PCF8575PWRE4 datasheet by Texas Instruments

PCF8575PWRE4 Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCF8575PWRE4 can support?
  The PCF8575PWRE4 can support I2C bus frequencies up to 400 kHz, but it is recommended to operate at 100 kHz or lower for reliable operation.
• Can the PCF8575PWRE4 be used as a level shifter for I2C signals?
  Yes, the PCF8575PWRE4 can be used as a level shifter for I2C signals, as it can translate between 3.3V and 5V logic levels.
• How do I handle the internal pull-up resistors on the I2C bus?
  The internal pull-up resistors on the I2C bus can be disabled by connecting the PU pin to GND. If not disabled, the internal pull-up resistors will pull the SCL and SDA lines high when the bus is idle.
• What is the maximum current that can be sourced or sunk by the PCF8575PWRE4?
  The PCF8575PWRE4 can source or sink up to 25 mA of current per I/O pin, but the total current should not exceed 100 mA.
• Can the PCF8575PWRE4 be used in a hot-swappable application?
  Yes, the PCF8575PWRE4 can be used in a hot-swappable application, as it has built-in power-on reset and brown-out detection, which helps to prevent data corruption during power-up or power-down sequences.