CY8CTMA340 Captouch controller fiddling
Some info from chipworks: http://chipworks.force.com/catalog/ProductDetails?sku=CYP-CY8CTMA340&viewState=DetailView
Some interesting info in Chinese here: http://www.go-gddq.com/html/s25/2013-05/1128993p3.htm
Including this schematic:
Another one ( http://www.touch-link.com/case/6870533111.html ):
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