PCA9544APWRG4 datasheet by Texas Instruments

PCA9544APWRG4 Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCA9544A can support?
  The PCA9544A can support I2C bus frequencies up to 400 kHz, but it's recommended to limit the frequency to 100 kHz to ensure reliable operation.
• Can I use the PCA9544A to switch between multiple I2C buses with different voltage levels?
  Yes, the PCA9544A 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 1.65 V to 5.5 V.
• How do I ensure that the PCA9544A 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 a pull-up resistor on the SCL and SDA pins of each bus.
• Can I use the PCA9544A to switch between I2C buses with different clock stretching requirements?
  Yes, the PCA9544A can handle clock stretching on each bus independently, but the master device must be able to handle the clock stretching requirements of each bus.
• What is the maximum capacitance of the I2C bus that the PCA9544A can drive?
  The PCA9544A can drive I2C buses with capacitance up to 400 pF, but the actual capacitance limit may be lower depending on the specific application and operating conditions.