PCF8574TS/3,118 datasheet by NXP Semiconductors

PCF8574TS/3,118 Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCF8574 can support?
  The PCF8574 can support I2C bus frequencies up to 400 kHz.
• How do I reset the PCF8574?
  The PCF8574 can be reset by pulling the SCL line low for at least 10 ms.
• What is the maximum current that the PCF8574 can sink or source?
  The PCF8574 can sink or source up to 25 mA per I/O pin.
• Can I use the PCF8574 as an input expander?
  Yes, the PCF8574 can be used as an input expander by configuring the I/O pins as inputs and reading their states through the I2C bus.
• How do I handle multiple PCF8574 devices on the same I2C bus?
  Each PCF8574 device can be assigned a unique address by connecting the A0, A1, and A2 pins to VCC or GND, allowing multiple devices to share the same I2C bus.