Patent ID: 9077199
Filing Date: 2015-07-07
Classification: H02J

Abstract:
1. An electronic device capable of being coupled to a first external device with a charging function, comprising a connection interface comprising a power pin and a first signal transmitting/receiving (T/R) pin set; a voltage regulation unit coupled to the power pin; a storage unit, coupled to the first T/R pin set and powered by a first operation voltage, for storing device information of the electronic device; a charging unit coupled to the power pin; a battery unit, coupled to the charging unit and charged by a charging voltage; and a processing unit, coupled to the charging unit and powered by a second operation voltage, for performing a system operation of the electronic device; wherein when the electronic device is in a power-exhaustion state and the first external device is coupled to the connection interface to provide a first supply voltage to the power pin, the voltage regulation unit transforms the first supply voltage to the first operation voltage, and the storage unit powered by the first operation voltage outputs the device information to the first external device via the first signal T/R pin set, wherein when the first external device provides a second supply voltage to the power pin in response to the device information, the electronic device enters a charging state, and wherein in the charging state, the charging unit provides the charging voltage according to the second supply voltage, and the charging unit provides the second operation voltage to the processing unit according to the second supply voltage, wherein the first signal T/R pin set of the connection interface comprises: a first positive voltage signal T/R pin coupled to the storage unit and the processing unit; a first negative voltage signal T/R pin coupled to the storage unit and the processing unit; a second positive voltage signal T/R in coupled to the processing unit; and a second negative voltage signal T/R pin coupled to the processing unit, wherein the electronic device is capable of being coupled to a second external device without the charging function, wherein when the electronic device is in a non-power-exhaustion state and booted up and the second external device is coupled to the connection interface, the electronic device performs signal communication between the processing unit and the second external device by a first transfer protocol via the first signal T/R pin set.