MCP23X08/17 datasheet, PDF - EEWORLD Datasheet

Datasheet> All Categories > MCP23X08/17

Preview

MCP23X08/17: DescriptionUnique Features of the MCP23X08/17 GPIO Expanders; File Size255KB，10 Pages; ManufacturerMicrochip; Websitehttps://www.microchip.com

Download Datasheet Compare View All

MCP23X08/17 Overview

Unique Features of the MCP23X08/17 GPIO Expanders

Preview

Download Datasheet

View All

AN1043

Unique Features of the MCP23X08/17 GPIO Expanders

Author:

Pat Richards

Microchip Technology Inc.

I/O PORT DESCRIPTION

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.

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.

The I/O port has multiple, individual configurations.

Each pin can

…

•

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.

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: I

C™ Interface

• MCP23S08: SPI Interface

The MCP23X17 are 16-bit GPIO Expanders:

• MCP23017: I

C Interface

• MCP23S17: SPI Interface

The functions and features of the MCP23X08 and

MCP23X17 are basically the same, except where

otherwise noted.

…

be configured as an input. The output driver is

FEATURES

This application note discusses some of the features of

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

application:

• I/O Port Description

• 8/16-Bit Mode (MCP23X17 only)

• Interrupt Features

- Mapping Interrupts

- Mirroring Interrupts (MCP23X17 only)

- Servicing Interrupts

• Internal Address Pointer Control

• Hardware Address Pin on SPI

disabled (high impedance)

•

…

be configured as an output. The output driver

is enabled and the value in the latch is driven on

the pin.

•

…

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

- 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)

- 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

2006 Microchip Technology Inc.

DS01043A-page 1

MCP23X08/17 Related Products

	MCP23X08/17	AN1043
Description	Unique Features of the MCP23X08/17 GPIO Expanders	Unique Features of the MCP23X08/17 GPIO Expanders

Recommended Resources

Color signal amplification circuit diagram

TDA1170N power amplifier circuit

555 refrigerator power saving protector circuit

Astable circuit that directly drives the relay

Monostable circuit with long settling time

6OXT(1.0) computer motherboard circuit diagram_07

ADI's latest Chinese technical information: [align=left][font=宋体]Whichever one you need, take it yourself[/font]~ezchina.analog.com/thread/17635[/align][align=left] [/align][align=left][font=宋体]E-BOOK[/align][align=left][list] [*]ADI[font=宋体]Re...; 鲁宾汗 Analog electronics

Problems with LPC2214: I am using lpc2214. I read the Chinese document published by Zhou Ligong. It says that when P1, P2, and P3 are used as input , the level can be pulled up by the built-in pull-up resistor . I think thi...; smallwind1 ARM Technology

How to solve the problem of program not being able to download normally when debugging MSP430 chip under IAR: As the title says, I recently encountered a problem that the connection and burning of the MSP430 chip failed after installing IAR, as shown in the figure below. Later, I tried many methods and found ...; hansonhe Microcontroller MCU

NXP launches crossover processor i.MX RT1170, with a main frequency of up to 1G. What do you think? Is it fun? Is it easy to use?: Recently, NXP launched a new processor, i.MX RT1170, which is said to have a main frequency of up to 1G! What does that mean?The main frequency of general MCUs, such as the familiar ST MCUs, is genera...; okhxyyo Special Edition for Assessment Centres

Using TMS320C54x C Compiler: [size=4]TMS320C54x applications are generally more complex, so it would be very difficult and inefficient to program completely in assembly language. However, C language has become a trend in microcon...; 灞波儿奔 DSP and ARM Processors

EEWORLD Download Center May Recommended Books---Illustrated Electronic Innovation Production Book Album: [i=s]This post was last edited by tiankai001 on 2014-5-14 11:12[/i] [align=center][color=#000][size=5] Illustrated Electronic Innovation Production Book Album[/size][/color][/align] [size=5][color=#00...; tiankai001 Download Centre

Shortcut: L0 L1 L2 L3 L4 L5 L6 L7 L8 L9 LA LB LC LD LE LF LG LH LI LJ LK LL LM LN LO LP LQ LR LS LT LU LV LW LX LY LZ M0 M1 M2 M3 M4 M5 M6 M7 M8 M9 MA MB MC MD ME MF MG MH MI MJ MK ML MM MN MO MP MQ MR MS MT MU MV MW MX MY MZ N0 N1 N2 N3 N4 N5 N6 N7 N8 NA NB NC ND NE NF NG NH NI NJ NK NL NM NN NO NP NQ NR NS NT NU NV NX NZ O0 O1 O2 O3 OA OB OC OD OE OF OG OH OI OJ OK OL OM ON OP OQ OR OS OT OV OX OY OZ P0 P1 P2 P3 P4 P5 P6 P7 P8 P9 PA PB PC PD PE PF PG PH PI PJ PK PL PM PN PO PP PQ PR PS PT PU PV PW PX PY PZ Q1 Q2 Q3 Q4 Q5 Q6 Q8 Q9 QA QB QC QE QF QG QH QK QL QM QP QR QS QT QV QW QX QY R0 R1 R2 R3 R4 R5 R6 R7 R8 R9 RA RB RC RD RE RF RG RH RI RJ RK RL RM RN RO RP RQ RR RS RT RU RV RW RX RY RZ

Popular Components