PCA9555PW,118
Overview
The PCA9555PW is a 16-bit I/O expander designed for I2C and SMBus applications, providing a simple way to add additional general-purpose I/O to a microcontroller. It features two 8-bit ports with push-pull outputs, an active-LOW interrupt output, and internal power-on reset. This device is particularly useful for managing sensors, switches, and LEDs when the host processor has limited GPIO pins.
Why Choose This Part
The component offers high flexibility with a wide supply voltage range of 2.3V to 5.5V and 50mA maximum I/O output current capability. It includes a Polarity Inversion register for software-based logic control and an internal noise filter on SCL/SDA to ensure reliable communication in noisy environments.
Applications
Key Specifications
Getting Started
To integrate this part, connect SCL and SDA to the host I2C bus and pull the A0, A1, and A2 address pins to VDD or Ground to set the device address. Engineers can verify communication by reading the Input Port registers or toggling the Configuration registers to set pins as outputs. Ensure the interrupt line (INT) is connected to a GPIO with an internal or external pull-up resistor to handle asynchronous events.
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