PCA9540BD,112 datasheet by NXP Semiconductors

PCA9540BD,112 Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCA9540BD,112 can support?
  The PCA9540BD,112 can support I2C bus frequencies up to 400 kHz, but it's recommended to limit it to 100 kHz for reliable operation.
• Can I use the PCA9540BD,112 to switch between multiple I2C buses with different voltage levels?
  Yes, the PCA9540BD,112 can switch between multiple I2C buses with different voltage levels, but ensure that the voltage levels are within the recommended operating range of 1.8 V to 5.5 V.
• How do I ensure that the PCA9540BD,112 switches correctly between the multiple I2C buses?
  To ensure correct switching, ensure that the enable pins (EN0-EN3) are properly controlled, and the bus selection pins (A0-A2) are correctly configured according to the datasheet.
• What is the maximum current that the PCA9540BD,112 can sink or source on the I2C bus?
  The PCA9540BD,112 can sink or source up to 3 mA of current on the I2C bus, but it's recommended to limit the current to 1 mA for reliable operation.
• Can I use the PCA9540BD,112 in a hot-swappable I2C bus application?
  Yes, the PCA9540BD,112 is suitable for hot-swappable I2C bus applications, but ensure that the power-up and power-down sequences are properly controlled to avoid bus conflicts.