Three-axis acceleration sensor circuit and three-axis accelerometer

Abstract

The utility model discloses a three-axis acceleration sensor circuit and a three-axis accelerometer. The three-axis acceleration sensor circuit comprises an MCU module, an acceleration sensor module and a linear voltage stabilization module. The MCU module is provided with a first power supply end, a first input end and a first output end, the acceleration sensor module is provided with a second power supply end and a second output end, the second output end of the acceleration sensor module is connected with the first input end of the MCU module, and the linear voltage stabilization module is provided with a third output end. The third output end of the linear voltage stabilization module is connected with the first power end of the MCU module and the second power end of the acceleration sensor module. By integrating the acceleration sensor module, the MCU module and the linear voltage stabilization module, the acceleration of an object in the three-axis direction can be detected in real time, the influence of power supply noise is reduced, the accuracy of signal acquisition is improved, the integration level is improved, the power consumption is reduced, the size is reduced, and stable operation in a complex environment can be ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to sensor technical field, especially a kind of three-axis acceleration sensor circuit and three-axis accelerometer. BACKGROUND

[0002] At present, many systems based on three-axis accelerometer are applied to various intelligent devices, cars, robots and industrial controls. However, there are still some problems in actual use: first, the power management circuit adopts a simple voltage stabilizing scheme, which is easily affected by external electromagnetic interference, resulting in that power noise cannot be completely suppressed; second, there is a large error in output data in high dynamic or vibration environment; third, complex wiring and connection are required, resulting in large overall volume, high power consumption and large space occupation. SUMMARY

[0003] The utility model aims at at least solving one of the technical problems existing in prior art. To this end, the utility model provides a three-axis acceleration sensor circuit and a three-axis accelerometer, which integrates an acceleration sensor module, an MCU module and a linear voltage stabilizing module, reduces the influence of power noise, improves the accuracy of signal acquisition, improves the integration, reduces power consumption and volume, and ensures stable operation in complex environment.

[0004] In one aspect, the utility model embodiment provides a three-axis acceleration sensor circuit, which comprises:

[0005] An MCU module, which has a first power supply end, a first input end and a first output end;

[0006] An acceleration sensor module, which has a second power supply end and a second output end, and the second output end of the acceleration sensor module is connected to the first input end of the MCU module;

[0007] A linear voltage stabilizing module, which has a third output end, and the third output end of the linear voltage stabilizing module is connected to the first power supply end of the MCU module and the second power supply end of the acceleration sensor module, respectively.

[0008] According to some embodiments of the utility model, the MCU module has a plurality of SPI bus pins serving as the first input end, and the second output end of the acceleration sensor module is connected to the SPI bus pins through the MCU module.

[0009] According to some embodiments of the utility model, the MCU module has a plurality of IO interfaces, and the plurality of IO interfaces are used to control the threshold setting of each axis of the acceleration sensor module.

[0010] According to some embodiments of the utility model, the MCU module adopts integrated circuit with model number N32L403KBQ7.

[0011] According to some embodiments of the utility model, the third power supply end of the acceleration sensor module is connected with a first filter network.

[0012] According to some embodiments of the utility model, the output end of the linear voltage stabilizing module is connected with a second filter network, the second filter network comprises a plurality of parallelly connected filter capacitors, the first connecting end of the plurality of parallelly connected filter capacitors is connected with the output end of the linear voltage stabilizing module, and the second connecting end of the plurality of parallelly connected filter capacitors is connected with the reference voltage end.

[0013] According to some embodiments of the utility model, the linear voltage stabilizing module comprises a voltage stabilizing chip, a first filter capacitor, a second filter capacitor and a third filter capacitor, the first filter capacitor is connected at the input end of the voltage stabilizing chip, and the second filter capacitor and the third filter capacitor are parallelly connected at the output end of the voltage stabilizing chip.

[0014] According to some embodiments of the utility model, the voltage stabilizing chip adopts integrated circuit with model number TPNCP500SN33T1G.

[0015] According to some embodiments of the utility model, the three-axis acceleration sensor circuit further comprises an LED indicating lamp module, the LED indicating lamp module has a second input end, the second input end of the LED indicating lamp module is connected with the LED interface of the MCU module, the LED indicating lamp module comprises a first resistor and a light emitting diode, the first end of the first resistor is electrically connected with the LED interface, the second end of the first resistor is electrically connected with the light emitting diode, and the cathode of the light emitting diode is grounded.

[0016] On the other hand, the utility model embodiment provides a three-axis accelerometer, comprising the above three-axis acceleration sensor circuit.

[0017] The utility model embodiment has at least the following beneficial effects:

[0018] The linear voltage stabilizing module of the utility model embodiment provides stable voltage signals for the MCU module and the acceleration sensor module, and the MCU module processes and outputs the signals of the acceleration sensor module. The three-axis acceleration sensor circuit realized by integrating the acceleration sensor module, the MCU module and the linear voltage stabilizing module can detect the acceleration of an object in three-axis directions in real time, reduce the influence of power supply noise, improve the accuracy of signal acquisition, improve the integration, reduce power consumption, reduce the volume, and ensure stable operation in complex environments.

[0019] The additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter in the description of embodiments of the present application, which will be described with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description of embodiments, taken in conjunction with the accompanying drawings, in which:

[0021] Figure 1 A principle block diagram of a three-axis acceleration sensor circuit of the embodiment of the present application is shown in the figure.

[0022] Figure 2 A circuit principle diagram of an MCU module of the three-axis acceleration sensor circuit is shown in the figure. Figure 1

[0023] Figure 3 A circuit principle diagram of an acceleration sensor module of the three-axis acceleration sensor circuit is shown in the figure. Figure 1

[0024] Figure 4 A circuit principle diagram of a linear voltage stabilizing module of the three-axis acceleration sensor circuit is shown in the figure. Figure 1

[0025] Figure 5 A circuit principle diagram of an LED indicator lamp module of the three-axis acceleration sensor circuit is shown in the figure. Figure 1 DETAILED DESCRIPTION

[0026] The embodiments of the present application will be described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary only, and are for the purpose of explanation of the present application, and are not to be understood as limiting the present application.

[0027] In the description of the present application, the meaning of "several" is one or more, the meaning of "multiple" is two or more, greater than, less than, more than, etc. are understood as not including the number, "above", "below", "within", etc. are understood as including the number. If there is a description of "first", "second", etc. is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of indicated technical features.

[0028] In the description of the present application, unless otherwise explicitly limited, the words "set", "connected", etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application according to the specific content of the technical solution.​​​​

[0029] The embodiment discloses a three-axis acceleration sensor circuit. Please refer to Figures 1 to 4 , the three-axis acceleration sensor circuit includes an MCU module 100, an acceleration sensor module 200 and a linear voltage stabilizing module 400. The MCU module 100 has a first power supply end, a first input end and a first output end, the acceleration sensor module 200 has a second power supply end and a second output end, and the linear voltage stabilizing module 400 has a third output end. The second output end of the acceleration sensor module 200 is connected to the first input end of the MCU module 100, and the output end of the linear voltage stabilizing module 400 is connected to the first power supply end of the MCU module 100 and the second power supply end of the acceleration sensor module 200, respectively. The linear voltage stabilizing module 400 provides stable voltage signals for the MCU module 100 and the acceleration sensor module 200, and the MCU module 100 processes the signals of the acceleration sensor module 200 and outputs them. The three-axis acceleration sensor circuit realized by integrating the acceleration sensor module 200, the MCU module 100 and the linear voltage stabilizing module 400 reduces the influence of power supply noise, improves the accuracy of signal acquisition, improves the integration, reduces the power consumption, reduces the volume, and ensures stable operation in complex environments.

[0030] Please refer to Figure 1 and Figure 2 , the MCU module 100 is responsible for processing signals from the acceleration sensor module 200, wherein the MCU module 100 has a plurality of SPI bus pins serving as the first input end, and is connected to the second output end of the acceleration sensor module 200 through the SPI bus pins. The MCU module 100 collects and processes the three-axis original signals of the acceleration sensor module 200 through the SPI bus. The MCU module 100 outputs the processed data through the first output end (such as the UART interface), and these data are crucial for monitoring the acceleration of an object.

[0031] Please refer to Figure 2 , the MCU module 100 adopts an integrated circuit with the model N32L403KBQ7, and the MCU module 100 provides rich peripheral interfaces, such as the SPI interface (such as the pins marked by MISO, MOSI, SCK and CSB in Figure 2 ) which can be used for communication with external sensors or other peripheral devices; for example, the UART interface (such as the pins marked by UART_RXD2 and UART_TXD2 in Figure 2 ) provides a serial communication interface for debugging or communication with external modules; for example, the SWD (serial wire debugging) interface provides convenience for debugging and updating firmware. The serial bus is used for communication with other devices, enhancing the expansibility and flexibility of the system.

[0032] Please refer toFigure 2 The MCU module 100 has multiple IO interfaces 110, which are used to control the threshold settings of the various axes of the acceleration sensor module 200. For example, three IO interfaces 110 are provided on the PA9, PB0, and PB1 pins of the MCU module 100, and can be customized. For example, these three IO interfaces 110 are used to control the threshold settings of the three axes of the acceleration sensor module 200.

[0033] Please refer to Figure 2 The PD14-OSC_IN and PD15-OSC_OUT pins of the MCU module 100 are used to connect to an external crystal oscillator circuit. The NRST pin is connected to a resistor R57, which limits current flow to prevent excessive current from flowing through certain circuit components, such as LEDs or sensors, thereby protecting these components from damage. The VDDA pin is connected to a 3.3V input power supply for powering and resetting the MCU. The PDO-BOOT0 pin is connected to a pull-up resistor R3 to set the boot mode.

[0034] Please refer to Figure 3The acceleration sensor module 200 adopts an integrated circuit with model number SCA3300, which can detect the acceleration of an object in three directions of X-axis, Y-axis and Z-axis in real time. For example, the VDD pin and the DVIO pin of the acceleration sensor module 200 are connected to the 3.3V power supply stably output by the linear voltage stabilizing module 400 and the filter capacitor C4 and the filter capacitor C3, for decoupling of the power supply end, filtering of high-frequency noise of the power supply signal and ensuring stable power supply. The AVSS pin, the A EXTC pin, the RESERVED pin, the D EXTC pin, the EMC GND pin and the DVSS pin of the acceleration sensor module 200 are connected to the GND node, ensuring the ground loop of the circuit to be closed and the ground of the analog part and the digital part respectively, ensuring electrical isolation and good signal processing of different parts in the circuit. Among them, the A EXTC pin and the D EXTC pin are each connected to a capacitor and then connected to GND, for filtering of specific signal lines and further suppression of the influence of noise on signal transmission. The CSB pin of the acceleration sensor module 200 is connected to the SPI pin of the MCU module 100, and when the CSB chip selection signal is at a low level, it indicates that the communication between the MCU module 100 and the acceleration sensor module 200 is enabled. The MISO pin of the acceleration sensor module 200 transmits the collected data to the MCU module 100 through the SPI bus, and the MCU module 100 receives the data through the MISO pin. The SCK pin of the acceleration sensor module 200 is used for the MCU module 100 to send configuration commands or control signals to the acceleration sensor module 200. The MOSI pin of the acceleration sensor module 200 is used to send data to the accelerometer. The SCK pin of the acceleration sensor module 200 is used to synchronize the transmission of SPI data and is connected to the SCK pin of the MCU module 100; the SCK pin of the MCU module 100 provides a clock pulse to ensure the synchronicity of data transmission.

[0035] Please refer to Figure 3, the third power supply terminal of the acceleration sensor module 200 is connected to a first filtering network. For example, a filter capacitor C1 is arranged at the A_EXTC pin of the acceleration sensor module 200, a filter capacitor C2 is arranged at the D_EXTC pin, a capacitor filter C3 is arranged at the DVIO pin, and a filter capacitor C4 is arranged at the VDD pin. Among them, the filter capacitor C1, the filter capacitor C2, the filter capacitor C3 and the filter capacitor C4 are all chip capacitors with 0402 package specifications. The first end of the filter capacitor C1 is connected in parallel to the A_EXTC pin, and the second end is connected to the GND node; the first end of the filter capacitor C2 is connected in parallel to the D_EXTC pin, and the second end is connected to the GND node; the connection node of the first end of the filter capacitor C3 is connected in parallel to the 3.3V node and the DVIO pin, and the second end is connected to the GND node; the connection node of the first end of the filter capacitor C4 is connected in parallel to the 3.3V node and the VDD pin, and the second end is connected to the GND node. The integrity, accuracy and stability of the signal during transmission are guaranteed by capacitor filtering. These capacitors help reduce noise and interference, thereby improving the accuracy of accelerometer module 200 measurements. These capacitors are crucial for ensuring clear and accurate data, filtering out high-frequency noise that can affect sensor readings. 0402 chip capacitors, due to their small size and high-density mounting capabilities, provide effective filtering performance in tight spaces. Their compact design makes them suitable for space-constrained applications.

[0036] Please refer to Figure 4 In order to ensure the stable operation of the MCU module 100 and the acceleration sensor module 200, the linear voltage regulator module 400 provides a stable voltage, which stably reduces the input voltage to 3.3V output. A number of decoupling capacitors (such as Figure 5 A second filtering network is connected to the output of the linear voltage regulator module 400 (capacitors labeled C5 and C6), to reduce the impact of power supply noise on the system. This second filtering network comprises multiple filter capacitors connected in parallel (e.g., capacitors labeled C5 and C6). The first terminals of these filter capacitors are connected to the output of the linear voltage regulator module 400, and the second terminals of these filter capacitors are connected to the reference voltage terminal. The selection and arrangement of these capacitors plays a crucial role in the stability of the entire circuit, reducing power supply noise within the linear voltage regulator module 400 and improving system stability and reliability.

[0037] Please refer to Figure 4The linear voltage stabilizing module 400 comprises a voltage stabilizing chip, a first filter capacitor, a second filter capacitor and a third filter capacitor. The first filter capacitor is connected to the input end of the voltage stabilizing chip. The second filter capacitor and the third filter capacitor are connected in parallel to the output end of the voltage stabilizing chip. The voltage stabilizing chip is exemplarily an integrated circuit with a model number of TPNCP500SN33T1G, which converts a 5V input voltage into a 3.3V voltage for output. The first filter capacitor is shown as C7 in the figure, the second filter capacitor is shown as C5 in the figure, and the third filter capacitor is shown as C6 in the figure. The LDO_VCC input voltage is connected to the VIN input pin of the voltage stabilizer chip U10 after being decoupled by the capacitor C7. The EN enable pin of the linear voltage stabilizing module 400 is used to control the opening or closing of the voltage stabilizer, and the EN enable pin is pulled down to the ground through the resistor R12. The output end of the linear voltage stabilizing module 400 has two decoupling capacitors C5 and C6 for smoothing the output and ensuring the stability of the power supply. The 3.3V voltage output by the linear voltage stabilizing module 400 is supplied to the MCU module 100 and the acceleration sensor module 200 to ensure the stability of the entire circuit system. The power supply decoupling and filtering design effectively prevents power supply noise and interference, ensuring that the system can work normally in a complex power supply environment.

[0038] Please refer to Figure 5 The LED indicator module 300 has a second input end, and the second input end of the LED indicator module 300 is connected with the LED interface of the MCU module 100. The LED indicator module 300 exemplarily comprises a first resistor R13 and a light emitting diode LED1. The first end of the first resistor R13 is electrically connected with the LED interface of the MCU module 100, the second end of the first resistor R13 is electrically connected with the light emitting diode LED1, and the cathode of the light emitting diode LED1 is grounded. During operation, the MCU module 100 sends an alarm signal or a state indication to the external interface according to the collected data. When operating normally, the LED lamp will light up. If an abnormal situation such as exceeding the predetermined acceleration range occurs, the LED lamp will flicker as a fault indication.

[0039] The working principle of the circuit of the embodiment is as follows:

[0040] The core control principle of the circuit is to collect and process the signals of the acceleration sensor module 200 through the MCU module 100, realizing the design of the three-axis acceleration sensor. The acceleration sensor module 200 is responsible for real-time detection of the acceleration of the object in the X-axis, Y-axis, and Z-axis directions. The MCU module 100 communicates with the acceleration sensor module 200 through the SPI bus and uses the interrupt mechanism to obtain data in time. The MCU module 100 filters and calculates the collected data and transmits the calculation results to external devices through the UART interface. The MCU module 100 controls the sampling frequency of the acceleration sensor module 200 through its internal timer unit and adjusts the communication rate as needed to ensure a balance between power consumption and performance. The linear voltage stabilizing module 400 provides stable power supply, enabling the MCU module 100 and the acceleration sensor module 200 to work in a low-noise environment, further improving the accuracy of the data.

[0041] The embodiment also discloses a three-axis accelerometer comprising the three-axis acceleration sensor circuit. The three-axis accelerometer is an inclination measuring device based on the three-axis acceleration sensor, which is beneficial to reduce noise and interference in the signal transmission process, thereby ensuring the integrity of the signal and enabling high-density installation in a space-limited environment without sacrificing performance.

[0042] The embodiment has the following beneficial effects:

[0043] Improve stability and anti-interference ability: through the improved power management design, reduce the influence of power noise, improve the accuracy of signal acquisition, ensure stable operation in complex environment. Adopt multi-stage LDO voltage regulator design and high-efficiency power filter technology, effectively reduce the interference of power noise, ensure to provide stable and clean voltage, thereby improve the collection accuracy of accelerometer data and the overall stability of the system.

[0044] Optimize signal processing capability: through the enhanced signal filtering mechanism, effectively suppress external noise, improve the accuracy of sensor data, especially in high dynamic and strong vibration environment, still can reliably work. Through the enhancement of signal filtering design and anti-interference circuit, the influence of external noise on signal is effectively reduced, the accuracy of signal is improved, and the system can reliably collect data in complex working environment.

[0045] Improve integration and reliability: adopt higher integration circuit design, reduce the number of independent modules in the system, reduce volume and power consumption, at the same time improve the overall reliability and maintainability of the system. Through the optimization of circuit layout, the integration of the system is improved, the modular design is reduced, the power consumption is reduced and the volume is reduced. The high integration design makes the installation and maintenance of the system more convenient, reduces the failure rate, and reduces the production and development cost.

[0046] Enhanced environmental adaptability: capable of adapting to extreme environmental conditions such as high temperature, high humidity, strong electromagnetic interference, etc., to ensure that the accelerometer can also work normally under these environments. The design especially considers the application requirements of the device in harsh environments, adopts anti-vibration and anti-interference design, and ensures that the system can still work stably under extreme environments such as high temperature and strong vibration.

[0047] Optimize interface compatibility: adopt standardized SPI interface and other commonly used communication interfaces (such as UART interface, SWD interface), enhance the compatibility with external devices, and ensure efficient communication and interoperability between different devices.

[0048] The embodiments of the utility model are described in detail above combined with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by those skilled in the art without departing from the purpose of the utility model.

Claims

1. A three-axis acceleration sensor circuit, characterized by comprising: The application relates to a three-axis acceleration sensor circuit. The MCU module has a first power supply end, a first input end and a first output end. The acceleration sensor module has a second power supply end and a second output end, and the second output end of the acceleration sensor module is connected with the first input end of the MCU module. The linear voltage stabilizing module has a third output end, and the third output end of the linear voltage stabilizing module is connected with the first power supply end of the MCU module and the second power supply end of the acceleration sensor module respectively.

2. The three-axis acceleration sensor circuit according to claim 1, characterized by The MCU module has a plurality of SPI bus pins serving as the first input end, and the SPI bus pins are connected with the second output end of the acceleration sensor module.

3. The triaxial acceleration sensor circuit according to claim 1, characterized in that, The MCU module has a plurality of IO interfaces, and the IO interfaces are used for controlling the threshold setting of each axis of the acceleration sensor module.

4. The three-axis acceleration sensor circuit according to claim 1, 2 or 3, characterized in that, The MCU module adopts an integrated circuit with a model number of N32L403KBQ7.

5. The triaxial acceleration sensor circuit according to claim 1, 2 or 3, characterized in that, The third power supply end of the acceleration sensor module is connected with a first filter network, and the first filter network comprises a plurality of filter capacitors.

6. The triaxial acceleration sensor circuit according to claim 1, characterized in that The output end of the linear voltage stabilizing module is connected with a second filter network, and the second filter network comprises a plurality of parallelly connected filter capacitors.

7. The triaxial acceleration sensor circuit according to claim 1 or 6, characterized in that The linear voltage stabilizing module comprises a voltage stabilizing chip, a first filter capacitor, a second filter capacitor and a third filter capacitor.

8. The three-axis acceleration sensor circuit according to claim 7, characterized by The first filter capacitor is connected at the input end of the voltage stabilizing chip, and the second filter capacitor and the third filter capacitor are parallelly connected at the output end of the voltage stabilizing chip.

9. The triaxial acceleration sensor circuit of claim 1, wherein, The voltage stabilizing chip adopts an integrated circuit with a model number of TPNCP500SN33T1G.

10. A triaxial accelerometer characterized by The three-axis acceleration sensor circuit further comprises an LED indicating lamp module, the LED indicating lamp module has a second input end, the second input end of the LED indicating lamp module is connected with an LED interface of the MCU module, the LED indicating lamp module comprises a first resistor and a light emitting diode, a first end of the first resistor is electrically connected with the LED interface, a second end of the first resistor is electrically connected with the light emitting diode, and a cathode of the light emitting diode is grounded. The application further relates to a three-axis acceleration sensor circuit comprising any one of the three-axis acceleration sensor circuits as claimed in claims 1 to 9.

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