PCF8574APW datasheet by Texas Instruments

PCF8574APW Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCF8574APW can support?
  The PCF8574APW can support I2C bus frequencies up to 400 kHz.
• Can the PCF8574APW be used as a level shifter for I2C signals?
  Yes, the PCF8574APW can be used as a level shifter for I2C signals, allowing for voltage translation between 1.8V, 2.5V, 3.3V, and 5V.
• How do I reset the PCF8574APW?
  The PCF8574APW can be reset by pulling the RESET pin low for a minimum of 1 ms. This will reset the device and clear all registers.
• What is the maximum current that the PCF8574APW can sink or source on its I/O pins?
  The PCF8574APW can sink or source up to 25 mA of current on its I/O pins.
• Can the PCF8574APW be used in a multi-master I2C bus configuration?
  Yes, the PCF8574APW can be used in a multi-master I2C bus configuration, but it requires external circuitry to handle arbitration and collision detection.