阅读说明：本技术 数据传输电缆及相关设备 (Data transmission cable and related equipment ) 是由 范尚宾 马朋伟 陈超 龚涛 王洪利 于 2020-05-14 设计创作，主要内容包括：本申请公开了一种数据传输电缆及相关设备,该数据传输线缆包括：信号线束,所述信号线束包括至少三个信号线,所述至少三个信号线间隔设置并两两构成差分对信号线,所述差分对信号线用于传输差分数据信号；地线,所述地线环绕并包覆所述信号线束设置,所述地线用于传输地信号以及将所述信号线束与其他所述数据传输线缆的所述信号线束隔离；填充介质,所述填充介质设于所述地线内侧除所述信号线之外的空间。采用本申请实施例可解决MIPI总线传输质量差、传输距离短以及与其他信号线相互干扰的问题。(The application discloses data transmission cable and relevant equipment, this data transmission cable includes: the signal wire harness comprises at least three signal wires, the at least three signal wires are arranged at intervals and form differential pair signal wires in pairs, and the differential pair signal wires are used for transmitting differential data signals; the ground wire is arranged around and covers the signal wire harness and is used for transmitting ground signals and isolating the signal wire harness from the signal wire harnesses of other data transmission cables; and the filling medium is arranged in the space inside the ground wire except the signal wire. By adopting the embodiment of the application, the problems of poor transmission quality of the MIPI bus, short transmission distance and mutual interference with other signal lines can be solved.)

1. A data transmission cable, characterized in that it comprises:

the signal wire harness comprises at least three signal wires, the at least three signal wires are arranged at intervals and form differential pair signal wires in pairs, and the differential pair signal wires are used for transmitting differential data signals;

the ground wire is arranged around and covers the signal wire harness and is used for transmitting ground signals and isolating the signal wire harness from the signal wire harnesses of other data transmission cables;

and the filling medium is arranged in the space inside the ground wire except the signal wire.

2. The data transmission cable of claim 1, wherein the ground wire has a circular cross-section and the at least three signal wires have a circular cross-section.

3. The data transmission cable according to claim 1 or 2, wherein the at least three signal lines are arranged in parallel.

4. The data transmission cable of any one of claims 1 to 3, wherein the impedance of each signal line is greater than or equal to 45 ohms and less than or equal to 55 ohms.

5. The data transmission cable according to any one of claims 1 to 4, wherein the at least three signal lines are three signal lines, and the three signal lines are rotationally symmetrically arranged inside the ground line.

6. The data transmission cable of any one of claims 1 to 5, wherein the filling medium is a flexible material, preferably polyethylene.

7. The data transmission cable of claims 1-6, further comprising: a first protective layer covering the ground wire arrangement.

8. The data transmission cable of claim 7, wherein the first protective layer is an insulating plastic material.

9. An electronic device, characterized in that the electronic device comprises a camera module, a device motherboard and a transmission cable, the device motherboard comprises an image processor, the transmission cable comprises a second protective layer and at least two data transmission cables according to any one of claims 1-8, the second protective layer is arranged to cover the data transmission cables;

the camera module transmits image data to the image processor via the at least two data transmission cables of any of claims 1-8.

10. The electronic device of claim 9, wherein the transmission cable further comprises a working voltage transmission cable, a control signal transmission cable, the working voltage transmission cable and the control signal transmission cable being disposed within the second protective layer, wherein:

the equipment mainboard provides working voltage for the camera module through the working voltage transmission cable;

the equipment mainboard also transmits a control signal to the camera module through the control signal transmission cable.

11. The electronic device of claim 10, wherein the operating voltage comprises at least one of: the voltage level of the driving chip is set to be the same as the voltage level of the interface circuit, such as the analog voltage AVDD, the digital voltage DVDD, the voice coil motor voltage VCM _ VDD, the driving chip voltage DRV _ VDD and the interface circuit voltage DOVDD.

12. The electronic device of claim 10, wherein the control signal comprises at least one of: reset signal RST, clock signal CLK, two-wire serial bus I2C.

13. The electronic device of claims 9-12, wherein the cross-section of the transmission cable is rectangular or circular.

14. The electronic device according to any one of claims 9 to 13, wherein the operating voltage transmission cable and the control signal transmission cable are provided in common on one side of the data transmission cable, and the operating voltage transmission cable and the control signal transmission cable are provided side by side.

15. The electronic device according to any one of claims 9 to 13, wherein the operating voltage transmission cable and the control signal transmission cable are respectively disposed on both sides of a connection line of the at least two data transmission cables.

Technical Field

The application relates to the technical field of electronics, in particular to a data transmission cable and related equipment.

Background

A Mobile Industry Processor Interface (MIPI) bus is a data transmission Interface technology for inter-chip communication, and at present, MIPI bus is applied more and more widely in the field of terminals (including inter-chip communication such as camera shooting, display, storage, etc.), wherein MIPI C-PHY is a serial Interface technology based on a three-wire three-level coding mode and an embedded clock mechanism, and the current C-PHY Interface rate reaches 10.26 Gbps. By means of a complete ecological industry chain, the MIPI bus technology has excellent technical characteristics of high bandwidth, low power consumption and the like, can be widely applied to chips of terminal equipment for a long time in the future, and becomes a mainstream standard interface of chip manufacturers such as Sony, Samsung, Qualcomm and the like.

High-speed MIPI signals have strict requirements on link loss and electromagnetic interference, and if the conditions of high loss and high interference occur in the transmission process, the signal transmission quality and the transmission distance are affected, and signal decoding failure is caused. With the increase of the MIPI C-PHY signal rate from 7.98Gbps to 10.26Gbps, the influence of link loss and signal interference on the MIPI bus with the same length is greatly increased, and a technology is needed to solve the problems of poor transmission quality, short transmission distance and mutual interference with other signal lines of the MIPI bus.

Disclosure of Invention

The embodiment of the application provides a data transmission cable and related equipment, which are used for solving the problems of poor transmission quality of an MIPI bus, short transmission distance and mutual interference with other signal lines.

In a first aspect, an embodiment of the present application provides a data transmission cable, where the data transmission cable includes:

the signal wire harness comprises at least three signal wires, the at least three signal wires are arranged at intervals and form differential pair signal wires in pairs, and the differential pair signal wires are used for transmitting differential data signals;

the ground wire is arranged around and covers the signal wire harness and is used for transmitting ground signals and isolating the signal wire harness from the signal wire harnesses of other data transmission cables;

and the filling medium is arranged in the space inside the ground wire except the signal wire.

Optionally, the cross section of the ground line is circular, and the cross sections of the at least three signal lines are circular.

Optionally, the at least three signal lines are arranged in parallel.

Optionally, the impedance of each signal line is greater than or equal to 45 ohms and less than or equal to 55 ohms.

Optionally, the at least three signal lines are three signal lines, and the three signal lines are rotationally symmetrically distributed on the inner side of the ground line.

Optionally, the filling medium is a flexible material, and the flexible material is preferably polyethylene.

Optionally, the data transmission cable further includes: a first protective layer covering the ground wire arrangement.

Optionally, the first protection layer is made of an insulating plastic material.

In a second aspect, an embodiment of the present application provides an electronic device, where the electronic device includes a camera module, a device motherboard, and a transmission cable, where the device motherboard includes an image processor, and the transmission cable includes a second protective layer and at least two data transmission cables according to the first aspect, and the second protective layer covers the data transmission cables;

the camera module transmits image data to the image processor via the at least two data transmission cables according to the first aspect.

Optionally, the transmission cable further includes a working voltage transmission cable and a control signal transmission cable, the working voltage transmission cable and the control signal transmission cable are disposed in the second protection layer, wherein:

the equipment mainboard provides working voltage for the camera module through the working voltage transmission cable;

the equipment mainboard is also used for transmitting a control signal to the camera module through a control signal transmission cable.

Optionally, the operating voltage includes at least one of: the voltage level of the driving chip is set to be the same as the voltage level of the interface circuit, such as the analog voltage AVDD, the digital voltage DVDD, the voice coil motor voltage VCM _ VDD, the driving chip voltage DRV _ VDD and the interface circuit voltage DOVDD.

Optionally, the control signal includes at least one of: reset signal RST, clock signal CLK, two-wire serial bus I2C.

Optionally, the cross section of the transmission cable is rectangular or circular.

Optionally, the working voltage transmission cable and the control signal transmission cable are jointly disposed on one side of the data transmission cable, and the working voltage transmission cable and the control signal transmission cable are disposed side by side.

Optionally, the working voltage transmission cable and the control signal transmission cable are respectively disposed on two sides of a connection line of the at least two data transmission cables.

It can be seen that, in the embodiment of the present application, the data transmission cable includes a signal harness, a ground wire and a filling medium, at least three signal lines included in the signal harness are arranged at intervals and two signal lines form a differential pair signal line, so that at least three groups of differential data signals can be transmitted, long-distance MIPI C-PHY data signal transmission is realized, and signal transmission quality is improved; the ground wire is arranged around and covers the signal wire harness, so that the signal wire harness can be isolated from the signal wire harnesses of other data transmission cables while ground signals are transmitted, and the interference of an external signal wire to the signal wires in the data transmission cables is reduced; the filling medium is arranged in the space inside the ground wire except the signal wire, so that the mutual interference among the signal wires inside the data transmission cable is reduced.

These and other aspects of the present application will be more readily apparent from the following description of the embodiments.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic diagram of an electronic system using MIPI bus to transmit data provided in the prior art;

fig. 2 is a schematic diagram of a MIPI C-PHY transmission line provided in the prior art;

FIG. 3 is a schematic diagram of a cable structure for transmitting a pair of high-speed differential signals according to the prior art;

fig. 4(a) is a schematic structural diagram of a data transmission cable according to an embodiment of the present application;

fig. 4(b) and 4(c) are respectively a longitudinal section and a cross-sectional structural schematic diagram of a data transmission cable provided by an embodiment of the present application;

fig. 4(d) is a graph comparing the transmission line insertion loss of the data transmission cable provided in the embodiment of the present application with that of the data transmission cable provided in the prior art;

fig. 5(a) is a schematic structural diagram of an electronic device provided in an embodiment of the present application;

fig. 5(b) is a schematic cross-sectional view of a transmission cable provided in an embodiment of the present application;

fig. 5(c) is a schematic cross-sectional view of another transmission cable provided in the embodiment of the present application.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The following are detailed below.

The terms "first," "second," "third," and "fourth," etc. in the description and claims of this application and in the accompanying drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Hereinafter, some terms in the present application are explained to facilitate understanding by those skilled in the art.

Referring to fig. 1 and 2, fig. 1 is a schematic diagram of an electronic system using a MIPI bus to transmit data according to the prior art, and fig. 2 is a schematic diagram of a MIPI C-PHY transmission line according to the prior art. As shown in fig. 1, the electronic system integrates a camera module, a display module, and a processor, and because the electronic system has a limited volume and the camera module, the display module, and the processor are located at a short distance (generally within a range of 30 cm), a PCB routing structure as shown in fig. 2 is usually adopted among the camera module, the display module, and the processor to transmit MIPI signals, and three wires (i.e., A, B, C) are adopted to transmit MIPI C-PHY signals, which puts strict requirements on link loss and interference between PCB routings.

Therefore, the above solution has three disadvantages:

firstly, the MIPI signal is influenced by PCB routing loss, and the transmission distance is generally within 30cm, so that the long-distance application scenes such as intelligent screens, vehicle-mounted devices, security and the like cannot be met.

Secondly, the MIPI high-speed signals are sensitive to PCB routing loss, so that the transmission quality of the signals is poor (for example, the pictures have the problems of stripes and the like).

Thirdly, due to the high transmission rate of the MIPI signals, the generated electromagnetic interference is large, and the MIPI signals are easily interfered by other signals, so that the working stability of the equipment (such as screen display screen splash) is influenced.

Referring to fig. 3, fig. 3 is a schematic diagram of a cable structure for transmitting a pair of high-speed differential signals provided in the prior art, in which signal lines P and N form a pair of differential signals, and GND is a ground signal. The cable is processed by adopting a shielding package, so that the transmission quality of differential signals can be ensured during long-distance transmission, and the transmission distance can exceed 1 meter.

It can be seen that, in the present solution, since the signal lines P and N can only form a pair of differential signals, only one group of differential signals can be transmitted, and when the C-PHY signal is transmitted, three cables of this kind need to be used for transmission, and redundant lines exist, which results in a large occupied volume.

In order to solve the above problems, embodiments of the present application provide a data transmission cable and a related apparatus, see the following apparatus-side embodiments.

Referring to fig. 4(a), fig. 4(b) and fig. 4(c), fig. 4(a) is a schematic structural diagram of a data transmission cable according to an embodiment of the present application, and fig. 4(b) and fig. 4(c) are schematic structural diagrams of a longitudinal section and a cross section of the data transmission cable according to the embodiment of the present application, respectively, where the data transmission cable 100 includes:

a signal wire harness 110 including at least three signal wires, the at least three signal wires being arranged at intervals and forming a differential pair signal wire in pairs, the differential pair signal wire being used for transmitting a differential data signal;

a ground wire 120, the ground wire 120 surrounding and covering the signal harness 110, the ground wire 120 being used for transmitting ground signals and isolating the signal harness 110 from the signal harnesses 110 of other data transmission cables 100;

and a filling medium 130, wherein the filling medium 130 is arranged in a space inside the ground line 120 except the signal line.

It can be seen that, in the embodiment of the present application, the data transmission cable includes a signal harness, a ground wire and a filling medium, at least three signal lines included in the signal harness are arranged at intervals and two signal lines form a differential pair signal line, so that at least three groups of differential data signals can be transmitted, long-distance MIPI C-PHY data signal transmission is realized, and signal transmission quality is improved; the ground wire is arranged around and covers the signal wire harness, so that the signal wire harness can be isolated from the signal wire harnesses of other data transmission cables while ground signals are transmitted, and the interference of an external signal wire to the signal wires in the data transmission cables is reduced; the filling medium is arranged in the space inside the ground wire except the signal wire, so that the mutual interference among the signal wires inside the data transmission cable is reduced.

Optionally, the cross section of the ground line 120 is circular, and the cross sections of the at least three signal lines are circular.

Optionally, the cross sections of the at least three signal lines may also be square, rectangular, circular arc, or other shapes, which are not limited herein.

Alternatively, the at least three signal lines may be arranged in parallel.

Alternatively, the at least three signal lines may be spirally wound around the same axis.

When the signal lines are arranged in parallel, the distances between at least three signal lines may be equal or different, and are not limited herein.

The axis may be an axis where a center of a circle is located, or an axis where any point in the circle is located, which is not limited herein.

Optionally, the impedance of each signal line is greater than or equal to 45 ohms and less than or equal to 55 ohms.

Optionally, the at least three signal lines are three signal lines, and the three signal lines are rotationally symmetrically distributed on the inner side of the ground line.

It should be noted that, if there are three signal lines, the rotational symmetry angle is 120 °; if the number of the signal lines is four, the rotational symmetry angle is 90 degrees; if the number of the signal lines is five, the rotational symmetry angle is 72 degrees; and so on, and will not be illustrated.

Optionally, the filling medium 130 is a flexible material, and the flexible material is preferably polyethylene.

Optionally, the data transmission cable 100 further includes: a first protective layer 140 disposed to cover the ground line 120.

Optionally, the first protection layer 140 is an insulating plastic material.

Referring to fig. 4(d), fig. 4(d) is a graph comparing the transmission line insertion loss of the data transmission cable provided in the embodiment of the present application with that of the data transmission cable provided in the prior art. The data transmission cable provided by the embodiment of the application and the data transmission cable provided by the prior art are both 1.2 m. As can be seen from fig. 4(d), the transmission line insertion loss of the data transmission cable provided in the embodiment of the present application is lower than that of the data transmission cable provided in the prior art when the same transmission medium is used. Among them, at the frequency of 1GHz, the transmission line insertion loss of the data transmission cable provided by the embodiment of the application is reduced by 8.559 dB. Therefore, the data transmission cable provided by the embodiment of the application can improve the transmission quality of the MIPI signal and improve the transmission distance of the MIPI signal.

Referring to fig. 5(a), fig. 5(a) is a schematic structural diagram of an electronic device provided in an embodiment of the present application, and is applied to a mobile terminal, a smart screen, a vehicle-mounted terminal, a security terminal, and the like, where the electronic device 200 includes a camera module 210, a device motherboard 220, and a transmission cable 230, the device motherboard 220 includes an image processor 221, the transmission cable 230 includes a second protective layer 231 and at least two data transmission cables 100 as described above, and the second protective layer 231 covers the data transmission cables 100;

the camera module 210 transmits image data to the image processor 221 via the at least two data transmission cables 100 as described above.

It can be seen that, in the embodiment of the present application, multiple sets of signals of different types can be transmitted between the camera module and the device main board, interference between different signal lines is reduced through shielding protection, and link loss is reduced through transmission line impedance matching, so that long-distance transmission of high-speed signals is achieved.

Optionally, the transmission cable 230 further includes a working voltage transmission cable 232 and a control signal transmission cable 233, the working voltage transmission cable 232 and the control signal transmission cable 233 are disposed in the second protective layer 231, wherein:

the device main board 220 provides a working voltage for the camera module 210 through the working voltage transmission cable 232;

the device main board 220 also transmits a control signal to the camera module 210 through the control signal transmission cable 233.

Optionally, the operating voltage includes at least one of: the voltage level of the driving chip is set to be the same as the voltage level of the interface circuit, such as the analog voltage AVDD, the digital voltage DVDD, the voice coil motor voltage VCM _ VDD, the driving chip voltage DRV _ VDD and the interface circuit voltage DOVDD.

The AVDD is analog voltage required by the work of the camera module, the DVDD is digital voltage required by the work of the image sensor, the VCM _ VDD is voltage required by the work of the voice coil motor, the DRV _ VDD is voltage required by the work of the driving chip, and the DOVDD is digital voltage required by the work of the data input and output module.

Optionally, the control signal includes at least one of: a reset signal RST, a clock signal CLK, an Inter-Integrated Circuit (I2C).

Here, RST is abbreviated as RESET, and the RESET signal is generally used in a circuit of a CPU, and means RESET and initialization, and the RESET signal is used to initialize the circuit at the time of power-on, and is used to restart the circuit when an abnormal halt occurs in the operating state of the circuit.

Where CLK is shorthand for CLOCK, and is the shift pulse supplied to the shift register, each pulse will cause data to be shifted in or out by one bit. The data on the data port must be coordinated with the clock signal to properly transfer the data, and the frequency of the data signal must be 1/2 times the frequency of the clock signal.

Of these, I2C is a simple, bi-directional two-wire synchronous serial bus developed by Philips. It requires only two wires to transfer information between devices connected to the bus. I2C includes Serial Data (SDA) and Serial Clock (SCL).

Optionally, the cross-section of the transmission cable 230 is rectangular or circular.

Optionally, the working voltage transmission cable 232 and the control signal transmission cable 233 are commonly disposed at one side of the data transmission cable 100, and the working voltage transmission cable 232 and the control signal transmission cable 233 are disposed side by side.

Referring to fig. 5(b), fig. 5(b) is a schematic cross-sectional view of a transmission cable according to an embodiment of the present disclosure. In fig. 5(b), the working voltage transmission cable and the control signal transmission cable are commonly disposed at one side of the data transmission cable, and the working voltage transmission cable and the control signal transmission cable are disposed side by side, and the working voltage transmission cables AVDD, DVDD, VCM _ VDD, DRV _ VDD, and DOVDD, and the control signal transmission cables RST, CLK, SCL, and SDL form a rectangular array disposed side by side.

Optionally, the operating voltage transmission cable 232 and the control signal transmission cable 233 are respectively disposed at two sides of a connection line of the at least two data transmission cables 100.

Referring to fig. 5(c), fig. 5(c) is a schematic cross-sectional view of another transmission cable provided in the embodiments of the present application. In fig. 5(c), the working voltage transmission cable and the control signal transmission cable are respectively disposed at two sides of a connection line of two data transmission cables, the two data transmission cables are disposed opposite to each other, and the working voltage transmission cables AVDD, DVDD, VCM _ VDD, DRV _ VDD, and DOVDD are disposed opposite to the control signal transmission cables RST, CLK, SCL, and SDL.

The above embodiments of the present invention are described in detail, and the principle and the implementation of the present invention are explained by applying specific embodiments, and the above description of the embodiments is only used to help understanding the method of the present invention and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in view of the above, the content of the present specification should not be construed as a limitation to the present invention.