PCBA board test circuit

Abstract

The utility model discloses a PCBA board test circuit. The PCBA board test circuit comprises a control module, wherein the control module is used for being connected with an upper computer to display the condition that the test circuit detects that a PCBA board circuit to be tested is abnormal; the GPIO test circuit is connected with the control module, and the GPIO test circuit can be used for detecting whether signal input and output of a GPIO pin of the PCBA board to be tested are normal or not; the ADC detection circuit is connected with the control module, and the ADC detection circuit is used for detecting whether ADC pins of the PBCA board to be detected are normal or not; and the connection module comprises terminals, and the terminals are respectively connected with the ADC detection circuit, the GPIO test circuit and different models of PCBA board circuits to be tested.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of PCBA board, specifically relates to the field of PCBA board test circuit. BACKGROUND

[0002] PCBA is the abbreviation of Printed Circuit Board Assembly, that is, printed circuit board assembly. It is welded to the circuit board through SMT patch, DIP plug-in process, etc. Electronic components, forming a complete electronic product. PCBA board is the core component of electronic products, and its performance directly determines the function and reliability of the whole product.

[0003] In the PCBA production process, due to material defects or process problems, short circuit, open circuit, welding defects and other problems may occur. Through testing, these problems can be found and repaired in time to ensure product quality. Testing can verify whether the functions of PCBA are normal, such as GPIO input and output function, ADC pin reading value, etc., so as to ensure that the performance of the product meets the design requirements.

[0004] The mainstream test methods now include AOI test, X-ray detection, ICT test and FCT test. These test methods reduce test time and cost to a certain extent, but they also have certain defects. For example, they cannot adapt to different master control boards; only a single voltage detection is used when detecting voltage, resulting in inaccurate detection results; and the GPIO input and output detection method is relatively cumbersome. UTILITY MODEL CONTENT

[0005] In order to overcome the above technical defects, the utility model provides a PCBA board test circuit.

[0006] In order to solve the above problems, the utility model is realized according to the following technical scheme:

[0007] The PCBA board test circuit, comprising a control module, the control module is used for connecting the host computer display test circuit detects the abnormal situation of the PCBA board circuit to be tested;GPIO test circuit, the GPIO test circuit is connected with the control module, the GPIO test circuit can be used for detecting whether the signal input and output of the GPIO pin of the PCBA board to be tested are normal;ADC detection circuit, the ADC detection circuit is connected with the control module, and the ADC detection circuit is used for detecting whether the ADC pin of the PCBA board to be tested is normal;Connection module, the connection module comprises a terminal, and the terminal is connected with the ADC detection circuit, the GPIO test circuit and different models of PCBA board circuit to be tested respectively.

[0008] Further, the control module comprises a single-chip microcomputer, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an active crystal oscillator, a key, a first electrostatic protection diode, a second electrostatic protection diode, a three-hole terminal and a four-hole terminal;

[0009] The VDD_1 pin of the single-chip microcomputer, the VDDA pin of the single-chip microcomputer, the VDD_2 pin of the single-chip microcomputer and the VDD_3 pin of the single-chip microcomputer are connected to a power supply;

[0010] The VSSA pin of the single-chip microcomputer, the VSS_1 pin of the single-chip microcomputer and the VSS_2 pin of the single-chip microcomputer are grounded;

[0011] One side of the first resistor is connected to the PF7 pin of the single-chip microcomputer, and the other side of the first resistor is connected to a power supply;

[0012] One side of the second resistor is connected to the PF6 pin of the single-chip microcomputer, and the other side of the second resistor is grounded;

[0013] One side of the third resistor is connected to the BOOT0 pin of the single-chip microcomputer, and the other side of the third resistor is grounded;

[0014] One side of the fourth resistor is connected to the X2 pin of the active crystal oscillator and the PF0 pin of the single-chip microcomputer respectively, and the other side of the fourth resistor is connected to the X1 pin of the active crystal oscillator and the PF1 pin of the single-chip microcomputer;

[0015] One side of the first capacitor is connected to the X1 pin of the active crystal oscillator, and the other side of the first capacitor is connected to the GND2 pin of the active crystal oscillator and grounded;

[0016] One side of the second capacitor is connected to the X2 pin of the active crystal oscillator, and the other side of the second capacitor is connected to the GND1 pin of the active crystal oscillator and grounded;

[0017] The third pin of the key is connected to the NRST pin of the single-chip microcomputer, and the fourth pin of the key is grounded;

[0018] One side of the third capacitor is connected to the NRST pin of the single-chip microcomputer, and the other side of the third capacitor is grounded;

[0019] One side of the fifth resistor is connected to the NRST pin of the single-chip microcomputer, and the other side of the fifth resistor is connected to a power supply;

[0020] One side of the sixth resistor is connected to the PB10 pin of the single chip microcomputer, and the other side of the sixth resistor is connected to the third pin of the three-hole terminal;

[0021] One side of the seventh resistor is connected to the PB11 pin of the single chip microcomputer, and the other side of the seventh resistor is connected to the second pin of the three-hole terminal;

[0022] One side of the first electrostatic protection diode is connected to the second port of the three-hole terminal, and the other side of the first electrostatic protection diode is connected to the first pin of the three-hole terminal and is grounded;

[0023] One side of the second electrostatic protection diode is connected to the third port of the three-hole terminal, and the other side of the second electrostatic protection diode is grounded;

[0024] One side of the eighth resistor is connected to the PB10 pin of the single chip microcomputer, one side of the ninth resistor is connected to the PB11 pin of the single chip microcomputer, and the first port of the three-hole terminal is grounded;

[0025] The second port of the four-hole terminal is connected to the SWCLK pin of the single-chip microcomputer, the fourth port of the four-hole terminal is connected to the SWDIO pin of the single-chip microcomputer, and the third port of the four-hole terminal is grounded;

[0026] One side of the fourth capacitor is grounded, and the other side of the fourth capacitor is connected to the first port of the four-hole terminal and is connected to a power supply;

[0027] The fifth capacitor, the sixth capacitor, the seventh capacitor, the eighth capacitor, the ninth capacitor and the tenth capacitor are connected in parallel, one side of the fifth capacitor is connected to a power supply, and one side of the tenth capacitor is grounded.

[0028] Furthermore, the GPIO test circuit includes a plurality of tri-state transceivers, a plurality of pull-up resistors, and a decoupling capacitor circuit;

[0029] PB15 of the single chip microcomputer is respectively connected to the OE pins of the multiple tri-state transceivers;

[0030] PA8 of the single chip microcomputer is respectively connected to the DIR pins of the multiple tri-state transceivers;

[0031] The VCC pins of the plurality of tri-state transceivers are respectively connected to a power supply, and the GND pins of the plurality of tri-state transceivers are respectively grounded;

[0032] One side of the plurality of pull-up resistors is sequentially connected to the output ports of the plurality of tri-state transceivers, and the other sides of the plurality of pull-up resistors are all connected to a power supply;

[0033] The output ports of the plurality of tri-state transceivers are respectively connected to the GPIO pins of the connection module;

[0034] One side of the decoupling capacitor circuit is grounded, and the other side of the decoupling capacitor circuit is connected to the VCC pin of the plurality of tri-state transceivers and connected to a power supply.

[0035] Further, the decoupling capacitor circuit includes a plurality of decoupling capacitors.

[0036] The plurality of decoupling capacitors are connected in parallel, one side of a first capacitor in the plurality of decoupling capacitors is connected to the VCC pin of the plurality of tri-state transceivers and connected to a power supply, and the other side of the first capacitor is grounded. Further, the ADC detection circuit includes a first conversion circuit, a second conversion circuit, a third conversion circuit, and a voltage detection circuit.

[0037] The first conversion circuit is connected to the control module.

[0038] The second conversion circuit is connected to the control module.

[0039] The third conversion circuit is connected to the control module.

[0040] The voltage detection circuit is connected to the first conversion circuit, the second conversion circuit, and the third conversion circuit, respectively.

[0041] Further, the first conversion circuit includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a first field effect transistor, a first step-down DC-DC converter, a first inductor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, and a fourteenth capacitor.

[0042] One side of the ninth resistor is connected to the PB13 pin of the single-chip microcomputer, and the other side of the ninth resistor is connected to the first pin of the first field effect transistor.

[0043] One side of the tenth resistor is connected to the VIN pin of the first step-down DC-DC converter, and the other side of the tenth resistor is connected to the EN pin of the first step-down DC-DC converter and the third pin of the first field effect transistor, respectively, and the second pin of the first field effect transistor is grounded.

[0044] One side of the eleventh resistor is connected to the FB pin of the first step-down DC-DC converter, and the other side of the eleventh resistor is connected to one side of the first inductor, and the other side of the first inductor is connected to the LX pin of the first step-down DC-DC converter.

[0045] One side of the twelfth resistor is connected to the FB pin of the first step-down DC-DC converter, and the other side of the twelfth resistor is grounded.

[0046] One side of the eleventh capacitor is connected to the GND pin of the first buck DC-DC converter and grounded, and the other side of the eleventh capacitor is connected to the VIN pin of the first buck DC-DC converter and connected to a power supply;

[0047] One side of the twelfth capacitor is connected to the FB pin of the first buck DC-DC converter, and the other side of the twelfth capacitor is connected to one side of the first inductor;

[0048] One side of the thirteenth capacitor is connected to one side of the first inductor, and the other side of the thirteenth capacitor is grounded;

[0049] One side of the fourteenth capacitor is connected to one side of the first inductor, and the other side of the fourteenth capacitor is grounded.

[0050] Further, the second conversion circuit comprises a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a second field effect transistor, a second buck DC-DC converter, a second inductor, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor and an eighteenth capacitor;

[0051] One side of the thirteenth resistor is connected to the PB12 pin of the single-chip microcomputer, and the other side of the thirteenth resistor is connected to the second pin of the second field effect transistor;

[0052] One side of the fourteenth resistor is connected to the VIN pin of the second buck DC-DC converter, and the other side of the fourteenth resistor is respectively connected to the EN pin of the second buck DC-DC converter and the third pin of the second field effect transistor, and the second pin of the second field effect transistor is grounded;

[0053] One side of the fifteenth resistor is connected to the FB pin of the second buck DC-DC converter, and the other side of the fifteenth resistor is connected to one side of the second inductor, and the other side of the second inductor is connected to the LX pin of the second buck DC-DC converter;

[0054] One side of the sixteenth resistor is connected to the FB pin of the second buck DC-DC converter, and the other side of the sixteenth resistor is grounded;

[0055] One side of the fifteenth capacitor is connected to the GND pin of the second buck DC-DC converter and grounded, and the other side of the fifteenth capacitor is connected to the VIN pin of the second buck DC-DC converter and connected to a power supply;

[0056] One side of the sixteenth capacitor is connected to the FB pin of the second buck DC-DC converter, and the other side of the sixteenth capacitor is connected to one side of the second inductor;

[0057] One side of the seventeenth capacitor is connected to one side of the second inductor, and the other side of the seventeenth capacitor is grounded;

[0058] One side of the eighteenth capacitor is connected to one side of the second inductor, and the other side of the eighteenth capacitor is grounded.

[0059] Furthermore, the third conversion circuit includes a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a third field effect transistor, a third step-down DC-DC converter, a third inductor, a nineteenth capacitor, a twentieth capacitor, a twenty-first capacitor, and a twenty-second capacitor;

[0060] One side of the seventeenth resistor is connected to the PB14 pin of the single chip microcomputer, and the other side of the seventeenth resistor is connected to the second pin of the third field effect transistor;

[0061] One side of the eighteenth resistor is connected to the VIN pin of the third step-down DC-DC converter, and the other side of the eighteenth resistor is respectively connected to the EN pin of the third step-down DC-DC converter and the third pin of the third field effect transistor, and the second pin of the third field effect transistor is grounded;

[0062] One side of the nineteenth resistor is connected to the FB pin of the third step-down DC-DC converter, the other side of the nineteenth resistor is connected to one side of the third inductor, and the other side of the third inductor is connected to the LX pin of the third step-down DC-DC converter;

[0063] One side of the 20th resistor is connected to the FB pin of the third step-down DC-DC converter, and the other side of the 20th resistor is grounded;

[0064] One side of the nineteenth capacitor is connected to the GND pin of the third step-down DC-DC converter and is grounded, and the other side of the nineteenth capacitor is connected to the VIN pin of the third step-down DC-DC converter and is connected to a power supply;

[0065] One side of the 20th capacitor is connected to the FB pin of the third step-down DC-DC converter, and the other side of the 20th capacitor is connected to one side of the third inductor;

[0066] One side of the twenty-first capacitor is connected to one side of the third inductor, and the other side of the twenty-first capacitor is grounded;

[0067] One side of the 22nd capacitor is connected to one side of the third inductor, and the other side of the 22nd capacitor is grounded.

[0068] Further, the voltage detection circuit includes a first double diode, a second double diode, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor, a thirtieth resistor, a thirty-first resistor, a thirty-second resistor, a thirty-third resistor, a thirty-fourth resistor, a twenty-third capacitor, a twenty-fourth capacitor, a twenty-fifth capacitor, a twenty-sixth capacitor, and a copper core inductor;

[0069] One side of the twenty-first resistor is connected to a first pin of the first double diode and one side of the fourteenth capacitor, respectively, and the other side of the twenty-first resistor is connected to a third pin of the first double diode;

[0070] One side of the twenty-second resistor is connected to a second pin of the first double diode and one side of the eighteenth capacitor, respectively, and the other side of the twenty-second resistor is connected to a third pin of the first double diode and a third pin of the second double diode, respectively;

[0071] One side of the twenty-third resistor is connected to a first pin of the second double diode and one side of the twenty-second capacitor, respectively, and the other side of the twenty-third resistor is connected to a third pin of the second double diode;

[0072] One side of the twenty-third capacitor is connected to a third pin of the second double diode, and the other side of the twenty-third capacitor is grounded;

[0073] One side of the twenty-fourth capacitor is connected to a third pin of the second double diode and one side of the copper core inductor, respectively, and the other side of the twenty-fourth capacitor is grounded;

[0074] One side of the twenty-fifth capacitor is connected to the other side of the copper core inductor, and the other side of the twenty-fifth capacitor is grounded;

[0075] One side of the twenty-sixth capacitor is connected to the other side of the copper core inductor, and the other side of the twenty-sixth capacitor is grounded;

[0076] The twenty-fourth resistor, the twenty-fifth resistor, the twenty-sixth resistor, the twenty-seventh resistor, the twenty-eighth resistor, the twenty-ninth resistor, the thirtieth resistor, the thirty-first resistor, the thirty-second resistor, the thirty-third resistor, and the thirty-fourth resistor are connected in series, one side of the twenty-fourth resistor is connected to one side of the twenty-sixth capacitor, and one side of the thirty-fourth resistor is grounded;

[0077] A connection point between the twenty-fourth resistor and the twenty-fifth resistor is connected to an ADC1 pin of the connection module;

[0078] The connecting point between the twenty-fifth resistor and the twenty-sixth resistor connects the ADC2 pin of the connecting module;

[0079] The connecting point between the twenty-sixth resistor and the twenty-seventh resistor connects the ADC3 pin of the connecting module;

[0080] The connecting point between the twenty-seventh resistor and the twenty-eighth resistor connects the ADC4 pin of the connecting module;

[0081] The connecting point between the twenty-eighth resistor and the twenty-ninth resistor connects the ADC5 pin of the connecting module;

[0082] The connecting point between the twenty-ninth resistor and the thirtieth resistor connects the ADC6 pin of the connecting module;

[0083] The connecting point between the thirtieth resistor and the thirty-first resistor connects the ADC7 pin of the connecting module;

[0084] The connecting point between the thirty-first resistor and the thirty-second resistor connects the ADC8 pin of the connecting module;

[0085] The connecting point between the thirty-second resistor and the thirty-third resistor connects the ADC9 pin of the connecting module;

[0086] The connecting point between the thirty-third resistor and the thirty-fourth resistor connects the ADC10 pin of the connecting module.

[0087] Compared with the prior art, the utility model has the advantages that:

[0088] The utility model provides a PCBA board detection circuit including control module, control module is used for controlling GPIO test circuit and ADC detection circuit, GPIO test circuit is connected control module, and GPIO test circuit can be used for detecting whether the input and output of the GPIO pin of the PCBA board to be measured are normal, ADC detection circuit is connected control module, and ADC detection circuit is used for detecting whether the ADC pin of the PBCA board to be measured is normal, connecting module includes a plurality of multi -pin terminals, and the plurality of multi -pin terminals are connected respectively ADC detection circuit, GPIO test circuit and different model PCBA board circuit to be measured.

[0089] The GPIO test circuit of the patent matches all the pins on the PCBA board that can be configured as GPIOs into GPIOs, controls the input and output direction of the GPIOs through the eight-way bus transceiver in tri-state output, and thus detects whether the GPIO input and output function is normal; the ADC test circuit can detect the change of each reading value of the ADC pin of the PCBA board under test through different voltage values to confirm whether the reading value of the ADC pin is normal, and the accuracy is higher than that of single voltage multiple continuous reading values; the connection module can adapt to different models of PCBA boards, and the pin definition and interface of each different model of PCBA board are different, and are all converted into consistent interfaces through the connection module. BRIEF DESCRIPTION OF DRAWINGS

[0090] The specific embodiments of the utility model will be further described in detail below in combination with the drawings, wherein:

[0091] Fig. 1 is the connection module circuit diagram of the utility model;

[0092] Fig. 2 is the GPIO test circuit diagram of the utility model;

[0093] Fig. 3 is the ADC detection circuit diagram of the utility model;

[0094] In the drawing: 1-connection module, 2-GPIO test circuit, 3-ADC detection circuit. DETAILED DESCRIPTION

[0095] The preferred embodiments of the utility model will be described below in combination with the drawings, and it should be understood that the preferred embodiments described here are only used to illustrate and explain the utility model, and are not used to limit the utility model.

[0096] As Figs. 1-3 indicated, the preferred structure of the PCBA board test circuit of the utility model.

[0097] The PCBA board test circuit of the utility model comprises a control module, the control module is used for connecting a host computer to display the situation that the test circuit detects the abnormality of the PCBA board under test, a GPIO test circuit, the GPIO test circuit is connected with the control module, the GPIO test circuit can be used to detect whether the signal input and output of the GPIO pin of the PCBA board under test is normal, an ADC detection circuit, the ADC detection circuit is connected with the control module, and the ADC detection is used to detect whether the ADC pin of the PBCA board under test is normal, and a connection module, the connection module comprises a terminal, and the terminal is connected with the ADC detection circuit, the GPIO test circuit and the different models of PCBA board circuit under test respectively.

[0098] The control module comprises a single-chip microcomputer, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an active crystal oscillator, a key, a first electrostatic protection diode, a second electrostatic protection diode, a three-hole terminal and a four-hole terminal;

[0099] The VDD_1 pin of the single-chip microcomputer, the VDDA pin of the single-chip microcomputer, the VDD_2 pin of the single-chip microcomputer and the VDD_3 pin of the single-chip microcomputer are all connected to a power supply;

[0100] The VSSA pin of the single-chip microcomputer, the VSS_1 pin of the single-chip microcomputer and the VSS_2 pin of the single-chip microcomputer are all grounded;

[0101] One side of the first resistor is connected to the PF7 pin of the single-chip microcomputer, and the other side of the first resistor is connected to a power supply;

[0102] One side of the second resistor is connected to the PF6 pin of the single-chip microcomputer, and the other side of the second resistor is grounded;

[0103] One side of the third resistor is connected to the BOOT0 pin of the single-chip microcomputer, and the other side of the third resistor is grounded;

[0104] One side of the fourth resistor is connected to the X2 pin of the active crystal oscillator and the PF0 pin of the single-chip microcomputer respectively, and the other side of the fourth resistor is connected to the X1 pin of the active crystal oscillator and the PF1 pin of the single-chip microcomputer;

[0105] One side of the first capacitor is connected to the X1 pin of the active crystal oscillator, and the other side of the first capacitor is connected to the GND2 pin of the active crystal oscillator and grounded;

[0106] One side of the second capacitor is connected to the X2 pin of the active crystal oscillator, and the other side of the second capacitor is connected to the GND1 pin of the active crystal oscillator and grounded;

[0107] The third pin of the key is connected to the NRST pin of the single-chip microcomputer, and the fourth pin of the key is grounded;

[0108] One side of the third capacitor is connected to the NRST pin of the single-chip microcomputer, and the other side of the third capacitor is grounded;

[0109] One side of the fifth resistor is connected to the NRST pin of the single-chip microcomputer, and the other side of the fifth resistor is connected to a power supply;

[0110] One side of the sixth resistor is connected to the PB10 pin of the single-chip microcomputer, and the other side of the sixth resistor is connected to the third pin of the three-hole terminal;

[0111] One side of the seventh resistor is connected to the PB11 pin of the single-chip microcomputer, and the other side of the seventh resistor is connected to the second pin of the three-hole terminal;

[0112] One side of the first electrostatic protection diode is connected to the second port of the three-hole terminal, the other side of the first electrostatic protection diode is connected to the first pin of the three-hole terminal, and is grounded;

[0113] One side of the second electrostatic protection diode is connected to the third port of the three-hole terminal, and the other side of the second electrostatic protection diode is grounded;

[0114] One side of the eighth resistor is connected to the PB10 pin of the single-chip microcomputer, one side of the ninth resistor is connected to the PB11 pin of the single-chip microcomputer, and the first port of the three-hole terminal is grounded;

[0115] The second port of the four-hole terminal is connected to the SWCLK pin of the single-chip microcomputer, the fourth port of the four-hole terminal is connected to the SWDIO pin of the single-chip microcomputer, and the third port of the four-hole terminal is grounded;

[0116] One side of the fourth capacitor is grounded, the other side of the fourth capacitor is connected to the first port of the four-hole terminal, and is connected to the power supply;

[0117] The fifth capacitor, the sixth capacitor, the seventh capacitor, the eighth capacitor, the ninth capacitor and the tenth capacitor are connected in parallel, one side of the fifth capacitor is connected to the power supply, and one side of the tenth capacitor is grounded.

[0118] As shown in the figure, the GPIO test circuit includes a plurality of tri-state transceivers, a plurality of pull-up resistors, and a decoupling capacitor circuit. Fig. 1 The PB15 of the single-chip microcomputer is respectively connected to the OE pin of the plurality of tri-state transceivers; the PA8 of the single-chip microcomputer is respectively connected to the DIR pin of the plurality of tri-state transceivers; the VCC pin of the plurality of tri-state transceivers is respectively connected to the power supply, and the GND pin of the plurality of tri-state transceivers is respectively grounded; one side of the plurality of pull-up resistors is connected to the output port of the plurality of tri-state transceivers in turn, and the other side of the plurality of pull-up resistors is connected to the power supply; the output port of the plurality of tri-state transceivers is respectively connected to the GPIO pin of the connection module; one side of the decoupling capacitor circuit is grounded, and the other side of the decoupling capacitor circuit is connected to the VCC pin of the plurality of tri-state transceivers and the power supply.

[0119]

[0120] ​The decoupling capacitor circuit comprises a plurality of decoupling capacitors; the plurality of decoupling capacitors are connected in parallel, one side of a first capacitor in the plurality of decoupling capacitors is connected to a VCC pin of the plurality of tri-state transceivers and a power supply, and the other side of the first capacitor is grounded.

[0121] Fig. 2 The ADC detection circuit comprises a first conversion circuit, a second conversion circuit, a third conversion circuit and a voltage detection circuit; the first conversion circuit is connected to the control module, the second conversion circuit is connected to the control module, the third conversion circuit is connected to the control module, and the voltage detection circuit is connected to the first conversion circuit, the second conversion circuit and the third conversion circuit respectively.

[0122] The first conversion circuit comprises a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a first field effect transistor, a first step-down DC-DC converter, a first inductor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor and a fourteenth capacitor;

[0123] One side of the ninth resistor is connected to a PB13 pin of the single-chip microcomputer, and the other side of the ninth resistor is connected to a first pin of the first field effect transistor;

[0124] One side of the tenth resistor is connected to a VIN pin of the first step-down DC-DC converter, the other side of the tenth resistor is connected to an EN pin of the first step-down DC-DC converter and a third pin of the first field effect transistor respectively, and a second pin of the first field effect transistor is grounded;

[0125] One side of the eleventh resistor is connected to a FB pin of the first step-down DC-DC converter, the other side of the eleventh resistor is connected to one side of the first inductor, and the other side of the first inductor is connected to a LX pin of the first step-down DC-DC converter;

[0126] One side of the twelfth resistor is connected to a FB pin of the first step-down DC-DC converter, and the other side of the twelfth resistor is grounded;

[0127] One side of the eleventh capacitor is connected to a GND pin of the first step-down DC-DC converter and grounded, and the other side of the eleventh capacitor is connected to a VIN pin of the first step-down DC-DC converter and a power supply;

[0128] One side of the twelfth capacitor is connected to a FB pin of the first step-down DC-DC converter, and the other side of the twelfth capacitor is connected to one side of the first inductor;

[0129] One side of the thirteenth capacitor is connected to one side of the first inductor, and the other side of the thirteenth capacitor is grounded.

[0130] One side of the fourteenth capacitor is connected to one side of the first inductor, and the other side of the fourteenth capacitor is grounded.

[0131] The second conversion circuit comprises a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a second field effect tube, a second step-down DC-DC converter, a second inductor, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor and an eighteenth capacitor.

[0132] One side of the thirteenth resistor is connected to the PB12 pin of the single-chip microcomputer, and the other side of the thirteenth resistor is connected to the second pin of the second field effect tube.

[0133] One side of the fourteenth resistor is connected to the VIN pin of the second step-down DC-DC converter, and the other side of the fourteenth resistor is respectively connected to the EN pin of the second step-down DC-DC converter and the third pin of the second field effect tube, and the second pin of the second field effect tube is grounded.

[0134] One side of the fifteenth resistor is connected to the FB pin of the second step-down DC-DC converter, and the other side of the fifteenth resistor is connected to one side of the second inductor, and the other side of the second inductor is connected to the LX pin of the second step-down DC-DC converter.

[0135] One side of the sixteenth resistor is connected to the FB pin of the second step-down DC-DC converter, and the other side of the sixteenth resistor is grounded.

[0136] One side of the fifteenth capacitor is connected to the GND pin of the second step-down DC-DC converter and grounded, and the other side of the fifteenth capacitor is connected to the VIN pin of the second step-down DC-DC converter and connected to a power supply.

[0137] One side of the sixteenth capacitor is connected to the FB pin of the second step-down DC-DC converter, and the other side of the sixteenth capacitor is connected to one side of the second inductor.

[0138] One side of the seventeenth capacitor is connected to one side of the second inductor, and the other side of the seventeenth capacitor is grounded.

[0139] One side of the eighteenth capacitor is connected to one side of the second inductor, and the other side of the eighteenth capacitor is grounded.

[0140] The third conversion circuit comprises a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a third field effect transistor, a third step-down DC-DC converter, a third inductor, a nineteenth capacitor, a twentieth capacitor, a twenty-first capacitor and a twenty-second capacitor;

[0141] One side of the seventeenth resistor is connected to a PB14 pin of the single-chip microcomputer, and the other side of the seventeenth resistor is connected to a second pin of the third field effect transistor;

[0142] One side of the eighteenth resistor is connected to a VIN pin of the third step-down DC-DC converter, and the other side of the eighteenth resistor is respectively connected to an EN pin of the third step-down DC-DC converter and a third pin of the third field effect transistor, and the second pin of the third field effect transistor is grounded;

[0143] One side of the nineteenth resistor is connected to an FB pin of the third step-down DC-DC converter, and the other side of the nineteenth resistor is connected to one side of the third inductor, and the other side of the third inductor is connected to an LX pin of the third step-down DC-DC converter;

[0144] One side of the twentieth resistor is connected to the FB pin of the third step-down DC-DC converter, and the other side of the twentieth resistor is grounded;

[0145] One side of the nineteenth capacitor is connected to a GND pin of the third step-down DC-DC converter and grounded, and the other side of the nineteenth capacitor is connected to a VIN pin of the third step-down DC-DC converter and connected to a power supply;

[0146] One side of the twentieth capacitor is connected to the FB pin of the third step-down DC-DC converter, and the other side of the twentieth capacitor is connected to one side of the third inductor;

[0147] One side of the twenty-first capacitor is connected to one side of the third inductor, and the other side of the twenty-first capacitor is grounded;

[0148] One side of the twenty-second capacitor is connected to one side of the third inductor, and the other side of the twenty-second capacitor is grounded.

[0149] The voltage detection circuit comprises a first double diode, a second double diode, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor, a thirtieth resistor, a thirty-first resistor, a thirty-second resistor, a thirty-third resistor, a thirty-fourth resistor, a twenty-third capacitor, a twenty-fourth capacitor, a twenty-fifth capacitor, a twenty-sixth capacitor and a copper core inductor;

[0150] One side of the twenty-first resistor is connected with the first pin of the first dual diode and one side of the fourteenth capacitor respectively, and the other side of the twenty-first resistor is connected with the third pin of the first dual diode;

[0151] One side of the twenty-second resistor is connected with the second pin of the first dual diode and one side of the eighteenth capacitor respectively, and the other side of the twenty-second resistor is connected with the third pin of the first dual diode and the third pin of the second dual diode respectively;

[0152] One side of the twenty-third resistor is connected with the first pin of the second dual diode and one side of the twenty-second capacitor respectively, and the other side of the twenty-third resistor is connected with the third pin of the second dual diode;

[0153] One side of the twenty-third capacitor is connected with the third pin of the second dual diode, and the other side of the twenty-third capacitor is grounded;

[0154] One side of the twenty-fourth capacitor is connected with the third pin of the second dual diode and one side of the copper core inductor respectively, and the other side of the twenty-fourth capacitor is grounded;

[0155] One side of the twenty-fifth capacitor is connected with the other side of the copper core inductor, and the other side of the twenty-fifth capacitor is grounded;

[0156] One side of the twenty-sixth capacitor is connected with the other side of the copper core inductor, and the other side of the twenty-sixth capacitor is grounded;

[0157] The twenty-fourth resistor, the twenty-fifth resistor, the twenty-sixth resistor, the twenty-seventh resistor, the twenty-eighth resistor, the twenty-ninth resistor, the thirtieth resistor, the thirty-first resistor, the thirty-second resistor, the thirty-third resistor and the thirty-fourth resistor are connected in series in turn, one side of the twenty-fourth resistor is connected with one side of the twenty-sixth capacitor, and one side of the thirty-fourth resistor is grounded;

[0158] The connecting point between the twenty-fourth resistor and the twenty-fifth resistor is connected with the ADC1 pin of the connection module;

[0159] The connecting point between the twenty-fifth resistor and the twenty-sixth resistor is connected with the ADC2 pin of the connection module;

[0160] The connecting point between the twenty-sixth resistor and the twenty-seventh resistor is connected with the ADC3 pin of the connection module;

[0161] The connecting point between the twenty-seventh resistor and the twenty-eighth resistor is connected with the ADC4 pin of the connection module;

[0162] The connecting point between the twenty-eighth resistor and the twenty-ninth resistor is connected with an ADC5 pin of the connecting module;

[0163] The connecting point between the twenty-ninth resistor and the thirtieth resistor is connected with an ADC6 pin of the connecting module;

[0164] The connecting point between the thirtieth resistor and the thirty-first resistor is connected with an ADC7 pin of the connecting module;

[0165] The connecting point between the thirty-first resistor and the thirty-second resistor is connected with an ADC8 pin of the connecting module;

[0166] The connecting point between the thirty-second resistor and the thirty-third resistor is connected with an ADC9 pin of the connecting module;

[0167] The connecting point between the thirty-third resistor and the thirty-fourth resistor is connected with an ADC10 pin of the connecting module.

[0168] Wherein, the connecting module is not only used to connect the ADC detection circuit and the GPIO test circuit, but also can be used to connect other function detection modules. The utility model detects whether the PCBA board ADC pin voltage, the GPIO test circuit input and output are normal and the PCBA board card power and other functions, and displays through the connection host computer, so that the detection personnel can find problems in time and return to repair or do scrap processing.

[0169] In a specific implementation, the patent control module controls the ADC detection circuit, when the ADC pin of the PCBA board is connected with the ADC detection circuit, the different voltage output by the ADC detection circuit is read, whether the pin is normal is judged, 10-way ADC detection is supported, and the accuracy of multiple continuous reading is higher.

[0170] On the other hand, three conversion circuits respectively output 1.28V, 1.44V and 1.8V for the ADC pin reading of the PCBA board, which is used for detecting whether the ADC pin of the PCBA board to be detected is abnormal, and three different voltage values are set to make the detection more accurate.

[0171] On the other hand, the voltage detection circuit sets 10-way ADC detection, compared with single reading, the accuracy of multiple continuous reading is high.

[0172] The patent control module controls the GPIO test circuit, when all the pins of the PCBA board that can be configured as GPIO are all configured as GPIO pins, and the input and output directions of the GPIO are controlled through the eight-way bus transceiver of the tri-state output, the GPIO input and output function can be effectively detected whether it is normal, so as to ensure the stable operation of the system.

[0173] The patent connection module can connect the GPIO test circuit and the ADC detection circuit of the test circuit, and can also be adapted to different models of PCBA boards, and can also be used to connect other external detection circuits.

[0174] The working principle of the PCBA board test circuit is that different models of PCBA boards can be connected to the ADC detection circuit and the GPIO test circuit through the connection module, the ADC pin of the PCBA board receives different voltage signals, and through the input, sampling, quantization and coding, and digital signal output of the analog signal, whether it is normal is determined through the host computer display; the PCBA board is connected to the GPIO test circuit through the connection module, and the eight-way bus transceiver of the tri-state output is used to control the GPIO input and output direction, so that whether the GPIO input and output function is normal can be effectively detected; the abnormal board can be repaired or scrapped according to the corresponding situation.

[0175] Other structures of the PCBA board test circuit in the embodiment are refered to the prior art.

[0176] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form, so any modification, equivalent change and modification of the above embodiment according to the technical essence of the utility model, which does not deviate from the technical solution content of the utility model, still belongs to the scope of the technical solution of the utility model.

Claims

1. A PCBA board test circuit, characterized in that: include: A control module, the control module is used to connect to the host computer to display the test circuit to detect abnormalities in the circuit of the PCBA board to be tested; A GPIO test circuit, connected to the control module, for detecting whether the signal input and output of the GPIO pins of the PCBA to be tested are normal; An ADC detection circuit, the ADC detection circuit being connected to the control module, and the ADC detection circuit being used to detect whether the ADC pin of the PBCA board to be tested is normal; A connection module includes terminals, which are respectively connected to an ADC detection circuit, a GPIO test circuit, and different types of PCBA board circuits to be tested.

2. A PCBA board test circuit according to claim 1, characterized in that: The control module includes a single chip microcomputer, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an active crystal oscillator, a button, a first electrostatic protection diode, a second electrostatic protection diode, a three-hole terminal and a four-hole terminal; The VDD_1 pin of the single-chip microcomputer, the VDDA pin of the single-chip microcomputer, the VDD_2 pin of the single-chip microcomputer, and the VDD_3 pin of the single-chip microcomputer are all connected to a power supply; The VSSA pin of the single chip microcomputer, the VSS_1 pin of the single chip microcomputer and the VSS_2 pin of the single chip microcomputer are all grounded; One side of the first resistor is connected to the PF7 pin of the single chip microcomputer, and the other side of the first resistor is connected to the power supply; One side of the second resistor is connected to the PF6 pin of the single chip microcomputer, and the other side of the second resistor is grounded; One side of the third resistor is connected to the BOOT0 pin of the single chip microcomputer, and the other side of the third resistor is grounded; One side of the fourth resistor is connected to the X2 pin of the active crystal oscillator and the PF0 pin of the single-chip microcomputer, and the other side of the fourth resistor is connected to the X1 pin of the active crystal oscillator and the PF1 pin of the single-chip microcomputer; One side of the first capacitor is connected to the X1 pin of the active crystal oscillator, and the other side of the first capacitor is connected to the GND2 pin of the active crystal oscillator and is grounded; One side of the second capacitor is connected to the X2 pin of the active crystal oscillator, and the other side of the second capacitor is connected to the GND1 pin of the active crystal oscillator and is grounded; The third pin of the button is connected to the NRST pin of the single chip microcomputer, and the fourth pin of the button is grounded; One side of the third capacitor is connected to the NRST pin of the single chip microcomputer, and the other side of the third capacitor is grounded; One side of the fifth resistor is connected to the NRST pin of the single chip microcomputer, and the other side of the fifth resistor is connected to the power supply; One side of the sixth resistor is connected to the PB10 pin of the single chip microcomputer, and the other side of the sixth resistor is connected to the third pin of the three-hole terminal; One side of the seventh resistor is connected to the PB11 pin of the single chip microcomputer, and the other side of the seventh resistor is connected to the second pin of the three-hole terminal; One side of the first electrostatic protection diode is connected to the second port of the three-hole terminal, and the other side of the first electrostatic protection diode is connected to the first pin of the three-hole terminal and is grounded; One side of the second electrostatic protection diode is connected to the third port of the three-hole terminal, and the other side of the second electrostatic protection diode is grounded; One side of the eighth resistor is connected to the PB10 pin of the single chip microcomputer, one side of the ninth resistor is connected to the PB11 pin of the single chip microcomputer, and the first port of the three-hole terminal is grounded; The second port of the four-hole terminal is connected to the SWCLK pin of the single-chip microcomputer, the fourth port of the four-hole terminal is connected to the SWDIO pin of the single-chip microcomputer, and the third port of the four-hole terminal is grounded; One side of the fourth capacitor is grounded, and the other side of the fourth capacitor is connected to the first port of the four-hole terminal and is connected to a power supply; The fifth capacitor, the sixth capacitor, the seventh capacitor, the eighth capacitor, the ninth capacitor and the tenth capacitor are connected in parallel, one side of the fifth capacitor is connected to a power supply, and one side of the tenth capacitor is grounded.

3. A PCBA board test circuit according to claim 2, characterized in that: The GPIO test circuit includes a plurality of tri-state transceivers, a plurality of pull-up resistors, and a decoupling capacitor circuit; PB15 of the single chip microcomputer is respectively connected to the OE pins of the multiple tri-state transceivers; PA8 of the single chip microcomputer is respectively connected to the DIR pins of the multiple tri-state transceivers; The VCC pins of the plurality of tri-state transceivers are respectively connected to a power supply, and the GND pins of the plurality of tri-state transceivers are respectively grounded; One side of the plurality of pull-up resistors is sequentially connected to the output ports of the plurality of tri-state transceivers, and the other sides of the plurality of pull-up resistors are all connected to a power supply; The output ports of the multiple tri-state transceivers are respectively connected to the GPIO pins of the connection module; One side of the decoupling capacitor circuit is grounded, and the other side of the decoupling capacitor circuit is connected to the VCC pins of the multiple tri-state transceivers and is also connected to a power supply.

4. A PCBA board test circuit according to claim 3, characterized in that: The decoupling capacitor circuit includes a plurality of decoupling capacitors; The decoupling capacitors are connected in parallel, one side of a first capacitor among the decoupling capacitors is connected to the VCC pins of the tri-state transceivers and a power supply, and the other side of the first capacitor among the decoupling capacitors is grounded.

5. The PCBA board test circuit according to claim 2, characterized in that: The ADC detection circuit includes a first conversion circuit, a second conversion circuit, a third conversion circuit and a voltage detection circuit; The first conversion circuit is connected to the control module; The second conversion circuit is connected to the control module; The third conversion circuit is connected to the control module; The voltage detection circuit is connected to the first conversion circuit, the second conversion circuit, the third conversion circuit and the connection module respectively.

6. A PCBA board test circuit according to claim 5, characterized in that: The first conversion circuit includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a first field effect transistor, a first step-down DC-DC converter, a first inductor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, and a fourteenth capacitor; One side of the ninth resistor is connected to the PB13 pin of the single chip microcomputer, and the other side of the ninth resistor is connected to the first pin of the first field effect transistor; One side of the tenth resistor is connected to the VIN pin of the first step-down DC-DC converter, and the other side of the tenth resistor is respectively connected to the EN pin of the first step-down DC-DC converter and the third pin of the first field effect transistor, and the second pin of the first field effect transistor is grounded; One side of the eleventh resistor is connected to the FB pin of the first step-down DC-DC converter, the other side of the eleventh resistor is connected to one side of the first inductor, and the other side of the first inductor is connected to the LX pin of the first step-down DC-DC converter; One side of the twelfth resistor is connected to the FB pin of the first step-down DC-DC converter, and the other side of the twelfth resistor is grounded; One side of the eleventh capacitor is connected to the GND pin of the first step-down DC-DC converter and is grounded, and the other side of the eleventh capacitor is connected to the VIN pin of the first step-down DC-DC converter and is connected to a power supply; One side of the twelfth capacitor is connected to the FB pin of the first step-down DC-DC converter, and the other side of the twelfth capacitor is connected to one side of the first inductor; One side of the thirteenth capacitor is connected to one side of the first inductor, and the other side of the thirteenth capacitor is grounded; One side of the fourteenth capacitor is connected to one side of the first inductor, and the other side of the fourteenth capacitor is grounded.

7. The PCBA board test circuit according to claim 5, characterized in that: The first conversion circuit includes a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a second field effect transistor, a second step-down DC-DC converter, a second inductor, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, and an eighteenth capacitor; One side of the thirteenth resistor is connected to the PB12 pin of the single chip microcomputer, and the other side of the thirteenth resistor is connected to the second pin of the second field effect transistor; One side of the fourteenth resistor is connected to the VIN pin of the second step-down DC-DC converter, and the other side of the fourteenth resistor is respectively connected to the EN pin of the second step-down DC-DC converter and the third pin of the second field effect transistor, and the second pin of the second field effect transistor is grounded; One side of the fifteenth resistor is connected to the FB pin of the second step-down DC-DC converter, the other side of the fifteenth resistor is connected to one side of the second inductor, and the other side of the second inductor is connected to the LX pin of the second step-down DC-DC converter; One side of the sixteenth resistor is connected to the FB pin of the second step-down DC-DC converter, and the other side of the sixteenth resistor is grounded; One side of the fifteenth capacitor is connected to the GND pin of the second step-down DC-DC converter and is grounded, and the other side of the fifteenth capacitor is connected to the VIN pin of the second step-down DC-DC converter and is connected to a power supply; One side of the sixteenth capacitor is connected to the FB pin of the second step-down DC-DC converter, and the other side of the sixteenth capacitor is connected to one side of the second inductor; One side of the seventeenth capacitor is connected to one side of the second inductor, and the other side of the seventeenth capacitor is grounded; One side of the eighteenth capacitor is connected to one side of the second inductor, and the other side of the eighteenth capacitor is grounded.

8. The PCBA board test circuit according to claim 5, characterized in that: The first conversion circuit includes a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a third field-effect transistor, a third step-down DC-DC converter, a third inductor, a nineteenth capacitor, a twentieth capacitor, a twenty-first capacitor, and a twenty-second capacitor; One side of the seventeenth resistor is connected to the PB14 pin of the single chip microcomputer, and the other side of the seventeenth resistor is connected to the second pin of the third field effect transistor; One side of the eighteenth resistor is connected to the VIN pin of the third step-down DC-DC converter, and the other side of the eighteenth resistor is respectively connected to the EN pin of the third step-down DC-DC converter and the third pin of the third field effect transistor, and the second pin of the third field effect transistor is grounded; One side of the nineteenth resistor is connected to the FB pin of the third step-down DC-DC converter, the other side of the nineteenth resistor is connected to one side of the third inductor, and the other side of the third inductor is connected to the LX pin of the third step-down DC-DC converter; One side of the 20th resistor is connected to the FB pin of the third step-down DC-DC converter, and the other side of the 20th resistor is grounded; One side of the nineteenth capacitor is connected to the GND pin of the third step-down DC-DC converter and is grounded, and the other side of the nineteenth capacitor is connected to the VIN pin of the third step-down DC-DC converter and is connected to a power supply; One side of the 20th capacitor is connected to the FB pin of the third step-down DC-DC converter, and the other side of the 20th capacitor is connected to one side of the third inductor; One side of the twenty-first capacitor is connected to one side of the third inductor, and the other side of the twenty-first capacitor is grounded; One side of the 22nd capacitor is connected to one side of the third inductor, and the other side of the 22nd capacitor is grounded.

9. A PCBA board test circuit according to any one of claims 5 to 8, characterized in that: The voltage detection circuit includes a first double diode, a second double diode, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor, a thirtieth resistor, a thirty-first resistor, a thirty-second resistor, a thirty-third resistor, a thirty-fourth resistor, a twenty-third capacitor, a twenty-fourth capacitor, a twenty-fifth capacitor, a twenty-sixth capacitor and a copper core inductor; One side of the twenty-first resistor is connected to the first pin of the first dual diode and one side of the fourteenth capacitor respectively, and the other side of the twenty-first resistor is connected to the third pin of the first dual diode; One side of the twenty-second resistor is respectively connected to the second pin of the first double diode and one side of the eighteenth capacitor, and the other side of the twenty-second resistor is respectively connected to the third pin of the first double diode and the third pin of the second double diode; One side of the twenty-third resistor is connected to the first pin of the second dual diode and one side of the twenty-second capacitor respectively, and the other side of the twenty-third resistor is connected to the third pin of the second dual diode; One side of the twenty-third capacitor is connected to the third pin of the second dual diode, and the other side of the twenty-third capacitor is grounded; One side of the twenty-fourth capacitor is connected to the third pin of the second dual diode and one side of the copper core inductor respectively, and the other side of the twenty-fourth capacitor is grounded; One side of the twenty-fifth capacitor is connected to the other side of the copper core inductor, and the other side of the twenty-fifth capacitor is grounded; One side of the twenty-sixth capacitor is connected to the other side of the copper core inductor, and the other side of the twenty-sixth capacitor is grounded; the twenty-fourth resistor, the twenty-fifth resistor, the twenty-sixth resistor, the twenty-seventh resistor, the twenty-eighth resistor, the twenty-ninth resistor, the thirtieth resistor, the thirty-first resistor, the thirty-second resistor, the thirty-third resistor, and the thirty-fourth resistor are sequentially connected in series, one side of the twenty-fourth resistor is connected to one side of the twenty-sixth capacitor, and one side of the thirty-fourth resistor is grounded; The connection point between the twenty-fourth resistor and the twenty-fifth resistor is connected to the ADC1 pin of the connection module; The connection point between the twenty-fifth resistor and the twenty-sixth resistor is connected to the ADC2 pin of the connection module; The connection point between the twenty-sixth resistor and the twenty-seventh resistor is connected to the ADC3 pin of the connection module; The connection point between the twenty-seventh resistor and the twenty-eighth resistor is connected to the ADC4 pin of the connection module; The connection point between the twenty-eighth resistor and the twenty-ninth resistor is connected to the ADC5 pin of the connection module; The connection point between the 29th resistor and the 30th resistor is connected to the ADC6 pin of the connection module; The connection point between the 30th resistor and the 31st resistor is connected to the ADC7 pin of the connection module; A connection point between the thirty-first resistor and the thirty-second resistor is connected to the ADC8 pin of the connection module; The connection point between the thirty-second resistor and the thirty-third resistor is connected to the ADC9 pin of the connection module; The connection point between the thirty-third resistor and the thirty-fourth resistor is connected to the ADC10 pin of the connection module.

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