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MCP23008T-E/SO

Name: MCP23008T-E/SO
Rating: 4.7 (12 reviews)

IC XPNDR 1.7MHZ I2C 18SOIC

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資料表 MCP23008T-E/SO DataSheet
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規格

Part Status	Active
DigiKey Programmable	Not Verified
Number of I/O	8
Interface	I2C
Interrupt Output	Yes
Features	POR
Output Type	Push-Pull
Current - Output Source/Sink	25mA
Clock Frequency	1.7 MHz
Voltage - Supply	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	18-SOIC (0.295", 7.50mm Width)
Supplier Device Package	18-SOIC
Base Product Number	MCP23008

概述

Description

Introduction to MCP23008T-E/SO:
- What it is: An 8-bit I/O expander with I2C interface from Microchip, adding eight GPIO lines to a microcontroller.
- Package: 18-pin SOIC version (the MCP23008T-E/SO designation indicates a SO package variant).
- Key features: 8 bidirectional I/O pins; registers to configure direction (IODIR), input polarity (IPOL), pull-ups (GPPU), and interrupt behavior (GPINTEN, DEFVAL, INTCON); IOCON for advanced features; GPIO and OLAT registers for reading/writing outputs; interrupt output (INT) for port-change events.
- I2C addressing: 7-bit address 0100 A2 A1 A0, with A0–A2 pins selecting up to 8 devices on the bus (addresses 0x20–0x27).
- How it works: Write IODIR to set pins as input/output; enable pull-ups with GPPU; read GPIO or write OLAT to set outputs; use INTF/INTCAP to handle interrupts; configure INTCON/DEFVAL for specific interrupt behavior.
- Applications: Expand MCU I/O for keyboards, LED drivers, sensors, or simple digital peripherals where I2C is available.

Features

Key features of MCP23008T-E/SO (8-bit I/O expander with I2C):
- 8 bidirectional I/O pins; each pin configurable as input or output (IODIR)
- I2C-compatible interface; up to 400 kHz I2C Fast mode
- Address selection via A0–A2; base address 0x20 (7-bit), up to 8 devices on bus
- VDD range: 1.8 to 5.5 V; I/O pins operate at VDD
- Per-pin internal pull-ups (GPPU) for inputs
- Input polarity inversion (IPOL)
- Interrupt-on-change with INT output; configurable via INTCON/DEFVAL/INTCAP/INTF
- Rich register set: GPIO, OLAT, INTF, INTCAP, GPPU, IODIR, IPOL, DEFVAL, INTCON, IOCON
- IOCON control register for configuration
- Low power consumption
- Package: 8-pin SOIC; RoHS-compliant (E/SO) with extended temperature grade (-40°C to +125°C)
- Packaging code includes T (temperature grade) and E/SO (RoHS SOIC)
Ideal for simple I/O expansion on I2C-heavy microcontroller systems.

Package

Package type: SOIC (Small Outline Integrated Circuit), 16-pin.

Pinout

Pin count: 16 pins (SOIC-16).
Function: I2C 8‑bit I/O expander (MCP23008) with eight GPIOs that can be configured as input/output, supports pull-ups, interrupt on change, and 2‑byte register access (IODIR, GPINTEN, GPPU, GPIO, OLAT, etc.).

Manufacturer

Manufacturer: Microchip Technology Inc.
What kind of company: A global semiconductor company that designs and manufactures microcontrollers, memory, and analog ICs for embedded systems and electronics.

Application

Mainly an I2C 8-bit GPIO expander to extend MCU pins. Applications:
- 8-bit I/O expansion for embedded systems
- Keyboard/keypad scanning with interrupt notification
- LED driving and status indicators
- Interface sensors, switches, and other low-current peripherals
- Distributed I/O for industrial and home automation; scalable multi-device I2C configurations

Equivalent

Equivalent 8-bit I/O expander devices (I2C) to MCP23008T-E/SO include:
- NXP PCF8574 / PCF8574A
- NXP PCA9554 / PCA9554A
- TI TCA9534 / TCA9534A
Other options (different interface or more pins):
- Microchip MCP23S08 (SPI)
- Microchip MCP23016 / MCP23017 (16-bit I2C)