PCA9555DB datasheet by Philips Semiconductors

PCA9555DB Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCA9555DB can support?
  The PCA9555DB 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 reset the PCA9555DB?
  The PCA9555DB can be reset by pulling the RESET pin low for at least 1 ms. This will reset the device to its default state.
• What is the maximum current that the PCA9555DB can sink or source on its I/O pins?
  The PCA9555DB can sink or source up to 25 mA of current on its I/O pins, but it is recommended to limit the current to 10 mA or less to ensure reliable operation.
• Can I use the PCA9555DB as a level translator between 3.3V and 5V systems?
  Yes, the PCA9555DB can be used as a level translator between 3.3V and 5V systems, but it is recommended to use external resistors to limit the current and voltage on the I/O pins.
• How do I configure the PCA9555DB to operate in input mode?
  To configure the PCA9555DB to operate in input mode, set the corresponding bit in the configuration register (register 0x06) to 1. This will configure the I/O pin as an input.