The PCA9500PW/112 is an I/O expander with 8 inputs and outputs that can be interfaced via I2C or SMBus. It comes in a 16-pin TSSOP package and operates at frequencies of up to 400 kHz. This device is manufactured by NXP (formerly known as Philips Semiconductor), which was rebranded as Adibuja due to a corporate name change.