PCA9555PWRG4 datasheet by Texas Instruments

PCA9555PWRG4 Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCA9555PWRG4 can support?
  The PCA9555PWRG4 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 PCA9555PWRG4 to operate in a specific power mode?
  The PCA9555PWRG4 has three power modes: Normal, Partial Power-Down, and Full Power-Down. These modes can be configured by writing to the Power-Down Control register (0x06) and the Configuration register (0x03). Refer to the datasheet for specific bit settings.
• What is the maximum current that the PCA9555PWRG4 can sink or source on its GPIO pins?
  The PCA9555PWRG4 can sink or source up to 25 mA of current on each GPIO pin, but the total current should not exceed 100 mA for the entire device.
• How do I reset the PCA9555PWRG4 to its default state?
  The PCA9555PWRG4 can be reset to its default state by pulling the RESET pin low for at least 1 ms. This will reset all registers to their default values.
• Can I use the PCA9555PWRG4 as a level translator between 3.3V and 5V systems?
  Yes, the PCA9555PWRG4 can be used as a level translator between 3.3V and 5V systems. The device can operate with a VCC supply voltage of 2.3V to 5.5V, and the GPIO pins can tolerate input voltages up to 5.5V.