PCAL6408AHKX

Product Overview

• Category: Integrated Circuit
• Use: GPIO Expander
• Characteristics: High-speed, low-power, 8-bit I/O expander
• Package: 24-pin TSSOP
• Essence: Expands the number of available general-purpose input/output (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 Levels: 1.8V to 5.5V
• Maximum I/O Current: ±4mA
• Operating Temperature Range: -40°C to +85°C
• Interface: I2C-compatible, supports standard and fast mode (up to 400kHz)

Detailed Pin Configuration

The PCAL6408AHKX has a total of 24 pins. The pin configuration is as follows:

1. VDD - Power supply voltage
2. GND - Ground
3. SDA - Serial data input/output for I2C communication
4. SCL - Serial clock input for I2C communication
5. INT - Interrupt output
6. RESET - Reset input
7. A0 - Address bit 0
8. A1 - Address bit 1
9. A2 - Address bit 2
10. P0 - General-purpose I/O pin 0
11. P1 - General-purpose I/O pin 1
12. P2 - General-purpose I/O pin 2
13. P3 - General-purpose I/O pin 3
14. P4 - General-purpose I/O pin 4
15. P5 - General-purpose I/O pin 5
16. P6 - General-purpose I/O pin 6
17. P7 - General-purpose I/O pin 7
18. VREF - Reference voltage for I/O levels
19. SDA1 - Second serial data input/output for cascading multiple devices
20. SCL1 - Second serial clock input for cascading multiple devices
21. NC - No connection
22. NC - No connection
23. NC - No connection
24. NC - No connection

Functional Features

• Provides additional GPIO pins for microcontrollers with limited I/O capabilities
• Supports bidirectional I/O and open-drain outputs
• Configurable interrupt output for efficient event-driven systems
• Low standby current consumption for power-sensitive applications
• Address pins allow up to eight devices to be connected on the same I2C bus

Advantages and Disadvantages

Advantages: - Increases the number of available I/O pins without requiring additional microcontroller pins - Flexible configuration options for different applications - Low power consumption - Wide operating voltage range

Disadvantages: - Limited number of I/O pins (8 in total) - Requires I2C communication interface support from the microcontroller

Working Principles

The PCAL6408AHKX is an I2C-compatible GPIO expander. It communicates with a microcontroller or other digital device using the I2C protocol. The microcontroller sends commands and data to the PCAL6408AHKX, which then controls the state of its I/O pins accordingly. The device can be configured to operate in different modes, such as input, output, or interrupt mode, depending on the application requirements.

Detailed Application Field Plans

The PCAL6408AHKX can be used in various applications, including but not limited to:

1. Industrial automation systems
2. Home automation systems
3. Internet of Things (IoT) devices
4. Consumer electronics
5. Automotive electronics
6. Medical devices

Detailed and Complete Alternative Models

1. PCAL6416AHKX: Similar to PCAL6408AHKX, but with 16 I/O pins instead of 8.
2. MCP23008: Another 8-bit I/O expander with I2C interface.
3. MAX7313: 16-bit I/O expander with I2C/SMBus interface.
4. TCA9539: 16-bit I/O expander with I2C interface and interrupt support.

These alternative models offer similar functionality and can be considered as alternatives to the PCAL6408AHKX depending on specific requirements.

In conclusion, the PCAL6408AHKX is a high-speed, low-power GPIO expander that provides additional I/O pins for microcontrollers or digital devices. Its compact package, wide operating voltage range, and flexible configuration options make it suitable for various applications in different industries.