TCA9539PWR Frequently Asked Questions (FAQs)

• What is the maximum current that can be sourced or sunk by each I/O pin?
  The maximum current that can be sourced or sunk by each I/O pin is 25mA.
• How do I configure the TCA9539PWR as an input or output?
  The TCA9539PWR can be configured as an input or output by writing to the configuration register (Register 0x03). A '1' in the configuration register sets the corresponding pin as an input, while a '0' sets it as an output.
• What is the purpose of the internal pull-up resistors on the I/O pins?
  The internal pull-up resistors on the I/O pins are used to pull the pins high when they are configured as inputs. This helps to prevent the pins from floating and reduces power consumption.
• How do I reset the TCA9539PWR?
  The TCA9539PWR can be reset by pulling the RESET pin low for a minimum of 1ms. This resets the device to its default state.
• What is the maximum frequency of the I2C clock?
  The maximum frequency of the I2C clock is 400 kHz.