Supply voltage identification

A method comprising:

• providing an indication of a first supply voltage level to be furnished to a supply voltage terminal in response to receiving power from the terminal;
• and
• in response to the indication, establishing a voltage of the terminal near the first supply voltage level.

A system comprising:

• an electronic device including an external supply voltage terminal, the electronic device providing an indication of a first supply voltage level to be furnished to the terminal in response to receiving power from the terminal;
• and
• a voltage regulator to provide power to the electronic device through the terminal to cause the electronic device to provide the indication and regulate a voltage of the terminal near the first supply voltage level in response to the electronic device providing the indication.

A voltage regulator comprising:

• voltage regulation circuitry to provide an output voltage in response to a reference voltage to power an electronic device;
• and
• a circuit to set the reference voltage to a first level to cause the voltage regulation circuitry to regulate the output voltage near a predetermined output voltage level, and in response to an indication of a supply voltage level furnished by the electronic device, set the reference voltage near a second supply voltage level to cause the voltage regulation circuitry to regulate the output voltage near the supply voltage level indicated by the electronic device.