PCAL6408AEX1Z

Product Overview

• Category: Integrated Circuit
• Use: GPIO Expander
• Characteristics: High-performance, Low-power, I2C Interface
• Package: 24-pin TSSOP
• Essence: Expand the number of general-purpose input/output (GPIO) pins in a microcontroller or microprocessor-based system.
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage: 1.65V to 5.5V
• Number of GPIO Pins: 8
• I2C Bus Frequency: Up to 400 kHz
• Operating Temperature Range: -40°C to +85°C
• Input/Output Logic Level: 1.8V to 5.5V
• Interrupt Output Pin: Yes
• Address Selection Pins: Yes

Detailed Pin Configuration

The PCAL6408AEX1Z has a total of 24 pins. The pin configuration is as follows:

1. VDD - Supply Voltage
2. GND - Ground
3. SDA - I2C Serial Data
4. SCL - I2C Serial Clock
5. INT - Interrupt Output
6. A0 - Address Selection Bit 0
7. A1 - Address Selection Bit 1
8. RESET - Reset Input
9. P00 - General Purpose I/O Pin 0
10. P01 - General Purpose I/O Pin 1
11. P02 - General Purpose I/O Pin 2
12. P03 - General Purpose I/O Pin 3
13. P04 - General Purpose I/O Pin 4
14. P05 - General Purpose I/O Pin 5
15. P06 - General Purpose I/O Pin 6
16. P07 - General Purpose I/O Pin 7
17. NC - No Connection
18. NC - No Connection
19. NC - No Connection
20. NC - No Connection
21. NC - No Connection
22. NC - No Connection
23. NC - No Connection
24. NC - No Connection

Functional Features

• Expand the number of GPIO pins in a system.
• Supports bidirectional input/output capability on each pin.
• Configurable interrupt output pin for efficient event-driven systems.
• Low standby current consumption, suitable for battery-powered devices.
• Address selection pins allow multiple devices to be used on the same I2C bus.

Advantages and Disadvantages

Advantages

• Provides additional GPIO pins without requiring extra microcontroller pins.
• Easy integration with existing I2C bus systems.
• Low power consumption extends battery life in portable applications.
• Configurable interrupt output simplifies event handling.

Disadvantages

• Limited to 8 additional GPIO pins.
• Requires I2C communication protocol support in the microcontroller.

Working Principles

The PCAL6408AEX1Z is an I2C-controlled GPIO expander. It communicates with the microcontroller or microprocessor through the I2C serial bus. The device acts as a bridge between the microcontroller and external devices, expanding the available GPIO pins. It can be configured as either inputs or outputs, allowing bidirectional communication. The interrupt output pin can be programmed to trigger an interrupt when a specific event occurs on any of the GPIO pins.

Detailed Application Field Plans

The PCAL6408AEX1Z finds applications in various fields, including:

1. Industrial Automation: Used to interface with sensors, actuators, and control devices in automated systems.
2. Consumer Electronics: Enables additional input/output capabilities in devices such as smart home appliances, gaming consoles, and audio systems.
3. Automotive: Integrates with vehicle control systems for controlling lights, switches, and sensors.
4. Internet of Things (IoT): Facilitates connectivity and control in IoT devices, such as smart meters, environmental sensors, and home automation systems.

Detailed and Complete Alternative Models

1. PCAL6416AEX1Z: Similar to PCAL6408AEX1Z but offers 16 GPIO pins instead of 8.
2. MCP23017: I2C-based GPIO expander with 16 GPIO pins and interrupt support.
3. MAX7313: SPI-controlled GPIO expander with 16 GPIO pins and programmable features.

These alternative models provide similar functionality and can be considered based on specific requirements and compatibility with the system.

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