PCA9540BD,118 datasheet by NXP Semiconductors

PCA9540BD,118 Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCA9540BD,118 can support?
  The PCA9540BD,118 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,118 to switch between multiple I2C buses with different voltage levels?
  Yes, the PCA9540BD,118 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,118 switches correctly between the two I2C buses?
  To ensure correct switching, ensure that the SEL pin is properly driven with a valid logic level (either high or low) and that the bus is properly terminated with pull-up resistors.
• What is the maximum current that the PCA9540BD,118 can sink or source on the I2C bus?
  The PCA9540BD,118 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,118 in a hot-swappable application?
  Yes, the PCA9540BD,118 is suitable for hot-swappable applications, but ensure that the power supply is properly sequenced and that the device is properly reset after a hot-swap event.