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TSC2004: Regarding the individual differences in devices for long touch control with the TSC2004

Kyohei
Expert 1440 points
Part Number: TSC2004

Tool/software:

Hi team,

There are devices where long touch works and others where it doesn't when using the TSC2004.

Upon observing the waveform, it was found that the period of devices where long touch works is about 3ms shorter compared to those where it doesn't.

Could the relationship between the configuration parameters and the period affect the long touch operation?

Best regards,

  • 0
    TI__Mastermind 27220 points

    Hi,

    Yes, the register based controllers such as TSC2004 allow programmable touch timings, including panel voltage stabilization (or PVS) time, pre-charge (or PR) time, and sense (or SN) time.

    Please reference chapter 6 of this application note for ways to slow down the register-based touch system and avoid the extra data.

    Operation Schemes of Touch Screen Controllers

  • 0 in reply to Daveon Douglas
    Expert 1440 points

    Hi Douglas,

    Thank you for your support.

    I am currently communicating via private message, and I would like to receive comments regarding the customer's parameter values.

    Mass production is imminent, and it would be greatly appreciated if I could receive comments by the end of the 20th Japan time (within the next 24 hours).

    I apologize for the urgency, but thank you for your cooperation.

    Best regards,

    Kyohei

  • +1 in reply to Kyohei
    TI__Mastermind 27220 points

    Hi Kyohei,

    I don't have any concerns with the register configuration sent

  • 0 in reply to Daveon Douglas
    Expert 1440 points

    Hi Douglas,

    Thank you for your prompt reply. It was extremely helpful.

    The customer believes that the register settings were changed due to lot differences.

    They would like us to confirm whether the register settings have sufficient margins to accommodate future lot differences.

    I would appreciate any comments you could provide on this matter.

    Best regards,

    Kyohei

  • 0 in reply to Kyohei
    TI__Mastermind 27220 points

    Hi Kyohei,

    Guidance on potential lot difference would require reproduceable bench data of a functionality issue. However, 'long touch' is a subjective assessment of the device capabilities and is not a performance metric for releasing silicon. In parallel, the behavior the customer is seeing could be a result of the touch screen, configuration settings, or schematic optimization

    If the customer has access to multiple production lots i suggest testing the configuration settings across a few.