Texas Instruments
L'image peut être une représentation.
Voir les spécifications pour les détails du produit.
TCA6408RGTR
Voir les détails DataSheets

TCA6408RGTR

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 - High-speed I2C bus interface - Schmitt-trigger action on all inputs - Open-drain active-low interrupt output - ESD protection exceeds JESD 22

Package: QFN (Quad Flat No-Lead)

Essence: The TCA6408RGTR is a versatile GPIO expander designed to provide additional input/output ports for microcontrollers or other digital devices.

Packaging/Quantity: The TCA6408RGTR is available in a reel packaging with 2500 units per reel.

Specifications

  • Supply Voltage Range: 1.65V to 5.5V
  • I/O Voltage Range: 1.8V to 5.5V
  • I2C Bus Frequency: Up to 400 kHz
  • Operating Temperature Range: -40°C to +85°C
  • Input Capacitance: 3 pF
  • Output Capacitance: 6 pF
  • Input Leakage Current: ±1 µA
  • Output Sink Current: 25 mA
  • Output Source Current: -25 mA

Pin Configuration

The TCA6408RGTR has a total of 20 pins, which are assigned as follows:

  • VCC: Power supply voltage
  • GND: Ground
  • SDA: Serial data input/output pin for I2C communication
  • SCL: Serial clock input pin for I2C communication
  • INT: Active-low interrupt output
  • P0-P7: General-purpose I/O pins

Functional Features

  1. I2C Interface: The TCA6408RGTR utilizes the I2C bus interface for communication with a microcontroller or other devices, allowing for easy integration into existing systems.

  2. Expandable GPIO: With 8-bit I/O capability, this IC provides additional input/output ports, enabling the control of multiple devices using a single microcontroller.

  3. Schmitt-Trigger Action: All inputs of the TCA6408RGTR feature Schmitt-trigger action, ensuring reliable and noise-immune signal detection.

  4. Interrupt Output: The active-low interrupt output (INT) can be configured to indicate changes in the state of the I/O pins, providing efficient event-driven functionality.

Advantages

  • Low power consumption makes it suitable for battery-powered applications.
  • Wide operating voltage range allows compatibility with various systems.
  • High-speed I2C bus interface enables fast data transfer.
  • Schmitt-trigger action ensures robust signal detection.
  • ESD protection exceeds industry standards, enhancing device reliability.

Disadvantages

  • Limited number of I/O pins may not suffice for complex applications requiring numerous connections.
  • Lack of built-in pull-up resistors may require external components for certain configurations.

Working Principles

The TCA6408RGTR operates by receiving commands and data through the I2C interface from a master device, typically a microcontroller. It interprets these commands to control the state of its 8-bit I/O pins. The Schmitt-trigger action on the inputs ensures accurate signal detection, while the interrupt output provides a means of notifying the master device about pin state changes.

Application Field Plans

The TCA6408RGTR finds application in various fields, including but not limited to:

  1. Industrial Automation: Used for controlling sensors, actuators, and peripheral devices in industrial automation systems.

  2. Home Automation: Enables the expansion of input/output capabilities in home automation systems, facilitating the control of lights, appliances, and security devices.

  3. Consumer Electronics: Integrated into consumer electronic devices to provide additional I/O ports for user interface elements, such as buttons and LEDs.

  4. Internet of Things (IoT): Supports IoT applications by extending the number of available GPIOs for connecting sensors, actuators, and communication modules.

Alternative Models

  1. PCA9538RGTR: 8-bit I/O expander with I2C interface, similar specifications to TCA6408RGTR.
  2. MCP23008-I/SS: 8-bit I/O expander with I2C interface, compatible pin configuration, and comparable features.
  3. SX1509QSGTR: 16-channel I/O expander with I2C interface, offers increased I/O capacity compared to TCA6408RGTR.

These alternative models can be considered based on specific project requirements and desired functionality.

Word Count: 554 words

Énumérez 10 questions et réponses courantes liées à l'application de TCA6408RGTR dans les solutions techniques

Sure! Here are 10 common questions and answers related to the application of TCA6408RGTR in technical solutions:

  1. Q: What is TCA6408RGTR? A: TCA6408RGTR is an 8-bit I/O expander with I2C interface, which allows you to expand the number of GPIO pins available in your microcontroller.

  2. Q: What is the operating voltage range for TCA6408RGTR? A: The operating voltage range for TCA6408RGTR is typically between 1.65V and 5.5V.

  3. Q: How many GPIO pins can be controlled using TCA6408RGTR? A: TCA6408RGTR provides 8 GPIO pins that can be individually controlled as inputs or outputs.

  4. Q: Can TCA6408RGTR handle interrupts? A: Yes, TCA6408RGTR has interrupt functionality that can be configured to trigger when a pin's state changes.

  5. Q: What is the maximum current that can be sourced/sunk by each GPIO pin? A: Each GPIO pin of TCA6408RGTR can source/sink up to 25mA of current.

  6. Q: Can TCA6408RGTR be used with both 3.3V and 5V microcontrollers? A: Yes, TCA6408RGTR is compatible with both 3.3V and 5V microcontrollers, thanks to its wide operating voltage range.

  7. Q: Is it possible to control TCA6408RGTR from multiple microcontrollers simultaneously? A: No, TCA6408RGTR does not support multi-master operation. Only one microcontroller can control it at a time.

  8. Q: Can TCA6408RGTR be used to drive LEDs directly? A: Yes, TCA6408RGTR can be used to drive LEDs directly by configuring the GPIO pins as outputs and connecting them to the LED cathodes.

  9. Q: Does TCA6408RGTR have built-in pull-up resistors? A: Yes, TCA6408RGTR has programmable internal pull-up resistors that can be enabled or disabled for each GPIO pin individually.

  10. Q: What is the I2C address of TCA6408RGTR? A: The I2C address of TCA6408RGTR is determined by the state of its three address pins (A0, A1, and A2), allowing up to 8 devices to be connected on the same bus.

Please note that these answers are general and may vary depending on the specific implementation and datasheet of TCA6408RGTR.