MCP23017-ESLASHML datasheet(12/42 Pages) MICROCHIP

12 / 42 page

MCP23017/MCP23S17

DS20001952C-page 12

 2005-2016 Microchip Technology Inc.

3.0

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.

3.1

Power-on Reset (POR)

The on-chip POR circuit holds the device in reset until

VDD has reached a high enough voltage to deactivate

the POR circuit (i.e., release the device from reset).

The maximum VDD rise time is specified in Section 1.0

“Electrical Characteristics”.

When the device exits the POR condition (releases

reset), device operating parameters (i.e., voltage,

temperature, serial bus frequency, etc.) must be met to

ensure proper operation.

3.2

Serial Interface

This block handles the functionality of the I2C

(MCP23017) or SPI (MCP23S17) interface protocol.

The MCP23X17 contains 22 individual registers (11

Interface block, as shown in Table 3-1.

TABLE 3-1:

Address

IOCON.BANK = 1

Address

IOCON.BANK = 0

Access to:

00h

IODIRA

10h

01h

IODIRB

01h

02h

IPOLA

11h

03h

IPOLB

02h

04h

GPINTENA

12h

05h

GPINTENB

03h

06h

DEFVALA

13h

07h

DEFVALB

04h

08h

INTCONA

14h

09h

INTCONB

05h

0Ah

IOCON

15h

0Bh

IOCON

06h

0Ch

GPPUA

16h

0Dh

GPPUB

07h

0Eh

INTFA

17h

0Fh

INTFB

08h

10h

INTCAPA

18h

11h

INTCAPB

09h

12h

GPIOA

19h

13h

GPIOB

0Ah

14h

OLATA

1Ah

15h

OLATB

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