Charger detection and optimization prior to host control

摘要

Aspects of charger detection and optimization prior to host control are described herein. In various embodiments, a condition of whether reverse current is present on a system bus is detected. When the condition for reverse current is present, reverse current is sunk by one or more of various reverse current sink circuits. By relying upon one or more of the reverse current sink circuits, for safety, to address or mitigate the condition for reverse current, a detector may be able to identify or distinguish among several different types of charger or charging ports coupled to a system bus allowing a charger to be selected optimally. Further, an indicator of the type of charger or charging port coupled to the system bus is communicated over a single pin interface, for backwards compatibility with circuits capable of identifying between only two different types of chargers.

主权项

1. A method, comprising:
detecting, with a plurality of voltage dividers, whether a condition for reverse current is present on a system bus; when the condition for reverse current is present, sinking the reverse current; and after the sinking, identifying, with a battery charger detector and while a host processor is halted, a type of charger or charging port coupled to the system bus.