APPARATUS AND METHOD OF IDENTIFYING A USB OR AN MHL DEVICE
First Claim
1. An apparatus for identifying whether a device is a universal serial bus (USB) typed or a mobile high-definition link (MHL) typed device, wherein the device is connected to the apparatus through a connector comprising a first data pin and a voltage-reference pin, comprising:
- a first switch having a first terminal and a second terminal; and
a first resistor-detecting module having a third terminal and a fourth terminal, wherein the first resistor-detecting module and the first switch are connected in series, wherein a first conductive path is formed from a first voltage-supply node, through the first resistor-detecting module and the first switch, to the first data pin when the first switch is turned on, wherein the device is the USB typed device when a voltage level at the first data pin is less than a pre-defined voltage level and the device is the MHL typed device if the voltage level at the first data pin is not less than the pre-defined voltage level.
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Accused Products
Abstract
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.
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Citations
20 Claims
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1. An apparatus for identifying whether a device is a universal serial bus (USB) typed or a mobile high-definition link (MHL) typed device, wherein the device is connected to the apparatus through a connector comprising a first data pin and a voltage-reference pin, comprising:
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a first switch having a first terminal and a second terminal; and a first resistor-detecting module having a third terminal and a fourth terminal, wherein the first resistor-detecting module and the first switch are connected in series, wherein a first conductive path is formed from a first voltage-supply node, through the first resistor-detecting module and the first switch, to the first data pin when the first switch is turned on, wherein the device is the USB typed device when a voltage level at the first data pin is less than a pre-defined voltage level and the device is the MHL typed device if the voltage level at the first data pin is not less than the pre-defined voltage level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for identifying whether a device is a universal serial bus (USB) typed or a mobile high-definition link (MHL) typed device, wherein the device is connected to an apparatus through a connector comprising a first data pin, a voltage-supply pin, a voltage-reference pin and a control pin, comprising the steps of:
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providing a first switch; providing a first resistor-detecting module, wherein the first resistor-detecting module and the first switch are connected in series; turning on the first switch to establish a first conductive path from a first voltage-supply node, through the first resistor-detecting module and the first switch, to the first data pin; and comparing a voltage level of the first data pin to a first pre-defined voltage level when the first switch is turned on, wherein the device is the USB typed device when a voltage level at the first data pin is less than the first pre-defined voltage level and the device is the MHL typed device if the voltage level at the first data pin is not less than the first pre-defined voltage level. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification