NXP USA Inc.
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PCAL6408AHKX
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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.

Énumérez 10 questions et réponses courantes liées à l'application de PCAL6408AHKX dans les solutions techniques

Sure! Here are 10 common questions and answers related to the application of PCAL6408AHKX in technical solutions:

  1. Q: What is PCAL6408AHKX? A: PCAL6408AHKX is a 8-bit general-purpose input/output (GPIO) expander with I2C interface, which allows you to expand the number of GPIO pins available on your microcontroller or system.

  2. Q: What is the maximum voltage that PCAL6408AHKX can handle? A: PCAL6408AHKX can handle a maximum voltage of 5.5V.

  3. Q: How many GPIO pins does PCAL6408AHKX provide? A: PCAL6408AHKX provides 8 GPIO pins that can be configured as either inputs or outputs.

  4. Q: Can PCAL6408AHKX be used with both 3.3V and 5V microcontrollers? A: Yes, PCAL6408AHKX is compatible with both 3.3V and 5V microcontrollers as it supports both voltage levels.

  5. Q: How do I communicate with PCAL6408AHKX using I2C? A: You can communicate with PCAL6408AHKX using the I2C protocol by sending commands and data over the I2C bus.

  6. Q: Can PCAL6408AHKX generate interrupts? A: Yes, PCAL6408AHKX has interrupt functionality that can be configured to trigger an interrupt when a specific GPIO pin changes its state.

  7. Q: What is the maximum current that each GPIO pin of PCAL6408AHKX can source/sink? A: Each GPIO pin of PCAL6408AHKX can source/sink a maximum current of 25mA.

  8. Q: Can PCAL6408AHKX be used in automotive applications? A: Yes, PCAL6408AHKX is designed to meet the requirements of automotive applications and can operate in harsh environments.

  9. Q: Does PCAL6408AHKX have built-in pull-up or pull-down resistors? A: Yes, PCAL6408AHKX has programmable internal pull-up or pull-down resistors that can be enabled for each GPIO pin individually.

  10. Q: Is PCAL6408AHKX available in different package options? A: Yes, PCAL6408AHKX is available in different package options such as TSSOP and VQFN, allowing you to choose the one that suits your application best.

Please let me know if you have any more questions!