Capacitive communication channel for auxiliary devices

1. A capacitive input device comprising:

a first plurality of sensing electrodes configured to form a first capacitive coupling with a first plurality of auxiliary device electrodes of a first attached auxiliary device,

wherein the first plurality of auxiliary device electrodes transmits data signals to the first plurality of sensing electrodes via the first capacitive coupling; and

processing circuitry configured to decode the data signals received via the first capacitive coupling to obtain decoded data.

2. The capacitive input device of claim 1 , wherein:

the first plurality of sensing electrodes extends along a direction that is perpendicular to a side of the capacitive input device that is adjacent to the first attached auxiliary device.

3. The capacitive input device of claim 1 , wherein:

the first plurality of sensing electrodes extends along a direction that is parallel to a side of the capacitive input device that is adjacent to the first attached auxiliary device.

4. The capacitive input device of claim 1 , further comprising:

a second plurality of sensing electrodes different from the first plurality of sensing electrodes, the second plurality of sensing electrodes configured to form a second capacitive coupling with a second plurality of auxiliary device electrodes of a second attached auxiliary device.

5. The capacitive input device of claim 1 , further comprising:

a second plurality of sensing electrodes forming a second capacitive coupling with the first plurality of sensing electrodes; and

sensing circuitry coupled to the first plurality of sensing electrodes and the second plurality of sensing electrodes, the sensing circuitry configured to:

drive a third plurality of sensing electrodes with sensing signals,

receive resulting signals from the first plurality of sensing electrodes resulting from the sensing signals and the second capacitive coupling.

6. The capacitive input device of claim 5 , wherein the sensing circuitry is further configured to:

receive the data signals via the first capacitive coupling,

wherein the receiving of the data signals is interleaved with the driving of the third plurality of sensing electrodes and receiving the resulting signals.

7. The capacitive input device of claim 5 , wherein the capacitive input device comprises a touchscreen defining a sensing region, and wherein the processing circuitry is further configured to:

determine positional information of an input object in the sensing region from the resulting signals,

wherein the input object is distinct from the first attached auxiliary device.

8. The capacitive input device of claim 1 , wherein the capacitive input device is configured to:

transmit a beacon signal using a plurality of electrodes comprising the first plurality of sensing electrodes,

receive an auxiliary device acknowledgement for the first attached auxiliary device, and

modify a timing of driving a second plurality of sensing electrodes based on receiving the auxiliary device acknowledgement.

9. The capacitive input device of claim 8 , wherein modifying the timing comprises halting driving the second plurality of sensing electrodes in order to receive the data signals.

10. The capacitive input device of claim 8 , wherein modifying the timing comprises interleaving driving the second plurality of sensing electrodes and receiving resulting signals with receiving the data signals.

11. A system comprising a first auxiliary device comprising:

a first input element configured to receive first input from a user;

a first processing component coupled to the first input element and configured to process the first input to obtain first data; and

first port circuitry coupled to the first processing component and comprising a first plurality of auxiliary device electrodes configured to form a first capacitive coupling with a first plurality of sensing electrodes of an attached capacitive input device,

the first port circuitry configured to drive the first plurality of auxiliary device electrodes with first data signals encoding the first data.

12. The system of claim 11 , wherein the first auxiliary device is a gaming controller.

13. The system of claim 11 , further comprising:

a second auxiliary device comprising:

a second input element configured to receive second input from the user,

second processing component coupled to the second input element and configured to process the second input to obtain second data, and

second port circuitry coupled to the second processing component and comprising a second plurality of auxiliary device electrodes configured to form a second capacitive coupling with a second plurality of sensing electrodes of the attached capacitive input device,

the second port circuitry configured to drive the second plurality of auxiliary device electrodes with second data signals encoding the second data,

wherein the first plurality of sensing electrodes and second plurality of sensing electrodes are different electrodes.

14. The system of claim 11 , further comprising:

a harness for attaching the first auxiliary device and a second auxiliary device to two sides of the attached capacitive input device.

15. The system of claim 11 , wherein the first auxiliary device is a payment device.

16. A method comprising:

attaching a first auxiliary device to a capacitive input device;

receiving, by the capacitive input device, first input from a first input element of the first auxiliary device;

generating first data signals from the first input; and

transmitting first data signals via a first capacitive coupling between a first plurality of auxiliary device electrodes on the first auxiliary device and a first plurality of sensor electrodes on the capacitive input device.

17. The method of claim 16 , further comprising:

receiving a beacon signal from the capacitive input device, and

responding to the beacon signal with an auxiliary device acknowledgement.

18. The method of claim 16 , further comprising:

attaching a second auxiliary device to the capacitive input device;

receiving, by the capacitive input device, second input from a second input element of the second auxiliary device;

generating second data signals from the second input; and

transmitting second data signals via a second capacitive coupling between a second plurality of auxiliary device electrodes on the second auxiliary device and a second plurality of sensor electrodes on the capacitive input device.

19. The method of claim 18 , wherein the transmitting of the first data signals and the second data signals are performed concurrently.

20. The method of claim 16 , wherein the first auxiliary device is a gaming controller.