PCA9955TW/Q900,118 datasheet by NXP Semiconductors

PCA9955TW/Q900,118 Frequently Asked Questions (FAQs)

• What is the maximum current rating for each output channel?
  The maximum current rating for each output channel is 10mA, but it's recommended to limit it to 5mA for reliable operation.
• How do I ensure proper thermal management for the PCA9955TW?
  Ensure good airflow around the device, use a heat sink if necessary, and avoid blocking the thermal pad on the bottom of the package.
• What is the recommended clock frequency for the I2C interface?
  The recommended clock frequency for the I2C interface is 100 kHz to 400 kHz, but it can operate up to 1 MHz.
• How do I handle the LED output pins during power-up and power-down sequences?
  Use an external resistor to limit the inrush current during power-up, and consider adding a capacitor to filter out noise during power-down.
• What is the purpose of the internal 10kΩ pull-up resistors on the I2C bus?
  The internal 10kΩ pull-up resistors on the I2C bus are used to pull the SCL and SDA lines high when the bus is idle, ensuring proper communication.