Automatic power supply selection for dual mode component

摘要

This disclosure is directed to techniques for automatically controlling a dual mode component of a device to operate according to a first mode or a second mode. According to these techniques, a device or circuit may include a first power supply input terminal and a dual mode component that includes a second power supply input terminal. The device or circuit further includes an automatic power supply selection module configured to compare a voltage level at the first power supply input terminal to a predetermined threshold, and based on the comparison, supply one of a first mode voltage level or a second mode voltage level to the second power supply input terminal. The first mode voltage level may cause the dual mode component to operate in a first mode, while the second mode voltage level may cause the dual mode component to operate in a second mode different than the first mode.

主权项

1. 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; andbased 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.