PCA9541AD/01,112 datasheet by NXP Semiconductors

PCA9541AD/01,112 Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCA9541 can handle?
  The PCA9541 can handle I2C bus frequencies up to 400 kHz, but it's recommended to limit it to 100 kHz for reliable operation.
• Can I use the PCA9541 to switch between multiple I2C masters?
  No, the PCA9541 is designed to switch between multiple I2C slaves, not masters. It's a slave multiplexer, not a master multiplexer.
• How do I ensure that the PCA9541 doesn't introduce signal distortion or attenuation on the I2C bus?
  To minimize signal distortion and attenuation, ensure that the PCB layout is designed with short traces, and use a low-impedance output driver on the I2C master. Also, keep the capacitive load on the I2C bus as low as possible.
• Can I use the PCA9541 to switch between I2C buses with different voltage levels?
  No, the PCA9541 is not designed to handle I2C buses with different voltage levels. It's recommended to use level translators or voltage regulators to ensure that all I2C buses operate at the same voltage level.
• How do I handle hot-swapping of I2C slaves with the PCA9541?
  To handle hot-swapping, ensure that the I2C slaves are designed to handle power-on reset and have a stable output during power-up. Also, use a reset signal to the PCA9541 to ensure that it's in a known state during hot-swapping.