A method and apparatus for detecting touch input at a touch sensor is provided. The touch sensor comprises a plurality of row traces, a plurality of column traces and an intersection corresponding to an identified row trace of the plurality of row traces and an identified column trace of the plurality of column traces. The touch sensor also includes at least one driver for driving the plurality of column traces and at least one reader for reading the plurality of row traces. The drivers and the readers scan the identified intersection by entering into a with-floating scan state, reading a first value for the identified row trace, entering into a without-floating scan state and reading a second value for the identified row trace. The presence of a touch input is accordingly determined based on the first and second values.