Patent ID: 6727952
Filing Date: 2004-04-27
Classification: G03B

Abstract:
An electronic device having a common connector capable of connecting a plurality of peripheral devices commonly to the electronic device, the electronic device comprising:a data processing circuit for performing a specified function by conducting data communication with an information processing device connected to the common connector: a control circuit for controlling the operation of the data processing circuit: means for providing a predetermined potential difference between a pair of positive and negative data lines interconnecting the data processing circuit and the common connector: and a power source circuit for supplying power to the data processing circuit, the control circuit and the potential difference providing means, wherein the electronic device is settable in a sleep mode in which required power is supplied from the power source circuit to the control circuit, and the function of the data processing circuit is partly or entirely inactivated by limiting the supply of power to the data processing circuit, wherein the electronic device further comprises: a power source input terminal connectable to a power source output terminal provided on the information processing device; means for detecting the connection of the power source output terminal to the power source input terminal; and on/off means for turning on/off the power to be supplied from the power source circuit to the potential difference providing means, wherein the control circuit being is operable to hold the on/off means off during a period in which the electronic device is set in the sleep mode, while cancelling the sleep mode and turning on the on/off means upon the connection detecting means detecting the connection.