MCP23017-ESLASHSP datasheet(3/48 Pages) MICROCHIP

3 / 48 page

DS21952B-page 3

MCP23017/MCP23S17

1.0

DEVICE OVERVIEW

The MCP23017/MCP23S17 (MCP23X17) device

family provides 16-bit, general purpose parallel I/O

expansion for I2C bus or SPI applications. The two

devices differ only in the serial interface.

• MCP23017 – I2C interface

• MCP23S17 – SPI interface

The MCP23X17 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 (IODIRA/B).

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. All registers can be read by the

system master.

The 16-bit I/O port functionally consists of two 8-bit

ports (PORTA and PORTB). The MCP23X17 can be

configured to operate in the 8-bit or 16-bit modes via

IOCON.BANK.

There are two interrupt pins, INTA and INTB, that can

be associated with their respective ports, or can be

logically OR’ed together so that 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 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.

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