PCF8574P datasheet by Philips Semiconductors

PCF8574P Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCF8574P can handle?
  The PCF8574P can handle I2C bus frequencies up to 400 kHz.
• Can the PCF8574P be used as a level shifter for 5V and 3.3V systems?
  Yes, the PCF8574P can be used as a level shifter for 5V and 3.3V systems, but it requires an external voltage regulator to generate the required voltage levels.
• How do I reset the PCF8574P?
  The PCF8574P can be reset by pulling the SCL line low for at least 10 ms, or by powering down and then powering up the device again.
• What is the maximum current that the PCF8574P can sink or source?
  The PCF8574P can sink or source up to 25 mA of current per I/O pin.
• Can the PCF8574P be used in a multi-master I2C bus configuration?
  Yes, the PCF8574P can be used in a multi-master I2C bus configuration, but it requires careful consideration of the bus arbitration and collision detection mechanisms.