PCA9554DB datasheet by Texas Instruments

PCA9554DB Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that PCA9554DB can support?
  The PCA9554DB can support I2C bus frequencies up to 400 kHz.
• How do I reset the PCA9554DB?
  The PCA9554DB can be reset by pulling the RESET pin low for a minimum of 1 ms. This will reset the device to its default state.
• What is the maximum current that the PCA9554DB can sink or source on each GPIO pin?
  The PCA9554DB can sink or source up to 25 mA of current on each GPIO pin.
• Can I use the PCA9554DB as a level translator?
  Yes, the PCA9554DB can be used as a level translator. It can translate signals from 1.8 V to 5 V or vice versa.
• How do I configure the PCA9554DB for input or output mode?
  The PCA9554DB can be configured for input or output mode by writing to the configuration register (register 0x06). A '1' in the register sets the pin as an input, while a '0' sets it as an output.