Coarse scan and targeted active mode scan for touch and stylus

An apparatus comprising:

• a touch sensor panel comprising touch electrodes, the touch sensor panel including a plurality of first regions, each of the plurality of first regions including a plurality of the touch electrodes;
• and
• processing circuitry configured to:
• perform a first detection scan of the touch sensor panel, the first detection scan comprising generating a touch value representative of an amount of touch at each of the plurality of first regions;
• identify a coarse location of an object touching or proximate to the touch sensor panel, the coarse location corresponding to a second region smaller than one of the plurality of first regions;
• and
• perform a second detection scan, the second detection scan of a portion of the touch sensor panel corresponding to the second region;
• and
• identify a fine location of the object touching or proximate to the touch sensor panel.

A method comprising:

• at an electronic device with a touch sensor panel, the touch sensor panel including a plurality of first regions, each of the plurality of first regions including a plurality of the touch electrodes:
• performing a first detection scan of the touch sensor panel, the first detection scan comprising generating a touch value representative of an amount of touch at each of the plurality of first regions;
• identifying a coarse location of an object touching or proximate to the touch sensor panel, the coarse location corresponding to a second region smaller than one of the plurality of first regions;
• and
• performing a second detection scan, the second detection scan of a portion of the touch sensor panel corresponding to the second region;
• and
• identifying a fine location of the object touching or proximate to the touch sensor panel.

A non-transitory computer readable storage medium storing instructions, which when executed by one or more processors, cause the one or more processors to perform a method, the method comprising:

• at an electronic device with a touch sensor panel, the touch sensor panel including a plurality of first regions, each of the plurality of first regions including a plurality of the touch electrodes:
• performing a first detection scan of the touch sensor panel, the first detection scan comprising generating a touch value representative of an amount of touch at each of the plurality of first regions;
• identifying a coarse location of an object touching or proximate to the touch sensor panel, the coarse location corresponding to a second region smaller than one of the plurality of first regions;
• and
• performing a second detection scan, the second detection scan of a portion of the touch sensor panel corresponding to the second region;
• and
• identifying a fine location of the object touching or proximate to the touch sensor panel.