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Rochester Electronics PCA9554D Environmental and export classification status description

The PCA9554D is a 16-pin I2C-bus I/O port expander with an open-drain interrupt output. It allows for the expansion of GPIO (General Purpose Input/Output) lines for microcontrollers, enabling them to interface with more devices in applications where I/O resources are limited. The PCA9554D provides a simple interface to add extra GPIOs, which can be useful in various embedded systems. Functions - I2C Interface: The PCA9554D communicates over the I2C bus, allowing multiple devices to connect to the same lines. - GPIO Expansion: The device can expand the number of GPIO pins available to the microcontroller. - Interrupt Output: It has an open-drain interrupt output that signals the host when a GPIO pin state has changed. - Configurable Pins: The GPIO pins can be individually configured as inputs or outputs. Applications - Embedded Systems: Used in microcontroller projects requiring additional I/O pins. - Consumer Electronics: Applied in products that need control over multiple buttons, LEDs, or sensors. - Industrial Automation: Used in applications involving control systems requiring flexible I/O configurations. - Smart Home Devices: Supports devices with multiple sensors and actuators. Alternative Parts - PCA9555: Similar function with up to 16 GPIOs, but slightly different specifications. - PCF8574: 8-bit I/O expander with similar I2C functionality but fewer pins. - MCP23017: A 16-bit I/O expander from Microchip Technology, also offering I2C capability but with some differences in features. - TCA9555: An alternative device with similar functionality and pin configuration. Embedded Modules - Many development boards and kits may support PCA9554D alongside other GPIO expanders, often as part of a larger microcontroller-based system or in various IoT platforms. Related Q&A Q1: What is the main purpose of the PCA9554D? A1: The PCA9554D is primarily used as a GPIO port expander, allowing microcontrollers to increase the number of I/O pins available for interfacing with sensors, switches, and other circuitry through the I2C protocol. Q2: How many GPIO pins does the PCA9554D provide? A2: The PCA9554D provides 8 GPIO pins that can be configured as either inputs or outputs. Q3: Can the PCA9554D generate interrupts? A3: Yes, the PCA9554D features an open-drain interrupt output that can signal the microcontroller when an input pin's state has changed, providing efficient monitoring of GPIO activities. Q4: Is it possible to use multiple PCA9554D devices on the same I2C bus? A4: Yes, multiple PCA9554D devices can be connected to the same I2C bus, as they can be assigned different addresses using their hardware configuration pins. Q5: What type of applications benefit from using the PCA9554D? A5: Applications such as consumer electronics, industrial automation, smart home devices, and any embedded system requiring additional GPIOs benefit from the PCA9554D’s functionality.