MCP23018 datasheet(4/56 Pages) MICROCHIP

4 / 56 page

MCP23018/MCP23S18

DS22103A-page 4

1.0

DEVICE OVERVIEW

The MCP23X18 device provides 16-bit, general pur-

pose parallel I/O expansion for I2C bus or SPI

applications. The two devices differ only in the serial

interface.

• MCP23018 - I2C interface

• MCP23S18 - SPI interface

The MCP23X18 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 16-bit I/O port functionally consists of two (2) 8-bit

ports (PORTA and PORTB). The MCP23X18 can be

configured to operate in 8-bit mode or 16-bit mode via

IOCON.BANK.

There are two interrupt pins, INTA and INTB which can

be associated with their respective ports, or can be

logically OR’ed together so both pins will activate if

either port causes an interrupt.

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 an input state differs from a pre-

configured register value (DEFVAL register).

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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