PCA9542APW datasheet by NXP Semiconductors

PCA9542APW Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCA9542APW can support?
  The PCA9542APW 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 the PCA9542APW to switch between multiple I2C buses with different voltage levels?
  Yes, the PCA9542APW can switch between multiple I2C buses with different voltage levels, but the voltage on the SCL and SDA pins must not exceed the VCC supply voltage of the device.
• How do I ensure that the PCA9542APW switches correctly between the different I2C buses?
  To ensure correct switching, the control input (A0, A1, or A2) must be set to the correct logic level before the I2C transaction, and the bus must be idle (no I2C transaction in progress) when switching between buses.
• What is the maximum capacitance that the PCA9542APW can drive on the I2C bus?
  The PCA9542APW can drive a maximum capacitance of 400 pF on the I2C bus, but it's recommended to limit the capacitance to 100 pF for reliable operation.
• Can I use the PCA9542APW to isolate I2C buses with different clock domains?
  Yes, the PCA9542APW can be used to isolate I2C buses with different clock domains, but the clock domains must be synchronized to ensure correct data transfer.