PCA9544AD datasheet by NXP Semiconductors

PCA9544AD Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCA9544AD can handle?
  The PCA9544AD can handle I2C bus frequencies up to 400 kHz, but it's recommended to limit the frequency to 100 kHz for reliable operation.
• Can I use the PCA9544AD to switch between multiple I2C buses with different voltage levels?
  Yes, the PCA9544AD can switch between multiple I2C buses with different voltage levels, but the voltage on the SCL and SDA pins must be within the recommended operating range of 1.8 V to 5.5 V.
• How do I ensure that the PCA9544AD switches correctly between the different I2C buses?
  To ensure correct switching, make sure to follow the recommended switching sequence and timing in the datasheet, and use the correct control signals (EN, SEL0, and SEL1) to select the desired bus.
• What is the maximum capacitance of the I2C bus that the PCA9544AD can drive?
  The PCA9544AD can drive I2C buses with capacitances up to 400 pF, but it's recommended to keep the bus capacitance as low as possible to ensure reliable operation.
• Can I use the PCA9544AD to switch between I2C buses with different clock stretching requirements?
  Yes, the PCA9544AD can handle I2C buses with different clock stretching requirements, but the device may not be able to stretch the clock signal indefinitely. Make sure to check the datasheet for specific clock stretching limitations.