Patent ID: 6954868

Claim:
A detection apparatus for use in a touch pad, for detecting the coordinates indicated by a user on the touch pad and the behavior of the user on the touch pad, the touch pad including an X-layer and a Y-layer, the X- and Y-layers being planar resistors, the detection apparatus having a sleep mode and an operative mode, wherein when the user touches the touch pad, the X- and Y-layers are electrically coupled at a touch point, the detection apparatus comprising: a central processor for outputting at least a coordinate control signal, at least a conversion control signal and a wake-up control signal; a coordinate detecting unit, coupled to a first terminal of the X-layer, a second terminal of the X-layer, a first terminal of the Y-layer, a second terminal of the Y-layer, and the central processor, for receiving the coordinate signal so as to determine an X-coordinate voltage and a Y-coordinate voltage, wherein the X- and Y-coordinate voltages correspond to the touch point; an analog-to-digital converting unit, coupled to the coordinate detecting unit and the central processor, for receiving the conversion control signal so as to convert the X- and Y-coordinate voltages into an X-coordinate and a Y-coordinate, and to output the X- and Y-coordinate; and a wake-up unit, coupled to the coordinate detecting unit and the central processor, wherein, as the detection apparatus is in the sleep mode, when the user touches the touch pad and the X- and Y-layers are in contact with each other, the wake-up unit outputs a wake-up signal of a first level so that the detection apparatus changes from the sleep mode to the operative mode; the central processor sends the wake-up control signal so that the wake-up signal changes to a second level.