Mechanically sensitive power efficient stylus for an electronic device

A stylus comprising:

• a tip;
• a housing;
• and
• stylus circuitry at least partially positioned within the housing, wherein the stylus circuitry comprises:
• front tip stylus circuitry electrically coupled to the tip, the front tip stylus circuitry comprising:
• a printed circuit board (PCB) comprising non-linear circuitry;
• resistive circuitry including a force-sensitive resistor (FSR) coupled to the PCB in parallel with the non-linear circuitry;
• and
• a tilt component coupled to the PCB and the FSR configured to change a strain of the FSR in response to a change in orientation of the stylus;
• and
• wherein the front tip stylus circuitry is operative to provide a non-linear load when the stylus is stimulated by an external stimulation, and wherein the non-linear load is operative to provide a stylus electric field that is detectable by an electronic device when the tip of the stylus is positioned adjacent an input surface of the electronic device.

An electronic device comprising:

• a plurality of first electrodes;
• a plurality of second electrodes;
• stimulation and sensing circuitry configured to transmit signals on the plurality of first electrodes and sense receive signals on the plurality of second electrodes;
• and
• processing circuitry configured to:
• extract, from the sensed receive signals, data indicative of a non-linear response to the transmit signals;
• estimate a position of an accessory on a surface of the electronic device based on the extracted data;
• and
• estimate a tilt applied to the accessory in contact with the surface of the electronic device or a tilt angle of the accessory relative to the surface of the electronic device based on the extracted data.