TCA9554PWR datasheet by Texas Instruments

TCA9554PWR Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the TCA9554PWR can support?
  The TCA9554PWR can support I2C bus frequencies up to 400 kHz.
• How do I configure the TCA9554PWR to operate in input mode?
  To configure the TCA9554PWR to operate in input mode, set the corresponding bit in the configuration register (register 0x03) to 1. This will enable the input mode for the respective pin.
• What is the maximum current that the TCA9554PWR can sink or source per pin?
  The TCA9554PWR can sink or source up to 25 mA per pin.
• How do I reset the TCA9554PWR?
  The TCA9554PWR can be reset by pulling the RESET pin low for at least 1 ms. This will reset the device to its default state.
• What is the purpose of the internal pull-up resistors on the TCA9554PWR?
  The internal pull-up resistors on the TCA9554PWR are used to pull up the I2C bus lines (SCL and SDA) to the supply voltage (VCC) when the device is not actively driving the bus.