Pulse density modulation systems and methods

A method comprising:

• providing a programmable pulse density modulation (PDM) device, a PDM master device and a bus communicably coupling the programmable PDM device to the PDM master device;
• managing, by the PDM master device, bus communications for a plurality of operating modes including a predefined PDM operating mode and a plurality of programmable modes;
• setting an operating mode based on first programming data for programming the PDM device received from the PDM master device;
• transmitting from the PDM device to the PDM master device, audio data over a first transmission line of the bus using the set operating mode;
• transmitting from the PDM device to the PDM master device, a clock signal associated with the audio data over a second transmission line, disposed opposite the first transmission line, of the bus using the set operating mode;
• modulating the clock signal to carry second programming data for programming the PDM device over the second transmission line of the bus using the set operating mode, the second programming data being carried from the PDM device to the PDM master device;
• and
• setting an output level of the bus during a half clock cycle and maintaining the output level using a bus holder in the predefined PDM operating mode for the rest of the half clock cycle, wherein the plurality of programmable modes are configured by splitting a clock cycle of the predefined PDM operating mode into additional phases to provide bandwidth for programmable mode control signals.