PCA6408APW,118

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: General Purpose Input/Output (GPIO) Expander
• Characteristics:
  • 8-bit I/O expander with I2C interface
  • Low power consumption
  • Wide operating voltage range
  • Small package size
• Package: TSSOP (Thin Shrink Small Outline Package)
• Essence: Expansion of the number of available GPIO pins
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 1.65V to 5.5V
• I/O Voltage Range: 1.8V to 5.5V
• Maximum Output Current: ±10mA
• Operating Temperature Range: -40°C to +85°C
• I2C Bus Frequency: Up to 400kHz

Detailed Pin Configuration

The PCA6408APW,118 has a total of 20 pins. The pin configuration is as follows:

| Pin Number | Pin Name | Description | |------------|----------|-------------| | 1 | VDD | Power supply voltage | | 2 | SDA | I2C serial data input/output | | 3 | SCL | I2C serial clock input | | 4-11 | P0-P7 | General-purpose I/O pins | | 12 | INT | Interrupt output | | 13-16 | A0-A3 | Address selection pins | | 17 | GND | Ground | | 18-20 | NC | No connection |

Functional Features

• Expandability: The PCA6408APW,118 provides 8 additional GPIO pins, allowing for increased flexibility in system design.
• I2C Interface: The device communicates with the host microcontroller through the I2C bus, enabling easy integration into existing systems.
• Interrupt Output: The INT pin can be configured to generate an interrupt signal based on user-defined conditions, enhancing system responsiveness.

Advantages and Disadvantages

Advantages: - Small package size allows for space-efficient PCB layout. - Wide operating voltage range enables compatibility with various power supply configurations. - Low power consumption helps conserve energy in battery-powered applications.

Disadvantages: - Limited number of GPIO pins compared to some other expanders on the market. - Lack of built-in protection features may require additional circuitry for certain applications.

Working Principles

The PCA6408APW,118 is controlled via the I2C interface. The host microcontroller sends commands and data to the expander, which then performs the requested operations on its GPIO pins. The device can be configured as inputs or outputs individually, allowing for versatile usage scenarios. The interrupt output pin can be used to notify the microcontroller of specific events or changes on the GPIO pins.

Detailed Application Field Plans

The PCA6408APW,118 finds applications in various fields, including but not limited to: 1. Consumer Electronics: Used for expanding the number of available GPIO pins in devices such as smart home controllers, remote controls, and gaming consoles. 2. Industrial Automation: Enables increased I/O capabilities in industrial control systems, PLCs (Programmable Logic Controllers), and robotics. 3. Automotive: Used for GPIO expansion in automotive electronics, such as infotainment systems, dashboard controls, and lighting modules. 4. Internet of Things (IoT): Facilitates connectivity and control in IoT devices, including sensors, actuators, and smart appliances.

Detailed and Complete Alternative Models

1. MCP23017: Similar 16-bit I/O expander with I2C interface, offering more GPIO pins.
2. PCF8574: 8-bit I/O expander with I2C interface, suitable for simpler applications with lower pin count requirements.
3. MAX7313: 16-bit I/O expander with serial interface, providing additional features like LED driver functionality.

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