A TYPE-C analog earphone recognition circuit

Abstract

The utility model provides a TYPE-C analog earphone identification circuit, which is used in conjunction with an earphone or a USB device, and comprises: an SB sound card for outputting left and right channel signals of an analog earphone, a mainboard for outputting a USB signal, a YPE-C connector for connecting to the earphone or the USB device, an audio switch for conducting the left and right channel signals of the analog earphone or conducting the USB signal, and a controller, wherein after the TYPE-C connector is connected to the earphone, the earphone outputs a low-level identification signal to the TYPE-C connector, and after the TYPE-C connector is connected to the USB device, the USB device outputs a high-level identification signal to the TYPE-C connector; the controller controls the real-time switching of the audio switch according to the high and low level signals output by the connected USB sound card or the USB device, so as to conduct the left and right channel signals of the analog earphone or conduct the USB signal, thereby enabling the earphone or the USB device to work, and the switching is simple, thereby reducing the production cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of earphones, and in particular relates to a TYPE-C analog earphone identification circuit. Background Art

[0002] With the development of technology, in order to facilitate the unification of IO interfaces, the TYPE-C interface has gradually replaced other interfaces and is used in devices such as laptops. The traditional 3.5mm headphone interface has been cancelled on mobile phones and other devices. Although it is still widely used on laptops, it needs to be compatible with the TYPE-C interface.

[0003] In the prior art, TYPE-C headphones have a built-in sound card chip, and the motherboard only needs to transmit audio data through USB signals. However, the function is single and cannot be connected to different devices. Connecting to different devices also requires adding access ports, which increases the design difficulty and the production cost.

[0004] Based on the above reasons, it is urgent to design a TYPE-C analog headset recognition circuit that solves the above problems. Utility Model Content

[0005] The utility model aims to overcome the above-mentioned deficiencies of the prior art and provide a TYPE-C analog earphone recognition circuit which switches in real time according to the high and low level signals connected.

[0006] The utility model is implemented as follows: a TYPE-C analog earphone identification circuit, used in conjunction with an earphone or a USB device, comprises:

[0007] A USB sound card, used for outputting left and right channel signals of analog headphones, and having a power switch, through which the USB sound card is controlled to output or turn off the left and right channel signals of analog headphones;

[0008] Mainboard, used to output USB signals;

[0009] A TYPE-C connector, used to connect to a headset or a USB device. After the TYPE-C connector is connected to the headset, the headset outputs a low-level identification signal to the TYPE-C connector. After the TYPE-C connector is connected to the USB device, the USB device outputs a high-level identification signal to the TYPE-C connector.

[0010] An audio switch, used to conduct the left and right channel signals of analog headphones, or to conduct the USB signal;

[0011] A controller, configured to detect a low-level identification signal or a high-level identification signal output by the TYPE-C connector. When the TYPE-C connector outputs a low-level identification signal, the controller outputs a high-level signal to turn on the power switch and control the audio switch to turn on the left and right channel signals of the analog headphone output by the USB sound card; or

[0012] When the TYPE-C connector outputs a high-level identification signal, the controller outputs a low-level signal for turning off the power switch and controlling the audio switch to turn on the USB signal.

[0013] Preferably, the USB sound card comprises a HPOUTR pin for outputting a left channel signal to the audio switch and a HPOUTL pin for outputting a right channel signal.

[0014] Preferably, the audio switch comprises:

[0015] An R pin connected to the HPOUTR pin to receive a left channel signal, and an L pin connected to the HPOUTL pin to receive a right channel signal;

[0016] An N-pin and an N+ pin respectively connected to two output terminals of the mainboard to receive the USB signal;

[0017] A D+ / R pin and a D- / L pin respectively connected to two input ends of the TYPE-C connector;

[0018] ALP_SCL pin connected to the output end of the controller for conducting left and right channel signals of analog headphones or USB signals;

[0019] A VCC pin and a VBUS pin are used to be connected to a power source, a voltage-stabilizing resistor is provided between the VBUS pin and the power source, a coupling capacitor is connected to the node between the voltage-stabilizing resistor and the power source, and the coupling capacitor is grounded.

[0020] Furthermore, left and right sound channels of headphones are connected between the USB sound card and the audio switch, and the left and right sound channels of the headphones include: at least four first capacitors, two of which are arranged in parallel, wherein a node where one end of two of the first capacitors are connected to each other forms a first input pin connected to the HPOUTL pin of the USB sound card, and a node where the other ends are connected to each other forms a first output pin connected to the R pin of the audio switch;

[0021] A node where one end of the other two first capacitors are connected to each other forms a second input pin connected to the HPOUTR pin of the USB sound card, and a node where the other ends are connected to each other forms a second output pin connected to the L pin of the audio switch.

[0022] Preferably, the controller includes a control chip, and the control chip includes:

[0023] A VDD pin, used to be connected to a power supply, a node between the VDD pin and the power supply is connected to one end of a second capacitor, and the other end of the second capacitor is grounded;

[0024] The PB2 pin is used to connect to the EN pin of the power switch to control the power switch to be turned on or off;

[0025] The PA3 pin and the PA5 pin are used to connect to the ALP_SCL pin of the audio switch to simulate the left and right channel signals of the headphone or the USB signal to turn on or off;

[0026] A PA2 pin is used to connect to a first interface of a high-level identification signal output by the TYPE-C connector;

[0027] The PA4 pin is used to connect to the second interface of the low-level identification signal output by the TYPE-C connector.

[0028] Furthermore, the controller further includes:

[0029] A first MOS transistor is used to pull down the high-level identification signal output by the TYPE-C connector to output a low-level control signal, the gate of the first MOS transistor is used to be connected to a power supply, the drain of the first MOS transistor is used to be connected to a first interface of the TYPE-C connector that outputs a high-level identification signal, and the source of the first MOS transistor is used to be connected to the PA2 pin.

[0030] Furthermore, the controller also includes: a second MOS tube, used to pull up the low-level identification signal output by the TYPE-C connector to output a high-level control signal, the gate of the second MOS tube is used to be connected to a power supply, the drain of the second MOS tube is used to be connected to a second interface of the TYPE-C connector that outputs a low-level identification signal, and the source of the second MOS tube is used to be connected to the PA4 pin.

[0031] Preferably, the power switch comprises a switch chip, and the switch chip comprises:

[0032] The EN pin is used to connect to the PB2 pin of the controller to receive a control signal output by the controller to turn off or turn on the USB sound card;

[0033] IN pin, used to connect to the power supply;

[0034] OUT pin, used for digital power connection;

[0035] A resistor is connected to a node between the EN pin and the PB2 pin of the controller, and the resistor is grounded;

[0036] A third capacitor and a fourth capacitor are connected in parallel at a node between the OUT pin and the digital power supply, and the third capacitor and the fourth capacitor are grounded.

[0037] Preferably, there are two power switches, one of which is used to control the on / off of a first power supply of the USB sound card, and the other of which is used to control the on / off of a second power supply of the USB sound card.

[0038] The utility model provides a TYPE-C analog earphone identification circuit, which is used in conjunction with an earphone or a USB device, and comprises: an SB sound card for outputting left and right channel signals of the analog earphone, a mainboard for outputting USB signals, a YPE-C connector for connecting to the earphone or the USB device, an audio switch for conducting the left and right channel signals of the analog earphone or conducting the USB signal, and a controller, wherein after the TYPE-C connector is connected to the earphone, the earphone outputs a low-level identification signal to the TYPE-C connector, and after the TYPE-C connector is connected to the USB device, the USB device outputs a high-level identification signal to the TYPE-C connector; the controller controls the real-time switching of the audio switch according to the high and low level signals output by the connected USB sound card or the USB device, so as to conduct the left and right channel signals of the analog earphone or conduct the USB signal, thereby enabling the earphone or the USB device to work, and the switching is simple, thereby reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solution of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 It is a block diagram of a TYPE-C analog headset identification circuit provided by an embodiment of the utility model.

[0041] Figure 2 The present invention is a circuit diagram of a USB sound card in a TYPE-C analog headset identification circuit provided by an embodiment of the present invention.

[0042] Figure 3The utility model provides a circuit schematic diagram of a power switch of a USB sound card in a TYPE-C analog headset identification circuit.

[0043] Figure 4 It is a circuit schematic diagram of an audio switch in a TYPE-C analog headset identification circuit provided in an embodiment of the utility model.

[0044] Figure 5 It is a circuit principle diagram of left and right channels of headphones in a TYPE-C analog headphone identification circuit provided by an embodiment of the utility model.

[0045] Figure 6 It is a circuit schematic diagram of a controller in a TYPE-C analog headset identification circuit provided in an embodiment of the utility model.

[0046] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0047] In the present invention, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or state relationships based on the positions or state relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific position, or to be constructed and operated in a specific position.

[0048] In addition, some of the above terms may be used to express other meanings in addition to indicating a position or state relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0049] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0050] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components, which may be the same or different in specific types and configurations, and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0051] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0052] Overview of TYPE-C analog headset recognition circuit as an example

[0053] like Figure 1 As shown, a TYPE-C analog headset recognition circuit provided by an embodiment of the utility model is used in conjunction with a headset or a USB device (not shown), including:

[0054] The USB sound card 100 is used to output analog headphone left and right channel signals, and has a power switch 110. The power switch 110 is used to control the USB sound card 100 to output or turn off the analog headphone left and right channel signals, wherein the analog headphone left and right channel signals include a left channel signal and a right channel signal;

[0055] Main board 200, used for outputting USB signals;

[0056] A TYPE-C connector 300, used to connect to an earphone or a USB device. After the TYPE-C connector 300 is connected to the earphone, the earphone outputs a low-level identification signal to the TYPE-C connector. After the TYPE-C connector 300 is connected to the USB device, the USB device outputs a high-level identification signal to the TYPE-C connector.

[0057] The audio switch 400 is used to conduct the left and right channel signals of the analog headset, or to conduct the USB signal;

[0058] The controller 500 is used to detect a low-level identification signal or a high-level identification signal output by the TYPE-C connector 300. When the TYPE-C connector 300 outputs a low-level identification signal, the controller 500 outputs a high-level signal to turn on the power switch 110 and control the audio switch 400 to turn on the analog headphone left and right channel signals output by the USB sound card 100; or

[0059] When the TYPE-C connector 300 outputs a high-level identification signal, the controller 500 outputs a low-level signal for turning off the power switch 110 and controlling the audio switch 400 to turn on the USB signal.

[0060] The utility model provides a TYPE-C analog earphone identification circuit, wherein a controller 500 controls an audio switch 400 to switch in real time according to high and low level signals output by a connected USB sound card 100 or a USB device, so as to conduct left and right channel signals of the analog earphone or conduct USB signals, thereby enabling the earphone or the USB device to work, and the switching is simple, thereby reducing the production cost.

[0061] Overview of USB Sound Card as an Example

[0062] like Figure 2 and Figure 3 As shown, preferably, the USB sound card 100 includes a HPOUTR pin for outputting a left channel signal (CC1 signal) and a HPOUTL pin for outputting a right channel signal (CC2 signal) to the audio switch.

[0063] Preferably, the power switch 110 includes a switch chip, and the switch chip includes:

[0064] An EN pin, used to be connected to the PB2 pin of the controller 500 to receive a control signal output by the controller 500 to turn off or turn on the USB sound card 100;

[0065] IN pin, used to connect to a power source, which is preferably a 3.3V power source;

[0066] OUT pin, used for digital power connection, the digital power is preferably V33REG digital power;

[0067] A resistor RG13 is connected to the node between the EN pin and the PB2 pin of the controller, and the resistor RG13 is grounded; the resistor RG13 makes the EN pin in a low level state when there is no signal input, to prevent false triggering caused by interference on the line.

[0068] A third capacitor CG6 and a fourth capacitor CG7 are connected in parallel at a node between the OUT pin and the V33REG digital power supply. The third capacitor CG6 and the fourth capacitor CG7 are grounded, and the third capacitor CG6 and the fourth capacitor CG7 play a filtering role.

[0069] Preferably, there are two power switches 110, one of which is used to control the on / off of the first power supply of the USB sound card 100. In this embodiment, the first power supply is preferably a 3.3V power supply, and the other power switch 110 is used to control the on / off of the second power supply of the USB sound card 100. The USB sound card is controlled by two power switches 110, which has strong stability. In this embodiment, the second power supply is preferably a 5V power supply.

[0070] Audio Switch Overview as an Example

[0071] Preferably, the audio switch 400 comprises:

[0072] An R pin connected to the HPOUTR pin to receive a left channel signal, and an L pin connected to the HPOUTL pin to receive a right channel signal;

[0073] An N-pin and an N+ pin respectively connected to two output terminals of the mainboard 200 to receive the USB signal;

[0074] A D+ / R pin and a D- / L pin respectively connected to two input ends of the TYPE-C connector 300;

[0075] ALP_SCL pin connected to the output end of the controller 500 for conducting left and right channel signals of analog headphones or USB signals;

[0076] A VCC pin and a VBUS pin are used to be connected to a power supply. A voltage-stabilizing resistor R3 is provided between the VBUS pin and the power supply. The voltage-stabilizing resistor R3 plays a role in voltage stabilization. A coupling capacitor C3 is connected to the node between the voltage-stabilizing resistor R3 and the power supply. The coupling capacitor C3 is grounded.

[0077] Overview of left and right channels for headphones as an example

[0078] Further, a headphone left and right sound channels 600 are connected between the USB sound card 100 and the audio switch 400, and the headphone left and right sound channels 600 include: at least four first capacitors (C11, C12, C13, C14), two of which are arranged in parallel, wherein a node at which one end of two of the first capacitors (C11, C12) are connected to each other forms a first input pin connected to the HPOUTL pin of the USB sound card 100, and a node at which the other ends of the two first capacitors (C11, C12) are connected to each other forms a first output pin connected to the R pin of the audio switch 400;

[0079] A node at which one ends of the other two first capacitors (C13, C14) are connected to each other forms a second input pin connected to the HPOUTR pin of the USB sound card 100, and a node at which the other ends of the two first capacitors (C13, C14) are connected to each other forms a second output pin connected to the L pin of the audio switch 400.

[0080] Controller overview as an example

[0081] Preferably, the controller 500 includes a control chip, and the control chip includes:

[0082] A VDD pin, used to be connected to a power supply, a node between the VDD pin and the power supply is connected to one end of a second capacitor CG3, the other end of the second capacitor CG3 is grounded, and the second capacitor CG3 plays a filtering role;

[0083] A PB2 pin, used to be connected to an EN pin of the power switch 110, and used to control the power switch 110 to be turned on or off;

[0084] The PA3 pin and the PA5 pin are used to connect to the ALP_SCL pin of the audio switch 400 to simulate the left and right channel signals of the headphone or the USB signal to turn on or off;

[0085] A PA2 pin is used to connect to a first interface of a high-level identification signal output by the TYPE-C connector 300;

[0086] The PA4 pin is used to connect to the second interface of the low-level identification signal output by the TYPE-C connector.

[0087] Furthermore, the controller 500 further includes:

[0088] The first MOS transistor QA2 is used to pull down the high-level identification signal output by the TYPE-C connector 300 to output a low-level control signal. The gate G of the first MOS transistor QA2 is used to be connected to a power supply. The drain D of the first MOS transistor QA2 is used to be connected to a first interface of the TYPE-C connector 300 that outputs a high-level identification signal. The source S of the first MOS transistor QA2 is used to be connected to the PA2 pin of the control chip.

[0089] Furthermore, the controller 500 also includes: a second MOS transistor QA1, which is used to pull up the low-level identification signal output by the TYPE-C connector 300 to output a high-level control signal, the gate G of the second MOS transistor QA1 is used to be connected to a power supply, the drain D of the second MOS transistor QA1 is used to be connected to a second interface of the TYPE-C connector 300 that outputs a low-level identification signal, and the source S of the second MOS transistor QA1 is used to be connected to the PA4 pin of the control chip.

[0090] The second MOS transistor QA1 and the second MOS transistor QA2 play an isolation protection role to prevent the voltage in the external CC1 signal / CC2 signal from being higher than the rated level of the control chip when the TYPE-C connector 300 is connected, thereby preventing the chip from being damaged.

[0091] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the protection scope of the present invention.

Claims

1. A TYPE-C analog headset recognition circuit, used in conjunction with a headset or a USB device, characterized in that: include: A USB sound card, used for outputting left and right channel signals of analog headphones, and having a power switch, through which the USB sound card is controlled to output or turn off the left and right channel signals of analog headphones; Mainboard, used to output USB signals; A TYPE-C connector, used to connect to a headset or a USB device. After the TYPE-C connector is connected to the headset, the headset outputs a low-level identification signal to the TYPE-C connector. After the TYPE-C connector is connected to the USB device, the USB device outputs a high-level identification signal to the TYPE-C connector. An audio switch, used to conduct the left and right channel signals of analog headphones, or to conduct the USB signal; A controller, configured to detect a low-level identification signal or a high-level identification signal output by the TYPE-C connector. When the TYPE-C connector outputs a low-level identification signal, the controller outputs a high-level signal to turn on the power switch and control the audio switch to turn on the left and right channel signals of the analog headphone output by the USB sound card; or When the TYPE-C connector outputs a high-level identification signal, the controller outputs a low-level signal for turning off the power switch and controlling the audio switch to turn on the USB signal.

2. A TYPE-C analog headset recognition circuit according to claim 1, characterized in that: The USB sound card includes a HPOUTR pin for outputting a left channel signal to the audio switch and a HPOUTL pin for outputting a right channel signal.

3. A TYPE-C analog headset recognition circuit according to claim 2, characterized in that: The audio switch comprises: An R pin connected to the HPOUTR pin to receive a left channel signal, and an L pin connected to the HPOUTL pin to receive a right channel signal; An N-pin and an N+ pin respectively connected to two output terminals of the mainboard to receive the USB signal; A D+ / R pin and a D- / L pin respectively connected to two input ends of the TYPE-C connector; ALP_SCL pin connected to the output end of the controller for conducting left and right channel signals of analog headphones or USB signals; A VCC pin and a VBUS pin are used to be connected to a power source, a voltage-stabilizing resistor is provided between the VBUS pin and the power source, a coupling capacitor is connected to the node between the voltage-stabilizing resistor and the power source, and the coupling capacitor is grounded.

4. A TYPE-C analog headset recognition circuit according to claim 3, characterized in that: The left and right sound channels of the earphones are connected between the USB sound card and the audio switch, and the left and right sound channels of the earphones include: at least four first capacitors, two of which are arranged in parallel, wherein a node where one end of two of the first capacitors are connected to each other forms a first input pin connected to the HPOUTL pin of the USB sound card, and a node where the other ends are connected to each other forms a first output pin connected to the R pin of the audio switch; A node where one end of the other two first capacitors are connected to each other forms a second input pin connected to the HPOUTR pin of the USB sound card, and a node where the other ends are connected to each other forms a second output pin connected to the L pin of the audio switch.

5. A TYPE-C analog headset recognition circuit according to claim 4, characterized in that: The controller includes a control chip, and the control chip includes: A VDD pin, used to be connected to a power supply, a node between the VDD pin and the power supply is connected to one end of a second capacitor, and the other end of the second capacitor is grounded; The PB2 pin is used to connect to the EN pin of the power switch to control the power switch to be turned on or off; The PA3 pin and the PA5 pin are used to connect to the ALP_SCL pin of the audio switch to simulate the left and right channel signals of the headphone or the USB signal to turn on or off; A PA2 pin is used to connect to a first interface of a high-level identification signal output by the TYPE-C connector; The PA4 pin is used to connect to the second interface of the low-level identification signal output by the TYPE-C connector.

6. A TYPE-C analog headset recognition circuit according to claim 5, characterized in that: The controller further comprises: A first MOS transistor is used to pull down the high-level identification signal output by the TYPE-C connector to output a low-level control signal, the gate of the first MOS transistor is used to be connected to a power supply, the drain of the first MOS transistor is used to be connected to a first interface of the TYPE-C connector that outputs a high-level identification signal, and the source of the first MOS transistor is used to be connected to the PA2 pin.

7. A TYPE-C analog headset recognition circuit according to claim 5, characterized in that: The controller further comprises: A second MOS tube is used to pull up the low-level identification signal output by the TYPE-C connector to output a high-level control signal, the gate of the second MOS tube is used to be connected to a power supply, the drain of the second MOS tube is used to be connected to a second interface of the TYPE-C connector that outputs a low-level identification signal, and the source of the second MOS tube is used to be connected to the PA4 pin.

8. A TYPE-C analog headset recognition circuit according to claim 1, characterized in that: The power switch includes a switch chip, and the switch chip includes: The EN pin is used to connect to the PB2 pin of the controller to receive a control signal output by the controller to turn off or turn on the USB sound card; IN pin, used to connect to the power supply; OUT pin, used for digital power connection; A resistor is connected to a node between the EN pin and the PB2 pin of the controller, and the resistor is grounded; A third capacitor and a fourth capacitor are connected in parallel at a node between the OUT pin and the digital power supply, and the third capacitor and the fourth capacitor are grounded.

9. A TYPE-C analog headset recognition circuit according to claim 8, characterized in that: There are two power switches, one of which is used to control the on and off of the first power supply of the USB sound card, and the other of which is used to control the on and off of the second power supply of the USB sound card.

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