• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 33 subscribers
  • Views 134 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TCA9617A: what if we use this device as SCI/UART level shift?

justifice zhou
Intellectual 400 points
Part Number: TCA9617A
Other Parts Discussed in Thread: SN74AXC2T245, TXU0202,

Hi,

I've already use this device as SCI level shift from 1.8V to 3.3V.

But the datasheet says it's designed for IIC.

Are there any risk for me to use it as SCI interface, TX connected to SCL, RX connected to SDA.

  • 0
    Guru 260250 points

    What is "SCI"? Scalable Coherent Interface? Serial Communication Interface?

    As an I²C buffer, the TCA9617A is optimized for low speeds and bidirectional, open-drain signals. It can work with UART signals, but a better choice would be the TXU0202 or SN74AXC2T245.

  • +1
    TI__Mastermind 27353 points

    Justifice,

    I second what Clemens stated, are you referring to Scalable Coherent Interface / Serial Communication Interface? Did you mean to say SPI? 

    TCA9617A is designed for I2C but can pass signals that are not I2C. There is no I2C communication needed for the TCA9617A device in order to operate it. TCA9617A does not have an addressable slave address, nor does it drive any signals back to the master (ACK/NACK). TCA9617A is a level-translating buffer repeater with bi-directional capability, and simply looks at the voltage threshold on the driving side to determine the logic state on the output side (drive high or drive low). These input thresholds are defined by the VIH and VIL parameters listed in the datasheet. 

    There should not be any risk to connected TX / RX signals to the SDA or SCL lines as long as the device electrical recommendations are met, and logic levels for producing a high or low logic output. 

    Regards,

    Tyler

  • 0 in reply to Clemens Ladisch
    Intellectual 400 points

    Thanks, I mean serial communication interface.

  • 0 in reply to justifice zhou
    TI__Mastermind 27353 points

    Justifice,

    This should work for serial communication as long as the voltage thresholds are respected for proper use of the device when determining a high or low logic signal. 

    Regards,

    Tyler