The PCA9555PW,118 is an I/O expander manufactured by NXP. It is a 16-bit, I2C family I/O expander with flexible GPIO and interrupt capability. It operates from a single 1.8V to 5.5V supply. The device features an extended operating temperature range of -40°C to +125°C, and provides 16-bit GPIO organization with programmable pull-up options on each port, enabling robust system performance and superior immunity to system noise. The device also offers two separate interrupt inputs, one for each port, that are individually programmable and can be used to wake up host suspensions. The PCA9555PW,118 is optimized for I2C bus speed and features an ‘open-drain’ interrupt output that allows the device to act as an intelligent device on the I2C bus.