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Rochester Electronics PCA9554PW Environmental and export classification status description

The PCA9554PW is a 16-bit I2C I/O port expander with interrupt capability. It allows microcontrollers to control multiple input/output lines using just two wires for I2C communication, expanding the number of GPIO pins available for various applications. Functions - 16 Bidirectional I/O Pins: Each pin can be configured individually as either an input or an output. - I2C Interface: Communication is handled via the I2C protocol, supporting a maximum bus speed of 1 MHz. - Interrupt Output: The device can notify the host microcontroller of state changes on the input pins via an interrupt signal. - Configurable Pull-Up Resistors: Internal pull-up resistors can be enabled for input pins. - Addressing: Multiple PCA9554 devices can be connected to the same I2C bus thanks to 3 programmable address pins. Applications - Expanding GPIO: Useful in microcontroller projects where more I/O pins are needed, such as Raspberry Pi or Arduino. - Sensor Interfaces: Can be used to interface with multiple sensors in applications such as robotics or home automation. - Control Panels: Acts as a controller for various buttons and LEDs in control panels. - Communication Devices: Enhances the I/O capabilities of communication devices that utilize I2C. Alternative Parts - PCF8574: A similar I2C I/O expander, but with 8 bits instead of 16. - MCP23017: Another 16-bit I/O expander from Microchip Technology, also using I2C. - TCA9535: A 16-bit I/O expander with additional features such as a built-in interrupt consolidator. Embedded Modules - Development Kits: Available in various development kits compatible with the PCA9554, allowing users to prototype and test their designs quickly. - Arduino Shields: Add-on boards that include the PCA9554 or similar GPIO expanders, providing access to more I/O pins for Arduino projects. Related Q&A 1. Q: How do I connect the PCA9554PW to my microcontroller? - A: You will need to connect the SDA (data) and SCL (clock) lines of the PCA9554 to the corresponding I2C pins on your microcontroller, along with power (VCC) and ground (GND). Additionally, you can configure pull-up resistors as needed. 2. Q: Can I use multiple PCA9554 devices on the same I2C bus? - A: Yes, multiple PCA9554 devices can be used on the same I2C bus. Each device has an address that can be set via the A0, A1, and A2 pins, allowing for multiple instances to be identified by the microcontroller. 3. Q: What is the maximum clock frequency for the I2C communication with PCA9554? - A: The PCA9554 supports I2C communication at speeds up to 1 MHz (Fast-mode), allowing for efficient data transfer. 4. Q: What types of applications are best suited for the PCA9554? - A: The PCA9554 is well-suited for applications requiring multiple GPIO lines, including robotics, home automation systems, and any project requiring multiple inputs/outputs, such as buttons and LEDs. 5. Q: Does the PCA9554 support interrupts? - A: Yes, the PCA9554 supports interrupts. It can signal the microcontroller when a change occurs on any of the input pins, facilitating responsive applications without constant polling.