PCF8575DBR datasheet by Texas Instruments

PCF8575DBR Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCF8575DBR can support?
  The PCF8575DBR can support I2C bus frequencies up to 400 kHz, but it's recommended to operate at 100 kHz for reliable operation.
• How do I reset the PCF8575DBR?
  The PCF8575DBR can be reset by pulling the RESET pin low for at least 1 ms. This will reset the device and clear all registers.
• What is the maximum current that the PCF8575DBR can sink or source?
  The PCF8575DBR can sink or source up to 25 mA of current per I/O pin, but the total current should not exceed 100 mA.
• Can I use the PCF8575DBR as an input expander?
  Yes, the PCF8575DBR can be used as an input expander. The device can be configured to read the state of the input pins and transmit the data to the I2C bus.
• How do I address multiple PCF8575DBR devices on the same I2C bus?
  You can address multiple PCF8575DBR devices on the same I2C bus by connecting the A0, A1, and A2 pins to different logic levels to create a unique address for each device.