PCF8577CT datasheet by Philips Semiconductors

PCF8577CT Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCF8577CT can handle?
  The PCF8577CT can handle 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 PCF8577CT?
  The PCF8577CT can be reset by pulling the SCL line low for at least 10 ms. This will reset the device and clear all internal registers.
• What is the maximum current that can be sourced or sunk by the PCF8577CT?
  The PCF8577CT 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 PCF8577CT as a level shifter?
  Yes, the PCF8577CT can be used as a level shifter between 5V and 3.3V systems, but it's not recommended to use it as a level shifter for high-speed signals.
• How do I handle bus contention on the I2C bus when using multiple PCF8577CT devices?
  To handle bus contention, use a unique address for each PCF8577CT device by connecting the A0, A1, and A2 pins to VCC or GND. You can also use an I2C bus arbiter or a multiplexer to manage multiple devices on the same bus.