CN216449712U

CN216449712U - Line detection device

Info

Publication number: CN216449712U
Application number: CN202123127009.3U
Authority: CN
Inventors: 朱希盼
Original assignee: Chipone Technology Beijing Co Ltd
Current assignee: Chipone Technology Beijing Co Ltd
Priority date: 2021-12-13
Filing date: 2021-12-13
Publication date: 2022-05-06
Anticipated expiration: 2031-12-13

Abstract

The utility model relates to a line detection device, which is used for detecting an SPI communication line of a touch display module, and comprises: a device main body; the detection circuit comprises at least one pull-up resistor, wherein the first end of the pull-up resistor is used for receiving a first voltage signal, the second end of the pull-up resistor is connected to one end of the SPI communication line, the other end of the SPI communication line is used for receiving a second voltage signal, and the connection point of the pull-up resistor and the SPI communication line is used for outputting a detection voltage signal; and the comparison circuit is used for comparing the detection voltage signal with a reference voltage signal and outputting a comparison result signal. According to the embodiment of the utility model, the voltage of the SPI communication line can be detected through the detection circuit of the device, and the state of the SPI communication line of the touch display module is detected through the comparison of the comparison circuit and the reference voltage signal, so that the characteristics of simple scheme, high detection efficiency and high detection accuracy are achieved.

Description

Line detection device

Technical Field

The utility model relates to the technical field of testing, in particular to a line detection device.

Background

At present, most communication modes in the touch aspect of the touch display module are Serial Peripheral Interface (SPI), and if a micro-fault occurs in an SPI line, the micro-fault is not easily found in a production stage in the early period, and the micro-fault deteriorates later to become a defective product, so that the method has an important significance in performing line detection on the SPI communication line of the touch display module.

SUMMERY OF THE UTILITY MODEL

According to an aspect of the present invention, there is provided a line detection apparatus for detecting an SPI communication line of a touch display module, the apparatus comprising:

a device main body;

the detection circuit is arranged on the device main body and comprises at least one pull-up resistor, the first end of the pull-up resistor is used for receiving a first voltage signal, the second end of the pull-up resistor is connected to one end of the SPI communication line, and the other end of the SPI communication line is used for receiving a second voltage signal, wherein the connection point of the pull-up resistor and the SPI communication line is used for outputting a detection voltage signal, and the first voltage signal is higher than the second voltage signal;

and the comparison circuit is arranged on the device main body, is connected to the detection circuit and is used for comparing the detection voltage signal with the reference voltage signal and outputting a comparison result signal, wherein the comparison result signal comprises a first state and a second state, the first state is used for indicating that the SPI circuit is in a normal state, and the second state is used for indicating that the SPI circuit is in an abnormal state.

In a possible embodiment, the apparatus further comprises:

the signal processing circuit is connected with the detection circuit and used for preprocessing the detection voltage signal and outputting the processed detection voltage signal;

and the comparison circuit is connected with the signal processing circuit and used for comparing the processed detection voltage signal with a reference voltage signal and outputting a comparison result signal.

In one possible implementation, the signal processing circuit includes:

the amplifying module is used for amplifying the detection voltage signal to obtain an amplified detection voltage signal;

and the filtering module is connected to the amplifying module and used for filtering the amplified detection voltage signal to obtain the processed detection voltage signal.

In one possible implementation, the amplifying module includes at least one stage of amplifying unit, and the amplifying unit includes an operational amplifier, a first amplifying resistor, and a second amplifying resistor, wherein,

the positive input end of the operational amplifier is used for receiving the detection voltage signal, and the output end of the operational amplifier is connected to the first end of the first amplification resistor and used for outputting the amplified detection voltage signal;

the negative input end of the operational amplifier is connected to the second end of the first amplifying resistor and the first end of the second amplifying resistor, and the second end of the second amplifying resistor is grounded.

In one possible embodiment, the filter module comprises a filter capacitor and a filter resistor, wherein,

the first end of the filter resistor and the first end of the filter capacitor are both connected to the amplified detection voltage signal, and the second end of the filter resistor and the second end of the filter capacitor are both grounded.

In one possible embodiment, the comparison circuit comprises a comparator, a first comparison resistor, a second comparison resistor, and a third comparison resistor, wherein,

a first end of the first comparison resistor is used for receiving the detection voltage signal, a second end of the first comparison resistor is connected with a first input end of the comparator,

a first end of the second comparison resistor is used for receiving the reference voltage signal, a second end of the second comparison resistor is connected to the second input end of the comparator,

the output end of the comparator is connected with the first end of the third comparison resistor and outputs the comparison result signal,

and the second end of the third comparison resistor is used for receiving a power supply voltage.

In a possible embodiment, the apparatus further comprises:

and the power supply circuit is connected with the detection circuit and the comparison circuit and is used for providing the first voltage signal, the second voltage signal and a reference voltage signal of the comparison circuit.

In one possible embodiment, the supply circuit comprises an AC-DC module and/or a DC-DC module.

The embodiment of the utility model provides a circuit detection device, which comprises a device main body; the detection circuit is arranged on the device main body and comprises at least one pull-up resistor, the first end of the pull-up resistor is used for receiving a first voltage signal, the second end of the pull-up resistor is connected to one end of the SPI communication line, and the other end of the SPI communication line is used for receiving a second voltage signal, wherein the connection point of the pull-up resistor and the SPI communication line is used for outputting a detection voltage signal, and the first voltage signal is higher than the second voltage signal; and the comparison circuit is arranged on the device main body, is connected to the detection circuit and is used for comparing the detection voltage signal with the reference voltage signal and outputting a comparison result signal, wherein the comparison result signal comprises a first state and a second state, the first state is used for indicating that the SPI circuit is in a normal state, and the second state is used for indicating that the SPI circuit is in an abnormal state. According to the embodiment of the utility model, the voltage of the SPI communication line can be detected through the detection circuit of the device, and the state of the SPI communication line of the touch display module is detected through the comparison of the comparison circuit and the reference voltage signal, so that the characteristics of simple scheme, high detection efficiency and high detection accuracy are achieved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the utility model, as claimed. Other features and aspects of the present invention will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and, together with the description, serve to explain the principles of the utility model.

Fig. 1 shows a block diagram of a line detection apparatus according to an embodiment of the present invention.

Fig. 2 shows a block diagram of a line detection apparatus according to an embodiment of the present invention.

Fig. 3 shows a schematic diagram of an amplifying cell of an amplifying circuit according to an embodiment of the utility model.

Fig. 4 shows a schematic diagram of a filter circuit according to an embodiment of the utility model.

FIG. 5 shows a schematic diagram of a comparison circuit according to an embodiment of the utility model.

Detailed Description

Various exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the term "at least one" herein means any one of a plurality or any combination of at least two of a plurality, for example, including at least one of A, B, C, and may mean including any one or more elements selected from the group consisting of A, B and C.

Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In some instances, methods, procedures, components, and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present invention.

To this touch-control display module assembly's SPI circuit unusual, correlation technique is through the microscope detect SPI circuit whether unusual, but, to some tiny problems, also probably can't discover through the microscope, therefore, correlation technique uses touch-control display module assembly under environment such as high temperature, high humidity, high speed, physical damage, when the environment worsens, the tiny problem of SPI circuit can be enlargied, the communication work that will lead to touch-control display module assembly appears unusually, however, correlation technique is comparatively complicated on the one hand, and can't detect some SPI unusually, on the other hand, extreme test method itself through the worsened environment also can lead to SPI circuit unusual, thereby lead to the test inaccurate.

Referring to fig. 1, fig. 1 is a block diagram of a circuit detection apparatus according to an embodiment of the utility model.

As shown in fig. 1, the apparatus includes:

a device main body 10;

the detection circuit 110 is disposed on the device body 10, the detection circuit 110 includes at least one pull-up resistor Rup, a first end of the pull-up resistor Rup is configured to receive a first voltage signal Vdd, a second end of the pull-up resistor Rup is connected to one end of the SPI communication line, and the other end of the SPI communication line is configured to receive a second voltage signal Vgnd, where a connection point of the pull-up resistor Rup and the SPI communication line is configured to output a detection voltage signal Vsense, and the first voltage signal Vdd is higher than the second voltage signal Vgnd;

the comparison circuit 120 is disposed on the device body 10, connected to the detection circuit 110, and configured to compare the detection voltage signal Vsense with a reference voltage signal Vref, and output a comparison result signal Vcmp, where the comparison result signal Vcmp includes a first state and a second state, the first state is used for indicating that the SPI line is in a normal state, and the second state is used for indicating that the SPI line is in an abnormal state.

The device body 10 according to an embodiment of the present invention may include a test Board, the test Board may be a Printed Circuit Board (PCB), and the detection Circuit 110 and the comparison Circuit 120 may be disposed on the PCB to fix and assemble the detection Circuit 110 and the comparison Circuit 120 to realize electrical connection.

The SPI communication line of the embodiment of the present invention operates in a master-slave manner, and this mode usually has one master device and one or more slave devices, and requires at least 3 lines or 4 lines, including SDI (data input), SDO (data output), SCLK (clock), CS (chip select), and the like, where SDO/MOSI may be master device data output and slave device data input; the SDI/MISO can be a master device data input and a slave device data output; SCLK may be a clock signal, generated by the master device; the CS/SS may be a slave enable signal, controlled by the master. For example, when there are multiple slave devices, since each slave device has a chip select pin connected to the host device, when the host device communicates with a certain slave device, the level of the chip select pin corresponding to the slave device needs to be pulled down or pulled up.

The embodiment of the utility model can detect any SPI line to judge whether the SPI line is normal or not. According to the embodiment of the utility model, whether a large resistor exists in the SPI communication line is judged by testing the voltage division between the pull-up resistor and the routing resistor (the resistor of the SPI line) so as to screen out defective products. Taking one of the lines MOSI of the SPI communication line as an example, a schematic diagram of determining a routing resistance (Rspi) of the MOSI by resistance voltage division is shown in fig. 1. During testing, the embodiment of the present invention may input the second voltage signal (e.g. low level) to the MOSI terminal to set the MOSI to a pull-down (GND) state, input the first voltage signal Vdd (e.g. high level) to the input terminal of the pull-up resistor Rup, and determine the size of the trace resistor Rspi through the comparison result signal Vcmp output by the comparison circuit 120. Illustratively, according to the principle of series resistor voltage division, for a normal sample (a normal SPI communication line, such as MOSI), since the trace resistance Rspi is small (<100 Ω), the detection voltage signal Vsense at the connection end of the tested SPI line and the pull-up resistor should be at a low level; when the circuit is abnormal and Rspi is increased, the detection voltage signal Vsense of the connection end of the detected SPI line and the pull-up resistor is raised; when the detection voltage signal Vsense at the connection end of the SPI line and the pull-up resistor to be tested is raised to the third high-low level flip threshold (for example, greater than the reference voltage signal Vref) of the comparison circuit 120, the level of the comparison result signal Vcmp is high, and at this time, it can be considered that the trace resistance has become greater than the threshold, so that the sample is determined to be a defective product.

The detection circuit of the embodiment of the utility model can comprise a plurality of pull-up resistors, namely, a plurality of SPI communication lower circuits can be synchronously detected, thereby improving the test efficiency.

Referring to fig. 2, fig. 2 is a block diagram of a circuit detecting device according to an embodiment of the utility model.

In a possible embodiment, as shown in fig. 2, the apparatus may further include:

a signal processing circuit 130, connected to the detection circuit 110, for preprocessing the detection voltage signal Vsense and outputting a processed detection voltage signal Vsense;

the comparison circuit 120 is connected to the signal processing circuit 130, and configured to compare the processed sense voltage signal Vsense with a reference voltage signal Vref, and output a comparison result signal Vcmp.

According to the embodiment of the utility model, the signal processing circuit is arranged to preprocess the detection voltage signal Vsense and output the processed detection voltage signal Vsense, so that the accuracy of line detection can be improved.

The signal processing circuit may include various implementations to implement processing manners such as amplification and filtering of the detected voltage signal, and the following describes an exemplary possible implementation manner of the signal processing circuit.

In one possible implementation, as shown in fig. 2, the signal processing circuit 130 includes:

an amplifying module 1310, configured to amplify the sense voltage signal Vsense to obtain an amplified sense voltage signal Vsense;

a filtering module 1320, connected to the amplifying module 1310, for filtering the amplified sense voltage signal Vsense to obtain the processed sense voltage signal Vsense.

According to the embodiment of the utility model, the detection voltage signal Vsense is amplified by the amplifying module, so that the condition of detection failure caused by a small detection voltage signal can be avoided, and the success rate of line detection is improved.

According to the embodiment of the utility model, the filtering module is arranged to filter the detection voltage signal, so that the interference of signals in other frequency bands can be shielded, and the accuracy of line detection is improved.

The embodiment of the present invention does not limit the specific implementation manners of the amplifying module 1310 and the filtering module 1320, and those skilled in the art may select a suitable circuit to implement according to actual situations and needs, and may also implement by using a mature amplifier and a mature filter. The following describes an exemplary possible implementation of the amplifying module 1310 and the filtering module 1320.

Referring to fig. 3, fig. 3 is a schematic diagram illustrating an amplifying unit of an amplifying circuit according to an embodiment of the utility model.

In one possible implementation, the amplifying module 1310 includes at least one stage of amplifying unit, as shown in fig. 3, which may include an operational amplifier Amp, a first amplifying resistor Ramp1, and a second amplifying resistor Ramp2, wherein,

a positive input end of the operational amplifier Amp is configured to receive the sense voltage signal Vsense, and an output end of the operational amplifier Amp is connected to a first end of the first amplifying resistor Ramp1 and configured to output the amplified sense voltage signal Vsense 1;

a negative input terminal of the operational amplifier Amp is connected to the second terminal of the first amplifying resistor Ramp1 and the first terminal of the second amplifying resistor Ramp2, and a second terminal of the second amplifying resistor Ramp2 is grounded.

The embodiment of the present invention may set the resistances of the first amplifying resistor Ramp1 and the second amplifying resistor Ramp2 to set the amplification factor of a single amplifying unit, and may set multiple stages of amplifying units to achieve higher amplification factor, where the setting of specific resistances and specific amplification factors of the first amplifying resistor Ramp1 and the second amplifying resistor Ramp2 are not limited in the embodiment of the present invention.

Referring to fig. 4, fig. 4 is a schematic diagram of a filter circuit according to an embodiment of the utility model.

In one possible implementation, as shown in fig. 4, the filtering module 1320 includes a filtering capacitor C and a filtering resistor RL, wherein,

the first end of the filter resistor RL and the first end of the filter capacitor C are both connected to the amplified detection voltage signal Vsense1, and the second end of the filter resistor RL and the second end of the filter capacitor C are both grounded.

Although the RC filter circuit is exemplarily described in the embodiment of the present invention, it should be understood that a person skilled in the art may also use other filter circuits such as an LC filter circuit to implement filtering, and the embodiment of the present invention is not limited thereto.

The above description is exemplary, and the signal processing circuit may further include other modules such as a voltage stabilizing module, which is not limited in the embodiments of the present invention.

The comparison circuit is exemplarily described below.

Referring to fig. 5, fig. 5 is a schematic diagram of a comparison circuit according to an embodiment of the utility model.

In one possible implementation, as shown in fig. 5, the comparison circuit 120 includes a comparator Cmp, a first comparison resistor Rcmp1, a second comparison resistor Rcmp2, and a third comparison resistor Rcmp3, wherein,

a first terminal of the first comparison resistor Rcmp1 is configured to receive the sense voltage signal Vsense, a second terminal of the first comparison resistor Rcmp1 is coupled to a first input terminal of the comparator Cmp,

a first terminal of the second comparison resistor Rcmp2 is configured to receive the reference voltage signal Vref, a second terminal of the second comparison resistor Rcmp2 is connected to a second input terminal of the comparator Cmp,

the output terminal of the comparator Cmp is connected to the first terminal of the third comparison resistor Rcmp3, and outputs the comparison result signal Vcmp,

the second end of the third comparison resistor Rcmp3 is used for receiving a power supply voltage (e.g., + V).

The embodiment of the utility model can comprise reading comparison circuits as described above to be matched with each pull-up resistor to realize synchronous detection of a plurality of SPI communication lines, thereby improving the detection efficiency.

In a possible embodiment, the apparatus may further include:

and a power supply circuit connected to the detection circuit 110 and the comparison circuit 120, for providing the first voltage signal Vdd, the second voltage signal Vgnd, and a reference voltage signal Vref of the comparison circuit 120.

The embodiment of the utility model does not limit the specific implementation manner of the power supply circuit, does not limit the specific implementation manner of the AC-DC module and/or the DC-DC module, and can be implemented by those skilled in the art according to actual situations and needs.

The embodiment of the utility model can quickly test whether the SPI communication line is normal or not, directly screen the abnormal module with the jumping point and jumping wire phenomenon, avoid flowing to the whole machine end and improve the screening success rate.

Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. The utility model provides a circuit detection device, its characterized in that, the device is used for detecting the SPI communication line of touch-control display module assembly, the device includes:

a device main body;

2. The apparatus of claim 1, further comprising:

3. The apparatus of claim 2, wherein the signal processing circuit comprises:

4. The apparatus of claim 3, wherein the amplifying module comprises at least one stage of amplifying unit, the amplifying unit comprising an operational amplifier, a first amplifying resistor, and a second amplifying resistor, wherein,

5. The apparatus of claim 3, wherein the filter module comprises a filter capacitor and a filter resistor, wherein,

6. The apparatus of claim 1, wherein the comparison circuit comprises a comparator, a first comparison resistor, a second comparison resistor, and a third comparison resistor, wherein,

7. The apparatus of claim 1, further comprising:

8. The apparatus of claim 7, wherein the power supply circuit comprises an AC-DC module and/or a DC-DC module.