Patent ID: 8896156

Claim:
A device, comprising: a first power supply input terminal; a dual mode component comprising a second power supply input terminal; a voltage regulator coupled to the first power supply input terminal and configured to supply a first mode power supply voltage level to the second power supply input terminal of the dual mode component of the device, wherein the first mode power supply voltage is configured to cause the dual mode component to operate in a first mode; an automatic power supply selection circuit coupled to the first power supply input terminal and configured to: compare a voltage level at the first power supply input terminal to at least one predetermined threshold; and based on the comparison, output, to the second power supply input terminal, one of the first mode power supply voltage or a second mode power supply voltage, wherein the second mode power supply voltage is a voltage at the first power supply input terminal and is configured to cause the dual mode component to operate in a second mode different than the first mode, wherein the first mode power supply voltage is less than or equal to the voltage at the first power supply input terminal.