Interference avoidance in a touch sensor by adjusting scan order

An input device comprising:

• a display configured to display frames according to a vertical synchronization (Vsync) signal;
• a plurality of sensor electrodes;
• and
• a touch controller configured to:
• drive a first subset of the plurality of sensor electrodes for sensing in a plurality of sequences comprising:
• a default sequence comprising a first sensing mode and a second sensing mode, wherein the first sensing mode precedes the second sensing mode;
• a modified sequence comprising the first sensing mode and the second sensing mode, wherein the second sensing mode precedes the first sensing mode;
• monitor timing of the Vsync signal;
• determine that communication with a system component interferes with one of the first sensing mode or the second sensing mode based on the timing of the Vsync signal;
• drive the sensor electrodes in the modified sequence based on the determination that the communication with the system component interferes with one of the first sensing mode or the second sensing mode;
• and
• receive resulting signals from a second subset of the plurality of sensor electrodes.

A method for capacitive sensing, comprising:

• driving a first subset of sensor electrodes for sensing in a plurality of sequences, the plurality of sequences comprising:
• a default sequence comprising a first sensing mode and a second sensing mode, wherein the first sensing mode precedes the second sensing mode;
• a modified sequence comprising the first sensing mode and the second sensing mode, wherein the second sensing mode precedes the first sensing mode;
• monitoring timing of a vertical synchronization (Vsync) signal;
• determining that communication with a system component interferes with one of the first sensing mode or the second sensing mode based on the timing of the Vsync signal;
• driving the sensor electrodes in the modified sequence based on the determination that the communication with the system component interferes with one of the first sensing mode or the second sensing mode;
• and
• receiving resulting signals from a second subset of electrodes.