Example systems and methods transfer data between a first device and a second device. Embodiments generate, using an output circuit, an analog signal based on a data signal for an application associated with the first device and the second device. Embodiments transmit the data signal over an interface between a processor of the first device and a processor of the second device by capacitively coupling the analog signal through a capacitor formed by at least one sensor electrode, of a touchscreen, of the first device and a conductor of the second device.