APPARATUS AND METHOD OF IDENTIFYING A USB OR AN MHL DEVICE

摘要

An apparatus and a method of identifying between a USB and an MHL typed devices are disclosed. One embodiment discloses an apparatus for identifying whether the Universal Serial Bus (USB) or the Mobile High-Definition Link (MHL) typed device is attached to a connector by detecting a pull-down resistor when the USB device is actually attached to the connector. A resistor-detecting module and a switch are connected in series to form a conductive path to detect if there is a pull-down resistor connected from a data pin to a voltage-reference pin of the connector when the switch is turned on. Once the device is identified, an internal data path can be established according to the device type.