Application circuit of TYPE-C interface and electronic equipment

Abstract

The embodiment of the invention provides an application circuit of a TYPE-C interface and electronic equipment, and the application circuit comprises the components of the TYPE-C interface which comprises a plurality of power supply pins, a first detection pin is arranged beside each power supply pin, the power supply pins are used for inputting voltage, the power supply pins are connected with a charging output end, and the charging output end is used for external charging; and the controller is connected with each first detection pin and is used for judging whether liquid or water vapor exists in the TYPE-C interface or not according to the voltage of the first detection pin. In the application circuit provided by the embodiment of the invention, the plurality of power supply pins of the TYPE-C interface can be used for external charging, and the first detection pin arranged beside the power supply pins can be used for judging whether liquid or water vapor exists in the TYPE-C interface or not, so that charging and water inflow function detection can be realized, additional components are not needed, and the cost is reduced. The application circuit is simple in circuit and less in components, and can save the layout space of a PCB (Printed Circuit Board).

Description

Technical Field

[0001] This application relates to the field of TYPE-C interface technology, and in particular to an application circuit and electronic device with a TYPE-C interface. Background Technology

[0002] Due to the limited internal space of consumer electronics products such as headphones and portable speakers, there are strict restrictions on the size of circuit boards (PCBs) and the height of components, which prevents the use of too many components. As a result, the TYPE-C interface of existing portable consumer electronics products has relatively limited functionality, with most only supporting charging functions, leading to low utilization of the TYPE-C interface. Summary of the Invention

[0003] This application provides an application circuit and electronic device with a TYPE-C interface. The application circuit has a simple circuit line and few components, which can save PCB layout space and is easy to apply to electronic devices with limited internal space.

[0004] This application provides an application circuit for a TYPE-C interface, including: The TYPE-C interface includes multiple power pins, each of which has a first detection pin next to it. The power pins are used for input voltage and are connected to a charging output terminal, which is used for external charging. The controller is connected to each of the first detection pins and is used to determine whether there is liquid or water vapor inside the TYPE-C interface based on the voltage of the first detection pin.

[0005] In some embodiments, the plurality of power supply pins are connected to each other and connected to the charging output terminal via a positive temperature coefficient thermistor, which disconnects the charging output terminal when the charging current or charging voltage is abnormal.

[0006] In some embodiments, the detection current threshold of the positive temperature coefficient thermistor is 4A and the detection voltage threshold is 32V.

[0007] In some embodiments, there are four power supply pins, which are arranged in a distributed manner.

[0008] In some embodiments, the TYPE-C interface further includes a plurality of second detection pins connected to the controller. The second detection pins are used to output asynchronous serial communication data of the controller, and the asynchronous serial communication data is used to identify error information of the controller.

[0009] In some embodiments, each of the second detection pins is disposed next to one of the first detection pins.

[0010] In some embodiments, the TYPE-C interface further includes a plurality of data transmission pins connected to the controller, the data transmission pins being used to transmit audio signals or transmit software update data to upgrade the controller.

[0011] In some embodiments, a negative temperature coefficient thermistor is also included, which is disposed near the TYPE-C interface and connected to the controller, which is used to detect the temperature of the TYPE-C interface based on the voltage of the negative temperature coefficient thermistor.

[0012] In some embodiments, the controller includes a power output pin and a detection pin. The power output pin is connected to one end of the negative temperature coefficient thermistor through a voltage divider resistor, and the other end of the negative temperature coefficient thermistor is grounded. The detection pin is connected between the voltage divider resistor and the negative temperature coefficient thermistor.

[0013] This application also provides an electronic device, including the application circuit of any of the above embodiments.

[0014] In the application circuit of this application embodiment, multiple power pins of the TYPE-C interface can be used for external charging, and the first detection pin located next to the power pins can be used to determine whether there is liquid or water vapor inside the TYPE-C interface. Therefore, charging and water ingress detection can be realized without adding additional components. The application circuit is simple and has few components, which can save PCB layout space and is convenient for application in consumer electronic products with small internal space, such as headphones and portable speakers. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the application circuit of the TYPE-C interface according to an embodiment of this application.

[0017] Figure 2 This is a schematic diagram showing the connection relationship of the negative temperature coefficient thermistors in the application circuit of the TYPE-C interface according to an embodiment of this application. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0019] This application provides an application circuit for a TYPE-C interface. The application circuit has a simple circuit line and few components, which can save PCB layout space and is easy to apply in consumer electronic products with small internal space, such as headphones and portable speakers.

[0020] refer to Figure 1 , Figure 1 This is a schematic diagram of the application circuit of the TYPE-C interface according to an embodiment of this application. The application circuit of the TYPE-C interface includes the TYPE-C interface (… Figure 1 (Represented as USB1 in Chinese). The TYPE-C interface includes multiple pins, A1~A12, B1~B12, and 1~6. Pins A1~A12 are located on one long side of the interface, pins B1~B12 are located on the other long side, and pins 1~6 are located on one short side. Specifically, A1 is the GND pin, A2 is the TX1+ pin, A3 is the TX1- pin, A4 is the VBUS pin, A5 is the CC1 pin, A6 is the D+1 pin, A7 is the D-1 pin, A8 is the SBU1 pin, A9 is the VBUS pin, A10 is the RX2- pin, A11 is the RX2+ pin, and A12 is the GND pin. B1 is the GND pin, B2 is the TX2+ pin, B3 is the TX2- pin, B4 is the VBUS pin, B5 is the CC2 pin, B6 is the D+2 pin, B7 is the D-2 pin, B8 is the SBU2 pin, B9 is the VBUS pin, B10 is the RX1- pin, B11 is the RX1+ pin, and B12 is the GND pin. Pins 1 through 6 are all GND pins.

[0021] In this embodiment, the TYPE-C interface includes multiple power supply pins (VBUS). For example, in one example, there are four power supply pins, which are distributed among the others; for example, the four power supply pins can be A4, A9, B4, and B9 (VBUS pins). The power supply pins (VBUS) are used for input voltage. The power supply pins (VBUS) are connected to the charging output terminal (…). Figure 1 The VBUS terminal (connected to pin B9) is used for external charging. In practical applications, the input current (or input voltage) enters through the VBUS power pin of the TYPE-C interface and is then output through the VBUS terminal for external charging, such as charging the batteries of electronic products like headphones and portable speakers, thereby charging the subsequent systems.

[0022] In some embodiments, such as Figure 1 As shown, multiple power supply pins VBUS (A4, A9, B4, B9) are connected to each other and connected via positive temperature coefficient thermistors (PTCs). Figure 1 The positive temperature coefficient thermistor (FUSH1) is connected to the charging output terminal (line terminal VBUS). FUSH1 disconnects the charging output terminal when the charging current or voltage is abnormal, thus protecting the downstream circuitry and preventing damage caused by abnormal charging current or voltage. Therefore, it enables overcurrent and overvoltage protection during the charging process.

[0023] Understandably, the resistance of a positive temperature coefficient thermistor (PTC) increases with temperature. When the temperature exceeds a critical value (Curie temperature), the internal crystal structure of the material undergoes abrupt changes, and the resistance increases exponentially, making the PTC itself an open circuit, thereby disconnecting the connected charging output terminal (line terminal VBUS).

[0024] In some embodiments, the detection current threshold of the positive temperature coefficient thermistor (FUSH1) is 4A, and the detection voltage threshold is 32V. When the charging current exceeds 4A or the charging voltage exceeds 32V, the charging power exceeds the set value (128W). The heat generated by the PTC causes its own temperature to rise and exceed the critical value, thereby causing the positive temperature coefficient thermistor (PTC) to disconnect the charging output terminal (line terminal VBUS), thus providing protection.

[0025] In this embodiment of the application, a first detection pin is provided next to each power supply pin VBUS of the TYPE-C interface. For example, the first detection pin can be one of the four pins A3 (TX1-), A10 (RX2-), B3 (TX2-), and B10 (RX1-).

[0026] The application circuit of the TYPE-C interface also includes a controller (MCU). The controller (MCU) is connected to each of the first detection pins. For example, the first detection pins A3 (TX1-), A10 (RX2-), B3 (TX2-), and B10 (RX1-) are all connected to the MCU's water inlet detection pin (represented as WATER_DET_TX or WATER_DET_RX).

[0027] In one example, such as Figure 1As shown, the first detection pin A3 (TX1-) is connected to the MCU's water ingress detection pin (WATER_DET_TX) through resistor R4; A10 (RX2-) is connected to the MCU's water ingress detection pin (WATER_DET_RX) through resistor R45; B3 (TX2-) is connected to the MCU's water ingress detection pin (WATER_DET_TX) through resistor R8; and B10 (RX1-) is connected to the MCU's water ingress detection pin (WATER_DET_RX) through resistor R106. The resistance values ​​of resistors R4, R45, R8, and R106 are all 200kΩ, with an accuracy class of 5%.

[0028] The controller (MCU) determines the presence of liquid or moisture inside the Type-C interface based on the voltage of the first detection pins (A3, A10, B3, B10). Understandably, when liquid or moisture enters the Type-C interface, the internal resistance between the power supply pin VBUS and the adjacent first detection pin changes from positive infinity (+∞) to tens to hundreds of kiloohms. This decrease in resistance creates a voltage divider between the first detection pin and the power supply pin VBUS, resulting in a voltage on the first detection pin. When the Type-C interface is operating normally, no liquid or moisture enters, and the voltage on the first detection pin is 0V. Therefore, the controller (MCU) can determine the presence of liquid or moisture inside the Type-C interface based on the voltage on the first detection pin. For example, a voltage of 0V indicates no liquid or moisture has entered, while a voltage greater than 0V indicates liquid or moisture has entered. Upon detecting liquid or moisture inside the Type-C interface, the controller (MCU) can shut down the charging function to protect downstream circuitry.

[0029] In the application circuit of this application embodiment, multiple power pins of the TYPE-C interface can be used for external charging, and the first detection pin located next to the power pins can be used to determine whether there is liquid or water vapor inside the TYPE-C interface. Therefore, charging and water ingress detection can be realized without adding additional components. The application circuit is simple and has few components, which can save PCB layout space and is convenient for application in consumer electronic products with small internal space, such as headphones and portable speakers.

[0030] In some embodiments, such as Figure 1As shown, the TYPE-C interface also includes multiple second detection pins. For example, these second detection pins can be A2 (TX1+), A11 (RX2+), B2 (TX2+), and B11 (RX1+). Multiple of these second detection pins are connected to the controller (MCU). For instance, second detection pins A2 (TX1+), A11 (RX2+), B2 (TX2+), and B11 (RX1+) are all connected to the MCU's debug pins (represented as debug pins BT_UART1_TX or BT_UART1_RX).

[0031] The second detection pin is used to output asynchronous serial communication data (UART data) from the controller (MCU). For example, one of the second detection pins, A2 (TX1+), can output UART data through the BT_UART1_RX and BT_UART1_TX ports. Asynchronous serial communication data (UART data) is used to identify error information from the controller (MCU). Therefore, errors (bugs) can be analyzed based on the acquired MCU operating status data, enabling debugging.

[0032] In some embodiments, each second detection pin is located next to a first detection pin. For example, the second detection pin A2 (TX1+) is located next to the first detection pin A3 (TX1-), the second detection pin A11 (RX2+) is located next to the first detection pin A10 (RX2-), the second detection pin B2 (TX2+) is located next to the first detection pin B3 (TX2-), and the second detection pin B11 (RX1+) is located next to the first detection pin B10 (RX1-).

[0033] In some embodiments, the TYPE-C interface also includes multiple data transmission pins. For example, the data transmission pins can be four pins: A6 (D+1), A7 (D-1), B6 ​​(D+2), and B7 (D-2). These multiple data transmission pins are connected to the controller (MCU). For instance, data transmission pins A6 (D+1) and B6 (D+2) are connected via a line to the audio transmission port (D+ port) of the controller (MCU), and data transmission pins A7 (D-1) and B7 (D-2) are connected via a line to the audio transmission port (D- port) of the controller (MCU).

[0034] In some embodiments, the data transmission pin is used to transmit audio signals to achieve audio signal transmission functionality. The controller (MCU) can process the audio signals, such as parsing them, and transmit them to the device's speakers for playback.

[0035] In other embodiments, the data transmission pin is used to transmit software update data (e.g., firmware data) to upgrade the controller (MCU), thereby enabling the controller (MCU) upgrade function.

[0036] In some embodiments, continue to refer to Figure 1 Pins A1 and B12 are connected by a line and then grounded together, which is connected to the external ground GND.

[0037] Pin A5 (CC1) is grounded through resistor R23. In one example, resistor R23 has a resistance of 5.1kΩ and an accuracy class of 1%. Pin B5 (CC2) is grounded through resistor R29. In one example, resistor R29 has a resistance of 5.1kΩ and an accuracy class of 1%.

[0038] Pins A8 (SBU1) and B8 (SBU2) can be left floating or configured as other functional pins according to actual needs.

[0039] After pins A12 and B1 are connected by a line, they are grounded through inductor FB2. In one example, the impedance of inductor FB2 is 120Ω at a frequency of 100MHz. Alternatively, the connection between pins A12 and B1 can also be grounded through a bidirectional Zener diode D4. In one example, the bidirectional Zener diode D4 is model PESDNC2FD24VB.

[0040] Pins 1-6 are connected via a circuit and then grounded through inductor FB5. In one example, inductor FB5 has an impedance of 120Ω at a frequency of 100MHz. Alternatively, the connection point of pins 1-6 can also be grounded through a bidirectional Zener diode D10. In one example, the bidirectional Zener diode D10 is model PESDNC2FD24VB.

[0041] In some embodiments, the current output terminal of the positive temperature coefficient thermistor (FUSH1) can be grounded through a bidirectional Zener diode D9. In one example, the bidirectional Zener diode D9 is model PESDNC2FD24VB.

[0042] In some embodiments, pin B11 (RX1+) can be grounded through bidirectional Zener diode D6, pin B10 (RX1-) can be grounded through bidirectional Zener diode D3, pin B3 (TX2-) can be grounded through bidirectional Zener diode D5, and pin B2 (TX2+) can be grounded through bidirectional Zener diode D7.

[0043] In some embodiments, pin B7 (D-2) can be grounded via a bidirectional Zener diode D12. A resistor R1 is provided between pin B7 (D-2) and the audio transmission port (D-port) of the controller (MCU). In one example, resistor R1 is a zero-ohm resistor with a precision class of 1%.

[0044] Pin B6 (D+2) can be grounded via a bidirectional Zener diode D15. A resistor R2 is provided between pin B6 (D+2) and the audio transmission port (D+ port) of the controller (MCU). In one example, resistor R2 is a zero-ohm resistor with a precision class of 1%.

[0045] In some embodiments, the application circuitry for the TYPE-C interface also includes a negative temperature coefficient thermistor (NTC). The resistance of a negative temperature coefficient thermistor (NTC) decreases as the temperature increases, thus its resistance value can reflect the temperature level.

[0046] The negative temperature coefficient (NTC) thermistor is positioned near the Type-C interface. For example, the NTC can be attached to the surface near the Type-C interface. The NTC is connected to a controller (MCU). The MCU detects the temperature of the Type-C interface based on the voltage across the NTC. When an excessively high temperature is detected, the charging output function can be disconnected to achieve over-temperature protection.

[0047] In some embodiments, reference Figure 2 , Figure 2 This diagram illustrates the connection relationship of the negative temperature coefficient thermistors in the application circuit of the TYPE-C interface according to an embodiment of this application. The controller (MCU) includes a power output pin ( Figure 2 The pins in the diagram represent the MCU_LDO power supply pin (e.g., the MCU_3.3V power output pin) and the detection pin. Figure 2 This is represented as the NTC_DET pin. The power output pin is used to output the supply voltage, for example, 3.3V. The power output pin is connected to one end of a negative temperature coefficient (NTC) thermistor R203 via a voltage divider resistor R3, with the other end of the NTC thermistor R203 grounded. The NTC thermistor R203 is placed near the TYPE-C interface. In one example, the voltage divider resistor R3 has a resistance of 10kΩ and an accuracy class of 1%. In another example, the NTC thermistor R203 is model B:3435, with a reference resistance of 10kΩ and an accuracy class of 1%.

[0048] The controller (MCU) connects its detection pin, NTC_DET, between the voltage divider resistor R3 and the negative temperature coefficient (NTC) thermistor R203. Understandably, when the temperature of the Type-C interface rises, the resistance of the NTC thermistor R203 decreases. Based on the voltage division relationship between the NTC thermistor R203 and the voltage divider resistor R3, the voltage across the NTC thermistor R203 decreases, and the voltage detected by the NTC_DET pin also decreases. Therefore, the controller (MCU) can determine whether there is an abnormally high temperature at the Type-C interface based on the voltage detected by the NTC_DET pin. If an abnormally high temperature is detected, the charging output function can be disconnected to achieve over-temperature protection.

[0049] The TYPE-C interface application circuit of this application embodiment can realize multiple functions such as charging, software upgrade, debugging, audio transmission, water ingress detection and protection, over-temperature protection, over-current protection, and over-voltage protection, which greatly improves the utilization rate of the TYPE-C interface, enables comprehensive monitoring during charging, and improves safety and stability.

[0050] This application also provides an electronic device including the TYPE-C interface application circuit of any of the above embodiments. In practical applications, the electronic device can be a consumer electronic product with a small internal space, such as headphones or portable speakers.

[0051] In the description of this application, it should be understood that terms such as “first” and “second” are used only to distinguish similar objects and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0052] It should be noted that in the embodiments of this application, "connection" can be understood as electrical connection. The connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0053] The application circuits and electronic devices with the TYPE-C interface provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application, and the descriptions of the embodiments above are only for the purpose of helping to understand this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An application circuit with a TYPE-C interface, characterized in that, include: The TYPE-C interface includes multiple power pins, each of which has a first detection pin next to it. The power pins are used for input voltage and are connected to a charging output terminal, which is used for external charging. The controller is connected to each of the first detection pins and is used to determine whether there is liquid or water vapor inside the TYPE-C interface based on the voltage of the first detection pin.

2. The application circuit according to claim 1, characterized in that, The plurality of power supply pins are connected to each other and connected to the charging output terminal through a positive temperature coefficient thermistor. The positive temperature coefficient thermistor disconnects the charging output terminal when the charging current or charging voltage is abnormal.

3. The application circuit according to claim 2, characterized in that, The positive temperature coefficient thermistor has a detection current threshold of 4A and a detection voltage threshold of 32V.

4. The application circuit according to claim 1, characterized in that, There are four power supply pins, which are arranged in a distributed manner.

5. The application circuit according to claim 1, characterized in that, The TYPE-C interface also includes multiple second detection pins connected to the controller. These second detection pins are used to output asynchronous serial communication data from the controller, which is used to identify error information from the controller.

6. The application circuit according to claim 5, characterized in that, Each of the second detection pins is located next to one of the first detection pins.

7. The application circuit according to claim 1, characterized in that, The TYPE-C interface also includes multiple data transmission pins, which are connected to the controller. These data transmission pins are used to transmit audio signals or software update data to upgrade the controller.

8. The application circuit according to any one of claims 1 to 7, characterized in that, It also includes a negative temperature coefficient thermistor, which is positioned close to the TYPE-C interface and connected to the controller. The controller is used to detect the temperature of the TYPE-C interface based on the voltage of the negative temperature coefficient thermistor.

9. The application circuit according to claim 8, characterized in that, The controller includes a power output pin and a detection pin. The power output pin is connected to one end of the negative temperature coefficient thermistor through a voltage divider resistor, and the other end of the negative temperature coefficient thermistor is grounded. The detection pin is connected between the voltage divider resistor and the negative temperature coefficient thermistor.

10. An electronic device, characterized in that, Includes the application circuit described in any one of claims 1 to 9.

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