PCA9546AD,112 datasheet by NXP Semiconductors

PCA9546AD,112 Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that the PCA9546A can support?
  The PCA9546A can support I2C bus frequencies up to 400 kHz, but it's recommended to limit the frequency to 100 kHz to ensure reliable operation.
• Can I use the PCA9546A to switch between multiple I2C masters?
  No, the PCA9546A is designed to switch between multiple I2C buses, not multiple I2C masters. It's intended to allow a single I2C master to access multiple I2C buses.
• How do I ensure that the PCA9546A switches correctly between the different I2C buses?
  To ensure correct switching, make sure to follow the recommended switching sequence in the datasheet, and use the correct control signals (SCL_SEL and SDA_SEL) to select the desired bus.
• What is the maximum capacitance of the I2C bus that the PCA9546A can drive?
  The PCA9546A can drive I2C buses with capacitances up to 400 pF, but it's recommended to keep the bus capacitance as low as possible to ensure reliable operation.
• Can I use the PCA9546A to isolate I2C buses with different voltage levels?
  Yes, the PCA9546A can be used to isolate I2C buses with different voltage levels, but make sure to follow the recommended voltage levels and interface requirements in the datasheet.