MCP23008-E/P

Product Overview

Category

The MCP23008-E/P belongs to the category of integrated circuits (ICs) and specifically falls under the family of I/O expanders.

Use

This product is primarily used for expanding the input/output (I/O) capabilities of microcontrollers or other digital devices. It provides additional general-purpose input/output pins, allowing users to connect more peripheral devices or sensors to their system.

Characteristics

• 8-bit I/O expander
• Supports both input and output operations
• Can be controlled through an I2C interface
• Low power consumption
• Wide operating voltage range: 1.8V to 5.5V
• High-speed I2C communication (up to 400 kHz)
• Internal pull-up resistors for inputs
• Interrupt output pin for efficient event notification

Package

The MCP23008-E/P is available in a DIP (Dual Inline Package) format. The package type is PDIP (Plastic Dual In-line Package), which allows for easy mounting on a printed circuit board (PCB).

Essence

The essence of the MCP23008-E/P lies in its ability to provide additional I/O pins to systems with limited I/O capabilities. By using this IC, designers can overcome the limitations of microcontrollers or other digital devices that have a limited number of built-in I/O pins.

Packaging/Quantity

The MCP23008-E/P is typically sold in reels or tubes. Each reel contains 250 units of the IC, while each tube contains 25 units.

Specifications

• Number of I/O pins: 8
• Operating voltage: 1.8V to 5.5V
• Maximum I2C bus frequency: 400 kHz
• Maximum source/sink current per I/O pin: 25 mA
• Operating temperature range: -40°C to +85°C

Detailed Pin Configuration

The MCP23008-E/P has a total of 16 pins, which are assigned specific functions as follows:

1. GPA0: General Purpose I/O A0
2. GPA1: General Purpose I/O A1
3. GPA2: General Purpose I/O A2
4. GPA3: General Purpose I/O A3
5. GPA4: General Purpose I/O A4
6. GPA5: General Purpose I/O A5
7. GPA6: General Purpose I/O A6
8. GPA7: General Purpose I/O A7
9. VSS: Ground (0V)
10. VDD: Power Supply Voltage
11. SDA: Serial Data Line (I2C)
12. SCL: Serial Clock Line (I2C)
13. INT: Interrupt Output
14. NC: No Connection
15. NC: No Connection
16. NC: No Connection

Functional Features

• Bidirectional I/O pins: Each pin can be individually configured as an input or output.
• Internal pull-up resistors: The MCP23008-E/P provides internal pull-up resistors for the input pins, eliminating the need for external components in many applications.
• Interrupt capability: The IC features an interrupt output pin that can be used to efficiently notify the microcontroller of events or changes on the I/O pins.
• I2C interface: The MCP23008-E/P communicates with the microcontroller through the I2C bus, allowing for easy integration into existing systems.

Advantages and Disadvantages

Advantages

• Provides additional I/O pins, expanding the capabilities of microcontrollers or digital devices.
• Low power consumption makes it suitable for battery-powered applications.
• Wide operating voltage range allows for compatibility with various systems.
• Internal pull-up resistors simplify circuit design.
• Interrupt capability enhances system responsiveness.

Disadvantages

• Limited to 8 I/O pins, which may not be sufficient for some complex applications.
• Requires I2C communication protocol support from the microcontroller or host device.

Working Principles

The MCP23008-E/P operates by communicating with the microcontroller or host device through the I2C bus. The microcontroller sends commands and data to the IC, configuring the I/O pins as inputs or outputs. The IC can then read input states or drive output signals accordingly. The interrupt output pin can be used to notify the microcontroller of specific events or changes on the I/O pins, reducing the need for continuous polling.

Detailed Application Field Plans

The MCP23008-E/P finds applications in various fields, including but not limited to:

1. Home automation: Expanding the I/O capabilities of microcontrollers used in smart home systems, allowing control of multiple devices and sensors.
2. Industrial automation: Enabling the connection of additional sensors, actuators, and peripheral devices to programmable logic controllers (PLCs) or industrial control systems.
3. Robotics: Providing extra