Novel battery type low-power-consumption absolute value motor encoder

Abstract

The utility model discloses a novel battery type low-power-consumption absolute value motor encoder, which comprises an MCU (Microprogrammed Control Unit) welded on an encoder plate, a power supply and communication interface circuit, a Hall signal sensor circuit and a low-power-consumption magnetic sensor circuit. Whether the main control board outputs 5V direct current or not is detected through the voltage sampling circuit, when it is detected that the main control board does not output 5V direct current, the lithium battery CHARGE supplies power to the low-power-consumption magnetic sensing chip U3 and the MCU, the low-power-consumption magnetic sensing chip U3 is awakened from a sleep mode, and the MCU is awakened from a sleep mode. The MCU collects and stores the rotation information of the motor through the low-power-consumption magnetic sensing chip U3, and sends the stored rotation information of the motor to the main control board through the RS485 conversion chip U1 after detecting that the main control board returns to normal, so that when the main control board cannot provide voltage normally, the MCU sends the rotation information of the motor to the main control board through the RS485 conversion chip U1. The absolute value motor encoder can also read the rotation information of the motor normally.

Description

Technical Field

[0001] The utility model relates to the technical field of motor encoders, in particular to a novel battery-type low-power consumption absolute value motor encoder. Background Art

[0002] The absolute encoder can record the absolute position of the motor, that is, it can directly read the current rotation position of the motor after power-on without returning to the origin. The absolute encoder is widely used in motors. When the main control board cannot provide voltage normally, the absolute encoder on the traditional motor cannot read the rotation information of the motor. Therefore, we propose a new battery-powered low-power absolute motor encoder. Utility Model Content

[0003] The utility model aims to provide a novel battery-type low-power absolute value motor encoder to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a new type of battery-type low-power absolute value motor encoder, comprising an MCU welded on an encoder board, a power supply and communication interface circuit, a Hall signal sensor circuit and a low-power magnetic sensor circuit, wherein the encoder board provides a 5V DC voltage to the MCU, the power supply and communication interface circuit, the Hall signal sensor circuit and the low-power magnetic sensor circuit, and the MCU is electrically connected to the power supply and communication interface circuit, the Hall signal sensor circuit and the low-power magnetic sensor circuit at the same time;

[0005] The power supply and communication interface circuit includes a network port RJ1 electrically connected to the absolute value motor encoder, a lithium battery CHARGE and an RS485 conversion chip U1. The network port RJ1 is connected to the main control board in the form of RS485 communication. The absolute value motor encoder transmits the real-time position data information of the motor to the main control board through the network port RJ1, thereby realizing the vector control of the motor. Pin A6 and pin A5 of the network port RJ1 are both grounded. Pin A2 of the network port RJ1 is electrically connected to pin A1 of the network port RJ1, and is electrically connected to one end of a fuse F1 and one end of a TVS tube D1. The other end of the fuse F1 is electrically connected to one end of a capacitor C3 and one end of a capacitor C1. The other end of the fuse F1 is electrically connected to a 5V DC voltage. The other end of the capacitor C3, the other end of the capacitor C1 and the TVS tube D1 are electrically connected. The other end of the VS tube D1 is grounded, the 5V DC voltage is also electrically connected to one end of the resistor R1, one end of the resistor R2 and the positive electrode of the reverse diode D3, the other end of the resistor R1 is electrically connected to the positive electrode of the LED indicator D2, the negative electrode of the LED indicator D2 is grounded, the other end of the resistor R2 is electrically connected to one end of the resistor R15 and one end of the resistor R13, the other end of the resistor R15 is electrically connected to the sampling pin of the MCU and one end of the capacitor C10, the other end of the capacitor C10 and the other end of the resistor R13 are both grounded, the negative electrode of the reverse diode D3 is electrically connected to the high level VCC, one end of the capacitor C2 and the negative electrode of the Schottky diode D4, the positive electrode of the Schottky diode D4 is electrically connected to the pin 2 of the lithium battery CHARGE, the pin 1 of the lithium battery CHARGE and the other end of the capacitor C2 are both grounded;

[0006] Pin 2 and pin 3 of the RS485 conversion chip U1 are electrically connected to the same resistor R18, and the resistor R18 is electrically connected to a 5V DC voltage. Pin 4 of the RS485 conversion chip U1 is electrically connected to one end of a resistor R22, and the other end of the resistor R22 is electrically connected to the MCU. Pin 5 of the RS485 conversion chip U1 is grounded. Pin 6 of the RS485 conversion chip U1 is electrically connected to one end of a resistor R23, one end of a resistor R3, and one end of a resistor R20, and the other end of the resistor R20 is electrically connected to the main control board interface. Pin 2 of D5 and the ground end of the main control board interface D5 are grounded, pin 1 of the main control board interface D5 is electrically connected to one end of a resistor R19, the other end of the resistor R19 is electrically connected to pin 7 of the RS485 conversion chip U1 and the other end of the resistor R3, the other end of the resistor R19 is also electrically connected to one end of a resistor R21, the other end of the resistor R21 is grounded, the other end of the resistor R23 is electrically connected to a 5V DC voltage and pin 8 of the RS485 conversion chip U1, and is electrically connected to one end of a capacitor C7, and the other end of the capacitor C7 is grounded.

[0007] Preferably, the Hall signal sensor circuit includes a Hall signal magnetic sensor chip U4 and an optical coupler U22. The Hall signal magnetic sensor chip U4 is installed on the circuit board at a central position close to the motor shaft, so that the Hall signal magnetic sensor chip U4 can correctly sense the magnetic field change information when the motor shaft rotates. Pin 1 of the Hall signal magnetic sensor chip U4 is electrically connected to pin 3 of the field effect tube Q1 and one end of the capacitor C5. The other end of the capacitor C5 and pin 4 of the Hall signal magnetic sensor chip U4 are both grounded. Pin 1 of the field effect tube Q1 is electrically connected to pin 4 of the optical coupler U22 and resistor R4. One end of the optocoupler U22, the other end of the resistor R4 and the pin 2 of the field effect transistor Q1 are electrically connected to the DC voltage of 5V, the pin 3 of the optocoupler U22 is grounded, the pin 1 of the optocoupler U22 is electrically connected to the high level VCC, the pin 2 of the optocoupler U22 is electrically connected to one end of the resistor R5, the other end of the resistor R5 is electrically connected to the control pin of the MCU, the pin 2 of the Hall signal magnetic sensor chip U4 is electrically connected to one end of the resistor R16, the other end of the resistor R16 is grounded, and the pins 6, 7 and 8 of the Hall signal magnetic sensor chip U4 are electrically connected to the input end of the MCU.

[0008] Preferably, the low-power magnetic sensor circuit includes a low-power magnetic sensor chip U3, a pin 1 of the low-power magnetic sensor chip U3 is electrically connected to the MCU and is used to send an interrupt signal INT to the MCU, a pin 2 of the low-power magnetic sensor chip U3 communicates with the MCU via a CS signal line for SPI communication, a pin 3 of the low-power magnetic sensor chip U3 communicates with the MCU via a CLK signal line for SPI communication, a pin 5 of the low-power magnetic sensor chip U3 communicates with the MCU via a MOSI signal line for SPI communication, and a pin 6 of the low-power magnetic sensor chip U3 communicates with the MCU via a MISO signal line. The number line communicates with the MCU through SPI, pin 7 of the low-power magnetic sensor chip U3 is electrically connected to one end of the resistor R6, and the other end of the resistor R6 is grounded, pin 8 of the low-power magnetic sensor chip U3 is electrically connected to the high level VCC and one end of the capacitor C8, the other end of the capacitor C8, pin 11 of the low-power magnetic sensor chip U3 and pin 12 of the low-power magnetic sensor chip U3 are all grounded, pin 15 of the low-power magnetic sensor chip U3 is electrically connected to the high level VCC and one end of the capacitor C6, and the other end of the capacitor C6 and pin 13 of the low-power magnetic sensor chip U3 are all grounded.

[0009] Preferably, the low-power magnetic sensor chip U3 is mounted on the circuit board at a central position close to the motor shaft, so that the low-power magnetic sensor chip U3 can quickly sense the motor position change information in the low-power mode.

[0010] Preferably, the fuse F1 and the TVS tube D1 form a protection circuit, which can effectively prevent the absolute value motor encoder from being damaged by lightning surge and static electricity.

[0011] Preferably, the resistor R1 and the LED indicator light D2 form a power indicator light circuit, and the LED indicator light D2 lights up when the main control board normally provides 5V DC power.

[0012] Preferably, the resistor R2, the resistor R13, the resistor R15 and the capacitor C10 form a voltage sampling circuit, and the voltage sampling circuit detects in real time whether the main control board has a 5V DC output.

[0013] Compared with the prior art, the utility model detects whether the main control board has a 5V DC output through a voltage sampling circuit. When it is detected that the main control board has no 5V DC output, the lithium battery CHARGE will power the low-power magnetic sensor chip U3 and the MCU. The low-power magnetic sensor chip U3 is awakened from sleep mode, so that the MCU collects and stores the rotation information of the motor through the low-power magnetic sensor chip U3. When it is detected that the main control board has returned to normal, the MCU sends the stored rotation information of the motor to the main control board through the RS485 conversion chip U1. It can be seen from the above that when the main control board cannot provide voltage normally, the absolute value motor encoder can also read the rotation information of the motor normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a connection block diagram of the utility model;

[0015] Figure 2 for Figure 1 Circuit diagram of power supply and communication interface circuit;

[0016] Figure 3 for Figure 1 Circuit diagram of the Hall signal sensor circuit;

[0017] Figure 4 for Figure 1 Circuit diagram of a low to medium power magnetic sensor circuit. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] like Figures 1 to 4As shown, a novel battery-type low-power absolute value motor encoder proposed in this embodiment includes an MCU welded on an encoder board, a power supply and communication interface circuit, a Hall signal sensor circuit and a low-power magnetic sensor circuit. The encoder board provides a 5V DC voltage to the MCU, the power supply and communication interface circuit, the Hall signal sensor circuit and the low-power magnetic sensor circuit. The MCU is electrically connected to the power supply and communication interface circuit, the Hall signal sensor circuit and the low-power magnetic sensor circuit at the same time.

[0020] The power supply and communication interface circuit includes a network port RJ1 electrically connected to the absolute value motor encoder, a lithium battery CHARGE and an RS485 conversion chip U1. The network port RJ1 is connected to the main control board in the form of RS485 communication. The absolute value motor encoder transmits the real-time position data information of the motor to the main control board through the network port RJ1, thereby realizing the vector control of the motor. Pin A6 and pin A5 of the network port RJ1 are both grounded. Pin A2 of the network port RJ1 is electrically connected to pin A1 of the network port RJ1, and is electrically connected to one end of a fuse F1 and one end of a TVS tube D1. The other end of the fuse F1 is electrically connected to one end of a capacitor C3 and one end of a capacitor C1. The other end of the fuse F1 is electrically connected to a 5V DC voltage. The other end of the capacitor C3, the other end of the capacitor C1 and the TVS tube D1 are electrically connected. The other end of the VS tube D1 is grounded, the 5V DC voltage is also electrically connected to one end of the resistor R1, one end of the resistor R2 and the positive electrode of the reverse diode D3, the other end of the resistor R1 is electrically connected to the positive electrode of the LED indicator D2, the negative electrode of the LED indicator D2 is grounded, the other end of the resistor R2 is electrically connected to one end of the resistor R15 and one end of the resistor R13, the other end of the resistor R15 is electrically connected to the sampling pin of the MCU and one end of the capacitor C10, the other end of the capacitor C10 and the other end of the resistor R13 are both grounded, the negative electrode of the reverse diode D3 is electrically connected to the high level VCC, one end of the capacitor C2 and the negative electrode of the Schottky diode D4, the positive electrode of the Schottky diode D4 is electrically connected to the pin 2 of the lithium battery CHARGE, the pin 1 of the lithium battery CHARGE and the other end of the capacitor C2 are both grounded;

[0021] Pin 2 and pin 3 of the RS485 conversion chip U1 are electrically connected to the same resistor R18, and the resistor R18 is electrically connected to a 5V DC voltage, pin 4 of the RS485 conversion chip U1 is electrically connected to one end of a resistor R22, and the other end of the resistor R22 is electrically connected to the MCU, pin 5 of the RS485 conversion chip U1 is grounded, pin 6 of the RS485 conversion chip U1 is electrically connected to one end of a resistor R23, one end of a resistor R3 and one end of a resistor R20, the other end of the resistor R20 is electrically connected to pin 2 of the main control board interface D5, the ground end of the main control board interface D5 is grounded, pin 1 of the main control board interface D5 is electrically connected to one end of a resistor R19, the other end of the resistor R19 is electrically connected to pin 7 of the RS485 conversion chip U1 and pin 1 of the resistor R3 The other end is electrically connected, the other end of the resistor R19 is also electrically connected to one end of the resistor R21, the other end of the resistor R21 is grounded, the other end of the resistor R23 is electrically connected to the 5V DC voltage and the pin 8 of the RS485 conversion chip U1, and is electrically connected to one end of the capacitor C7, the other end of the capacitor C7 is grounded, the fuse F1 and the TVS tube D1 form a protection circuit, which can effectively prevent the absolute value motor encoder from being damaged by lightning surge and static electricity, the resistor R1 and the LED indicator D2 form a power indicator circuit, and the LED indicator D2 lights up when the main control board normally provides 5V DC, the resistor R2, the resistor R13, the resistor R15 and the capacitor C10 form a voltage sampling circuit, and the voltage sampling circuit detects whether the main control board has a 5V DC output in real time;

[0022] The Hall signal sensor circuit includes a Hall signal magnetic sensor chip U4 and an optical coupler U22. The Hall signal magnetic sensor chip U4 is installed on the circuit board at a central position close to the motor shaft, so that the Hall signal magnetic sensor chip U4 can correctly sense the magnetic field change information when the motor shaft rotates. Pin 1 of the Hall signal magnetic sensor chip U4 is electrically connected to pin 3 of the field effect tube Q1 and one end of the capacitor C5. The other end of the capacitor C5 and pin 4 of the Hall signal magnetic sensor chip U4 are both grounded. Pin 1 of the field effect tube Q1 is electrically connected to pin 4 of the optical coupler U22 and one end of the resistor R4. , the other end of the resistor R4 and the pin 2 of the field effect tube Q1 are both electrically connected to the DC voltage of 5V, the pin 3 of the optocoupler U22 is grounded, the pin 1 of the optocoupler U22 is electrically connected to the high level VCC, the pin 2 of the optocoupler U22 is electrically connected to one end of the resistor R5, the other end of the resistor R5 is electrically connected to the control pin of the MCU, the pin 2 of the Hall signal magnetic sensor chip U4 is electrically connected to one end of the resistor R16, the other end of the resistor R16 is grounded, and the pins 6, 7 and 8 of the Hall signal magnetic sensor chip U4 are all electrically connected to the input end of the MCU;

[0023] The low-power magnetic sensor circuit includes a low-power magnetic sensor chip U3. Pin 1 of the low-power magnetic sensor chip U3 is electrically connected to the MCU and is used to send an interrupt signal INT to the MCU. The low-power magnetic sensor chip U3 is installed on the circuit board at a central position close to the motor shaft, so that the low-power magnetic sensor chip U3 can quickly sense the motor position change information in the low-power mode. Pin 2 of the low-power magnetic sensor chip U3 communicates with the MCU via the CS signal line for SPI communication, pin 3 of the low-power magnetic sensor chip U3 communicates with the MCU via the CLK signal line for SPI communication, pin 5 of the low-power magnetic sensor chip U3 communicates with the MCU via the MOSI signal line, pin 6 of the low-power magnetic sensor chip U3 communicates with the MCU via the MISO signal line, pin 7 of the low-power magnetic sensor chip U3 is electrically connected to one end of a resistor R6, the other end of the resistor R6 is grounded, and pin 8 of the low-power magnetic sensor chip U3 is electrically connected to a high level VCC and one end of a capacitor C8. The other end of capacitor C8, pin 11 of low-power magnetic sensor chip U3 and pin 12 of low-power magnetic sensor chip U3 are all grounded, pin 15 of low-power magnetic sensor chip U3 is electrically connected to high level VCC and one end of capacitor C6, the other end of capacitor C6 and pin 13 of low-power magnetic sensor chip U3 are all grounded, the utility model detects whether the main control board has 5V DC output through a voltage sampling circuit, when it is detected that the main control board has no 5V DC output, the lithium battery CHARGE will power the low-power magnetic sensor chip U3 and MCU, the low-power magnetic sensor chip U3 is awakened from sleep mode, so that the MCU collects and stores the rotation information of the motor through the low-power magnetic sensor chip U3, when it is detected that the main control board returns to normal, the MCU sends the stored rotation information of the motor to the main control board through the RS485 conversion chip U1, it can be seen from the above that when the main control board cannot provide voltage normally, the absolute value motor encoder can also read the rotation information of the motor normally.

[0024] The method of using this embodiment is as follows: a voltage sampling circuit composed of a resistor R2, a resistor R13, a resistor R15 and a capacitor C10 is used to detect whether the main control board has a 5V DC output. When the voltage sampling circuit detects that the main control board has no 5V DC output, the control signal EN_PWR level of the MCU will be pulled high. At this time, the Hall signal magnetic sensor chip U4 will stop working. The lithium battery CHARGE generates a high level VCC through the Schottky diode D4 to power the MCU and the low-power magnetic sensor chip U3. At the same time, the current of the lithium battery CHARGE cannot pass through the reverse diode D3, which can reduce the power consumption in the power-off state and extend the service life of the lithium battery CHARGE. The low-power magnetic sensor chip U3 is awakened from the sleep mode, and the low-power magnetic sensor chip U3 communicates with the MCU through the CS signal line, the CLK signal line, the MOSI signal line and the MISO signal line through SPI. The low-power magnetic sensor chip U3 generates an interrupt The signal INT is given to the MCU, so that the MCU collects and stores the rotation information of the motor through the low-power magnetic sensor chip U3. When the voltage sampling circuit detects that the main control board has resumed normal power supply, the MCU sends the stored rotation information of the motor to the main control board through the RS485 conversion chip U1. The control signal EN_PWR of the MCU controls the conduction of the optical coupler U22 through the resistor R5, so that the 5V DC power can be supplied to the Hall signal magnetic sensor chip U4 through the field effect tube Q1. When the motor rotates, the Hall signal magnetic sensor chip U4 will generate Hall signal W, Hall signal V, and Hall signal U and output them to the MCU. The MCU analyzes the Hall signal W, Hall signal V, and Hall signal U and converts them into the absolute value information of the motor position. The MCU outputs the data to the main control board through the RS485 conversion chip U1. It can be seen from the above that when the main control board cannot provide voltage normally, the absolute value motor encoder can also read the rotation information of the motor normally.

[0025] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A new type of battery-powered low-power absolute value motor encoder, including an MCU welded on an encoder board, a power supply and communication interface circuit, a Hall signal sensor circuit and a low-power magnetic sensor circuit, characterized in that: The encoder board provides a 5V DC voltage to the MCU, the power supply and communication interface circuit, the Hall signal sensor circuit and the low-power magnetic sensor circuit, and the MCU is electrically connected to the power supply and communication interface circuit, the Hall signal sensor circuit and the low-power magnetic sensor circuit at the same time; The power supply and communication interface circuit includes a network port RJ1 electrically connected to the absolute value motor encoder, a lithium battery CHARGE and an RS485 conversion chip U1. The network port RJ1 is connected to the main control board in the form of RS485 communication. Pin A6 and pin A5 of the network port RJ1 are both grounded. Pin A2 of the network port RJ1 is electrically connected to pin A1 of the network port RJ1, and is electrically connected to one end of a fuse F1 and one end of a TVS tube D1. The other end of the fuse F1 is electrically connected to one end of a capacitor C3 and one end of a capacitor C1. The other end of the fuse F1 is electrically connected to a 5V DC voltage. The other end of the capacitor C3, the other end of the capacitor C1 and the other end of the TVS tube D1 are all grounded. The 5V DC voltage also electrically connects the two ends of the fuse F1 to the ground. The first embodiment of the present invention is electrically connected to one end of a resistor R1, one end of a resistor R2 and the positive electrode of a reverse diode D3, the other end of the resistor R1 is electrically connected to the positive electrode of an LED indicator D2, the negative electrode of the LED indicator D2 is grounded, the other end of the resistor R2 is electrically connected to one end of a resistor R15 and one end of a resistor R13, the other end of the resistor R15 is electrically connected to a sampling pin of an MCU and one end of a capacitor C10, the other end of the capacitor C10 and the other end of the resistor R13 are both grounded, the negative electrode of the reverse diode D3 is electrically connected to a high level VCC, one end of the capacitor C2 and the negative electrode of a Schottky diode D4, the positive electrode of the Schottky diode D4 is electrically connected to pin 2 of a lithium battery CHARGE, and pin 1 of the lithium battery CHARGE and the other end of the capacitor C2 are both grounded; Pin 2 and pin 3 of the RS485 conversion chip U1 are electrically connected to the same resistor R18, and the resistor R18 is electrically connected to a 5V DC voltage. Pin 4 of the RS485 conversion chip U1 is electrically connected to one end of a resistor R22, and the other end of the resistor R22 is electrically connected to the MCU. Pin 5 of the RS485 conversion chip U1 is grounded. Pin 6 of the RS485 conversion chip U1 is electrically connected to one end of a resistor R23, one end of a resistor R3, and one end of a resistor R20, and the other end of the resistor R20 is electrically connected to the main control board interface. Pin 2 of D5 and the ground end of the main control board interface D5 are grounded, pin 1 of the main control board interface D5 is electrically connected to one end of a resistor R19, the other end of the resistor R19 is electrically connected to pin 7 of the RS485 conversion chip U1 and the other end of the resistor R3, the other end of the resistor R19 is also electrically connected to one end of a resistor R21, the other end of the resistor R21 is grounded, the other end of the resistor R23 is electrically connected to a 5V DC voltage and pin 8 of the RS485 conversion chip U1, and is electrically connected to one end of a capacitor C7, and the other end of the capacitor C7 is grounded.

2. A novel battery-operated low-power absolute value motor encoder according to claim 1, characterized in that: The Hall signal sensor circuit includes a Hall signal magnetic sensor chip U4 and an optical coupler U22. The Hall signal magnetic sensor chip U4 is installed on the circuit board at a central position close to the motor shaft. Pin 1 of the Hall signal magnetic sensor chip U4 is electrically connected to pin 3 of the field effect tube Q1 and one end of the capacitor C5. The other end of the capacitor C5 and pin 4 of the Hall signal magnetic sensor chip U4 are both grounded. Pin 1 of the field effect tube Q1 is electrically connected to pin 4 of the optical coupler U22 and one end of the resistor R4. The other end of the resistor R4 and the field effect tube Q1 are electrically connected to pin 4 of the optical coupler U22 and one end of the resistor R4. Pin 2 of optocoupler U21 is electrically connected to a DC voltage of 5V, pin 3 of optocoupler U22 is grounded, pin 1 of optocoupler U22 is electrically connected to a high level VCC, pin 2 of optocoupler U22 is electrically connected to one end of resistor R5, and the other end of resistor R5 is electrically connected to a control pin of the MCU, pin 2 of the Hall signal magnetic sensor chip U4 is electrically connected to one end of resistor R16, and the other end of resistor R16 is grounded, and pin 6, pin 7 and pin 8 of the Hall signal magnetic sensor chip U4 are electrically connected to the input end of the MCU.

3. A novel battery-operated low-power absolute value motor encoder according to claim 1, characterized in that: The low-power magnetic sensor circuit includes a low-power magnetic sensor chip U3, wherein pin 1 of the low-power magnetic sensor chip U3 is electrically connected to the MCU and is used to send an interrupt signal INT to the MCU, pin 2 of the low-power magnetic sensor chip U3 communicates with the MCU via a CS signal line for SPI communication, pin 3 of the low-power magnetic sensor chip U3 communicates with the MCU via a CLK signal line for SPI communication, pin 5 of the low-power magnetic sensor chip U3 communicates with the MCU via a MOSI signal line, and pin 6 of the low-power magnetic sensor chip U3 communicates with the MCU via a MISO signal line. SPI communication is performed with the MCU, pin 7 of the low-power magnetic sensor chip U3 is electrically connected to one end of the resistor R6, the other end of the resistor R6 is grounded, pin 8 of the low-power magnetic sensor chip U3 is electrically connected to the high level VCC and one end of the capacitor C8, the other end of the capacitor C8, pin 11 of the low-power magnetic sensor chip U3 and pin 12 of the low-power magnetic sensor chip U3 are all grounded, pin 15 of the low-power magnetic sensor chip U3 is electrically connected to the high level VCC and one end of the capacitor C6, the other end of the capacitor C6 and pin 13 of the low-power magnetic sensor chip U3 are all grounded.

4. A novel battery-operated low-power absolute value motor encoder according to claim 3, characterized in that: The low-power magnetic sensor chip U3 is mounted on the circuit board at a central position close to the motor shaft.

5. A novel battery-operated low-power absolute value motor encoder according to claim 1, characterized in that: The fuse F1 and the TVS tube D1 form a protection circuit.

6. A novel battery-operated low-power absolute value motor encoder according to claim 1, characterized in that: The resistor R1 and the LED indicator light D2 form a power indicator light circuit, and the LED indicator light D2 lights up when the main control board normally provides 5V DC power.

7. A novel battery-operated low-power absolute value motor encoder according to claim 1, characterized in that: The resistor R2, the resistor R13, the resistor R15 and the capacitor C10 form a voltage sampling circuit.

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