PCA9555PWG4 datasheet by Texas Instruments

PCA9555PWG4 Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCA9555PWG4 can support?
  The PCA9555PWG4 can support I2C bus frequencies up to 400 kHz, but it is recommended to operate at 100 kHz or lower for reliable operation.
• How do I configure the PCA9555PWG4 to operate in 8-bit or 16-bit mode?
  The PCA9555PWG4 is configured to operate in 16-bit mode by default. To operate in 8-bit mode, the A0 and A1 pins must be tied to VCC or GND to select the desired mode.
• What is the maximum current that the PCA9555PWG4 can sink or source on each I/O pin?
  The PCA9555PWG4 can sink or source up to 25 mA of current on each I/O pin, but it is recommended to limit the current to 10 mA or less to ensure reliable operation.
• How do I reset the PCA9555PWG4 to its default state?
  The PCA9555PWG4 can be reset to its default state by pulling the RESET pin low for at least 1 ms. This will reset all registers and I/O pins to their default state.
• Can the PCA9555PWG4 be used as a level translator between different voltage domains?
  Yes, the PCA9555PWG4 can be used as a level translator between different voltage domains, but it is limited to translating between 1.8 V, 2.5 V, 3.3 V, and 5 V domains.