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TDC7200: TDC7200 limitations regarding stop pulse inside start pulse ?

aleexis sauvagee
Prodigy 10 points
Part Number: TDC7200

I have made a few test and is it normal that the stop pulse is not taking into account if it's inside the start pulse ?

If that's the case, do you have a work around ? or should I adapt my application somehow ?

yellow is stop pulse

blue is start pulse

pink is trigger

dark blue is interrupt

  • 0
    TI__Mastermind 22925 points

    Hello Aleexis,

    Thanks for posting to the sensors forum! I have tested this on my end with success in the past. Do you know what the duration is of the yellow pulse?

    It looks extremely small compared to the other pulses on the capture. We do have a minimum spec for the pulse width so I would like to make sure that its not violating this spec.

    Best,

    Isaac

  • 0 in reply to Isaac Lara
    Prodigy 10 points

    Hello Isaac,

    I believe it was in at least us (you can see the pulse width if you zoom ) which is more than the required width minimum duration (If I recall icorrectly it's around 10ns or so)

    I should mention that the yellow duration pulse is the same length

    Best regards

  • 0 in reply to aleexis sauvagee
    TI__Mastermind 22925 points

    Hello Aleexis,

    Thanks for confirming that, I am having a hard time discerning the timing of the START and STOP pulses. Would it be possible to separate the waveforms on your capture? From what it looks like to me the yellow is coming in before the blue pulse.

    I am basing this off of the trigger point. I drew the top of the yellow pulse to confirm with you if this is the case.

    Best,

    Isaac

  • 0 in reply to Isaac Lara
    Prodigy 10 points

    Hello Isaac,

    Sorry, I should have had more precisions.

    The 2 tests shared are in the following conditions,

    - first picture is with one stop pulse before the start pulse

    there are in total 2 start pulses and 3 stop

    - second picture is without stop pulse before the start pulse

    there are in total 2 start pulses and 2 stop

    If the pictures are still not clear to you, I will anotate them

    Let me know if you need anymore details

    Best regards

  • 0 in reply to aleexis sauvagee
    TI__Mastermind 22925 points

    Hello Aleexis,

    Thanks for the explanation, no need to anotate the images I understood based on your last comments provided.

    As mentioned we have been able to test before in the past with correct results. Do you mind sharing more about what you are seeing as a result from these measurements?

    It seems like based on the images the devices INTB is not going low until the second STOP pulse is provided, is your device configured to a single or two STOP pulses?

    If single STOP is used is the result provided using the first START or second START as the reference starting?

    Best,

    Isaac