CapTIvate - How long can we put sensor panel and MSP430 part each other?

Yuji,
Yes you are correct, noise can have an impact because the long traces will act as an antenna. The length will be directly proportional to the capacitance per unit length of the traces/cables. In the datasheet we specify an ability to measure loads up to 300pF, so you can calculate the maximum distance based upon the capacitance per unit length of the medium chosen. As mentioned in the design guide there are software and hardware features to tune the response to compensate for larger amounts of parasitic capacitance associated with the interconnect (parasitic cancellation) as well as deal with any noise introduced (frequency hopping).

Hope that helps.
Chris