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TSC2004: Deviation of Stabilization Time(tpvs) and Internal Clock

Y.Ottey
Mastermind 6145 points
Part Number: TSC2004

Dear all,

Would you mind if you ask for Stabilization time(tpvs) and Internal Clock?

Our customer would like to know about deviation of Stabilization time tpvs and Internal Clock.

Could you answer the following questions?

1. Is Stabilization time (tpvs) affected by the internal clock in TSC2004?

2. Could you tell me the deviation of Stabilization time tpvs=10ms and Internal Clock under the following situations?

  • tpvs=10ms (PV2=1,PV1=0,PV0=1)
  • Supply Votage (SNSVDD):3.3V±7％
  • Ambient Temperature：-20℃～60℃

it would be great if you could let me know your thoughts on the following the questions.

 

Best regards,

Y.Ottey

  • 0
    TI__Guru 62895 points
    Hi Y.Ottey,

    All digital activities inside the product are based on the internal clock so, yes, the stabilization time will vary with the clock frequency variations.

    We do not have access to the min/max fosc frequencies for a +3.3V supply but should assume they're roughly the same, if not better, than with a +1.6V supply which has roughly a -10%/+15% variation. You should use this as rough guidance and if you believe that the stabilization time is encroaching upon what's possible with your touch-screen then you should probably go up to the next stabilization time setting.
  • 0 in reply to Collin Wells
    Mastermind 6145 points
    Hi,Collin

    Thank you for your reply.

    I would like to ask more question.
    In the calculation of tpvs, can you calculate from the deviation of internal clock as follows?
    　10ms * 0.9
    　10ms * 1.15
    (tpvs=10ms)

    It would be great if you could let me know your thoughts on the following the questions.

    Y.Ottey
  • 0 in reply to Y.Ottey
    TI__Guru 62895 points
    Hi Y.Ottey,

    I believe this should provide a conservative estimate on the possible variation in the Tpvs timing as the internal clock varies.
  • 0 in reply to Collin Wells
    Mastermind 6145 points
    Hi, Collin.

    Thank you for your reply.
    I would like to ask more questions.

    1. What is tpvs affected other than the internal clock?
    2.If anything else is affected, how often does that affect tpvs?

    It would be great if you could let me know your thoughts on the following the questions.

    Y.Ottey
  • 0 in reply to Y.Ottey
    TI__Guru 62895 points

    Hi Y. Ottey,

    Since the tpvs timing is based on counts off the main internal clock it will be the main variable that will affect the tpvs timing.