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AN1043

更新时间： 2024-10-29 06:37:11

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美国微芯 - MICROCHIP		/
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Unique Features of the MCP23X08/17 GPIO Expanders

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AN1043 数据手册

AN1043

Unique Features of the MCP23X08/17 GPIO Expanders

I/O PORT DESCRIPTION

Author:

Pat Richards

Microchip Technology Inc.

The I/O port is highly configurable for maximum

flexibility. Figure 1 is a simplified block diagram of an

I/O port pin. The port can either drive logic levels on the

pin, or read logic levels from the pad. The level on the

pad can be read at any time, regardless if the pin is

configured as an input or an output.

INTRODUCTION

GPIO expanders provide easy I/O expansion using

standard serial interfaces. GPIO products are used to

increase the I/O on an MCU or provide remote I/O

using a serial interface.

The IODIR register controls the direction of the pins

(input or output). More specifically, the IODIR registers

simply enables/disables the output driver. When the

driver is activated (IODIR = 0), the pad is driven to the

state in the latch register (OLAT). When deactivated

(IODIR = 1), the driver is high impedance.

This application note discusses the feature set and use

of the MCP23X08/17 (8-bit and 16-bit) GPIO Expand-

ers.

The MCP23X08 are 8-bit GPIO Expanders:

• MCP23008: I²C™ Interface

The I/O port has multiple, individual configurations.

^{Each pin can}…

• MCP23S08: SPI Interface

• …be configured as an input. The output driver is

The MCP23X17 are 16-bit GPIO Expanders:

• MCP23017: I²C Interface

disabled (high impedance)

^•…be configured as an output. The output driver

is enabled and the value in the latch is driven on

the pin.

• MCP23S17: SPI Interface

The functions and features of the MCP23X08 and

MCP23X17 are basically the same, except where

otherwise noted.

^•…enable a weak pull-up resistor

^•…emulate an open-drain configuration. This is

accomplished by clearing the output latch (OLAT)

bit to a zero and using the direction register

(IODIR) to set the level on the pin. A pull-up

resistor is required to pull the pin to voltage when

the pin is an input

FEATURES

This application note discusses some of the features of

the MCP23X08/17 and how they may be used in an

application:

- To drive a 0: configure the pin as an output

(IODIR = 0) so the port drives whatever is in

OLAT (logic 0 in this case)

• I/O Port Description

• 8/16-Bit Mode (MCP23X17 only)

• Interrupt Features

- To float a 1: set the pin as an input

(IODIR = 1). The output driver is disabled

and the pull-up resistor pulls the pin to a

logic 1

- Mapping Interrupts

- Mirroring Interrupts (MCP23X17 only)

- Servicing Interrupts

• Internal Address Pointer Control

• Hardware Address Pin on SPI

DS01043A-page 1

12 3 4 5 6 7...10

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