USB Battery Charging 1.2下载

1 Introduction 1.1 General This compliance plan enables test and certification of USB Portable Devices, Charge rs and Charging Ports, Micro - ACAs, Standard - ACAs and ACA - Docks to USB 2.0 specification and to Battery Charging specification revision 1.2. Charging Ports include Dedicated Charging Ports and Charging Downstream Ports as defined in the Battery Charging Sp ecification revision 1.2. A USB Charger is a device with a Dedicated Charging Port, such as a wall adapter or car power adapter. Herein, USB Chargers are referred to as Dedicated Charging Ports as functionally they are identical. Previously a USB Portable Device with a battery and charging capability simply took power from a USB port without any control. With BC 1.2, a Portable Device can get more power and the battery can be charged faster. It is important to verify that a Portable Device complies with the BC 1.2 specification while communicating with a Charging Downstream Port and identifying a Dedicated Charger, and ensuring that it continues to operate as a functional USB device . Many existing dedicated chargers have offered a USB compliant physical conn ection but lacked a USB compliance program. This led to many chargers having characteristics incompatible with USB specifications. As well, even though PC host ports go through an extensive certification process, future PCs that claim a USB compliant Charg ing Port in their feature list will be required to pass compliance checks described in this document. These checks are in addition to those required for a USB compliant Standard Downstream Port.