PCA9555AHF
Overview
The PCA9555AHF is a 16-bit I/O expander designed for I2C-bus or SMBus applications, providing a remote I/O solution for microcontrollers via a two-wire interface. It features a wide operating voltage range of 1.65V to 5.5V and includes an interrupt output to notify the host processor of input state changes. The device is packaged in a space-saving HWQFN24, making it suitable for high-density embedded designs.
Why Choose This Part
The PCA9555AHF offers high flexibility with individual pin configuration as input or output and includes internal power-on reset to ensure a clean start. Its extremely low standby current of approximately 1.7uA and low active power consumption make it an excellent choice for battery-powered or energy-sensitive electronics.
Applications
Getting Started
To evaluate this part, connect the I2C SDA and SCL lines to your host controller and use three address pins to set the unique bus address. Software development can be accelerated using standard I2C libraries that support the PCA9555 register map, which consists of Input, Output, Polarity Inversion, and Configuration registers.
Also Consider
NXP Semiconductors
- Similar 16-bit expander functionality but without the internal pull-up resistors found in the PCA9555 series.
