PCA8550DR datasheet by Texas Instruments

PCA8550DR Frequently Asked Questions (FAQs)

• What is the recommended operating voltage range for PCA8550DR?
  The recommended operating voltage range for PCA8550DR is 2.3V to 5.5V, although it can tolerate a voltage range of 1.8V to 6.5V for short periods.
• How do I ensure reliable communication between the PCA8550DR and the microcontroller?
  To ensure reliable communication, make sure to use a pull-up resistor on the SCL line, and use a clock frequency within the recommended range of 10 kHz to 400 kHz. Also, ensure that the microcontroller and PCA8550DR are properly synchronized.
• What is the maximum capacitance that can be driven by the PCA8550DR?
  The PCA8550DR can drive a maximum capacitance of 400 pF on the SDA and SCL lines. Exceeding this limit may cause signal integrity issues.
• How do I handle bus contention and arbitration in a multi-master I2C bus with PCA8550DR?
  In a multi-master I2C bus, bus contention and arbitration can be handled using a combination of hardware and software techniques. The PCA8550DR has built-in arbitration logic, but it's also important to implement software-based arbitration mechanisms to ensure reliable communication.
• What is the maximum number of PCA8550DR devices that can be connected to a single I2C bus?
  The maximum number of PCA8550DR devices that can be connected to a single I2C bus depends on the bus capacitance and the pull-up resistor values. As a general rule, it's recommended to limit the number of devices to 10-15 to ensure reliable communication.