MCP23018-E/SO

Product Overview

Category

The MCP23018-E/SO 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 microprocessors. It provides additional digital I/O pins, allowing the user to connect more devices or sensors to a single microcontroller.

Characteristics

• 16-bit remote bidirectional I/O port
• High-speed I2C interface (up to 1.7 MHz)
• Three hardware address pins for up to eight devices on the bus
• Interrupt output pin for efficient event notification
• Low standby current consumption (less than 1 µA)

Package

The MCP23018-E/SO is available in a small outline (SO) package, which is a surface-mount package designed for easy integration onto printed circuit boards (PCBs).

Essence

The essence of the MCP23018-E/SO lies in its ability to provide additional I/O pins to microcontrollers, enhancing their connectivity and versatility.

Packaging/Quantity

This product is typically sold in reels or tubes containing multiple units. The exact quantity may vary depending on the supplier or manufacturer.

Specifications

• Supply Voltage: 1.8V to 5.5V
• Maximum I/O Pins: 16
• I2C Bus Frequency: Up to 1.7 MHz
• Operating Temperature Range: -40°C to +85°C
• Package Type: SOIC (Small Outline Integrated Circuit)

Detailed Pin Configuration

The MCP23018-E/SO has a total of 28 pins, each serving a specific purpose. Here is a detailed pin configuration:

1. GPA0 - General Purpose I/O Pin A0
2. GPA1 - General Purpose I/O Pin A1
3. GPA2 - General Purpose I/O Pin A2
4. GPA3 - General Purpose I/O Pin A3
5. GPA4 - General Purpose I/O Pin A4
6. GPA5 - General Purpose I/O Pin A5
7. GPA6 - General Purpose I/O Pin A6
8. GPA7 - General Purpose I/O Pin A7
9. VSS - Ground
10. VDD - Supply Voltage
11. INTA - Interrupt Output A
12. INTB - Interrupt Output B
13. RESET - Reset Input
14. SDA - I2C Serial Data
15. SCL - I2C Serial Clock
16. GPB0 - General Purpose I/O Pin B0
17. GPB1 - General Purpose I/O Pin B1
18. GPB2 - General Purpose I/O Pin B2
19. GPB3 - General Purpose I/O Pin B3
20. GPB4 - General Purpose I/O Pin B4
21. GPB5 - General Purpose I/O Pin B5
22. GPB6 - General Purpose I/O Pin B6
23. GPB7 - General Purpose I/O Pin B7
24. NC - No Connection
25. NC - No Connection
26. NC - No Connection
27. NC - No Connection
28. NC - No Connection

Functional Features

• Bidirectional I/O: Each pin can be configured as an input or output, allowing for versatile usage.
• Interrupt Capability: The MCP23018-E/SO supports interrupt functionality, enabling efficient event notification to the microcontroller.
• Addressing Flexibility: With three hardware address pins, up to eight devices can be connected on the same I2C bus.
• Low Power Consumption: The device has a low standby current consumption, making it suitable for power-sensitive applications.

Advantages and Disadvantages

Advantages

• Provides additional I/O pins, expanding the connectivity of microcontrollers.
• Supports interrupt functionality for efficient event handling.
• Flexible addressing allows for multiple devices on the same bus.
• Low power consumption makes it suitable for battery-powered applications.

Disadvantages

• Limited to digital I/O and does not support analog inputs or outputs.
• Requires an I2C interface, which may add complexity to the system design.
• Not suitable for applications requiring a large number of I/O pins.

Working Principles

The MCP23018-E/SO communicates with the microcontroller through the I2C bus. It acts as an intermediary between the microcontroller and external devices, providing additional I/O pins. The microcontroller sends commands to the MCP23018-E/SO to configure the pins as inputs or outputs, read input values, or set output values. Interrupts can be used to notify the microcontroller of specific events, reducing the need for continuous polling.

Detailed Application Field Plans

The MCP23018-E/SO finds applications in various fields where additional I/O