PCA9557RGYR datasheet by Texas Instruments

PCA9557RGYR Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCA9557RGYR can support?
  The PCA9557RGYR can support I2C bus frequencies up to 400 kHz.
• How do I configure the PCA9557RGYR to operate in 8-bit or 16-bit mode?
  The PCA9557RGYR can be configured to operate in 8-bit or 16-bit mode by setting the MODE pin high or low, respectively, during power-up.
• What is the maximum current that the PCA9557RGYR can sink or source on each GPIO pin?
  The PCA9557RGYR can sink or source up to 25 mA of current on each GPIO pin.
• How do I reset the PCA9557RGYR?
  The PCA9557RGYR can be reset by pulling the RESET pin low for at least 1 ms.
• What is the purpose of the INT pin on the PCA9557RGYR?
  The INT pin is an active-low interrupt output that is asserted when a change is detected on any of the GPIO pins.