PCA9551D,112 datasheet by NXP Semiconductors

PCA9551D,112 Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCA9551D,112 can support?
  The PCA9551D,112 can support I2C bus frequencies up to 400 kHz.
• How do I configure the PCA9551D,112 to operate in input mode?
  To configure the PCA9551D,112 to operate in input mode, set the corresponding bit in the configuration register (register 0x06) to '1'. This will configure the pin as an input.
• What is the maximum current that the PCA9551D,112 can sink or source per pin?
  The PCA9551D,112 can sink or source up to 25 mA per pin.
• How do I reset the PCA9551D,112?
  The PCA9551D,112 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 purpose of the internal pull-up resistors on the PCA9551D,112?
  The internal pull-up resistors on the PCA9551D,112 are used to pull up the I2C bus lines (SCL and SDA) to the supply voltage (VCC) when the device is not actively driving the bus.