Docking station core board circuit

Abstract

The utility model relates to the technical field of docking stations, in particular to a docking station core board circuit, which comprises a printed circuit board (PCB), the PCB is provided with a master control circuit, a first sub-control circuit, a second sub-control circuit and a universal serial bus (USB) hub circuit compatible with a universal serial bus (USB) 2.0 standard, and the master control circuit comprises a JHL8440 type control chip supporting a thunder 4 protocol. The control chip supports the Thunderbolt 4 standard, and has the highest data transmission rate of 40Gbps, the double 4K display output capability and the efficient power supply management function. The main control circuit is electrically connected with the first sub-control circuit, the second sub-control circuit and the USB hub circuit. The overall circuit design meets the technical specification of the thunder 4, high-speed data transmission, multi-device expansion and stable compatibility can be achieved, and the urgent requirement of a user for high performance and multiple functions and meeting the standard docking station of the thunder 4 is met.

Description

Technical Field

[0001] This utility model relates to the field of docking station technology, and in particular to a docking station core board circuit. Background Technology

[0002] With the increasing trend towards thinner and lighter modern electronic devices, especially laptops and tablets, the number and variety of interfaces on these devices have significantly decreased, causing considerable inconvenience for users connecting peripherals. To address this issue, docking stations have emerged. A docking station is an external expansion device that provides a host computer with various peripheral interface expansions, such as USB ports, video output, network ports, and power supplies, greatly improving the connectivity and flexibility of electronic devices.

[0003] In recent years, with the continuous improvement of data transmission speed and multi-functional integration requirements, traditional docking stations have become insufficient to meet the needs of high-performance devices. Thunderbolt 4, as the latest generation of high-speed interface standard, integrates high-speed data transmission, video output, and power supply, and is compatible with the USB4 standard, making it an ideal choice for docking station design. The Thunderbolt 4 standard supports data transmission rates up to 40Gbps, supports dual 4K display output, and offers significant improvements in security and compatibility, meeting the needs of future high-performance computing and multimedia applications.

[0004] Therefore, designing a Thunderbolt 4 compliant docking station to meet the growing demands for high-speed data transmission, multi-screen display, and efficient power supply has become a pressing technical challenge. Utility Model Content

[0005] In view of this, this utility model proposes a docking station core board circuit that conforms to the Thunderbolt 4 standard.

[0006] This utility model proposes a docking station core board circuit, including a PCB circuit board. The PCB circuit board is provided with a main control circuit, a first sub-control circuit, a second sub-control circuit, and a USB hub circuit compatible with the USB 2.0 standard. The main control circuit is electrically connected to the first sub-control circuit, the second sub-control circuit, and the USB hub circuit. The main control circuit includes a JHL8440 control chip that supports the Thunderbolt 4 protocol.

[0007] Furthermore, the A13, B13, A11, B11, A7, B7, A9, B9, A21, B21, A19, B19, A15, B15, A17, and B17 pins of the control chip are all connected to resistors and capacitors in sequence.

[0008] Capacitors are connected to the AC3, AB3, AC5, AB5, AC9, AB9, AC7, AB7, AC11, AB11, AC13, AB13, AC17, AB17, AC15, AB15, AC19, and AB19 pins of the control chip.

[0009] The control chip's W22, W23, Y22, and Y23 pins are all connected to resistors;

[0010] The control chip has the following pins: A1, AC2, AC4, AC6, AC8, AC10, AC12, AC14, AC16, AC18, AC20, AC22, AB2, AB4, AB6, AB8, AB10, AB12, AB14, AB16, AB18, AB20, AB22, AA2, AA22, AA23, Y4, Y5, Y6, Y8, Y9, Y11, Y12, Y13, Y15, Y16, Y18, Y19, and Y20. Pins: W5, W18, W19, W20, V22, V5, V6, V8, V9, V11, V12, V13, V15, V16, V18, V19, V20, T6, T8, T9, T11, T12, T15, T16, L22, L23, L4, L5, L19, L20, K1, K2, J5, J6, J13, J15, J19, J20, J22, J23, H1, H2, H4, H5 H9 pin, H11 pin, G22 pin, G23 pin, F4 pin, F5 pin, F6 pin, F8 pin, F9 pin, F11 pin, F12 pin, F13 pin, F15 pin, F16 pin, F20 pin, F22 pin, F23 pin, D22 pin, D6 pin, D8 pin, D9 pin, D11 pin, D12 pin, D13 pin, D15 pin, D16 pin, D18 pin, D19 pin, D20 pin, C22 pin, B6 pin, B8 pin, B10 pin, B12 pin, B14 pin, B16 pin, B18 pin, B20 pin, B22 pin, A6 pin, A8 pin, A10 pin, A12 pin, A1 4-pin, A16-pin, A18-pin, A20-pin, A22-pin, B5-pin, D5-pin, D4-pin, E4-pin, E2-pin, E1-pin, J11-pin, L16-pin, L13-pin, L11-pin, M19-pin, M16-pin, M13-pin, M11-pin, M8-pin, M4-pin, N16-pin, N13-pin, N11-pin, N8-pin, N5-pin, N4-pin, R19-pin, R16-pin, R13-pin, R11-pin, R8-pin, R5-pin, R4-pin, T5-pin, V4-pin, W4-pin, Y2-pin, M5-pin, A5-pin, A23-pin, AC1-pin, AC23-pin, AB23-pin, J4-pin.Both pin AB1 and pin V23 are grounded.

[0011] Furthermore, the first sub-control circuit includes a first MCU chip of type CYPD5235.

[0012] Furthermore, the K2, H2, K9, and K10 pins of the first MCU chip are all grounded through capacitors, and the B9 pin of the first MCU chip is connected to a resistor.

[0013] The first MCU chip has its D5, D6, D7, D8, E4, E5, E6, E7, E8, F4, F5, F6, F7, F8, G4, G5, G6, G7 and H7 pins all grounded.

[0014] Furthermore, the second sub-control circuit includes a second MCU chip of type CY7C65219.

[0015] Furthermore, a resistor is connected to pin 12 of the second MCU chip, and pins 33 and 44 of the second MCU chip are both grounded.

[0016] Furthermore, the USB hub circuit includes a hub chip of type FL5801-2Q2.

[0017] Furthermore, pin 49 of the hub chip is grounded.

[0018] Furthermore, the PCB circuit board is provided with two USB-C interfaces supporting the Thunderbolt 4 protocol. The USB-C interfaces are electrically connected to the main control circuit. One USB-C interface is used for uplink data transmission, and the other USB-C interface is used for downlink data transmission.

[0019] Furthermore, the PCB circuit board is provided with at least one gold finger, which is electrically connected to the main control circuit.

[0020] Compared with existing technologies, the advantages of this utility model are as follows: A docking station core board circuit includes a PCB circuit board, on which a main control circuit, a first sub-control circuit, a second sub-control circuit, and a USB hub circuit compatible with the USB 2.0 standard are disposed. The main control circuit includes a JHL8440 control chip supporting the Thunderbolt 4 protocol. This control chip supports the Thunderbolt 4 standard, has a maximum data transfer rate of 40Gbps, dual 4K display output capability, and efficient power management functions. The main control circuit is electrically connected to the first sub-control circuit, the second sub-control circuit, and the USB hub circuit. The overall circuit design meets the technical specifications of Thunderbolt 4, enabling high-speed data transfer, multi-device expansion, and stable compatibility, thus solving the user's urgent need for a high-performance, multi-functional, and Thunderbolt 4 compliant docking station. Attached Figure Description

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0022] Figure 1 The circuit structure schematic diagram of the expansion dock core board circuit provided in the embodiment of this utility model;

[0023] Figure 2 The circuit structure diagram of the first part of the main control circuit provided in the embodiment of this utility model;

[0024] Figure 3 The second part of the circuit structure diagram of the main control circuit provided in the embodiment of this utility model;

[0025] Figure 4 The circuit structure diagram of the third part of the main control circuit provided in the embodiment of this utility model;

[0026] Figure 5 A circuit structure diagram of the first sub-control circuit provided in an embodiment of this utility model;

[0027] Figure 6 A circuit structure diagram of the second sub-control circuit provided in an embodiment of this utility model;

[0028] Figure 7 The circuit structure diagram of the USB hub circuit provided in the embodiment of this utility model is shown. Detailed Implementation

[0029] The solutions in the embodiments of this utility model 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 utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0030] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0031] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0032] Please refer to Figure 1 As shown, this utility model proposes a docking station core board circuit, including a PCB circuit board. The PCB circuit board is provided with a main control circuit, a first sub-control circuit, a second sub-control circuit, and a USB hub circuit compatible with the USB 2.0 standard. The main control circuit is electrically connected to the first sub-control circuit, the second sub-control circuit, and the USB hub circuit. The main control circuit includes a JHL8440 control chip that supports the Thunderbolt 4 protocol.

[0033] Specifically, the docking station's core board circuitry features two sub-control circuits, primarily designed for efficient management and load sharing of different types of peripherals. For example, the first sub-control circuit can focus on processing video signals or high-bandwidth data streams, while the second sub-control circuit can handle the control and management of other peripherals, such as audio, storage devices, or low-speed interfaces. This effectively reduces the load on the main control circuitry, improving the overall system's stability and response speed. Furthermore, the dual-control circuitry structure enhances the docking station's core board circuitry's flexibility and expandability, facilitating future functional upgrades and support for diverse interfaces, further meeting users' needs for simultaneous connection of multiple devices and high-performance operation.

[0034] Compared with existing technologies, the expansion dock core board circuit proposed in this embodiment uses a control chip that supports the Thunderbolt 4 standard, featuring a data transfer rate of up to 40Gbps, dual 4K display output capability, and efficient power management. The overall circuit design meets the Thunderbolt 4 technical specifications, enabling high-speed data transfer, multi-device expansion, and stable compatibility, thus addressing users' urgent need for a high-performance, multi-functional expansion dock that complies with the Thunderbolt 4 standard.

[0035] In some embodiments of this application, pins A13, B13, A11, B11, A7, B7, A9, B9, A21, B21, A19, B19, A15, B15, A17, and B17 of the control chip are connected to resistors and capacitors in sequence.

[0036] Capacitors are connected to the AC3, AB3, AC5, AB5, AC9, AB9, AC7, AB7, AC11, AB11, AC13, AB13, AC17, AB17, AC15, AB15, AC19, and AB19 pins of the control chip.

[0037] The control chip's W22, W23, Y22, and Y23 pins are all connected to resistors;

[0038] The control chip has the following pins: A1, AC2, AC4, AC6, AC8, AC10, AC12, AC14, AC16, AC18, AC20, AC22, AB2, AB4, AB6, AB8, AB10, AB12, AB14, AB16, AB18, AB20, AB22, AA2, AA22, AA23, Y4, Y5, Y6, Y8, Y9, Y11, Y12, Y13, Y15, Y16, Y18, Y19, and Y20. Pins: W5, W18, W19, W20, V22, V5, V6, V8, V9, V11, V12, V13, V15, V16, V18, V19, V20, T6, T8, T9, T11, T12, T15, T16, L22, L23, L4, L5, L19, L20, K1, K2, J5, J6, J13, J15, J19, J20, J22, J23, H1, H2, H4, H5 H9 pin, H11 pin, G22 pin, G23 pin, F4 pin, F5 pin, F6 pin, F8 pin, F9 pin, F11 pin, F12 pin, F13 pin, F15 pin, F16 pin, F20 pin, F22 pin, F23 pin, D22 pin, D6 pin, D8 pin, D9 pin, D11 pin, D12 pin, D13 pin, D15 pin, D16 pin, D18 pin, D19 pin, D20 pin, C22 pin, B6 pin, B8 pin, B10 pin, B12 pin, B14 pin, B16 pin, B18 pin, B20 pin, B22 pin, A6 pin, A8 pin, A10 pin, A12 pin, A1 4-pin, A16-pin, A18-pin, A20-pin, A22-pin, B5-pin, D5-pin, D4-pin, E4-pin, E2-pin, E1-pin, J11-pin, L16-pin, L13-pin, L11-pin, M19-pin, M16-pin, M13-pin, M11-pin, M8-pin, M4-pin, N16-pin, N13-pin, N11-pin, N8-pin, N5-pin, N4-pin, R19-pin, R16-pin, R13-pin, R11-pin, R8-pin, R5-pin, R4-pin, T5-pin, V4-pin, W4-pin, Y2-pin, M5-pin, A5-pin, A23-pin, AC1-pin, AC23-pin, AB23-pin, J4-pin.Both pin AB1 and pin V23 are grounded.

[0039] For details, please refer to Figure 2-4 As shown, the JHL8440 control chip, as the core component of the main control circuit, supports a bidirectional 40Gbps high-speed transmission rate and is compatible with USB4, PCIe 3.0, and DisplayPort 1.4 protocols. It can drive dual 4K (60Hz) or a single 8K (30Hz) display and supports HDR display effects. Furthermore, this control chip supports daisy-chain topology, allowing up to six devices (including displays) to be connected in series on a single interface, and is backward compatible with Thunderbolt 3, USB 3.2, and DisplayPort devices. It is compatible with Windows and macOS systems, ensuring broad compatibility and powerful expandability. It should be noted that the above description of the control chip's pin connections only covers the connection layout of some pins. For other pin connection structures and related component parameters not mentioned in the text, please refer to the appendix. Figure 2-4 The details will not be elaborated here. Furthermore, the above connection layout is merely an example; in actual applications, other connection schemes can be adopted according to specific needs, which will not be further illustrated here.

[0040] In some embodiments of this application, the first sub-control circuit includes a first MCU chip of type CYPD5235.

[0041] For details, please refer to Figure 5 As shown, the CYPD5235 MCU chip integrates a 32-bit ARM Cortex-M0 processor with a clock speed of 48MHz, equipped with 128KB of flash memory and 12KB of RAM, enabling it to handle complex protocols. It integrates dual USB Type-C interfaces and PD protocol power management, supporting intelligent power distribution and fast charging. This MCU chip also provides rich communication interfaces, such as I2C, SPI, and UART / USART, and can be flexibly configured as a DFP (master), DRP (dual role), or UFP (device) port. It uses a 96-pin BGA package, measuring 6x6 mm, supports surface mounting, and has an operating temperature range of -40℃ to 85℃, meeting industrial-grade environmental requirements.

[0042] In some embodiments of this application, the K2, H2, K9, and K10 pins of the first MCU chip are all grounded through capacitors, and the B9 pin of the first MCU chip is connected to a resistor.

[0043] The first MCU chip has its D5, D6, D7, D8, E4, E5, E6, E7, E8, F4, F5, F6, F7, F8, G4, G5, G6, G7 and H7 pins all grounded.

[0044] Specifically, the above description of the pin connection relationships of the first MCU chip only involves the connection layout of some pins of the first MCU chip. For other pin connection structures and related component parameters not mentioned in the text, please refer to the appendix. Figure 5 The details will not be elaborated here. Furthermore, the above connection layout is merely an example; in actual applications, other connection schemes can be adopted according to specific needs, which will not be further illustrated here.

[0045] In some embodiments of this application, the second sub-control circuit includes a second MCU chip of type CY7C65219.

[0046] For details, please refer to Figure 6 As shown, the CY7C65219 MCU chip also integrates a 32-bit ARM Cortex-M0 processor with a clock speed of 48MHz, supporting USB 2.0 full-speed (12Mbps) data transfer. It is compatible with I2C, SPI, and UART communication interfaces, and features a built-in DMC encryption engine, enabling device authentication, digital signatures, and data encryption to ensure system security. This MCU chip uses a 40-pin QFN package (6x6 mm), supports surface mount design, and operates within a temperature range of -40℃ to 85℃, meeting industrial-grade environmental standards.

[0047] In some embodiments of this application, pin 12 of the second MCU chip is connected to a resistor, and pins 33 and 44 of the second MCU chip are both grounded.

[0048] Specifically, the above description of the pin connections of the second MCU chip only covers the connection layout of some pins of the second MCU chip. For other pin connection structures and related component parameters not mentioned in the text, please refer to the appendix. Figure 6 The details will not be elaborated here. Furthermore, the above connection layout is merely an example; in actual applications, other connection schemes can be adopted according to specific needs, which will not be further illustrated here.

[0049] In some embodiments of this application, the USB hub circuit includes a hub chip of type FL5801-2Q2.

[0050] For details, please refer to Figure 7As shown, the FL5801-2Q2 hub chip is a high-performance USB 2.0 hub chip that supports four downstream ports and is compatible with USB 2.0 high-speed (480Mbps), full-speed (12Mbps), and low-speed (1.5Mbps) transmission protocols. This hub chip integrates overcurrent protection, hot-plug detection, and ESD protection (±8kV contact discharge), improving the stability and safety of the docking station's core board circuitry. It also supports independent port power management, allowing flexible configuration of the on / off state of each port, and is compatible with multiple operating systems, including Windows, Linux, and macOS. The hub chip uses a QFN-32 package (5x5 mm) and operates within a temperature range of -40℃ to +85℃, meeting the demands of harsh environments.

[0051] In some embodiments of this application, pin 49 of the hub chip is grounded.

[0052] Specifically, the above description of the hub chip pin connections only covers the connection layout of some pins of the hub chip. For other pin connection structures and related component parameters not mentioned in the text, please refer to the appendix. Figure 7 The details will not be elaborated here. Furthermore, the above connection layout is merely an example; in actual applications, other connection schemes can be adopted according to specific needs, which will not be further illustrated here.

[0053] In some embodiments of this application, the PCB circuit board is provided with two USB-C interfaces supporting the Thunderbolt 4 protocol. The USB-C interfaces are electrically connected to the main control circuit. One USB-C interface is used for uplink data transmission, and the other USB-C interface is used for downlink data transmission.

[0054] Specifically, one USB-C port is an upstream port (also known as Upstream Port A), which supports connection to a PC host and can simultaneously provide 85W PD fast charging to meet high power requirements; the other USB-C port is a downstream port (also known as Downstream Port B), which has dual-mode expansion capabilities. It supports connecting to a Type-C display for video transmission and is also compatible with USB 10Gbps high-speed peripherals and Thunderbolt Dock devices, achieving full-speed transmission of 40Gbps. At the same time, it provides 5V / 3A (15W) auxiliary power to ensure stable operation of peripherals.

[0055] In some embodiments of this application, the PCB circuit board is provided with at least one gold finger, and the gold finger is electrically connected to the main control circuit.

[0056] Specifically, the gold fingers are electrically connected to the main control circuit, further enriching the interface's expansion capabilities. Specifically, the gold fingers include a Port C interface, a Port D interface, and a Port E interface. Port C and Port D are dual DisplayPort (DP) interfaces, employing DisplayPortAlt Mode technology and supporting 8K ultra-high-definition output up to 7680×4320@30Hz. The Port E interface is equipped with a USB 3.1 Gen2 controller, with a theoretical transmission rate of up to 10Gbps, and can be used to expand high-speed storage devices or connect external docking stations. In conjunction with the aforementioned upstream port PortA and downstream port PortB, the entire docking station core board circuit is compatible with both Thunderbolt 4 and USB 4 protocols, supporting daisy-chain topology connections. A single module can connect multiple Thunderbolt devices in series, achieving a flexible and efficient multi-device connection solution.

[0057] The docking station core board circuit provided in this embodiment of the utility model uses the Intel JHL8440 control chip as its core, adopts an 8-layer PCB stacked design, integrates two Thunderbolt 4 Type-C interfaces and multi-functional gold finger pins, and provides complete Thunderbolt 4 protocol support. (Through I...) 2 The Type-C bus protocol collaboratively manages multiple peripheral chips. With the coordination and scheduling of the JHL8440 control chip, it realizes the protocol conversion and power management strategy optimization of the Type-C interface, and combines with security chips to build a stable hardware environment, thereby effectively improving the ability to connect multiple devices.

[0058] Thunderbolt 4 is a new generation of high-speed, multi-functional digital interface proposed by Intel, supporting data transfer rates of 40Gbps, 8K ultra-high-definition display, and high-power charging up to 100W, meeting the connectivity needs between high-performance signal sources and devices. The docking station core board circuit provided in this embodiment uses the Intel JHL8440 control chip as the main controller for the Thunderbolt 4 core board circuit, and combined with a corresponding baseboard design, can constitute a complete Thunderbolt 4 docking station circuit system.

[0059] It should be noted that the technical solutions of the various embodiments of this utility model can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0060] The above description is only a part or preferred embodiment of this utility model. Neither the text nor the drawings should limit the scope of protection of this utility model. All equivalent structural transformations made using the content of this utility model specification and drawings under the overall concept of this utility model, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.

Claims

1. A core board circuit for a docking station, characterized in that, The device includes a PCB circuit board on which a main control circuit, a first sub-control circuit, a second sub-control circuit, and a USB hub circuit compatible with the USB 2.0 standard are disposed; wherein, the main control circuit is electrically connected to the first sub-control circuit, the second sub-control circuit, and the USB hub circuit, and the main control circuit includes a JHL8440 type control chip that supports the Thunderbolt 4 protocol.

2. The expansion dock core board circuit according to claim 1, characterized in that, The A13, B13, A11, B11, A7, B7, A9, B9, A21, B21, A19, B19, A15, B15, A17 and B17 pins of the control chip are all connected to resistors and capacitors in sequence. Capacitors are connected to the AC3, AB3, AC5, AB5, AC9, AB9, AC7, AB7, AC11, AB11, AC13, AB13, AC17, AB17, AC15, AB15, AC19, and AB19 pins of the control chip. The control chip's W22, W23, Y22, and Y23 pins are all connected to resistors; The control chip has the following pins: A1, AC2, AC4, AC6, AC8, AC10, AC12, AC14, AC16, AC18, AC20, AC22, AB2, AB4, AB6, AB8, AB10, AB12, AB14, AB16, AB18, AB20, AB22, AA2, AA22, AA23, Y4, Y5, Y6, Y8, Y9, Y11, Y12, Y13, Y15, Y16, Y18, Y19, and Y20. Pins: W5, W18, W19, W20, V22, V5, V6, V8, V9, V11, V12, V13, V15, V16, V18, V19, V20, T6, T8, T9, T11, T12, T15, T16, L22, L23, L4, L5, L19, L20, K1, K2, J5, J6, J13, J15, J19, J20, J22, J23, H1, H2, H4, H5 H9 pin, H11 pin, G22 pin, G23 pin, F4 pin, F5 pin, F6 pin, F8 pin, F9 pin, F11 pin, F12 pin, F13 pin, F15 pin, F16 pin, F20 pin, F22 pin, F23 pin, D22 pin, D6 pin, D8 pin, D9 pin, D11 pin, D12 pin, D13 pin, D15 pin, D16 pin, D18 pin, D19 pin, D20 pin, C22 pin, B6 pin, B8 pin, B10 pin, B12 pin, B14 pin, B16 pin, B18 pin, B20 pin, B22 pin, A6 pin, A8 pin, A10 pin, A12 pin, A1 4-pin, A16-pin, A18-pin, A20-pin, A22-pin, B5-pin, D5-pin, D4-pin, E4-pin, E2-pin, E1-pin, J11-pin, L16-pin, L13-pin, L11-pin, M19-pin, M16-pin, M13-pin, M11-pin, M8-pin, M4-pin, N16-pin, N13-pin, N11-pin, N8-pin, N5-pin, N4-pin, R19-pin, R16-pin, R13-pin, R11-pin, R8-pin, R5-pin, R4-pin, T5-pin, V4-pin, W4-pin, Y2-pin, M5-pin, A5-pin, A23-pin, AC1-pin, AC23-pin, AB23-pin, J4-pin.Both pin AB1 and pin V23 are grounded.

3. The expansion dock core board circuit according to claim 1, characterized in that, The first sub-control circuit includes a CYPD5235 type first MCU chip.

4. The expansion dock core board circuit according to claim 3, characterized in that, The K2, H2, K9 and K10 pins of the first MCU chip are all grounded through capacitors, and the B9 pin of the first MCU chip is connected to a resistor. The first MCU chip has its D5, D6, D7, D8, E4, E5, E6, E7, E8, F4, F5, F6, F7, F8, G4, G5, G6, G7 and H7 pins all grounded.

5. The expansion dock core board circuit according to claim 1, characterized in that, The second sub-control circuit includes a second MCU chip of type CY7C65219.

6. The expansion dock core board circuit according to claim 5, characterized in that, A resistor is connected to pin 12 of the second MCU chip, and pins 33 and 44 of the second MCU chip are both grounded.

7. The expansion dock core board circuit according to claim 1, characterized in that, The USB hub circuit includes a hub chip of type FL5801-2Q2.

8. The expansion dock core board circuit according to claim 7, characterized in that, Pin 49 of the hub chip is grounded.

9. The expansion dock core board circuit according to claim 1, characterized in that, The PCB circuit board is equipped with two USB-C ports that support the Thunderbolt 4 protocol. The USB-C ports are electrically connected to the main control circuit. One USB-C port is used for uplink data transmission, and the other USB-C port is used for downlink data transmission.

10. The expansion dock core board circuit according to claim 1, characterized in that, The PCB circuit board is provided with at least one gold finger, and the gold finger is electrically connected to the main control circuit.

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