专利名称：Methods, systems and apparatus for
determining whether an accessory includesparticular circuitry
发明人：Scott Mullins,Alexei Kosut,Jeffrey J.
Terlizzi,Zachary C. Rich
申请号：US13730667申请日：20121228公开号：US08878484B2公开日：20141104
专利附图：
摘要：Methods, systems, and apparatus for determining whether an accessory
includes particular circuitry. A host device may measure a first voltage and a secondvoltage received from an accessory, where the voltages are provide through theaccessory from a power source. Before measuring the second voltage, the host devicemay send an instruction to the accessory instructing the accessory to alter an impedanceof the power path between the power source and the host device, and the host devicemay draw at least a threshold amount of current from the power source via the
accessory. The host device may then determine whether the accessory includes particularcircuitry based on the relationship between the first voltage and the second voltage.
申请人：Apple Inc.
地址：Cupertino CA US
国籍：US
代理机构：Kilpatrick Townsend & Stockton LLP
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