CN113868175A - Type-C interface control circuit and Type-C interface - Google Patents

Type-C interface control circuit and Type-C interface Download PDF

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Publication number
CN113868175A
CN113868175A CN202111472361.2A CN202111472361A CN113868175A CN 113868175 A CN113868175 A CN 113868175A CN 202111472361 A CN202111472361 A CN 202111472361A CN 113868175 A CN113868175 A CN 113868175A
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pin
positive
type
detection
interface
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CN113868175B (en
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赵现普
闫波
李岩
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Suzhou Inspur Intelligent Technology Co Ltd
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Suzhou Inspur Intelligent Technology Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/40—Bus structure
    • G06F13/4063—Device-to-bus coupling
    • G06F13/4068—Electrical coupling
    • G06F13/4072—Drivers or receivers
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F2213/0042—Universal serial bus [USB]

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  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)

Abstract

The invention discloses a Type-C interface control circuit and a Type-C interface, which comprise a positive and negative detection circuit and a control module, wherein the positive and negative detection circuit is connected with the Type-C interface and can detect whether a preset Type-C plug is reversely inserted or not, and a switching signal is output to the control module when the reverse insertion is detected, so that the control module exchanges signals output by a first surface pin and a second surface pin of the Type-C interface. It can be seen that also can receive first signal through the first face pin of self when predetermineeing Type-C plug in this application and inserting reversely, receive the second signal through the second face pin of self, the user need not to consider and predetermine whether Type-C plug inserts reverse alright disect insertion, can not cause the inside short circuit of Type-C interface, can also carry out normal signal transmission.

Description

Type-C interface control circuit and Type-C interface
Technical Field
The invention relates to the technical field of power electronics, in particular to a Type-C interface control circuit and a Type-C interface.
Background
In general, devices such as a server or an intelligent accelerator card need to provide interfaces of multiple types to output corresponding signals through interfaces of different types, such as a VGA (Video Graphics Array), an RJ-45 (Registered Jack 45) interface, a USB (Universal Serial Bus) interface, and a UART (Universal Asynchronous Receiver/Transmitter) debugging Serial port. However, for small devices such as a high-density blade server, an intelligent network card or an intelligent accelerator card, the external space of the device is limited, it is difficult to simultaneously place the interfaces, and the heat dissipation of the device is affected when the number of the interfaces is large, so that the normal operation of the device is affected.
Based on this, the Type-C interface with the smaller volume and the preset Type-C plug are used for converting the interface into the different signals in the prior art, and the pins of the Type-C interface are defined, so that the pins of the Type-C interface output the signals corresponding to the interface, and one-to-many signal conversion is realized. But because the structural symmetry of Type-C interface, and the signal that two positive and negative sides pin is connected is different, insert when avoiding the user to predetermine Type-C plug insert Type-C interface and invert, lead to the inside short circuit of Type-C interface to burn out, make its trouble and unable normal work, set up on Type-C interface and predetermine Type-C plug generally among the prior art and prevent slow-witted structure, or will predetermine the positive and negative two-sided design of Type-C plug for different colours, avoid inserting inversely with the suggestion user, but above-mentioned mode all need carry out extra setting to Type-C interface and the outward appearance of predetermineeing Type-C plug, and be not convenient for user's operation.
Disclosure of Invention
The invention aims to provide a Type-C interface control circuit and a Type-C interface, wherein a preset Type-C plug can receive a first signal through a first surface pin of the preset Type-C plug when the preset Type-C plug is reversely inserted, and can receive a second signal through a second surface pin of the preset Type-C plug, so that a user can directly insert the preset Type-C plug without considering whether the preset Type-C plug is reversely inserted, short circuit in the Type-C interface can not be caused, and normal signal transmission can be carried out.
In order to solve the technical problem, the invention provides a Type-C interface control circuit which is applied to a Type-C interface, wherein the Type-C interface comprises a first surface pin and a second surface pin, the first surface pin is used for outputting a first signal set by a user, and the second surface pin is used for outputting a second signal set by the user; the control circuit includes:
the positive and negative detection circuit is connected with the Type-C interface at the input end and is used for outputting a switching signal when detecting that a first surface pin of a preset Type-C plug is connected with a second surface pin of the Type-C interface and the second surface pin of the preset Type-C plug is connected with the first surface pin of the Type-C interface;
the switching signal input end is connected with the output end of the positive and negative detection circuit, the output end of the switching signal input end is connected with the control module connected with the first surface pin and the second surface pin of the Type-C interface, and the control module is used for controlling the first surface pin of the Type-C interface to output the second signal and the second surface pin to output the first signal when receiving the switching signal.
Preferably, the method further comprises the following steps:
the conventional detection circuit is connected with the Type-C interface and is used for outputting a failure signal when detecting that a conventional Type-C plug is inserted into the Type-C interface;
and the control signal input end of the control module is connected with the output end of the conventional detection circuit and is also used for controlling the first surface pin and the second surface pin of the Type-C interface to stop outputting when receiving the failure signal.
Preferably, the first surface pin of the Type-C interface includes a first conventional detection pin, the second surface pin includes a second conventional detection pin, the first conventional detection pin and the second conventional detection pin are respectively connected to a conventional detection power supply voltage through a conventional detection pull-up resistor, and are respectively used for being grounded through a conventional detection pull-down resistor when connected to the pin of the conventional Type-C plug, so as to output a conventional detection preset voltage, otherwise, the conventional detection power supply voltage is output;
the conventional detection circuit comprises a first conventional detection comparator C1, a second conventional detection comparator C2 and a conventional detection AND gate CA;
the positive input end of the first conventional detection comparator C1 is connected with the first conventional detection pin, and the negative input end is connected with a conventional detection comparison voltage;
the positive input terminal of the second conventional detection comparator C2 is connected to the second conventional detection pin, and the negative input terminal is connected to the conventional detection comparison voltage;
a first input end of the conventional detection and gate CA is connected to an output end of the first conventional detection comparator C1, a second input end of the conventional detection and gate CA is connected to an output end of the second conventional detection comparator C2, and an output end of the conventional detection and gate CA is connected to a control signal input end of the control module, and is configured to output the fail signal when the first conventional detection comparator C1 and/or the second conventional detection comparator C2 output a low level;
the conventional detection preset voltage is less than the conventional detection comparison voltage is less than the conventional detection power supply voltage.
Preferably, the first conventional snoop pin and the second conventional snoop pin are centrosymmetric on the Type-C interface;
the preset Type-C plug comprises a first pin and a second pin, wherein the first pin is correspondingly connected with the first conventional detection pin, the second pin is correspondingly connected with the second conventional detection pin, and the first pin and the second pin are centrosymmetric and are suspended.
Preferably, the first surface pin and/or the second surface pin of the Type-C interface include a positive and negative detection pin, the positive and negative detection pin is connected to a positive and negative detection power supply voltage through a positive and negative detection pull-up resistor, and is used for outputting the positive and negative detection power supply voltage when the preset Type-C plug is not inserted, the first surface pin of the preset Type-C plug is connected to the second surface pin of the Type-C interface, and the second surface pin of the preset Type-C plug is grounded when the second surface pin of the preset Type-C plug is connected to the first surface pin of the Type-C interface;
the positive and negative detection circuit comprises a first positive and negative detection comparator Z1, a second positive and negative detection comparator Z2 and a positive and negative detection AND gate ZA;
the negative input terminal of the first positive and negative detection comparator Z1 is connected with the positive and negative detection pin, and the positive input terminal is connected with the maximum positive and negative detection comparison voltage;
the positive input terminal of the second positive and negative detection comparator Z2 is connected with the positive and negative detection pin, and the negative input terminal is connected with the minimum positive and negative detection comparison voltage;
a first input end of the positive and negative detection and gate ZA is connected to an output end of the first positive and negative detection comparator Z1, a second input end of the positive and negative detection and gate ZA is connected to an output end of the second positive and negative detection comparator Z2, and an output end of the positive and negative detection and gate ZA is connected to a positive and negative signal input end of the control module, and is configured to output a low level when the first positive and negative detection comparator Z1 and/or the second positive and negative detection comparator Z2 outputs a low level;
the control circuit further includes:
the first input end of the first positive and negative detection comparator Z1 is connected with the output end of the first positive and negative detection comparator Z1, the second input end of the first positive and negative detection comparator Z1 is connected with the output end of the conventional detection AND gate CA, and the output end of the first positive and negative detection comparator Z1 is connected with the control signal input end of the control module;
the control module is specifically configured to control a first surface pin of the Type-C interface to output the second signal and a second surface pin to output the first signal when receiving the enable signal and receiving the low level output by the positive and negative detection and gate ZA; controlling the first surface pin and the second surface pin of the Type-C interface to stop outputting when the enabling signal is not received;
the minimum positive and negative detection comparison voltage is less than the maximum positive and negative detection comparison voltage is less than the positive and negative detection power supply voltage.
Preferably, the first surface pin of the Type-C interface includes a first positive and negative detection pin and a second positive and negative detection pin, the first positive and negative detection pin is connected to the negative input terminal of the first positive and negative detection comparator Z1 and the positive input terminal of the second positive and negative detection comparator Z2, and the second positive and negative detection pin is grounded through a positive and negative detection pull-down resistor;
the first surface pins of the preset Type-C plug comprise a third pin correspondingly connected with the first positive and negative detection pin, a fourth pin correspondingly connected with the second positive and negative detection pin, a fifth pin centrosymmetric with the third pin and a sixth pin centrosymmetric with the fourth pin;
the third pin is connected with the fourth pin; the fifth pin and the sixth pin are connected and grounded.
Preferably, the first positive and negative detection pin is specifically configured to output the positive and negative detection power supply voltage when the preset Type-C plug is not plugged in; connecting a first surface pin of the preset Type-C plug with a second surface pin of the Type-C interface, and grounding when the second surface pin of the preset Type-C plug is connected with the first surface pin of the Type-C interface; when a first surface pin of the preset Type-C plug is connected with a first surface pin of the Type-C interface, and a second surface pin of the preset Type-C plug is connected with a second surface pin of the Type-C interface, outputting a positive and negative detection preset voltage based on the resistance values of the positive and negative detection pull-up resistor and the positive and negative detection pull-down resistor;
the control module is further configured to control a first surface pin of the Type-C interface to output the first signal and a second surface pin to output the second signal when receiving the enable signal and receiving the high level output by the positive and negative detection and gate ZA;
the minimum positive and negative detection comparison voltage is less than the positive and negative detection preset voltage is less than the maximum positive and negative detection comparison voltage is less than the positive and negative detection power supply voltage.
Preferably, the first positive and negative detection pin and the second positive and negative detection pin are axisymmetric.
Preferably, the first plane pin of the Type-C interface includes a first power supply pin, and the second plane pin includes a second power supply pin;
the control circuit further includes:
the power supply control module is used for controlling the first power supply pin and the second power supply pin to output the power supply voltage when receiving the enabling signal.
In order to solve the technical problem, the invention provides a Type-C interface, which comprises the Type-C interface control circuit.
The application provides a Type-C interface control circuit and Type-C interface, including positive and negative detection circuit and control module, wherein, positive and negative detection circuit through with Type-C interface connection, can listen to and predetermine whether Type-C plug inserts reversely to detect and insert reverse time to control module output switching signal, so that control module exchanges the signal of the first face pin and the second face pin output of Type-C interface. It can be seen that also can receive first signal through the first face pin of self when predetermineeing Type-C plug in this application and inserting reversely, receive the second signal through the second face pin of self, the user need not to consider and predetermine whether Type-C plug inserts reverse alright disect insertion, can not cause the inside short circuit of Type-C interface, can also carry out normal signal transmission.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a Type-C interface control circuit according to the present invention;
FIG. 2 is a schematic diagram of pin signals of a Type-C interface in the prior art;
FIG. 3 is a signal diagram of each pin of a custom Type-C interface according to the present invention;
FIG. 4 is a schematic structural diagram of a Type-C interface control circuit according to the present invention;
fig. 5 is a schematic structural diagram of a conventional detection circuit according to the present invention;
FIG. 6 is a signal diagram of each pin of another custom Type-C interface provided by the present invention;
fig. 7 is a schematic structural diagram of a positive and negative detection circuit according to the present invention.
Detailed Description
The core of the invention is to provide a Type-C interface control circuit and a Type-C interface, wherein when a preset Type-C plug is reversely inserted, a first signal can be received through a first surface pin of the preset Type-C plug, and a second signal can be received through a second surface pin of the preset Type-C plug.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a Type-C interface control circuit according to an embodiment of the present invention, where the control circuit is applied to a Type-C interface, the Type-C interface includes a first surface pin and a second surface pin, the first surface pin is used for outputting a first signal set by a user, and the second surface pin is used for outputting a second signal set by the user; the control circuit includes:
the positive and negative detection circuit 1 is connected with the Type-C interface at the input end and is used for outputting a switching signal when detecting that a first surface pin of a preset Type-C plug is connected with a second surface pin of the Type-C interface and a second surface pin of the preset Type-C plug is connected with the first surface pin of the Type-C interface;
the switching signal input end is connected with the output end of the positive and negative detection circuit 1, and the control module 2, the output end of which is connected with the first surface pin and the second surface pin of the Type-C interface, is used for controlling the first surface pin of the Type-C interface to output a second signal and the second surface pin to output a first signal when receiving the switching signal.
The applicant considers that a plurality of interfaces, such as VGA interfaces, RJ-45 interfaces, USB interfaces, UART debugging serial ports and other various interfaces, are generally required to be arranged on devices such as a server. However, for a device with a small volume, the device itself has a limited space, it is difficult to simultaneously swing down the interfaces, and the heat dissipation is affected by the placement of more interfaces.
And the USB interface includes the interface of three kinds of different outward appearances, Type-A, Type-B and Type-C promptly, and wherein, Type-C has the volume that all far away than Type-A and Type-B is much less, is newest USB interface appearance standard. The Type-C interface has two sides interface, be first face and second face respectively, first face and the total 24 pins of second face, but the size of Type-C interface only 8.3mm x 2.5mm, the signal of the first side pin of traditional Type-C interface is the same with the signal of second side pin, please refer to FIG. 2, FIG. 2 is the pin signal schematic diagram of Type-C interface among the prior art, all support on structure and the electrical characteristic to rotate 180 and insert, support positive and negative to insert promptly, have obtained wide application on consumer electronics products such as PC, flat board and cell-phone.
Based on the above description, in the prior art, the Type-C interface, which is set to "small volume and many pins" outputs a plurality of different signals to the outside, so that the signals are selected, that is, the pins of the first side and the second side of the Type-C interface are set for each Pin, so that the Type-C interface is set on the server, and the setting of the plurality of interfaces is realized through the patch cord, one end of which is a Type-C plug, and the other end of which is a VGA interface, an RJ-45 interface, a USB interface, a UART debugging serial port and other interfaces.
However, since the Type-C interface supports positive and negative insertion, and when defining each pin of the Type-C interface, signals transmitted by the first pin and the second pin are different, please refer to fig. 3, which is a signal diagram of each pin of the self-defined Type-C interface provided by the present invention. Correspondingly, the first surface pin and the second surface pin of the preset Type-C plug are also set to be respectively in one-to-one correspondence with the pins of the Type-C interface, so that the situation of reverse insertion can exist when the preset Type-C plug is inserted into the Type-C interface by a user. If predetermine Type-C plug when inserting the Type-C interface under normal conditions, should be for the first face pin of predetermineeing Type-C plug and the first face pin of Type-C interface is connected, the second face pin of predetermineeing Type-C plug and the second face pin of Type-C interface are connected, when the user inserts reversely, also if its first face pin of predetermineeing Type-C plug after inserting and the second face pin of Type-C interface are connected, the second face pin of predetermineeing Type-C plug and the first face pin of Type-C interface are connected, not only unable normal transmission data, still can lead to Type-C interface internal circuit short circuit and make the internal circuit trouble. In order to avoid the above-mentioned result, in the prior art, a fool-proof structure is usually arranged on the first surface of the Type-C interface and the preset Type-C plug, and only when the first surface of the Type-C interface and the first surface of the preset Type-C plug face each other, the preset Type-C plug can be inserted into the Type-C interface to avoid reverse insertion; or the first surface of the Type-C interface and the first surface of the preset Type-C plug are set to be the same color, the second surface of the Type-C interface and the second surface of the preset Type-C plug are set to be the same color, and the colors of the first surface and the second surface are different, so that the user is prompted when the preset Type-C plug is inserted.
However, the above methods are all to prompt the user to avoid the user from inserting the plug reversely, and the user needs to judge whether the plug is reversely inserted according to the prompt and then insert the preset Type-C plug, which is inconvenient for the user to operate.
In order to solve the above technical problem, in the present application, a positive and negative detection circuit 1 and a control circuit are provided in a control circuit of a Type-C interface, wherein the positive and negative detection circuit 1 can detect whether a first pin of a preset Type-C plug is connected to the first pin of the Type-C interface when the preset Type-C plug is inserted, a second pin of the preset Type-C plug is connected to the second pin of the Type-C interface, if not, the first pin of the preset Type-C plug is connected to the second pin of the Type-C interface, the second pin of the preset Type-C plug is connected to the first pin of the Type-C interface, a switching signal is output to the control module 2, the control module 2 switches the first pin and the second pin of the Type-C interface, make the first face pin output second signal of Type-C interface to make the second face pin output first signal of Type-C interface, even if the user inserts when will predetermineeing Type-C plug and reverses, the Type-C interface still can be according to the corresponding signal of the direction of insertion output of predetermineeing Type-C plug based on this. Therefore, when the user inserts the preset Type-C plug into the Type-C interface, the user does not need to consider whether to insert reversely, normal signals can be received, and the Type-C interface cannot be damaged by short circuit due to reverse insertion.
It should be noted that, because the first surface of the Type-C interface is provided with 12 pins, the second surface is also provided with 12 pins, the 12 pins of the first surface output the same or different signals respectively, and the 12 pins of the second surface output the same or different signals respectively, please refer to fig. 3, all the signals output by the pins of the first surface are integrated into a first signal, and all the signals output by the pins of the second surface are combined into a second signal. It can be seen that, in fig. 3, the first surface pins of the Type-C interface are respectively labeled as a1 to a12, and the second surface pins are respectively labeled as B1 to B12, when the hardware is set, the pin a1 and the pin B12 are axisymmetric, and the pin B1 and the pin a12 are axisymmetric, when the control module 2 switches the signals transmitted by the first surface pin and the second surface pin, specifically, the signals output by a1 and B1 are switched with each other, the signals output by a2 and B2 are switched with each other, and so on.
It should be further noted that, in this application, each pin of the Type-C interface is reversely inserted into the preset Type-C plug, but each pin is not output when the control module 2 does not receive the switching signal, and if the switching signal is not received after the preset Type-C plug is inserted, each pin can be directly controlled to normally output.
In conclusion, the preset Type-C plug in the application can receive the first signal through the first surface pin of the plug when the plug is reversely inserted, and receive the second signal through the second surface pin of the plug, so that the user does not need to consider whether the preset Type-C plug is reversely inserted or not so as to be directly inserted, the internal short circuit of the Type-C interface cannot be caused, and normal signal transmission can be carried out.
On the basis of the above-described embodiment:
referring to fig. 4, fig. 4 is a specific structural schematic diagram of a Type-C interface control circuit according to the present invention.
As a preferred embodiment, the method further comprises the following steps:
the conventional detection circuit 3 is connected with the Type-C interface and is used for outputting a failure signal when detecting that a conventional Type-C plug is inserted into the Type-C interface;
the control signal input end of the control module 2 is connected with the output end of the conventional detection circuit 3, and is further used for controlling the first surface pin and the second surface pin of the Type-C interface to stop outputting when receiving the failure signal.
The applicant considers that each pin of the Type-C interface in the present application outputs a corresponding signal for the user according to the setting of the user, and the user may mistakenly insert a conventional Type-C plug into the Type-C interface set in the present application under some circumstances, and may also cause an internal short circuit of the Type-C interface while failing to normally transmit data.
In order to solve the technical problem, a conventional detection circuit 3 is further arranged in the application, the conventional detection circuit 3 can detect whether the inserted Type-C plug is a conventional Type-C plug, and if the inserted Type-C plug is the conventional Type-C plug, each pin is controlled not to be output, so that the fault of the Type-C interface is avoided.
It should be noted that an alarm module can be further arranged, and if the control module 2 receives a failure signal, the alarm module can be started to alarm, so that a user can pull out a conventional Type-C plug.
As a preferred embodiment, the first surface pin of the Type-C interface includes a first conventional detection pin, the second surface pin includes a second conventional detection pin, the first conventional detection pin and the second conventional detection pin are respectively connected to the conventional detection power supply voltage through a conventional detection pull-up resistor Rp, and are respectively used for being grounded through a conventional detection pull-down resistor when connected to the pin of the conventional Type-C plug, so as to output a conventional detection preset voltage, otherwise, the conventional detection power supply voltage is output;
the normal detection circuit 3 comprises a first normal detection comparator C1, a second normal detection comparator C2 and a normal detection and gate CA;
the positive input end of the first conventional detection comparator C1 is connected with the first conventional detection pin, and the negative input end is connected with the conventional detection comparison voltage;
the positive input end of the second conventional detection comparator C2 is connected with the second conventional detection pin, and the negative input end is connected with the conventional detection comparison voltage;
a first input end of the conventional detection and gate CA is connected to an output end of the first conventional detection comparator C1, a second input end thereof is connected to an output end of the second conventional detection comparator C2, and an output end thereof is connected to a control signal input end of the control module 2, and is configured to output a fail signal when the first conventional detection comparator C1 and/or the second conventional detection comparator C2 output a low level;
the conventional detection preset voltage is less than the conventional detection comparison voltage is less than the conventional detection power supply voltage.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a conventional detection circuit according to the present invention.
Set up the conventionality respectively at the first face and the second face of Type-C interface in this application and listen the pin, because A5 pin and B5 pin on the conventionality Type-C plug listen pull-down resistance ground connection through the conventionality respectively, consequently, can set up the A5 pin of Type-C interface into first conventionality and listen the pin, B5 pin sets up to the second conventionality and listens the pin.
When the conventional Type-C plug is not inserted, the level of the first conventional detecting pin and the level of the second conventional detecting pin are both pulled high by the conventional detecting pull-up resistor Rp, when the conventional Type-C plug is inserted, the level of the first conventional detecting pin and the level of the second conventional detecting pin are pulled low, and the conventional detecting circuit 3 detects whether the conventional Type-C plug is inserted or not by detecting the level of the first conventional detecting pin and the level of the second conventional detecting pin.
Specifically, the conventional detection circuit 3 is provided with a first conventional detection comparator C1 and a second conventional detection comparator C2, since the positive input terminal of the first conventional detection comparator C1 is connected to the first conventional detection pin, the negative input terminal of the first conventional detection comparator C1 is connected to the conventional detection comparison voltage, the positive input terminal of the second conventional detection comparator C2 is connected to the second conventional detection pin, the negative input terminal of the second conventional detection comparator C2 is connected to the conventional detection comparison voltage, and the conventional detection preset voltage < the conventional detection comparison voltage < the conventional detection supply voltage, when the conventional Type-C plug is inserted, the first conventional detection comparator C1 outputs the conventional detection preset voltage no matter whether the conventional Type-C plug is inserted or inserted backwards, and at this time, the first conventional detection comparator C1 outputs a low level because the voltage of the positive input terminal is smaller than the voltage of the negative input terminal, the second conventional detection comparator C2 also outputs a low level because the voltage of the input positive terminal is less than the voltage of the input negative terminal; when the conventional Type-C plug is not plugged in, the first conventional detection pin and the second conventional detection pin both output the conventional detection power voltage, at this time, the first conventional detection comparator C1 outputs a high level due to the voltage of the input positive terminal being greater than the voltage of the input negative terminal, and the second conventional detection comparator C2 also outputs a high level due to the voltage of the input positive terminal being greater than the voltage of the input negative terminal.
Through the normal detection and gate CA disposed at the output terminals of the first normal detection comparator C1 and the second normal detection comparator C2, a low level, that is, a fail signal, can be output when any one of the first normal detection comparator C1 and the second normal detection comparator C2 outputs a low level, so that the control module 2 controls each pin to stop outputting.
It should be noted that the conventional detection comparison voltage in the present application may be, but is not limited to, 0.9 times the conventional detection power voltage.
Please refer to table 1 for the level of the input and output terminals of the conventional detection circuit 3
TABLE 1 level conditions at the input and output of a conventional detection circuit
Input D Input E Output F
VDD VDD Height of
Rd*VDD/(Rp+Rd) VDD Is low in
VDD Rd*VDD/(Rp+Rd) Is low in
Rd*VDD/(Rp+Rd) Rd*VDD/(Rp+Rd) Is low in
The conventional detection preset voltage can be set to Rd × VDD/(Rp + Rd) according to the resistance values of the conventional detection pull-up resistor Rp and the conventional detection pull-down resistor Rp.
In addition, the conventional detection power voltage and the positive and negative detection power voltage in the present application are both VDD, which is not limited in the present application.
In a preferred embodiment, the first conventional probing pin and the second conventional probing pin are symmetric with respect to the center of the Type-C interface;
the preset Type-C plug comprises a first pin correspondingly connected with the first conventional detection pin and a second pin correspondingly connected with the second conventional detection pin, and the first pin and the second pin are centrosymmetric and suspended.
When pin and the setting of second conventional detection pin in this embodiment are listened to first conventional detection pin and second, because the Type-C interface is two-sided symmetrical structure, in order to guarantee that no matter conventional Type-C plug is just inserting or is inserting the plug of the homoenergetic recognition conventional Type-C plug, pin and the central symmetry on the Type-C interface are listened to first conventional detection pin and second conventional detection pin in this application, and predetermine in the Type-C plug and first conventional detection pin and the second conventional first pin and the second pin of listening the corresponding setting of pin unsettled, with guarantee that when predetermineeing Type-C plug and insert that first conventional detection pin and second conventional detection pin can normally output the conventional mains voltage of listening.
It can be easily seen from fig. 4 that, pin a5 in the first surface pin in Type-C is set as the first conventional detection pin, pin B5 in the second surface pin is set as the second conventional detection pin, pin a5 and pin B5 are respectively connected to the conventional detection power supply voltage through the conventional detection pull-up resistor Rp, the plug in fig. 4 is a preset Type-C plug, the corresponding first pin a5 and second pin B5 are suspended, and when the preset Type-C plug is inserted, the pins a5 and B5 of the Type-C interface are both the conventional detection power supply voltage.
Referring to fig. 6, fig. 6 is a signal diagram illustrating each pin of another custom Type-C interface provided by the present invention.
In fig. 6, the first conventional detection pin in Type-C, that is, the signal of a5 is CC1, and the second conventional detection pin, that is, the signal of B5 is CC2, as can be seen from fig. 2, the signal of a5 pin of the conventional Type-C plug is CC1, and the signal of B5 pin is CC2, and the a5 pin and the B5 pin in this application are set to the same definition as that of the conventional Type-C interface, so as to ensure that the insertion of the conventional Type-C plug can be detected in time.
As a preferred embodiment, the first surface pin and/or the second surface pin of the Type-C interface includes a positive and negative detection pin, the positive and negative detection pin is connected with a positive and negative detection power supply voltage through a positive and negative detection pull-up resistor R1, and is used for outputting the positive and negative detection power supply voltage when the preset Type-C plug is not inserted, the first surface pin of the preset Type-C plug is connected with the second surface pin of the Type-C interface, and the second surface pin of the preset Type-C plug is grounded when the second surface pin of the preset Type-C plug is connected with the first surface pin of the Type-C interface;
the positive-negative detection circuit 1 comprises a first positive-negative detection comparator Z1, a second positive-negative detection comparator Z2 and a positive-negative detection AND gate ZA;
the negative input terminal of the first positive and negative detection comparator Z1 is connected with the positive and negative detection pin, and the positive input terminal is connected with the maximum positive and negative detection comparison voltage;
the positive input terminal of the second positive and negative detection comparator Z2 is connected with the positive and negative detection pin, and the negative input terminal is connected with the minimum positive and negative detection comparison voltage;
the first input terminal of the positive and negative detection and gate ZA is connected to the output terminal of the first positive and negative detection comparator Z1, the second input terminal thereof is connected to the output terminal of the second positive and negative detection comparator Z2, and the output terminal thereof is connected to the positive and negative signal input terminal of the control module 2, so as to output a low level when the first positive and negative detection comparator Z1 and/or the second positive and negative detection comparator Z2 output a low level;
the control circuit further includes:
the first input end is connected with the output end of the first positive and negative detection comparator Z1, the second input end is connected with the output end of the conventional detection AND gate CA, and the output end is connected with the enable AND gate ENA of the control signal input end of the control module 2, and the enable AND gate ENA is used for outputting an enable signal when the first positive and negative detection comparator Z1 and the conventional detection AND gate CA both output high levels;
the control module 2 is specifically configured to control a first surface pin of the Type-C interface to output a second signal and a second surface pin to output a first signal when receiving the enable signal and receiving the low level output by the positive and negative detection and gate ZA; controlling a first surface pin and a second surface pin of the Type-C interface to stop outputting when the enable signal is not received;
the minimum positive and negative detection comparison voltage is less than the maximum positive and negative detection comparison voltage is less than the positive and negative detection power supply voltage.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a positive and negative detection circuit according to the present invention.
Set up positive and negative detection pin at the first face and/or the second face of Type-C interface in this application. When predetermineeing Type-C plug and reversely inserting, positive and negative detection pin is by ground connection, and when predetermineeing Type-C plug and not inserting, the level of positive and negative detection pin is pulled high by positive and negative detection pull-up resistance R1, and positive and negative detection mains voltage is just listened in the output, and positive and negative detection circuit 1 is through detecting the level height of positive and negative detection pin to the realization detects predetermineeing whether Type-C plug reverse insertion.
Specifically, the positive-negative detection circuit 1 is provided with a first positive-negative detection comparator Z1 and a second positive-negative detection comparator Z2, since the positive input terminal of the first positive-negative detection comparator Z1 is connected to the maximum positive-negative detection comparison voltage, the negative input terminal is connected to the positive-negative detection pin, the positive input terminal of the second positive-negative detection comparator Z2 is connected to the positive-negative detection pin, the negative input terminal is connected to the minimum positive-negative detection comparison voltage, and the minimum positive-negative detection comparison voltage < the maximum positive-negative detection comparison voltage < the positive-negative detection supply voltage, when the preset Type-C plug is inserted in the reverse direction, the first positive-negative detection comparator Z1 outputs a high level due to the voltage of the positive input terminal, that is, the maximum positive-negative detection comparison voltage is greater than the voltage of the negative input terminal, that is, the ground voltage, and the second positive-negative detection comparator Z2 outputs a high level due to the voltage of its own input positive terminal, that is, ground voltage, based on the low level output by the voltage less than the input negative terminal, i.e. the minimum positive and negative detection comparison voltage, the positive and negative detection and gate ZA outputs the low level, i.e. the switching signal, because the second input terminal of the positive and negative detection and gate ZA is at the low level when the preset Type-C is inserted in reverse.
In addition, because the first positive and negative detection comparator Z1 outputs low level when the preset Type-C plug is not inserted, whether the preset Type-C plug is inserted can be judged through the output level of the first positive and negative detection circuit 1, based on this, an enable AND gate ENA is also arranged in the application, when the first positive and negative detection comparator Z1 in the positive and negative detection circuit 1 outputs high level and the conventional detection circuit 3 does not detect the insertion of the conventional Type-C plug, the AND gate ENA is enabled to enable the control module 2, namely the first side pin and the second side pin of the Type-C interface can be controlled to output signals, if the first positive and negative detection comparator Z1 outputs low level and/or the conventional detection circuit 3 detects the insertion of the conventional Type-C plug, the AND gate ENA is enabled to output low level, so as to ensure that the control module 2 is disabled, make each pin not output signal, guarantee that the Type-C interface is not for the plug power supply except presetting the Type-C plug.
Please refer to table 2 for the level of the input and output terminals of the positive and negative detecting circuit 1
TABLE 2 level conditions of the input and output terminals of the positive and negative detection circuit
Input A Output B Output C
VDD Is low in Is low in
R2*VDD/(R1+R2) Height of Height of
0(GND) Is low in Height of
The positive and negative detection preset voltage can be set to R2 × VDD/(R1+ R2) according to the resistance values of the positive and negative detection pull-up resistor R1 and the positive and negative detection pull-down resistor R2.
In a preferred embodiment, the first surface pins of the Type-C interface include a first positive/negative detection pin and a second positive/negative detection pin, the first positive/negative detection pin is connected to the negative input terminal of the first positive/negative detection comparator Z1 and the positive input terminal of the second positive/negative detection comparator Z2, and the second positive/negative detection pin is grounded through a positive/negative detection pull-down resistor R2;
the first surface pins of the preset Type-C plug comprise a third pin correspondingly connected with the first positive and negative detection pin, a fourth pin correspondingly connected with the second positive and negative detection pin, a fifth pin centrosymmetric with the third pin and a sixth pin centrosymmetric with the fourth pin;
the third pin is connected with the fourth pin; the fifth pin and the sixth pin are connected and grounded.
In the embodiment, the first surface and the second surface of the Type-C interface are both provided with positive and negative detection pins, the first positive and negative detection pin is connected with the positive and negative detection circuit 1, the second positive and negative detection pin is grounded through a positive and negative detection pull-down resistor R2, and because the third pin and the fourth pin of the preset Type-C plug are connected, when the preset Type-C plug is inserted in the positive direction, the first positive and negative detection pin and the second positive and negative detection pin of the Type-C interface are connected, so that the first positive and negative detection pin is not grounded and is not used for detecting the supply voltage in the positive and negative direction; and when the preset Type-C plug is reversely inserted, because the fifth pin and the sixth pin of the preset Type-C plug are connected and grounded, the first positive and negative detection pin is grounded, so that the grounding voltage is output.
Based on the setting, positive and negative detection circuit 1 in this application can confirm according to the level height of first positive and negative detection pin whether reverse the inserting of Type-C plug is predetermine.
Referring to fig. 4, a1 in fig. 4 is a third pin, a12 is a fourth pin, B1 is a fifth pin, and B12 is a sixth pin.
In a preferred embodiment, the first positive/negative detection pin is specifically configured to output a positive/negative detection power voltage when the preset Type-C plug is not plugged; connecting a first surface pin of a preset Type-C plug with a second surface pin of a Type-C interface, and grounding when the second surface pin of the preset Type-C plug is connected with the first surface pin of the Type-C interface; when a first surface pin of a preset Type-C plug is connected with a first surface pin of a Type-C interface, and a second surface pin of the preset Type-C plug is connected with a second surface pin of the Type-C interface, outputting a positive and negative detection preset voltage based on the resistance values of a positive and negative detection pull-up resistor R1 and a positive and negative detection pull-down resistor R2;
the control module 2 is further configured to control a first surface pin of the Type-C interface to output a first signal and a second surface pin to output a second signal when receiving the enable signal and receiving the high level output by the positive and negative detection and gate ZA;
the minimum positive and negative detection comparison voltage is less than the positive and negative detection preset voltage and less than the maximum positive and negative detection comparison voltage is less than the positive and negative detection power supply voltage.
When the preset Type-C plug in the embodiment is inserted forward, the first positive and negative detection pin outputs the positive and negative detection preset voltage, and the minimum positive and negative detection comparison voltage < the positive and negative detection preset voltage < the maximum positive and negative detection comparison voltage < the positive and negative detection power supply voltage, at this time, the first positive and negative detection comparator Z1 outputs the high level, the second positive and negative detection comparator Z2 outputs the high level, both the two input ends of the enable and gate ENA input the high level, both the two input ends of the positive and negative detection and gate ZA input the high level, at this time, the control module 2 does not receive the switching signal, but receives the enable signal, and therefore, the first surface pin of the control Type-C interface outputs the first signal, and the second surface pin outputs the second signal.
Based on this, positive and negative detection circuit 1 can guarantee that the Type-C interface can normally export when predetermineeing Type-C plug forward and insert.
The minimum positive and negative detection comparison voltage in the present application can be, but is not limited to, 0.1 times of the positive and negative detection power supply voltage, and the maximum positive and negative detection comparison voltage can be, but is not limited to, 0.9 times of the positive and negative detection power supply voltage.
In a preferred embodiment, the first positive and negative detection pins and the second positive and negative detection pins are axisymmetric.
First positive and negative detection pin and the positive and negative detection pin axial symmetry of second in this application, no matter also predetermine Type-C plug forward insertion or reverse insertion, positive and negative detection circuit 1 homoenergetic detects the inserted state of predetermineeing Type-C plug, and when predetermineeing Type-C plug reverse insertion, if the first face pin output second signal of control Type-C interface, the first signal of the second face pin output of Type-C interface, positive and negative detection circuit 1 also can stop to export switching signal, guarantee that the Type-C interface after the switching can normally export.
In a preferred embodiment, the first surface pin of the Type-C interface comprises a first power supply pin, and the second surface pin comprises a second power supply pin;
the control circuit further includes:
the power supply control module 4 is used for controlling the first power supply pin and the second power supply pin to output power supply voltage when receiving an enabling signal.
First face pin and the second face pin of Type-C interface in this embodiment include the power supply pin respectively, consequently, when making control module 2 enable, also need control power supply control module 4 correspondingly to supply power, just can guarantee the complete output of signal, and is same, when conventional Type-C plug inserts or does not have Type-C plug to insert, no enable signal's input, power supply control module 4 also can not export supply voltage to avoid the appearance of the inside short circuit scheduling problem of Type-C interface. The eFuse in fig. 4 is the power supply control module 4, a11 is the first power supply pin, B11 is the second power supply pin, and the first power supply pin and the second power supply pin are axisymmetric and can be powered regardless of whether the preset Type-C plug is inserted in a forward or reverse direction. The power source connected thereto is P5V, but the present application is not limited thereto.
The signal indication of the control module 2 refers to table 3:
TABLE 3 Signal reception indicator of control module
Enabling EN Selection of S Output ao (n) Output Bo (n)
H (high) H (high) Ai(n) Bi(n)
H (high) L (Low) Bi(n) Ai(n)
L (Low) X Z (high resistance) Z (high resistance)
Wherein EN is a control signal input terminal of the control module 2, and S is a switching signal input terminal of the control module 2. When the signal Ao output by the first surface pin and the signal Bo output by the second surface pin are high impedance, each pin of the Type-C interface does not output. Further, Ai is the first signal, and Bi is the second signal.
For the introduction of the Type-C interface provided by the present invention, please refer to the embodiment of the Type-C interface control circuit, which is not described herein again.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A Type-C interface control circuit is characterized by being applied to a Type-C interface, wherein the Type-C interface comprises a first surface pin and a second surface pin, the first surface pin is used for outputting a first signal set by a user, and the second surface pin is used for outputting a second signal set by the user; the control circuit includes:
the positive and negative detection circuit is connected with the Type-C interface at the input end and is used for outputting a switching signal when detecting that a first surface pin of a preset Type-C plug is connected with a second surface pin of the Type-C interface and the second surface pin of the preset Type-C plug is connected with the first surface pin of the Type-C interface;
the switching signal input end is connected with the output end of the positive and negative detection circuit, the output end of the switching signal input end is connected with the control module connected with the first surface pin and the second surface pin of the Type-C interface, and the control module is used for controlling the first surface pin of the Type-C interface to output the second signal and the second surface pin to output the first signal when receiving the switching signal.
2. The Type-C interface control circuit of claim 1, further comprising:
the conventional detection circuit is connected with the Type-C interface and is used for outputting a failure signal when detecting that a conventional Type-C plug is inserted into the Type-C interface;
and the control signal input end of the control module is connected with the output end of the conventional detection circuit and is also used for controlling the first surface pin and the second surface pin of the Type-C interface to stop outputting when receiving the failure signal.
3. The Type-C interface control circuit according to claim 2, wherein the first surface pin of the Type-C interface includes a first regular detection pin, the second surface pin includes a second regular detection pin, the first regular detection pin and the second regular detection pin are respectively connected to a regular detection power voltage through a regular detection pull-up resistor, and are respectively configured to be grounded through a regular detection pull-down resistor when connected to the pin of the regular Type-C plug, so as to output a regular detection preset voltage, otherwise, the regular detection power voltage is output;
the conventional detection circuit comprises a first conventional detection comparator, a second conventional detection comparator and a conventional detection AND gate;
the input positive end of the first conventional detection comparator is connected with the first conventional detection pin, and the input negative end of the first conventional detection comparator is connected with a conventional detection comparison voltage;
the input positive end of the second conventional detection comparator is connected with the second conventional detection pin, and the input negative end of the second conventional detection comparator is connected with the conventional detection comparison voltage;
the first input end of the conventional detection AND gate is connected with the output end of the first conventional detection comparator, the second input end of the conventional detection AND gate is connected with the output end of the second conventional detection comparator, and the output end of the conventional detection AND gate is connected with the control signal input end of the control module and is used for outputting the failure signal when the first conventional detection comparator and/or the second conventional detection comparator outputs a low level;
the conventional detection preset voltage is less than the conventional detection comparison voltage is less than the conventional detection power supply voltage.
4. The Type-C interface control circuit of claim 3, wherein the first regular snoop pin and the second regular snoop pin are centered on the Type-C interface;
the preset Type-C plug comprises a first pin and a second pin, wherein the first pin is correspondingly connected with the first conventional detection pin, the second pin is correspondingly connected with the second conventional detection pin, and the first pin and the second pin are centrosymmetric and are suspended.
5. The Type-C interface control circuit according to claim 3, wherein the first surface pin and/or the second surface pin of the Type-C interface includes a positive and negative detection pin, the positive and negative detection pin is connected to a positive and negative detection power voltage through a positive and negative detection pull-up resistor, and is configured to output the positive and negative detection power voltage when the preset Type-C plug is not inserted, and is configured to be grounded when the first surface pin of the preset Type-C plug is connected to the second surface pin of the Type-C interface, and the second surface pin of the preset Type-C plug is connected to the first surface pin of the Type-C interface;
the positive and negative detection circuit comprises a first positive and negative detection comparator, a second positive and negative detection comparator and a positive and negative detection AND gate;
the input negative end of the first positive and negative detection comparator is connected with the positive and negative detection pin, and the input positive end of the first positive and negative detection comparator is connected with the maximum positive and negative detection comparison voltage;
the positive input end of the second positive and negative detection comparator is connected with the positive and negative detection pin, and the negative input end of the second positive and negative detection comparator is connected with the minimum positive and negative detection comparison voltage;
the first input end of the positive and negative detection AND gate is connected with the output end of the first positive and negative detection comparator, the second input end of the positive and negative detection AND gate is connected with the output end of the second positive and negative detection comparator, and the output end of the positive and negative detection AND gate is connected with the positive and negative signal input end of the control module and used for outputting a low level when the first positive and negative detection comparator and/or the second positive and negative detection comparator outputs a low level;
the control circuit further includes:
the first input end of the first positive and negative detection comparator is connected with the output end of the first positive and negative detection comparator, the second input end of the first positive and negative detection comparator is connected with the output end of the conventional detection AND gate, and the output end of the first positive and negative detection comparator is connected with the control signal input end of the control module;
the control module is specifically configured to control a first surface pin of the Type-C interface to output the second signal and a second surface pin to output the first signal when receiving the enable signal and receiving the low level output by the positive and negative detection and gate; controlling the first surface pin and the second surface pin of the Type-C interface to stop outputting when the enabling signal is not received;
the minimum positive and negative detection comparison voltage is less than the maximum positive and negative detection comparison voltage is less than the positive and negative detection power supply voltage.
6. The Type-C interface control circuit of claim 5, wherein the first surface pin of the Type-C interface comprises a first positive and negative detection pin and a second positive and negative detection pin, the first positive and negative detection pin is connected to the negative input terminal of the first positive and negative detection comparator and the positive input terminal of the second positive and negative detection comparator, and the second positive and negative detection pin is grounded through a positive and negative detection pull-down resistor;
the first surface pins of the preset Type-C plug comprise a third pin correspondingly connected with the first positive and negative detection pin, a fourth pin correspondingly connected with the second positive and negative detection pin, a fifth pin centrosymmetric with the third pin and a sixth pin centrosymmetric with the fourth pin;
the third pin is connected with the fourth pin; the fifth pin and the sixth pin are connected and grounded.
7. The Type-C interface control circuit of claim 6, wherein the first positive and negative detection pin is specifically configured to output the positive and negative detection power voltage when the preset Type-C plug is not plugged in; connecting a first surface pin of the preset Type-C plug with a second surface pin of the Type-C interface, and grounding when the second surface pin of the preset Type-C plug is connected with the first surface pin of the Type-C interface; when a first surface pin of the preset Type-C plug is connected with a first surface pin of the Type-C interface, and a second surface pin of the preset Type-C plug is connected with a second surface pin of the Type-C interface, outputting a positive and negative detection preset voltage based on the resistance values of the positive and negative detection pull-up resistor and the positive and negative detection pull-down resistor;
the control module is further configured to control a first surface pin of the Type-C interface to output the first signal and a second surface pin of the Type-C interface to output the second signal when receiving the enable signal and receiving the high level output by the positive and negative detection and gate;
the minimum positive and negative detection comparison voltage is less than the positive and negative detection preset voltage is less than the maximum positive and negative detection comparison voltage is less than the positive and negative detection power supply voltage.
8. The Type-C interface control circuit of claim 6, wherein the first positive and negative detect pin and the second positive and negative detect pin are axisymmetric.
9. The Type-C interface control circuit of claim 5, wherein the first plane pin of the Type-C interface comprises a first power supply pin and the second plane pin comprises a second power supply pin;
the control circuit further includes:
the power supply control module is used for controlling the first power supply pin and the second power supply pin to output the power supply voltage when receiving the enabling signal.
10. A Type-C interface comprising the Type-C interface control circuit of any one of claims 1-9.
CN202111472361.2A 2021-12-06 2021-12-06 Type-C interface control circuit and Type-C interface Active CN113868175B (en)

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CN209460757U (en) * 2019-04-09 2019-10-01 深圳市智微智能科技开发有限公司 A kind of positive anti-plug identification circuit of USB TYPE-C equipment
CN209514602U (en) * 2019-04-17 2019-10-18 深圳市星禾宏泰自动化设备有限公司 A kind of front and back sides USB Type-C automatic switching interface circuit
CN211742107U (en) * 2020-09-09 2020-10-23 武汉精立电子技术有限公司 USB TYPE-C-based bidirectional transmission circuit and electronic equipment
CN112100106A (en) * 2020-09-30 2020-12-18 深圳市嘉润原新显科技有限公司 HDMI positive and negative plug control circuit and terminal display device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107665177A (en) * 2017-11-23 2018-02-06 立讯精密工业（滁州）有限公司 USB switching techniques based on USB Type C frameworks
CN209460757U (en) * 2019-04-09 2019-10-01 深圳市智微智能科技开发有限公司 A kind of positive anti-plug identification circuit of USB TYPE-C equipment
CN209514602U (en) * 2019-04-17 2019-10-18 深圳市星禾宏泰自动化设备有限公司 A kind of front and back sides USB Type-C automatic switching interface circuit
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