PCF8575DBRE4 datasheet by Texas Instruments

PCF8575DBRE4 Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCF8575DBRE4 can support?
  The PCF8575DBRE4 can support I2C bus frequencies up to 400 kHz in fast mode and 100 kHz in standard mode.
• How do I reset the PCF8575DBRE4?
  The PCF8575DBRE4 can be reset by pulling the SCL line low for at least 10 ms or by powering it down and then back up.
• What is the maximum current that the PCF8575DBRE4 can sink or source per I/O pin?
  The PCF8575DBRE4 can sink or source up to 25 mA per I/O pin.
• Can the PCF8575DBRE4 be used as an input port expander?
  Yes, the PCF8575DBRE4 can be used as an input port expander by configuring the I/O pins as inputs and reading their states through the I2C bus.
• How do I handle bus contention when multiple masters are trying to access the PCF8575DBRE4?
  To handle bus contention, use a bus arbiter or a multiplexer to ensure that only one master can access the PCF8575DBRE4 at a time.