Rubidium clock and RTC mixed low-power consumption time keeping device and method

Abstract

The invention provides a rubidium clock RTC mixed low-power consumption time keeping device and method, and relates to the technical field of time synchronization, and the device comprises a core time management module, a processor and control module, a communication and interface module, and a power management and supply module. The core time management module comprises a real-time clock and a rubidium atomic clock; the processor and control module comprises a processor and related control logic; the real-time clock and the processor are in I2C communication connection, the real-time clock outputs an alarm clock pulse to wake up the processor according to a configured wake-up period, and the real-time clock outputs a 1pps signal to a CLK time counting pin of the processor; the rubidium atomic clock is communicated with the processor through a serial port, and the rubidium atomic clock outputs a 10MHz signal to a clock input pin of the processor to serve as a working clock of the processor. The method has the beneficial effects that the power consumption is reduced as much as possible on the premise of ensuring the time keeping precision, and the requirement of battery time keeping is met.

Description

Technical Field

[0001] The present invention relates to the technical field of time synchronization, and in particular to a rubidium clock RTC hybrid low-power consumption timekeeping device and method. Background Art

[0002] Beidou encrypted frequencies and encrypted communications mostly use time-based codes and frequency-changing keys. The slave device often needs to meet a certain time accuracy to normally capture the encrypted signal for analysis.

[0003] Recently, Beidou III has been widely used, and Beidou encrypted frequencies are required in some special fields. In order for the receiver to directly capture the encrypted signal, the receiver needs to have a time synchronization accuracy of 1s to meet the Beidou encryption code capture requirements, or a time synchronization accuracy of 1min to meet the Beidou perforation code capture requirements. Some equipment such as drones and missiles lack time injection methods, and most of them need to use batteries as the main power supply to maintain the Beidou direct capture time requirements. Therefore, a battery punctuality requirement of 1min for N years is proposed in some scenarios. Summary of the invention

[0004] The purpose of the present invention is to provide a low-power timekeeping device and method for hybrid rubidium clock RTC to improve the above problems. In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] In a first aspect, the present application provides a rubidium clock RTC hybrid low-power timekeeping device, including a core time management module, a processor and control module, a communication and interface module, and a power management and supply module;

[0006] The core time management module includes a real-time clock and a rubidium atomic clock, which are used to provide accurate time signals and timekeeping functions;

[0007] The processor and control module includes a processor and related control logic, which are used for module control, power management and time calibration, wherein the processor is used to implement power management of the entire module and implement switching between the real-time clock timekeeping mode and the time calibration mode; when the module is in the real-time clock timekeeping mode, the processor enters the standby low-power mode; when entering the time calibration mode, the real-time clock wakes up the processor, enters the normal working mode, controls the rubidium atomic clock to power on, and performs time deviation measurement and calibration;

[0008] Among them, the real-time clock and the processor are connected by I2C communication. The real-time clock outputs an alarm pulse to wake up the processor with the configured wake-up cycle, and the real-time clock outputs a 1pps signal to the processor's CLK time counting pin;

[0009] Among them, serial communication is adopted between the rubidium atomic clock and the processor. The rubidium atomic clock outputs a LOCK indication signal to the processor to prompt the working status of the rubidium atomic clock. The rubidium atomic clock outputs a 10MHz signal to the processor clock input pin as the working clock of the processor.

[0010] Preferably, the communication and interface module includes an external interface and a level converter, which is responsible for communication and signal adaptation with other devices or modules;

[0011] The docking interface and the processor are connected by serial communication, and a reset signal is set between the docking interface and the processor to reset the device or restore it to an initial state;

[0012] A communication connection is established between the level converter and the processor, the output end of the processor is connected to the input end of the level converter, and the level converter is used to transmit signals between circuits with different voltage levels; the processor internally sends a reset command and a first command to monitor the reset state, and after the external interface receives the first command, it executes the reset operation corresponding to the first command; the processor uses control logic to manage communication with the level converter, including sending data, receiving data and processing the state of the level converter.

[0013] Preferably, the power management and supply module includes a power management module and a linear power chip, which are responsible for the conversion, distribution and management of power; wherein the power management module is a battery, and the output end of the battery includes a first port and a second port, wherein the first port is connected to the input end of the level converter, and the second port is connected to the linear power chip;

[0014] The power input of the power management module is used to power the entire time keeping device after level conversion. In the long-term timekeeping working state, the power management module controls the power supply to the rubidium atomic clock and the interface circuit to be turned off, the processor enters the low power consumption mode, and the real-time clock outputs an alarm to periodically wake up the processor to calibrate the time deviation;

[0015] The linear power chip is used to convert the input voltage into a required output voltage and provide a stable current.

[0016] In a second aspect, the present application also provides a rubidium clock RTC hybrid low-power timekeeping method, comprising:

[0017] Step 1: During the entire working process, the real-time clock is continuously powered on and ensures normal operation;

[0018] Step 2: Using the alarm function of the real-time clock, wake up the rubidium clock according to a predetermined period and perform time calibration;

[0019] Step 3: After waking up the rubidium clock, perform frequency comparison, calculate the timing error of the real-time clock, and multiply the error by the wake-up period to obtain the total time error;

[0020] Step 4: Accumulate the timing error obtained from each wake-up. When the user device needs time, the time maintained by the real-time clock is subtracted from the accumulated timing error to output the real time to the user device.

[0021] The beneficial effects of the present invention are:

[0022] The present invention reduces power consumption as much as possible while ensuring timekeeping accuracy, meeting the need for battery timekeeping (RTC: real-time clock, a timing chip).

[0023] The fusion mode adopted by the present invention is to fuse RTC and rubidium clock, and has a long-term power consumption of 10uA. The rubidium clock works for 4 minutes every 20 days to complete the timing error measurement of RTC. When the timekeeping accuracy of 1 minute in N years is finally met, the power consumption is only 0.31mW (a whole 20-day cycle), and the overall power consumption in one year is 2.715Wh. The volume required for the battery is only 2‰ of that of directly using the rubidium clock. The method can be used with rubidium clocks or constant temperature crystal oscillators with different performances to achieve low-power timekeeping in different scenarios.

[0024] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or be understood by practicing the embodiments of the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a schematic flow chart of a calibration method of a coherent frequency micro-hop device for positioning described in an embodiment of the present invention;

[0027] Figure 2 Schematic diagram of the principle of a coherent frequency micro-hopping device for positioning described in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0030] The traditional direct use of RTC has low timekeeping accuracy and low power consumption (10uA). Since the built-in crystal oscillator has an accuracy of about 5ppm, the timekeeping error in one day reaches 0.432 seconds. After about 139 days, the accuracy exceeds 1 minute, which cannot meet the requirements; while the direct use of rubidium clock has high timekeeping accuracy, but high power consumption requirements (the lowest power consumption among existing atomic clocks is the chip atomic clock, which consumes about 200mW), and the overall power consumption in one year reaches 1.7kWh. Therefore, the method of the present invention can be used with rubidium clocks or constant temperature crystal oscillators of different performances to achieve low-power timekeeping in different scenarios.

[0031] Embodiment 1:

[0032] like Figure 2 As shown, this embodiment provides a low-power timekeeping device hybrid with a rubidium clock and RTC, the device comprising a core time management module, a processor and control module, a communication and interface module, and a power management and supply module;

[0033] The core time management module includes a real-time clock and a rubidium atomic clock, which are used to provide accurate time signals and timekeeping functions;

[0034] The processor and control module includes a processor and related control logic, which are used for module control, power management and time calibration, wherein the processor is used to implement power management of the entire module and implement switching between the real-time clock timekeeping mode and the time calibration mode; when the module is in the real-time clock timekeeping mode, the processor enters the standby low-power mode; when entering the time calibration mode, the real-time clock wakes up the processor, enters the normal working mode, controls the rubidium atomic clock to power on, and performs time deviation measurement and calibration;

[0035] It should be noted that the core time management module jointly provides accurate time signals and timekeeping functions. RTC, with its low power consumption characteristics, is responsible for daily time counting and maintenance, while the rubidium atomic clock, with its high precision characteristics, is used to periodically calibrate the RTC to ensure the long-term stability and accuracy of time. By combining the low power consumption of RTC and the high precision of rubidium atomic clock, this module can provide reliable time services while maintaining low energy consumption. The processor and control module are responsible for the control, power management and time calibration of the entire device. The processor switches to different working modes according to the working status of the module to realize intelligent power management. This module can significantly reduce overall energy consumption while ensuring uninterrupted time services.

[0036] Among them, the real-time clock and the processor are connected by I2C communication. The real-time clock outputs an alarm pulse to wake up the processor with the configured wake-up cycle, and the real-time clock outputs a 1pps signal to the processor's CLK time counting pin;

[0037] Among them, serial communication is adopted between the rubidium atomic clock and the processor. The rubidium atomic clock outputs a LOCK indication signal to the processor to prompt the working status of the rubidium atomic clock. The rubidium atomic clock outputs a 10MHz signal to the processor clock input pin as the working clock of the processor.

[0038] It should be noted that the rubidium atomic clock outputs a LOCK indication signal and a 10MHz signal through serial communication, which are used to indicate the working status and provide a high-precision clock source respectively; and the implementation of serial communication ensures that the processor can accurately obtain the working status of the rubidium atomic clock and use the 10MHz signal it provides for high-precision time calibration.

[0039] Specifically, the communication and interface module includes an external interface and a level converter, which is responsible for communication and signal adaptation with other devices or modules.

[0040] It should be noted that the communication and interface module is responsible for communication and signal adaptation with other devices or modules to ensure that devices with different voltage levels can exchange data smoothly. The use of level converters eliminates compatibility issues caused by voltage differences between different devices and improves the versatility and reliability of the system.

[0041] The docking interface and the processor are connected by serial communication, and a reset signal is set between the docking interface and the processor to reset the device or restore it to an initial state;

[0042] A communication connection is established between the level converter and the processor, the output end of the processor is connected to the input end of the level converter, and the level converter is used to transmit signals between circuits with different voltage levels.

[0043] Specifically, the processor internally sends a reset command and a first command to monitor the reset state, and after receiving the first command through the external interface, executes a reset operation corresponding to the first command.

[0044] Specifically, the processor manages communications with the level converter using control logic, including sending data, receiving data, and processing the status of the level converter.

[0045] Specifically, the power management and supply module includes a power management module and a linear power chip, which are responsible for the conversion, distribution and management of power; wherein the power management module is a battery, and the output end of the battery includes a first port and a second port, wherein the first port is connected to the input end of the level converter, and the second port is connected to the linear power chip;

[0046] After the power input of the power management module is level-converted, it is used to power the entire time keeping device. The voltage used to power the entire time keeping device is 3.8V~4.1VDC. In the long-term timekeeping working state, the power management module controls the power supply to the rubidium atomic clock and the interface circuit to be turned off, the processor enters the low power consumption mode, and regularly wakes up the processor through the real-time clock output alarm to calibrate the time deviation; the linear power chip is used to convert the input voltage into the required output voltage and provide a stable current.

[0047] It should be noted that, through level conversion, the power management module ensures that different components can work at a uniform voltage level, improves the compatibility and stability of the system, and in the long-term punctual working state, the power management module will control the shutdown of the rubidium atomic clock and the interface circuit power supply to reduce energy consumption. At the same time, the processor enters a low-power mode to reduce unnecessary energy consumption. This intelligent power control strategy significantly reduces the energy consumption of the system during non-calibration periods and extends the service life of the equipment. It is particularly suitable for application scenarios that require long-term continuous operation. Therefore, in this step, an efficient and reliable power management system is formed by combining level conversion, intelligent power control and stable linear power supply. In detail, by accurately controlling the supply and cut-off of power, fine management of energy consumption is achieved.

[0048] Embodiment 2:

[0049] This embodiment provides a low-power timekeeping method for a rubidium clock and an RTC hybrid, including:

[0050] Step 1: During the entire working process, the real-time clock is continuously powered on and ensures normal operation;

[0051] Step 2: Using the alarm function of the real-time clock, wake up the rubidium clock according to a predetermined period and perform time calibration;

[0052] Step 3: After waking up the rubidium clock, perform frequency comparison, calculate the timing error of the real-time clock, and multiply the error by the wake-up period to obtain the total time error;

[0053] Step 4: Accumulate the timing error obtained from each wake-up. When the user device needs time, the time maintained by the real-time clock is subtracted from the accumulated timing error to output the real time to the user device.

[0054] The frequency comparison process in step 3 is as follows: the real-time clock outputs a 1Hz periodic signal to the clk clock counting pin of the processor, the processor uses the 10MHz signal output by the real-time clock as the clock input, multiplies it to 50MHz through an internal multiplier as the reference clock of the clock counting unit, and performs period measurement on the 1Hz signal of the real-time clock. The frequency difference is obtained by calculating and accumulating the 1Hz signal period measured in each period and dividing it by the total time, and the frequency difference is recorded by a low-power processor, and the timing error of the real-time clock is obtained by multiplying the frequency difference by the wake-up period.

[0055] The frequency difference obtained by the comparison method in step 4 is multiplied by the wake-up interval period to obtain the total time error, and the total time error is accumulated to obtain the accumulated result; when the user device needs to use the time, the time maintained by the real-time clock is subtracted from the accumulated result to obtain the real time and output it to the user device.

[0056] Among them, RTC uses the low power consumption and long-term timekeeping capability of RTC to realize the long-term timekeeping function of the entire module; CPT uses the high accuracy and stability of the CPT atomic clock and its excellent aging characteristics to start working regularly and calibrate the time deviation accumulated by the long-term work of RTC; ARM realizes the power management of the entire module and realizes the switching of two working modes: RTC timekeeping mode and time calibration mode; when the module is in RTC timekeeping mode, ARM enters the standby low power consumption mode to reduce power consumption; when entering the time calibration mode, RTC wakes up ARM, enters the normal working mode, controls CPT to power on, and performs time deviation measurement and calibration; the power supply is designed to provide power for the entire time keeping device after the power input is converted, and the battery power supply voltage is 3.8V~4.1VDC. In order to reduce the power consumption of the entire module, the module controls the power supply to CPT and the interface circuit to be turned off in the long-term timekeeping working state, and the ARM processor enters the low power consumption mode. The RTC alarm wakes up ARM periodically to calibrate the time deviation (first compare the frequencies to obtain Δf, then use Δf to obtain the timing error Δt of each wake-up cycle, and then sum up the Δt of all the above cycles to obtain the total time error ΔT. At this time, the time read by the RTC minus the accumulated timing error ΔT is used to obtain the real time).

[0057] Therefore, the present invention aims to provide an improved time synchronization system, which realizes precise control and low-power operation of RTC and rubidium atomic clock through a novel power management module and intelligent control strategy. The core lies in an innovative hybrid timekeeping method, which combines the low power consumption characteristics of RTC and the high precision characteristics of rubidium atomic clock, performs time calibration by periodically waking up the rubidium atomic clock, and puts the system into a low-power state during non-calibration. In addition, an efficient power management strategy is proposed, which provides a stable power supply for the entire time keeping device through level conversion and linear power supply chip, and intelligently controls the power supply of rubidium atomic clock and interface circuit in the long-term timekeeping working state, further reducing energy consumption, which not only improves the accuracy and reliability of time synchronization, but also significantly reduces the energy consumption of the system, making it more suitable for application scenarios that require long-term continuous operation and high-precision time synchronization, and can also effectively solve the problems existing in the prior art, providing new directions and possibilities for the development of time synchronization technology.

[0058] It should be noted that, in some embodiments, the working stages of the low power consumption timekeeping device can be divided into the following stages:

[0059] 1. Initialization phase: During the initialization phase, the product is powered on normally (RTC is continuously powered on, ARM and CPT atomic clocks are powered on), the reference time is externally injected into the RTC and the CPT is calibrated using the external reference.

[0060] Among them, the external injection of reference time into RTC is: the external standard time, such as the UTC time obtained from Beidou, is injected into RTC, replacing the start time of RTC maintenance

[0061] The external reference completes the calibration of CPT: the external standard time, such as 1pps obtained from Beidou, is compared with the CPT frequency and written into the CPT to correct its frequency

[0062] 2. Timing stage: After initialization, the device enters the timing stage, which is powered by batteries. The timing stage is divided into the RTC timing stage and the wake-up calibration stage. The power consumption of the RTC timing stage is 0.033mW, and the power consumption of the wake-up calibration stage is 1716mW every 20 days for 4 minutes, with a total power consumption of 0.271mW.

[0063] 2.1. RTC timekeeping stage: In this stage, only RTC is powered, and ARM and CPT atomic clocks are both in a power-off state. At this time, the overall power consumption of the device is 0.033mW (10uA, 3.3V); in this stage, the RTC's own ability is fully utilized for timekeeping. The RTC clock accuracy is 3ppm, the annual aging rate is 2ppm / year, the worst accuracy after 4 years is 11ppm, and the error of timekeeping for 20 days is 19.008 seconds.

[0064] 2.2. Wake-up calibration phase (lasts 4 minutes): In this phase, RTC, ARM, and CPT are all powered on, with RTC power consumption of 0.99mW and ARM power consumption of 165mW. The CPT atomic clock preheats at 2W in the first 3 minutes and then remains in a steady state at 200mW in the next minute. The average power consumption in this phase is about 1716mW. The wake-up phase mainly utilizes the high accuracy of the CPT atomic clock, which has an initial accuracy of 1E-10 and an annual aging of 1E-8, i.e., its accuracy is 4.01E-8 at the end of 4 years of timekeeping. ARM uses a 50M clock to complete phase difference measurement and calculates the frequency difference for 1 minute. The frequency measurement error is 20ns / 60s=3.3E-9, so the maximum frequency difference during the working process is 4.34E-8. ARM uses the measured frequency error multiplied by the 20-day timekeeping time to calculate the timing error of the RTC and stores it in FLASH.

[0065] 3. Use phase: The user device issues a command, all devices are powered on, and all the timing errors stored in the FLASH are accumulated and processed with the current RTC time to obtain the accurate time and output it to the user device. Since the RTC timing deviation is corrected by the CPT atomic clock, its theoretical timekeeping accuracy is 4.34E-8 times 4 years, and the timekeeping accuracy is about 5.5 seconds.

[0066] Therefore, the timekeeping device of the present invention uses RTC autonomous timekeeping as the main timekeeping device, that is, the RTC is powered on and works normally during the whole working process; wherein, the rubidium clock is used as a calibration device to determine its power-on wake-up time according to the required accuracy; the alarm function of the RTC is used (for example, the alarm pulse is output after 28 days) to wake up the rubidium clock according to a predetermined period, the rubidium clock completes preheating in 3 minutes, and completes the frequency comparison with the RTC in 1 minute (frequency comparison process: RTC outputs a 1Hz periodic signal to the clk clock counting pin of ARM, ARM uses the 10M output by the CPT rubidium clock as the clock input of the chip, and uses the internal frequency multiplier to multiply the frequency to 50MHz as the reference clock of the clock counting unit to measure the 1Hz period of the RTC, and completes the frequency comparison with the CPT clock by calculating the 1Hz signal period of the RTC, and the calculation formula is as follows:

[0067] Add up the 1Hz signal period measured in each cycle and divide it by the total time to get:

[0068] Δf=(P1+P2+~+P60) / 60

[0069] The low-power processor records the frequency difference and obtains the RTC timing error by multiplying the frequency difference by the wake-up period. After each wake-up, the timing error of the period is calculated (the calculation method is: after wake-up, the Δf obtained by the above-mentioned frequency comparison method is multiplied by the wake-up interval period of 28 days to obtain the total time error, namely: Δt=Δf*t=Δf*(28*86400) and accumulates it (accumulates the timing error obtained by each wake-up). When the user device needs to use time, the time maintained by the RTC at this time is subtracted from the accumulated timing error of the previous period to obtain the real time and output it to the user device.

[0070] In summary, the fusion mode adopted by the present invention, the fusion mode of RTC and rubidium clock, has a long-term power consumption of 10uA, the rubidium clock works for 4 minutes every 20 days to complete the timing error measurement of RTC, and finally meets the timekeeping accuracy of 1 minute in N years, the power consumption is only 0.31mW (a whole 20-day cycle), the overall power consumption in one year is 2.715Wh, and the volume required for the battery is only 2‰ of the direct use of the rubidium clock. This method can be used with rubidium clocks or constant temperature crystal oscillators of different performances to achieve low-power timekeeping in different scenarios. RTC maintains a low-power state in daily operation, and the rubidium atomic clock is only awakened for calibration when needed. This design significantly reduces the overall energy consumption of the system, and can realize on-demand control of the power supply of the rubidium atomic clock and the interface circuit while ensuring the accuracy of time synchronization, which not only reduces energy consumption, but also improves the response speed and flexibility of the power supply system. By further optimizing the power management algorithm, improving the wake-up efficiency of the rubidium atomic clock, or developing more advanced calibration algorithms to reduce time deviation, intelligent power management and periodic calibration ensure that the system can maintain high-precision time synchronization under various environmental conditions.

[0071] It should be noted that, regarding the device in the above embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment of the method, and will not be elaborated here.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0073] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A low-power timekeeping device hybrid with a rubidium clock and RTC, characterized in that: It includes a core time management module, a processor and control module, a communication and interface module, and a power management and supply module; The core time management module includes a real-time clock and a rubidium atomic clock, which are used to provide accurate time signals and timekeeping functions; The processor and control module includes a processor and related control logic, which are used for module control, power management and time calibration, wherein the processor is used to implement power management of the entire module and implement switching between a real-time clock punctuality mode and a time calibration mode; When the module is in the real-time clock timekeeping mode, the processor enters the standby low-power mode; when entering the time calibration mode, the real-time clock wakes up the processor, enters the normal working mode, controls the rubidium atomic clock to power on, and performs time deviation measurement and calibration; Among them, the real-time clock and the processor are connected by I2C communication. The real-time clock outputs an alarm pulse to wake up the processor with the configured wake-up cycle, and the real-time clock outputs a 1pps signal to the processor's CLK time counting pin; Among them, serial communication is adopted between the rubidium atomic clock and the processor. The rubidium atomic clock outputs a LOCK indication signal to the processor to prompt the working status of the rubidium atomic clock. The rubidium atomic clock outputs a 10MHz signal to the processor clock input pin as the working clock of the processor.

2. The low-power consumption timekeeping device of the rubidium clock RTC hybrid according to claim 1, characterized in that: The communication and interface module includes an external interface and a level converter, which is responsible for communication and signal adaptation with other devices or modules; The docking interface and the processor are connected by serial communication, and a reset signal is set between the docking interface and the processor to reset the device or restore it to an initial state; A communication connection is established between the level converter and the processor, the output end of the processor is connected to the input end of the level converter, and the level converter is used to transmit signals between circuits with different voltage levels.

3. The low-power consumption timekeeping device of the rubidium clock RTC hybrid according to claim 2, characterized in that: The processor internally sends a reset command and a first command for monitoring the reset state, and after receiving the first command through the external interface, executes a reset operation corresponding to the first command.

4. The low-power consumption timekeeping device of the rubidium clock RTC hybrid according to claim 2, characterized in that: The processor manages communications with the level shifter using control logic, including sending data, receiving data, and handling the status of the level shifter.

5. The low-power consumption timekeeping device of the rubidium clock RTC hybrid according to claim 2, characterized in that: The power management and supply module includes a power management module and a linear power chip, which are responsible for the conversion, distribution and management of power; wherein the power management module is a battery, and the output end of the battery includes a first port and a second port, wherein the first port is connected to the input end of the level converter, and the second port is connected to the linear power chip; The power input of the power management module is used to power the entire time keeping device after level conversion. In the long-term timekeeping working state, the power management module controls the power supply to the rubidium atomic clock and the interface circuit to be turned off, the processor enters the low power consumption mode, and the real-time clock outputs an alarm to periodically wake up the processor to calibrate the time deviation; The linear power chip is used to convert the input voltage into a required output voltage and provide a stable current.

6. The low-power consumption timekeeping device of the rubidium clock RTC hybrid according to claim 5, characterized in that: The voltage used to power the entire time keeping device is 3.8V-4.1VDC.

7. A low-power timekeeping method of a rubidium clock RTC hybrid, as claimed in any one of claims 1 to 4, characterized in that: include: Step 1: During the entire working process, the real-time clock is continuously powered on and ensures normal operation; Step 2: Using the alarm function of the real-time clock, wake up the rubidium clock according to a predetermined period and perform time calibration; Step 3: After waking up the rubidium clock, perform frequency comparison, calculate the timing error of the real-time clock, and multiply the error by the wake-up period to obtain the total time error; Step 4: Accumulate the timing error obtained from each wake-up. When the user device needs time, the time maintained by the real-time clock is subtracted from the accumulated timing error to output the real time to the user device.

8. The low-power timekeeping method of rubidium clock RTC hybrid according to claim 7, characterized in that: The frequency comparison process in step 3 is as follows: the real-time clock outputs a 1Hz periodic signal to the clk clock counting pin of the processor, the processor uses the 10MHz signal output by the real-time clock as the clock input, multiplies it to 50MHz through an internal multiplier as the reference clock of the clock counting unit, and performs period measurement on the 1Hz signal of the real-time clock. The frequency difference is obtained by calculating and accumulating the 1Hz signal period measured in each period and dividing it by the total time, and the frequency difference is recorded by a low-power processor, and the timing error of the real-time clock is obtained by multiplying the frequency difference by the wake-up period.

9. The low-power consumption timekeeping method of rubidium clock RTC hybrid according to claim 8, characterized in that: The frequency difference obtained by the comparison method in step 4 is multiplied by the wake-up interval period to obtain the total time error, and the total time error is accumulated to obtain the accumulated result; when the user device needs to use the time, the time maintained by the real-time clock is subtracted from the accumulated result to obtain the real time and output it to the user device.

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