TCA6408PW datasheet by Texas Instruments

TCA6408PW Frequently Asked Questions (FAQs)

• What is the maximum frequency of the I2C clock that the TCA6408PW can support?
  The TCA6408PW can support I2C clock frequencies up to 400 kHz, but it's recommended to limit it to 100 kHz for reliable operation.
• How do I handle the power-on reset (POR) of the TCA6408PW?
  The TCA6408PW has an internal POR circuit that resets the device during power-up. To handle POR, ensure that the VCC pin is powered up monotonically and that the I2C bus is not driven during power-up. Also, wait for at least 1 ms after power-up before initiating I2C communication.
• What is the recommended pull-up resistor value for the I2C bus?
  The recommended pull-up resistor value for the I2C bus is between 1 kΩ and 10 kΩ, depending on the bus capacitance and operating frequency. A higher value may be required for longer buses or higher frequencies.
• Can I use the TCA6408PW as a level translator between 3.3V and 5V logic levels?
  Yes, the TCA6408PW can be used as a level translator between 3.3V and 5V logic levels. However, ensure that the VCC pin is connected to the higher voltage level (5V) and that the input signals are within the recommended input voltage range.
• How do I handle the thermal shutdown feature of the TCA6408PW?
  The TCA6408PW has a thermal shutdown feature that disables the device when the junction temperature exceeds 150°C. To handle thermal shutdown, ensure good thermal design and heat dissipation, and monitor the device temperature using an external temperature sensor if necessary.