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TLC59116-Q1: TLC59116-Q1 Power on reset timing

Mike Jung
Intellectual 700 points
Part Number: TLC59116-Q1
Other Parts Discussed in Thread: TLC59116

Dear all.

is there a way to increase the power on reset time?

Our customer is looking for 1us capable automotive device.

Thanks.

  • 0
    TI__Expert 5380 points

    What is the target application? Normally power on reset time is tens of us time for most devices to get internal logic ready. If there is any special requirement, we can think about some work around solution on both hardware and software.

  • 0 in reply to Anda Zhang
    Intellectual 700 points

    Thank you for your prompt reply.

    If Vcc is unstable and Vcc fluctuates below Vpor, flicker-like phenomenon may occur on the LED.
    In this case, TLC59116 would like to check the change by adjusting the POR.
    Is there a HW/SW method to control POR timing?

    Thanks.

  • 0 in reply to Mike Jung
    TI__Expert 5380 points

    Hi Mike, 

    The POR time is a fixed parameter for such device. If users worry about the Vcc voltage, I would recommend to optimize the power supply circuit.

  • 0 in reply to Anda Zhang
    Intellectual 700 points
    Thank you for your reply.
    And I have additional questions.

    We have confirmed that this phenomenon is unstable when ESD is applied.
    That is, this phenomenon occurs from the LED contact 3 kV.
    Therefore, several efforts have been made to stabilize it, but it has not been solved yet.

    Please review the following inquiry with attached file.

    1. Power stabilization method with external circuit
    We tried stabilization by changing the cap value and diode, but the current method seems to be the best.
    Are there any additional considerations?

    2. Method by I2C communication
    I checked the flicker every 1ms for I2C communication controlling the LED. See the attached video file for the results.
    In addition, is there a way to prevent the flicker from being recognized by sending I2C communication at a high speed?
    Thanks.20190103_ CHMSL Block diagram & Question.pptx
  • 0 in reply to Mike Jung
    TI__Expert 5380 points
    What is the system performance requirement during ESD contact? No Flicker?

    I think the I2C noise is not the reason for the flicker. Potentially Vcc/RESET/REF pin noise, you may try using large cap on Vcc, use a 4.7k pull up resistor on RESET pin, put REF resistor as close to REF pin as possible and put a 1nF cap in parallel with REF resistor.
  • 0 in reply to Anda Zhang
    Intellectual 700 points

    Thank you for your reply.

    ESD must be satisfied by contact 10kV.
    The cause of Flickr is currently occurring from 3kV and the reason is file attachment.
    You have already applied everything you have told me, especially the higher the cap. value of Vcc, the greater the trnsient.

    Can you check the layout for any modifications?
    Or, I'd like to ask you if you have anything else to check.

    Thanks.

  • 0 in reply to Mike Jung
    TI__Expert 5380 points

    We are all clear that I2C is not a good choice for long distance communication, CAN/LIN is good at off board communication.

    The only way we can suggest is add the cap to do the filter cicuit.