ZHCS616E March 2012 – February 2017 TCA9554
PRODUCTION DATA.
Applications of the TCA9554 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 TCA9554 is typically in a remote location from the master, placed close to the GPIOs to which the master must monitor or control.
IO Expanders such as the TCA9554 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.