MCP23017-E/SO

The MCP23017-E/SO is an I/O expander IC with 16 GPIO pins that can be controlled via an I2C interface. This IC is ideal for expanding the I/O capabilities of microcontrollers with limited GPIO pins, providing additional digital inputs and outputs for various applications.

Pinout

(Note: The pin configuration below is a general representation. Refer to the specific datasheet for precise details.)

• Pin 1: A0 (I2C Slave Address Bit 0)
• Pin 2: A1 (I2C Slave Address Bit 1)
• Pin 3: A2 (I2C Slave Address Bit 2)
• Pin 4: GND (Ground)
• Pin 5: INTA (Interrupt Output A)
• Pin 6: INTB (Interrupt Output B)
• Pin 7: RESET (Reset Pin)
• Pin 8: VDD (Power Supply Voltage)
• Pin 9: GPA0 (GPIO Pin 0)
• Pin 10: GPA1 (GPIO Pin 1)
• Pin 11: GPA2 (GPIO Pin 2)
• Pin 12: GPA3 (GPIO Pin 3)
• Pin 13: GPA4 (GPIO Pin 4)
• Pin 14: GPA5 (GPIO Pin 5)
• Pin 15: GPA6 (GPIO Pin 6)
• Pin 16: GPA7 (GPIO Pin 7)
• Pin 17: VSS (Ground)
• Pin 18: GPB0 (GPIO Pin 8)
• Pin 19: GPB1 (GPIO Pin 9)
• Pin 20: GPB2 (GPIO Pin 10)
• Pin 21: GPB3 (GPIO Pin 11)
• Pin 22: GPB4 (GPIO Pin 12)
• Pin 23: GPB5 (GPIO Pin 13)
• Pin 24: GPB6 (GPIO Pin 14)
• Pin 25: GPB7 (GPIO Pin 15)
• Pin 26: INT (Interrupt Output)
• Pin 27: SDA (I2C Serial Data)
• Pin 28: SCL (I2C Serial Clock)

Circuit Diagram

Incorporate a circuit diagram that illustrates the connections and operation of the MCP23017-E/SO IC for a more visual representation.

Key Features

• 16 GPIO Pins: The MCP23017-E/SO features 16 GPIO pins that can be configured as inputs or outputs, providing flexibility for various applications.
• I2C Interface: This IC communicates with the host microcontroller via the I2C interface, allowing for easy integration into existing systems.
• High-Speed I2C Interface: The MCP23017-E/SO supports high-speed I2C communication, making it suitable for applications requiring fast data transfer rates.
• Internal Pull-Up Resistors: Internal pull-up resistors are available on each GPIO pin, simplifying circuit design by eliminating the need for external resistors.
• Interrupt Output Pin: The MCP23017-E/SO includes an interrupt output pin that can be configured to alert the host microcontroller of GPIO pin changes, reducing the need for constant polling.

Note: For detailed technical specifications, please refer to the MCP23017-E/SO datasheet.

Application

• Keypad Interfacing: The MCP23017-E/SO can be used to interface with keypads, providing additional GPIO pins for scanning keypad matrix configurations.
• LED Matrix Control: This IC is suitable for controlling LED matrices, allowing for dynamic control of LED displays using minimal GPIO pins.
• Industrial Control Systems: The MCP23017-E/SO is ideal for use in industrial control systems, providing additional digital inputs and outputs for controlling various industrial devices.

Functionality

The MCP23017-E/SO expands the I/O capabilities of microcontrollers by providing 16 additional GPIO pins that can be controlled via an I2C interface. Its flexible configuration options and interrupt capabilities make it a versatile solution for various applications requiring additional digital I/O.

Usage Guide

• I2C Addressing: Set the I2C slave address by connecting the A0, A1, and A2 pins to VDD or GND to configure the device's address.
• GPIO Configuration: Configure each GPIO pin as an input or output by writing to the corresponding register bits using the I2C interface.
• Interrupt Configuration: Enable or disable interrupts on the INT pin by configuring the interrupt enable register using the I2C interface.

Frequently Asked Questions

Q: Can the MCP23017-E/SO be used with 3.3V microcontrollers?
A: Yes, the MCP23017-E/SO supports both 3.3V and 5V operation, making it compatible with a wide range of microcontrollers.

Q: What is the maximum I2C clock frequency supported by the MCP23017-E/SO?
A: The MCP23017-E/SO supports I2C clock frequencies up to 400kHz, allowing for fast data transfer rates between the IC and the host microcontroller.