CN103852709A - Test system and method of circuit board function and electronic component on circuit board - Google Patents
Test system and method of circuit board function and electronic component on circuit board Download PDFInfo
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- CN103852709A CN103852709A CN201210496161.5A CN201210496161A CN103852709A CN 103852709 A CN103852709 A CN 103852709A CN 201210496161 A CN201210496161 A CN 201210496161A CN 103852709 A CN103852709 A CN 103852709A
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Abstract
A test system and method of a circuit board function and electronic component on a circuit board are discloses. A signal conversion circuit board can be used to simulate data and protocols needed to test different electronic components on the circuit board, and to simulate data and communication protocols needed to test different circuit functions on the circuit board, so that the technical effect that the electronic component and circuit board function on the circuit board can be rapidly and simply tested is realized.
Description
Technical field
The present invention relates to a kind of detection system and method thereof, relate in particular to a kind of system and the method thereof of electronic component and circuit board Function detection on circuit board.
Background technology
In the hardware composition of server, often with circuit board compositions such as motherboard, backboard (SASBP), fan control circuitry plate (FCB), power control circuit plates (PDB), and for the functional test of each circuit board, existing way is the Embedded testing apparatus of exploitation.
And adopt embedded system for testing apparatus, conventionally design meeting more complicated, need the aspect considered a lot, for example: need to design hardware circuit, reserved good hardware interface, select chip, Design PCB, flog, the overall operation of hardware all needs to consider.
Then the program of development system upper and lower computer, the cost of developing the software and hardware of this testing apparatus can be very high, the hardware interface function (for example: the interfaces such as IIC, GPIO, SPI, SGPIO) of testing apparatus and number needs will just be reserved in the time of design, if in the future interface not or need expansion, probably need HardwareUpgring, cost further rises, when later maintenance, also can run into slave computer firmware (firmware) edition upgrading etc., the cost of cost is continuous and high.
Therefore due to the complexity of design, the operation of realization is many, and the maintenance in later stage, makes the exploitation of testing apparatus very expensive.
In sum, since known prior art is medium-term and long-term, exist electronic component and circuit board Functional Design on testing circuit plate to develop difficult problem always, be therefore necessary to propose improved technological means, solve this problem.
Summary of the invention
Because prior art exists electronic component and circuit board Functional Design on testing circuit plate to develop difficult problem, the present invention discloses a kind of system and the method thereof of electronic component and circuit board Function detection on circuit board then, wherein:
The system of electronic component and circuit board Function detection on the disclosed circuit board of the present invention, it comprises: signal controlling end, signaling conversion circuit plate and testing circuit plate, wherein: signaling conversion circuit plate also comprises: signal transmission interface, boundary scanning chip (Boundary Scan Chip, BS chip) and multiple detection connecting interface.
Signal controlling end is detection information is provided and judges testing result; The signal transmission interface of signaling conversion circuit plate is in order to form and to be electrically connected with signal controlling end, and obtains detection information from signal control end, and provides testing result to signal controlling end; The boundary scanning chip of signaling conversion circuit plate and signal transmission interface form and are electrically connected, boundary scanning chip has multiple data transmission pins, according to boundary scan (Boundary Scan) technology, detection information is pushed to the data transmission pin of appointment by the boundary scan chain in boundary scanning chip (Boundary Scan Chain), with push the testing result of data transmission pin of specifying to test data output pin (Test Data Output, TDO) and be electrically connected to signal transmission interface; Multiple detection connecting interfaces of signaling conversion circuit plate are electrically connected with the data transmission pin that boundary scanning chip is specified respectively, and each detects detection information and the transmission testing result of connecting interface in order to the data transmission pin of transmission appointment; Testing circuit plate and one of them electric connection of detection connecting interface, and the detection connecting interface being certainly electrically connected obtains detection information, to carry out the detection of electronic component and circuit board function in testing circuit plate according to detection information, and by detecting connecting interface feedback testing result.
The method of electronic component and circuit board Function detection on the disclosed circuit board of the present invention, it comprises the following step:
First, the signal transmission interface of signaling conversion circuit plate and signal controlling end form and are electrically connected, and obtain detection information from signal control end; Then, the boundary scanning chip of signaling conversion circuit plate and signal transmission interface form and are electrically connected, boundary scanning chip has multiple data transmission pins, according to boundary scan technique, detection information is pushed to the data transmission pin of appointment by the boundary scan chain in boundary scanning chip; Then, multiple detection connecting interfaces of signaling conversion circuit plate are electrically connected with the data transmission pin that boundary scanning chip is specified respectively, and each detects the detection information of connecting interface in order to the data transmission pin of transmission appointment; Then, testing circuit plate and one of them electric connection of detection connecting interface, and the detection connecting interface being certainly electrically connected obtains detection information, to carry out the detection of electronic component and circuit board function in testing circuit plate according to detection information, and feed back testing result by detecting connecting interface; Then, testing result is pushed to test data output pin and is electrically connected to signal transmission interface by the boundary scan chain in boundary scanning chip, to be provided testing result to signal controlling end by signal transmission interface; Finally, signal controlling end judges testing result.
The disclosed System and method for of the present invention as above, and the difference between prior art is, the present invention pushes to detection information the data transmission pin of appointment according to boundary scan technique by the boundary scanning chip of signaling conversion circuit plate, can detection information be provided to testing circuit plate by corresponding detection connecting interface, testing circuit plate is to carry out the detection of electronic component and circuit board function in testing circuit plate according to detection information, and by detecting connecting interface feedback testing result, can simulate the needed data of detection and the agreement of different electronic components on testing circuit plate by signaling conversion circuit plate, and the different circuit functions that simulate testing circuit plate are tested needed data and communication protocol, effectively promote the detection efficiency of testing circuit plate and avoid the degree of difficulty of detection hardware design.
By above-mentioned technological means, the present invention can reach fast and simple detection circuit board on the technique effect of electronic component and circuit board function.
Accompanying drawing explanation
Fig. 1 is shown the system block diagrams of electronic component and circuit board Function detection on circuit board of the present invention.
Fig. 2 is shown the method flow diagram of electronic component and circuit board Function detection on circuit board of the present invention.
Fig. 3 is shown the system architecture schematic diagram of electronic component and circuit board Function detection on circuit board of the present invention.
Critical piece Reference numeral:
10 signal controlling ends
20 signaling conversion circuit plates
21 signal transmission interfaces
22 boundary scanning chips
23 detect connecting interface
231 first detect connecting interface
232 second detect connecting interface
233 the 3rd detect connecting interface
30 testing circuit plates
31 first connecting interfaces
32 cresset control elements
33 second connecting interfaces
34 decode element
35 the 3rd connecting interfaces
40 interface conversion connectors
41 first detection information
42 second detection information
43 testing results
The signal transmission interface of step 110 signaling conversion circuit plate and signal controlling end form and are electrically connected, and obtain detection information from signal control end
The boundary scanning chip of step 120 signaling conversion circuit plate and signal transmission interface form and are electrically connected, boundary scanning chip has multiple data transmission pins, according to boundary scan technique, detection information is pushed to the data transmission pin of appointment by the boundary scan chain in boundary scanning chip
Multiple detection connecting interfaces of step 130 signaling conversion circuit plate are electrically connected with the data transmission pin that boundary scanning chip is specified respectively, and each detects the detection information of connecting interface in order to the data transmission pin of transmission appointment
Embodiment
Describe embodiments of the present invention in detail below with reference to drawings and Examples, thus the present invention's implementation procedure how application technology means solve technical matters and reach technique effect can be fully understood and be implemented according to this.
First the system of electronic component and circuit board Function detection on circuit board of the present invention below will be described, and please refer to shown in Fig. 1, Fig. 1 is shown the system block diagrams of electronic component and circuit board Function detection on circuit board of the present invention.
The system of electronic component and circuit board Function detection on the disclosed circuit board of the present invention, it comprises: signal controlling end 10, signaling conversion circuit plate 20 and testing circuit plate 30, wherein: signaling conversion circuit plate 20 more comprises: signal transmission interface 21, boundary scanning chip 22 and multiple detection connecting interface 23.
Above-mentioned in the time that signal controlling end 10 is the signal transmission interface 21 by joint test working group interface and signaling conversion circuit plate 20, not needing to carry out any interface conversion can form electric connection by signal controlling end 10 and the signal transmission interface 21 of signaling conversion circuit plate 20; And in the time that signal controlling end 10 is the signal transmission interface 21 by USB (universal serial bus) and signaling conversion circuit plate 20, need by interface conversion connector 40 the USB (universal serial bus) of parallel transmission is converted to the joint test working group interface of serial transmission, signal controlling end 10 can provide detection information by the signal transmission interface of signaling conversion circuit plate 20 21.
The boundary scanning chip 22 of signaling conversion circuit plate 20 is to support JTAG1149.1 standard, and the existing JTAG1149.1 of support standard for example has Intel80386TM and the above processor of Intel80486, 68040 microprocessors of motorola inc, the above Series FPGA of XC3000 of Xilinx company, the C40 series DSP chip of TexasInstruction company, the Alpha 21164 serial risc chips of DEC etc., and the boundary scanning chip 22 of signaling conversion circuit plate 20 can be electronics erasable programmable read-only chip (Electrically-Erasable Programmable Read-Only Memory, EEPROM), nonvolatile random access memory (Non-Volatile Random Access Memory) or flash memory (Flash Memory), at this only for illustrating, do not limit to application category of the present invention with this.
Multiple detection connecting interfaces 23 of signaling conversion circuit plate 20 are electrically connected with the data transmission pin that the boundary scanning chip 22 of signaling conversion circuit plate 20 is specified respectively, thus in the time that the boundary scanning chip 22 of signaling conversion circuit plate 20 obtains detection information, can detection information be pushed to by boundary scan technique to the data transmission pin of appointment by the boundary scan chain in the boundary scanning chip 22 of signaling conversion circuit plate 20, simulate thus the needed data of detection and the agreement of electronic component on testing circuit plate 30, and the circuit function that simulates testing circuit plate 30 is tested needed data and communication protocol, and can detection information be exported by the detection connecting interface 23 of signaling conversion circuit plate 20.
The detection connecting interface 23 of above-mentioned signaling conversion circuit plate 20 comprises internal integrated circuit (Inter-Integrated Circuit, IIC) interface, universal input and output (General Purpose I/O, GPIO) interface, Serial Peripheral Interface (SPI) (Serial Peripheral Interface, and the universal input and output of serial (Serial General Purpose I/O SPI), SGPIO) interface, only for illustrating, do not limit to application category of the present invention with this at this.
Detection connecting interface 23 one of them electric connection of testing circuit plate 30 and signaling conversion circuit plate 20, and testing circuit plate 30 obtains power supply supply by the detection connecting interface 23 of signaling conversion circuit plate 20, testing circuit plate 30 can obtain detection information from the detection connecting interface 23 being electrically connected, obtain the needed data of detection and the agreement that simulate electronic component on testing circuit plate 30, and the circuit function that simulates testing circuit plate 30 is tested needed data and communication protocol, testing circuit plate 30 can carry out according to detection information the detection of electronic component and circuit board function in testing circuit plate 30, and feed back testing result by the detection connecting interface 23 of signaling conversion circuit plate 20.
At the boundary scanning chip 22 of signaling conversion circuit plate 20 after the detection connecting interface 23 of signaling conversion circuit plate 20 obtains testing result, the testing result that can push the data transmission pin of specifying by the boundary scan chain in boundary scanning chip is to test data output pin, and test data output pin can be electrically connected with the signal transmission interface of signaling conversion circuit plate 20 21.
Certainly in the time that signal controlling end 10 is the signal transmission interface 21 by joint test working group interface and signaling conversion circuit plate 20, do not need to carry out any interface conversion and signal controlling end 10 and the signal transmission interface 21 of signaling conversion circuit plate 20 can be formed to electric connection, and can directly provide the testing result of serial form to signal controlling end 10 by the signal transmission interface 21 of signaling conversion circuit plate 20, signal controlling end 10 can judge testing result, to carry out the detection of electronic component and circuit board function in testing circuit plate 30.
And in the time that signal controlling end 10 is the signal transmission interface 21 by USB (universal serial bus) and signaling conversion circuit plate 20, need by interface conversion connector 40 the USB (universal serial bus) of parallel transmission is converted to the joint test working group interface of serial transmission, the testing result of the serial form that the signal transmission interface 21 of signaling conversion circuit plate 20 provides can be converted to by interface conversion connector 40 testing result of parallel form, just can provide to signal controlling end 10, signal controlling end 10 can judge testing result, to carry out the detection of electronic component and circuit board function in testing circuit plate 30.
The needed data of detection and the agreement that can simulate different electronic components on testing circuit plate 30 by above-mentioned signaling conversion circuit plate 20, and the different circuit functions that simulate testing circuit plate 30 are tested needed data and communication protocol, the degree of difficulty that effectively promotes the detection efficiency of testing circuit plate 30 and avoid detection hardware to design.
Then, below will explain orally function mode of the present invention and flow process with an embodiment, following embodiment explanation describes the while shown in Fig. 1 and Fig. 2, and Fig. 2 is shown the method flow diagram of electronic component and circuit board Function detection on circuit board of the present invention.
Shown in Fig. 3, Fig. 3 is shown the system architecture schematic diagram of electronic component and circuit board Function detection on circuit board of the present invention.
With the boundary scanning chip 22 (step 120) that according to boundary scan technique, the signal transmission interface of signaling conversion circuit plate 20 21 is electrically connected to signaling conversion circuit plate 20, the boundary scanning chip 22 of signaling conversion circuit plate 20 is using chip " EPM1270 " as realizing, and the first data transmission pin 140 to data transmission pin 143 that detects connecting interface 231 and boundary scanning chip 22 of signaling conversion circuit plate 20 is electrically connected (step 130); Second detects connecting interface 232 is electrically connected (step 130) with data transmission pin 150 to the data transmission pin 152 of boundary scanning chip 22; The 3rd detects connecting interface 233 is electrically connected (step 130) with data transmission pin 153 to the data transmission pin 160 of boundary scanning chip 22 respectively; And first of signaling conversion circuit plate 20 detects connecting interface 231, the second detection connecting interface 232 and the 3rd detection connecting interface 233 and can be electrically connected with power supply respectively, can detect connecting interface 231, the second detection connecting interface 232 and the 3rd detection connecting interface 233 by first of signaling conversion circuit plate 20 power supply of testing circuit plate 30 is provided.
The first connecting interface 31 of testing circuit plate 30 detects connecting interface 231 with first of signaling conversion circuit plate 20 and is electrically connected (step 140), and the first connecting interface 31 of testing circuit plate 30 is electrically connected with the cresset control element 32 of testing circuit plate 30; The second connecting interface 33 of testing circuit plate 30 detects connecting interface 232 with second of signaling conversion circuit plate 20 and is electrically connected (step 140), and the second connecting interface 33 of testing circuit plate 30 is electrically connected with the decode element 34 of testing circuit plate 30; The 3rd connecting interface 35 of testing circuit plate 30 detects connecting interface 233 with the 3rd of signaling conversion circuit plate 20 and is electrically connected (step 140), and the 3rd connecting interface 35 of testing circuit plate 30 is electrically connected with the decode element 34 of testing circuit plate 30.
By signal controlling end 10 by interface conversion connector 40 so that the first detection information 41 of serial form and the second detection information 42 signal transmission interface 21 (step 110) to signaling conversion circuit plate 20 to be provided.
The data transmission pin 140 that the boundary scanning chip 22 of signaling conversion circuit plate 20 can push to boundary scanning chip 22 by the first detection information 41 by the boundary scan chain in the boundary scanning chip 22 of signaling conversion circuit plate 20 by boundary scan technique by the first detection information 41 is to data transmission pin 143 (step 120), can detect connecting interface 231 by first of signaling conversion circuit plate 20 and provide the first connecting interface 31 (step 130) to testing circuit plate 30 by the first detection information 41, and the cresset control element 32 of testing circuit plate 30 can carry out the control of cresset according to the first detection information 41, by judging that the demonstration correctness of cresset can carry out the detection (step 140) of electronic component and circuit board function in testing circuit plate 30.
The data transmission pin 150 that the boundary scanning chip 22 of signaling conversion circuit plate 20 can push to boundary scanning chip 22 by the second detection information 42 by the boundary scan chain in the boundary scanning chip 22 of signaling conversion circuit plate 20 by boundary scan technique by the second detection information 42 is to data transmission pin 152 (step 120), can detect connecting interface 232 by second of signaling conversion circuit plate 20 and provide the second connecting interface 33 (step 130) to testing circuit plate 30 by the second detection information 42, and the decode element 34 of testing circuit plate 30 can be carried out the decoding of the decode element 34 of testing circuit plate 30 according to the second detection information 42, and by the i.e. decoded result of the second detection information 42 of testing result 43() feed back to the 3rd of signaling conversion circuit plate 20 by the 3rd connecting interface 35 of testing circuit plate 30 and detect connecting interface 233 (step 140).
The 3rd of signaling conversion circuit plate 20 detects connecting interface 233 after obtaining testing result 43, can push the data transmission pin 153 of specifying to the testing result 43 of data transmission pin 160 to test data output pin by the boundary scan chain in boundary scanning chip 20, and can by interface conversion connector 40, the testing result of serial form 43 be converted to again to the testing result 43 of parallel form, for the testing result 43 of parallel form to signal controlling end 10 (step 150), signal controlling end 10 can judge (step 160) to testing result 43, to carry out the detection of electronic component and circuit board function in testing circuit plate 30.
The needed data of detection and the agreement that can simulate different electronic components on testing circuit plate 30 by above-mentioned signaling conversion circuit plate 20, and the different circuit functions that simulate testing circuit plate 30 are tested needed data and communication protocol, the degree of difficulty that effectively promotes the detection efficiency of testing circuit plate 30 and avoid detection hardware to design.
In sum, difference between known the present invention and prior art is, the present invention pushes to detection information the data transmission pin of appointment according to boundary scan technique by the boundary scanning chip of signaling conversion circuit plate, can detection information be provided to testing circuit plate by corresponding detection connecting interface, testing circuit plate is to carry out the detection of electronic component and circuit board function in testing circuit plate according to detection information, and by detecting connecting interface feedback testing result, can simulate the needed data of detection and the agreement of different electronic components on testing circuit plate by signaling conversion circuit plate, and the different circuit functions that simulate testing circuit plate are tested needed data and communication protocol, effectively promote the detection efficiency of testing circuit plate and avoid the degree of difficulty of detection hardware design.
Can solve electronic component and circuit board Functional Design on the existing testing circuit plate of prior art by this technological means and develop difficult problem, and then reach fast and the technique effect of electronic component and circuit board function on simple detection circuit board.
Although the disclosed embodiment of the present invention as above, but described content is not in order to direct restriction scope of patent protection of the present invention.Any those skilled in the art of the invention, are not departing under the prerequisite of the disclosed spirit and scope of the present invention, can do some changes what implement in form and in details.Scope of patent protection of the present invention, still must be as the criterion with the content that claims were limited.
Claims (10)
1. a system for electronic component and circuit board Function detection on circuit board, is characterized in that, comprises:
Signal controlling end, in order to provide detection information and to judge testing result;
Signaling conversion circuit plate, described signaling conversion circuit plate also comprises:
Signal transmission interface, in order to form and to be electrically connected with described signal controlling end, and obtains described detection information from described signal controlling end, and provides described testing result to described signal controlling end;
Boundary scanning chip, described boundary scanning chip and described signal transmission interface form and are electrically connected, described boundary scanning chip has multiple data transmission pins, according to boundary scan technique, described detection information is pushed to the data transmission pin of appointment by the boundary scan chain in described boundary scanning chip, and push the described testing result of data transmission pin of specifying to test data output pin and be electrically connected to described signal transmission interface; And
Multiple detection connecting interfaces, each detects connecting interface and is electrically connected with the data transmission pin that described boundary scanning chip is specified respectively, and each detects connecting interface in order to transmit the described detection information of the described data transmission pin of specifying and to transmit described testing result; And
Testing circuit plate, described testing circuit plate and one of them electric connection of detection connecting interface, and the detection connecting interface being certainly electrically connected obtains described detection information, to carry out the detection of electronic component and circuit board function in described testing circuit plate according to described detection information, and feed back described testing result by described detection connecting interface.
2. the system of electronic component and circuit board Function detection on circuit board as claimed in claim 1, it is characterized in that, on described circuit board, the system of electronic component and circuit board Function detection also comprises interface conversion connector, in order to the interface conversion between described signal controlling end and described signal transmission interface to be provided.
3. the system of electronic component and circuit board Function detection on circuit board as claimed in claim 1, is characterized in that, described signal transmission interface is joint test working group interface.
4. the system of electronic component and circuit board Function detection on circuit board as claimed in claim 1, it is characterized in that, described detection connecting interface comprises internal integrated circuit interface, universal IO interface, Serial Peripheral Interface (SPI) and the universal IO interface of serial.
5. the system of electronic component and circuit board Function detection on circuit board as claimed in claim 1, is characterized in that, described signaling conversion circuit plate provides the supply of described testing circuit plate power supply by described detection connecting interface.
6. a method for electronic component and circuit board Function detection on circuit board, is characterized in that, comprises the following step:
The signal transmission interface of signaling conversion circuit plate and signal controlling end form and are electrically connected, and obtain described detection information from described signal controlling end;
The boundary scanning chip of described signaling conversion circuit plate and described signal transmission interface form and are electrically connected, described boundary scanning chip has multiple data transmission pins, according to boundary scan technique, described detection information is pushed to the data transmission pin of appointment by the boundary scan chain in described boundary scanning chip;
Multiple detection connecting interfaces of described signaling conversion circuit plate are electrically connected with the data transmission pin that described boundary scanning chip is specified respectively, and each detects the described detection information of connecting interface in order to the described data transmission pin of transmission appointment;
Testing circuit plate and one of them electric connection of detection connecting interface, and the detection connecting interface being certainly electrically connected obtains described detection information, to carry out the detection of electronic component and circuit board function in described testing circuit plate according to described detection information, and feed back testing result by described detection connecting interface;
Described testing result is pushed to test data output pin and is electrically connected to described signal transmission interface by the boundary scan chain in described boundary scanning chip, to be provided described testing result to described signal controlling end by described signal transmission interface; And
Described signal controlling end judges described testing result.
7. the method for electronic component and circuit board Function detection on circuit board as claimed in claim 6, it is characterized in that, it is by interface conversion connector that the described signal transmission interface of described signaling conversion circuit plate and described signal controlling end form the step being electrically connected, to carry out the interface conversion between this circuit board connecting interface and this control end connecting interface.
8. the method for electronic component and circuit board Function detection on circuit board as claimed in claim 6, it is characterized in that, the described signal transmission interface of described signaling conversion circuit plate and described signal controlling end, and obtain in the step of described detection information from described signal controlling end, described signal transmission interface is joint test working group interface.
9. the method for electronic component and circuit board Function detection on circuit board as claimed in claim 6, it is characterized in that, multiple detection connecting interfaces of described signaling conversion circuit plate are electrically connected with the data transmission pin that described boundary scanning chip is specified respectively, each detects in the step of connecting interface in order to the described detection information of the described data transmission pin of transmission appointment, and described detection connecting interface comprises internal integrated circuit interface, universal IO interface, Serial Peripheral Interface (SPI) and the universal IO interface of serial.
10. the method for electronic component and circuit board Function detection on circuit board as claimed in claim 6, it is characterized in that, described testing circuit plate and one of them electric connection of detection connecting interface, and the detection connecting interface being certainly electrically connected obtains described detection information, also comprising described signaling conversion circuit plate with the step of carrying out the detection of electronic component in described testing circuit plate according to described detection information provides the step of described testing circuit plate power supply supply by described detection connecting interface.
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| CN201210496161.5A CN103852709A (en) | 2012-11-28 | 2012-11-28 | Test system and method of circuit board function and electronic component on circuit board |
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| CN201210496161.5A CN103852709A (en) | 2012-11-28 | 2012-11-28 | Test system and method of circuit board function and electronic component on circuit board |
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| CN106918726A (en) * | 2015-12-24 | 2017-07-04 | 英业达科技有限公司 | Suitable for the test circuit plate of serial ATA connector |
| CN106918750A (en) * | 2015-12-24 | 2017-07-04 | 英业达科技有限公司 | Suitable for the test circuit plate of memory bank |
| CN106918771A (en) * | 2015-12-24 | 2017-07-04 | 英业达科技有限公司 | Suitable for the test circuit plate of universal serial bus connector |
| CN106918725A (en) * | 2015-12-25 | 2017-07-04 | 英业达科技有限公司 | Tool joint test work group signal concatenates the test circuit plate of circuit design |
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| CN108614205A (en) * | 2016-12-12 | 2018-10-02 | 英业达科技有限公司 | Have the test circuit plate and its self-detection method of self detecting function |
| CN109901045A (en) * | 2017-12-08 | 2019-06-18 | 英业达科技有限公司 | The connector plugging slot pin conduction detecting system and its method of circuit board |
| CN109901046A (en) * | 2017-12-08 | 2019-06-18 | 英业达科技有限公司 | The voltage pin conduction detecting system and its method of circuit board |
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Application publication date: 20140611 |