PCA6408AHKX

Product Overview

• Category: Integrated Circuit (IC)
• Use: General Purpose Input/Output (GPIO) Expander
• Characteristics: High-performance, low-power, 8-bit I/O expander with interrupt output
• Package: 16-pin TSSOP (Thin Shrink Small Outline Package)
• Essence: Expand the number of available GPIO pins on a microcontroller or other digital device
• Packaging/Quantity: Available in reels of 2500 units

Specifications

• Supply Voltage: 1.65V to 5.5V
• Number of I/O Pins: 8
• I/O Voltage Level: 1.8V to 5.5V
• Interrupt Output: Open-drain output with programmable polarity
• Operating Temperature Range: -40°C to +85°C
• Interface: I2C-compatible, supports standard (100 kHz) and fast (400 kHz) modes

Detailed Pin Configuration

The PCA6408AHKX has a total of 16 pins, which are assigned as follows:

1. A0: Address input bit 0
2. A1: Address input bit 1
3. A2: Address input bit 2
4. INT: Interrupt output
5. SDA: Serial Data Line (I2C)
6. SCL: Serial Clock Line (I2C)
7. P0: Programmable I/O pin 0
8. P1: Programmable I/O pin 1
9. P2: Programmable I/O pin 2
10. P3: Programmable I/O pin 3
11. P4: Programmable I/O pin 4
12. P5: Programmable I/O pin 5
13. P6: Programmable I/O pin 6
14. P7: Programmable I/O pin 7
15. VDD: Supply voltage
16. GND: Ground

Functional Features

• Provides additional GPIO pins for devices with limited I/O capabilities
• Supports both input and output modes for each pin
• Configurable interrupt output for efficient event-driven designs
• Low standby current consumption, suitable for battery-powered applications
• Compatible with standard I2C interface, allowing easy integration with microcontrollers and other digital devices

Advantages and Disadvantages

Advantages: - High-performance and low-power operation - Wide supply voltage range allows compatibility with various systems - Flexible I/O configuration options - Interrupt output enhances system responsiveness - Compact package size for space-constrained designs

Disadvantages: - Limited number of I/O pins (8) - Requires an external microcontroller or digital device to control and communicate with the expander

Working Principles

The PCA6408AHKX is an I2C-based GPIO expander that extends the number of available I/O pins on a microcontroller or other digital device. It communicates with the host device through the I2C bus, allowing the host to read or write the state of the individual I/O pins.

By configuring the appropriate registers within the PCA6408AHKX, the user can set each pin as either an input or an output. The expander also supports programmable pull-up resistors for input pins. Changes in the pin states can trigger an interrupt output, which can be used to notify the host device of specific events.

Detailed Application Field Plans

The PCA6408AHKX finds applications in various fields, including but not limited to:

1. Industrial automation: Expanding the number of I/O pins in control systems, PLCs (Programmable Logic Controllers), and industrial sensors.
2. Consumer electronics: Enabling additional user interface elements, such as buttons, switches, and LEDs, in devices like smart home controllers, remote controls, and gaming consoles.
3. Automotive systems: Providing extra I/O capabilities for vehicle control modules, infotainment systems, and dashboard displays.
4. Internet of Things (IoT): Facilitating the connection of multiple sensors, actuators, and peripheral devices to IoT platforms and edge computing devices.

Detailed and Complete Alternative Models

1. MCP23008: 8-bit I/O expander with similar features and I2C interface.
2. PCF8574: 8-bit I/O expander with I2C interface and higher voltage compatibility.
3. MAX7313: 16-bit I/O expander with interrupt output and I2C interface.
4. TCA9539: 16-bit I/O expander with configurable interrupt pins and I2C interface.

These alternative models offer similar functionality to the PCA6408AHKX and can be considered based on specific requirements and system constraints.

Word count: 587 words