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TSC2007: TSC2007 Touch Causes Display Flicker and Deserializer LOCK Drop

Conor
Guru 15090 points

Part Number: TSC2007

Hi,

We use TSC2007IPWR (resistive touch controller) on a remote LCD board. When the user touches the panel, the display flickers, and at the same timing the deserializer LOCK de-asserts momentarily (SerDes link unlock). After touch release, LOCK returns and the display becomes stable.

System overview:

  • Main board sends video data to remote LCD board via serializer → ~1850mm FFC → deserializer.

  • Remote board: deserializer output drives LCD, and TSC2007 reads the touch panel (X+/X-/Y+/Y-) via local routing; touch data is read via I²C.

  • The SerDes circuit/cable/termination is unchanged from our previous proven design; the issue appears correlated with touch operation / sampling.

Could you advise what to check to reduce interference? For example:

  • Power/grounding and decoupling recommendations for TSC2007 near high-speed SerDes

  • Any suggested filtering/series resistors on touch panel lines or I²C

  • Any known issues or recommended operation settings/timing to minimize noise impact

Best regards,
Conor