Patent ID: 7890783

Claim:
A power source comprising: a power line; a ground line; available power circuitry operatively coupled to the power line and the ground line, wherein the available power circuitry is configured to provide a first voltage on a first output and a second voltage on a second output, the first and second voltages indicating a level of power available from the power source; and a connector including a power pin coupled to the power line, a ground pin coupled to the ground line, a first digital data pin coupled to the first output of the available power circuitry, and a second digital data pin coupled to the second output of the available power circuitry, wherein when the connector is coupled to a peripheral bus connector of an electronic device: the power line is operable to provide power to a peripheral bus connector of an electronic device via the power pin, and the first and second digital data pins are operable to provide the first and second voltages to respective digital data input pins of the peripheral bus connector of the electronic device, wherein the sign of the difference between the first voltage and the second voltage indicates whether the power source is a power adapter that receives AC power or a battery pack.