CN204131484U - A kind of USB OTG module - Google Patents
A kind of USB OTG module Download PDFInfo
- Publication number
- CN204131484U CN204131484U CN201420657860.8U CN201420657860U CN204131484U CN 204131484 U CN204131484 U CN 204131484U CN 201420657860 U CN201420657860 U CN 201420657860U CN 204131484 U CN204131484 U CN 204131484U
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- circuit
- usb otg
- pin position
- end circuit
- otg module
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Abstract
The utility model relates to a kind of USBOTG module, and it has the ID pin position that need maintain short-circuit condition, and ID pin position is connected with the normally closed relay maintaining its short-circuit condition.The utility model adopts normally closed relay to maintain the short-circuit condition of the ID pin position of USBOTG module, and be easy to change the state of ID pin position to other resistance by the appearance of external control signal, thus the cost of USBOTG module can be reduced, and USBOTG module is in use easy to control, and limits less.
Description
Technical field
The utility model relates to a kind of for realizing the USB OTG module that usb signal connects.
Background technology
USB OTG module has an ID pin position, and defining ID pin position in USB OTG specification has following several state
– short circuit (being represented as the main frame that power supply is provided)
– open circuit (being represented as the device receiving power supply)
– 124Kohm（ACA RID-A）
– 68kohm（ACA RID-B）
– 36.5Kohm（ACA RID-C）
When designing the OTG module of convertible ID state, need switch to switch ID state, generally common difficulty is to switch to other states from short-circuit condition.
When main frame played the part of by Portable mobile device, this ID pin position needs to maintain short-circuit condition, and the power supply that existing USB OTG is typically employed in this ID pin position connection battery or other types maintains to allow transistor switch realize short-circuit condition, as shown in Figure 1, this just makes the increase of USB OTG module cost, and also can be restricted when using.
Summary of the invention
The purpose of this utility model be to provide a kind ofly to reduce costs, USB OTG module easy to use.
For achieving the above object, the technical solution adopted in the utility model is:
A kind of USB OTG module, connect for realizing signal, it has the ID pin position that need maintain short-circuit condition, and described ID pin position is connected with the normally closed relay maintaining its short-circuit condition.
Preferably, described normally closed relay is solid-state relay or electromagnetic relay.
Preferably, the load end circuit that described normally closed relay has control end circuit, is coupled with described control deenergizing, described load circuit is connected with the ID pin position of described USB OTG module, and described load end circuit is short-circuit condition when the control signal of described control end circuit without input, has during the control signal of input present open-circuit condition at described control end circuit.
Preferably, described load end circuit is connected with outer meeting resistance.
Preferably, described control end circuit is coupled with described load end circuit by photoelectricity or electromagnetic coupled circuit.
Because technique scheme is used, the utility model compared with prior art has following advantages: the utility model adopts normally closed relay to maintain the short-circuit condition of the ID pin position of USB OTG module, and be easy to change the state of ID pin position to other resistance by the appearance of external control signal, thus the cost of USB OTG module can be reduced, and USB OTG module is in use easy to control, and limits less.
Accompanying drawing explanation
Accompanying drawing 1 is the schematic diagram of existing USB OTG module.
Accompanying drawing 2 is the schematic diagram of USB OTG module of the present utility model.
Accompanying drawing 3 is the schematic diagram of the solid-state relay that USB OTG module of the present utility model adopts.
Accompanying drawing 4 is the schematic diagram of the electromagnetic relay that USB OTG module of the present utility model adopts.
Embodiment
Below in conjunction with embodiment shown in the drawings, the utility model is further described.
Embodiment one: a kind of USB OTG module, it is installed and connects for the usb signal realized between distinct device on different devices.Be described for the USB OTG module be arranged on portable apparatus, as shown in Figure 2, the connector of this USB OTG module has the ID pin position that need maintain short-circuit condition, and ID pin position is connected with the normally closed relay maintaining its short-circuit condition.As shown in accompanying drawing 3 and accompanying drawing 4, normally closed relay is solid-state relay or electromagnetic relay.Solid-state relay have control end circuit, with control load end circuit that deenergizing is coupled, realize photoelectric coupling circuit that control end circuit and load end circuit be coupled or electromagnetic coupled circuit, load circuit is connected with the ID pin position of USB OTG module, and load end circuit is connected with outer meeting resistance R3.When control end circuit is without the control signal VBUS_EXT inputted, load end circuit is short-circuit condition, and now ID pin position resistance is 0 Ω; When control end circuit has the control signal VBUS_EXT of input, load end circuit presents open-circuit condition, now ID pin position resistance depending on outer meeting resistance R3 resistance and configure.
This USB OTG module have employed normally closed relay to maintain the short-circuit condition of its ID pin position, without the need to external power supply, so cost lower, be easy to control, there is superiority.
Above-described embodiment, only for technical conceive of the present utility model and feature are described, its object is to person skilled in the art can be understood content of the present utility model and implement according to this, can not limit protection range of the present utility model with this.All equivalences done according to the utility model Spirit Essence change or modify, and all should be encompassed within protection range of the present utility model.
Claims (5)
1. a USB OTG module, connect for realizing signal, it has the ID pin position that need maintain short-circuit condition, it is characterized in that: described ID pin position is connected with the normally closed relay maintaining its short-circuit condition.
2. a kind of USB OTG module according to claim 1, is characterized in that: described normally closed relay is solid-state relay or electromagnetic relay.
3. a kind of USB OTG module according to claim 2, it is characterized in that: the load end circuit that described normally closed relay has control end circuit, is coupled with described control deenergizing, described load circuit is connected with the ID pin position of described USB OTG module, and described load end circuit is short-circuit condition when the control signal of described control end circuit without input, has during the control signal of input present open-circuit condition at described control end circuit.
4. a kind of USB OTG module according to claim 3, is characterized in that: described load end circuit is connected with outer meeting resistance.
5. a kind of USB OTG module according to claim 3 or 4, is characterized in that: described control end circuit is coupled with described load end circuit by photoelectricity or electromagnetic coupled circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420657860.8U CN204131484U (en) | 2014-11-06 | 2014-11-06 | A kind of USB OTG module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420657860.8U CN204131484U (en) | 2014-11-06 | 2014-11-06 | A kind of USB OTG module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204131484U true CN204131484U (en) | 2015-01-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420657860.8U Active CN204131484U (en) | 2014-11-06 | 2014-11-06 | A kind of USB OTG module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204131484U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104320115A (en) * | 2014-11-06 | 2015-01-28 | 贸联电子(昆山)有限公司 | USB OTG module |
-
2014
- 2014-11-06 CN CN201420657860.8U patent/CN204131484U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104320115A (en) * | 2014-11-06 | 2015-01-28 | 贸联电子(昆山)有限公司 | USB OTG module |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |