Electronic writing apparatus with ring-back and other functionalities

1. A circuit comprising:

a function module operably coupled to:

detect stimulus of an electronic writing apparatus; and

generate functional data based on the detected stimulus;

a processing module operable to generate an outbound data signal from the functional data;

a transceive circuit coupled to a conductor of the electronic writing apparatus, wherein the transceive circuit includes:

a reference circuit operably coupled to:

generate an identifier signal having a unique waveform characteristic, wherein the unique waveform characteristic is an identifier for an aspect of the electronic writing apparatus; and

combine the outbound data signal with the identifier signal to produce a transmit reference signal;

a drive-sense circuit operably coupled to:

regulate the transmit reference signal on the conductor; and

generate an error correction signal based on the transmit reference signal and an inbound signal received via the conductor.

2. The circuit of claim 1 , wherein the function module comprises:

an orientation circuit that determines one or more of an orientation of the electronic writing apparatus corresponding to an x-direction of an x-y plane as the stimulus and an orientation of the electronic writing apparatus corresponding to a y-direction of the x-y plane as the stimulus.

3. The circuit of claim 1 , wherein the function module comprises:

a pen functionality circuit operable to generate the functional data to represent one or more of:

a line color;

a line thickness;

a pencil mode;

a pen mode;

a drawing format; and

a text format.

4. The circuit of claim 1 , wherein the function module comprises:

a z-direction pressure circuit operable to detect a pressure exerted on a tip of the electronic writing apparatus; and

generate the functional data to represent the detected pressure.

5. The circuit of claim 1 , wherein the function module comprises:

an eraser functionality circuit operable to generate the functional data to represent one or more of:

an erase line function;

an erase color function;

an erase pencil function;

an erase pen function; and

an eraser width.

6. The circuit of claim 1 , wherein the function module comprises:

a voice recognition circuit operable to receive a voice command; and

generate the functional data to represent the received voice command.

7. The circuit of claim 1 , wherein the function module comprises:

a touch circuit operable to detect a touch of a user of the electronic writing apparatus; and

determine functional data based on the touch.

8. The circuit of claim 1 , wherein the function module comprises:

a vibration circuit operable to convert a vibration into an electrical signal;

convert the electrical signal into functional data;

receive a control signal from the processing module; and

generate a vibration signal based on the control signal that causes the electronic writing apparatus to vibrate at a particular frequency.

9. The circuit of claim 1 , wherein the processing module is further operable to:

recover inbound data from the error correction signal; and

interpret the inbound data to determine a request for execution by the electronic writing apparatus; and

facilitate execution of the request.

10. The circuit of claim 1 , wherein the stimulus comprises one or more of:

a touch;

a pressure;

an orientation;

an acceleration;

a torque;

a vibration;

a voice command; and

a button selection.

11. The circuit of claim 1 , wherein the reference circuit includes one or more of:

a direct current (DC) voltage reference circuit;

a sinusoidal signal generator;

a multiplication circuit;

a summing circuit; and

a data level shift circuit.

12. The circuit of claim 1 , wherein the drive sense circuit comprises:

an operational amplifier;

a dependent current source; and

a feedback loop.