Electronic pen generation of tilt orientation data based on capacitance difference detection

Abstract

A method includes generating, by a first drive-sense circuit of circuitry of an electronic pen, a first error signal corresponding to an electrical characteristic of a first orientation capacitor of the electronic pen; and generating, by a second drive-sense circuit of the circuitry, a second error signal corresponding to an electrical characteristic of a second orientation capacitor. The method further includes subtracting, by a first subtraction module, the first and second error signals to produce a first difference error signal; receiving, by the circuitry, a self-signal transmitted by one or more electrodes of a touch screen via a primary conductor of the electronic pen; transmitting, by the circuitry, a ring back signal to the touch screen via the primary conductor in response to the self-signal; and transmitting, by the circuitry, the first difference error signal to the touch screen via a secondary conductor of the electronic pen.