CN211742107U - USB TYPE-C-based bidirectional transmission circuit and electronic equipment - Google Patents
USB TYPE-C-based bidirectional transmission circuit and electronic equipment Download PDFInfo
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- CN211742107U CN211742107U CN202021948995.1U CN202021948995U CN211742107U CN 211742107 U CN211742107 U CN 211742107U CN 202021948995 U CN202021948995 U CN 202021948995U CN 211742107 U CN211742107 U CN 211742107U
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Abstract
The utility model discloses a two-way transmission circuit and electronic equipment based on USBTYPE-C. The circuit includes: the device comprises a control module, a channel switching chip, an interface positive and negative insertion identification module, a USB TYPE-C interface, a first pull-up resistor, a second pull-up resistor, a first pull-down resistor and a second pull-down resistor, wherein a bidirectional 4-channel-to-2-channel switching circuit structure is formed by the channel switching chip to realize the switching function of AUX +, AUX-and the pull-down resistors. The utility model discloses can support the DP AUX signal bidirectional transmission of USB TYPE-C interface, circuit structure is simple, and is with low costs.
Description
Technical Field
The utility model belongs to the technical field of the data transmission circuit, more specifically relates to a two-way transmission circuit and electronic equipment based on USBTYPE-C.
Background
In recent years, the USB TYPE-C interface has gained consistent praise from manufacturers and users once the USB TYPE-C interface is released after the positive and negative pluggable functions are added and the size of the interface is reduced on the basis of the universality of the original USB interface. The USB TYPE-C interface includes two data transfer modes: USB Mode and Alternate Mode. When the Alternate Mode is used, all the two groups of TX pins and all the two groups of RX pins are used as data transmitting channels or all the two groups of TX pins and all the two groups of RX pins are used as data receiving channels to transmit DP image signals.
However, the DP image signal needs to use AUX control signal to perform information interaction and state control during the traditional DP interface transmission, the USB TYPE-C interface reserves SBU1 and SBU2 pins as extension pins of Alternate Mode, and the DP protocol also specifies that AUX control signal can only be transmitted using SBU1 and SBU2 pins during DP signal transmission using the TYPE-C interface. However, the USB TYPE-C interface is an interface supporting positive and negative insertion, and if the AUX + and AUX-corresponding to SBU1 and SBU2 are connected reversely, the positions are also exchanged. When the insertion is positive, the DP basic link can know that AUX + needs to be pulled down at the TX transmitting end and AUX-needs to be pulled up at the TX transmitting end. When reverse insertion occurs, the pull-up resistor and the pull-down resistor need to be switched between positions while AUX + and AUX-are switched between positions.
In the existing technology for transmitting DP image signals by using a USB TYPE-C interface, the problem is generally solved by a special DPAUX control chip, but the DP AUX control chip has high cost and a complex circuit structure. And at present, no DP AUX control chip supporting DP2.0 signals exists, so that the transmission of DP2.0 image signals by using a USB TYPE-C interface is limited.
SUMMERY OF THE UTILITY MODEL
To at least one defect or improvement demand of prior art, the utility model provides a two-way transmission circuit and electronic equipment based on USBTYPE-C can support the DP AUX signal two-way transmission of USB TYPE-C interface, and circuit structure is simple, and is with low costs.
To achieve the above object, according to the first aspect of the present invention, there is provided a bidirectional transmission circuit based on USB TYPE-C, including: the device comprises a control module, a channel switching chip, an interface forward and reverse insertion identification module and a USB TYPE-C interface;
the control module comprises an AUX1+ pin, an AUX 1-pin, an AUX2+ pin, an AUX 2-pin, an input end and a control end, one end of the interface recognition module interface is positively and negatively inserted into the recognition module and connected with a USB TYPE-C interface, the other end of the interface recognition module interface is positively and negatively inserted into the recognition module and connected with the input end of the control module, the first end of the channel switching chip is connected with the SBU1 pin of the USB TYPE-C interface, the second end of the channel switching chip is connected with the SBU2 pin of the USB TYPE-C interface, the third end of the channel switching chip is connected with the AUX1+ pin of the control module, the fourth end of the channel switching chip is connected with the AUX 2-pin of the control module, the fifth end of the channel switching chip is connected with the AUX 1-pin of the control module, and the sixth end of the channel switching chip is connected with an AUX2+ pin of the control module, and the seventh end of the channel switching chip is connected with the control end of the control module.
Preferably, the USB TYPE-C based bidirectional transmission circuit further includes a first pull-up resistor, a second pull-up resistor, a first pull-down resistor, and a second pull-down resistor, the AUX1+ pin of the control module is connected to a given pull-up voltage through the first pull-up resistor, the AUX 2-pin of the control module is connected to the given pull-up voltage through the second pull-up resistor, the AUX 1-pin of the control module is grounded through the first pull-down resistor, and the AUX2+ pin of the control module is grounded through the second pull-down resistor.
Preferably, the control module is an FPGA module.
Preferably, the interface forward and reverse insertion identification module is a USB PD control circuit with a DP signal transmission mode.
Preferably, the channel switching chip is a 4-to-2 channel switching chip.
Preferably, the first pull-up resistor and the second pull-up resistor have the same resistance value, and the first pull-down resistor and the second pull-down resistor have the same resistance value.
According to the utility model discloses a second aspect provides an electronic equipment, including any one of the aforesaid two-way transmission circuit based on USBTYPE-C.
Generally, compared with the prior art, the utility model, beneficial effect has: the circuit enables AUX + and AUX-corresponding to SBU1 and SBU2 of the USB TYPE-C interface to exchange pull-up resistance and pull-down resistance according to positive and negative insertion directions through a channel switching chip, can support DP AUX signal bidirectional transmission of the USB TYPE-C interface, and is simple in circuit structure and low in cost; the circuit does not need to use a special DP AUX control chip, so the transmission circuit can be used in a transmission link of DP2.0 signals without limitation; the channel switching chip is controlled by the FPGA, and the realization difficulty is low.
Drawings
FIG. 1 is a schematic diagram of a prior art USB TYPE-C interface;
fig. 2 is a schematic diagram of a DP AUX control signal bidirectional transmission circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
The utility model discloses two-way transmission circuit based on USBTYPE-C for transmit DP AUX control signal, include: the device comprises a control module, a channel switching chip, an interface positive and negative insertion identification module and a USB TYPE-C interface. The control module may specifically be an FPGA module. The interface forward and reverse insertion identification module is used for identifying the forward and reverse insertion direction of the USB TYPE-C interface, and can be a USB PD control circuit with a DP signal transmission mode or an interface forward and reverse insertion identification circuit which is developed and designed by self.
As shown in fig. 2, the control module is an FPGA module as an example. The control module comprises an AUX1+ pin, an AUX 1-pin and an AUX2+ pin, the device comprises an AUX 2-pin, an input end and a control end, wherein one end of an interface forward and reverse insertion identification module is connected with a USB TYPE-C interface, the other end of the interface forward and reverse insertion identification module is connected with the input end of a control module, the first end of a channel switching chip is connected with an SBU1 pin of a USBTYPE-C interface, the second end of the channel switching chip is connected with an SBU2 pin of the USB TYPE-C interface, the third end of the channel switching chip is connected with an AUX1+ pin of the control module, the fourth end of the channel switching chip is connected with an AUX 2-pin of the control module, the fifth end of the channel switching chip is connected with an AUX 1-pin of the control module, the sixth end of the channel switching chip is connected with an AUX2+ pin of the control module, and the seventh end of the channel switching chip is connected with the control end of the.
Preferably, the USB TYPE-C based bidirectional transmission circuit further includes a first pull-up resistor (R11), a second pull-up resistor (R12), a first pull-down resistor (R21), and a second pull-down resistor (R22), the AUX1+ pin of the control module is connected to a given pull-up voltage through the first pull-up resistor, the AUX 2-pin of the control module is connected to a given pull-up voltage through the second pull-up resistor, the AUX 1-pin of the control module is grounded through the first pull-down resistor, and the AUX2+ pin of the control module is grounded through the second pull-down resistor.
Preferably, the first pull-up resistor (R11) and the second pull-up resistor (R12) have the same resistance, and the first pull-down resistor (R21) and the second pull-down resistor (R22) have the same resistance.
The operation principle of the above DP AUX control signal bidirectional transmission circuit is specifically described below.
When the AUX signal uses a standard DP interface as a transmitting end, the AUX + needs to be connected with a pull-down resistor, and the AUX-needs to be connected with a pull-up resistor. However, in order to support the forward and reverse insertion when USB TYPE-C transmission is used, AUX + is connected to SBU1 and AUX-is connected to SBU2 when USB TYPE-C is inserted, and AUX + namely SBU1 is connected to a pull-down resistor and AUX-namely SBU2 is connected to a pull-up resistor. If USBTYPE-C is inserted reversely, AUX-becomes AUX +, AUX + becomes AUX-, and pull-up and pull-down also need to be changed accordingly. In order to transmit DP image signals by using the USBTYPE-C interface, a switch circuit structure of converting a bidirectional 4-channel into a 2-channel is formed by adopting a channel switching chip in the circuit structure, so that the functions of AUX +, AUX-and pull-up and pull-down resistor switching are realized.
By dividing 4 IO pins of the FPGA into two groups which respectively correspond to AUX1+, AUX1-, AUX2+ and AUX2-, wherein AUX1+ and AUX 2-are connected with pull-up resistors, AUX 1-and AUX2+ are connected with pull-down resistors, the two groups of AUX signals are selected by a chip which is used for converting four channels into two channels, when the interface forward and backward insertion identification module identifies that the USB TYPE-C interface is inserted in the forward direction, the FPGA controls the channel selection chip to switch to the AUX1 group of signals for data interaction, when the USB TYPE-C interface is reversely inserted, the FPGA control channel selection chip is switched to the AUX2 group of signals to carry out data interaction, the correct transmission of the AUX control signal on the USB TYPE-C interface is realized by respectively arranging two groups of AUX signals and a channel switching chip, therefore, the USB TYPE-C interface can transmit DP high-speed signals under Alternate Mode.
In addition, the channel switching chip can be in two-way communication, the IO pin of the FPGA can also be in two-way communication, and when the USB TYPE-C interface works at the receiving end, the channel switching structure can receive the AUX signal without changing.
The utility model discloses electronic equipment, including the two-way transmission circuit based on USBTYPE-C of any above-mentioned embodiment.
Preferably, the electronic device is an image signal generator.
Preferably, the electronic device is a display panel defect detecting device.
Preferably, the electronic device is an interface device for transmitting a DP signal.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A bidirectional transmission circuit based on USB TYPE-C, comprising: the device comprises a control module, a channel switching chip, an interface forward and reverse insertion identification module and a USB TYPE-C interface;
the control module comprises an AUX1+ pin, an AUX 1-pin, an AUX2+ pin, an AUX 2-pin, an input end and a control end, one end of the interface forward and backward insertion identification module is connected with a USB TYPE-C interface, the other end of the interface forward and backward insertion identification module is connected with the input end of the control module, the first end of the channel switching chip is connected with the SBU1 pin of the USB TYPE-C interface, the second end of the channel switching chip is connected with the SBU2 pin of the USB TYPE-C interface, the third end of the channel switching chip is connected with the AUX1+ pin of the control module, the fourth end of the channel switching chip is connected with the AUX 2-pin of the control module, the fifth end of the channel switching chip is connected with the AUX 1-pin of the control module, the sixth end of the channel switching chip is connected with the AUX2+ pin of the control module, and the seventh end of the channel switching chip is connected with the control end of the control module.
2. The USB TYPE-C based bidirectional transmission circuit of claim 1, further comprising a first pull-up resistor, a second pull-up resistor, a first pull-down resistor and a second pull-down resistor, wherein the AUX1+ pin of the control module is connected to a given pull-up voltage through the first pull-up resistor, the AUX 2-pin of the control module is connected to the given pull-up voltage through the second pull-up resistor, the AUX 1-pin of the control module is grounded through the first pull-down resistor, and the AUX2+ pin of the control module is grounded through the second pull-down resistor.
3. The USB TYPE-C based bidirectional transmission circuit of claim 1, wherein the control module is an FPGA module.
4. The USB TYPE-C based bidirectional transmission circuit of claim 1, wherein the interface positive and negative insertion identification module is a USB PD control circuit with DP signal transmission mode.
5. The USB TYPE-C based bidirectional transmission circuit of claim 1, wherein the channel switch chip is a 4-to-2 channel switch chip.
6. The USB TYPE-C based bidirectional transmission circuit of claim 2, wherein the first pull-up resistor and the second pull-up resistor have the same resistance value, and the first pull-down resistor and the second pull-down resistor have the same resistance value.
7. An electronic device comprising the USB TYPE-C based bidirectional transmission circuit according to any one of claims 1 to 6.
8. An electronic device as claimed in claim 7, which is an image signal generator.
9. An electronic device as claimed in claim 7, being a display panel defect detection device.
10. An electronic device as claimed in claim 7, said electronic device being an interface device for transmitting DP signals.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021948995.1U CN211742107U (en) | 2020-09-09 | 2020-09-09 | USB TYPE-C-based bidirectional transmission circuit and electronic equipment |
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| CN202021948995.1U CN211742107U (en) | 2020-09-09 | 2020-09-09 | USB TYPE-C-based bidirectional transmission circuit and electronic equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113868175A (en) * | 2021-12-06 | 2021-12-31 | 苏州浪潮智能科技有限公司 | Type-C interface control circuit and Type-C interface |
| CN114630230A (en) * | 2022-05-12 | 2022-06-14 | 荣耀终端有限公司 | Electronic equipment, pull-up circuit and method for suppressing earphone POP sound |
| CN115994109A (en) * | 2023-03-21 | 2023-04-21 | 合肥集创微电子科技有限公司 | Data transmission method based on Type-C physical interface and electronic equipment |
-
2020
- 2020-09-09 CN CN202021948995.1U patent/CN211742107U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113868175A (en) * | 2021-12-06 | 2021-12-31 | 苏州浪潮智能科技有限公司 | Type-C interface control circuit and Type-C interface |
| CN113868175B (en) * | 2021-12-06 | 2022-03-08 | 苏州浪潮智能科技有限公司 | Type-C interface control circuit and Type-C interface |
| CN114630230A (en) * | 2022-05-12 | 2022-06-14 | 荣耀终端有限公司 | Electronic equipment, pull-up circuit and method for suppressing earphone POP sound |
| CN115994109A (en) * | 2023-03-21 | 2023-04-21 | 合肥集创微电子科技有限公司 | Data transmission method based on Type-C physical interface and electronic equipment |
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