ZHCSJJ3E July 2009 – April 2019 TCA9555
PRODUCTION DATA.
Applications of the TCA9555 has this device connected as a slave to an I2C master (processor), and the I2C bus may contain any number of other slave devices. The TCA9555 is typically be in a remote location from the master, placed close to the GPIOs to which the master needs to monitor or control.
IO Expanders such as the TCA9555 are typically used for controlling LEDs (for feedback or status lights), controlling enable or reset signals of other devices, and even reading the outputs of other devices or buttons.