Multifunctional USB data line circuit

Abstract

The utility model discloses a multifunctional USB (universal serial bus) data line circuit, which relates to the technical field of data lines and comprises a card reader chip, a USB Type A chip, a USB Type C chip, a USB Type Micro B chip, a mode switching circuit and an indicator lamp circuit. The USB Type A chip, the USB Type C chip and the USB Type Micro B chip are connected between the card reader chip and the mode switching circuit; the indicating lamp circuit is electrically connected with the USB Type A chip, the USB Type C chip, the USB Type Micro B chip and the mode switching circuit respectively. The portable data line has the beneficial effects that the portability of the data line is ensured, and the user experience feeling is optimized.

Description

Technical Field

[0001] The utility model relates to the technical field of data lines, and more specifically to a multifunctional USB data line circuit. Background Art

[0002] There are two common mainstream USB2.0 data cables: the first is USB Type A to USB Micro B, which is mainly used to charge Micro B devices or transfer data between Micro B devices and computers. The second is USB Type A to USB Type C, which is mainly used to charge Type C devices or transfer data between Type C devices and computers.

[0003] In addition, card readers are widely used in computers, mobile phones and other devices, and their interfaces include USB Type C and USB Type A.

[0004] Data cables and card readers are commonly used electronic products and are indispensable main tool electronic products. However, traditional data cables do not have card reader functions, and card readers do not have traditional data cable functions. The two are independent products and are not convenient to carry. In addition, existing data cables with card reader functions mainly use manual switching functions, which are prone to misoperation and cannot achieve fully intelligent switching. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, the utility model provides a multifunctional USB data cable circuit, which effectively solves the problem that the traditional card reader and the data cable are inconvenient to carry due to the independent existence of the traditional card reader and the data cable and the existing data cable with card reader function is not intelligent enough, thereby ensuring the portability of the data cable and optimizing the user experience.

[0006] The technical solution adopted by the utility model to solve the technical problem is: a multifunctional USB data line circuit, the improvement of which lies in that the multifunctional USB data line circuit comprises a card reader chip, a USB Type A chip, a USB Type C chip, a USB Type Micro B chip, a mode switching circuit and an indicator light circuit; the USB Type A chip, the USB Type C chip and the USB Type Micro B chip are connected between the card reader chip and the mode switching circuit; the indicator light circuit is electrically connected to the USB Type A chip, the USB Type C chip, the USB Type Micro B chip and the mode switching circuit respectively;

[0007] The mode switching circuit includes a MOS tube Q3, a transistor Q4 and a transistor Q5; the source of the MOS tube is electrically connected to the base of the transistor Q5, the gate is electrically connected to the collector of the transistor Q4, the drain is connected to a 5V power supply and is electrically connected to a USB Type A chip and a USB Type Micro B chip; the emitter of the transistor Q4 is electrically connected to the USB Type A chip, the base is grounded and is electrically connected to a USB Type C chip and a USB Type Micro B chip; the collector of the transistor Q5 is electrically connected to the USB Type C chip and the USB Type Micro B chip, and the emitter is electrically connected to the USB Type A chip.

[0008] In the above structure, the mode switching circuit further includes a resistor R19, a resistor R20, a resistor R21, a resistor R22, a resistor R30, a capacitor C17 and a capacitor C31; the resistor R19 is connected between the gate of the MOS tube and the collector of the transistor Q4; one end of the resistor R20 is electrically connected to the gate of the MOS tube Q3, and the other end is grounded; the resistor R21 is connected between the source of the MOS tube Q3 and the base of the transistor Q5; one end of the resistor R22 is connected to the base of the transistor Q5, and the other end is grounded; the resistor R30 is connected between the USB Type C chip, the USB Type Micro B chip, and the collector of the transistor Q5; one end of the capacitor C17 is connected to the source of the MOS tube Q3, and the other end is grounded; one end of the capacitor C31 is connected to the drain of the MOS tube Q3, and the other end is grounded.

[0009] In the above structure, the indicator light circuit includes a resistor R2, a resistor R31, a resistor R32, a light-emitting diode D1, a light-emitting diode D3, a light-emitting diode D4 and a voltage-stabilizing diode D2; the resistor R2 is connected between the anode of the light-emitting diode D1 and the anode of the voltage-stabilizing diode; the resistor R31 is connected between the anode of the light-emitting diode D3 and the cathode of the voltage-stabilizing diode D2; the resistor R32 is connected between the source of the MOS tube Q3; and the cathodes of the light-emitting diode D1, the light-emitting diode D3 and the light-emitting diode D4 are all grounded.

[0010] In the above structure, the multifunctional USB data line circuit also includes a first voltage stabilizing circuit, which includes a voltage stabilizing chip, a capacitor C2, a capacitor C5 and an inductor L2; the voltage stabilizing chip includes a VOUT pin, a VIN pin and a GND pin; the positive electrode of the capacitor C2 is connected to the VIN pin and the source of the MOS tube, and the negative electrode is grounded; the inductor L2 is connected between the VOUT pin and the card reader chip.

[0011] In the above structure, the multifunctional USB data line circuit also includes a second voltage stabilizing circuit, which includes resistors R8, R9, R10 and R11, and one end of the resistors R8, R9, R10 and R11 are connected to the card reader chip, and the other end is grounded.

[0012] In the above structure, the multifunctional USB data line circuit also includes a current stabilization circuit, which includes a current stabilization chip and a capacitor C4. The current stabilization chip includes an SCL pin, a GND pin, an SDA pin, a VCC pin and a WP pin, wherein the VCC pin, the SCL pin and the SDA pin are all connected to the card reader chip, and the GND pin and the WP pin are both grounded; the capacitor C4 is connected between the VCC pin and the WP pin.

[0013] In the above structure, the multifunctional USB data line circuit also includes an SD socket circuit, which includes an SD socket, a resistor R1 and a capacitor C1; the SD socket includes an SD DAT2 pin, an SD DAT3 pin, an SD CMD pin, a VDD pin, an SD CLK pin, a VSS pin, an SD DAT1 pin, an SD DAT0 pin and a CDZ pin, wherein the SD DAT2 pin, the SD DAT3 pin, the SD CMD pin, the SD CLK pin, the SD DAT1 pin and the SD DAT0 pin are all connected to the card reader chip, the VDD pin and the VSS pin are respectively connected to the two ends of the capacitor C1, and the VSS pin is grounded, and the CDZ pin is connected to one end of the resistor R1 and the card reader chip; the other end of the resistor R1 is connected to the card reader chip and grounded.

[0014] In the above structure, the model of the card reader chip is GL823-QFN24.

[0015] In the above structure, the model of the voltage stabilizing chip is EMP8733.

[0016] In the above structure, the model of the current stabilizing chip is AT24CS02.

[0017] The beneficial effects of the utility model are as follows: the scheme integrates a card reader chip, a USB Type A chip, a USB Type C chip and a USB Type Micro B chip into the same circuit structure, so that the circuit has both a card reader function and a data line function; a mode switching circuit switches a plurality of working modes of the data line, and an indicator light circuit indicates the working mode of the data line, so as to realize intelligent switching of the working mode of the data line, thereby ensuring the portability of the data line and optimizing the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an overall circuit connection diagram of a multifunctional USB data line circuit of the utility model;

[0019] Figure 2 It is a schematic diagram of a mode switching circuit of a multifunctional USB data line circuit of the utility model;

[0020] Figure 3 It is a schematic diagram of a card reader chip of a multifunctional USB data line circuit of the utility model;

[0021] Figure 4 A schematic diagram of a USB Type A chip of a multifunctional USB data line circuit of the utility model;

[0022] Figure 5 A schematic diagram of a USB Type Micro B chip of a multifunctional USB data line circuit of the utility model;

[0023] Figure 6 A schematic diagram of a USB Type C chip of a multifunctional USB data line circuit of the utility model;

[0024] Figure 7 It is a schematic diagram of a first voltage stabilizing circuit of a multifunctional USB data line circuit of the utility model;

[0025] Figure 8 It is a schematic diagram of a second voltage stabilizing circuit of a multifunctional USB data line circuit of the utility model;

[0026] Fig. 9 It is a schematic diagram of a rectifier circuit of a multifunctional USB data line circuit of the utility model;

[0027] Fig.10 The utility model is a schematic diagram of an SD socket circuit of a multifunctional USB data line circuit. DETAILED DESCRIPTION

[0028] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0029] The following will clearly and completely describe the concept, specific structure and technical effects of the utility model in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the utility model. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the creation of the utility model can be combined interchangeably without conflicting with each other.

[0030] Reference Figure 1 As shown, the utility model discloses a multifunctional USB data line circuit, which includes a card reader chip, a USB Type A chip, a USB Type C chip, a USB Type Micro B chip, a mode switching circuit and an indicator light circuit; the USB Type A chip, the USB Type C chip and the USB Type Micro B chip are connected between the card reader chip and the mode switching circuit; the indicator light circuit is electrically connected to the USB Type A chip, the USB Type C chip, the USB Type Micro B chip and the mode switching circuit respectively; the model of the card reader chip is GL823-QFN24.

[0031] In this embodiment, the multifunctional USB data line circuit includes a card reader chip, a USB Type A chip, a USB Type C chip, a USB Type Micro B chip, a mode switching circuit and an indicator light circuit, wherein the card reader chip is connected to the USB Type A chip, the USB Type C chip and the USB Type Micro B chip for data transmission and power supply; the mode switching circuit is connected to the USB Type A chip, the USB Type C chip and the USB Type Micro B chip for detecting the connection status of the USB Type A chip, the USB Type C chip and the USB Type Micro B chip to switch the working mode of the data line; the indicator light circuit detects the output state of the mode switching circuit and indicates the corresponding working mode; when the utility model is specifically implemented, the multifunctional USB data line circuit integrates the card reader chip, the USB Type A chip, the USB Type C chip and the USB Type Micro B chip in the same circuit structure, so that the circuit has both the card reader function and the data line function; the data line is switched to multiple working modes through the mode switching circuit, and the working mode of the data line is indicated by the indicator light circuit to realize intelligent switching of the working mode of the data line, thereby ensuring the portability of the data line and optimizing the user experience.

[0032] Reference Figure 2As shown, the mode switching circuit includes a MOS tube Q3, a transistor Q4, a transistor Q5, a resistor R19, a resistor R20, a resistor R21, a resistor R22, a resistor R30, a capacitor C17 and a capacitor C31; the source of the MOS tube is electrically connected to the base of the transistor Q5, the gate is electrically connected to the collector of the transistor Q4, the drain is connected to a 5V power supply and is electrically connected to a USB Type A chip and a USB Type Micro B chip; the emitter of the transistor Q4 is electrically connected to the USB Type A chip, the base is grounded and is electrically connected to a USB Type C chip and a USB Type Micro B chip; the collector of the transistor Q5 is electrically connected to the USB Type C chip and the USB Type Micro B chip, and the emitter is connected to the USB Type A chip is electrically connected; the resistor R19 is connected between the gate of the MOS tube and the collector of the transistor Q4; one end of the resistor R20 is electrically connected to the gate of the MOS tube Q3, and the other end is grounded; the resistor R21 is connected between the source of the MOS tube Q3 and the base of the transistor Q5; one end of the resistor R22 is connected to the base of the transistor Q5, and the other end is grounded; the resistor R30 is connected between the USB Type C chip, the USB TypeMicro B chip, and the collector of the transistor Q5; one end of the capacitor C17 is connected to the source of the MOS tube Q3, and the other end is grounded; one end of the capacitor C31 is connected to the drain of the MOS tube Q3, and the other end is grounded; refer to Figure 6 As shown, the indicator light circuit includes a resistor R2, a resistor R31, a resistor R32, a light emitting diode D1, a light emitting diode D3, a light emitting diode D4 and a voltage stabilizing diode D2; the resistor R2 is connected between the anode of the light emitting diode D1 and the anode of the voltage stabilizing diode; the resistor R31 is connected between the anode of the light emitting diode D3 and the cathode of the voltage stabilizing diode D2; the resistor R32 is connected between the source of the MOS tube Q3; the cathodes of the light emitting diode D1, the light emitting diode D3 and the light emitting diode D4 are all grounded.

[0033] In this embodiment, refer to Figure 3-6As shown, the card reader chip is provided with 24 pins, the USB Type A chip is provided with 4 pins, the USB Type C chip is provided with 28 pins, and the USB Type Micro B chip is provided with 7 pins, wherein the DM pin of the card reader chip is connected to the D- pin of the USB Type A chip, the DN1 pin of the USB Type C chip, and the D- pin of the USB Type Micro B chip; the DP pin of the card reader chip is connected to the D+ pin of the USB Type A chip, the DP1 pin of the USB Type C chip, and the D+ pin of the USB Type Micro B chip; the VCC pin of the USB Type A chip is connected to the anode of the voltage-stabilizing diode, and the GND pin is grounded; the GND pin of the USB Type Micro B chip is connected to the base of the transistor Q4, the OGTID pin is connected to the collector of the transistor Q5, and the VCC pin is connected to the drain of the MOS tube Q3; the USB Type The CC1 pin of the C chip is connected to the resistor R30, and the GND pin is connected to the base of the transistor Q4. Through this circuit connection method, when the utility model is specifically implemented, the multifunctional USB data line circuit can realize the switching of four working modes of the data line, wherein working mode one: USB Type A charges USB Type C (or USB Type Micro B), at this time, the card reader does not work, the collector of the transistor Q5 is disconnected from the resistor R30, and the light-emitting diode D1 is lit, the light-emitting diode D3 is lit, and the light-emitting diode D4 is not lit; working mode two: USB Type A transmits data to USB Type C (or USB Type Micro B), at this time, the card reader does not work, the collector of the transistor Q5 is disconnected from the resistor R30, and the light-emitting diode D1 is lit, the light-emitting diode D3 is lit, and the light-emitting diode D4 is not lit; working mode three: USB Type C (or USB Type Micro B) is disconnected, USB Type A transmits data with the card reader. At this time, the card reader works, the collector of the transistor Q5 is connected to the resistor R30 (or short-circuited to the ground), and the light-emitting diode D1 is lit, the light-emitting diode D3 is lit, and the light-emitting diode D4 is lit; Working mode four: USB Type C (or USB Type Micro B) is disconnected, USB Type A transmits data with the card reader. At this time, the card reader works, the collector of the transistor Q5 is connected to the resistor R30 (or short-circuited to the ground), and the light-emitting diode D1 is not lit, the light-emitting diode D3 is lit, and the light-emitting diode D4 is lit.

[0034] Specifically, working mode 1 and working mode 2: USB Type A is connected to the device, the VCC terminal voltage of USB Type A is 5V, USB Type C (or USB Type Micro B) is also connected to the device, the base of transistor Q4 is short-circuited with the GND pin of USB Type C and the GND pin of USB Type Micro B and grounded, the collector and emitter of transistor Q4 are turned on; the gate level of MOS tube Q3 is: R20 / (R19+R20)*5, the drain and source of MOS tube Q3 are disconnected, the source is the card reader power supply, there is no voltage, the card reader does not work, then the light-emitting diode D4 indicating that the card reader is working is not bright, and the voltage of the VCC terminal of USB Type A, the VCC terminal of USB Type Micro B and the cathode of the voltage regulator diode are all 5V, then the light-emitting diode D1 and the light-emitting diode D3 are lit, because the light-emitting diode D4 has no voltage, the base of transistor Q5 is pulled down to a low level by resistor R22, the collector and emitter of transistor Q5 are disconnected, the CC1 pin of USB Type C and the CC1 pin of USB Type Micro B are connected to the CC1 pin of USB Type Micro B, and the CC1 pin of USB Type Micro B are connected to the CC1 pin of USB Type Micro B. The OTGID pins of USB Type C (or USB Type Micro B) are both suspended, and the USB Type C (or USB Type Micro B) end switches to the mode of charging and data transmission with the USB Type A end; among them, working mode one and working mode two depend on whether the USB Type A end is connected to a power source or a device. When a device is connected, working mode one is entered. If a device is connected, charging and data transmission can be performed at the same time (working mode two); working mode three: USB Type A is connected to a device, the VCC terminal voltage of USB Type A is 5V, USB Type C (or USB Type Micro B) is not connected to a device, the base of transistor Q4 is disconnected from the GND pin of USB Type C and the GND pin of USB Type Micro B, and the base of transistor Q4 is suspended, and the collector and emitter of transistor Q4 are disconnected; the gate of MOS tube Q3 is pulled down to a low level by resistor R20, the drain and source of MOS tube Q3 are turned on, the source of MOS tube Q3 is the card reader power supply, the voltage is 5V, the card reader works, and the light-emitting diode D4 indicating that the card reader works lights up, the VCC terminal of USB Type A, USB Type The voltage of Micro's VCC terminal and the cathode of the voltage-stabilizing diode are both 5V, then LED D1 and LED D3 light up;Because the voltage of light-emitting diode D4 is 5V, the base of transistor Q5 is pulled up to a high level, the collector and emitter of transistor Q5 are turned on, the CC1 end of USB Type C is pulled down to the ground through resistor R30, or the OTGID pin of USB Type Micro B is short-circuited to the ground, and the USB Type C (or USB Type Micro B) end switches to OTG mode. USB Type A is the main device by default, USB Type A powers the card reader, and transmits data normally; Working mode four: USB Type A is not connected to the device, and the VCC pin of USB Type A is suspended; USB Type C (or USB Type Micro B) is connected to the device, the base of transistor Q4 is connected to the GND pin of USB Type C and the GND pin of USB Type Micro The GND pin of USB Type B is short-circuited, and the base of transistor Q4 is suspended, the collector and emitter of transistor Q4 are disconnected, the gate of MOS tube Q3 is pulled down to a low level by resistor R20, the drain and source of MOS tube Q3 are turned on, the source of MOS tube Q3 is the power supply of the card reader, the voltage is 5V, the card reader works, and the LED D4 indicating that the card reader works is lit. The voltage of the VCC end of USB Type Micro B and the cathode of the voltage-stabilizing diode is 5V, then the LED D3 is lit, and the VCC end of USB Type A is suspended, then the LED D1 is not lit, because the voltage of LED D4 is 5V, the base of transistor Q5 is pulled up to a high level, the collector and emitter of transistor Q5 are turned on, the CC1 end of USB Type C is pulled down to the ground through resistor R30, or the OTGID end of USB Type Micro B is short-circuited to the ground, the USB Type C (or USB Type Micro B) end switches to OTG mode, powers the card reader, and transmits data normally. ;

[0035] Reference Figure 7 As shown, the multifunctional USB data line circuit also includes a first voltage stabilizing circuit, which includes a voltage stabilizing chip, a capacitor C2, a capacitor C5 and an inductor L2; the voltage stabilizing chip includes a VOUT pin, a VIN pin and a GND pin; the positive electrode of the capacitor C2 is connected to the VIN pin and the source of the MOS tube, and the negative electrode is grounded; the inductor L2 is connected between the VOUT pin and the card reader chip; the model of the voltage stabilizing chip is EMP8733.

[0036] In this embodiment, the first voltage stabilizing circuit includes a voltage stabilizing chip, a capacitor C2, a capacitor C5 and an inductor L2, wherein the voltage stabilizing chip is used to stabilize the output of the circuit voltage; the capacitor C2 and the capacitor C5 can provide charge storage and smooth voltage fluctuations in the circuit; the inductor L2 plays the role of current limiting, filtering and voltage stabilization in the circuit, which helps to reduce voltage fluctuations and noise in the circuit; in the specific implementation of the utility model, when the input voltage enters the voltage stabilizing chip through the capacitor C2, the voltage stabilizing chip will adjust the output voltage according to the designed parameters and feedback mechanism, the inductor L2 helps to stabilize the output voltage and reduce the noise in the circuit through the filter effect, and the voltage stabilizing chip ensures that the output voltage remains stable within a certain range through its internal circuit to supply the stable voltage required by the subsequent circuit (such as the card reader chip).

[0037] Reference Figure 8 As shown, the multifunctional USB data line circuit also includes a second voltage stabilizing circuit, which includes resistors R8, R9, R10 and R11. One ends of the resistors R8, R9, R10 and R11 are connected to the card reader chip, and the other ends are grounded.

[0038] In this embodiment, the second voltage stabilizing circuit includes resistors R8, R9, R10 and R11, wherein the existence of resistors R8, R9, R10 and R11 can adjust the voltage or current of the card reader chip to ensure that the card reader chip obtains appropriate voltage and current, thereby ensuring that the card reader chip obtains a stable power supply.

[0039] Reference Fig. 9 As shown, the multifunctional USB data line circuit also includes a current stabilization circuit, which includes a current stabilization chip and a capacitor C4. The current stabilization chip includes an SCL pin, a GND pin, an SDA pin, a VCC pin, and a WP pin, wherein the VCC pin, the SCL pin, and the SDA pin are all connected to the card reader chip, and the GND pin and the WP pin are both grounded; the capacitor C4 is connected between the VCC pin and the WP pin; the model of the current stabilization chip is AT24CS02. In this embodiment, the current stabilization circuit includes a current stabilization chip and a capacitor C4, wherein the current stabilization chip (AT24CS02) monitors and adjusts the current through its internal circuit and control logic to ensure that it is maintained at a stable level; the capacitor C4 is used to provide additional charge storage and voltage smoothing to help the current stabilization circuit work more efficiently.

[0040] Reference Fig.10As shown, the multifunctional USB data line circuit also includes an SD socket circuit, which includes an SD socket, a resistor R1 and a capacitor C1; the SD socket includes an SD DAT2 pin, an SD DAT3 pin, an SD CMD pin, a VDD pin, an SD CLK pin, a VSS pin, an SD DAT1 pin, an SD DAT0 pin and a CDZ pin, wherein the SD DAT2 pin, the SD DAT3 pin, the SD CMD pin, the SD CLK pin, the SD DAT1 pin and the SD DAT0 pin are all connected to the card reader chip, the VDD pin and the VSS pin are respectively connected to the two ends of the capacitor C1, and the VSS pin is grounded, and the CDZ pin is connected to one end of the resistor R1 and the card reader chip; the other end of the resistor R1 is connected to the card reader chip and grounded. In this embodiment, the SD socket circuit is used to connect the memory card of the device to the USB data line circuit to realize the data reading and writing function; specifically, the SD socket circuit includes an SD socket, a resistor R1 and a capacitor C1, and the SD socket includes an SD DAT2 pin, an SD DAT3 pin, an SD CMD pin, a VDD pin, an SD CLK pin, a VSS pin, an SD DAT1 pin, an SD DAT0 pin and a CDZ pin. The SDDAT2 pin, the SD DAT3 pin, the SD CMD pin, the SD CLK pin, the SD DAT1 pin and the SD DAT0 pin of the SD socket are connected to the card reader chip for controlling and transmitting data; the VDD pin and the VSS pin of the SD socket are connected to both ends of the capacitor C1, the VSS pin is connected to the ground, and the VDD pin is connected to the positive power supply, so as to ensure the stable power supply of the SD socket circuit; the CDZ pin of the SD socket is connected to one end of the resistor R1 and to the card reader chip, and is used to detect the insertion status of the SD card.

[0041] The above is a specific description of the preferred implementation of the utility model, but the invention of the utility model is not limited to the described embodiments. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the utility model. These equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A multifunctional USB data line circuit, characterized in that: The multifunctional USB data line circuit comprises a card reader chip, a USB Type A chip, a USB Type C chip, a USB Type Micro B chip, a mode switching circuit and an indicator light circuit; the USB Type A chip, the USB Type C chip and the USB Type Micro B chip are connected between the card reader chip and the mode switching circuit; the indicator light circuit is electrically connected to the USB Type A chip, the USB Type C chip, the USB Type Micro B chip and the mode switching circuit respectively; The mode switching circuit includes a MOS tube Q3, a transistor Q4 and a transistor Q5; the source of the MOS tube is electrically connected to the base of the transistor Q5, the gate is electrically connected to the collector of the transistor Q4, the drain is connected to a 5V power supply and is electrically connected to a USB Type A chip and a USB Type Micro B chip; the emitter of the transistor Q4 is electrically connected to the USB Type A chip, the base is grounded and is electrically connected to a USB Type C chip and a USB Type Micro B chip; the collector of the transistor Q5 is electrically connected to the USB Type C chip and the USB Type Micro B chip, and the emitter is electrically connected to the USB Type A chip.

2. A multifunctional USB data line circuit according to claim 1, characterized in that: The mode switching circuit also includes a resistor R19, a resistor R20, a resistor R21, a resistor R22, a resistor R30, a capacitor C17 and a capacitor C31; the resistor R19 is connected between the gate of the MOS tube and the collector of the transistor Q4; one end of the resistor R20 is electrically connected to the gate of the MOS tube Q3, and the other end is grounded; the resistor R21 is connected between the source of the MOS tube Q3 and the base of the transistor Q5; one end of the resistor R22 is connected to the base of the transistor Q5, and the other end is grounded; the resistor R30 is connected between the USB Type C chip, the USB Type Micro B chip, and the collector of the transistor Q5; one end of the capacitor C17 is connected to the source of the MOS tube Q3, and the other end is grounded; one end of the capacitor C31 is connected to the drain of the MOS tube Q3, and the other end is grounded.

3. A multifunctional USB data line circuit according to claim 1, characterized in that: The indicator light circuit includes a resistor R2, a resistor R31, a resistor R32, a light-emitting diode D1, a light-emitting diode D3, a light-emitting diode D4 and a voltage-stabilizing diode D2; the resistor R2 is connected between the anode of the light-emitting diode D1 and the anode of the voltage-stabilizing diode; the resistor R31 is connected between the anode of the light-emitting diode D3 and the cathode of the voltage-stabilizing diode D2; the resistor R32 is connected between the source of the MOS tube Q3; the cathodes of the light-emitting diode D1, the light-emitting diode D3 and the light-emitting diode D4 are all grounded.

4. The multifunctional USB data line circuit according to claim 1, characterized in that: The multifunctional USB data line circuit also includes a first voltage stabilizing circuit, which includes a voltage stabilizing chip, a capacitor C2, a capacitor C5 and an inductor L2; the voltage stabilizing chip includes a VOUT pin, a VIN pin and a GND pin; the positive electrode of the capacitor C2 is connected to the VIN pin and the source of the MOS tube, and the negative electrode is grounded; the inductor L2 is connected between the VOUT pin and the card reader chip.

5. The multifunctional USB data line circuit according to claim 1, characterized in that: The multifunctional USB data line circuit also includes a second voltage stabilizing circuit, which includes resistors R8, R9, R10 and R11. One ends of the resistors R8, R9, R10 and R11 are connected to the card reader chip, and the other ends are grounded.

6. The multifunctional USB data line circuit according to claim 1, characterized in that: The multifunctional USB data line circuit also includes a current stabilization circuit, which includes a current stabilization chip and a capacitor C4. The current stabilization chip includes an SCL pin, a GND pin, an SDA pin, a VCC pin and a WP pin, wherein the VCC pin, the SCL pin and the SDA pin are all connected to the card reader chip, and the GND pin and the WP pin are both grounded; the capacitor C4 is connected between the VCC pin and the WP pin.

7. The multifunctional USB data line circuit according to claim 1, characterized in that: The multifunctional USB data line circuit also includes an SD socket circuit, which includes an SD socket, a resistor R1 and a capacitor C1; the SD socket includes an SD DAT2 pin, an SD DAT3 pin, an SD CMD pin, a VDD pin, an SD CLK pin, a VSS pin, an SD DAT1 pin, an SD DAT0 pin and a CDZ pin, wherein: SD DAT2 pin, SD DAT3 pin, SD CMD pin, SD CLK pin, SDDAT1 pin and SD DAT0 pin are all connected to the card reader chip, VDD pin and VSS pin are respectively connected to the two ends of capacitor C1, and VSS pin is grounded, CDZ pin is connected to one end of resistor R1 and the card reader chip; the other end of the resistor R1 is connected to the card reader chip and grounded.

8. The multifunctional USB data line circuit according to claim 1, characterized in that: The model of the card reader chip is GL823-QFN24.

9. The multifunctional USB data line circuit according to claim 4, characterized in that: The model of the voltage regulator chip is EMP8733.

10. The multifunctional USB data line circuit according to claim 6, characterized in that: The model of the current stabilizing chip is AT24CS02.

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