Type-C insertion direction detection circuit, circuit board, and electronic device

Abstract

The present application provides a Type-C insertion direction detection circuit, a circuit board, and an electronic device, and relates to the technical field of the detection circuit. The detection circuit is applied to an electronic device, the electronic device includes a Type-C socket, and the detection circuit includes a switch module, an input terminal of the switch module is configured to be connected to a VBUS terminal of the Type-C socket, the input terminal of the switch module is configured to be connected to a first CC terminal and / or a second CC terminal of the Type-C socket, the switch module is configured to change an on state according to a first level received at the input terminal and input by the first CC terminal and / or the second CC terminal, and output a second level at a drive terminal of the switch module, so that the electronic device determines the insertion relationship between the Type-C plug and the Type-C socket according to the second level.

Description

[Technical field]

[0001] This application is filed based on a Chinese patent application bearing application number 202210815132.4 and filing date July 12, 2022, and claims priority to the Chinese patent application, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of detection circuits, but is not limited thereto, and in particular to a Type-C insertion orientation detection circuit, a circuit board, and an electronic device. [Background technology]

[0003] Related technologies use a dedicated Type-C insertion direction detection chip to detect the Type-C insertion direction, but the detection using the chip is expensive, and the chip is controlled by software, which may become unstable after long-term use, affecting the detection of the Type-C insertion direction. Summary of the Invention [Problem to be solved by the invention]

[0004] The following is a summary of subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0005] The embodiments of the present application provide a Type-C insertion direction detection circuit, a circuit board, and an electronic device. [Means for solving the problem]

[0006] In a first aspect, the present embodiment comprises: A Type-C insertion direction detection circuit for use in an electronic device including a Type-C socket, the detection circuit comprising: a switch module; the input terminal of the switch module is configured to be connected to a VBUS terminal of the Type-C socket, the input terminal of the switch module is configured to be connected to a first CC terminal and / or a second CC terminal of the Type-C socket, and the switch module is configured to change an on state according to a first level received at the input terminal and input by the first CC terminal and / or the second CC terminal, and to output a second level at a drive terminal of the switch module, so that the electronic device determines an insertion relationship between a Type-C plug and the Type-C socket according to the second level.

[0007] In a second aspect, the present application also provides a circuit board comprising a detection circuit according to any one of the embodiments of the first aspect.

[0008] In a third aspect, the present application also provides an electronic device comprising a circuit board according to any one of the embodiments of the second aspect.

[0009] Other features and advantages of the present application will be set forth in the following specification, and in part will be obvious, or will be learned by the practice of the present application. The objectives and other advantages of the present application may be realized and obtained by the structure particularly pointed out in the written description, claims and drawings. The drawings are intended to provide a further understanding of the technical solution of the present application, constitute a part of the specification, and are intended to explain the technical solution of the present application together with the embodiments of the present application, and are not intended to limit the technical solution of the present application. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a circuit diagram of a Tpye-C insertion direction detection circuit according to an embodiment of the present application. [Diagram 2] FIG. 13 is a circuit diagram of a Tpye-C insertion direction detection circuit according to another embodiment of the present application. [Diagram 3] FIG. 13 is a circuit diagram of a Tpye-C insertion direction detection circuit according to another embodiment of the present application. [Figure 4]FIG. 1 is a schematic diagram of a circuit board according to an embodiment of the present application. [Diagram 5] FIG. 1 is a schematic diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be described in more detail below with reference to the drawings and examples. The specific examples described in this specification are only used to interpret the present application, and are not used to limit the present application.

[0012] In some embodiments, a division of functional modules is made in the schematic diagram of the device and a logical order is shown in the flowchart, but in some cases, the division of modules within the device may differ, or the steps shown or described may be performed in a different order than in the flowchart. Terms such as "first," "second," and the like in the specification and claims and in the drawings are intended to distinguish between similar objects and are not intended to describe a particular order or priority.

[0013] In addition, the term "one embodiment" or "some embodiments" in the specification of the embodiments of the present application means that one or more of the embodiments of the present application include the particular feature, structure, or characteristic described in connection with that embodiment. Thus, the phrases "in one embodiment," "in some embodiments," "in some other embodiments," "in some other embodiments," and the like in different places in this specification do not necessarily refer to the same embodiment, and mean "one or more embodiments, but not all embodiments," unless otherwise specifically emphasized. The terms "include," "includes," "having," and variations thereof mean "including, but not limited to," unless otherwise specifically emphasized.

[0014] In recent years, Type-C has been adopted as the interface type for most electronic devices. Type-C is a new universal serial bus hardware interface format that was born along with the latest USB3.1 standard. Type-C is a new interface developed by the USB standardization organization to solve the long-standing shortcomings of the USB interface, such as inconsistent physical interface specifications and one-way power transmission. The biggest feature of its appearance is that the top and bottom ends are exactly the same, and compared to Micro-USB, there is no need to distinguish between the front and back of the USB, and it supports insertion in both directions. It also integrates functions such as charging, display, and data transmission. Due to its excellent performance, it is rapidly popular in the electronic equipment field. Currently, almost all new generation mobile communication devices support the TYPE-C interface. In related technology, a dedicated Type-C insertion direction detection chip is used to detect the Type-C insertion direction. That is, the program detects whether the CC pin of the socket is connected to the CC1 pin or CC2 pin of the plug, and determines whether the A side or B side of the Type-C plug is inserted, and controls the switching position of USB3.0. However, this method requires the use of a chip and is controlled by software, so it may become unstable after long-term use, which may affect the detection of the Type-C insertion direction.

[0015] Hereinafter, the embodiments of the present application will be further described with reference to the drawings.

[0016] In a first aspect, the present application provides a Type-C insertion direction detection circuit for use in an electronic device, the detection circuit including a switch module, an input terminal of the switch module configured to be connected to a VBUS terminal of a Type-C socket, the input terminal of the switch module configured to be connected to a first CC terminal and / or a second CC terminal of the Type-C socket, the switch module configured to change an ON state according to a first level received at the input terminal and input by the first CC terminal and / or the second CC terminal, and output a second level at a drive terminal of the switch module, so that the electronic device determines the insertion relationship between the Type-C plug and the Type-C socket according to the second level. The switch module is connected to the Type-C socket and the VBUS terminal is used as an input terminal, thereby securing a voltage for the output level of the output terminal. The switch module changes its own ON state according to the level of the first CC terminal and / or the second CC terminal by an internal electronic device, thereby changing the flow of current from the input terminal to the output terminal. The driving terminal is configured to feedback the plugging relationship between the Type-C plug and the Type-C socket, i.e., feedback whether the A side or the B side of the Type-C plug is inserted. In this application, the insertion direction of the Type-C plug can be detected by an electronic device in the switch module, which effectively reduces the circuit cost and improves the reliability of the circuit.

[0017] 1, in one embodiment, when the electronic device is a Device device, that is, a driving device, the first CC terminal of the Type-C socket is grounded by the first resistor R1, the switch module includes a first switch tube Q1, the input terminal of the first switch tube Q1 is connected to the VBUS terminal, the control terminal of the first switch tube Q1 is connected to the second CC terminal, and the output terminal of the first switch tube Q1 is grounded. The detection circuit further includes a delay filter circuit, the input terminal of the delay filter circuit is connected between the input terminal of the first switch tube Q1 and the VBUS terminal, and the output terminal of the delay filter circuit is the driving terminal. In the circuit according to this embodiment, when the A side of the Type-C plug is inserted into the Type-C socket, the USB_VBUS terminal is at a high level, the USB_CC1 is at a high level, and the USB_CC2 is at a low level, therefore, the first switch tube Q1 is not turned on, and the driving terminal USB_DIR is at a high level. When the B side of the Type-C plug is inserted into the Type-C socket, the USB_VBUS terminal is at a high level, the USB_CC1 is at a low level, and the USB_CC2 is at a high level, so the first switch tube Q1 is turned on, and in this case, the current flows directly from the USB_VBUS through the Q1 to the ground terminal without passing through the delay filter circuit, and the driving terminal USB_DIR is at a low level. That is, in this embodiment, when the level at the USB_DIR is detected to be at a high level, it indicates that the A side is inserted as the insertion direction of the Type-C, and when the USB_DIR is detected to be at a low level, it indicates that the B side is inserted as the insertion direction of the Type-C. In addition, in one embodiment, the first resistor R1 is set to 5.1 kΩ, but this is not limited in the present application.

[0018] The Device may be a memory device such as a USB flash drive, an MP3 electronic device, or a hard disk.

[0019] Continuing to refer to FIG. 1, a second resistor R2 is provided between the input terminal of the first switch tube Q1 and the VBUS terminal, the second resistor R2 is a pull-up resistor, which keeps the input terminal of the first switch tube Q1 at a high level and improves the stability of the detection circuit. In one embodiment, the second resistor R2 is 47kΩ, but is not limited thereto in the present application.

[0020] 2, the switch module further includes a second switch tube Q2, which is disposed between the input terminal of the first switch tube Q1 and the delay filter circuit, the input terminal of the second switch tube Q2 is connected to the VBUS terminal by the third resistor R3, the control terminal of the second switch tube Q2 is connected between the input terminal of the first switch tube Q1 and the second resistor R2, the output terminal of the second switch tube Q2 is grounded, and the input terminal of the delay filter circuit is connected between the input terminal of the second switch tube Q2 and the third resistor R3. In order to synchronize the level of the drive terminal USB_DIR and the level of the second CC terminal USB_CC2, in the circuit diagram scheme of FIG. 2, a second switch tube Q2 is added, which plays the role of logical inversion. In one embodiment, when the A side of the Type-C plug is inserted into the Type-C socket, the USB_VBUS terminal is at a high level, the USB_CC1 is at a high level, and the USB_CC2 is at a low level, the first switch tube Q1 is not turned on, and the control terminal of the second switch tube Q2 is at a high level, and the second switch tube Q2 is turned on, so that the driving terminal USB_DIR is at a low level. When the B side of the Type-C plug is inserted into the Type-C socket, the USB_VBUS terminal is at a high level, the USB_CC1 is at a low level, and the USB_CC2 is at a high level, at this time the first switch tube Q1 is turned on, the second switch tube Q2 is not turned on, and the USB_DIR is at a high level. According to the circuit diagram of FIG. 2, the level of the driving terminal USB_DIR is synchronized with the level of the second CC terminal USB_CC2. The third resistor R3 and the second resistor R2 both function as pull-up resistors to keep the potentials of the input terminals of the first switch tube Q1 and the second switch tube Q2 at a high level, thereby improving the stability of the detection circuit. In one embodiment, the third resistor R3 is 47 kΩ, but this application is not limited thereto.

[0021] 2, the delay filter circuit includes a fourth resistor R4 and a first capacitor C1, one end of the fourth resistor R4 is connected to one end of the first capacitor C1, the other end of the fourth resistor R4 is connected between the input terminal of the second switch tube Q2 and the third resistor R3, the other end of the first capacitor C1 is grounded, and the driving terminal is provided between the fourth resistor R4 and the first capacitor C1. The delay filter circuit eliminates the interference signal of USB_VBUS and satisfies the power-up sequence and power-down sequence of the first switch tube Q1 and the second switch tube Q2. In one embodiment, the fourth resistor R4 is 1kΩ, and the first capacitor C1 is 10nF, but is not limited in the present application.

[0022] 2, the detection circuit of the present application further includes a fifth resistor R5 and a sixth resistor R6, one end of the fifth resistor R5 and one end of the sixth resistor R6 are both connected to the control terminal of the first switch tube Q1, the other end of the fifth resistor R5 is connected to the second CC terminal of the first Type-C socket, and the other end of the sixth resistor R6 is grounded. In this circuit, the fifth resistor R5 plays the role of protecting the resistor, avoiding the first switch tube Q1 being damaged due to too high voltage, and plays a certain voltage dividing role, while the sixth resistor R6 is a pull-down resistor, improving the stability of the detection circuit.

[0023] Note that the connection positions of the first CC terminal USB_CC1 and the second CC terminal USB_CC2 are interchangeable and are not limited in this application.

[0024] In addition, the first switch tube Q1 and the second switch tube Q2 may be a triode or a field effect transistor. In the embodiment of the present application, the first switch tube Q1 and the second switch tube Q2 are NPN triodes, the input terminals of the first switch tube Q1 and the second switch tube Q2 are the collectors of the NPN triodes, the control terminals of the first switch tube Q1 and the second switch tube Q2 are the bases of the NPN triodes, and the output terminals of the first switch tube Q1 and the second switch tube Q2 are the emitters of the NPN triodes.

[0025] 3, in another embodiment, when the electronic device is a Host device, the switch module includes a third switch tube Q3 and a fourth switch tube Q4, the input terminal of the third switch tube Q3 is connected to the VBUS terminal of the Type-C socket, the control terminal of the third switch tube Q3 is connected to the first CC terminal of the Type-C socket and connected to the VBUS terminal through the first resistor network, the output terminal of the third switch tube Q3 is grounded through the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 in this order, and an enable terminal is provided between the seventh resistor R7 and the eighth resistor R8. The enable terminal is configured to indicate whether the Type-C socket is inserted. It may also be configured to supply power to the subsequent driving chip. The input terminal of the fourth switch tube Q4 is connected to the VBUS terminal of the Type-C socket, the control terminal of the fourth switch tube Q4 is connected to the second CC terminal of the Type-C socket and connected to the VBUS terminal through the second resistor network, and the output terminal of the fourth switch tube Q4 is connected between the eighth resistor R8 and the ninth resistor R9. The driving terminal is provided between the eighth resistor R8 and the ninth resistor R9 by the tenth resistor R10. Here, the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 form a series voltage divider circuit, which affects the driving terminal level when the A side of the Type-C plug is inserted or the B side is inserted. In one embodiment, the A side of the Type-C plug is inserted into the Type-C socket, and the USB_VBUS terminal is at a high level, in this case, the first CC terminal USB_CC1 is connected to the pull-down resistor of the CC terminal in the Type-C plug, making the USB_CC1 terminal at a low level, so that the third switch tube Q3 is turned on. Due to the action of the VBUS terminal and the second resistor network, the fourth switch tube Q4 does not meet the condition to be turned on, so the fourth switch tube Q4 does not turn on, and the current flows from the VBUS terminal through the output terminal of the third switch tube Q3, and after passing through the seventh resistor R7, the enable terminal becomes high level, and the drive terminal outputs low level due to the voltage divider circuit formed by the seventh resistor R7, the eighth resistor R8, and the ninth resistor R9.Similarly, when the B side of the Type-C plug is inserted into the Type-C socket, the USB_VBUS terminal is at a high level, and at this time, the second CC terminal USB_CC2 is connected to the pull-down resistor of the CC terminal of the Type-C plug to make the USB_CC2 terminal at a low level, so that the fourth switch tube Q4 is turned on, and due to the action of the VBUS terminal and the first resistor network, the third switch tube Q3 does not meet the condition to be turned on, so the third switch tube Q3 is not turned on, and the current flows from the VBUS terminal through the output terminal of the fourth switch tube Q4, and after passing through the eighth resistor R8, the enable terminal is at a high level, and after passing through the tenth resistor R10, the drive terminal is at a high level. That is, when the driving terminal is at a low level, it indicates that the A side of the Type-C plug is inserted into the Type-C socket, when the driving terminal is at a high level, it indicates that the A side of the Type-C plug is inserted into the Type-C socket, when the driving terminal is at a low level, it indicates that the B side of the Type-C plug is inserted into the Type-C socket. Through the allocation of the third switch tube Q3, the fourth switch tube Q4 and multiple resistors, the insertion direction of the Type-C plug is detected using hardware, which effectively reduces the circuit cost and improves the reliability of the circuit.

[0026] The host device may be a device such as a computer or a background controller.

[0027] 3, the seventh resistor R7 and the enable terminal are connected to ground by the second capacitor C2, the drive terminal is provided between the eighth resistor R8 and the ninth resistor R9 by the tenth resistor R10, and the tenth resistor R10 and the drive terminal are connected to ground by the third capacitor C3. Here, the circuit consisting of the second capacitor C2, the tenth resistor R10, and the third capacitor C3 performs a filtering function to make the levels of the enable terminal and the drive terminal more stable. In one embodiment, the second capacitor C2 and the third capacitor C3 may be 0.1 μF, and the tenth resistor R10 may be 1 kΩ, but this application is not limited thereto.

[0028] Continuing to refer to FIG. 3, the first resistor network includes an eleventh resistor R11, a twelfth resistor R12, and a thirteenth resistor R13, where one end of the eleventh resistor R11, the twelfth resistor R12, and the thirteenth resistor R13 are connected to each other, the other end of the eleventh resistor R11 is connected to the VBUS terminal, the other end of the twelfth resistor R12 is connected to the first CC terminal, and the other end of the thirteenth resistor R13 is connected to the control terminal of the third switch tube Q3. The second resistor network includes a 14th resistor R14, a 15th resistor R15, and a 16th resistor R16, and one end of the 14th resistor R14, the 15th resistor R15, and the 16th resistor R16 are connected to each other, the other end of the 14th resistor R14 is connected to the VBUS terminal, the other end of the 15th resistor R15 is connected to the second CC terminal, and the other end of the 16th resistor R16 is connected to the control terminal of the fourth switch tube Q4. In one embodiment, according to the Type-C specification, the resistance value of the 11th resistor R11 and the 14th resistor R14 is 12 kΩ, the resistance value of the 12th resistor R12 and the 15th resistor R15 is 27 kΩ, and the resistance value of the 13th resistor R13 and the 16th resistor R16 is 4.7 kΩ. The specific resistance values ​​of the above resistors are not particularly limited in this application.

[0029] In addition, the third switch tube Q3 and the fourth switch tube Q4 may be a triode or a field effect transistor. In the embodiment of the present application, the third switch tube Q3 and the fourth switch tube Q4 are PNP triodes, the input terminals of the third switch tube Q3 and the fourth switch tube Q4 are the emitters of the PNP triodes, the control terminals of the third switch tube Q3 and the fourth switch tube Q4 are the bases of the PNP triodes, and the output terminals of the third switch tube Q3 and the fourth switch tube Q4 are the collectors of the PNP triodes.

[0030] The present application also provides a circuit board including the Type-C insertion orientation detection circuit according to any of the above embodiments.

[0031] The present application also provides an electronic device including a circuit board according to the above embodiment.

[0032] In the embodiment of the present application, the switch module is connected to a Type-C socket, and in one embodiment, the input terminal of the switch module is connected to the VBUS terminal of the Type-C socket, the control terminal of the switch module is connected to the first CC terminal and / or the second CC terminal of the Type-C socket, the output terminal of the switch module is the driving terminal, and the VBUS terminal is the input terminal, thereby ensuring a voltage for the output level of the output terminal. The switch module changes its own on state according to the level of the first CC terminal and / or the second CC terminal by an internal electronic device, thereby changing the flow of current from the input terminal to the output terminal. The driving terminal is configured to feedback the insertion relationship between the Type-C plug and the Type-C socket, i.e., feedback whether the A side or the B side of the Type-C plug is inserted. In the present application, the insertion direction of the Type-C plug can be detected by the electronic device in the switch module, which effectively reduces the circuit cost and improves the reliability of the circuit.

[0033] Although the above describes in detail some embodiments of the present application, the present application is not limited to the above embodiments, and a person skilled in the art may make various equivalent modifications or substitutions without departing from the essence of the present application, and all of these equivalent modifications or substitutions are included in the scope limited by the claims of the present application.

Claims

1. A Type-C insertion direction detection circuit for use in an electronic device including a Type-C socket, the detection circuit including a switch module; a detection circuit configured to: an input terminal of the switch module be connected to a VBUS terminal of the Type-C socket; an input terminal of the switch module be connected to a first CC terminal and / or a second CC terminal of the Type-C socket; and the switch module change an on state in response to a first level received at the input terminal and input by the first CC terminal and / or the second CC terminal, and output a second level at a drive terminal of the switch module, thereby causing the electronic device to determine an insertion relationship between a Type-C plug and the Type-C socket in response to the second level.

2. 2. The detection circuit of claim 1, wherein when the electronic device is a driving device, the first CC terminal is grounded by a first resistor, the switch module includes a first switch tube, an input terminal of the first switch tube is connected to the VBUS terminal, a control terminal of the first switch tube is connected to a second CC terminal, an output terminal of the first switch tube is grounded, and the driving terminal is provided between the input terminal of the first switch tube and the VBUS terminal.

3. 3. The detection circuit of claim 2, further comprising a delay filter circuit, an input terminal of the delay filter circuit being connected between the input terminal of the first switch tube and the VBUS terminal, and an output terminal of the delay filter circuit being a drive terminal.

4. 4. The detection circuit of claim 3, further comprising a second resistor provided between the input terminal of the first switch tube and the VBUS terminal.

5. 5. The detection circuit of claim 4, wherein the switch module further includes a second switch tube, the second switch tube being disposed between the input terminal of the first switch tube and the delay filter circuit, the input terminal of the second switch tube being connected to the VBUS terminal by a third resistor, the control terminal of the second switch tube being connected between the input terminal of the first switch tube and the second resistor, the output terminal of the second switch tube being grounded, and the input terminal of the delay filter circuit being connected between the input terminal of the second switch tube and the third resistor.

6. 6. The detection circuit of claim 5, wherein the delay filter circuit includes a fourth resistor and a first capacitor, one end of the fourth resistor is connected to one end of the first capacitor, the other end of the fourth resistor is connected between the input terminal of the second switch tube and the third resistor, the other end of the first capacitor is grounded, and the drive terminal is provided between the fourth resistor and the first capacitor.

7. 7. The detection circuit of claim 6, further comprising a fifth resistor and a sixth resistor, one end of the fifth resistor and one end of the sixth resistor are both connected to the control terminal of the first switch tube, the other end of the fifth resistor is connected to a second CC terminal of the first Type-C socket, and the other end of the sixth resistor is grounded.

8. When the electronic device is a host device, the switch module includes a third switch tube and a fourth switch tube; The input terminal of the third switch tube is connected to the VBUS terminal of the Tpye-C socket, the control terminal of the third switch tube is connected to the first CC terminal of the Tpye-C socket and to the VBUS terminal via a first resistor network, the output terminal of the third switch tube is grounded through a seventh resistor, an eighth resistor, and a ninth resistor in this order, and an enable terminal is provided between the seventh resistor and the eighth resistor; The input terminal of the fourth switch tube is connected to the VBUS terminal of the Tpye-C socket, the control terminal of the fourth switch tube is connected to the second CC terminal of the Tpye-C socket and connected to the VBUS terminal through a second resistor network, and the output terminal of the fourth switch tube is connected between the eighth resistor and the ninth resistor; The detection circuit according to claim 1 , wherein the drive terminal is provided between the eighth resistor and the ninth resistor.

9. 9. The detection circuit of claim 8, wherein a second capacitor is provided between the seventh resistor and the enable terminal, the drive terminal is provided between the eighth resistor and the ninth resistor by a tenth resistor, and a third capacitor is provided between the tenth resistor and the drive terminal.

10. 10. The detection circuit of claim 9, wherein the first resistor network includes an eleventh resistor, a twelfth resistor, and a thirteenth resistor, one ends of the eleventh resistor, the twelfth resistor, and the thirteenth resistor are connected to each other, the other end of the eleventh resistor is connected to the VBUS terminal, the other end of the twelfth resistor is connected to the first CC terminal, and the other end of the thirteenth resistor is connected to the control terminal of the third switch tube; the second resistor network includes a fourteenth resistor, a fifteenth resistor, and a sixteenth resistor, one ends of the fourteenth resistor, the fifteenth resistor, and the sixteenth resistor are connected to each other, the other end of the fourteenth resistor is connected to the VBUS terminal, the other end of the fifteenth resistor is connected to the second CC terminal, and the other end of the sixteenth resistor is connected to the control terminal of the fourth switch tube.

11. A circuit board comprising the detection circuit according to any one of claims 1 to 9.

12. An electronic device comprising the circuit board according to claim 10.

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