CN106771823A - Camera module open-short circuit device, system - Google Patents
Camera module open-short circuit device, system Download PDFInfo
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- CN106771823A CN106771823A CN201710066220.8A CN201710066220A CN106771823A CN 106771823 A CN106771823 A CN 106771823A CN 201710066220 A CN201710066220 A CN 201710066220A CN 106771823 A CN106771823 A CN 106771823A
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- pin
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention provides a kind of camera module open-short circuit device, system, device therein includes that main control chip, first switch enable chip, second switch and enable chip, the 3rd switch enable chip and constant-current source；Main control chip sends the first enable signal and enables chip to first switch, and first switch enables chip controls constant-current source and is connected with camera module；Main control chip sends the second enable signal and enables chip to second switch enable chip and the 3rd switch, and second switch enables the pin to be detected of chip controls first and is connected with camera module, and the 3rd switchs the enable pin to be detected of chip controls second and be systematically connected；Wherein first pin to be detected is a pin to be detected of current detection, and the second pin to be detected is remaining pin to be detected；Main control chip reads the voltage of the first pin to be detected, and opens short-circuit condition according to what voltage determined the first pin to be detected, and all pins to be detected can be accurately and efficiently detected in order opens short-circuit condition.
Description
Technical field
The present invention relates to detection field, more particularly to a kind of camera module open-short circuit device, system.
Background technology
In camera module testing field, often encounter module point and do not work or other abnormal conditions, at this moment staff's meeting
The pin of test analysis camera module opens short-circuit state, and traditional mode is to be tested with universal meter, and which is using PIN one by one
Pin test comparison in turn, inefficiency, easily erroneous judgement, while pin to compare density test also extremely inconvenient.
The content of the invention
For in the prior art cannot efficiently and accurately test camera module pin the technical problem for opening short-circuit condition, carry
A kind of camera module open-short circuit device, system are supplied.
The invention provides a kind of camera module open-short circuit device, described device includes main control chip, first switch
Enable chip, second switch and enable chip, the 3rd switch enable chip and constant-current source；
Output end and the camera module ground of the constant-current source enable chip and are connected with the first switch respectively, and described the
One switch enables chip and is connected with the main control chip, and the main control chip sends the first enable signal to be made to the first switch
Can chip, output end and shooting mould of the first switch enable chip according to the described first enable signal control constant-current source
The connection of group ground；
The second switch enables chip with the main control chip, each pin to be detected of camera module and camera module ground
Connection, the 3rd switch enables chip and the main control chip, each pin to be detected of camera module and is systematically connected；Institute
State main control chip and send the second enable signal to second switch enable chip and the 3rd switch enable chip, described second
Switch enables chip and controls the first pin to be detected to be connected with camera module according to the described second enable signal, and second is to be detected
Pin is not connected with camera module, and it is to be detected according to the described second enable signal control second that the 3rd switch enables chip
Pin is connected with systematically, first pin to be detected not be systematically connected；Wherein first pin to be detected is current inspection
The pin to be detected surveyed, the second pin to be detected is the pin in addition to the first pin to be detected in the pin to be detected；
Main control chip pin to be checked each with camera module is connected, and the main control chip reading described first is to be detected to draw
The voltage of pin, and open short-circuit condition according to what the voltage determined the described first pin to be detected.
Preferably, the main control chip includes that pin changes unit, and the pin changes unit to be used to be treated described in one
After detection pin detection is finished, the described first pin to be detected is replaced by the pin described to be detected that other do not detect one
Individual pin.
Preferably, the main control chip also includes memory cell, and the memory cell is described to be detected for storing each
Pin opens short-circuit condition.
Preferably, the memory cell includes several registers.
Preferably, the main control chip also includes status determining unit；
Whether the status determining unit judges the voltage more than or equal to open circuit predetermined voltage, if so, then described the
One pin to be detected is open-circuit condition；If the voltage is less than the open circuit predetermined voltage, the status determining unit judges
Whether the voltage is less than or equal to short-circuit predetermined voltage, if so, then the described first pin to be detected is short-circuit condition, otherwise,
First pin to be detected is normal connection status.
Preferably, three switch enables chip includes several transistors.
Preferably, the main control chip is CY8C3866AXI-040 chips.
Preferably, it is FST3125MTC14 that the first switch enables chip and/or the second enable chip.
The invention also discloses a kind of camera module open-short circuit system, the system includes said apparatus and signaling
Transmitter；
The signaling sender sends and starts to enable signaling to described device, and described device is according to the enable signaling detection
Camera module each pin to be detected opens short-circuit condition.
Preferably, described device is communicated with signaling sender using the communication modes of I2C.
As shown from the above technical solution, the present invention provides a kind of camera module open-short circuit device, system, dress therein
Put and enable chip, second switch enable chip, the 3rd switch enable chip and constant-current source including main control chip, first switch；
Main control chip sends the first enable signal and enables chip to first switch, and first switch enables the output end of chip controls constant-current source
It is connected with camera module；Main control chip sends second and enables signal to second switch enable chip and the 3rd switch enable core
Piece, second switch enables the pin to be detected of chip controls first and is connected with camera module, and the 3rd switchs enable chip controls the
Two pins to be detected be systematically connected；Wherein first pin to be detected is a pin to be detected of current detection, and second is to be checked
It is the pin in pin to be detected in addition to the first pin to be detected to survey pin；Main control chip reads the electricity of the first pin to be detected
Pressure, and short-circuit condition is opened according to what voltage determined the first pin to be detected, opening for all pins to be detected is can detect in order
Short-circuit condition, it is seen that what the device efficiently can accurately test each pin to be detected opens short-circuit condition.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these figures.
Fig. 1 is the connection circuit diagram of the constant-current source with first switch enable chip of a preferred embodiment of the invention；
Fig. 2 is that the 3rd switch of a preferred embodiment of the invention enables chip and main control chip, the connection of camera module
Circuit diagram；
Fig. 3 is that the second switch of a preferred embodiment of the invention enables chip and main control chip, the connection of camera module
Circuit diagram；
Fig. 4 is the connection circuit diagram of the camera module of a preferred embodiment of the invention；
Fig. 5 is the connection circuit diagram of the main control chip of a preferred embodiment of the invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
A kind of camera module open-short circuit device, described device includes that main control chip, first switch enable chip, second
Switch enables chip, the 3rd switch and enables chip and constant-current source.
Output end and the camera module ground of the constant-current source enable chip and are connected with the first switch respectively, and described the
One switch enables chip and is connected with the main control chip, and the main control chip sends the first enable signal to be made to the first switch
Can chip, output end and shooting mould of the first switch enable chip according to the described first enable signal control constant-current source
The connection of group ground.Preferably, the chip of the use model LM334 of constant-current source, first switch enables chip and uses model
The chip of FST3125MTC14, as shown in Figure 1,5, the 1A pins that the output end of constant-current source enables chip with first switch are connected,
The 1B pins that camera module ground enables chip with first switch are connected, and first switch enables chip Enable Pin OE1 and main control chip
One output end is connected, and main control chip sends the first enable signal and enables chip to first switch, and first switch enables chip to be made to draw
Pin 1A and 1B are connected, that is, the output end for stating constant-current source is connected with camera module.
The second switch enables chip with the main control chip, each pin to be detected of camera module and camera module ground
Connection, the 3rd switch enables chip and the main control chip, each pin to be detected of camera module and is systematically connected.Institute
State main control chip and send the second enable signal to second switch enable chip and the 3rd switch enable chip, described second
Switch enables chip and controls the first pin to be detected to be connected with camera module according to the described second enable signal, and second is to be detected
Pin is not connected with camera module, and it is to be detected according to the described second enable signal control second that the 3rd switch enables chip
Pin is connected with systematically, first pin to be detected not be systematically connected；Wherein first pin to be detected is current inspection
The pin to be detected surveyed, the second pin to be detected is the pin in addition to the first pin to be detected in the pin to be detected.
The pin to be detected of wherein camera module has SGND, AVDD, DVDD, DOVDD, AFVDD, RESET, PWDN, MCLK, MIPI to believe
Number, I2C signals etc..
Preferably, the 3rd switch enables chip includes several transistors, and model 2N7002, each pin to be detected is equal
Correspondence one transistor, using transistor controls pin to be detected whether be systematically connected.Second switch enables chip and uses
The chip of model FST3125MTC14.The main control chip is CY8C3866AXI-040 chips.It is brilliant as shown in Fig. 2,3,4,5
The base stage of body pipe connects an output end of main control chip, and the colelctor electrode of transistor is connected with pin to be detected, the transmitting of transistor
Machine is connected with systematically, and the signal that the output end of main control chip sends being capable of controlling transistor turn-on and turn-off, i.e. main control chip
By transistor controls pin to be detected whether be systematically connected.Second switch enables each Enable Pin and master control core of chip
The output end connection of piece, such as OE2 is connected with an output end of main control chip, and whether each switch controls each pin to be detected respectively
Whether it is connected with camera module ground, such as 2A and 2B are connected with DVDD, SGND respectively, pin DVDD to be detected is controlled using OE2
Whether it is connected with camera module ground SGND.
Be can see from Fig. 2 and Fig. 3, the break-make of the output end output signal control transistor of main control chip and second opened
The closure or disconnection for enabling each way switch in chip are closed, so that realized when a certain pin to be detected is detected by main control chip,
The pin for detecting is set to be connected with SGND, other pins are connected with systematically.
Main control chip pin to be checked each with camera module is connected, and the main control chip reading described first is to be detected to draw
The voltage of pin, and open short-circuit condition according to what the voltage determined the described first pin to be detected.
Wherein judge that opening short-circuit condition is specially：
Main control chip includes status determining unit；The status determining unit judges whether the voltage is more than or equal to and opens
Road predetermined voltage, if so, then the described first pin to be detected is open-circuit condition；If the voltage is less than the predetermined electricity of the open circuit
Press, then whether the status determining unit judges the voltage less than or equal to short-circuit predetermined voltage, if so, then described first treating
Detection pin is short-circuit condition, and otherwise, the first pin to be detected is normal connection status.
Said apparatus can detect all pins to be detected and open short-circuit condition in order, efficiently can accurately test each
Individual pin to be detected opens short-circuit condition.
Further, the main control chip includes that pin changes unit, and the pin changes unit to be used for described in one
After pin detection to be detected is finished, the described first pin to be detected is replaced by the pin described to be detected that other are not detected
One pin.It will be appreciated by those skilled in the art that, oneself of all pins to be detected is realized by pin replacing unit
Dynamic detection, as long as being to be capable of achieving using corresponding program.
Further, the main control chip also includes memory cell, and the memory cell is described to be checked for storing each
That surveys pin opens short-circuit condition.The memory cell includes several registers.Each one register of pin correspondence to be detected,
Short-circuit condition is opened using corresponding register storage pin to be detected.
Said apparatus after test instruction is received by pin to be measured and camera module SGND be connected, accident pin and system
Ground GND is connected, and SGND does not connect with GND, while providing, 250uA constant-current sources are to ADC and will be connected with SGND, main control chip measures this
Voltage under pin this state, and open circuit predetermined voltage with setting, short-circuit predetermined voltage contrast, you can draw opening for the pin
Short-circuit opens short-circuit conditions, tests in order successively, you can quick and precisely go out each pin opens short-circuit condition.
The invention also discloses a kind of camera module open-short circuit system, the system includes said apparatus and signaling
Transmitter；The signaling sender sends and starts to enable signaling to described device, and described device is according to the enable signaling detection
Camera module each pin to be detected opens short-circuit condition.Only needing a test instruction can read to have surveyed all pins to be detected soon
Open short-circuit condition.
Described device is communicated with signaling sender using the communication modes of I2C, I2C address flexibility and changeabilities, is kept away
Exempt from and other equipment address conflict.
The application method of said system is illustrated below by one embodiment.
The present embodiment is illustrated as a example by detecting the switch line state of pin DVDD to be detected.
S1, the I2C addresses for setting camera module open-short circuit device, can when I2C is communicated
With direct index to the device；
S2, the state of each pin to be detected is appointed as a corresponding register；
S3, when the device I2C communication receive test instruction after, control SEL_CURRENT signal I/O ports LM334 is provided
250uA constant-current source pin signals and camera module ground SGND connect together；
S4, the pin to be detected in addition to DVDD are systematically connected together with test, and the ground of DVDD and camera module is connected
Together, then the voltage Vdvdd of DVDD pins is read with the ADC functions of main control chip；
S5, the open circuit predetermined voltage Vopen that Vdvdd and system are set, short-circuit predetermined voltage Vshort voltages are contrasted,
Conventional Vopen is set to 1V by us, and Vshort is set to 200mV.
Vdvdd≥Vopen：Now DVDD pin opens state is illustrated, value is set to 0x00；
Vdvdd≤Vshort：Now DVDD pins short-circuit condition is illustrated, value is set to 0x01；
Vshort<Vdvdd<Vopen：Illustrate that now DVDD pins are in normal connection status, value is set to 0x02；
S6, the value tested in the 5th step is saved in the register that the 2nd step is specified, then successively by the 4th step and the 5th step
In reading the opening short-circuit condition and preserve respective register of other pins.
It is measured by the register and corresponding value of the device each pin after the completion of the test of all pins
Camera module each pin to be detected opens short-circuit condition.
One of ordinary skill in the art will appreciate that：Realizing all or part of step of above method embodiment can lead to
Cross the related hardware of programmed instruction to complete, foregoing program can be stored in the storage medium of embodied on computer readable, the journey
Sequence upon execution, performs the step of including above method embodiment.
In specification of the invention, numerous specific details are set forth.It is to be appreciated, however, that embodiments of the invention can be with
Put into practice in the case of without these details.In some instances, known method, structure and skill is not been shown in detail
Art, so as not to obscure the understanding of this description.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
The present invention has been described in detail, it will be understood by those within the art that；It still can be to foregoing each implementation
Technical scheme described in example is modified, or carries out equivalent to which part technical characteristic；And these modification or
Replace, do not make the spirit and scope of the essence disengaging various embodiments of the present invention technical scheme of appropriate technical solution.
Claims (10)
1. a kind of camera module open-short circuit device, it is characterised in that described device includes that main control chip, first switch are enabled
Chip, second switch enable chip, the 3rd switch and enable chip and constant-current source；
Output end and the camera module ground of the constant-current source enable chip and are connected with the first switch respectively, and described first opens
Close enable chip to be connected with the main control chip, the main control chip sends the first enable signal and enables core to the first switch
Piece, the first switch enables chip and enables output end and camera module ground that signal controls the constant-current source according to described first
Connection；
The second switch enables chip with the main control chip, each pin to be detected of camera module and camera module even
Connect, the 3rd switch enables chip and the main control chip, each pin to be detected of camera module and is systematically connected；It is described
Main control chip sends second and enables signal to second switch enable chip and the 3rd switch enable chip, and described second opens
Close and enable chip and control the first pin to be detected to be connected with camera module according to the described second enable signal, second to be detected draws
Pin is not connected with camera module, and the 3rd switch enables chip and to be detected drawn according to the described second enable signal control second
Pin is connected with systematically, first pin to be detected not be systematically connected；Wherein first pin to be detected is current detection
A pin to be detected, the second pin to be detected is the pin in addition to the first pin to be detected in the pin to be detected；
Main control chip pin to be checked each with camera module is connected, and the main control chip reads first pin to be detected
Voltage, and open short-circuit condition according to what the voltage determined the described first pin to be detected.
2. device according to claim 1, it is characterised in that the main control chip includes that pin changes unit, described to draw
Pin changes unit to be used for after a pin detection to be detected is finished, and the described first pin to be detected is replaced by into other not
A pin in the pin described to be detected of detection.
3. device according to claim 1, it is characterised in that the main control chip also includes memory cell, the storage
What unit was used to storing each pin to be detected opens short-circuit condition.
4. device according to claim 3, it is characterised in that the memory cell includes several registers.
5. device according to claim 1, it is characterised in that the main control chip also includes status determining unit；
Whether the status determining unit judges the voltage more than or equal to open circuit predetermined voltage, if so, then described first treating
Detection pin is open-circuit condition；If the voltage is less than the open circuit predetermined voltage, the status determining unit judges described
Whether voltage is less than or equal to short-circuit predetermined voltage, if so, then the described first pin to be detected is short-circuit condition, otherwise, first
Pin to be detected is normal connection status.
6. device according to claim 1, it is characterised in that three switch enables chip includes several transistors.
7. device according to claim 1, it is characterised in that the main control chip is CY8C3866AXI-040 chips.
8. device according to claim 1, it is characterised in that the first switch enables chip and/or second enables core
Piece is FST3125MTC14.
9. a kind of camera module open-short circuit system, it is characterised in that the system includes any one of claim 1 to 8 institute
The device and signaling sender stated；
The signaling sender sends and starts to enable signaling to described device, and described device is according to the enable signaling detection shooting
Module each pin to be detected opens short-circuit condition.
10. device according to claim 9, it is characterised in that described device and signaling sender using I2C communication side
Formula is communicated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710066220.8A CN106771823A (en) | 2017-02-06 | 2017-02-06 | Camera module open-short circuit device, system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710066220.8A CN106771823A (en) | 2017-02-06 | 2017-02-06 | Camera module open-short circuit device, system |
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| Publication Number | Publication Date |
|---|---|
| CN106771823A true CN106771823A (en) | 2017-05-31 |
Family
ID=58955293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201710066220.8A Pending CN106771823A (en) | 2017-02-06 | 2017-02-06 | Camera module open-short circuit device, system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108594105A (en) * | 2018-02-07 | 2018-09-28 | 深圳微步信息股份有限公司 | The detection method of mainboard indication lamp control circuit |
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| CN101949990A (en) * | 2010-09-25 | 2011-01-19 | 苏州华芯微电子股份有限公司 | IC pin open short circuit test method |
| CN103076530A (en) * | 2012-12-28 | 2013-05-01 | 昆山丘钛微电子科技有限公司 | Automatic open short circuit test system for CMOS (Complementary Metal-Oxide-Semiconductor Transistor) chip and test method |
| CN103543368A (en) * | 2012-07-16 | 2014-01-29 | 华润赛美科微电子(深圳)有限公司 | Open/short test method and open/short test machine for integrated circuits |
| CN103698654A (en) * | 2013-12-28 | 2014-04-02 | 珠海全志科技股份有限公司 | Open circuit short circuit test device and test method of chip base pin |
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2017
- 2017-02-06 CN CN201710066220.8A patent/CN106771823A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101949990A (en) * | 2010-09-25 | 2011-01-19 | 苏州华芯微电子股份有限公司 | IC pin open short circuit test method |
| CN103543368A (en) * | 2012-07-16 | 2014-01-29 | 华润赛美科微电子(深圳)有限公司 | Open/short test method and open/short test machine for integrated circuits |
| CN103076530A (en) * | 2012-12-28 | 2013-05-01 | 昆山丘钛微电子科技有限公司 | Automatic open short circuit test system for CMOS (Complementary Metal-Oxide-Semiconductor Transistor) chip and test method |
| CN103698654A (en) * | 2013-12-28 | 2014-04-02 | 珠海全志科技股份有限公司 | Open circuit short circuit test device and test method of chip base pin |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108594105A (en) * | 2018-02-07 | 2018-09-28 | 深圳微步信息股份有限公司 | The detection method of mainboard indication lamp control circuit |
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Application publication date: 20170531 |