Circuits and methods for automatic power source detection

摘要

Embodiments of the present invention include circuits and methods for sensing resistance. In one embodiment the present invention includes a method comprising detecting a voltage at an input of a regulator received from a power adapter, determining a maximum current capability of the power adapter, and charging a battery coupled to an output of the regulator using said detected voltage and said maximum current as inputs to said regulator. In one embodiment, the detected voltage is used to configure a voltage used to determine if or when a voltage received from a power adapter drops below some threshold.

主权项

1. A method comprising:
detecting a voltage at an input of a regulator received from a power adapter; configuring, based on the detected voltage, a collapse voltage; determining a maximum current capability of the power adapter using the collapse voltage; and charging a battery coupled to an output of the regulator using said detected voltage and said maximum current as inputs to said regulator.