Patent ID: 7215042
Filing Date: 2007-05-08
Classification: G06F

Abstract:
1. An interface unit in an electronic device for connecting the electronic device and a peripheral device, the peripheral device having a plug, the interface unit comprising: a jack comprising a detection node, a transmission node and a power source node, the detection node sending a notification signal when the plug plugging into the jack; a power source for supplying power to the peripheral device; a control unit, when the control unit receiving the notification signal, the control unit determining the power requirements of the peripheral device according a potential level between the transmission node and the power source node, wherein, if there is no power requirement for the peripheral device, the control unit measures a first resistor-capacitor (RC) value in the peripheral device through the transmission node and the power source node for peripheral device type detection; and a storage unit for storing first data; wherein the control unit compares the first RC value with the first data for peripheral device type detection and couples the power source node to the power source if the peripheral device requires power.