A test board for verifying a beidou gnss chip interface

Abstract

The utility model discloses a kind of test board of big dipper GNSS chip interface verification, comprising: main control MCU, fixed on the circuit board of test board, its IO interface is led out by the first row pin of double-row needle base;Big dipper GNSS chip, fixed on the circuit board of test board, the IO interface of the big dipper GNSS chip is connected with the second row pin of double-row needle base;Jumper cap, for selectively connecting the MCU end of double-row needle base with GNSS chip end, to configure the IO interface of main control MCU and the IO interface connection of big dipper GNSS chip;Power interface, for the main control MCU and big dipper GNSS chip power supply.The utility model is connected with jumper cap by double-row needle base and rigid plug, realize the electrical connection of the IO interface of big dipper GNSS chip and main control MCU IO interface stability, can avoid the test error caused by unreliable flexible cable contact, and test reliability is good.

Description

Technical Field

[0001] This utility model relates to satellite navigation chip testing, and more particularly to a test board for verifying the interface of a Beidou GNSS chip. Background Technology

[0002] A GNSS (Global Navigation Satellite System) chip is an integrated circuit used to receive and process signals from satellites. It can determine the precise coordinates of any location on Earth by analyzing the signals transmitted by satellites.

[0003] The Beidou GNSS chip has standard input / output interfaces such as UART, I2C, SPI, CAN, and USB. After the chip sample is made, interface verification is required to ensure that each interface function meets the design requirements and to prepare for mass production.

[0004] like Figure 1 As shown, the traditional method of testing interfaces is to use a general-purpose MCU development board and connect it to a test board with a Beidou GNSS chip attached via DuPont wires. However, the DuPont wire connection has problems such as poor contact, easy loosening, and susceptibility to interference. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a test board for verifying the interface of a Beidou GNSS chip with good reliability.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is a test board for verifying the interface of a Beidou GNSS chip, comprising: The main control MCU is fixed on the circuit board of the test board, and its I / O interface is brought out through the first row of pins of the double row of pin headers; The Beidou GNSS chip is fixed on the circuit board of the test board, and the IO interface of the Beidou GNSS chip is connected to the second row of pins of the double-row pin header. A jumper cap is used to selectively connect the MCU end of the dual-row pin header to the GNSS chip end, in order to configure the connection between the I / O interface of the main control MCU and the I / O interface of the Beidou GNSS chip; The power interface is used to supply power to the main control MCU and the Beidou GNSS chip.

[0007] The test board described above has a main control MCU with I / O interfaces including UART, I2C, SPI, CAN, USB, and GPIO interfaces, which are brought out through the first row of pins of the dual-row pin header. The Beidou GNSS chip has I / O interfaces including UART, I2C, SPI, CAN, USB, and GPIO interfaces, which are connected to the second row of pins of the dual-row pin header. The interface types connected to the second row of pins correspond one-to-one with the interface types connected to the first row of pins.

[0008] The test board described above uses an STM32 series MCU as its main control MCU, and the Beidou GNSS chip is mounted on the circuit board of the test board via a socket, which is soldered to the circuit board of the test board.

[0009] The test board described above includes a communication interface, which includes a UART to RJ45 interface, a USB to UART interface, and / or a TF card interface. The UART to RJ45 interface is used for network communication with a host computer, the USB to UART interface is used for serial communication with a PC or other peripherals, and the TF card interface is used to connect a TF card to store test data.

[0010] The test board described above includes a human-machine interface, which includes an external display screen or status indicator light. The display screen or status indicator light communicates with the main control MCU through a UART to RJ45 interface or a USB to UART interface.

[0011] The test board described above includes a JTAG debugging interface, which is connected to the main control MCU and used for program burning and debugging.

[0012] The test board described above includes a human-machine interface comprising buttons or a touchscreen. The buttons or touchscreen are connected to the main control MCU module via GPIO or I2C interfaces for manual control of the test process.

[0013] The test board described above includes an antenna interface, which is used to connect the BeiDou GNSS chip to an external antenna.

[0014] The test board described above uses a standard pin header with a 2.54mm pitch.

[0015] The test board described above includes a temperature sensor interface, which is connected to the main control MCU.

[0016] This invention achieves a stable electrical connection between the IO interface of the Beidou GNSS chip and the IO interface of the main control MCU through the rigid insertion of double-row pin headers and jumper caps. This avoids test errors caused by unreliable contact of flexible cables and ensures high test reliability. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a block diagram of the existing GNSS chip interface verification and testing circuit.

[0019] Figure 2 This is a structural block diagram of the Beidou GNSS chip interface test board according to an embodiment of this utility model. Detailed Implementation

[0020] The structure of the Beidou GNSS chip interface verification test board in this embodiment of the utility model is as follows: Figure 2 As shown, it includes a circuit board, a main control MCU, a Beidou GNSS chip, jumper caps, a communication interface, an ANT antenna interface, a temperature sensor interface, and a human-machine interface.

[0021] The main control MCU is fixed on the circuit board of the test board, and its I / O interface is brought out through the first row of pins of the dual-row header. The main control MCU is an STM32 series MCU, model STM32F446RET6.

[0022] The BeiDou GNSS chip is fixed to the circuit board of the test board in the form of a GNSS module. All I / O ports of the BeiDou GNSS chip are led to the module and connected to a dual-row pin header. The I / O interface of the BeiDou GNSS chip is connected to the second row of pins of the dual-row pin header. During installation, the BeiDou GNSS chip is mounted on the circuit board of the test board via a socket, which is soldered to the circuit board of the test board.

[0023] Jumper caps are used to selectively connect the MCU end of the dual-row pin header to the GNSS chip end to configure the connection between the I / O interface of the main control MCU and the I / O interface of the Beidou GNSS chip.

[0024] The power interface is used to supply power to the main control MCU and the Beidou GNSS chip.

[0025] The main control MCU's I / O interfaces include UART, I2C, SPI, CAN, USB, and GPIO interfaces, which are brought out through the first row of pins in a dual-row header. The Beidou GNSS chip's I / O interfaces include UART, I2C, SPI, CAN, USB, and GPIO interfaces, which are connected to the second row of pins in a dual-row header, and the interface types connected to the second row of pins correspond one-to-one with the interface types connected to the first row of pins.

[0026] The communication interfaces include a UART to RJ45 interface, a USB to UART interface, a TF card interface, and a JTAG debugging interface. The UART to RJ45 interface is used for network communication with the host computer, the USB to UART interface is used for serial communication with a PC or other peripherals, the TF card interface is used to connect a TF card to store test data, and the JTAG debugging interface connects to the main control MCU for program burning and debugging.

[0027] The human-machine interface includes an external display screen or status indicator light, which communicates with the main control MCU via a UART to RJ45 interface or a USB to UART interface.

[0028] The human-machine interface may also include buttons or a touch screen, which are connected to the main control MCU module via GPIO or I2C interfaces for manual control of the test process.

[0029] The ANT antenna interface is used to connect the BeiDou GNSS chip to an external antenna. The temperature sensor interface connects to the main control MCU.

[0030] The connection methods between the main control MCU and each interface are as follows: The UART1 interface (PA9 / PA10) connects to a UART to RJ45 interface; the UART2 interface (PA2 / PA3) connects to a USB to UART interface; the SPI1 interface (PA5 / PA6 / PA7) connects to a TF card interface; the JTAG interface (PA13 / PA14 / PB3 / PB4) connects to a JTAG debugging interface; the ADC1 interface (PC0) connects to a temperature sensor interface; the GPIO interface (PB12 / PB13) connects to buttons or a touchscreen; and the I2C1 interface (PB6 / PB7) connects to status indicator lights.

[0031] The UART to RJ45 interface is implemented using a dedicated network protocol chip, communicating with the main control MCU module via UART1 (PA9 / PA10). The USB to UART interface is implemented using a CH340G chip, communicating with the main control MCU via UART2 (PA2 / PA3). The TF card interface connects to the main control MCU via SPI1 (PA5 / PA6 / PA7), supporting the SDIO protocol. The standard 20-pin connector of the JTAG debug interface connects to the JTAG pins (PA13 / PA14 / PB3 / PB4) of the main control MCU. The buttons or touchscreen connect to the main control MCU via GPIO (PB12 / PB13), supporting interrupt triggering. The status indicator lights connect to the main control MCU via I2C1 (PB6 / PB7), using a PCA9532 driver chip to control multiple LEDs.

[0032] During testing, when it is necessary to verify a specific interface (UART, SPI, I2C, USB, CAN, GPIO, etc.), the relevant interface of the Beidou GNSS chip is connected to the relevant interface of the STM32 via jumper caps (not shown in the diagram). The main control MCU communicates with the Beidou GNSS chip through its own interfaces (UART, SPI, I2C, USB, CAN, GPIO, etc.) to verify whether the Beidou GNSS chip's interfaces (UART, SPI, I2C, USB, CAN, GPIO, etc.) meet the common interface standard definitions of UART, SPI, I2C, USB, CAN, GPIO, etc., and whether there are any errors or defects. The verification results are output through the communication interface and / or the human-machine interface.

[0033] Comparison table of the embodiments of this utility model and the prior art:

[0034] The BeiDou GNSS chip interface verification test board of the above embodiments of this utility model has the following beneficial effects: 1) Improved test reliability: Contact resistance is reduced to <10mΩ (DuPont wires are typically >50mΩ); enhanced vibration resistance, suitable for harsh environments such as automotive.

[0035] 2) Interface configuration efficiency optimization: Interface switching time is reduced from minutes (re-line) to seconds (jumper cap plugging and unplugging); supports rapid verification of full interface coverage (UART / I2C / SPI / CAN, etc.).

[0036] 3) Cost and resource savings: Avoid developing test boards repeatedly for different interface combinations; jumper caps and headers are standardized components, resulting in low procurement and maintenance costs.

[0037] 4) Good scalability and compatibility: It can be adapted to the interface definitions of GNSS chips from different manufacturers through jumper caps; when adding a test interface, only the number of pin headers needs to be increased, without modifying the PCB layout.

Claims

1. A test board for verifying the interface of a Beidou GNSS chip, characterized in that, include: The main control MCU is fixed on the circuit board of the test board, and its I / O interface is brought out through the first row of pins of the double row of pin headers; The Beidou GNSS chip is fixed on the circuit board of the test board, and the IO interface of the Beidou GNSS chip is connected to the second row of pins of the double-row pin header. A jumper cap is used to selectively connect the MCU end of the dual-row pin header to the GNSS chip end, in order to configure the connection between the I / O interface of the main control MCU and the I / O interface of the Beidou GNSS chip; The power interface is used to supply power to the main control MCU and the Beidou GNSS chip.

2. The test board according to claim 1, characterized in that, The main control MCU's IO interfaces include UART, I2C, SPI, CAN, USB, and GPIO interfaces, which are brought out through the first row of pins of the dual-row pin header. The Beidou GNSS chip's IO interfaces include UART, I2C, SPI, CAN, USB, and GPIO interfaces, which are connected to the second row of pins of the dual-row pin header. The interface types connected to the second row of pins correspond one-to-one with the interface types connected to the first row of pins.

3. The test board according to claim 1, characterized in that, The main control MCU is an STM32 series MCU, and the Beidou GNSS chip is mounted on the circuit board of the test board via a socket, which is soldered to the circuit board of the test board.

4. The test board according to claim 1, characterized in that, It includes communication interfaces, including a UART to RJ45 interface, a USB to UART interface, and / or a TF card interface; the UART to RJ45 interface is used for network communication with the host computer, the USB to UART interface is used for serial communication with a PC or other peripherals, and the TF card interface is used to connect a TF card to store test data.

5. The test board according to claim 1, characterized in that, It includes a human-machine interface, which includes an external display screen or status indicator light. The display screen or status indicator light communicates with the main control MCU through a UART to RJ45 interface or a USB to UART interface.

6. The test board according to claim 4, characterized in that, The communication interface includes a JTAG debugging interface, which is connected to the main control MCU and used for program burning and debugging.

7. The test board according to claim 5, characterized in that, The human-machine interface includes buttons or a touch screen, which are connected to the main control MCU module via GPIO or I2C interface for manual control of the test process.

8. The test board according to claim 1, characterized in that, It includes an antenna interface, which is used to connect the BeiDou GNSS chip to an external antenna.

9. The test board according to claim 1, characterized in that, The dual-row pin header uses a standard pin header with a 2.54mm pitch.

10. The test board according to claim 1, characterized in that, It includes a temperature sensor interface, which is connected to the main control MCU.

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