PCA9541PW/03 datasheet by NXP Semiconductors

PCA9541PW/03 Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCA9541PW/03 can support?
  The PCA9541PW/03 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 PCA9541PW/03 to switch between multiple I2C buses with different voltage levels?
  Yes, the PCA9541PW/03 can switch between multiple I2C buses with different voltage levels, but the voltage on the SCL and SDA pins must be within the specified range of 0.8V to 5.5V.
• How do I ensure that the PCA9541PW/03 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 activity) during the switching process.
• What is the maximum capacitance of the I2C bus that the PCA9541PW/03 can drive?
  The PCA9541PW/03 can drive I2C buses with capacitances up to 400 pF, but it's recommended to limit the capacitance to 200 pF for reliable operation.
• Can I use the PCA9541PW/03 to switch between I2C buses with different pull-up resistor values?
  Yes, the PCA9541PW/03 can switch between I2C buses with different pull-up resistor values, but the pull-up resistors must be within the specified range of 1 kΩ to 10 kΩ.