CN203659000U - Multi-USB-interface-type compatible interface circuit and intelligent information terminal - Google Patents
Multi-USB-interface-type compatible interface circuit and intelligent information terminal Download PDFInfo
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- CN203659000U CN203659000U CN201320798218.7U CN201320798218U CN203659000U CN 203659000 U CN203659000 U CN 203659000U CN 201320798218 U CN201320798218 U CN 201320798218U CN 203659000 U CN203659000 U CN 203659000U
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Abstract
The utility model provides a multi-USB-interface-type compatible interface circuit and an intelligent information terminal. The multi-USB-interface-type compatible interface circuit comprises a power switch unit, a diode, a P channel field effect tube, a processor and a USB interface base. The power input end of the power switch unit is connected with the positive pole of a power source, the power output end of the power switch unit is connected with the positive pole of the diode and the grid of the P channel field effect tube, the control end of the power switch unit is connected with the processor, the negative pole of the diode is connected with the source of the P channel field effect tube and the power end of the USB interface base, the drain of the P channel field effect tube is connected with the processor, and the power switch unit is used for controlling whether the power output end outputs a voltage at the power input end under the control of the control end or not. According to the multi-USB-interface-type compatible interface circuit and the intelligent information terminal, multiple USB interfaces are compatible, and the problem that an existing USB interface circuit is single in type is solved.
Description
Technical field
The utility model relates to interface circuit and the intelligent information terminal of the multiple usb type of a kind of compatibility.
Background technology
Existing usb circuit is simple use USB_HOST, one in USB_DEVICE or USB_OTG interface, the peripheral hardware type using is like this just more single, uses especially the equipment of USB_OTG interface, uses and also will be equipped with special USB_OTG data line.
Summary of the invention
The technical problems to be solved in the utility model, is to provide interface circuit and the intelligent information terminal of the multiple usb type of a kind of compatibility.Solve the single problem of existing usb circuit type.
The utility model is achieved in that
The interface circuit of the multiple usb type of a kind of compatibility, it is characterized in that: comprise power switch unit, diode, P-channel field-effect transistor (PEFT) pipe, processor and USB interface seat, the power input of described power switch unit is connected with positive source, the power output end of described power switch unit is connected with the grid of diode cathode and P-channel field-effect transistor (PEFT) pipe, the control end of described power switch unit is connected with processor, described diode cathode is connected with the source electrode of P-channel field-effect transistor (PEFT) pipe and the power end of USB interface seat, the drain electrode of described P-channel field-effect transistor (PEFT) pipe is connected with processor, described power switch unit for controlling the whether voltage of out-put supply input end of power output end under the control of control end.
Further, described power switch unit is USB voltage switch chip.
Further, also comprise the first resistance, one end ground connection of described the first resistance, the other end of the first resistance is connected with the power output end of power switch unit.
Further, also comprise the second resistance, one end ground connection of described the second resistance, the other end of the second resistance is connected with the drain electrode of P-channel field-effect transistor (PEFT) pipe.
Further, also comprise the 3rd resistance, the drain electrode of described P-channel field-effect transistor (PEFT) pipe is specially with the second resistance other end and being connected of processor: the drain electrode of described P-channel field-effect transistor (PEFT) pipe is first connected with one end of the 3rd resistance, and the other end of the 3rd resistance is connected with the second resistance other end and processor again.
And the utility model also provides a kind of intelligent information terminal, comprise display screen and touch-screen, also comprise the interface circuit of an above-mentioned multiple usb type of compatibility, described display screen and touch-screen are connected in the processor of described interface circuit.
The utlity model has following advantage: realize at USB_HOST on a usb circuit, USB_DEVICE, the each functional interface of USB_OTG switches, also can compatiblely use generic USB data line and USB_OTG data line, utilization factor and the dirigibility of interface are greatly improved, also the quantity that has reduced circumscribed USB interface, has reduced cost.
Accompanying drawing explanation
The utility model is further described with reference to the accompanying drawings in conjunction with the embodiments.
Fig. 1 is the interface circuit figure of the utility model preferred embodiment.
Embodiment
As shown in Figure 1, the interface circuit of the multiple usb type of a kind of compatibility, comprise power switch unit 1, diode D1, P-channel field-effect transistor (PEFT) pipe Q1, processor U1 and USB interface seat J1, the power input of described power switch unit is connected with positive source, the power output end of power switch unit 1 grid anodal with diode D1 and P-channel field-effect transistor (PEFT) pipe Q1 is connected, the control end (USB_DRV) of described power switch unit is connected with processor U1, described diode D1 negative pole is connected with the source electrode of P-channel field-effect transistor (PEFT) pipe Q1 and the power end of USB interface seat J1, the drain electrode (USB_DET) of described P-channel field-effect transistor (PEFT) pipe Q1 is connected with processor U1, power switch unit for controlling the whether voltage of out-put supply input end of power output end under the control of control end.The USBID(mark end of USB interface seat J1), USBDP(signal end), USBDM(signal end) be connected with processor U1.Processor U1 can be single-chip microcomputer or other programmable processor.Power switch unit 1 can be used switching tube to realize switching controls.Preferably, power switch unit 1 enables as example take control end as high pressure for USB voltage switch chip U2().
For fear of the power output end of power switch unit 1 voltage unstable in the time not exporting, this circuit also comprises one end ground connection of the first resistance R 1, the first resistance R 1, and the other end of the first resistance R 1 is connected with the power output end of power switch unit 1.The first resistance R 1 has guaranteed that power output end voltage in the time not exporting of power switch unit 1 is 0.
The interface of some processor U1 is with upper pull down resistor, some processor does not but have, for fear of P-channel field-effect transistor (PEFT) pipe Q1 turn-off time, P-channel field-effect transistor (PEFT) pipe Q1 drain voltage unstable, this circuit also comprises the second resistance R 2, one end ground connection of the second resistance R 2, the other end of the second resistance R 2 is connected with the drain electrode of P-channel field-effect transistor (PEFT) pipe Q1.
For fear of some low pressure processor U1 too high voltages damage to processor U1 when the P-channel field-effect transistor (PEFT) pipe Q1 conducting, further, this circuit also comprises the 3rd resistance R 3, the drain electrode of described P-channel field-effect transistor (PEFT) pipe Q1 is with second resistance R 2 other ends be specially being connected of processor U1: the drain electrode of described P-channel field-effect transistor (PEFT) pipe Q1 is first connected with one end of the 3rd resistance R 3, and the other end of the 3rd resistance R 3 is connected with second resistance R 2 other ends and processor U1 again.The dividing potential drop effect of the drain electrode to P-channel field-effect transistor (PEFT) pipe Q1 by the second resistance R 2 and the 3rd resistance R 3, makes the lower voltage of USB_DET.
And the utility model also provides a kind of intelligent information terminal, comprise display screen and touch-screen, also comprise the interface circuit of an above-mentioned multiple usb type of compatibility, display screen and touch-screen are connected in the processor U1 of described interface circuit.
Below the course of work to this interface circuit and principle are elaborated.
The utility model is in using as USB_HOST interface.Processor U1 drives the control end of USB voltage switch chip U2 to become high level, power output end conducting, output 5V(is example take supply voltage as 5V).Now diode D1 conducting, the power end conducting of USB interface seat J1, output 5V, can give outside USB_DEVICE equipment power supply, then carries out USB communication.P-channel field-effect transistor (PEFT) pipe Q1 cut-off simultaneously, USB_DET is low level, notification processor U1.
In the time using as USB_DEVICE interface.Processor U1 drives the control end of USB voltage switch chip U2 to become low level, and power output end output is closed, simultaneously P-channel field-effect transistor (PEFT) pipe Q1 conducting.Now, if any external USB _ HOST equipment access, the power end of USB interface seat J1 becomes high level, and USB_DET is high level, notification processor U1.Can carry out USB communication.
In the time using as USB_OTG interface.(1) suppose that this circuit is the HOST end of USB_OTG communication.Processor U1 drives the USBID(mark end of USB interface seat J1) be low level.Processor U1 drives the control end of USB voltage switch chip U2 to become high level, power output end conducting, output 5V.Now diode D1 conducting, the power end conducting of USB interface seat J1, output 5V, the SLAVE end equipment power supply that can give USB_OTG, then carry out alternately at two ends.P-channel field-effect transistor (PEFT) pipe Q1 cut-off simultaneously, USB_DET is low level, notification processor U1.(2) be assumed to be the SLAVE end that this circuit is USB_OTG communication.Processor U1 drives the control end of USB voltage switch chip U2 to become low level, and power output end output is closed.Now, if any the HOST end equipment access of external USB _ OTG, the USBID(mark of USB interface seat J1 is held) become low level, the power end of USB interface seat J1 becomes high level.P-channel field-effect transistor (PEFT) pipe Q1 conducting, USB_DET is high level, notification processor U1 can carry out mutual.
To sum up, this circuit is realized in reciprocal process, and processor U1 can, by controlling, by above-mentioned flow process, realize USB_OTG, the switching of HOST and SLAVE end.In being used as USB_HOST and the use of USB_DEVICE interface, can use common usb data line simultaneously.In being used as the use of USB_OTG interface, can use USB_OTG data line.
Although more than described embodiment of the present utility model; but being familiar with those skilled in the art is to be understood that; our described specific embodiment is illustrative; rather than for the restriction to scope of the present utility model; those of ordinary skill in the art are in equivalent modification and the variation done according to spirit of the present utility model, all should be encompassed in the scope that claim of the present utility model protects.
Claims (6)
1. the interface circuit of the multiple usb type of compatibility, it is characterized in that: comprise power switch unit, diode, P-channel field-effect transistor (PEFT) pipe, processor and USB interface seat, the power input of described power switch unit is connected with positive source, the power output end of described power switch unit is connected with the grid of diode cathode and P-channel field-effect transistor (PEFT) pipe, the control end of described power switch unit is connected with processor, described diode cathode is connected with the source electrode of P-channel field-effect transistor (PEFT) pipe and the power end of USB interface seat, the drain electrode of described P-channel field-effect transistor (PEFT) pipe is connected with processor, described power switch unit for controlling the whether voltage of out-put supply input end of power output end under the control of control end.
2. the interface circuit of the multiple usb type of a kind of compatibility according to claim 1, is characterized in that: described power switch unit is USB voltage switch chip.
3. the interface circuit of the multiple usb type of a kind of compatibility according to claim 1, is characterized in that: also comprise the first resistance, and one end ground connection of described the first resistance, the other end of the first resistance is connected with the power output end of power switch unit.
4. the interface circuit of the multiple usb type of a kind of compatibility according to claim 1, is characterized in that: also comprise the second resistance, and one end ground connection of described the second resistance, the other end of the second resistance is connected with the drain electrode of P-channel field-effect transistor (PEFT) pipe.
5. the interface circuit of the multiple usb type of a kind of compatibility according to claim 4, it is characterized in that: also comprise the 3rd resistance, the drain electrode of described P-channel field-effect transistor (PEFT) pipe is specially with the second resistance other end and being connected of processor: the drain electrode of described P-channel field-effect transistor (PEFT) pipe is first connected with one end of the 3rd resistance, and the other end of the 3rd resistance is connected with the second resistance other end and processor again.
6. an intelligent information terminal, comprise display screen and touch-screen, it is characterized in that: also comprise the interface circuit of a multiple usb type of compatibility as described in as arbitrary in claim 1 to 5, described display screen and touch-screen are connected in the processor of described interface circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320798218.7U CN203659000U (en) | 2013-12-06 | 2013-12-06 | Multi-USB-interface-type compatible interface circuit and intelligent information terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320798218.7U CN203659000U (en) | 2013-12-06 | 2013-12-06 | Multi-USB-interface-type compatible interface circuit and intelligent information terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203659000U true CN203659000U (en) | 2014-06-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320798218.7U Withdrawn - After Issue CN203659000U (en) | 2013-12-06 | 2013-12-06 | Multi-USB-interface-type compatible interface circuit and intelligent information terminal |
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| Country | Link |
|---|---|
| CN (1) | CN203659000U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103678234A (en) * | 2013-12-06 | 2014-03-26 | 福建鑫诺通讯技术有限公司 | Interface circuit compatible with USB interfaces of various types |
| CN107733025A (en) * | 2017-10-30 | 2018-02-23 | 深圳市亿道数码技术有限公司 | Double charging circuits and its operation method compatible with DC a kind of USB |
| CN110554985A (en) * | 2019-09-26 | 2019-12-10 | 杭州凡诺电子有限公司 | I2C and USB compatible design circuit |
-
2013
- 2013-12-06 CN CN201320798218.7U patent/CN203659000U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103678234A (en) * | 2013-12-06 | 2014-03-26 | 福建鑫诺通讯技术有限公司 | Interface circuit compatible with USB interfaces of various types |
| CN103678234B (en) * | 2013-12-06 | 2016-11-02 | 福建鑫诺通讯技术有限公司 | A kind of interface circuit of the multiple usb type of compatibility |
| CN107733025A (en) * | 2017-10-30 | 2018-02-23 | 深圳市亿道数码技术有限公司 | Double charging circuits and its operation method compatible with DC a kind of USB |
| CN107733025B (en) * | 2017-10-30 | 2023-11-21 | 深圳市亿道数码技术有限公司 | USB and DC compatible double-charging circuit and operation method thereof |
| CN110554985A (en) * | 2019-09-26 | 2019-12-10 | 杭州凡诺电子有限公司 | I2C and USB compatible design circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140618 Effective date of abandoning: 20161012 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |