CN109901046A - The voltage pin conduction detecting system and its method of circuit board - Google Patents
The voltage pin conduction detecting system and its method of circuit board Download PDFInfo
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- CN109901046A CN109901046A CN201711293094.6A CN201711293094A CN109901046A CN 109901046 A CN109901046 A CN 109901046A CN 201711293094 A CN201711293094 A CN 201711293094A CN 109901046 A CN109901046 A CN 109901046A
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- pin
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- circuit board
- detection
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Abstract
The present invention relates to the voltage pin conduction detecting systems and its method of a kind of circuit board, after JTAG chip is set as boundary scan operating mode, the read detection voltage value of analog-digital converter is obtained from single-chip microcontroller by JTAG chip by customized communication protocol, detection device reads detection voltage value from JTAG chip by JTAG connector to carry out the power pins conduction detection of circuit board to be tested, can reach the technical effect that power pins conduction detection can be all carried out in all voltage values whereby.
Description
Technical field
The present invention relates to the voltage pin conduction detecting system and its method of a kind of circuit board, refer in particular to it is a kind of by
JTAG chip, single-chip microcontroller and analog-digital converter are to carry out power pins conduction detecting system and its side of circuit board to be tested
Method.
Background technique
The detection of power pins in the circuit board, common mode are that power pins in circuit board are electrically connected to drop-down electricity
Resistance, by joint test working group (Joint Tes t Act ion Group, JTAG) chip with boundary scan (Boundary
Scan) in technology reading circuit plate power pins voltage value, thereby through from detection circuit board power pins read
Voltage value be high potential come whether judging in detection circuit board that power pins are connected.
For above-mentioned detection mode, if when the voltage value of power pins in detection circuit board is in 600mV feelings below
Condition, power pins are whether connected in detection circuit board, and JTAG chip power pins from detection circuit board are read
Voltage value is all low potential, leads to not detect whether power pins are connected in detection circuit board.
In summary, it is known that always exist existing power supply pin conduction detection for a long time in the prior art in low voltage value
Lead to the problem of detecting obstacle, it is therefore necessary to improved technological means is proposed, to solve the problems, such as this.
Summary of the invention
There are problems that existing power supply pin conduction detection causes to detect obstacle in low voltage value in view of the prior art, this
Invention illustrates the voltage pin conduction detecting system and its method of a kind of circuit board then, in which:
The voltage pin conduction detecting system of circuit board illustrated by the present invention, it includes: there is circuit board to be tested to connect
Circuit board to be tested, detection circuit board and the detection device of device are connect, wherein detection circuit board also includes: detection circuit board connection
Device, analog-digital converter (Analogtodigital converter, ADC), single-chip microcontroller (single-
Chipmicrocomputer), joint test working group (Joint Test Action Group, JTAG) chip and JTAG connect
Connect device.
The detection circuit connector for substrate of detection circuit board with circuit board connector to be tested to be electrically connected；Detection circuit
The voltage reading pin of the analog-digital converter of plate is electric with the power pins electric connection of detection circuit connector for substrate and with drop-down
Resistance is electrically connected, and the voltage of analog-digital converter reads the voltage value of power pins of the pin to read detection circuit connector for substrate
To detect voltage value；The voltage input pin of the single-chip microcontroller of detection circuit board and the voltage output pin of analog-digital converter electrically connect
It connects, single-chip microcontroller reads detection voltage value from the voltage output pin of analog-digital converter；The JTAG chip of detection circuit board is set
For boundary scan (Boundary Scan) operating mode, JTAG chip is electrically connected by customized communication protocol with single-chip microcontroller
It connects and receives detection voltage value from single-chip microcontroller；The JTAG connector of detection circuit board is connect with JTAG wafer electrical.
Detection device is electrically connected control JTAG chip by JTAG connector and is set as boundary scan operating mode,
And detection voltage value is read from JTAG chip to carry out the power pins conduction detection of circuit board to be tested by JTAG connector.
The voltage pin turn-on detecting method of circuit board illustrated by the present invention, it includes the following steps:
Firstly, provide have detection circuit connector for substrate, analog-digital converter (Analogtodigital converter,
ADC), single-chip microcontroller (s ingle-chip microcomputer), joint test working group (Joint Test Action
Group, JTAG) chip and JTAG connector detection circuit board；Then, detection circuit board passes through detection circuit connector for substrate
It is electrically connected with circuit board connector to be tested；Then, the voltage of analog-digital converter reads pin and detection circuit connector for substrate
Power pins be electrically connected and be electrically connected with pull down resistor, the voltage of analog-digital converter reads pin to read detection
The voltage value of the power pins of circuit board connector is detection voltage value；Then, the voltage input pin of single-chip microcontroller and modulus turn
The voltage output pin of parallel operation is electrically connected, and single-chip microcontroller reads detection voltage value from the voltage output pin of analog-digital converter；It connects
, JTAG chip is set to boundary scan (Boundary Scan) operating mode, and JTAG chip passes through customized communication protocols
View is electrically connected with single-chip microcontroller and receives detection voltage value from single-chip microcontroller；Then, JTAG connector is connect with JTAG wafer electrical；
Finally, provide detection device, detection device is electrically connected by JTAG connector to be controlled JTAG chip and is set as boundary and sweeps
Operating mode is retouched, and detection voltage value is read from JTAG chip by JTAG connector and is drawn with the power supply for carrying out circuit board to be tested
Foot conduction detection.
System and method illustrated by the present invention is as above, and the difference between the prior art is for JTAG chip to be set as
After boundary scan operating mode, analog-digital converter is obtained to be measured from single-chip microcontroller by JTAG chip by customized communication protocol
Try the read detection voltage value of circuit board, detection device by JTAG connector from JTAG chip read detection voltage value with into
The power pins conduction detection of row circuit board to be tested.
By above-mentioned technological means, the present invention, which can reach, can all carry out power pins conduction detection in all voltage values
Technical effect.
Detailed description of the invention
Fig. 1 shows the system block diagram of the voltage pin conduction detecting system of circuit board of the present invention.
Fig. 2 shows the method flow diagrams of the voltage pin turn-on detecting method of circuit board of the present invention.
Fig. 3 shows the system architecture diagram of the voltage pin conduction detecting system of circuit board of the present invention.
Fig. 4 shows the JTAG chip of the voltage pin conduction detection of circuit board of the present invention and the customized of single-chip microcontroller is led to
Believe agreement schematic diagram.
[reference signs list]
10 circuit boards to be tested
11 circuit board connectors to be tested
20 detection circuit boards
21 detection circuit connector for substrate
211 power pins
22 analog-digital converters
221 voltages read pin
222 voltage output pins
23 single-chip microcontrollers
231 voltage input pins
24 JTAG chips
25 JTAG connectors
30 detection devices
41 detection voltage values
42 pull down resistors
Specific embodiment
Carry out the embodiment that the present invention will be described in detail below in conjunction with schema and embodiment, how the present invention is applied whereby
Technological means solves technical problem and reaches the realization process of technical effect to fully understand and implement.
It will illustrate the present invention operating system and method implemented below with one embodiment, and please also refer to Fig. 1, figure
Shown in 2 and Fig. 3, Fig. 1 shows the system block diagram of the voltage pin conduction detecting system of circuit board of the present invention；Fig. 2 shows
The method flow diagram of the voltage pin turn-on detecting method of circuit board of the present invention；Fig. 3 shows the voltage of circuit board of the present invention
The system architecture diagram of pin conduction detecting system.
The voltage pin conduction detecting system of circuit board illustrated by the present invention, it includes: there is circuit board to be tested to connect
Circuit board to be tested 10, detection circuit board 20 and the detection device 30 of device 11 are connect, wherein detection circuit board 20 also includes: detection
Circuit board connector 21,22, single-chip microcontroller (single-chip analog-digital converter (Analogtodigital converter, ADC)
Microcomputer) 23, joint test working group (Joint Test Action Group, JTAG) chip 24 and JTAG connect
Connect 25 (step 101) of device.
The detection circuit connector for substrate 21 of detection circuit board 20 is to the circuit board to be tested with circuit board 10 to be tested
Connector 11 is electrically connected (step 102), and the voltage of the analog-digital converter 22 of detection circuit board 20 reads pin 221 and detection electricity
The power pins 211 of the detection circuit connector for substrate 21 of road plate 20 are electrically connected and are electrically connected with pull down resistor 42, detection
It is the detection circuit connector for substrate that detection circuit board 20 can be read that the voltage of the analog-digital converter 22 of circuit board 20, which reads pin 221,
The voltage value of 21 power pins 211 is detection 41 (step 103) of voltage value.
When the power pins wait try circuit board connector 11 of circuit board 10 to be tested are normally, detection circuit board
The voltage of 20 analog-digital converter 22, which reads pin 221, may be read into normal voltage value；When circuit board 10 to be tested to
The power pins of test circuit board connector 11 are when being not turned on, and the voltage reading of the analog-digital converter 22 of detection circuit board 20 is drawn
Foot 221 is 0 by the read voltage value of pull down resistor 42.
The analog-digital converter 22 of the voltage input pin 231 and detection circuit board 20 of the single-chip microcontroller 23 of detection circuit board 20
Voltage output pin 222 is electrically connected, and the single-chip microcontroller 23 of detection circuit board 20 can be turned by voltage input pin 231 from modulus
The voltage output pin 222 of parallel operation 22 reads detection 41 (step 104) of voltage value.
The JTAG chip 24 of detection circuit board 20 is set at boundary scan (Boundary Scan) operating mode, inspection
The JTAG chip 24 of slowdown monitoring circuit plate 20 is electrically connected simultaneously by the single-chip microcontroller 23 of customized communication protocol and detection circuit board 20
Detection 41 (step 105) of voltage value is received from the single-chip microcontroller 23 of detection circuit board 20.
It please refers to shown in Fig. 4, Fig. 4 shows the JTAG chip and monolithic of the voltage pin conduction detection of circuit board of the present invention
The customized communication protocol schematic diagram of machine.
It is made by oneself used between the JTAG chip 24 of detection circuit board 20 and the single-chip microcontroller 24 of detection circuit board 20
The communication protocol of justice is the load_cmd pin or load_data pin (load_ of the JTAG chip 24 of detection circuit board 20
Data pin is as backup pin) when being set as low potential, JTAG chip 24 generated 8 requests of detection circuit board 20
Order (8bit request command) for effective order, and the update (update) of the JTAG chip 24 of detection circuit board 20
When pin is set as high potential (high), the single-chip microcontroller 23 of detection circuit board 20 reads 8 request commands, detection from JTAG chip
The single-chip microcontroller 23 of circuit board 20 will test the busy_N pin shape of the single-chip microcontroller 23 of circuit board 20 after reading 8 request commands
State is set as effectively (setting 0 for busy_N pin, indicate that the receiving of single-chip microcontroller 23 of detection circuit board 20 instructs successfully), inspection
It is effective that the JTAG chip 24 of slowdown monitoring circuit plate 20, which further detects the busy_N pin state of the single-chip microcontroller 23 of detection circuit board 20,
When, the JTAG chip 24 of detection circuit board 20 again by load_cmd pin or load_data pin be set as high potential and
Pin will be updated and be set as low potential, the single-chip microcontroller 23 of detection circuit board 20 is executed according to 8 request commands from detection circuit board
After the voltage output pin 222 of 20 analog-digital converter 22 reads detection voltage value 41, the single-chip microcontroller 23 of detection circuit board 20 is set
Set includes 8 response datas (8bit response data) for detecting voltage value 41 and the single-chip microcontroller that will test circuit board 20
23 busy_N pin state is set as invalid and (sets 1 for busy_N pin, indicate the single-chip microcontroller 23 of detection circuit board 20
Completion instruction is executed, the single-chip microcontroller 23 of detection circuit board 20 is in idle state), the JTAG chip 24 of detection circuit board 20 is
Can read from the single-chip microcontroller 23 of detection circuit board 20 includes 8 response datas for detecting voltage value 41.
The JTAG chip 24 of above-mentioned detection circuit board 20 includes complex programmable logic device (complex
Programmable logic device, CPLD) and field programmable gate array (field programmable
Gate array, FPGA).
The JTAG chip 24 of above-mentioned detection circuit board 20 be by boundary scan technique control 8 request commands generation,
Control the potential setting of load_cmd pin or load_data pin, the potential setting and reading 8 of control update pin
Voltage value 41 is detected in response data.
It is worth noting that, 8 input and output pins of the JTAG chip 24 of detection circuit board 20 and detection circuit board 20
8 input and output pins of single-chip microcontroller 23 be electrically connected with each other each other, so as to transmission 8 request commands and 8 sound
Answer data.
The JTAG connector 25 of detection circuit board 20 and the JTAG chip 24 of detection circuit board 20 are electrically connected (step
106), and detection device 30 is electrically connected by the JTAG connector 25 with detection circuit board 20 to control detection circuit
The JTAG chip 24 of plate 20 is set as boundary scan operating mode, and by the JTAG connector 25 of detection circuit board 20 from detection
The JTAG chip 24 of circuit board 20 reads detection voltage value 41 to carry out the power pins conduction detection (step of circuit board 10 to be tested
It is rapid 107), i.e., when detection device 30 from the JTAG chip 24 of detection circuit board 20 read detection voltage value 41 be normal voltage value
When, indicate that the power pins of circuit board 10 to be tested are positive normally on, when 30 self-detection circuit plate 20 of detection device
When the reading detection voltage value 41 of JTAG chip 24 is 0, indicate that the power pins of circuit board 10 to be tested are not on-state.
In summary, it is known that the difference between the present invention and the prior art is JTAG chip being set as boundary scan work
After operation mode, analog-digital converter is obtained from circuit board institute to be tested from single-chip microcontroller by JTAG chip by customized communication protocol
The detection voltage value of reading, detection device read detection voltage value from JTAG chip by JTAG connector to carry out electricity to be tested
The power pins conduction detection of road plate.
Existing power supply pin conduction detection present in the prior art can be solved in low voltage value by this technological means
Lead to the problem of detecting obstacle, and then reaches the technical effect that can all carry out power pins conduction detection in all voltage values.
Although embodiment illustrated by the present invention is as above, only the content is not of the invention special directly to limit
Sharp protection scope.Any the technical staff in the technical field of the invention is not departing from spirit illustrated by the present invention and model
Under the premise of enclosing, a little change can be made in the formal and details of implementation.Scope of patent protection of the invention, still must be with
Subject to appended claims institute defender.
Claims (10)
1. a kind of voltage pin conduction detecting system of circuit board, it includes:
Circuit board to be tested, the circuit board to be tested have circuit board connector to be tested；And
Detection circuit board, the detection circuit board also includes:
Detection circuit connector for substrate, the detection circuit connector for substrate with the circuit board connector to be tested electrically to connect
It connects；
Analog-digital converter, the voltage of the analog-digital converter read the power pins electricity of pin and the detection circuit connector for substrate
Property connection and be electrically connected with pull down resistor, the voltage of the analog-digital converter reads pin to read the detection circuit
The voltage value of the power pins of connector for substrate is detection voltage value；
The voltage output pin of single-chip microcontroller, the voltage input pin of the single-chip microcontroller and the analog-digital converter is electrically connected, institute
It states single-chip microcontroller and reads the detection voltage value from the voltage output pin of the analog-digital converter；
Joint test working group chip, the JTAG chip are set to boundary scan operating mode, and the JTAG chip passes through
Customized communication protocol and the single-chip microcontroller are electrically connected and receive the detection voltage value from the single-chip microcontroller；
JTAG connector, the JTAG connector are connect with the JTAG wafer electrical；
Detection device, the detection device are electrically connected the control JTAG chip by the JTAG connector and are set as
Boundary scan operating mode, and the detection voltage value is read from the JTAG chip to carry out institute by the JTAG connector
State the power pins conduction detection of circuit board to be tested.
2. the voltage pin conduction detecting system of circuit board as described in claim 1, which is characterized in that the JTAG chip with
Customized communication protocol used in the single-chip microcontroller is that the load_cmd pin of the JTAG chip or load_data draw
When foot is set as low potential, JTAG chip 8 request commands generated are effective order, and the JTAG chip is more
When new pin is set as high potential, the single-chip microcontroller reads 8 request commands from the JTAG chip, and the single-chip microcontroller is being read
It sets the busy_N pin state of the single-chip microcontroller to effectively after to 8 request commands, it is single described in the JTAG wafer inspection
When the busy_N pin state of piece machine is effective, the JTAG chip again sets load_cmd pin or load_data pin
It is set to high potential and pin will be updated and be set as low potential, the single-chip microcontroller is executed according to 8 request commands from the modulus
After the voltage output pin of converter reads the detection voltage value, the single-chip microcontroller setting includes the detection voltage
It 8 response datas of value and sets the busy_N pin state of the single-chip microcontroller in vain, the JTAG chip can be from institute
Stating single-chip microcontroller and reading includes 8 response datas for detecting voltage value.
3. the voltage pin conduction detecting system of circuit board as claimed in claim 2, which is characterized in that the JTAG chip is
The generation of 8 request commands is controlled by boundary scan technique, controls the current potential of load_cmd pin or load_data pin
Setting, control, which update the potential setting of pin and read, detects voltage value described in 8 response datas.
4. the voltage pin conduction detecting system of circuit board as claimed in claim 2, which is characterized in that the JTAG chip
8 input and output pins of 8 input and output pins and the single-chip microcontroller are electrically connected with each other each other, so as to transmission 8
Request command and 8 response datas.
5. the voltage pin conduction detecting system of circuit board as described in claim 1, which is characterized in that the JTAG chip packet
Containing complex programmable logic device and field programmable gate array.
6. a kind of voltage pin turn-on detecting method of circuit board, it includes:
The circuit board to be tested for having circuit board connector to be tested is provided；
There is provided has detection circuit connector for substrate, analog-digital converter, single-chip microcontroller, joint test working group chip and JTAG connection
The detection circuit board of device；
The detection circuit board is electrically connected by the detection circuit connector for substrate and the circuit board connector to be tested；
The power pins that the voltage of the analog-digital converter reads pin and the detection circuit connector for substrate be electrically connected and
It is electrically connected with pull down resistor, the voltage of the analog-digital converter reads pin to read the detection circuit connector for substrate
The voltage value of power pins is detection voltage value；
The voltage output pin of the voltage input pin of the single-chip microcontroller and the analog-digital converter is electrically connected, the single-chip microcontroller
The detection voltage value is read from the voltage output pin of the analog-digital converter；
The JTAG chip is set to boundary scan operating mode, and the JTAG chip passes through customized communication protocol and institute
Single-chip microcontroller is stated to be electrically connected and receive the detection voltage value from the single-chip microcontroller；
The JTAG connector is connect with the JTAG wafer electrical；And
Detection device is provided, the detection device is electrically connected the control JTAG chip by the JTAG connector and sets
Be set to boundary scan operating mode, and by the JTAG connector from the JTAG chip read the detection voltage value with into
The power pins conduction detection of the row circuit board to be tested.
7. the voltage pin turn-on detecting method of circuit board as claimed in claim 6, which is characterized in that the JTAG chip with
Customized communication protocol used in the single-chip microcontroller is that the load_cmd pin of the JTAG chip or load_data draw
When foot is set as low potential, JTAG chip 8 request commands generated are effective order, and the JTAG chip is more
When new pin is set as high potential, the single-chip microcontroller reads 8 request commands from the JTAG chip, and the single-chip microcontroller is being read
It sets the busy_N pin state of the single-chip microcontroller to effectively after to 8 request commands, it is single described in the JTAG wafer inspection
When the busy_N pin state of piece machine is effective, the JTAG chip again sets load_cmd pin or load_data pin
It is set to high potential and pin will be updated and be set as low potential, the single-chip microcontroller is executed according to 8 request commands from the modulus
After the voltage output pin of converter reads the detection voltage value, the single-chip microcontroller setting includes the detection voltage
It 8 response datas of value and sets the busy_N pin state of the single-chip microcontroller in vain, the JTAG chip can be from institute
Stating single-chip microcontroller and reading includes 8 response datas for detecting voltage value.
8. the voltage pin turn-on detecting method of circuit board as claimed in claim 7, which is characterized in that the JTAG chip is
The generation of 8 request commands is controlled by boundary scan technique, controls the current potential of load_cmd pin or load_data pin
Setting, control, which update the potential setting of pin and read, detects voltage value described in 8 response datas.
9. the voltage pin turn-on detecting method of circuit board as claimed in claim 7, which is characterized in that the JTAG chip
8 input and output pins of 8 input and output pins and the single-chip microcontroller are electrically connected with each other each other, so as to transmission 8
Request command and 8 response datas.
10. the voltage pin turn-on detecting method of circuit board as claimed in claim 6, which is characterized in that the JTAG chip
Include complex programmable logic device and field programmable gate array.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711293094.6A CN109901046B (en) | 2017-12-08 | 2017-12-08 | Voltage pin conduction detection system and method of circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711293094.6A CN109901046B (en) | 2017-12-08 | 2017-12-08 | Voltage pin conduction detection system and method of circuit board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109901046A true CN109901046A (en) | 2019-06-18 |
| CN109901046B CN109901046B (en) | 2021-04-06 |
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ID=66940246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711293094.6A Active CN109901046B (en) | 2017-12-08 | 2017-12-08 | Voltage pin conduction detection system and method of circuit board |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11435400B1 (en) * | 2021-06-15 | 2022-09-06 | Inventec (Pudong) Technology Corporation | Test coverage rate improvement system for pins of tested circuit board and method thereof |
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| CN102353867A (en) * | 2011-06-08 | 2012-02-15 | 伟创力电子技术(苏州)有限公司 | Interconnection test equipment and method |
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|---|---|
| CN109901046B (en) | 2021-04-06 |
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