PCF8575PWR datasheet by Texas Instruments

PCF8575PWR Frequently Asked Questions (FAQs)

• What is the maximum current that can be sourced or sunk by the PCF8575PWR?
  The PCF8575PWR can source up to 20mA and sink up to 24mA per I/O pin.
• How do I ensure that the PCF8575PWR is properly reset after power-up?
  The PCF8575PWR has a power-on reset (POR) circuit that resets the device after power-up. However, it's recommended to add an external reset circuit to ensure a clean reset signal.
• What is the maximum frequency of the I2C clock that the PCF8575PWR can support?
  The PCF8575PWR can support I2C clock frequencies up to 400 kHz.
• Can the PCF8575PWR be used in a 5V system?
  Yes, the PCF8575PWR is 5V tolerant, but it's recommended to use a voltage regulator to ensure a stable 3.3V supply to the device.
• How do I configure the PCF8575PWR as an input or output?
  The PCF8575PWR is configured as an input or output by writing to the corresponding register. A '1' in the register sets the pin as an input, while a '0' sets it as an output.