Scan sequence generator

A sensor panel device comprising:

• an event sensitive panel having a plurality of rows of sensing nodes that provide output signals indicative of an event or no-event condition on the panel;
• output circuitry operatively connected to the plurality of rows of sensing nodes that generates stimulus signals having multiple different frequencies, a first of the multiple different frequencies sequentially applied to the plurality of rows of sensing nodes to scan a frame. followed individually by a subsequent ones of the multiple different frequencies sequentially applied to the plurality of rows of sensing nodes to scan additional frames, the sensing node providing multiple outputs in response to the multiple different frequencies for at least one event to detect a position of touching of the sensor panel or nearly touching the sensor panel;
• and
• input circuitry operatively connected to the plurality of rows of sensing nodes to receive the multiple outputs, the input circuitry configured to measure the results of any stimulus signals applied to the plurality of rows of sensing nodes to determine a position of touch or near touch based on the received multiple outputs.

An apparatus for detecting events on a sensor panel device having a sensor panel surface, the sensor panel device having a plurality of drive electrodes and a plurality of sense electrodes and capacitive sensing nodes at the intersection of the drive and sense electrodes, each capacitive sensing node formed by the intersection of a single drive line and a single sense line, the apparatus comprising:

• a plurality of rows of sensors configured to detect one or more events each sensor comprising a capacitive sensing node;
• output circuitry operatively connected to the channel scan logic and the plurality of rows of sensors, the output circuitry configured to generate stimulus signals having predetermined different frequencies, and to apply the predetermined different frequencies individually and sequentially to the plurality of rows of sensor, row by row, to obtain different outputs corresponding to each frequency;
• and
• one or more analog channels operatively connected to the plurality of sensors, the one or more analog channels configured to generate distinct values representative of events occurring at distinct locations each distinct value based on the plurality of different outputs.

A method for detecting events on or about a touch sensitive surface, comprising:

• scanning an event sensor panel of event sensors organized in a plurality of rows and a plurality of columns by applying a stimulus having multiple different predetermined frequencies to one of the plurality of rows or the plurality of columns, the multiple different frequencies of the stimulus being applied individually and sequentially to the plurality of rows or the plurality of columns, the stimulus being applied to detect a touching or near touching of an object on or over the touch sensitive surface;
• during each event sensor panel scan of the plurality of rows or the plurality of columns, coupling the other of the plurality of rows or the plurality of columns of the event sensor panel to one or more analog channels to generate plural output values for the different frequencies representative of one or more events occurring at distinct locations at about the same time along the row or column being scanned;
• and
• determining a final output value based on a plurality of the plural output values.