Test board control circuit, test board and test system
By introducing a multiplexer into the camera module test board for signal separation, the problem of low signal transmission rate was solved, resulting in higher transmission rate and more stable test results.
Patent Information
- Application Number
- CN202520312134.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-02-25
AI Technical Summary
The existing camera module test boards have low signal transmission rates, which are insufficient to meet the ever-increasing demands.
By introducing a multiplexer, the signal transmission lines of the camera module are separated from the image test module and the system test module. The multiplexer is used to separate and switch signals, reduce signal transfers, and ensure impedance continuity.
It increases signal transmission rate, reduces signal loss, and improves testing efficiency and stability.
Smart Images
Figure CN223928372U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of integrated circuits, in particular to a test board control circuit, a test board and a test system. BACKGROUND
[0002] In the prior art, the signal transmission rate of the camera module test board is not high, but people's demand for signal transmission rate is increasing, so the traditional test board has gradually been difficult to meet people's needs. CONTENT OF THE INVENTION
[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application proposes a test board control circuit, a test and a test system, by using a multiplexer, the transmission line of the camera module can be directly connected with the second connector, thereby improving the signal transmission rate.
[0004] The present application also proposes a test board with the above test board control circuit.
[0005] The present application also proposes a test system with the above test board.
[0006] The test board control circuit according to the first aspect of the present application comprises a first connector; a second connector; a system test module for testing a camera module; a multiplexer connected with the system test module, one end of the first connector is connected with the multiplexer, and the other end is used for connecting with the camera module, one end of the second connector is connected with the multiplexer, and the other end is used for connecting with an image test module, the multiplexer is used for transmitting the signal of the camera module to the image test module or the system test module.
[0007] The test board control circuit according to the present application has at least the following beneficial effects: in the prior art camera module test board, the line for transmitting the signal output by the camera module to the image test module is the same as the line for transmitting the signal to the system test module, but the present application introduces a multiplexer as a signal separator, so that the line for the image test module is separated from the line for the system test module, so that when the signal input by the camera module is transmitted to the image test module, it no longer passes through the two board-to-board connectors of the system test module, that is, the signal is no longer transmitted to the image test module through the system test module, reducing the signal switching, ensuring the continuity of impedance, reducing the signal loss, and improving the signal transmission rate.
[0008] According to some embodiments of the present application, the multiplexer comprises a re-driver connected with the second connector through the re-driver, and the re-driver is configured to enhance the driving capability of the signal transmitted to the second connector.
[0009] According to some embodiments of the present application, the power supply module comprises a first resistor, a first capacitor, a second capacitor and a third capacitor, the first capacitor, the second capacitor and the third capacitor are connected in parallel, one end of the first capacitor is grounded, and the other end is connected with the first resistor and the multiplexer respectively, and the other end of the first resistor is configured to be connected with a power supply.
[0010] According to some embodiments of the present application, the voltage stabilizing module is connected with the second connector, the re-driver and the power supply module respectively, and the voltage stabilizing module is configured to stabilize the input voltage.
[0011] According to some embodiments of the present application, the voltage stabilizing module comprises a voltage stabilizer and a second resistor, the input end of the voltage stabilizer is connected with the second connector through the second resistor, the output end of the voltage stabilizer is connected with the re-driver and the first resistor respectively, and the ground end of the voltage stabilizer is grounded.
[0012] According to some embodiments of the present application, the voltage stabilizing module comprises a fourth capacitor, a fifth capacitor and a third resistor, the fourth capacitor and the fifth capacitor are connected in parallel, one end of the fourth capacitor is connected between the second resistor and the input end of the voltage stabilizer, and the other end is grounded, and the enable end of the voltage stabilizer is connected between the second resistor and the input end of the voltage stabilizer through the third resistor.
[0013] According to some embodiments of the present application, the voltage stabilizing module comprises a sixth capacitor and a seventh capacitor, the sixth capacitor and the seventh capacitor are connected in parallel, one end of the sixth capacitor is connected with the output end of the voltage stabilizer, and the other end is grounded.
[0014] According to some embodiments of the present application, the second connector is a high-speed connector.
[0015] The test board according to the second aspect of the embodiments of the present application comprises:
[0016] The test board control circuit according to the first aspect of the embodiments of the present application.
[0017] According to the test board of the embodiment of the present application, at least the following beneficial effects are achieved: in the camera module test board of the prior art, the signal output by the camera module is transmitted to the same line of the image test module and the system test module, and the present application introduces a multiplexer as a signal separator, so that the line of the image test module and the line of the system test module are separated, and the signal input by the camera module is no longer transmitted to the two board-to-board connectors of the system test module when the signal is transmitted to the image test module, that is, the signal is no longer transmitted to the system test module when the signal is transmitted to the image test module, thereby reducing the signal switching, ensuring the continuity of impedance, reducing the signal loss, and improving the signal transmission rate. By introducing the test board control circuit of the present application, the test board of the present application can improve the test efficiency while stabilizing the bit error rate.
[0018] The test system according to the third aspect of the embodiment of the present application comprises:
[0019] The test board of the second aspect of the embodiment of the present application.
[0020] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter in the description of the application. BRIEF DESCRIPTION OF DRAWINGS
[0021] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the description of the embodiments, given in conjunction with the accompanying drawings, in which:
[0022] Figure 1 The principle block diagram of the test board control circuit of the embodiment of the present application;
[0023] Figure 2 The schematic diagram of the power supply module circuit of the embodiment of the present application;
[0024] Figure 3 The schematic diagram of the voltage stabilizing module circuit of the embodiment of the present application;
[0025] Figure 4 The schematic diagram of the multiplexer of the embodiment of the present application;
[0026] Figure 5 The principle block diagram of the test board control circuit of the prior art. DETAILED DESCRIPTION
[0027] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.
[0028] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by the upper, lower, front, rear, left, right and the like, is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.
[0029] In the description of the present application, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, more than and the like are understood as not including the number, above, below, within and the like are understood as including the number. If the first, second is described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance of the indicated technical features or implying that the indicated technical features are the number of the indicated technical features or implying the order of the indicated technical features.
[0030] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.
[0031] At present, reference Figure 5 In the prior art, before the camera module is connected with the image test module through the second connector, it needs to pass through the system test module, that is, two test modules share a line, and when the transmitted signal is transmitted to the image test module through the system test module, it also needs to pass through two board-to-board connectors. The two board-to-board connectors serve as an adapter to adapt the transmitted signal, which greatly affects the signal transmission rate, so that the signal transmission rate of the camera module test board is not high, and the demand for signal transmission rate is increasing, so the traditional test board has gradually been difficult to meet people's needs.
[0032] Based on this, the present application proposes a test board control circuit, which separates the lines of different test modules in the test board by introducing a multiplexer, to promote the improvement of signal transmission rate.
[0033] The following references Figure 1 The test board control circuit of the embodiment of the present application is described.
[0034] It can be understood that the test board control circuit of the embodiment of the application comprises a first connector, a second connector, a system test module and a multiplexer, the system test module is used for testing the camera module, the multiplexer is connected with the system test module, one end of the first connector is connected with the multiplexer, and the other end is used for being connected with the camera module, one end of the second connector is connected with the multiplexer, and the other end is used for being connected with the image test module, and the multiplexer is used for transmitting the signal of the camera module to the image test module or the system test module.
[0035] The beneficial effects of the test board control circuit of the embodiment of the application can be that, in the camera module test board of the prior art, the line for transmitting the signal output by the camera module to the image test module and the line for transmitting the signal to the system test module are the same, and the application introduces the multiplexer as a signal separator, so that the line for the image test module and the line for the system test module are separated, and when the signal input by the camera module is transmitted to the image test module, it no longer passes through the two board-to-board connectors of the system test module, that is, the signal is no longer transmitted to the system test module when it is transmitted to the image test module, the signal switching is reduced, the continuity of impedance is ensured, the signal loss is reduced, and the signal transmission rate is improved.
[0036] For example, in some embodiments, with reference to Figure 1 In this embodiment, the camera module is connected with the multiplexer through the first connector, the multiplexer is also connected with the second connector and the system test module respectively, the second connector is also connected with the image test module, and the switching of the lines can be performed in the multiplexer, that is, the line for the multiplexer and the system test module and the line for the multiplexer and the second connector can only be conducted at the same time. For example, when the multiplexer and the system test module are conducted, the system test module starts to work, at this time, the multiplexer and the second connector are cut off, and thus the image test module does not work, when the multiplexer and the second connector are switched to be conducted, the image test module starts to work, at this time, the multiplexer and the system test module are cut off, and the system test module does not work, thereby realizing the separation of the lines of different test modules and promoting the improvement of the signal transmission rate. The system test module is used for detecting whether the line of the camera module exists an open circuit, the image test module is used for testing whether the photographing, video and other functions of the camera module are normal, and at the same time, the second connector is also connected with a control module, and the control module controls the multiplexer to switch the test module through the second connector.
[0037] It can be understood that the test board control circuit comprises a re-driver, the multiplexer is connected with the second connector through the re-driver, and the re-driver is used for enhancing the driving capability of the signal transmitted to the second connector.
[0038] For example, in some embodiments, with reference to Figure 1In the embodiment, the multiplexer is connected with the second connector through the re-driver, so as to enhance the driving capability of the signal transmitted to the second connector, reduce the loss in the signal transmission process, and improve the stability of the circuit.
[0039] It can be understood that the test board control circuit includes a power supply module, the power supply module includes a first resistor, a first capacitor, a second capacitor and a third capacitor, the first capacitor, the second capacitor and the third capacitor are connected in parallel, one end of the first capacitor is grounded, the other end is connected with the first resistor and the multiplexer respectively, and the other end of the first resistor is used for being connected with the power supply.
[0040] For example, in some embodiments, with reference to Figure 2 In the embodiment, R401 is the first resistor, C401 is the first capacitor, C402 is the second capacitor, and C403 is the third capacitor, the first capacitor, the second capacitor and the third capacitor are connected in parallel, one end of the first capacitor is grounded, the other end is connected with the multiplexer and one end of the first resistor respectively, and the other end of the first resistor is connected with the power supply. The power supply not only supplies power for the multiplexer, but also charges the first capacitor, the second capacitor and the third capacitor. When the power supply end is suddenly powered off, the first capacitor, the second capacitor and the third capacitor are in a discharging state, thereby continuing to supply power to the multiplexer, so as to prevent the current from changing too much to damage the circuit.
[0041] It can be understood that the test board control circuit includes a voltage stabilizing module, the voltage stabilizing module is connected with the second connector, the re-driver and the power supply module respectively, and the voltage stabilizing module is used for stabilizing the input voltage.
[0042] For example, in some embodiments, with reference to Figure 3 In the embodiment, the power supply connected with the first resistor of the power supply module is the voltage stabilizing module, the DCR_5V end is connected with the second connector, and the EX_3V3 end is connected with the re-driver and the power supply module, so as to stabilize the voltage in the circuit, and then stabilize the current input to the power supply module.
[0043] It can be understood that the voltage stabilizing module includes a voltage stabilizer and a second resistor, the input end of the voltage stabilizer is connected with the second connector through the second resistor, the output end of the voltage stabilizer is connected with the re-driver and the first resistor respectively, and the grounding end of the voltage stabilizer is grounded.
[0044] For example, in some embodiments, with reference to Figure 3In the embodiment, R301 is a second resistor, U3 is a voltage stabilizer, the voltage stabilizer has 9 terminal pins, the second connector is connected with the pin 8 (an input end) of the voltage stabilizer through the second resistor, thereby limiting the current input to the voltage stabilizer, preventing the voltage stabilizer from being damaged by too large current, the pin 1 (an output end) of the voltage stabilizer is connected with the heavy driver and the power supply module through the EX_3V3 end, and the pin 9 (a ground end) of the voltage stabilizer is grounded, so that the stability of internal lines of the voltage stabilizer is maintained.
[0045] It can be understood that the voltage stabilization module includes a fourth capacitor, a fifth capacitor and a third resistor, the fourth capacitor and the fifth capacitor are connected in parallel, one end of the fourth capacitor is connected between the second resistor and the input end of the voltage stabilizer, and the other end is grounded, and the enable end of the voltage stabilizer is connected between the second resistor and the input end of the voltage stabilizer through the third resistor.
[0046] For example, in some embodiments, with reference to Figure 3 In the embodiment, R302 is a third resistor, C301 is a fourth capacitor, C302 is a fifth capacitor, the fourth capacitor and the fifth capacitor are connected in parallel, one end of the fourth capacitor is grounded, and the other end is connected with the second connection, the input end of the voltage stabilizer through the second resistor, so as to reduce the fluctuation of the input end voltage of the voltage stabilizer and the interference of noise. The pin 5 (an enable end) of the voltage stabilizer is connected with the pin 8 (an input end) through the third resistor, so as to reduce the interference of noise. The port DCR_5V connected with the input end of the voltage stabilizer is also connected with the system test module.
[0047] It can be understood that the voltage stabilization module includes a sixth capacitor and a seventh capacitor, the sixth capacitor and the seventh capacitor are connected in parallel, one end of the sixth capacitor is connected with the output end of the voltage stabilizer, and the other end is grounded.
[0048] For example, in some embodiments, with reference to Figure 3 In the embodiment, C303 is a sixth capacitor, C304 is a seventh capacitor, the seventh capacitor and the sixth capacitor are connected in parallel, one end of the sixth capacitor is grounded, and the other end is connected with the output end of the voltage stabilizer, that is, the pin 1 of the voltage stabilizer, so as to reduce the fluctuation of the output voltage of the voltage stabilizer.
[0049] It can be understood that the second connector is a high-speed connector.
[0050] For example, in some embodiments, the second connector is a high-speed connector, so as to realize high-speed transmission of the input signal of the camera module and improve the rate of signal transmission.
[0051] In some specific embodiments, the multiplexer of the application adopts a TMUXHS4412 type multiplexer, with reference to Figure 4In the embodiment, the multiplexer is TMUXHS4412, which has 43 terminal pins, wherein the pins 6, 9, 16, 21, 30, 39 and 43 are grounded, the pins 3, 4, 7, 8, 10, 11, 14 and 15 are connected with the first connector, the pins 24, 25, 28, 29, 33, 34, 37 and 38 are connected with the redriver, the pins 22, 23, 26, 27, 31, 32, 35 and 36 are connected with the system test module, the pins 18 and 17 are ports for connecting the control multiplexer switching test module line, and the pins 18 and 19 are connected with the second connector. When the MUX_GPIO0 port of the pin 18 inputs a low level, the multiplexer is in a working state, at this time, the switching of the test module line can be performed, if a high level is input, the multiplexer stops working, and when the multiplexer is in the working state, if the MUX_GPIO1 port of the pin 17 inputs a low level to the multiplexer, the multiplexer is conducted between the image test module and the multiplexer is cut off between the system test module, that is, at this time, the circuit is in the image test mode, and if a high level is input to the MUX_GPIO1 port, the multiplexer is conducted between the system test module and the multiplexer is cut off between the image test module, at this time, the circuit is in the system test mode, and the switching of different test modules is realized.
[0052] According to the test board of the second aspect of the embodiment, the test board control circuit of the first aspect of the embodiment is used.
[0053] According to the test board of the embodiment, in the prior art camera module test board, the signal output by the camera module is transmitted to the same line of the image test module and the system test module, and the multiplexer is introduced as a signal separator in the embodiment, so that the line of the image test module is separated from the line of the system test module, the signal input by the camera module is no longer transmitted to the two board-to-board connectors of the system test module when the signal is transmitted to the image test module, that is, the signal is no longer transmitted to the system test module, the signal switching is reduced, the continuity of impedance is ensured, the signal loss is reduced, and the signal transmission rate is improved. The test board control circuit is introduced, so that the test board can improve the test efficiency while stabilizing the bit error rate.
[0054] Since the test board includes the test board control circuit of the first aspect of the embodiment, the corresponding contents of the test board control circuit in the first aspect of the embodiment can be applied to the test board of the second aspect, and have the same implementation principles and technical effects. To avoid redundant description, the details are not described here.
[0055] The test system according to the third aspect of the present application comprises the test board according to the second aspect of the present application.
[0056] The embodiments of the present application are described in detail above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art in the technical field without departing from the purpose of the present application.
Claims
1. A test board control circuit, characterized by, The system comprises: a first connector; a second connector; a system test module for testing a camera module; a multiplexer connected to the system test module, one end of the first connector is connected to the multiplexer, and the other end is used for connecting to the camera module, one end of the second connector is connected to the multiplexer, and the other end is used for connecting to an image test module, and the multiplexer is used for transmitting signals of the camera module to the image test module or the system test module.
2. The test board control circuit of claim 1, wherein, The multiplexer is connected to the second connector through a re-driver, and the re-driver is used for enhancing the driving capability of the signals transmitted to the second connector.
3. The test board control circuit of claim 2, wherein, The system comprises a power supply module, which comprises a first resistor, a first capacitor, a second capacitor and a third capacitor, the first capacitor, the second capacitor and the third capacitor are connected in parallel, one end of the first capacitor is grounded, and the other end is connected to the first resistor and the multiplexer respectively, and the other end of the first resistor is used for connecting to a power supply.
4. The test board control circuit of claim 3, wherein, The system comprises a voltage stabilizing module connected to the second connector, the re-driver and the power supply module respectively, and the voltage stabilizing module is used for stabilizing the input voltage.
5. The test board control circuit of claim 4, wherein, The voltage stabilizing module comprises a voltage stabilizer and a second resistor, the input end of the voltage stabilizer is connected to the second connector through the second resistor, the output end of the voltage stabilizer is connected to the re-driver and the first resistor respectively, and the ground end of the voltage stabilizer is grounded.
6. The test board control circuit of claim 5, wherein, The voltage stabilizing module comprises a fourth capacitor, a fifth capacitor and a third resistor, the fourth capacitor and the fifth capacitor are connected in parallel, one end of the fourth capacitor is connected between the second resistor and the input end of the voltage stabilizer, and the other end is grounded, and the enable end of the voltage stabilizer is connected between the second resistor and the input end of the voltage stabilizer through the third resistor.
7. The test board control circuit of claim 6, wherein, The voltage stabilizing module comprises a sixth capacitor and a seventh capacitor, the sixth capacitor and the seventh capacitor are connected in parallel, one end of the sixth capacitor is connected to the output end of the voltage stabilizer, and the other end is grounded.
8. The test board control circuit of claim 1, wherein, The second connector is a high-speed connector.
9. A test plate characterized by The system comprises: The test board control circuit of any one of claims 1 to 8.
10. A test system, characterized by The system comprises: The test board of claim 9.