PCA9555RGERG4 datasheet by Texas Instruments

PCA9555RGERG4 Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCA9555RGERG4 can support?
  The PCA9555RGERG4 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 configure the PCA9555RGERG4 to operate in 8-bit or 16-bit mode?
  The PCA9555RGERG4 is configured to operate in 16-bit mode by default. To operate in 8-bit mode, the A0 and A1 pins must be tied to VCC or GND to select the desired mode.
• What is the maximum current that the PCA9555RGERG4 can sink or source on its GPIO pins?
  The PCA9555RGERG4 can sink or source up to 25 mA of current on its GPIO pins, but it is recommended to limit the current to 10 mA or less to ensure reliable operation.
• How do I reset the PCA9555RGERG4?
  The PCA9555RGERG4 can be reset by pulling the RESET pin low for at least 1 ms. This will reset the device to its default state.
• Can the PCA9555RGERG4 be used as a level translator?
  Yes, the PCA9555RGERG4 can be used as a level translator between 1.8 V and 5 V logic levels. However, it is recommended to use an external voltage translator or level shifter for more reliable operation.