PCA9548AD datasheet by NXP Semiconductors

PCA9548AD Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C bus that PCA9548AD can support?
  The PCA9548AD 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 PCA9548AD to switch between multiple I2C buses with different voltage levels?
  Yes, the PCA9548AD 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 0.8 V to 5.5 V.
• How do I ensure that the PCA9548AD switches correctly between the different I2C buses?
  To ensure correct switching, the control signals (A0, A1, and EN) must be driven with a valid logic level (VIL or VIH) and the bus capacitance must be within the specified range. Additionally, the I2C bus must be idle before switching to a new bus.
• What is the maximum number of PCA9548AD devices that can be cascaded?
  There is no theoretical limit to the number of PCA9548AD devices that can be cascaded, but the total bus capacitance and the number of devices on each bus must be within the specified limits to ensure reliable operation.
• Can I use PCA9548AD to switch between I2C buses with different clock stretching requirements?
  Yes, the PCA9548AD can switch between I2C buses with different clock stretching requirements, but the device must be configured to accommodate the longest clock stretching time required by any of the buses.