PCA9543ADR datasheet by Texas Instruments

PCA9543ADR Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that PCA9543ADR can support?
  The PCA9543ADR can support I2C bus frequencies up to 400 kHz, but it's recommended to limit the frequency to 100 kHz for reliable operation.
• Can I use PCA9543ADR to switch between multiple I2C buses with different voltage levels?
  Yes, the PCA9543ADR can switch between multiple I2C buses with different voltage levels, but the voltage on the VCC pin should match the highest voltage of the I2C buses.
• How do I ensure that the PCA9543ADR switches correctly between the two I2C buses?
  To ensure correct switching, the EN pin should be driven high to enable the switch, and the SCL/SDA pins should be driven low to disable the switch. Also, the bus capacitance should be minimized to prevent signal distortion.
• What is the maximum current that the PCA9543ADR can handle?
  The PCA9543ADR can handle a maximum current of 10 mA per channel, but it's recommended to limit the current to 5 mA per channel for reliable operation.
• Can I use PCA9543ADR to switch between I2C buses with different clock frequencies?
  Yes, the PCA9543ADR can switch between I2C buses with different clock frequencies, but the clock frequency should not exceed 400 kHz.