PCF8575TS/1,112 datasheet by NXP Semiconductors

PCF8575TS/1,112 Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCF8575 can support?
  The PCF8575 can support I2C bus frequencies up to 400 kHz.
• How do I reset the PCF8575?
  The PCF8575 can be reset by pulling the SCL line low for at least 10 ms.
• What is the maximum current that the PCF8575 can sink or source?
  The PCF8575 can sink or source up to 25 mA per I/O pin.
• Can I use the PCF8575 as an input port expander?
  Yes, the PCF8575 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 interrupts generated by the PCF8575?
  The PCF8575 generates an interrupt signal on the INT pin when an input pin changes state. The interrupt can be cleared by reading the input port register.