PCA9554BS datasheet by Philips Semiconductors

PCA9554BS Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCA9554BS can support?
  The PCA9554BS can support I2C bus frequencies up to 400 kHz, but it is recommended to operate at 100 kHz or lower for reliable operation.
• How do I handle the case where the input voltage is higher than the recommended maximum voltage of 6V?
  If the input voltage is higher than 6V, it is recommended to use a voltage regulator or a voltage divider to reduce the voltage to within the recommended range. Failure to do so may result in damage to the device or unreliable operation.
• What is the maximum current that can be sourced or sunk by the PCA9554BS?
  The PCA9554BS can source or sink up to 25mA of current per pin, but it is recommended to limit the current to 10mA or less to ensure reliable operation and to prevent overheating.
• How do I reset the PCA9554BS to its default state?
  The PCA9554BS can be reset to its default state by pulling the RESET pin low for at least 1ms. This will reset all registers to their default values and disable all outputs.
• Can I use the PCA9554BS as a level translator between 3.3V and 5V systems?
  Yes, the PCA9554BS can be used as a level translator between 3.3V and 5V systems. However, it is recommended to use an external voltage regulator or voltage divider to ensure that the input voltage is within the recommended range.