PCA9538ABSHP datasheet by NXP Semiconductors

PCA9538ABSHP Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCA9538 can support?
  The PCA9538 can support I2C bus frequencies up to 400 kHz.
• How do I configure the PCA9538 to operate in 8-bit or 16-bit mode?
  The PCA9538 can be configured to operate in 8-bit or 16-bit mode by setting the MODE pin high or low, respectively, during power-up or reset.
• What is the maximum current that the PCA9538 can sink or source on each output pin?
  The PCA9538 can sink or source up to 25 mA of current on each output pin.
• How do I reset the PCA9538?
  The PCA9538 can be reset by pulling the RESET pin low for at least 1 ms, or by performing a power-on reset.
• What is the purpose of the INT pin on the PCA9538?
  The INT pin is an active-low interrupt output that can be used to signal to the microcontroller that an input has changed state or that a fault has occurred.