PCF8575DB datasheet by Texas Instruments

PCF8575DB Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that PCF8575DB can support?
  The PCF8575DB can support I2C bus frequencies up to 400 kHz, but it's recommended to operate at 100 kHz or lower for reliable operation.
• How do I reset the PCF8575DB?
  The PCF8575DB can be reset by pulling the SCL line low for at least 10 ms. This will reset the device and clear all registers.
• What is the maximum current that can be sourced or sunk by the PCF8575DB?
  The PCF8575DB can source or sink up to 20 mA per I/O pin, but the total current should not exceed 100 mA for the entire device.
• Can I use the PCF8575DB as an input expander only?
  Yes, the PCF8575DB can be used as an input expander only by not writing to the output registers. The device will still respond to I2C commands and provide input data.
• How do I handle interrupts generated by the PCF8575DB?
  The PCF8575DB generates an interrupt on the INT pin when an input changes state. The interrupt can be cleared by reading the input register that triggered the interrupt.