI

applications. The two devices differ in the number of

hardware address pins and the serial interface:

• MCP23008 – I2C interface; three address pins

• MCP23S08 – SPI interface; two address pins

The MCP23X08 consists of multiple 8-bit configuration

registers for input, output and polarity selection. The

system master can enable the I/Os as either inputs or

outputs by writing 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

The interrupt output can be configured to activate

under two conditions (mutually exclusive):

1. When any input state differs from its

corresponding input port register state, this is

used to indicate to the system master that an

input state has changed.

2. When an input state differs from a preconfigured

The Interrupt Capture register captures port values at

the time of the interrupt, thereby saving the condition

that caused the interrupt.

The Power-on Reset (POR) sets the registers to their

default values and initializes the device state machine.

The hardware address pins are used to determine the

device address.

1.1 Pin Descriptions

TABLE 1-1: PINOUT DESCRIPTION

Name

PDIP/

SOIC

QFN

SSOP

Type

Function

SCL/SCK 1

SDA/SI

A2/SO

RESET

NC/CS

INT

VSS

GP0

GP1

GP2

GP3

GP4

GP5

GP6

GP7

VDD

N/C

—

I Serial clock input.

I/O Serial data I/O (MCP23008)/Serial data input (MCP23S08).

I/O Hardware address input (MCP23008)/

Serial data output (MCP23S08).

A2 must be biased externally.

I Hardware address input. Must be biased externally.

I External reset input. Must be biased externally.

I No connect (MCP23008)/External chip select input (MCP23S08).

O Interrupt output. Can be configured for active-high, active-low or

open-drain.

P Ground.