Device for on-board diagnosis and maintenance of GNSS (Global Navigation Satellite System) module

Abstract

The utility model relates to the technical field of satellite navigation application, and discloses a device for on-board diagnosis and maintenance of a GNSS (Global Navigation Satellite System) module. A spring probe interface circuit and a pin header interface circuit; a power conversion circuit; a UART data transmission direction switching circuit; according to the utility model, the spring probe is directly connected with the pin bonding pad of the target module, so that the module does not need to be disassembled and does not depend on a test point on a board, the target module can be diagnosed and maintained simply, conveniently and quickly, and batch processing can be carried out. Due to the characteristics, the system is particularly suitable for being used during customer field technical support, and conventional work such as data acquisition, problem analysis and firmware upgrading can be rapidly carried out; a plurality of function selection switches, such as power supply selection, voltage selection, data direction selection and interface type selection, are designed, so that diagnosis and maintenance means are more flexible and more universal.

Description

TECHNICAL FIELD

[0001] The utility model relates to satellite navigation application technical field, concretely is a device for GNSS module on board diagnosis and maintenance. BACKGROUND

[0002] At present, in the equipment of Beidou positioning application, Beidou positioning unit in the form of module is often used. When module works abnormally, firmware needs upgrading and the like, after being attached to target mainboard, module needs to be diagnosed and maintained by taking measures;

[0003] Common methods are two: one is that module is disassembled and then is placed on the special test fixture to detect;Second, test points are reserved on customer's mainboard, and detection is carried out through special fixture or flying wire bonding. The above two methods have defects:

[0004] The method of disassembling module for fault diagnosis and maintenance has the following problems and defects:

[0005] 1. High-temperature hot air table is needed for disassembling module, and high-temperature disassembly operation requires higher experience of operator;

[0006] 2. High-temperature disassembly has certain influence on performance and appearance of customer's mainboard components, and even damages them, and some mainboards cannot be disassembled without damage;

[0007] 3. High-temperature disassembly may change the original fault problem, and may also introduce new fault, causing deviation of fault cause analysis;

[0008] 4. The test fixture of module has high manufacturing cost, and the number is very limited, so it is difficult to handle in customer's field in time, and the timeliness of fault analysis is affected;

[0009] 5. It cannot be processed in batches.

[0010] The method of reserving test points on mainboard for fault diagnosis and maintenance has the following problems and defects:

[0011] 1. The method needs to be implemented by customer in product design, and if test points are not reserved in design, it cannot be used;

[0012] 2. Reserving test points needs to occupy the space position of mainboard, and the test fixture of customer needs to support the use function of these test points in software and hardware;

[0013] 3. Mainboard often needs to be disassembled from the whole machine to be installed on the test fixture, and the workload is large;

[0014] 4. If the test fixture is not supported, it can only be processed through flying wire bonding, which is time-consuming and laborious, and cannot be processed in batches.

[0015] Therefore, we need to propose a device for on-board diagnosis and maintenance of GNSS module, without disassembling the module and relying on test points on the board, which can be batch processed; the means of diagnosis and maintenance are more flexible and more universal. Utility model content

[0016] The utility model discloses a device for on-board diagnosis and maintenance of GNSS module, and the spring probe is directly connected with the pin pad of target module, without disassembling the module and relying on test points on the board, which can conveniently and quickly diagnose and maintain target module and can be batch processed.

[0017] To realize the above-mentioned purpose, the utility model provides the following technical scheme: a device for on-board diagnosis and maintenance of GNSS module, comprising:

[0018] USB to UART circuit for communicating with PC and obtaining 5V power supply from PC;

[0019] Spring probe interface circuit connected with target module and pin interface circuit for UART data transceiving;

[0020] Power conversion circuit for converting 5V voltage obtained by USB into 3.3V or 1.8V voltage;

[0021] Still include UART data transmission direction switching circuit connected with pin interface circuit and used for data transceiving or data bidirectional monitoring;

[0022] The power conversion circuit, spring probe interface circuit, pin interface circuit, UART data transmission direction switching circuit are all connected with USB to UART circuit, the power conversion circuit is connected with pin interface circuit, and the spring probe interface circuit is connected with UART data transmission direction switching circuit.

[0023] Preferably, the USB to UART circuit includes wiring holder J1 and chip U1, one pin of the wiring holder J1 is connected with recoverable fuse F1, one end of the recoverable fuse F1 is connected with diode D1, capacitor C3, capacitor C4 and resistor R26, one end of the resistor R26 is connected with ground emitting diode D16;

[0024] The 2-pin of the terminal block J1 is connected with a diode D5 grounded and a resistor R4 connected to the 4-pin of the chip U1 respectively, and the 3-pin of the terminal block J1 is connected with a diode D4 grounded and a resistor R5 connected to the 3-pin of the chip U1 respectively.

[0025] Preferably, the power conversion circuit comprises a chip U2, the 1-pin and 2-pin of the chip U2 are connected to the 8-pin of the chip U1, a resistor R10 is connected to the 4-pin of the chip U2, and one end of the resistor R10 is connected with a switch S1 for selecting the converted voltage.

[0026] Preferably, the spring probe interface circuit comprises a terminal block J2, a triode Q1, a triode Q2, a triode Q3, a MOS tube V1 and a MOS tube V2, a resistor R7 is connected between the 3-pin of the triode Q1 and the 1-pin of the terminal block J2, a resistor R19 is connected between the 3-pin of the triode Q2 and the 6-pin of the terminal block J2, the 3-pin of the triode Q3 is connected to the 1-pin of the triode Q2, a resistor R14 is connected between the 3-pin of the MOS tube V1 and the 4-pin of the terminal block J2, a resistor R15 is connected between the 3-pin of the MOS tube V1 and the 5-pin of the terminal block J2, and a resistor R17 is connected between the 3-pin of the MOS tube V2 and the 6-pin of the terminal block J2.

[0027] Preferably, a resistor R9 is connected to the 1-pin of the triode Q1, one end of the resistor R9 is connected with a resistor R6 and a switch S3 for selecting the signal definition and arrangement order of the probe respectively, the 1-pin of the MOS tube V1 is connected to the 1-pin of the switch S3, and a switch S4 for selecting whether to output the power voltage is connected to the 2-pin of the MOS tube V1.

[0028] Preferably, the row pin interface circuit comprises a terminal block J3, a diode D13 is connected to the 1-pin of the terminal block J3, a diode D15 and a resistor R21 are connected to the 2-pin of the terminal block J3, and a diode D14 and a resistor R22 are connected to the 3-pin of the terminal block J3.

[0029] Preferably, the UART data transmission direction switching circuit comprises a chip U3 and a resistor R1 and a diode D2 connected in series, the 2-pin and 2-pin of the chip U3 are connected with a resistor R20 and a resistor R25, and one end of the diode D2 and the 1-pin of the chip U3 are connected with a switch S2 for data transceiving or data bidirectional monitoring.

[0030] Compared with the prior art, the utility model has the advantages that:

[0031] 1, The utility model discloses a spring probe is used with the pin pad of target module direct connection, need not to dismantle module, also does not rely on the test point on board, can simply, fast to the target module do diagnosis and maintenance to batch processing, owing to have this feature, especially suitable for using in customer field technical support, can fast carry out data acquisition, problem analysis and firmware upgrade etc. Regular work;

[0032] 2, The utility model discloses a plurality of function selection switch, such as power supply selection, voltage selection, data direction selection and interface type selection, make the means of diagnosis and maintenance more flexible, more general. DRAWINGS

[0033] Figure 1 It is the system block diagram of the utility model;

[0034] Figure 2 It is the circuit diagram of USB conversion UART circuit of the utility model;

[0035] Figure 3 It is the circuit diagram of power conversion circuit of the utility model;

[0036] Figure 4 It is the circuit diagram of spring probe interface circuit of the utility model;

[0037] Figure 5 It is the circuit diagram of pin interface circuit and UART data transmission direction switching circuit of the utility model. DETAILED DESCRIPTION

[0038] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0039] Please refer to Figures 1-5 The utility model provides a kind of technical scheme: a device for GNSS module on board diagnosis and maintenance, comprising:

[0040] USB conversion UART circuit for communicating with PC and obtaining 5V power supply from PC;

[0041] Spring probe interface circuit connected with target module and pin interface circuit for UART data transceiving;

[0042] Power conversion circuit for converting 5V voltage obtained by USB into 3.3V or 1.8V voltage;

[0043] The UART data transmission direction switching circuit is connected with the row pin interface circuit and is used for data transceiving or data bidirectional monitoring.

[0044] The power conversion circuit, the spring probe interface circuit, the row pin interface circuit and the UART data transmission direction switching circuit are electrically connected with the USB to UART circuit.

[0045] Generally, the UART contains two data lines of TXD (data transmission) and RXD (data reception) and is used for data transceiving with a target module to realize regular bidirectional communication. Another use scenario is that the target module in the device has data communication with a main controller, and when some abnormal conditions occur, the data to and from the target module and the main controller needs to be monitored to analyze the problem cause. In this demand, the data line of the UART of the device can be switched into two RXD (data reception) to simultaneously monitor the communication data of the target module and the main controller.

[0046] The commonly used packaging sizes of the target module are LCC-24pin (12.2x16.0mm) and LCC-18pin (10.1*9.7), and the pins of the module that need to be connected for testing are main power VDD, backup power VBAK, data transmission TXD and data reception RXD, and the arrangement of these pins on the two kinds of packaging is different. The device can be switched to the required arrangement order to adapt to the requirements of the two kinds of packaging.

[0047] The USB to UART circuit comprises a terminal block J1 and a chip U1, one pin of the terminal block J1 is connected with a resettable fuse F1, one end of the resettable fuse F1 is connected with a diode D1, a capacitor C3, a capacitor C4 and a resistor R26, one end of the resistor R26 is connected with a ground light emitting diode D16;

[0048] Two pins of the terminal block J1 are respectively connected with a ground diode D5 and a resistor R4 connected to the 4 pin of the chip U1, and the 3 pin of the terminal block J1 is respectively connected with a ground diode D4 and a resistor R5 connected to the 3 pin of the chip U1.

[0049] The terminal block J1 is a USB connection seat, which is a general interface of a PC and can conveniently provide power supply and data transmission. The device has low power consumption and low communication rate, and the USB interface can meet the working requirements of the device.

[0050] The connecting seat J1 is used for connecting the PC, the recoverable fuse F1 is used for abnormal short circuit protection, the diode D1 is a TVS diode and is used for power overvoltage protection; the diode D4 and the diode D5 are electrostatic discharge protection diodes and are used for ESD protection of the USB signal line; the chip U1 is a USB to UART chip and is used for converting the USB interface into the UART interface.

[0051] The USB is a general interface of the PC, and the serial port (UART, Universal Asynchronous Receiver / Transmitter) is a commonly used communication interface of the module, and the device uses the USB to UART chip to realize the bridging conversion of the USB and the UART.

[0052] The power conversion circuit includes the chip U2, the 1 pin and the 2 pin of the chip U2 are connected to the 8 pin of the chip U1, the 4 pin of the chip U2 is connected with the resistor R10, and one end of the resistor R10 is connected with the switch S1 used for selecting the converted voltage.

[0053] The 5 pin of the chip U2 is connected with the series-connected resistor R8 and resistor R11, the connection end of the resistor R8 and the resistor R11 is connected to the 4 pin of the chip U2, and the 5 pin of the chip U2 is also connected with the resistor FB1, the resistor FB2 and the capacitor C8 respectively.

[0054] Through the design of the switch S1, the 5V voltage obtained by the USB can be converted into 3.3V or 1.8V voltage.

[0055] The spring probe interface circuit includes the connecting seat J2, the triode Q1, the triode Q2, the triode Q3, the MOS tube V1 and the MOS tube V2, the 3 pin of the triode Q1 is connected with the 1 pin of the connecting seat J2 through the resistor R7, the 3 pin of the triode Q2 is connected with the 6 pin of the connecting seat J2 through the resistor R19, the 3 pin of the triode Q3 is connected with the 1 pin of the triode Q2, the 3 pin of the MOS tube V1 is connected with the 4 pin of the connecting seat J2 through the resistor R14, the 3 pin of the MOS tube V1 is connected with the 5 pin of the connecting seat J2 through the resistor R15, and the 3 pin of the MOS tube V2 is connected with the 6 pin of the connecting seat J2 through the resistor R17.

[0056] The 1 pin of the connecting seat J2 is connected with the diode D6, the 2 pin of the connecting seat J2 is connected with the diode D7, the 3 pin of the connecting seat J2 is connected with the diode D8, the 4 pin of the connecting seat J2 is connected with the diode D9, the 5 pin of the connecting seat J2 is connected with the diode D10, the 6 pin of the connecting seat J2 is connected with the diode D11, and the 7 pin of the connecting seat J2 is connected with the diode D12.

[0057] The spring probe is directly connected with the pin pad of the target module, without disassembling the module and relying on the test point on the board, so that the target module can be diagnosed and maintained simply and quickly, and batch processing can be performed.

[0058] The terminal J2 is a spring probe interface, in which the left side is the signal arrangement of the 1216 interface, from top to bottom, NC (no connection), UOUT0 (module data transmission), UIN0 (module data reception), VBAK (module standby power supply), VDD (module main power supply), and GND (ground); and the right side is the signal arrangement of the 1010 interface, in succession, GND, UOUT0, UIN0, NC, NC, VBAK, NC, and VDD.

[0059] The switch S3 is used for selecting the signal definition and arrangement order of the probe. When the switch S3 is connected, the first pin of S3 is at low level, Q1 is in the off state, and the first pin of the terminal J2 is in the suspended state; MOS tube V1 is in the on state, and MOS tube V1 can output power supply to the fourth and fifth pins of the terminal J2; the triode Q3 is in the off state, so that MOS tube V2 is cut off, the triode Q2 is turned on, the sixth pin of the terminal J2 is connected to the ground, and the signal arrangement of 1216 is realized.

[0060] Conversely, when the switch S3 is open, the triode Q1 is turned on, the first pin of the terminal J2 is grounded; the MOS tube V1 is cut off, and the fourth and fifth pins of the terminal J2 are in the suspended state; the MOS tube V2 is turned on, the triode Q2 is cut off, and the sixth pin of the terminal J2 can output the standby power supply VBAK, and the signal arrangement of 1010 is realized.

[0061] The switch S4 is used for selecting whether to output the power supply voltage.

[0062] The first pin of the triode Q1 is connected with the resistor R9, one end of the resistor R9 is connected with the resistor R6 and the switch S3 for selecting the signal definition and arrangement order of the probe, the first pin of the MOS tube V1 is connected to the first pin of the switch S3, and the second pin of the MOS tube V1 is connected with the switch S4 for selecting whether to output the power supply voltage.

[0063] The pin header interface circuit comprises the terminal J3, the first pin of the terminal J3 is connected with the diode D13, the second pin of the terminal J3 is connected with the diode D15 and the resistor R21, and the third pin of the terminal J3 is connected with the diode D14 and the resistor R22.

[0064] When the target device has reserved the interface for diagnosis and maintenance, or needs to collect data for a long time, the common pin header interface of the device can be used, and the common wire connection can be used.

[0065] The UART data transmission direction switching circuit comprises a chip U3, a resistor R1 and a diode D2 connected in series, the 2th pin of the chip U3 is connected with a resistor R20 and a resistor R25, and one end of the diode D2 is connected with the 1st pin of the chip U3 and is connected with a switch S2 for data transceiving or bidirectional data monitoring.

[0066] The UART data transmission direction switching circuit further comprises a resistor R2 and a diode D3 connected in series, one end of the diode D3 is connected with a resistor R23 and the 4th pin of the chip U3, and one end of the diode D3 is further connected with a resistor R24.

[0067] The diode D2 and the diode D3 are both light-emitting diodes, which are used for displaying whether there is data transmission on the TXD and RXD data lines, when there is data transmission, the LED will flash, and when there is no data transmission, the LED will not light.

[0068] The chip U3 is an AND gate chip, and the 4th pin is equal to the AND result of the 2nd and 3rd pins.

[0069] The switch S2, when the 2nd and 3rd pins of the switch S2 are connected, the TXD of the interface will be normally connected to the TXD of the USB-to-UART, and data can be sent to the module; when the 1st and 2nd pins of the switch S2 are connected, the TXD of the interface will be connected to the AND gate A input of the U3, and together with the RXD connected to the AND gate B input, the operation is output from the 4th pin of the chip U3, so as to realize the simultaneous monitoring of the external TXD and RXD data.

[0070] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. An apparatus for GNSS module on-board diagnosis and maintenance, characterized in that, The application relates to a USB-to-UART circuit for communicating with a PC and obtaining 5V power supply from the PC. The spring probe interface circuit connected with the target module and the pin interface circuit for UART data transceiving; The power conversion circuit for converting the 5V voltage obtained by the USB into 3.3V or 1.8V voltage; The UART data transmission direction switching circuit connected with the pin interface circuit and used for data transceiving or bidirectional data monitoring; The power conversion circuit, the spring probe interface circuit, the pin interface circuit and the UART data transmission direction switching circuit are electrically connected with the USB-to-UART circuit, the power conversion circuit is connected with the pin interface circuit, and the spring probe interface circuit is electrically connected with the UART data transmission direction switching circuit. The USB-to-UART circuit comprises a terminal block J1 and a chip U1, a recoverable fuse F1 is connected to the 1-pin of the terminal block J1, one end of the recoverable fuse F1 is connected with a diode D1, a capacitor C3, a capacitor C4 and a resistor R26, and one end of the resistor R26 is connected with a light-emitting diode D16 grounded.

2. The apparatus for diagnosis and maintenance of GNSS module on board according to claim 1, characterized in that: The 2-pin of the terminal block J1 is respectively connected with a diode D5 grounded and a resistor R4 connected to the 4-pin of the chip U1, and the 3-pin of the terminal block J1 is respectively connected with a diode D4 grounded and a resistor R5 connected to the 3-pin of the chip U1. The power conversion circuit comprises a chip U2, the 1-pin and the 2-pin of the chip U2 are connected to the 8-pin of the chip U1, a resistor R10 is connected to the 4-pin of the chip U2, and one end of the resistor R10 is connected with a switch S1 used for selecting the converted voltage.

3. The apparatus for diagnosing and maintaining GNSS module on board according to claim 1, characterized in that: The spring probe interface circuit comprises a terminal block J2, a triode Q1, a triode Q2, a triode Q3, a MOS tube V1 and a MOS tube V2, a resistor R7 is connected between the 3-pin of the triode Q1 and the 1-pin of the terminal block J2, a resistor R19 is connected between the 3-pin of the triode Q2 and the 6-pin of the terminal block J2, the 3-pin of the triode Q3 is connected to the 1-pin of the triode Q2, a resistor R14 is connected between the 3-pin of the MOS tube V1 and the 4-pin of the terminal block J2, a resistor R15 is connected between the 3-pin of the MOS tube V1 and the 5-pin of the terminal block J2, and a resistor R17 is connected between the 3-pin of the MOS tube V2 and the 6-pin of the terminal block J2.

4. The apparatus for on-board diagnosis and maintenance of GNSS module according to claim 1, wherein: A resistor R9 is connected to the 1-pin of the triode Q1, one end of the resistor R9 is respectively connected with a resistor R6 and a switch S3 used for selecting the signal definition and arrangement sequence of the probe, the 1-pin of the MOS tube V1 is connected to the 1-pin of the switch S3, and the 2-pin of the MOS tube V1 is connected with a switch S4 used for selecting whether to output the power supply voltage.

5. The apparatus for on-board diagnosis and maintenance of GNSS modules according to claim 4, characterized in that: The pin interface circuit comprises a terminal block J3, a diode D13 is connected to the 1-pin of the terminal block J3, a diode D15 and a resistor R21 are connected to the 2-pin of the terminal block J3, and a diode D14 and a resistor R22 are connected to the 3-pin of the terminal block J3.

6. The apparatus for on-board diagnosis and maintenance of GNSS modules according to claim 1, characterized in that: ​ 7. The apparatus for on-board diagnosis and maintenance of GNSS modules according to claim 6, characterized in that: The UART data transmission direction switching circuit comprises a chip U3, a resistor R1 and a diode D2 arranged in series, resistors R20 and R25 connected between the 2th pin and the 2th pin of the chip U3, and a data transceiving or bidirectional monitoring switch S2 connected between one end of the diode D2 and the 1th pin of the chip U3.

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