Multi-path PCBA function test device and test method

Abstract

The embodiment of the invention discloses a multi-path PCBA function test device and a test method, the multi-path PCBA function test device is in communication connection with an upper computer, the multi-path PCBA function test device comprises a test platform, the test platform is provided with a plurality of test positions, the test positions are provided with mounting grooves for placing PCBAs, a test board is arranged below each mounting groove in a paired manner, and the test board is provided with a plurality of through holes. A main control board is arranged in the test platform, and a plurality of functional interface modules are integrated on the test board; and each functional interface module acquires and processes functional signals on the paired PCBA, transmits the processed functional signals to the main control board to judge whether corresponding functions are normal or not, and uploads detection results to the upper computer for display. A plurality of PCBAs can be tested at the same time, whether the functions of the PCBAs are normal or not can be automatically judged, manual operation judgment is reduced, and the PCBA testing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of electronic technology, and in particular to a functional testing device and a testing method for a multi-channel PCBA. Background Art

[0002] In the existing IPC (Internet Protocol Camera) industry, since the functions of the peripheral interfaces of IPC do not change much, the entire industry tests the whole machine after assembly, ignoring the testing of PCBA (Printed Circuit Board Assembly). During the whole machine testing, if defective products are found, they need to be disassembled for repair, which will not only damage the appearance materials, but also increase labor costs. In addition, PCBA will be shipped to customers as modules. If it is not tested before leaving the factory, it will increase the risk of customers receiving defective products and increase the return cost.

[0003] Although other electronic products (such as mobile phones) can perform individual tests on their internal PCBAs, this is also a pre-assembly test. The interface type connected to the test equipment is different from the peripheral interface of the IPC, and only one PCBA can be tested at a time. The test efficiency is low and it is not compatible with the IPC's PCBA test. Summary of the invention

[0004] In view of the above technical problems, the embodiments of the present invention provide a functional testing device and a testing method for a multi-channel PCBA to solve the problem that the existing PCBA test is not compatible with the IPC PCBA test and the test efficiency is low.

[0005] The embodiment of the present invention provides a functional test device for a multi-channel PCBA, which is communicatively connected to a host computer, and includes a test platform, wherein the test platform is provided with a plurality of test positions, wherein the test positions are provided with mounting slots for placing PCBAs, and a test board is provided in pairs below each mounting slot, and a main control board is provided inside the test platform, and a plurality of functional interface modules are integrated on the test board;

[0006] Each functional interface module collects and processes the functional signals on the paired PCBA and transmits them to the main control board to determine whether the corresponding function is normal, and uploads the test results to the host computer for display.

[0007] Optionally, in the functional testing device of the multi-channel PCBA, the main control board includes a control module and a communication module. The control module determines whether the corresponding function is normal according to the level change of each functional signal, and uploads the detection result to the host computer for display through the communication module wirelessly or wiredly.

[0008] Optionally, in the functional testing device for the multi-channel PCBA, the test board is provided with a filter interface module, a main light board interface module, a card interface module, a horizontal motor interface module and a vertical motor interface module;

[0009] The filter interface module performs level conversion and ESD protection on the collected filter detection signal and then outputs it to the main control module;

[0010] The main light board interface module collects the main light signal and outputs it to the main control module after performing ESD protection;

[0011] After the card interface module detects that the SD card is inserted, it powers on the SD card and collects the card signal and outputs it to the main control module;

[0012] The horizontal motor interface module collects the horizontal motor data signal, performs level conversion and outputs the corresponding horizontal motor detection signal to the main control module;

[0013] The vertical motor interface module collects vertical motor data signals, performs level conversion and outputs corresponding vertical motor detection signals to the main control module.

[0014] Optionally, in the functional test device of the multi-channel PCBA, the control module includes a main control chip, and the main control chip is connected to the filter interface module, the main light board interface module, the card interface module, the horizontal motor interface module and the vertical motor interface module on each test board.

[0015] Optionally, in the functional testing device of the multi-channel PCBA, the filter interface module includes a filter interface, a first switch tube, a second switch tube, a first resistor, a second resistor, a third resistor and a fourth resistor;

[0016] The filter interface is externally connected to the filter detection pin on the PCBA, the gate of the first switch tube is connected to one end of the second resistor and the first pin of the filter interface, the drain of the first switch tube is connected to one end of the first resistor and the DVP_BT_D0_PA00 pin of the main control chip; the other end of the first resistor is connected to the first power supply end, the source of the first switch tube is connected to the other end of the second resistor and the ground, the gate of the second switch tube is connected to one end of the fourth resistor and the second pin of the filter interface, the drain of the second switch tube is connected to one end of the third resistor and the DVP_BT_D1_PA01 pin of the main control chip; the other end of the third resistor is connected to the first power supply end, the source of the second switch tube is connected to the other end of the fourth resistor and the ground, and the G1 pin and G2 pin of the filter interface are both grounded.

[0017] Optionally, in the functional testing device for the multi-channel PCBA, the main light board interface module includes a main light interface, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor;

[0018] The main light interface is connected to the main light detection pin on the external PCBA, the first pin of the main light interface is connected to the MSC1_D1_PB20 pin of the main control chip through the tenth resistor, the third pin of the main light interface is connected to the MSC1_D0_PB19 pin of the main control chip through the ninth resistor, the fourth pin of the main light interface is connected to the MSC1_CMD_PB18 pin of the main control chip through the eighth resistor, the fifth pin of the main light interface is connected to the MSC1_CLK_PB17 pin of the main control chip through the seventh resistor, and the sixth pin of the main light interface is connected to the SADC_AUX0 pin of the main control chip; the second pin, the seventh pin, the G1 pin and the G2 pin of the main light interface are all grounded.

[0019] Optionally, in the functional testing device for the multi-channel PCBA, the card interface module includes a card holder, a third switch tube, an eleventh resistor, a twelfth resistor, a first capacitor, a second capacitor and a third capacitor;

[0020] An SD card is inserted into the card holder, the GND pin of the card holder is connected to the PAD pin and the ground, the DAT2 pin, DAT3 pin, CMD pin, CLK pin, DAT0 pin, DAT1 pin, and CD pin of the card holder are connected one-to-one with the MSC0_D2_PB02 pin, MSC0_D3_PB03 pin, MSC0_CMD_PB05 pin, MSC0_CLK_PB04 pin, MSC0_D0_PB00 pin, MSC0_D1_PB01 pin, and PWM3_PB31 pin of the main control chip; the drain of the third switch tube is the card power supply end; the gate of the third switch tube is connected to one end of the eleventh resistor, one end of the twelfth resistor, and one end of the second capacitor; the other end of the eleventh resistor is connected to one end of the first capacitor and the PWM3_PB31 pin of the main control chip; the source of the third switch tube is connected to the other end of the twelfth resistor, the other end of the second capacitor, and one end of the third capacitor; the other end of the first capacitor and the other end of the third capacitor are both grounded.

[0021] Optionally, in the functional testing device of the multi-channel PCBA, the horizontal motor interface module includes a first horizontal interface, a second horizontal interface, a first conversion circuit, a second conversion circuit, a third conversion circuit and a fourth conversion circuit;

[0022] The first horizontal interface and the second horizontal interface are externally connected to the first horizontal motor, the first pin of the first horizontal interface is connected to the first pin of the second horizontal interface and the input end of the fourth conversion circuit, the second pin of the first horizontal interface is connected to the second pin of the second horizontal interface and the input end of the third conversion circuit, the third pin of the first horizontal interface is connected to the third pin of the second horizontal interface and the input end of the second conversion circuit, the fourth pin of the first horizontal interface is connected to the fourth pin of the second horizontal interface and the input end of the first conversion circuit, and the fifth pin of the first horizontal interface is connected to the fifth pin of the second horizontal interface and the motor power supply end; the output ends of the first conversion circuit, the second conversion circuit, the third conversion circuit and the fourth conversion circuit are all connected to the main control chip.

[0023] Optionally, in the functional testing device for multi-channel PCBA, the first conversion circuit includes a fourth switch tube, a fifth switch tube, a thirteenth resistor, a fourteenth resistor and a fifteenth resistor;

[0024] The gate of the fourth switch tube is connected to one end of the thirteenth resistor, one end of the fourteenth resistor, the source of the fifth switch tube and the fourth pin of the first horizontal interface; the drain of the fourth switch tube is connected to one end of the fifteenth resistor, the source of the fifth switch tube and the MSC1_D2_PC12 pin of the main control chip; the source of the fourth switch tube is connected to the drain of the fifth switch tube, the other end of the fourteenth resistor and the ground; the other end of the thirteenth resistor is connected to the second power supply end, and the other end of the fifteenth resistor is connected to the third power supply end.

[0025] A second aspect of the embodiment of the invention provides a method for testing a functional testing device for a multi-channel PCBA, comprising the steps of:

[0026] After power-on, configure test information and initialize functional test equipment and DC power equipment;

[0027] Start the functional test, process and judge the collected functional signals, and output the test results to the host computer for display;

[0028] Determine whether to continue the test. If yes, return to the previous step; otherwise, exit the test.

[0029] In the technical solution provided by the embodiment of the present invention, the functional test device of multiple PCBAs is connected to the host computer for communication, including a test platform, on which are provided several test positions, on which are provided installation slots for placing PCBAs, and under each installation slot, a test board is provided in a pair, and inside the test platform, a main control board is provided, on which several functional interface modules are integrated; each functional interface module collects and processes the functional signal on the paired PCBA, and transmits it to the main control board to determine whether the corresponding function is normal, and uploads the test result to the host computer for display. Multiple PCBAs can be tested at the same time, and the function of the PCBA can be automatically determined to be normal, which reduces manual operation and judgment, and improves the test efficiency of the PCBA. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the structure of a functional testing device for multiple PCBAs in an embodiment of the present invention.

[0031] Figure 2 It is a circuit diagram of a part of the control module in an embodiment of the present invention.

[0032] Figure 3 FIG. 4 is another partial circuit diagram of the control module in an embodiment of the present invention.

[0033] Figure 4 FIG. 4 is a circuit diagram of a filter interface module in an embodiment of the present invention.

[0034] Figure 5 4 is a circuit diagram of the main light board interface module in an embodiment of the present invention.

[0035] Figure 6 FIG. 4 is a circuit diagram of a card interface module in an embodiment of the present invention.

[0036] Figure 7 4 is a circuit diagram of a horizontal motor interface module in an embodiment of the present invention.

[0037] Figure 8 FIG. 4 is a circuit diagram of a vertical motor interface module in an embodiment of the present invention.

[0038] Fig. 9 4 is a circuit diagram of the network port module in an embodiment of the present invention.

[0039] Fig.10 The figure is a flow chart of the testing method in the embodiment of the present invention. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The embodiments of the present invention and all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0041] It is easy to understand that, herein, relational terms such as first and second, etc. are only used to distinguish one entity, operation or direction from another entity, operation or direction, without requiring or implying any actual relationship or order between these entities, operations or directions. The directional terms such as upper, lower, left, right, front, rear, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore be changed accordingly according to their different positions and different use states. Therefore, these or other directional terms should not be interpreted as restrictive terms. In the following description, various parameters and components are described for embodiments of different structures, and these specific parameters and components are only used as examples and do not limit the embodiments of the present application.

[0042] Please also see Figures 1 to 9 The functional test device of multiple PCBA provided in the embodiment of the present invention is connected to the host computer by communication. The functional test device includes a test platform, and the test platform is provided with a plurality of test positions, and the test positions are provided with a mounting slot for placing PCBA, and a test board is provided under each mounting slot. For example, 6 mounting slots are provided and 6 test boards (a first test board 1_1, a second test board 1_2, a third test board 1_3, a fourth test board 1_4, a fifth test board 1_5 and a sixth test board 1_6) are paired. A main control board 2 is provided in the middle position of the test platform, and a plurality of functional interface modules are integrated on the test board 1. Each functional interface module is electrically connected with the main control board 2 and the functional signal on the PCBA to be tested. Each functional interface module collects and processes the functional signal on the paired PCBA (ESD protection and / or level conversion) and transmits it to the control module 21 on the main control board 2. The control module 21 determines whether the corresponding function is normal according to each functional signal, and uploads the detection result to the host computer for display through the communication module 22 on the main control board 2.

[0043] Wherein, the functional test device is connected to the host computer by communication, and can be connected by wired or wireless mode. If it is a wired connection, preferably a USB data cable is used, and the communication module 22 on the main control board 2 is a serial port to USB module. If it is a wireless connection, the communication module 22 is a WIFI module (a wireless communication module based on wireless LAN technology), a Bluetooth module, a Zigbee module (a low-power wireless communication module) or a LoRa module (a wireless communication module for long-distance communication), etc.

[0044] It is necessary to test the functions of the optical filter (IRCUT), main light board, SD card, horizontal motor, vertical motor, speaker, microphone, etc. of the PCBA test. Taking the first test board 1_1 as an example, a filter interface module 11, a main light board interface module 12, a card interface module 13, a horizontal motor interface module 14 and a vertical motor interface module 15 are provided thereon; the filter interface module 11 is connected to the control module 21 on the main control board and the filter detection pin on the PCBA, the main light board interface module 12 is connected to the control module 21 and the main light detection pin on the PCBA, the card interface module 13 is inserted with an SD card and connected to the control module 21, the horizontal motor interface module 14 is connected to the control module 21 and externally connected to the horizontal motor, and the vertical motor interface module 15 is connected to the control module 21 and externally connected to the vertical motor.

[0045] The filter interface module 11 performs level conversion and ESD protection on the collected filter detection signals (IRCUT1-P signal and IRCUT1-N signal) and then outputs them to the main control module; the main light board interface module 12 collects the main light signals (LDR1 signal, LED_R1 signal, LED_G1 signal, IRL1_EN signal and WL1_EN signal) and outputs them to the main control module after performing ESD protection; after the card interface module 13 detects that the SD card is inserted, it powers on the SD card and collects the card signals (MSC0_D0~D3 signals, SD0_CD_N signal, MSC0_CMD and MSC0_CLK-C signal) and outputs them to the main control module; the horizontal motor interface module 14 collects the horizontal motor data signal (HM1_D1~D4), performs level conversion and then outputs the corresponding horizontal motor detection signal (HM1_STEP0~STEP3) to the main control module. The vertical motor interface module 14 collects vertical motor data signals (VM5_D1-D4), performs level conversion, and outputs corresponding vertical motor detection signals (VM1_STEP0-STEP3) to the main control module.

[0046] In this embodiment, there are 6 filter interface modules, 6 main light board interface modules, 6 card interface modules, 6 horizontal motor interface modules and 6 vertical motor interface modules; they share the control module 21 on the main board. Since the internal circuit structure of each interface module is the same, the transmitted signal is the same, and the difference is only the corresponding PCBA. Therefore, the circuit uses the corresponding digital label to distinguish which PCBA signal is. Figure 1 and Figure 2 shown.

[0047] The functional testing device can test multiple PCBAs at the same time, automatically determine whether the PCBA functions normally, reduce manual operation and judgment, improve the testing efficiency of the PCBA, and ensure that the PCBA yield on the production line is 100%; reduce the probability of whole machine defects, thereby improving production efficiency and reducing production costs; and ensure that the modules provided to customers are good products, reduce the return rate, and reduce the losses caused by rework, thereby reducing transportation and maintenance costs.

[0048] It should be understood that the functional test device is mainly suitable for PCBA testing in the IPC industry, and is also compatible with various PCBAs in other industries. It only needs to replace the corresponding functional connector so that it can be connected to the pins of the corresponding functional modules on the PCBA. The test board also includes an existing power supply module (providing a first power supply terminal to output CPU_3V3 voltage, a second power supply terminal to output VCC_5 voltage, a third power supply terminal to output VCC_1V8 voltage, etc.)

[0049] Please continue reading Figure 2 The control module 21 includes a main control chip U1 preferably of model T40N, which is connected to the filter interface module, main light board interface module, card interface module, horizontal motor interface module and vertical motor interface module on each test board. Each interface module on each test board 1 and various detection signals collected are transmitted to the main control chip U1 for processing, analysis and judgment, such as whether the high and low levels of the signal change (generating a rising edge or a falling edge), whether the voltage of the signal is within the set range, etc., so as to judge whether the corresponding function is normal, and upload the detection results to the host computer through the communication module 22 for display.

[0050] like Figure 4As shown, the filter interface module 11 includes a filter interface J1, a first switch tube Q1, a second switch tube Q2, a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4; the filter interface J1 is externally connected to the filter detection pin on the PCBA, the gate of the first switch tube Q1 is connected to one end of the second resistor R2 and the first pin of the filter interface J1 (for transmitting the IRCUT1_P signal), the drain of the first switch tube Q1 is connected to one end of the first resistor R1 and the DVP_BT_D0_PA00 pin of the main control chip U1; the other end of the first resistor R1 is connected to the first The power supply end (providing CPU_3V3 voltage), the source of the first switch tube Q1 is connected to the other end of the second resistor R2 and ground, the gate of the second switch tube Q2 is connected to one end of the fourth resistor R4 and the second pin of the filter interface J1 (used to transmit the IRCUT1_N signal), the drain of the second switch tube Q2 is connected to one end of the third resistor R3 and the DVP_BT_D1_PA01 pin of the main control chip U1; the other end of the third resistor R3 is connected to the first power supply end, the source of the second switch tube Q2 is connected to the other end of the fourth resistor R4 and ground, and the G1 pin and G2 pin of the filter interface J1 are both grounded.

[0051] Among them, the filter interface J1 is externally connected to the filter detection pin on the PCBA (transmitting the filter detection signal, i.e., the IRCUT1-P signal and the IRCUT1-N signal), and the first switch tube Q1 and the second switch tube Q2 are preferably NMOS tubes of model IA1134K. When the IRCUT1-P signal and the IRCUT1-N signal are at a high level, the corresponding switch tube is turned on, and the drains of Q1 and Q2 output the low-level IRCUT1_P signal and the IRCUT1_N signal to the main control chip U1; when the IRCUT1-P signal and the IRCUT1-N signal are at a low level, the corresponding switch tube is turned off, and the IRCUT1_P signal and the IRCUT1_N signal are pulled up to the CPU_3V3 voltage of 3.3V through the corresponding R1 and R3 (the resistance value is preferably 100KΩ). In this way, when the test detects the IRCUT item, the IRCUT1-P signal and IRCUT1-N signal collected and transmitted by the filter interface J1 are transmitted to the main control chip after level conversion through Q1 and Q2. The main control chip detects the IRCUT1_P signal and IRCUT1_N signal. If a falling edge from a high level to a low level is generated, it indicates that the IRCUT function of the PCBA under test is normal.

[0052] When there is no IRCUT1-P signal and IRCUT1-N signal input, the gates of Q1 and Q2 are pulled down to a low level by the corresponding second resistor R2 and fourth resistor R4 (the resistance is preferably 1MΩ), maintaining the cut-off state, and continuously outputting high-level IRCUT1_P signal and IRCUT1_N signal, and the main control chip will not be triggered.

[0053] Preferably, the filter interface module also includes a fifth resistor R5, a sixth resistor R6, a first diode D1 and a second diode D2; one end of the fifth resistor R5 is connected to the gate of the first switch tube Q1, the other end of the fifth resistor R5 is connected to the first pin of the filter interface J1 and one end of the first diode D1, one end of the sixth resistor R6 is connected to the gate of the second switch tube Q2, the other end of the sixth resistor R6 is connected to the second pin of the filter interface J1 and one end of the second diode D2, and the other end of the first diode D1 and the other end of the second diode D2 are both grounded.

[0054] The fifth resistor R5 and the sixth resistor R6 are used for current limiting to protect the connected switch tube, and the resistance is preferably 10KΩ. The first diode D1 and the second diode D2 are preferably bidirectional ESD diodes of model JEB05DFA, which are used for voltage peak limiting and ESD protection.

[0055] The filter interface module on the second test board 1_2 inputs the filter detection signals IRCUT2-P and IRCUT2-N, and outputs IRCUT2_P and IRCUT2_N signals after level conversion. Correspondingly, the filter interface module on the third test board 1_3 inputs IRCUT3-P and IRCUT3-N signals, and outputs IRCUT3_P and IRCUT3_N signals. The filter interface module on the fourth test board 1_4 inputs IRCUT4-P and IRCUT4-N signals, and outputs IRCUT4_P and IRCUT4_N signals. The filter interface module on the fifth test board 1_5 inputs IRCUT5-P and IRCUT5-N signals, and outputs IRCUT5_P and IRCUT5_N signals. The filter interface module on the sixth test board 1_6 inputs the IRCUT6-P signal and the IRCUT6-N signal, and outputs the IRCUT6_P signal and the IRCUT6_N signal.

[0056] like Figure 5As shown, the main light board interface module 12 includes a main light interface J2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a tenth resistor R10; the main light interface J2 is externally connected to the main light detection pin on the PCBA, the first pin of the main light interface J2 is connected to the MSC1_D1_PB20 pin of the main control chip U1 through the tenth resistor R10, the third pin of the main light interface J2 is connected to the MSC1_D0_PB19 pin of the main control chip U1 through the ninth resistor R9, the fourth pin of the main light interface J2 is connected to the MSC1_CMD_PB18 pin of the main control chip U1 through the eighth resistor R8, the fifth pin of the main light interface J2 is connected to the MSC1_CLK_PB17 pin of the main control chip U1 through the seventh resistor R7, and the sixth pin of the main light interface J2 is connected to the SADC_AUX0 pin of the main control chip U1; the second pin, the seventh pin, the G1 pin and the G2 pin of the main light interface J2 are all grounded.

[0057] Among them, the main light signal transmitted by the main light detection pin on the PCBA (including hard light signal LDR1, red light signal LED_R1, green light signal LED_G1, infrared light enable control signal IRL1_EN, white light enable signal WL1_EN) is transmitted to the main control chip U1 through the main light interface J2. The pin levels of these signals are the same as the pin levels of the main control chip U1, and level conversion is not required here. When the LED item is tested, if the main control chip U1 detects changes in these signals, it means that the main light function on the tested PCBA is normal.

[0058] Preferably, for ESD protection, such as Figure 5 As shown, the 1st, 3rd, 4th and 5th pins of the main light interface J2 can also be grounded through a bidirectional ESD diode (model JEB05DFA) respectively.

[0059] The main light board interface module on the second test board 1_2 transmits main light signals including LDR2 signal, LED_R2 signal, LED_G2 signal, IRL2_EN signal and WL2_EN signal. Correspondingly, the main light board interface module on the third test board 1_3 transmits main light signals including LDR3 signal, LED_R3 signal, LED_G3 signal, IRL3_EN signal and WL3_EN signal. The main light board interface module on the fourth test board 1_4 transmits main light signals including LDR4 signal, LED_R4 signal, LED_G4 signal, IRL4_EN signal and WL4_EN signal. The main light board interface module on the fifth test board 1_5 transmits main light signals including LDR5 signal, LED_R5 signal, LED_G5 signal, IRL5_EN signal and WL5_EN signal. The main light board interface module on the sixth test board 1_6 transmits main light signals including LDR6 signal, LED_R6 signal, LED_G6 signal, IRL6_EN signal and WL6_EN signal.

[0060] like Figure 6 As shown, the card interface module 13 includes a card holder J3, a third switch tube Q3, an eleventh resistor R11, a twelfth resistor R12, a first capacitor C1, a second capacitor C2 and a third capacitor C3; an SD card is inserted into the card holder J3, the GND pin (including the GND1 pin and the GND2 pin) of the card holder J3 is connected to the PAD pin (including the PAD1 pin and the PAD2 pin) and the ground, the DAT2 pin, the DAT3 pin, the CMD pin, the CLK pin, the DAT0 pin, the DAT1 pin, the CD pin of the card holder J3 are connected to the MSC0_D2_PB02 pin, the MSC0_D3_PB03 pin, the MSC0_CMD_PB05 pin, the MSC0_CLK_PB04 pin of the main control chip U1. The pin, MSC0_D0_PB00 pin, MSC0_D1_PB01 pin, and PWM3_PB31 pin are connected one-to-one; the drain of the third switch tube Q3 is the card power supply end (providing VDDMSC0 voltage); the gate of the third switch tube Q3 is connected to one end of the eleventh resistor R11, one end of the twelfth resistor R12, and one end of the second capacitor C2; the other end of the eleventh resistor R11 is connected to one end of the first capacitor C1 and the PWM3_PB31 pin of the main control chip; the source of the third switch tube Q3 is connected to the other end of the twelfth resistor R12, the other end of the second capacitor C2, and one end of the third capacitor C3; the other end of the first capacitor C1 and the other end of the third capacitor C3 are both grounded.

[0061] The third switch tube Q3 is preferably a PMOS tube of model WPM3401. When the SD card is directly inserted into the card holder J3, the SD0_CD_N signal for detecting whether the SD card is inserted becomes low level, the third switch tube Q3 is turned on, the CPU_3V3 voltage provided by the functional test device is output through Q3, and converted into the card power supply voltage VDDMSC0 to power the SD card in the card holder; when the SD card is not inserted, no SD0_CD_N signal is generated, the gate of Q3 is pulled up to a high level by the CPU_3V3 voltage through R12, Q3 is cut off, no card power supply voltage VDDMSC0 is output, and the SD card is powered off. Therefore, the SD0_CD_N signal can also control whether the SD card is powered on.

[0062] After the SD card is powered on, various card signals on it (such as MSC0_D0~D3 signals representing data communication, SD0_CD_N signal, MSC0_CMD signal representing control instructions, and MSC0_CLK-C signal representing the clock) are transmitted to the main control chip through the card socket J3. The main control chip detects the high and low levels or pulse waveforms of each signal. If the SD card can communicate successfully with the main control chip, it can also communicate successfully with the main control chip on the PCBA to be tested, indicating that the SD card-related signals are normal, thereby realizing the test function of the SD card, and avoiding repeated insertion and removal of the SD card on the PCBA to be tested, reducing employee operations, and being able to test multiple SD cards at the same time, thereby improving test efficiency.

[0063] The various card signals output by the SD card are relatively important. Preferably, these signals can also be led out to test points to observe their waveforms, and then corresponding resistors, capacitors, diodes and other devices are set, such as Figure 6 As shown, in the card interface module 1-6, the CLK pin of the card holder J3 can also be connected to the 47th test point TP47 through a resistor, and the CLK pin of the card holder J3 is also grounded through a capacitor. The resistor and the capacitor form an RC filter to filter the MSC0_CLK-C signal. The DAT2 pin, DAT3 pin, CMD pin, CLK pin, DAT0 pin, DAT1 pin, and CD pin of the card holder J3 can also be grounded through a bidirectional ESD diode (model JEB05DFA) for ESD protection. The CD pin, DAT3 pin, DAT2 pin, DAT1 pin, DAT0 pin, and CMD pin of the card holder J3 are respectively connected to the 41st test point TP41 to the 46th test point TP46. The card power supply voltage VDDMSC0 is connected to the 93rd test point TP93. The card power supply voltage VDDMSC0 and TP93 can be grounded through a bidirectional ESD diode, and two capacitors and a resistor are respectively connected in parallel with the bidirectional ESD diode.

[0064] The card interface module on the second test board 1_2 transmits card signals including MSC1_D0~D3 signals, SD1_CD_N signals, MSC1_CMD signals and MSC1_CLK-C signals. Correspondingly, the card interface module on the third test board 1_3 transmits card signals including MSC2_D0~D3 signals, SD2_CD_N signals, MSC2_CMD signals and MSC2_CLK-C signals. The card interface module on the fourth test board 1_4 transmits card signals including MSC3_D0~D3 signals, SD3_CD_N signals, MSC3_CMD signals and MSC3_CLK-C signals. The card interface module on the fifth test board 1_5 transmits card signals including MSC4_D0~D3 signals, SD4_CD_N signals, MSC4_CMD signals and MSC4_CLK-C signals. The card interface module on the sixth test board 1_6 transmits card signals including MSC5_D0-D3 signals, SD5_CD_N signals, MSC5_CMD signals and MSC5_CLK-C signals.

[0065] like Figure 7 As shown, the horizontal motor interface module 14 includes a first horizontal interface J4, a second horizontal interface J5, a first conversion circuit 141, a second conversion circuit 142, a third conversion circuit 143 and a fourth conversion circuit 144; the first horizontal interface J4 and the second horizontal interface J5 are externally connected to a first horizontal motor, the first pin of the first horizontal interface J4 is connected to the first pin of the second horizontal interface J5 and the input end of the fourth conversion circuit 144, the second pin of the first horizontal interface J4 is connected to the second pin of the second horizontal interface J5 and the input end of the third conversion circuit 143, the first horizontal interface J4 is connected to the second pin of the second horizontal interface J5 and the input end of the third conversion circuit 143, The third pin of the horizontal interface J4 is connected to the third pin of the second horizontal interface J5 and the input end of the second conversion circuit 142, the fourth pin of the first horizontal interface J4 is connected to the fourth pin of the second horizontal interface J5 and the input end of the first conversion circuit 141, and the fifth pin of the first horizontal interface J4 is connected to the fifth pin of the second horizontal interface J5 and the motor power supply end (the motor power supply MB1_H_5V is provided by PCBA); the output ends of the first conversion circuit 141, the second conversion circuit 142, the third conversion circuit 143 and the fourth conversion circuit 144 are all connected to the main control chip U1.

[0066] Among them, the first conversion circuit 141 includes a fourth switch tube Q4, a fifth switch tube Q5, a thirteenth resistor R13, a fourteenth resistor R14 and a fifteenth resistor R15; the gate of the fourth switch tube Q4 (i.e., the input end of the first conversion circuit 141) is connected to one end of the thirteenth resistor R13, one end of the fourteenth resistor R14, the source of the fifth switch tube Q5 and the fourth pin of the first horizontal interface J4; the drain of the fourth switch tube Q4 is connected to one end of the fifteenth resistor R15, the source of the fifth switch tube Q5 (i.e., the output end of the first conversion circuit 141) and the MSC1_D2_PC12 pin of the main control chip U1; the source of the fourth switch tube Q4 is connected to the drain of the fifth switch tube Q5, the other end of the fourteenth resistor R14 and the ground; the other end of the thirteenth resistor R13 is connected to the second power supply end (providing VCC_5 voltage), and the other end of the fifteenth resistor R15 is connected to the third power supply end (providing VCC_1V8 voltage).

[0067] The second conversion circuit 142 includes a sixth switch tube Q6, a seventh switch tube Q7, a sixteenth resistor R16, a seventeenth resistor R17 and an eighteenth resistor R18; the gate of the sixth switch tube Q6 (i.e., the input end of the second conversion circuit 142) is connected to one end of the sixteenth resistor R16, one end of the seventeenth resistor R17, the source of the seventh switch tube Q7 and the third pin of the first horizontal interface J4; the drain of the sixth switch tube Q6 is connected to one end of the eighteenth resistor R18, the source of the seventh switch tube Q7 (i.e., the output end of the second conversion circuit 142) and the MSC1_D3_PC13 pin of the main control chip U1; the source of the sixth switch tube Q6 is connected to the drain of the seventh switch tube Q7, the other end of the seventeenth resistor R17 and the ground; the other end of the sixteenth resistor R16 is connected to the second power supply end, and the other end of the eighteenth resistor R18 is connected to the third power supply end.

[0068] The third conversion circuit 143 includes an eighth switch tube Q8, a ninth switch tube Q9, a nineteenth resistor R19, a twentieth resistor R20 and a twenty-first resistor R21; the gate of the eighth switch tube Q8 (i.e., the input end of the third conversion circuit 143) is connected to one end of the nineteenth resistor R19, one end of the twentieth resistor R20, the source of the ninth switch tube Q9 and the second pin of the first horizontal interface J4; the drain of the eighth switch tube Q8 is connected to one end of the twenty-first resistor R21, the source of the ninth switch tube Q9 (i.e., the third conversion circuit 143) and the SMB2_SDA_PC14 pin of the main control chip U1; the source of the eighth switch tube Q8 is connected to the drain of the ninth switch tube Q9, the other end of the twentieth resistor R20 and the ground; the other end of the nineteenth resistor R19 is connected to the second power supply end (providing the VCC_5 voltage), and the other end of the twenty-first resistor R21 is connected to the third power supply end (providing the VCC_1V8 voltage).

[0069] The fourth conversion circuit 144 includes a tenth switch tube Q10, an eleventh switch tube Q11, a twenty-second resistor R22, a twenty-third resistor R23 and a twenty-fourth resistor R24; the gate of the tenth switch tube Q10 (i.e., the input end of the fourth conversion circuit 144) is connected to one end of the twenty-second resistor R22, one end of the twenty-third resistor R23, the source of the eleventh switch tube Q11 and the first pin of the first horizontal interface J4; the drain of the tenth switch tube Q10 is connected to one end of the twenty-fourth resistor R24, the source of the eleventh switch tube Q11 (i.e., the output end of the fourth conversion circuit 144) and the SMB2_SCK_PC15 pin of the main control chip U1; the source of the tenth switch tube Q10 is connected to the drain of the eleventh switch tube Q11, the other end of the twenty-third resistor R23 and the ground; the other end of the twenty-second resistor R22 is connected to the second power supply end (providing the VCC_5 voltage), and the other end of the twenty-fourth resistor R24 ​​is connected to the third power supply end (providing the VCC_1V8 voltage).

[0070] Among them, Q4, Q6, Q8 and Q10 are preferably NMOS tubes of model IA1134K, which are turned on when the gate is at a high level and cut off when the gate is at a low level. Q5, Q7, Q9 and Q11 are preferably PMOS tubes of model YC2301ED1SF, which are turned on when the gate is at a low level and cut off when the gate is at a high level. Pins 1 to 4 of the first horizontal interface J4 and the second horizontal interface J5 transmit the first horizontal motor data signal (HM1_D1~D4) of the first horizontal motor to the conversion circuit composed of the corresponding switch tube for level conversion, and output the corresponding first horizontal motor detection signal (HM1_STEP0~STEP3). For distinction, the line of the HM1_D1 signal is blue, the line of the HM1_D2 signal is brown, the line of the HM1_D3 signal is yellow, and the line of the HM1_D4 signal is black.

[0071] Taking the first conversion circuit 141 as an example, when the HM1_D1 signal is at a high level, Q4 is turned on while Q5 is turned off, and the HM1_STEP3 signal output by the source of Q5 is pulled down to a low level by Q4. When the HM1_D1 signal is at a low level, Q4 is turned off while Q5 is turned on, and the HM1_STEP3 signal output by the source of Q5 is pulled down to a low level by Q4. When there is no HM1_D1 signal input, the gate voltage of Q4 is the voltage divided by R13 and R14. At this time, Q4 and Q5 are both turned off, and the HM1_STEP3 signal output by the source of Q5 is pulled up to a high level of 1.8V by R15. Therefore, when the main control chip detects that the HM1_STEP3 signal changes from a high level to a low level, it indicates that this part of the horizontal motor functions normally. The MB1_H_5V signal is the power supply for the horizontal motor.

[0072] Preferably, the first to fourth pins of the second horizontal interface J5 can be grounded via a bidirectional ESD diode respectively to perform ESD protection.

[0073] The circuit structure of the vertical motor interface module 15 is the same as that of the horizontal motor interface module 14. Figure 8 As shown; the working principles of the two are the same, the difference is the signal name and the pin of the connected main control chip is different, such as the first vertical motor data signal (VM1_D1~D4) of the first vertical motor is converted to the corresponding conversion circuit for level conversion, and the corresponding first vertical motor detection signal VM1_STEP0~STEP3 is output. For details, please refer to Figure 8 and Figure 2 , which will not be elaborated here.

[0074] The horizontal motor interface module on the second test board 1_2 transmits the second horizontal motor data signal (HM2_D1~D4) of the second horizontal motor, and outputs the corresponding second horizontal motor detection signal HM2_STEP0~STEP3 after level conversion. The vertical motor interface module on the second test board 1_2 transmits the second motor data signal (VM2_D1~D4) of the second vertical motor, and outputs the corresponding second vertical motor detection signal VM2_STEP0~STEP3 after level conversion.

[0075] Correspondingly, the horizontal motor interface module on the third test board 1_3 transmits the third horizontal motor data signal (HM3_D1~D4) of the third horizontal motor, and outputs the corresponding third horizontal motor detection signal HM3_STEP0~STEP3 after level conversion. The vertical motor interface module on the third test board 1_2 transmits the third motor data signal (VM3_D1~D4) of the third vertical motor, and outputs the corresponding third vertical motor detection signal VM3_STEP0~STEP3 after level conversion.

[0076] The horizontal motor interface module on the fourth test board 1_4 transmits the fourth horizontal motor data signal (HM4_D1~D4) of the fourth horizontal motor, and outputs the corresponding fourth horizontal motor detection signal HM4_STEP0~STEP3 after level conversion. The vertical motor interface module on the fourth test board 1_2 transmits the fourth motor data signal (VM4_D1~D4) of the fourth vertical motor, and outputs the corresponding fourth vertical motor detection signal VM4_STEP0~STEP3 after level conversion.

[0077] The horizontal motor interface module on the fifth test board 1_5 transmits the fifth horizontal motor data signal (HM5_D1~D4) of the fifth horizontal motor, and outputs the corresponding fifth horizontal motor detection signal HM5_STEP0~STEP3 after level conversion. The vertical motor interface module on the fifth test board 1_2 transmits the fifth motor data signal (VM5_D1~D4) of the fifth vertical motor, and outputs the corresponding fifth vertical motor detection signal VM5_STEP0~STEP3 after level conversion.

[0078] The horizontal motor interface module on the sixth test board 1_6 transmits the sixth horizontal motor data signal (HM6_D1~D4) of the sixth horizontal motor, and outputs the corresponding sixth horizontal motor detection signal HM6_STEP0~STEP3 after level conversion. The vertical motor interface module on the sixth test board 1_2 transmits the sixth motor data signal (VM6_D1~D4) of the sixth vertical motor, and outputs the corresponding sixth vertical motor detection signal VM6_STEP0~STEP3 after level conversion.

[0079] Based on the fact that the functional testing device is mainly suitable for PCBA testing in the IPC industry, in order to export the image for testing, preferably, a network port function can be added, and a network port module can be respectively set on each test board, and its circuit is as follows Fig. 9 As shown, the network interface J8 connects the main control chip and the network port J9, and the network port J9 is plugged into an external network cable to upload various signals to the host computer.

[0080] Based on the above-mentioned multi-channel PCBA functional testing device, this embodiment also provides a testing method for the multi-channel PCBA functional testing device, please refer to Fig.10 , the testing method comprises the steps of:

[0081] S100, configure test information after power-on, and initialize the functional test device and DC power equipment;

[0082] S200, start the function test, process and judge the collected functional signals, and output the test results to the host computer for display;

[0083] S300, determine whether to continue the test, if yes, return to step S200, otherwise exit the test.

[0084] In step S100, power-on is to supply power to the functional test device. A power indicator light is provided on the test platform. After power-on, if the control module on the main control board detects that the power supply voltage is normal, the power indicator light is turned on. The configuration test information is executed by the host computer, and relevant information is obtained from the functional test device, such as the model of the functional test device, the network name of the local area network when the two are connected for communication, and relevant test items are added in the host computer.

[0085] The DC power device is used to power the PCBA to be tested. The PCBA can output the corresponding functional signal only after it is powered. The preferred device model is JSY-MK-218. The DC power device can be directly connected to the host computer through the serial port, and the host computer can collect the power supply voltage and current provided by the DC power device.

[0086] Initializing the functional test device and the DC power equipment means that the host computer communicates with the functional test device and the DC power equipment, the host computer detects whether the DC power equipment is connected and logged in, whether the PCBA is placed on the test board (the PCBA is detected through the connected UART information, which is automatically completed by the host computer), and initializes the configuration of each GPIO port (pin for inputting each functional signal) in the control module on the main control board.

[0087] In step S200, there is a test button option on the host computer, and the test function can be turned on by clicking the test button option. In addition to collecting various functional signals to the main control chip U1 in the control module through the test board, the power supply voltage and current of the DC power equipment to the PCBA can also be directly collected and uploaded to the host computer through the serial port for display.

[0088] The main control chip U1 actively scans the level status of each functional signal input on its corresponding pin according to the set test sequence. When the test detects the IRCUT item, the IRCUT1-P signal and IRCUT1-N signal collected and transmitted by the filter interface J1 are transmitted to the main control chip after level conversion through Q1 and Q2. The main control chip detects the IRCUT1_P signal and IRCUT1_N signal. If a falling edge from high level to low level is generated, it means that the IRCUT function of the PCBA under test is normal.

[0089] When the LED item is tested, the main light signal (including hard light signal LDR1, red light signal LED_R1, green light signal LED_G1, IRL1_EN, white light enable signal WL1_EN) transmitted by the main light detection pin on the PCBA is transmitted to the main control chip U1 through the main light interface J2. If the main control chip U1 detects that these signals change from high level to low level, it means that the main light on the tested PCBA is functioning normally.

[0090] When the test detects the SD card item, various card signals on the SD card (MSC0_D0~D3 signal, SD0_CD_N signal, MSC0_CMD signal, MSC0_CLK-C signal) are transmitted to the main control chip through the card socket J3. If the main control chip detects that each signal changes from high level to low level or has a pulse waveform, it means that the SD card can successfully communicate with the main control chip and the SD card related signals are normal.

[0091] When the horizontal motor is tested, the motor data signals transmitted by the first horizontal interface J4 and the second horizontal interface J5 are converted to the level and then transmitted to the main control chip. The main control chip U1 detects that if these signals change from high level to low level, it means that the function of the horizontal motor under test is normal. The test method of the vertical motor is the same as that of the horizontal motor.

[0092] In step S300, there is an end button option on the host computer, and the test can be exited by clicking the end button option.

[0093] In summary, the functional testing device and method of multi-channel PCBA provided by the present invention can test multiple PCBAs at the same time, automatically determine whether the various functions of PCBA are normal, reduce manual operation and judgment, improve the testing efficiency of PCBA, and reduce production costs; it can also ensure that the modules provided to customers are good products, reduce the return rate, and reduce the bad losses caused by rework, thereby reducing transportation and maintenance costs. In addition, multiple test boards share a main control board, and a main control chip can process multiple groups of signals at the same time, saving the circuit cost of the main control.

[0094] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A functional test device for multi-channel PCBA, connected to a host computer for communication, characterized in that: A test platform is provided, wherein a plurality of test positions are provided on the test positions, and a mounting slot for placing PCBA is provided on the test position, and a test board is provided under each mounting slot in a pair, and a main control board is provided inside the test platform, and a plurality of functional interface modules are integrated on the test board; Each functional interface module collects and processes the functional signals on the paired PCBA and transmits them to the main control board to determine whether the corresponding function is normal, and uploads the test results to the host computer for display.

2. The functional testing device for multi-channel PCBA according to claim 1, characterized in that: The main control board includes a control module and a communication module. The control module determines whether the corresponding function is normal according to the level change of each functional signal, and uploads the detection result to the host computer for display through the communication module wirelessly or wired.

3. The functional testing device for multi-channel PCBA according to claim 2, characterized in that: The test board is provided with a filter interface module, a main light board interface module, a card interface module, a horizontal motor interface module and a vertical motor interface module; The filter interface module performs level conversion and ESD protection on the collected filter detection signal and then outputs it to the main control module; The main light board interface module collects the main light signal and outputs it to the main control module after performing ESD protection; After the card interface module detects that the SD card is inserted, it powers on the SD card and collects the card signal and outputs it to the main control module; The horizontal motor interface module collects the horizontal motor data signal, performs level conversion and outputs the corresponding horizontal motor detection signal to the main control module; The vertical motor interface module collects vertical motor data signals, performs level conversion and outputs corresponding vertical motor detection signals to the main control module.

4. The functional testing device for multi-channel PCBA according to claim 3, characterized in that: The control module includes a main control chip, and the main control chip is connected to the filter interface module, the main light board interface module, the card interface module, the horizontal motor interface module and the vertical motor interface module on each test board.

5. The functional testing device for multi-channel PCBA according to claim 4, characterized in that: The filter interface module includes a filter interface, a first switch tube, a second switch tube, a first resistor, a second resistor, a third resistor and a fourth resistor; The filter interface is externally connected to the filter detection pin on the PCBA, the gate of the first switch tube is connected to one end of the second resistor and the first pin of the filter interface, the drain of the first switch tube is connected to one end of the first resistor and the DVP_BT_D0_PA00 pin of the main control chip; the other end of the first resistor is connected to the first power supply end, the source of the first switch tube is connected to the other end of the second resistor and the ground, the gate of the second switch tube is connected to one end of the fourth resistor and the second pin of the filter interface, the drain of the second switch tube is connected to one end of the third resistor and the DVP_BT_D1_PA01 pin of the main control chip; the other end of the third resistor is connected to the first power supply end, the source of the second switch tube is connected to the other end of the fourth resistor and the ground, and the G1 pin and G2 pin of the filter interface are both grounded.

6. The functional testing device for multi-channel PCBA according to claim 4, characterized in that: The main light board interface module includes a main light interface, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor; The main light interface is connected to the main light detection pin on the external PCBA, the first pin of the main light interface is connected to the MSC1_D1_PB20 pin of the main control chip through the tenth resistor, the third pin of the main light interface is connected to the MSC1_D0_PB19 pin of the main control chip through the ninth resistor, the fourth pin of the main light interface is connected to the MSC1_CMD_PB18 pin of the main control chip through the eighth resistor, the fifth pin of the main light interface is connected to the MSC1_CLK_PB17 pin of the main control chip through the seventh resistor, and the sixth pin of the main light interface is connected to the SADC_AUX0 pin of the main control chip; the second pin, the seventh pin, the G1 pin and the G2 pin of the main light interface are all grounded.

7. The functional testing device for multi-channel PCBA according to claim 4, characterized in that: The card interface module includes a card holder, a third switch tube, an eleventh resistor, a twelfth resistor, a first capacitor, a second capacitor and a third capacitor; An SD card is inserted into the card holder, the GND pin of the card holder is connected to the PAD pin and the ground, the DAT2 pin, DAT3 pin, CMD pin, CLK pin, DAT0 pin, DAT1 pin, and CD pin of the card holder are connected one-to-one with the MSC0_D2_PB02 pin, MSC0_D3_PB03 pin, MSC0_CMD_PB05 pin, MSC0_CLK_PB04 pin, MSC0_D0_PB00 pin, MSC0_D1_PB01 pin, and PWM3_PB31 pin of the main control chip; the drain of the third switch tube is the card power supply end; the gate of the third switch tube is connected to one end of the eleventh resistor, one end of the twelfth resistor, and one end of the second capacitor; the other end of the eleventh resistor is connected to one end of the first capacitor and the PWM3_PB31 pin of the main control chip; the source of the third switch tube is connected to the other end of the twelfth resistor, the other end of the second capacitor, and one end of the third capacitor; the other end of the first capacitor and the other end of the third capacitor are both grounded.

8. The functional testing device for multi-channel PCBA according to claim 4, characterized in that: The horizontal motor interface module includes a first horizontal interface, a second horizontal interface, a first conversion circuit, a second conversion circuit, a third conversion circuit and a fourth conversion circuit; The first horizontal interface and the second horizontal interface are externally connected to the first horizontal motor, the first pin of the first horizontal interface is connected to the first pin of the second horizontal interface and the input end of the fourth conversion circuit, the second pin of the first horizontal interface is connected to the second pin of the second horizontal interface and the input end of the third conversion circuit, the third pin of the first horizontal interface is connected to the third pin of the second horizontal interface and the input end of the second conversion circuit, the fourth pin of the first horizontal interface is connected to the fourth pin of the second horizontal interface and the input end of the first conversion circuit, and the fifth pin of the first horizontal interface is connected to the fifth pin of the second horizontal interface and the motor power supply end; the output ends of the first conversion circuit, the second conversion circuit, the third conversion circuit and the fourth conversion circuit are all connected to the main control chip.

9. The functional testing device for multi-channel PCBA according to claim 8, characterized in that: The first conversion circuit includes a fourth switch tube, a fifth switch tube, a thirteenth resistor, a fourteenth resistor and a fifteenth resistor; The gate of the fourth switch tube is connected to one end of the thirteenth resistor, one end of the fourteenth resistor, the source of the fifth switch tube and the fourth pin of the first horizontal interface; the drain of the fourth switch tube is connected to one end of the fifteenth resistor, the source of the fifth switch tube and the MSC1_D2_PC12 pin of the main control chip; the source of the fourth switch tube is connected to the drain of the fifth switch tube, the other end of the fourteenth resistor and the ground; the other end of the thirteenth resistor is connected to the second power supply end, and the other end of the fifteenth resistor is connected to the third power supply end.

10. A testing method using the functional testing device of the multi-channel PCBA according to claim 1, characterized in that: Includes steps: After power-on, configure test information and initialize functional test equipment and DC power equipment; Start the functional test, process and judge the collected functional signals, and output the test results to the host computer for display; Determine whether to continue the test. If yes, return to the previous step; otherwise, exit the test.

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