MCP23009ESS datasheet(3/50 Pages) MICROCHIP

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DS22121B-page 3

MCP23009/MCP23S09

1.0

DEVICE OVERVIEW

The MCP23X09 device provides 8-bit, general purpose

parallel I/O expansion for I2C bus or SPI applications.

The two devices differ only in the serial interface.

• MCP23009 - I2C interface

• MCP23S09 - SPI interface

The MCP23X09 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):

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.

When

input

state

differs

from

pre-configured

value

(DEFVAL

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 pin is used to determine the

device address.

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