The TCA9539RGER is a versatile, low-voltage 16-bit I2C and SMBus low-power I/O expander from Texas Instruments. This integrated circuit is designed to provide general-purpose remote I/O expansion for most microcontroller families via the I2C interface, which is particularly useful in applications where pins are limited.

Key Features

• Interface: The device features an I2C-bus/SMBus interface with a 400-kHz Fast-mode Plus (Fm+) that ensures high-speed communication with a host controller.
• Voltage Range: It operates within a voltage range of 1.65 to 5.5 V, making it suitable for a wide array of applications and compatible with various logic levels.
• Expandability: Up to eight TCA9539 devices can be connected to the same I2C-bus or SMBus, providing up to 128 additional I/Os.
• Configurability: Each I/O can be configured as either an input or an output, giving the user flexibility in customizing the device's setup according to the needs of their application.
• Interrupt Output: An interrupt output is available and is activated when any input state differs from its corresponding Input Port register state, helping to avoid the need for the host controller to continuously poll the inputs.
• Power-Up State: All I/Os are set to inputs at power-up to prevent inadvertent outputs that may cause issues during system initialization.
• Polarity Inversion: The device supports polarity inversion for each input port bit, which is useful for correcting bus signal polarities.

Applications

The TCA9539RGER is ideal for a range of applications including:

• Server motherboards
• Industrial control
• Personal electronics
• Medical equipment
• Automotive systems

With its robust feature set and Texas Instruments' reputation for high-quality components, the TCA9539RGER is an excellent choice for designers looking to expand the I/O capabilities of their microcontroller-based systems.