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USB interface circuit and mobile terminal

A USB interface and circuit technology, applied in the field of universal serial bus, can solve problems such as poor contact, ID contact corrosion, and inability to identify OTG devices.

Active Publication Date: 2018-08-14
QINGDAO HISENSE MOBILE COMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the prior art has the following defects: when the OTG device is not connected, the ID contact voltage on the mobile terminal side continues to be at a high level, and when the USB interface is in contact with water, the ID contact and the GND contact of the USB interface The voltage difference (grounding point) will cause the electrolysis of water, which will cause the ID contact to be corroded, causing poor contact, and eventually resulting in the inability to identify the OTG device

Method used

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  • USB interface circuit and mobile terminal

Examples

Experimental program
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Embodiment 1

[0016] see figure 2 , is a schematic diagram of the principle of the USB interface circuit provided by an embodiment of the present invention.

[0017] The USB interface circuit of this embodiment includes a power circuit 21 , a USB interface 27 with an ID contact 22 , an isolation circuit 23 between the power circuit and the ID contact, and a trigger detection circuit 24 . The isolation circuit includes a first bias circuit 232, a second bias circuit 233, and a transistor 231. The control terminal 2311 of the transistor is electrically connected to the voltage output terminal of the first bias circuit, and the first terminal 2312 of the transistor is connected to the output terminal of the power supply circuit. Commonly electrically connected to the input terminal of the trigger detection circuit 24, the second terminal 2313 of the transistor and the voltage output terminal of the second bias circuit are commonly electrically connected to the ID contact. When the OTG device...

Embodiment 2

[0042] The difference between this embodiment and the first embodiment is that the transistor is changed from an NPN triode to an NMOS field effect transistor 331 . The control terminal 3311 of the transistor is the gate of the field effect transistor, the first terminal 3312 is the drain of the field effect transistor, and the second terminal 3313 is the source of the field effect transistor. In addition, the second bias circuit 333 is also different. Specifically, the second bias circuit includes a third power supply V3, and a fifth resistor R5 and a sixth resistor R6 connected in series between the third power supply and ground. The voltage output end of the setting circuit is the common end of the fifth resistor and the sixth resistor. In this embodiment, R5=100KΩ, R6=50KΩ, V3=V1=1.8V can be selected.

[0043] In this embodiment, R2=100KΩ and R3=150KΩ are selected, so that the output voltage of the voltage output end of the first bias circuit is 1.1V.

[0044] When the O...

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Abstract

The invention provides a USB interface circuit. The USB interface circuit comprises a power supply circuit, a USB interface, an isolating circuit and a triggering detecting circuit, wherein the USB interface is provided with an ID contact; the isolating circuit is positioned between the power supply circuit and the ID contact; the isolating circuit comprises a first biasing circuit, a second biasing circuit and a transistor; a control end of the transistor is electrically connected to a voltage output end of the first biasing circuit; a first end of the transistor and an output end of the power supply circuit are jointly electrically connected to an input end of the triggering detecting circuit; and a second end of the transistor and a voltage output end of the second biasing circuit are jointly electrically connected with the ID contact. When OTG equipment is not connected to the USB interface, the transistor works in an amplifying or stopping state so as to isolate the power supply circuit from the ID contact, and the ID contact cannot be rust; and when the OTG equipment is connected into the USB interface, the transistor works in a saturated conduction state, the triggering detecting circuit detects change of level from high to low, and thus, recognition of the OTG equipment is realized.

Description

technical field [0001] The invention relates to the technical field of Universal Serial Bus (USB, Universal Serial Bus), in particular to a USB interface circuit and a mobile terminal. Background technique [0002] Waterproof mobile phones are loved by outdoor enthusiasts because of their good waterproof performance. In previous waterproof mobile phones, the exposed interfaces (such as USB interfaces) were sealed and waterproofed with rubber plugs. In this way, the rubber plugs need to be opened before using the interfaces, which is inconvenient to operate. Therefore, the current waterproof mobile phone adopts the method of no rubber plug, that is, the interface is directly exposed. [0003] OTG (On-The-Go, plug and play) is a very practical function of the mobile phone, which allows OTG devices such as mouse, keyboard, and U disk to be directly plugged into the mobile phone for use. The mobile phone detects whether there is an OTG device connected through the ID contact i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F13/40H04M1/725H04M1/72409
CPCG06F13/4068G06F2213/0042H04M1/72409
Inventor 孙永亮王超周亚楠
Owner QINGDAO HISENSE MOBILE COMM TECH CO LTD
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