Type-c interface multiplexing circuit, type-c download cable and TV stick

Abstract

The application relates to a Type-C interface multiplexing circuit, a Type-C download cable and a TV stick. The circuit is based on a Type-C connector structure. The circuit comprises the following: a pin corresponding to a sending end in a first differential signal group of the Type-C connector is used for connecting a download mode trigger button, a pin corresponding to a receiving end in the first differential signal group of the Type-C connector is used for connecting a first USB interface; the first USB interface is activated in a download mode and is used for executing a download task; a pin corresponding to a first standard USB signal of the Type-C connector is used for connecting a second USB interface; the second USB interface is activated in a non-download mode and is used for transmitting multimedia data. The Type-C interface multiplexing circuit provided by the application can realize system download upgrading without disassembling a machine under the condition that only one Type-C interface is left.

Description

Technical Field

[0001] This application relates to the field of electronic design technology, and in particular to a Type-C interface multiplexing circuit, a Type-C download cable, and a TV stick. Background Technology

[0002] With the increasing trend towards miniaturization in electronic products, these products typically require highly integrated and compact designs. However, this miniaturization presents significant challenges to product development and maintenance, particularly in terms of downloading, upgrading, and debugging.

[0003] Traditional solutions often rely on multiple physical interfaces and buttons. For example, a USB 2.0 interface is used for everyday data transfer, a dedicated download interface for system firmware download and upgrades, and an external button triggers entry into specific modes (such as download mode). These interfaces and buttons are independent, each with its own specific function. However, such products require multiple physical interfaces and buttons, which places high demands on product size. For compact products, such as TV sticks or other portable devices, multiple interfaces and buttons would occupy too much space. In existing technologies, when a product has only one external interface, downloading and installation require repeated disassembly and reassembly of the casing to individually solder the download interface and button for firmware upgrades. This not only increases the complexity and difficulty of the operation but also can damage the casing and motherboard during the repeated disassembly and soldering process. Utility Model Content

[0004] In view of the above-mentioned problems of the prior art, this application provides a Type-C interface multiplexing circuit, a Type-C download cable and a TV stick, which can enable system download and upgrade without disassembling the device, while ensuring that only one external Type-C interface is left open.

[0005] To achieve the above objectives, the first aspect of this application provides a Type-C interface multiplexing circuit, characterized in that the circuit is constructed based on a Type-C connector, and the circuit includes: a pin corresponding to the transmitting end in the first differential signal group of the Type-C connector for connecting a download mode trigger button; a pin corresponding to the receiving end in the first differential signal group of the Type-C connector for connecting a first USB interface; the first USB interface is activated in download mode for performing a download task; a pin corresponding to the first standard USB signal of the Type-C connector is used to connect a second USB interface; the second USB interface is activated in non-download mode for transmitting multimedia data.

[0006] Therefore, this invention uses the first standard USB interface of the Type-C connector as the normal multimedia data transmission interface, and transforms the first differential signal group of the Type-C connector into a dedicated data transmission interface and control button for downloading. This allows for both regular data transmission and download upgrade control with only one interface remaining in the product, achieving interface reuse and enabling system download upgrades without disassembling the device.

[0007] As one implementation of this aspect, the pins corresponding to the transmitting end in the first differential signal group of the Type-C connector are used to connect to the download mode trigger button, including: the pins corresponding to the transmitting end in the first differential signal group include a positive pin and a negative pin, the positive pin is used to connect to a high-level signal, and the negative pin is used to connect to the button.

[0008] As one implementation of this aspect, it also includes: the pins corresponding to the second differential signal group of the Type-C connector are used to connect to the JTAG debugging interface of the debugging device.

[0009] As described above, by using the second differential signal group of the Type-C connector as the JTAG debugging interface of the debugging device, debugging of the device can be achieved while only reserving one external interface, thus realizing the effect of one port serving multiple purposes.

[0010] As one implementation of this aspect, it also includes: setting the pins corresponding to the configuration channel used for detecting the cable insertion direction in the Type-C connector to be left floating.

[0011] As described above, by leaving the configuration pins of the Type-C connector floating, the USB cable can be plugged in arbitrarily regardless of the insertion direction, which makes it more convenient for users.

[0012] As one implementation of this aspect, it also includes: the first sideband of the Type-C connector uses the pin corresponding to the signal to connect to the power supply of the debugging device, and the second sideband of the Type-C connector uses the pin corresponding to the signal to be left floating.

[0013] As one implementation of this aspect, it further includes: the pin corresponding to the power signal of the Type-C connector is used to connect to the power supply, and the pin corresponding to the ground signal of the Type-C connector is used to connect to ground.

[0014] As one implementation of this aspect, it further includes: the pin corresponding to the second standard USB signal of the Type-C connector is connected to ground through a voltage suppression diode; the pin corresponding to the first standard USB signal of the Type-C connector is connected to ground through a voltage suppression diode.

[0015] As one implementation of this aspect, the pins corresponding to the receiving end in the first differential signal group of the Type-C connector are connected to ground through a voltage suppression diode; the pins corresponding to the second differential signal group of the Type-C connector are connected to ground through an electrostatic protection device.

[0016] The second aspect of this application provides a Type-C download cable, which is constructed based on a truncated Type-C cable. The download cable includes: the end of the truncated Type-C cable where the Type-C interface is located serves as the Type-C interface of the download cable and is plugged into the second USB interface of the circuit described in any of the first aspects; the other end of the truncated Type-C cable exposes multiple wires, which include three wire groups; in the first wire group: the wire corresponding to the first differential signal receiving end is connected to the USB interface of the external device, the wire corresponding to the power signal is connected to the power supply, and the wire corresponding to the ground signal is connected to the ground terminal; in the second wire group: the wire corresponding to the first differential signal transmitting end is connected to the download mode trigger button; in the third wire group: the wire corresponding to the second differential signal is connected to the JTAG debugging interface of the debugging device, the wire corresponding to the first sideband usage signal is connected to the power supply of the debugging device, and the wire corresponding to the ground signal is connected to the ground terminal.

[0017] The beneficial effects in this regard can also be found in the descriptions of the beneficial effects in the first aspect above.

[0018] A third aspect of this application provides a TV stick, wherein the Type-C function of the TV stick is implemented based on the Type-C interface multiplexing circuit described in any of the first aspects above; the TV stick is disposed in a housing, and the housing is provided with a through hole matching a second USB interface; the second USB interface is used to connect the Type-C download cable described in the second aspect above when there is a download task; the second USB interface is also used to connect a Type-C data cable when there is a data transmission task, wherein the Type-C data cable includes a standard USB signal core, a power core, and a ground core.

[0019] The beneficial effects in this regard can also be found in the descriptions of the beneficial effects in each part of the first aspect above. Attached Figure Description

[0020] The various technical features of this application and their relationships will be further explained below with reference to the accompanying drawings. The drawings are exemplary; some technical features are not shown to scale, and some drawings may omit technical features commonly used in the art to which this application pertains that are not essential for understanding and implementing this application, or additionally show technical features that are not essential for understanding and implementing this application. In other words, the combination of various technical features shown in the drawings is not intended to limit this application. Furthermore, throughout this application, the same reference numerals refer to the same things. Specific descriptions of the drawings are as follows:

[0021] Figure 1 A schematic diagram of a Type-C interface multiplexing circuit provided for an embodiment of this application;

[0022] Figure 2 A stripped-down version of the Type-C cable provided in this application embodiment;

[0023] Figure 3 This application provides a dedicated download cable based on a modified full-version Type-C cable. Detailed Implementation

[0024] The technical solutions provided in this application will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the circuit structures and business scenarios provided in the embodiments of this application are mainly for illustrating possible implementations of the technical solutions of this application and should not be construed as the sole limitation on the technical solutions of this application. Those skilled in the art will recognize that, with the evolution of circuit structures and the emergence of new business scenarios, the technical solutions provided in this application are equally applicable to similar technical problems.

[0025] It should be understood that this application provides a Type-C interface multiplexing solution, including: a Type-C interface multiplexing circuit, a Type-C download cable, and a TV stick. Since these technical solutions solve problems based on the same or similar principles, some repetitive details may not be repeated in the following descriptions of specific embodiments. However, it should be considered that these specific embodiments have mutual references and can be combined with each other.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. In case of any inconsistency, the meaning set forth in this specification or derived from the content described herein shall prevail. Furthermore, the terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit the scope of this application.

[0027] In order to accurately describe the technical content of this application and to accurately understand the present invention, the following explanations or definitions of the terms used in this specification are given before describing the specific embodiments:

[0028] 1) Complete wiring of Type-C connector (full version): Generally, a complete Type-C connector includes 24 connecting wires, each corresponding to a connecting pin. Specifically, it includes power pins VUS1-VUS4 (4 pins), configuration channel pins CC1 and CC2 (2 pins) for detecting cable insertion direction, sideband signal pins SBU1 and SBU2 (2 pins), ground pins GND1-GND4 (4 pins), two sets of differential signal pairs pins SSTXP1, SSTXN1, SSRXP1, SSRXN1, SSTXP2, SSTXN2, SSRXP2, SSRXN2 (8 pins), and two sets of standard USB signals DP1, DN1, DP2, DN2 (4 pins).

[0029] 2) Simplified wiring of Type-C connector (crippled version): Generally, the crippled version of the Type-C connector includes 4 connecting wires, specifically including one power connection wire VBUS, one ground connection wire GND, one positive wire DP for standard USB signal, and one negative wire DM for standard USB signal.

[0030] The Type-C interface multiplexing circuit provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0031] like Figure 1 As shown, this circuit is constructed based on the Type-C connector J101. This Type-C connector includes power pins VUS1-VUS4, configuration channel pins CC1 and CC2, sideband signal pins SBU1 and SBU2, ground pins GND1-GND4, ground pins GND_E1-GND_E4, first differential signal group pins SSTXP1, SSTXN1, SSRXP1, SSRXN1, pins DP1 and DN1 corresponding to the first standard USB signal, pins DP2 and DN2 corresponding to the second standard USB signal, and second differential signal group pins SSRXN1, SSTXP2, SSTXN2, SSRXP2, SSRXN2. The connection method of these pins, constructed in this embodiment to achieve Type-C interface multiplexing, will be described in detail below.

[0032] In the first differential signal group of the Type-C connector, the pin corresponding to the transmitting end is used to connect the download mode trigger button. See details below. Figure 1In the first differential signal group, the positive pin SSTXP1 corresponding to the transmitting end is used to connect to the 1.8V high-level signal VIO18, and the negative pin SSTXN1 corresponding to the transmitting end is used to connect to the button. The button signal is... Figure 1 The Boot button is used to trigger the download mode. For example, pressing this button activates the Boot signal by connecting it to the 1.8V high level of SSTXP1, thus putting the system into download mode to perform download tasks. The pins corresponding to the receiver in the first differential signal group of the Type-C connector are used to connect to the first USB interface. See also... Figure 1 In the first differential signal group, the positive pin SSRXP1 corresponding to the receiving end is used to connect to the positive terminal USB0_DP of the first USB interface, and the negative pin SSRXN1 corresponding to the receiving end is used to connect to the negative terminal USB0_DM of the first USB interface. In this embodiment, to prevent signal interference, the signal line corresponding to SSRXP1 can be connected to ground via a voltage suppression diode TVS104, and the signal line corresponding to SSRXN1 can be connected to ground via a voltage suppression diode TVS103.

[0033] The pin corresponding to the first standard USB signal on the Type-C connector is used to connect to the second USB interface. See below. Figure 1 The positive pin DP2 corresponding to the first standard USB signal is used to connect to the second USB interface USB1_DP, and the negative pin DN2 corresponding to the first standard USB signal is used to connect to the second USB interface USB1_DM. This second USB interface is activated in non-download mode and is used to transmit multimedia data. In this embodiment, the signal line corresponding to DP2 can also be connected to ground through a voltage suppression diode TVS101, and the signal line corresponding to DN2 can be connected to ground through a voltage suppression diode TVS102.

[0034] To save space, the pins DP1 and DN1 corresponding to the second USB signal of the Type-C connector are not brought out as external interfaces. Therefore, in this application, the pins DP1 and DN1 corresponding to the standard second USB signal are connected to ground through voltage suppression diodes. That is, the signal line DP1 corresponding to the second USB signal is connected to ground through voltage suppression diode TVS101, and the signal line DN1 corresponding to the second USB signal is connected to ground through voltage suppression diode TVS102.

[0035] The pins corresponding to the second differential signal group of the Type-C connector are used to connect to the JTAG debug interface of debugging devices (such as ARM emulators). See [link / reference]. Figure 1In the second differential signal group, the positive pin SSTXP2 corresponding to the transmitting end is used to connect to the mode selection signal MTMS0 of the debugging device. The mode selection signal MTMS0 is used to control the switching of the JTAG state machine, such as the running state and the debugging state. The negative pin SSTXN2 corresponding to the transmitting end of the second differential signal group is used to connect to the clock signal MTCK0 of the debugging device. The clock signal MTCK0 is used to synchronize the system clock and realize synchronous data transmission. The positive pin SSRXP2 corresponding to the receiving end of the second differential signal group is used to connect to the input signal MTDI0 of the debugging device. The input signal MTDI0 is used to receive external control commands or data from the outside. The negative pin SSRXN2 corresponding to the receiving end of the second differential signal group is used to connect to the output signal MTDO0 of the debugging device. The output signal MTDO0 is used to output the internal state of the system. In the second differential signal group of this embodiment, the signal lines corresponding to SSTXP2, SSTXN2, SSRXP2, and SSRXN2 are connected to ground after passing through electrostatic discharge (ESD) protection devices. Specifically, SSTXP2 is connected to ground after passing through ESD104, SSTXN2 is connected to ground after passing through ESD103, SSRXP2 is connected to ground after passing through ESD102, and SSRXN2 is connected to ground after passing through ESD105.

[0036] In this embodiment, in order to adapt to OTG cables, the pins CC1 and CC2 corresponding to the configuration channel used to detect the cable insertion direction in the Type-C connector are left floating, so that the insertion direction does not need to be considered when inserting the USB cable.

[0037] The first sideband of the Type-C connector uses pin SBU1, corresponding to the signal, to connect to the power supply VCC_3V3_OUT of the debugging device, providing 3.3V power to the debugging device through VCC_3V3_OUT. The second sideband of the Type-C connector uses pin SBU2, corresponding to the signal, which is left floating.

[0038] The power signal pins VBUS1-VBUS4 of the Type-C connector are used to connect to the power supply. In this embodiment, the power supply is connected to VBUS1-VBUS4 of the Type-C connector through two capacitors C103 and C102 connected in parallel, then through a bidirectional trigger diode. This power supply is also connected to ground through an electrostatic discharge (ESD) protection device ESD101. The ground signal pins of the Type-C connector are used to connect to the ground terminal, such as... Figure 1 As shown, the ground terminals of this Type-C connector include two sets. The first set is signal ground GND1-GND4, which is used to ground the signal lines; the second set is power ground GND_E1-GND_E4, which is used to ground the power supply.

[0039] In this embodiment Figure 1 It can be seen that it also includes Hole1-Hole2, which are physical holes on the circuit board corresponding to the Type-C connector, used to fix the circuit board corresponding to the Type-C connector.

[0040] Based on the above pin connection relationship of the Type-C connector, by using Figure 2 The stripped-down Type-C cable (VBUS / GND / DM / DP) shown is used to achieve data communication in normal mode. Specifically, power is supplied through VBUS and GND. By connecting the USB1 2.0 signals (USB1_DP and USB1_DM) to the 2.0 signal pins (DP2 and DN2) of the Type-C connector, data communication can be achieved through the USB1 2.0 interface (USB1_DP and USB1_DM) in normal mode.

[0041] When downloading is required, the full-size Type-C cable (24 wires) can be converted into a dedicated download cable. See [link / reference]. Figure 3 Specifically, the 24-wire Type-C cable is cut short. A high-level signal VIO18 is externally connected to the SSTXP1 core corresponding to the first differential signal transmitter, and a button is externally connected to the SSTXN1 core corresponding to the first differential signal transmitter. This allows entry into download mode to be triggered by the external button. Simultaneously, data transmission is achieved through the SSRXP1 and SSRXN1 cores corresponding to the first differential signal receiver, thus completing the download and upgrade tasks. By connecting the pins of the SBU1 core corresponding to the first sideband signal and the SSTXP2, SSTXN2, SSRXP2, and SSRXN2 cores corresponding to the second differential signal transmitter to an external ARM emulator, debugging and simulation functions can also be implemented.

[0042] This embodiment also provides a Type-C download cable, such as Figure 3As shown, this Type-C download cable is constructed based on a truncated full-length Type-C cable (including 24 wires). In this download cable: the Type-C interface end of the truncated Type-C cable is plugged into the aforementioned Type-C connector as the Type-C interface of the download cable. It should be understood that since this Type-C connector only has one USB1 interface, one end of the download cable is plugged into the USB1 of the Type-C connector. However, as the cable performing the download task, controlled by the download trigger button, its corresponding wire core is actually connected to the first differential signal group, not the first standard USB signal group. The other end of the truncated Type-C cable exposes multiple wire cores, which are divided into three wire core groups. In the first core group: the cores SSRXP1 and SSRXN1 corresponding to the receiving end of the first differential signal group, the core VBUS corresponding to the power signal, and the core GND corresponding to the ground signal are all connected to the USB interface of the external device (e.g., the USB Type-A of the external computer that provides download data); in the second core group: the cores SSTXP1 and SSTXN1 corresponding to the transmitting end of the first differential signal are connected to the download trigger button, specifically, core SSTXP1 is connected to the high-level signal VIO18, and core SSTXN1 is connected to the signal Boot; in the third core group: the cores (SSTXP2, SSTXN2, SSRXP2, SSRXN2) corresponding to the second differential signal are connected to the JTAG debugging interface (MTMS0, MTCK0, MTDI0, MTDO0) of the debugging device, the core corresponding to the first sideband use signal SUB1 is connected to the power supply VCC_3V3_OUT of the debugging device, the core corresponding to the ground signal GND is connected to the ground GND, and the core SSTXP1 corresponding to the transmitting end of the first differential signal is connected to the high-level signal VIO18.

[0043] By combining the modified download cable described above with the Type-C interface multiplexing circuit provided in this application embodiment, ordinary data transmission and downloading can be achieved with only one external interface.

[0044] This embodiment also provides a TV stick, whose Type-C function is implemented through the Type-C interface multiplexing circuit provided in the above embodiment. The TV stick is housed within a casing, which has a through-hole that matches the second USB interface of the Type-C connector. Under normal circumstances, the second USB interface can achieve ordinary data transmission through an external, modified Type-C cable. When a download task is required, the second USB interface can activate the download mode, transmit download data, and perform simulation and debugging by connecting the modified download cable described above, thus facilitating download tasks while retaining only one external interface.

[0045] Note that the above are merely preferred embodiments and the technical principles employed in this application. Those skilled in the art will understand that this application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of this application, all of which fall within the scope of protection of this application.

Claims

1. A Type-C interface multiplexing circuit, characterized in that, The circuit is constructed based on a Type-C connector and includes: The pins corresponding to the transmitting end in the first differential signal group of the Type-C connector are used to connect to the download mode trigger button, and the pins corresponding to the receiving end in the first differential signal group of the Type-C connector are used to connect to the first USB interface; the first USB interface is activated in download mode to perform download tasks. The pin corresponding to the first standard USB signal of the Type-C connector is used to connect to the second USB interface; the second USB interface is activated in non-download mode for transmitting multimedia data.

2. The circuit according to claim 1, characterized in that, The pins corresponding to the transmitting end in the first differential signal group of the Type-C connector are used to connect to the download mode trigger button, including: The pins corresponding to the transmitting end in the first differential signal group include positive pins and negative pins. The positive pins are used to connect to a high-level signal, and the negative pins are used to connect to the button.

3. The circuit according to claim 1, characterized in that, Also includes: The pins corresponding to the second differential signal group of the Type-C connector are used to connect to the JTAG debugging interface of the debugging device.

4. The circuit according to claim 1, characterized in that, Also includes: The pins corresponding to the configuration channel used to detect the cable insertion direction in the Type-C connector are left floating.

5. The circuit according to claim 1, characterized in that, Also includes: The first sideband of the Type-C connector uses the pin corresponding to the signal to connect to the power supply of the debugging equipment, while the second sideband of the Type-C connector uses the pin corresponding to the signal to be left floating.

6. The circuit according to claim 1, characterized in that, Also includes: The pin corresponding to the power signal of the Type-C connector is used to connect to the power supply, and the pin corresponding to the ground signal of the Type-C connector is used to connect to ground.

7. The circuit according to claim 1, characterized in that, Also includes: The pin corresponding to the second standard USB signal of the Type-C connector is connected to ground via a voltage suppression diode. The pin corresponding to the first standard USB signal of the Type-C connector is connected to ground via a voltage suppression diode.

8. The circuit according to claim 3, characterized in that, In the first differential signal group of the Type-C connector, the pin corresponding to the receiving end is connected to ground through a voltage suppression diode; The pins corresponding to the second differential signal group of the Type-C connector are connected to ground after passing through an electrostatic protection device.

9. A Type-C download cable, characterized in that, The Type-C download cable is constructed based on a truncated Type-C cable, and the download cable includes: The Type-C interface end of the cut-off Type-C cable is plugged into the second USB interface of the circuit according to any one of claims 1-8 as the Type-C interface of the download cable; the other end of the cut-off Type-C cable exposes multiple wire cores, the multiple wire cores including three wire core groups; In the first core group: the core corresponding to the first differential signal receiver is connected to the USB interface of the external device, the core corresponding to the power signal is connected to the power supply, and the core corresponding to the ground signal is connected to the ground. In the second core group: the core corresponding to the first differential signal transmitter is connected to the download mode trigger button; In the third core group: the core corresponding to the second differential signal is connected to the JTAG debugging interface of the debugging equipment, the core corresponding to the first sideband signal is connected to the power supply of the debugging equipment, and the core corresponding to the ground signal is connected to the ground terminal.

10. A TV stick, characterized in that, The Type-C function of the TV stick is implemented based on the Type-C interface multiplexing circuit described in any one of claims 1-8; The TV stick is disposed within a housing, the housing having a through hole matching the second USB interface; the second USB interface is used to connect the Type-C download cable of claim 9 when there is a download task; the second USB interface is also used to connect a Type-C data cable when there is a data transmission task, the Type-C data cable including a standard USB signal core, a power core, and a ground core.

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