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MCP23008T-E/ML
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MCP23008T-E/ML

Product Overview

  • Category: Integrated Circuit
  • Use: GPIO Expander
  • Characteristics: 8-bit I/O expander with I2C interface
  • Package: QFN-20
  • Essence: Expand the number of available I/O pins on a microcontroller
  • Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

  • Supply Voltage: 1.8V to 5.5V
  • Number of I/O Pins: 8
  • I2C Bus Frequency: Up to 400 kHz
  • Operating Temperature Range: -40°C to +85°C
  • Input/Output Type: Bidirectional
  • Interrupt Output Pin: Yes
  • Maximum Sink/Source Current per I/O Pin: 25 mA

Detailed Pin Configuration

The MCP23008T-E/ML has a total of 20 pins in a QFN package. The pin configuration is as follows:

  1. VDD - Power supply voltage
  2. VSS - Ground
  3. SDA - I2C serial data input/output
  4. SCL - I2C serial clock input
  5. INT - Interrupt output
  6. A2 - Address selection bit 2
  7. A1 - Address selection bit 1
  8. A0 - Address selection bit 0
  9. GP0 - General-purpose I/O pin 0
  10. GP1 - General-purpose I/O pin 1
  11. GP2 - General-purpose I/O pin 2
  12. GP3 - General-purpose I/O pin 3
  13. GP4 - General-purpose I/O pin 4
  14. GP5 - General-purpose I/O pin 5
  15. GP6 - General-purpose I/O pin 6
  16. GP7 - General-purpose I/O pin 7
  17. RESET - Reset input
  18. NC - No connection
  19. NC - No connection
  20. VDD - Power supply voltage

Functional Features

  • Expand the number of available I/O pins on a microcontroller using the I2C interface.
  • Bidirectional I/O pins allow both input and output functionality.
  • Interrupt output pin for efficient event-driven programming.
  • Wide operating voltage range allows compatibility with various systems.
  • Low power consumption for energy-efficient applications.

Advantages and Disadvantages

Advantages: - Provides additional I/O pins, increasing the flexibility of microcontroller-based designs. - Simple I2C interface for easy integration into existing systems. - Interrupt capability enhances responsiveness in time-critical applications. - Wide operating voltage range enables compatibility with different power sources.

Disadvantages: - Limited to 8 I/O pins, may not be sufficient for complex projects requiring more I/Os. - Requires I2C communication protocol support from the microcontroller. - Not suitable for applications requiring high-speed data transfer.

Working Principles

The MCP23008T-E/ML is an I/O expander that communicates with a microcontroller through the I2C bus. It provides an additional 8 I/O pins, which can be configured as inputs or outputs. The microcontroller sends commands over the I2C bus to set the direction (input or output) and read or write data on the individual pins. The interrupt output pin can be used to notify the microcontroller of specific events, reducing the need for continuous polling.

Detailed Application Field Plans

The MCP23008T-E/ML is widely used in various applications, including but not limited to:

  1. Home automation systems: Expanding the number of available I/O pins for controlling lights, appliances, and sensors.
  2. Industrial automation: Adding extra I/Os for monitoring and controlling machinery and equipment.
  3. Robotics: Increasing the number of I/O pins for controlling motors, sensors, and actuators.
  4. IoT devices: Enabling more I/Os for connecting sensors, actuators, and communication modules.
  5. Automotive electronics: Providing additional I/Os for various vehicle control systems.

Detailed and Complete Alternative Models

  1. MCP23017 - 16-bit I/O expander with I2C interface
  2. PCF8574 - 8-bit I/O expander with I2C interface
  3. MAX7313 - 16-bit I/O expander with SPI interface
  4. SN74HC595 - 8-bit shift register with serial input and parallel output
  5. CD4021B - 8-bit static shift register with parallel input and serial output

These alternative models offer similar functionality to the MCP23008T-E/ML and can be considered based on specific project requirements.

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Listen Sie 10 häufige Fragen und Antworten im Zusammenhang mit der Anwendung von MCP23008T-E/ML in technischen Lösungen auf

  1. What is the maximum voltage rating for MCP23008T-E/ML?
    - The maximum voltage rating for MCP23008T-E/ML is 5.5V.

  2. How many I/O pins does MCP23008T-E/ML have?
    - MCP23008T-E/ML has 8 I/O pins.

  3. Can MCP23008T-E/ML be used with both 3.3V and 5V microcontrollers?
    - Yes, MCP23008T-E/ML is compatible with both 3.3V and 5V microcontrollers.

  4. What is the maximum frequency supported by MCP23008T-E/ML?
    - The maximum frequency supported by MCP23008T-E/ML is 100kHz.

  5. Is MCP23008T-E/ML suitable for use in automotive applications?
    - Yes, MCP23008T-E/ML is suitable for use in automotive applications.

  6. Can MCP23008T-E/ML be used for interrupt generation?
    - Yes, MCP23008T-E/ML supports interrupt generation on its I/O pins.

  7. What is the operating temperature range for MCP23008T-E/ML?
    - The operating temperature range for MCP23008T-E/ML is -40°C to 125°C.

  8. Does MCP23008T-E/ML have built-in pull-up resistors?
    - Yes, MCP23008T-E/ML has configurable pull-up resistors on its I/O pins.

  9. Can multiple MCP23008T-E/ML devices be cascaded together?
    - Yes, multiple MCP23008T-E/ML devices can be cascaded together to expand the number of I/O pins.

  10. Is there a development kit available for MCP23008T-E/ML?
    - Yes, there is a development kit available for MCP23008T-E/ML, which includes sample code and documentation for easy integration into technical solutions.