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.

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