CN204652542U - A kind of usb expansion circuit based on MTK platform - Google Patents
A kind of usb expansion circuit based on MTK platform Download PDFInfo
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- CN204652542U CN204652542U CN201520341607.6U CN201520341607U CN204652542U CN 204652542 U CN204652542 U CN 204652542U CN 201520341607 U CN201520341607 U CN 201520341607U CN 204652542 U CN204652542 U CN 204652542U
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- usb
- circuit
- mtk platform
- interrupt signal
- port
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Abstract
The utility model discloses a kind of usb expansion circuit based on MTK platform, this usb expansion circuit comprises MTK platform, first usb circuit, secondary USB interface circuit and interrupt signal change-over circuit, described first usb circuit connects the first USB port of described MTK platform, what described secondary USB interface circuit connected described MTK platform treats Extended Capabilities Port, described interrupt signal change-over circuit receives original interrupt signal, and produce an external interrupt signal to described MTK platform, described MTK platform is under this external interrupt signal controls, to treat that expansion USB port is connected to secondary USB interface circuit, under making it be operated in OTG pattern, the utility model is on the basis of USB2.0 as communication interface, expand the USB1.1 port of MTK platform with external OTG equipment, simplify hardware designs, save design cost.
Description
Technical field
The utility model relates to a kind of usb expansion circuit, particularly relates to a kind of usb expansion circuit based on MTK platform.
Background technology
The USB2.0 interface of current MTK platform is All-in-One interface, cannot be suitable for for the application needing usb communication and OTG to work simultaneously.Such as: in vehicle-mounted product, use when USB port transmission data or power supply and can not use OTG (On-The-Go) peripheral hardware.
At present, because the USB interface of MTK platform is less, reverse image selects the camera of AV interface mostly, and analog signal decays comparatively large when long range propagation, and needs the extra circuit increasing analog signal and change to digital screen, and cost is higher.
Summary of the invention
For overcoming the deficiency that above-mentioned prior art exists, one of the utility model object is to provide a kind of usb expansion circuit based on MTK platform, and it is on the basis of USB2.0 as communication interface, expands the USB1.1 port of MTK platform with external OTG equipment, simplify hardware designs, save design cost.
For reaching above-mentioned and other object, the utility model proposes a kind of usb expansion circuit based on MTK platform, this usb expansion circuit comprises MTK platform, first usb circuit, secondary USB interface circuit and interrupt signal change-over circuit, described first usb circuit connects the first USB port of described MTK platform, what described secondary USB interface circuit connected described MTK platform treats Extended Capabilities Port, described interrupt signal change-over circuit receives original interrupt signal, and produce an external interrupt signal to described MTK platform, described MTK platform is under this external interrupt signal controls, to treat that expansion USB port is connected to secondary USB interface circuit, under making it be operated in OTG pattern.
Further, described first USB port is USB2.0 protocol port.
Further, the external OTG equipment of described secondary USB interface circuit.
Further, treat described in that Extended Capabilities Port is USB1.1 protocol port.
Further, described interrupt signal change-over circuit comprises the potential-divider network and NPN triode that are made up of resistance (R1112, R1113), sampling voltage exports the base stage of described NPN triode to from resistance (R1112) and the intermediate node of resistance (R1113), described NPN transistor emitter ground connection, collector electrode is connected to supply voltage through load resistance, and the external interrupt signal through conversion to export from the collector electrode of described NPN triode and to be connected to the respective interrupt input pin of described MTK platform.
Further, described secondary USB interface circuit comprises level shifting circuit and socket, described MTK platform treat that Extended Capabilities Port is connected to described level shifting circuit, the input port of described level shifting circuit is connected to described socket and exports peripheral hardware to, and original interrupt signal BACK is inputted by described socket and is connected to described interrupt signal change-over circuit through resistance (R1109).
Compared with prior art, a kind of usb expansion circuit based on MTK platform of the utility model, by using the USB1.1 mouth of MTK platform as the expansion interface under OTG pattern, can use it for the application of external reverse image, do not need the analog signal changing camera on mainboard, make product modular, simplify, this expansion interface can also be used as other HID equipment external simultaneously, as USB flash disk, hard disk, sound equipment, mouse etc., simplify the hardware designs of product, save design cost.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of a kind of usb expansion circuit based on MTK platform of the utility model;
Fig. 2 is the circuit diagram interrupting change-over circuit in the utility model preferred embodiment;
Fig. 3 is the circuit diagram of secondary USB interface circuit 30 in the utility model preferred embodiment.
Embodiment
Below by way of specific instantiation and accompanying drawings execution mode of the present utility model, those skilled in the art can understand other advantage of the present utility model and effect easily by content disclosed in the present specification.The utility model is also implemented by other different instantiation or is applied, and the every details in this specification also can based on different viewpoints and application, carries out various modification and change not deviating under spirit of the present utility model.
Fig. 1 is the circuit structure diagram of a kind of usb expansion circuit based on MTK platform of the utility model.As shown in Figure 1, a kind of usb expansion circuit based on MTK platform of the utility model, comprising: MTK platform 10, first usb circuit 20, secondary USB interface circuit 30 and interrupt signal change-over circuit 40.
Wherein, MTK platform 10 at least comprises two USB port, first USB port USB0 with wait to expand USB port USB1, this first USB port USB0 is the USB2.0 agreement mouth of MTK platform 10, first USB port USB0 is for connecting the first usb circuit 20, under Device and OTG pattern can be operated in, can upgrade as plateform system, or give system power supply, wait to expand the USB1.1 agreement mouth that USB port USB1 is MTK platform, it is for connecting secondary USB interface circuit 30, under being operated in OTG pattern, various Driver equipment can be identified, be used in vehicle-mounted product and do reverse image, interrupt change-over circuit 40 and receive original interrupt signal BACK, and produce an external interrupt signal EINT_BACK to MTK platform 10, under controlling at external interrupt signal EINT_BACK, to treat that expansion USB port USB1 is connected to secondary USB interface circuit 30, under making it be operated in OTG pattern, various Driver equipment can be identified, such as, in vehicle-mounted product, do reverse image.
Fig. 2 is the circuit diagram interrupting change-over circuit in the utility model preferred embodiment.As shown in Figure 2, the original interrupt signal BACK of peripheral hardware is connected to resistance R1112, the potential-divider network of R1113 composition, sampling voltage is from resistance R1112, R1113 intermediate point exports the base stage being connected to NPN triode Q1101 (SST3904), the grounded emitter of NPN triode Q1101 (SST3904), its collector electrode is connected to supply voltage through load resistance R1111, export from the collector electrode of NPN triode Q1101 (SST3904) through the interrupt signal EINT_BACK of conversion and be connected to the respective interrupt input pin of MTK platform 10, namely, in the utility model, the effect of NPN triode Q1101 makees switch to use, when outside BACK signal is drawn high, triode ON, EINT-BACK signal drags down, when outside BACK signal is low level, triode ends, EINT_BACK signal is drawn high, realize interrupt signal BACK signal and the conversion of EINT_BACK signal level
Fig. 3 is the circuit diagram of secondary USB interface circuit 30 in the utility model preferred embodiment.MTK platform 10 treat that Extended Capabilities Port USB1 (USB_DP1, USB_DN1) is connected to level shifting circuit U1101, be connected to socket J1102 from its input port (the 3-4 pin of level shifting circuit U1101) and export peripheral hardware to, in the utility model, level shifting circuit U1101 and resistance R1107/R1108 is compatible design, U1101 is the common mode inductance suppressing EMI, two 0 Ohmic resistances can be changed into, reduce costs; The original interrupt signal BACK of peripheral hardware is inputted by socket J1102 and is connected to interrupt signal change-over circuit (Fig. 2) through resistance R1109.T1102-1104 is antistatic ESD diode, is connected to original interrupt signal BACK input and level shifting circuit output (peripheral hardware input).
In sum, a kind of usb expansion circuit based on MTK platform of the utility model, by using the USB1.1 mouth of MTK platform as the expansion interface under OTG pattern, can use it for the application of external reverse image, do not need the analog signal changing camera on mainboard, make product modular, simplify, this expansion interface can also be used as other HID equipment external simultaneously, as USB flash disk, hard disk, sound equipment, mouse etc., simplify the hardware designs of product, save design cost.
Above-described embodiment is illustrative principle of the present utility model and effect thereof only, but not for limiting the utility model.Any those skilled in the art all without prejudice under spirit of the present utility model and category, can carry out modifying to above-described embodiment and change.Therefore, rights protection scope of the present utility model, should listed by claims.
Claims (6)
1. the usb expansion circuit based on MTK platform, it is characterized in that: this usb expansion circuit comprises MTK platform, first usb circuit, secondary USB interface circuit and interrupt signal change-over circuit, described first usb circuit connects the first USB port of described MTK platform, what described secondary USB interface circuit connected described MTK platform treats Extended Capabilities Port, described interrupt signal change-over circuit receives original interrupt signal, and produce an external interrupt signal to described MTK platform, described MTK platform is under this external interrupt signal controls, to treat that expansion USB port is connected to secondary USB interface circuit, under making it be operated in OTG pattern.
2. a kind of usb expansion circuit based on MTK platform as claimed in claim 1, is characterized in that: described first USB port is USB2.0 protocol port.
3. a kind of usb expansion circuit based on MTK platform as claimed in claim 1, is characterized in that: the external OTG equipment of described secondary USB interface circuit.
4. a kind of usb expansion circuit based on MTK platform as claimed in claim 1, is characterized in that: described in treat that Extended Capabilities Port is USB1.1 protocol port.
5. a kind of usb expansion circuit based on MTK platform as claimed in claim 1, it is characterized in that: described interrupt signal change-over circuit comprises by resistance (R1112, R1113) potential-divider network formed and NPN triode, sampling voltage exports the base stage of described NPN triode to from resistance (R1112) and the intermediate node of resistance (R1113), described NPN transistor emitter ground connection, collector electrode is connected to supply voltage through load resistance, external interrupt signal through conversion exports from the collector electrode of described NPN triode and is connected to the respective interrupt input pin of described MTK platform.
6. a kind of usb expansion circuit based on MTK platform as claimed in claim 1, it is characterized in that: described secondary USB interface circuit comprises level shifting circuit and socket, described MTK platform treat that Extended Capabilities Port is connected to described level shifting circuit, the input port of described level shifting circuit is connected to described socket and exports peripheral hardware to, and original interrupt signal BACK is inputted by described socket and is connected to described interrupt signal change-over circuit through resistance (R1109).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520341607.6U CN204652542U (en) | 2015-05-25 | 2015-05-25 | A kind of usb expansion circuit based on MTK platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520341607.6U CN204652542U (en) | 2015-05-25 | 2015-05-25 | A kind of usb expansion circuit based on MTK platform |
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| Publication Number | Publication Date |
|---|---|
| CN204652542U true CN204652542U (en) | 2015-09-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520341607.6U Expired - Fee Related CN204652542U (en) | 2015-05-25 | 2015-05-25 | A kind of usb expansion circuit based on MTK platform |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106372018A (en) * | 2016-11-11 | 2017-02-01 | 深圳市威尔德医疗电子有限公司 | Multifunctional interface board for ultrasonic diagnosis device |
-
2015
- 2015-05-25 CN CN201520341607.6U patent/CN204652542U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106372018A (en) * | 2016-11-11 | 2017-02-01 | 深圳市威尔德医疗电子有限公司 | Multifunctional interface board for ultrasonic diagnosis device |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150916 Termination date: 20180525 |