PCF8574ADWR datasheet by Texas Instruments

PCF8574ADWR Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCF8574ADWR can support?
  The PCF8574ADWR can support I2C bus frequencies up to 400 kHz.
• How do I reset the PCF8574ADWR?
  The PCF8574ADWR can be reset by pulling the RESET pin low for a minimum of 1 ms.
• What is the maximum current that the PCF8574ADWR can sink or source per I/O pin?
  The PCF8574ADWR can sink or source up to 25 mA per I/O pin.
• Can the PCF8574ADWR be used as an input port expander?
  Yes, the PCF8574ADWR can be used as an input port expander by configuring the I/O pins as inputs and reading the input values through the I2C bus.
• How do I configure the PCF8574ADWR as an output port expander?
  The PCF8574ADWR can be configured as an output port expander by writing the desired output values to the device through the I2C bus and configuring the I/O pins as outputs.