• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 33 subscribers
  • Views 85 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

TLIN1024A-Q1: Not able to set Enable pin

Narmatha T
Prodigy 10 points
Part Number: TLIN1024A-Q1


Tool/software:

Hello team,

During tests with the TLIN1024A device, we are giving the Vsup as 12 V. From the data sheet it is mentioned as 3.3V - 5V for EN pin.

We are giving the the 5V from the power supply to the EN pin but still EN pin voltage as higher than the 5V. Enable pin from the transceiver not set as high.

Could you please provide clarification on this behavior and specify the scenarios in which the EN pin may be set?

Thank you for your assistance.

  • +1
    TI__Guru 53326 points

    Hi Narmatha.

    If EN is measuring > 5 V, it is most likely due to being driven or pulled up by the net and not because the EN input is actively raising its voltage and would recommend ensuring the EN is not tied to another pin that could be forcing EN above 5 V, with a path to VSUP - while verifying the below to further help clarify, thanks.

    • You may remove the 5 V feed to EN and measure EN while VSUP is present. If EN reads high, there is most likely a path from VSUP or LIN to EN.
    • Disconnect the LIN bus and any MCU pin connected to EN then measure EN with VSUP present.. If EN goes low, the external device is most likely the source of the voltage.
    • Power only the 5 V (no VSUP). If EN is correct, this confirms VSUP is most likely involved in the backdrive. Use a scope to observe for transients on EN when VSUP is applied as this can reveal if EN is being driven during power sequencing or wake events.

    Best Regards,

    Michael.

  • 0
    Prodigy 10 points

    Hello Michael,

    Thank you for your quick response.

    We have verified the below steps, the following observations are:

    * When we remove the 5V feed to EN and measure EN, it reads high

    * After disconnecting the LIN bus, if we measure EN, it reads high

    * After applying only 5V power, EN reads 5V, which is correct

    It is confirmed that VSUP is involved in the backdrive, and EN is connected in the path of VSUP. After making this change, EN reads 5V when VSUP is present

    Thank You for Your Support!