CN207039796U - A kind of camera module detects circuit - Google Patents

Abstract

The utility model discloses a kind of camera module to detect circuit, and the detection circuit includes：Usb interface module, protocol communication module, sampling module, control chip and power transfer module；Power transfer module is connected with usb interface module, protocol communication module, sampling module and control chip respectively, the input power of usb interface module is converted into system working power, it is supplied to protocol communication module, sampling module and control chip, and the Power convert for inputting usb interface module is protocol communication power supply, there is provided gives protocol communication module；Control chip is connected with usb interface module, protocol communication module and sampling module respectively, to receive the detection control instruction of host computer and return to testing result to host computer, whether the EEROM for detecting camera module is normal, whether the driving chip for detecting camera module is normal, thus need not rely on imaging sensor, it can as early as possible pinpoint the problems, reduce the fraction defective of product.

Description

A kind of camera module detects circuit

Technical field

Camera module technical field is the utility model is related to, more particularly to a kind of camera module detection circuit.

Background technology

With the rapid development of image sensor technologies, the camera of the high pixel such as 13,000,000 pixels has turned into mobile phone etc. and set Standby basic configuration.Along with the continuous improvement of camera pixel, sensor combined with PCB support plates after flatness, skew will Seek also more and more higher.The mode of traditional SMT (surface mounting technology) welding image sensor can not meet to image head mould Group is for flatness, the requirement of skew.Present imaging sensor is using COB (Chip On Board) encapsulation, WB (wire Bond, routing bonding) mode turns into conventional process.It is for the COB camera module technological process of productions encapsulated：(1)SMT Welding-(2) Die Bond-(3) Wire Bond-(4) module functional test.

For the camera of high pixel, generally AF (Auto Focus) types are, it is necessary to which Drive IC drive voice coil motor Motion.In addition, need to store Debugging message and the customized information of other clients of camera etc. for such module, typically Will additional EEROM (electrically erasable read-only memory).The generally CSP such as EEROM, Drive IC (Chip Scale Package, Chip size packages) technique, it is necessary to SMT weld.

It was found from technological process：Camera module needs first to weld EEROM, Drive IC and resistor-capacitor unit etc., Ran Houcai It is to imaging sensor DB and WB.EEROM, Drive IC of module are required for function to confirm in test manufacture or batch production, keep away Exempt from mistake occur.And existing camera module test platform, all it is to need imaging sensor just to can confirm that EEROM after working on power And whether Drive IC work is normal, and at this moment product has all been completed, if there is mistake, phase and life are handed over to product Production expense has an impact larger.Therefore, the utility model proposes one kind can after SMT welds initial workpiece just can to EEROM and The device that Drive IC are detected, to pinpoint the problems as early as possible, reduce economic loss.

Utility model content

In view of prior art camera module detection platform is needed by after imaging sensor is assembled, making image sensing Device works on power the problem of could detecting EEROM and Drive IC functions, it is proposed that a kind of camera module of the present utility model Circuit is detected, to overcome above mentioned problem or to solve the above problems at least in part.

To achieve these goals, the utility model employs following technical scheme：

A kind of camera module detects circuit, and the detection circuit includes：Usb interface module, protocol communication module, sampling mould Block, control chip and power transfer module；

The power transfer module respectively with the usb interface module, protocol communication module, sampling module and control chip Connection, is converted to system working power, there is provided to the protocol communication module, adopt by the input power of the usb interface module Egf block and control chip, and the Power convert that the usb interface module is inputted are protocol communication power supply, there is provided to described Protocol communication module；

The usb interface module, protocol communication module and sampling module are connected with the control chip respectively；The control Chip is communicated by the usb interface module with host computer, is received the detection control instruction of host computer and is returned to host computer and is examined Result is surveyed, is communicated by the protocol communication module with camera module, whether just to detect the EEROM of the camera module Often, by the driving current of the sampling module acquisition camera module, detect the camera module driving chip whether Normally.

In summary, the beneficial effects of the utility model are：

Camera module of the present utility model detects circuit, using control chip as core, is connected with what is communicated with host computer Usb interface module, to receive the detection control instruction of host computer and return to testing result to host computer；It is connected with and shooting head mould Whether the protocol communication module of group communication is normal to detect the EEROM of camera module；It is connected with the driving of acquisition camera module The sampling module of electric current, it is whether normal to detect the driving chip of camera module, thus imaging sensor is needed not rely on, energy It is enough to realize detection after SMT welds initial workpiece, pinpoint the problems as early as possible, reduce the fraction defective of product.

Brief description of the drawings

Fig. 1 is the composition frame chart that a kind of camera module that the utility model one embodiment provides detects circuit；

Fig. 2 is that a kind of camera module that the utility model one embodiment provides detects control chip signal in circuit Figure；

Fig. 3 is that usb interface module shows in a kind of camera module detection circuit that the utility model one embodiment provides It is intended to；

Fig. 4 is that power transfer module is shown in a kind of camera module detection circuit that the utility model one embodiment provides It is intended to；

Fig. 5 is that a kind of camera module that the utility model one embodiment provides detects each power supply of control chip in circuit The filter circuit schematic diagram at end；

Fig. 6 is that SWD interface modules are shown in a kind of camera module detection circuit that the utility model one embodiment provides It is intended to；

Fig. 7 is that a kind of camera module that the utility model one embodiment provides detects starting module signal in circuit Figure；

Fig. 8 is that a kind of camera module that the utility model one embodiment provides detects indicating module signal in circuit Figure；

Fig. 9 is that a kind of camera module that the utility model one embodiment provides detects sampling module signal in circuit Figure；

Figure 10 is that SPI interface module is shown in a kind of camera module detection circuit that the utility model one embodiment provides It is intended to；

Figure 11 is that IIC interface modules are shown in a kind of camera module detection circuit that the utility model one embodiment provides It is intended to.

Embodiment

It is new to this practicality below in conjunction with accompanying drawing to make the purpose of this utility model, technical scheme and advantage clearer Type embodiment is described in further detail.

Technical concept of the present utility model is：Using control chip as core, the USB interface mould to be communicated with host computer is connected The sampling module of block, the protocol communication module to be communicated with camera module and acquisition camera module driving current, and it is aided with phase The power transfer module answered realizes power supply, so as to be communicated with host computer and camera module to be measured, and utilizes sampling module The driving current of camera module is sampled, thus needs not rely on imaging sensor, can be after SMT welds initial workpiece Detection is realized, pinpoints the problems as early as possible, reduces the fraction defective of product.

Fig. 1 is that a kind of camera module of the utility model one embodiment offer detects the composition frame chart of circuit, such as Fig. 1 Shown, a kind of camera module detects circuit, and the detection circuit includes：Usb interface module 110, protocol communication module 130, adopt Egf block 150, control chip 120 and power transfer module 140.

Power transfer module 140 respectively with usb interface module 110, protocol communication module 130, sampling module 150 and control Chip 120 connects, and the input power of usb interface module 110 is converted into system working power, there is provided give protocol communication module 130th, sampling module 150 and control chip 120, and the Power convert that usb interface module 110 is inputted are protocol communication electricity Source, there is provided to protocol communication module 130.

Usb interface module 110, protocol communication module 130 and sampling module 150 are connected with control chip 120 respectively；Control Chip 120 is communicated by usb interface module 110 with host computer, is received the detection control instruction of host computer and is returned to host computer Testing result, for example, being gathered to Drive IC output currents and preserving data, host computer is shown to according to data matched curve. Control chip 120 is also communicated by protocol communication module 130 with camera module, whether just to detect the EEROM of camera module Often, for example, simulation camera module course of normal operation, writes into EEROM or this reads data out of EEROM, detection should Whether EEROM is normal.Control chip 120 also by the driving current of the acquisition camera module of sampling module 150, detects camera Whether the driving chip of module is normal.

Fig. 2-Figure 11 respectively illustrates the circuit connection diagram of each part of this camera module detection circuit, ginseng Examine shown in Fig. 2-Figure 11, wherein, Fig. 2 shows the schematic diagram of control chip in this camera module detection circuit embodiments, such as Shown in Fig. 2, for the control chip 120 using the STM32 chips U2 of ARM cores as control core, the kernel of control chip 120 is ARM 32bit Cortex-M3, processing speed is fast, and chip is designed with the abundant peripheral hardware such as IIC, SPI, USB, ADC, simplifies electricity Road is designed, and reduces design cost.

Fig. 3 is that the utility model camera module detects usb interface module schematic diagram in circuit embodiments, as shown in figure 3, In some embodiments of the utility model, the usb interface module 110 includes：USB connector CN1, impedance matching resistor R1 and R2, ground capacity C8 and grounding resistance R5, USB connector CN1 power end VCC are connected to the input of power transfer module 140, USB connector CN1 earth terminal GND ground connection, USB connector CN1 two differential signal end D- and D+ are respectively through impedance matching Resistance R1 connects the corresponding end of control chip 120 with R2, realizes USB2.0 differential lines impedance matching, and it is anti-to reduce system signal Penetrate, improve system rejection to disturbance ability；Ground capacity C8 and grounding resistance R5 further carries the USB connector CN1 earthing of casing High USB antijamming capabilities.In the present embodiment, the USB peripheral that is carried using STM32, USB interface is designed, such as USB2.0 interfaces, led to Believe that speed is fast, and be conveniently connected with host computer, facilitate the interface of host computer customization hommization, display the details of in camera module EEROM and Drive IC working condition.Also, it can detect circuit for this camera module by the USB2.0 interfaces to provide not Operating current more than 500mA, thus this detection circuit is without external power adapter.

Fig. 4 is the power transfer module schematic diagram that the utility model camera module detects circuit embodiments, such as Fig. 4 institutes Show, in some embodiments of the utility model, the power transfer module 140 includes：Offer system working power+3.3V's is System working power converting unit, and protocol communication power vd D_IIC protocol communication power conversion unit is provided；System works Power conversion unit includes voltage conversion chip U1 and filter capacitor C1-C3, and protocol communication power conversion unit turns including voltage Change chip U2 and filter capacitor C4-C6, the input power electric capacity C1 and C3 ground connection filter after filtering respectively of usb interface module 110 After ripple, photovoltaic conversion chip U1 and U2 input VIN and Enable Pin-SHDN are connected to, photovoltaic conversion chip U1's and U2 is defeated Going out to hold VOUT, electric capacity C2, C3 and C5, C6 are grounded after filtering respectively, photovoltaic conversion chip U1 and U2 earth terminal GND ground connection.When So, the size and number of filter capacitor can be depending on power conditions, at least provided with one.Pass through the power transfer module 140, the input power of usb interface module can be converted to system working power+3.3V, for the normal work such as STM32 chips Make, the input power of usb interface module can also be converted to protocol communication power vd D_IIC, so as to be supplied to IIC interface moulds Block, it is adapted to camera module to be measured and uses, because the IIC communication voltages of different camera modules are inconsistent, Ke Nengwei 1.8V, 2.8V or 3.3V, therefore, here size limitation is not done to protocol communication power supply, this detection can be welded by changing The voltage conversion chip U2 of circuit, to provide the IIC protocol communication voltages being accordingly adapted to, with the shooting of compatible different communication voltage Head mould group.

Preferably, in some embodiments of the present application, the power transfer module 140 is additionally provided with electric indicating circuit, As shown in figure 4, on this electric indicating circuit include be connected on system working power and systematically between resistance R4 and light-emitting diodes Pipe D1, by making luminous realize of light emitting diode D1 indicate the upper electricity of this test circuit.

Fig. 5 is the filtered electrical that the utility model camera module detects supporting each power end of control chip in circuit embodiments Road schematic diagram, with reference to referring to figs. 2 and 5.In some embodiments of the utility model, multiple numeral electricity of control chip 120 Source VBAT, VDD_1, VDD_2, VDD_3, VDD_4 and an analog power end VDDA be connected to system working power+ 3.3V, and isolation resistance R10 is in series between multiple digital power ends and an analog power end and realizes that single-point connects, to prevent Digital power and analog power crosstalk；Each digital power end is grounded through a filter capacitor, i.e. digital power end VBAT, Filtered electric capacity C9-C14 is grounded successively by VDD_1, VDD_2, VDD_3, VDD_4；Analog power end VDDA is through two filters in parallel Ripple electric capacity C15, C16 are grounded, and one is to filter out High-frequency Interference in filter capacitor C15 and C16, and another is to filter out low-frequency disturbance, So that analog power end VDDA voltage is more stable, so that the analog sampling input of STM32 control chips can be accurate Ground gathers the driving current information of camera module driving chip to be detected.Pass through the filter circuit shown in Fig. 5, it is possible to achieve Power filter and the digital simulation isolation of STM32 control chips, there is provided the working power stable to STM32 control chips and sampling Power supply.

Fig. 6 be the utility model camera module detect circuit embodiments in SWD interface modules schematic diagram as shown in fig. 6, The detection circuit also includes the SWD interface modules for burning program, and the SWD interface modules include connector J1, connector J1 Power end IIC_VCC be connected to system working power+3.3V, connector J1 earth terminal GND ground connection, connector J1 data terminal SDA and clock end SCL are connected with the corresponding end of control chip 120, are downloaded by serial mode for STM32.

Fig. 7 is that the utility model camera module detects starting module schematic diagram in circuit embodiments, as shown in fig. 7, should Detection circuit also includes being used for the starting module for controlling the Starting mode of control chip 120, and the starting module includes the first startup and connected Meet device J2 and second and start connector J3, first, which starts connector J2 and second, which starts connector J3, includes power end, ground connection End and output end (BOOT0 and BOOT1), power end connection system working power, earth terminal ground connection, output end by jumper cap with A connection in power end and earth terminal, the first startup connector J2 and the second startup connector J3 output end connect respectively One startup control terminal of control chip 120, it is possible to achieve the switching of tetra- kinds of Starting mode of STM32.

Fig. 8 is to indicate module diagram in the utility model camera module detection circuit embodiments, as shown in figure 8, should Detection circuit also includes being used for the indicating module for indicating testing result, and the indicating module includes normal indicating member (on the left of Fig. 8) With fault indication unit (Fig. 8 on the right side of), the two structure is identical, normal indicating member include light emitting diode D2, protective resistance R6, R8 and triode Q1, fault indication unit includes light emitting diode D3, protective resistance R7, R9 and triode Q2, normally to indicate Exemplified by unit, light emitting diode D2 positive pole is connected to system working power, negative pole connecting triode Q1 through a protective resistance R6 Colelctor electrode, triode Q1 grounded emitter, triode Q1 base stage is connected to control chip 120 through a protective resistance R8 Normal outcome output end.And the difference of fault indication unit is that triode Q2 base stage is connected to through a protective resistance R9 The fail result output end of control chip 120.Normal indicating member and the triode D2 and D3 of fault indication unit can be used not Same color, such as it is respectively green or red, in order to distinguish.

Fig. 9 is that the utility model camera module detects sampling module schematic diagram in circuit embodiments, as shown in figure 9, should Sampling module 150 includes：Sampling connector J5 and sampling resistor R11；Sampling connector J5 earth terminal ground connection；Sampling connector The J5 sampled resistance R11 ground connection of sampling end, sampling end and sampling resistor R11 connection are connected to the sampling of control chip 120 Input, this sampling resistor R11 need to select resistance high-power resistance, instead of load of the voice coil motor as Drive IC, control Coremaking piece STM32 enclosed insides have the analog-digital converter of 12, by gathering the pressure drop on this resistance R11 so as to obtaining Drive IC output currents.

Figure 10 is that the utility model camera module detects SPI interface module diagram in circuit embodiments, such as Figure 10 institutes Show, protocol communication module 130, including SPI interface module, SPI interface module include SPI connectors J4, SPI connector J4 electricity Source connects system operating voltage, and SPI connectors J4 MOSI ends, MISO ends, SCK ends and CE ends connect control chip respectively 120 corresponding end, realize SPI protocol communicate, from or holotype under, the traffic rate of full and half duplex is up to 18,000,000 Bps, SPI connectors J4 also leave standby electricity source, power backup end connection protocol communication power supply VDD_IIC, to provide The voltage of another size is standby.

Figure 11 is that the utility model camera module detects IIC interface module schematic diagrames in circuit embodiments, such as Figure 11 institutes Show, the protocol communication module 130, including IIC interface modules, IIC interface modules include：IIC connectors J6, FET Q3 and Q4, pull-up resistor R12-R15；IIC connectors J6 power end IIC_VCC is connected to protocol communication power vd D_IIC；IIC connections Device J6 earth terminal GND ground connection；Data signal line SDA and clock cable between IIC connectors J6 and control chip 120 A FET is respectively connected with SCL, by taking clock cable SCL as an example, FET Q3 source electrode is connected to IIC connectors J6 Corresponding end SCL, and protocol communication power supply is connected to by a pull-up resistor R13, FET Q3 drain electrode is connected to control chip 120 corresponding end, and system working power is connected to by a pull-up resistor R12, FET Q3 grid is connected to system work Power supply, the IIC interface modules can operate at more holotypes or slave pattern, support standard and quick mode.

Because internal system STM32 IIC communication levels are 3.3V, and the IIC of camera module to be detected communication electricity Flat may be 1.8V, 2.8V or 3.3V, therefore, the conversion of line level be entered used here as FET Q3, Q4 so that this practicality is new Type camera module detects circuit, the camera module energy proper communication from different IIC communication level, only need to replace welding and carry For protocol communication power vd D_IIC power conversion chip U3, there is provided match the IIC power supplys of camera module, so that it may which compatibility is not With the camera module of IIC operation levels.

Based on said structure, the camera module detection circuit of the present embodiment has IIC and two kinds of communication interface moulds of SPI Block, two kinds of interface modules can be used concurrently or separately, the convenient chip communication with carrying IIC or SPI, improve the simultaneous of the present invention Capacitive.

It is described above, only specific embodiment of the present utility model, under above-mentioned teaching of the present utility model, this area Technical staff can carry out other improvement or deformation on the basis of above-described embodiment.It will be understood by those skilled in the art that Above-mentioned specific descriptions simply preferably explain the purpose of this utility model, and the scope of protection of the utility model should be with claim Protection domain be defined.

Claims (10)

1. a kind of camera module detects circuit, it is characterised in that the detection circuit includes：Usb interface module, protocol communication mould Block, sampling module, control chip and power transfer module；

The power transfer module connects with the usb interface module, protocol communication module, sampling module and control chip respectively Connect, the input power of the usb interface module is converted into system working power, there is provided to the protocol communication module, sampling Module and control chip, and the Power convert that the usb interface module is inputted are protocol communication power supply, there is provided to the association Discuss communication module；

The usb interface module, protocol communication module and sampling module are connected with the control chip respectively；The control chip Communicated by the usb interface module with host computer, receive the detection control instruction of host computer and return to detection knot to host computer Fruit, communicated by the protocol communication module with camera module, whether normal, lead to if detecting the EEROM of the camera module The driving current of the sampling module acquisition camera module is crossed, whether the driving chip for detecting the camera module is normal.

2. detection circuit as claimed in claim 1, it is characterised in that the protocol communication module, including IIC interface modules, The IIC interface modules include：IIC connectors, FET and pull-up resistor；The power supply of the IIC connectors is connected to institute State protocol communication power supply；The earth terminal ground connection of the IIC connectors；Number between the IIC connectors and the control chip According to a FET is respectively connected with signal wire and clock cable, the source electrode of the FET is connected to the IIC connections The corresponding end of device, and the protocol communication power supply is connected to by a pull-up resistor, the drain electrode of the FET is connected to the control The corresponding end of coremaking piece, and the system working power is connected to by a pull-up resistor, the grid of the FET is connected to institute State system working power.

3. detection circuit as claimed in claim 1, it is characterised in that the protocol communication module, including SPI interface module, The SPI interface module includes SPI connectors, and the power end of the SPI connectors connects the system operating voltage, described MOSI ends, MISO ends, SCK ends and the CE ends of SPI connectors connect the corresponding end of the control chip respectively, realize SPI protocol Communication, the power backup end of the SPI connectors connect the protocol communication power supply.

4. detection circuit as claimed in claim 1, it is characterised in that the sampling module includes：Sampling connector and sampling Resistance；The earth terminal ground connection of the sampling connector；The sampled resistance eutral grounding of sampling end of the sampling connector, the sampling The connection of end and the sampling resistor is connected to the sampling input of the control chip.

5. detection circuit as claimed in claim 1, it is characterised in that multiple digital power ends of the control chip and one Analog power end is connected to the system working power, and multiple digital power ends and an analog power end it Between be in series with isolation resistance realize single-point connect；Each digital power end is grounded through a filter capacitor；The simulation Power end is grounded through two filter capacitors in parallel, and for a filter capacitor to filter out High-frequency Interference, another filter capacitor is filter Except low-frequency disturbance.

6. detection circuit as claimed in claim 1, it is characterised in that the detection circuit also includes the SWD for burning program Interface module, the power supply of the SWD interface modules are connected to the system working power, the earth terminal of the SWD interface modules Ground connection, the data terminal and clock end of the SWD interface modules are connected with the corresponding end of the control chip.

7. detection circuit as claimed in claim 1, it is characterised in that the detection circuit also includes being used to control the control core The starting module of piece Starting mode, the starting module include first start connector and second start connector, described first Starting connector and the second startup connector includes power end, earth terminal and output end, described in the power end connects System working power, the earth terminal ground connection, the output end pass through in jumper cap and the power end and the earth terminal The output end of one connection, the first startup connector and the second startup connector connects the control chip respectively One startup control terminal.

8. detection circuit as claimed in claim 1, it is characterised in that the detection circuit also includes being used to indicate testing result Indicating module, the indicating module include normal indicating member and fault indication unit, the normal indicating member and the event Barrier indicating member includes light emitting diode, protective resistance and triode；The positive pole of the light emitting diode is through a guarantor Shield resistance is connected to the system working power, and negative pole connects the colelctor electrode of the triode；The grounded emitter of the triode, The base stage of the normal indicating member and the triode of the fault indication unit is connected to the control through a protective resistance respectively The normal outcome output end and fail result output end of coremaking piece.

9. detection circuit as claimed in claim 1, it is characterised in that the usb interface module includes：USB connector, impedance Build-out resistor, ground capacity and grounding resistance, the power supply of the USB connector are connected to the input of the power transfer module End, the earth terminal ground connection of the USB connector, two differential signal ends of the USB connector are by an impedance matching electricity Resistance connects the corresponding end of the control chip；The ground capacity and the grounding resistance connect the shell of the USB connector Ground.

10. detection circuit as claimed in claim 1, it is characterised in that the power transfer module includes：Offer system works The system working power converting unit of power supply, and the protocol communication power conversion unit of protocol communication power supply is provided；The system System working power converting unit and the protocol communication power conversion unit include voltage conversion chip and filter capacitor, described The input power of usb interface module is connected to the photovoltaic conversion chip after the ground connection filtering of at least one filter capacitor Input and Enable Pin, the output end of the photovoltaic conversion chip are grounded by least one filter capacitor, the photovoltaic conversion The earth terminal ground connection of chip.