CN203759698U - Universal serial bus (USB) interface compatibility circuit - Google Patents
Universal serial bus (USB) interface compatibility circuit Download PDFInfo
- Publication number
- CN203759698U CN203759698U CN201420009433.9U CN201420009433U CN203759698U CN 203759698 U CN203759698 U CN 203759698U CN 201420009433 U CN201420009433 U CN 201420009433U CN 203759698 U CN203759698 U CN 203759698U
- Authority
- CN
- China
- Prior art keywords
- pin
- switch chip
- usb interface
- power supply
- usb
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Power Sources (AREA)
Abstract
The utility model provides a universal serial bus (USB) interface compatibility circuit which comprises a first power switch chip or a second power switch chip, a power supply and a USB interface. The first power switch chip comprises an IN pin, a GND pin, an EN pin and an OUT pin and further comprises any one of a FLAG pin or an ILIM pin. The second power switch chip comprises an IN pin, a GND pin, an EN pin, a FLAG pin, an ILIM pin and an OUT pin. The IN pins are connected with the input end of the power supply, the GND pins are connected with the ground, the OUT pins are connected with the output end of the power supply, the EN pins are connected with the control signal output end of the USB interface and used for connecting or disconnecting the power supply, the FLAG pins are connected with the control signal input end of the USB interface, and the ILIM pins are connected with a resistor to ground. The resistor to ground is utilized to adjust current, a processor utilizes an internal logic circuit to process signals and assigns to select the first power switch chip or the second power switch chip to be connected with or disconnected with the power supply. Overcurrent, overheat and burning of the USB interface are effectively avoided.
Description
Technical field
The utility model relates to a kind of circuit, relates in particular to a kind of usb compatible circuit.
Background technology
USB interface is widely used in electronic product, between each electronic product, nearly all can carry out intercommunication data by the USB interface of standard, even power supply.In gateway series products, the equipment with USB interface can connect the USB flash disk, portable hard drive and other memory devices that in our daily life, use, make gateway data can with other memory device intercommunications.The modal memory device that normally file such as film, music of gateway downloads is deposited in to USB interface connection in this class application.The USB interface of gateway can also connect 3G data card, like this can be up mobile 3G network, the descending other-end equipment such as netting twine or wireless connections computer that pass through of making into.Therefore the USB interface in gateway needs to connect all kinds of memory devices and 3G Dongle in routine use.And all kinds of USB load power consumptions are differed in size, in order to protect gateway, prevent that USB load current from exceeding design standards, USB circuit is all designed with the power switch component of power supply and protects power supply.When USB load consumption stream exceedes design standards, USB power switch can cut off power supply, or Limited Current, is no more than the maximum capacity of 5V power supply chip to reach consumption stream, prevents that the 5V power supply chip of USB power supply is because superly flow through heat and burn.
On market, USB power switch is of all kinds, has the multichannel that also has of single channel to protect.For gateway product, conventional power switch is single channel, like this can flexible Application, and design is unified, reduces costs.Conventional USB power switch is encapsulated as SOT23-5, SOT23-6 and SOP-8 etc.Wherein the above two,, because encapsulation area occupied is less, cheap, facilitate PCB Placement and Routing, are widely used.And the advantage of SOP-8 is to dispel the heat and will gets well, applicable power is larger, the occasion that consumption stream is larger, and price is also relatively high.But both single uses, can not carry out suitable selection for existing situation about running into, and can not effectively protect USB interface.
Utility model content
Object to be solved in the utility model is to be to provide a kind of USB switch compatible circuit, can be according to different situations, use needed circuit, more effective protection USB interface.
For solving the problems of the technologies described above, the utility model by the following technical solutions:
A kind of USB switch compatible circuit, is characterized in that, comprises the first power switch chip or second source switch chip, power supply and USB interface;
Described the first power switch chip (100) comprises IN pin, GND pin, EN pin, OUT pin, also comprises any one among FLAG pin or ILIM pin;
Described second source switch chip (200) comprises IN pin, GND pin, EN pin, FLAG pin, ILIM pin and OUT pin;
Described USB interface comprises processor;
Described IN pin connects the input end of described power supply, described GND pin ground connection, described OUT pin connects the output terminal of described power supply, described EN pin connects the control signal output terminal of described USB interface, be used for connecting or disconnecting described power supply, described second source switch chip connects the control signal input end of described USB interface by FLAG pin, transmit a signal to the processor of described USB interface, described second source switch chip connects resistance to earth by ILIM pin, regulate electric current by resistance to earth, the other end or ILIM pin that described the first power switch chip connects described USB interface by FLAG pin connect resistance to earth.
Further improve as usb compatible circuit, described the first power switch chip is the chip that adopts SOT23-5 encapsulation.
Further improve as usb compatible circuit, described second source switch chip is the chip that adopts SOT23-6 encapsulation or TSOT23-6 encapsulation.
Further improve as usb compatible circuit, between described IN pin and described OUT pin, be connected with the encapsulation that can fill fuse, when not using described first or when second source switch, can load onto resettable fuse.
Technique effect of the present utility model is:
1 compatibility the use of conventional USB interface switch, FLAG function and adjustable current function can be used flexibly, more effectively holding circuit;
2. use conventional little encapsulation, greatly reduce cost;
3. in the time not needing accurately to control current limliting, can select not fill power switch and only fill resettable fuse, reaching cost optimization.
Brief description of the drawings
A kind of gateway usb compatible of Fig. 1 circuit theory schematic diagram.
The schematic top plan view of the AP2171 chip of Fig. 2 SOT23-5 encapsulation.
The schematic top plan view of the MP65151 chip of Fig. 3 TSOT23-6 encapsulation.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
Usb compatible circuit theory diagrams in Fig. 1, the first power switch chip 100 is for adopting the chip of SOT23-5 encapsulation, described chip be Diodes company AP2171(as shown in Figure 2), have FLAG pin there is no ISET pin.Second source switch chip 200 is for adopting the chip of TSOT23-6 encapsulation, described chip be MPS company MP65151(as shown in Figure 3), FLAG pin and ILIM pin are total, USB interface, 5V power supply.In figure, only shown and control signal input/output terminal USB0_PWRON and the USB0_PWRFLT of USB interface, one end of 5V power supply represents with VDD_5.
AP2171100 and MP65151200 are respectively by IN pin 5 ', 1 connects power supply input end, AP2171100 and MP65151200 are respectively by GND pin 2 ', 2 connect stake resistance, AP2171100 and MP65151200 are respectively by EN pin 4 ', 3 connect the USB0_PWRON of USB interface, AP2171100 and MP65151200 are respectively by FLAG pin 3 ', 4 connect the USB0_PWRFLT of USB interface, can feed back signal to USB interface control chip, AP2171100 and MP65151200 are respectively by OUT pin 1 ', 6 connect the output terminal of VDD_5, IN pin 5 ', 1 with OUT pin 1 ', 6 are connected with resistance R 1, be used for installing resettable fuse, MP65151200 is connected with and can be filled the current-limiting resistance R4 of 12.4K to 210K by ISET pin 5, pass through adjusting resistance, can realize the size that regulates electric current.In the time starting USB connection, when load current is normal, the processor transmission level signal of USB interface is opened EN pin control power switch and is opened the path from IN to OUT, is responsible for required electric current and flows into from the IN pin of power switch, flows out powering load from OUT pin.In the time that load current is excessive, FLAG pin output low level signal, by USB interface, feeds back to the processor in USB, and processor obtains signal and processes and specify AP2171100 or MP65151200 to disconnect power supply by logical circuit.
While design on PCB, the alternative front and back that is placed on PCB of AP2171100 or MP65151200, IN pin 5 ', 1, OUT pin 1 ', 6, EN pin 4 ', 3, FLAG pin 3 ', 4 just in time overlaps, can be connected by wearing a layer via hole cabling, be connected on USB interface and power supply, the separately direct ground connection of GND pin 2,5 of ILIM pins connect resistance to earth.
Above specific embodiment of the utility model be have been described in detail, but it is as example, the utility model is not restricted to specific embodiment described above.To those skilled in the art, any equivalent modifications that this practicality is carried out and alternative also all among category of the present utility model.Therefore,, not departing from equalization conversion and the amendment done under spirit and scope of the present utility model, all should be encompassed in scope of the present utility model.
Claims (4)
1. a usb compatible circuit, is characterized in that, comprises the first power switch chip (100) or second source switch chip (200), power supply and USB interface;
Described the first power switch chip (100) comprises IN pin (5 '), GND pin (2 '), EN pin (4 '), OUT pin (1 '), also comprises any one among FLAG pin or ILIM pin (3 ');
Described second source switch chip (200) comprises IN pin (1), GND pin (2), EN pin (3), FLAG pin (4), ILIM pin (5) and OUT pin (6);
Described USB interface comprises processor;
Described IN pin (5 ', 1) connect the input end of described power supply, described GND pin (2 ', 2) ground connection, described OUT pin (1 ', 6) connects the output terminal of described power supply, described EN pin (4 ', 3) connect the control signal output terminal of described USB interface, for connecting or disconnecting described power supply
Described FLAG pin (3 ', 4) connect the control signal input end of described USB interface, transmit a signal to the processor of described USB interface, described ILIM pin (5) connects resistance to earth, described the first power switch chip (100) is connected the control signal input end of described USB interface or is connected resistance to earth by ILIM pin by FLAG pin, and described processor is by internal logic circuit processing signals and indicate described the first power switch chip (100) or described second source switch chip (200) to be communicated with or disconnect described power supply.
2. usb compatible circuit as claimed in claim 1, is characterized in that, described the first power switch chip (100) is for adopting the chip of SOT23-5 encapsulation.
3. usb compatible circuit as claimed in claim 1, is characterized in that, described second source switch chip (200) is for adopting the chip of SOT23-6 encapsulation or TSOT23-6 encapsulation.
4. usb compatible circuit as claimed in claim 1, is characterized in that, described IN pin (5 ', 1) and described OUT pin (1 ', 6) between, be connected with the encapsulation that can fill fuse, when not using described first or when second source switch, can load onto resettable fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420009433.9U CN203759698U (en) | 2014-01-07 | 2014-01-07 | Universal serial bus (USB) interface compatibility circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420009433.9U CN203759698U (en) | 2014-01-07 | 2014-01-07 | Universal serial bus (USB) interface compatibility circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203759698U true CN203759698U (en) | 2014-08-06 |
Family
ID=51254947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420009433.9U Expired - Fee Related CN203759698U (en) | 2014-01-07 | 2014-01-07 | Universal serial bus (USB) interface compatibility circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203759698U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106681950A (en) * | 2017-01-11 | 2017-05-17 | 联想(北京)有限公司 | Signal transmission processing method and device |
| CN111788752A (en) * | 2020-05-25 | 2020-10-16 | 深圳市锐明技术股份有限公司 | Protection circuit, power supply system of hard disk device and vehicle-mounted device |
-
2014
- 2014-01-07 CN CN201420009433.9U patent/CN203759698U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106681950A (en) * | 2017-01-11 | 2017-05-17 | 联想(北京)有限公司 | Signal transmission processing method and device |
| CN106681950B (en) * | 2017-01-11 | 2020-03-24 | 联想(北京)有限公司 | Signal transmission processing method and device |
| CN111788752A (en) * | 2020-05-25 | 2020-10-16 | 深圳市锐明技术股份有限公司 | Protection circuit, power supply system of hard disk device and vehicle-mounted device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101281421B (en) | USB interface switching device | |
| WO2014105149A1 (en) | Low swing voltage mode driver | |
| CN102724339A (en) | UART serial port and USB interface shared circuit and mobile phone | |
| CN102339114A (en) | Charging circuit and mainboard with same | |
| CN203759698U (en) | Universal serial bus (USB) interface compatibility circuit | |
| CN106100031B (en) | A kind of charging circuit, charging method and terminal | |
| CN204391454U (en) | A kind of Campatible data-interface | |
| CN204885732U (en) | Take USB of external equipment protection circuit | |
| CN205122939U (en) | Device of transmission electric energy and data | |
| US9106032B2 (en) | Stacking connector having a RJ-45 connector stacked over a USB connector with power and ground pins | |
| CN202363900U (en) | Circuit and USB power supply management chip for preventing USB interface current reverse irrigation | |
| CN202257555U (en) | USB (Universal Serial Bus) terminal | |
| CN204697180U (en) | Chip main board and television set | |
| CN204631855U (en) | A kind of data-interface and comprise data line and the equipment of this interface | |
| CN209328016U (en) | A kind of 4 mouthfuls of USB hub devices | |
| CN106848763A (en) | A kind of USB Type C interface | |
| CN202550224U (en) | USB (universal serial bus) hub with charging function | |
| CN205247371U (en) | Download circuit of AVR singlechip ISP interface | |
| CN203800582U (en) | USB current-limiting protection switch | |
| CN205942601U (en) | Electronic equipment interface communication reduces device of consumption | |
| CN205959193U (en) | USB timesharing multiplex circuit based on USB change over switch | |
| CN204230563U (en) | USB jockey | |
| CN105739663B (en) | USB power source control circuit | |
| CN204205225U (en) | HDMI and DisplayPort modular converter | |
| CN203537019U (en) | Lithium battery charging circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140806 Termination date: 20190107 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |