MAX6818EAP

Product Overview

• Category: Integrated Circuit
• Use: Digital Input/Output Expander
• Characteristics: Low-voltage, I²C-Compatible, 8-Bit I/O Port with Interrupt and Reset
• Package: 20-pin SSOP (Shrink Small Outline Package)
• Essence: The MAX6818EAP is a versatile digital input/output expander that allows for easy expansion of the number of input/output ports in a microcontroller-based system.
• Packaging/Quantity: The MAX6818EAP is available in a 20-pin SSOP package. It is typically sold in reels of 2500 units.

Specifications

• Supply Voltage: 2.7V to 5.5V
• Number of I/O Ports: 8
• I/O Voltage Levels: 0V to VDD
• I²C Bus Compatibility: Standard-mode (100kHz) and Fast-mode (400kHz)
• Interrupt Output: Active-low open-drain output
• Reset Input: Active-low input for resetting the device
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The MAX6818EAP has a total of 20 pins. The pin configuration is as follows:

1. SDA - I²C Serial Data Input/Output
2. SCL - I²C Serial Clock Input
3. A0 - Address Input Bit 0
4. A1 - Address Input Bit 1
5. A2 - Address Input Bit 2
6. RESET - Active-Low Reset Input
7. INT - Active-Low Interrupt Output
8. GND - Ground
9. D0 - I/O Port 0
10. D1 - I/O Port 1
11. D2 - I/O Port 2
12. D3 - I/O Port 3
13. D4 - I/O Port 4
14. D5 - I/O Port 5
15. D6 - I/O Port 6
16. D7 - I/O Port 7
17. VDD - Supply Voltage
18. NC - No Connection
19. NC - No Connection
20. NC - No Connection

Functional Features

• Provides 8 additional digital input/output ports to a microcontroller system.
• Supports both standard-mode and fast-mode I²C communication.
• Interrupt output allows for efficient event-driven programming.
• Reset input allows for easy device reset when needed.
• Low-voltage operation makes it suitable for battery-powered applications.

Advantages and Disadvantages

Advantages: - Easy expansion of I/O ports in microcontroller systems. - Versatile and compatible with various microcontrollers. - Low-voltage operation extends battery life in portable devices. - Interrupt feature enables efficient event handling.

Disadvantages: - Limited number of I/O ports (8 in total). - Requires I²C bus communication, which may add complexity to the system design.

Working Principles

The MAX6818EAP operates as an I²C slave device, communicating with a microcontroller through the I²C bus. It expands the number of available digital input/output ports by providing an additional 8 ports. The device can be addressed using the A0, A1, and A2 pins, allowing multiple MAX6818EAP devices to coexist on the same I²C bus.

The I/O ports can be configured as either inputs or outputs through software control. The interrupt output pin (INT) can be used to signal the microcontroller when a specific event occurs on any of the I/O ports. The reset input pin (RESET) allows for easy device reset when needed.

Application Field Plans

The MAX6818EAP can be used in various applications that require additional digital input/output ports. Some potential application fields include:

1. Home Automation Systems: The MAX6818EAP can be used to expand the number of available I/O ports in home automation systems, allowing for control of various devices and sensors.
2. Industrial Control Systems: It can be utilized in industrial control systems to provide additional I/O ports for monitoring and controlling equipment.
3. Internet of Things (IoT) Devices: IoT devices often require multiple I/O ports for sensor inputs and actuator outputs. The MAX6818EAP can be integrated into IoT devices to expand their capabilities.
4. Robotics: Robots often require a large number of I/O ports for sensor integration and motor control. The MAX6818EAP can be used to increase the I/O capacity of robotic systems.

Alternative Models

• MAX7312: 16-Bit I/O Expander with Serial Interface
• MCP23017: 16-Bit I/O Expander with I²C Interface