WO2022227605A1

WO2022227605A1 - Low-power-consumption hygrothermograph circuit structure and measurement control method therefor

Info

Publication number: WO2022227605A1
Application number: PCT/CN2021/138241
Authority: WO
Inventors: 孙军; 沈天平; 姜黎黎
Original assignee: 华润微集成电路(无锡)有限公司
Priority date: 2021-04-26
Filing date: 2021-12-15
Publication date: 2022-11-03
Also published as: CN115248608B; CN115248608A

Abstract

A low-power-consumption hygrothermograph circuit structure. The circuit structure comprises: a micro-control unit, a register module and a clock module. The micro-control unit is connected to an external software module and is used to configure the register module. The register module is connected to the micro-control unit and is used to measure temperature and humidity by means of changes to an internal state machine of the register module. The clock module is connected to the register module and is used to provide a clock source signal for the register module. The present invention further relates to a corresponding measurement control method. In the circuit structure and the measurement control method therefor, the problem of measurement precision caused by a system framework is avoided by mean of a hardware mode. Compared to a software mode, since the hardware mode is not affected by the working frequency of the system, the reliability is thus higher; and the power consumption of the system is further reduced, thereby having high practicality.

Description

Low-power thermo-hygrometer circuit structure and its measurement control method

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of the Chinese patent application filed on April 26, 2021 with the application number 202110463965.4 and the invention titled "Circuit Structure of Low-Power Thermo-Hygrometer and Its Measurement Control Method", the entire contents of which are approved by Reference is incorporated in this application.

technical field

The invention relates to the field of humidity thermometers, in particular to the technical field of temperature and humidity meters with low power consumption, in particular to a circuit structure of a low power consumption temperature and humidity meter and a measurement control method thereof.

Background technique

At present, the realization of temperature and humidity meters on the market is to construct an oscillator analog circuit through a reference resistor and a humidity/thermistor, and then the SOC system collects and compares the oscillating signals generated by the analog circuit. There are two main problems with the thermohygrometer that realizes the temperature and humidity function in this way: on the one hand, the accuracy of the measurement, in the process of information collection and processing, due to the influence of the SOC's own operating frequency and sampling mechanism, There is a certain delay between the MCU obtaining the "start sampling" command and the actual sampling process, which affects the timeliness of the collected information, thus affecting the accuracy of the measurement results; on the other hand, the power consumption The realization of low power consumption is also an important indicator for considering product performance.

In order to solve the problem of accuracy and power consumption of the thermo-hygrometer, the architecture shown in Figure 1 is adopted. In the specific operation process, firstly, MCU configures TIMER0/1, TIMER0 counts a fixed time T, and TIMER1 measures the number of oscillations N0 of the analog circuit in the case of the reference resistance within the time T, and the MCU reads the interrupt after receiving the interrupt generated by TIMER0 reaching time T. Take the value of N0; secondly, the MCU configures TIMER0/1 again to obtain the number of oscillations N1 of the analog circuit in the case of humidity/thermistor within the time T; finally, the software compares the values of N0 and N1.

In the above implementation method, in order to solve the problem of the accuracy of the measurement results, the software part calculates the error time between the interrupt generated by TIMER0 and the reading of the N0/N1 value by the MCU according to the operating frequency, and then the measurement results N0 and N1 are calculated according to the error time. Compensation is performed to eliminate errors. In order to solve the problem of power consumption, the system clock is switched to a low-speed clock when performing the temperature and humidity detection function, thereby reducing the overall power consumption of the system.

However, this implementation usually has the following disadvantages:

1. The measurement accuracy is optimized by means of software compensation, the compensation value depends on the operating frequency of the system, and the reliability is low.

2. In the application of temperature and humidity detection function, the actual participation time of MCU is very short, and most of them are in the counting state of TIMER0 and TIMER1. Since TIMER0 and MCU use the same source clock, it is not possible to directly turn off the clock source to make the MCU sleep. The only way to reduce power consumption is to reduce the operating frequency by means of frequency reduction. Therefore, in terms of power consumption, there is still a lot of room for optimization.

3. When the user operates, the register needs to be configured multiple times in one measurement cycle, the operation is complicated, and the program area occupies a large amount of space.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome at least one of the above shortcomings, and to provide a low power consumption thermohygrometer circuit structure and a measurement control method with low power consumption and more accurate measurement accuracy.

In order to achieve the above purpose, the circuit structure of the low-power thermohygrometer of the present invention and its measurement control method are as follows:

The main feature of the circuit structure of the low-power temperature and humidity meter is that the circuit structure includes:

a micro-control unit, the micro-control unit is connected with an external software module, and is used to configure the register module;

The register module is connected with the micro-control unit, and is used to realize the measurement of temperature and humidity through the change of the internal state machine of the register module;

A clock module, connected with the register module, is used for providing a clock source signal for the register module.

Preferably, the clock module is connected to an external low-frequency crystal oscillator and a high-frequency crystal oscillator to provide a clock source input signal for the circuit structure.

Preferably, the clock source input signal includes a low-speed clock signal and a high-speed clock signal.

Preferably, the clock module is connected to the micro-control unit and provides the micro-control unit with the high-speed clock signal, and the clock module provides the register module with the high-speed clock signal or the low-speed clock. Signal.

Preferably, the register module specifically includes:

a temperature and humidity control module, connected to the micro-control unit, for receiving a measurement start instruction sent by the micro-control unit, and sending measurement results to the micro-control unit;

a first counter, connected with the temperature and humidity control module and the micro-control unit, for receiving and executing the start measurement instruction;

The second counter is connected with the temperature and humidity control module and the micro-control unit, and is used for receiving and executing the start measurement instruction.

Preferably, the clock module is connected to the temperature and humidity control module, and is used to provide the temperature and humidity control module with a high-speed clock signal or a low-speed clock signal as a clock source input signal of the circuit structure;

Described clock module is connected with described first counter, is used to provide high-speed clock signal or low-speed clock signal for described first counter as the clock source input signal of described circuit structure;

The clock module is connected to the second counter through a selector, and is used to provide the second counter with a high-speed clock signal or a low-speed clock signal as a clock source input signal of the circuit structure; or

The second counter is connected to an external oscillator circuit through a selector, and is used for taking the square wave signal generated by the oscillator circuit as the clock source input signal of the circuit structure.

The main feature of the method for measuring and controlling a thermohygrometer based on the above circuit structure is that the method includes the following steps:

(1) The user sets the measurement duration as the start measurement instruction of the circuit structure through the software module;

(2) the register module receives and executes the start measurement instruction, and realizes the temperature and humidity measurement function through the change of the internal state machine of the register module;

(3) The circuit structure performs measurement work, and feeds back the measurement result to the user through the micro-control unit, so as to wait for the next measurement instruction.

Preferably, the register module specifically includes a temperature and humidity control module, a first counter and a second counter, wherein the temperature and humidity control module is respectively connected with the first counter and the second counter.

Preferably, the step (1) is specifically as follows: the user sets the measurement duration T and sends a measurement start instruction to the micro-control unit to perform the test work.

Preferably, the step (2) specifically includes the following steps:

(2.1) The micro-control unit configures the register module according to the start measurement instruction, and the micro-control unit enters a sleep state after completion;

(2.2) The temperature and humidity control module enters the first initialization state.

Preferably, the step (3) specifically includes the following steps:

(3.1) The described temperature and humidity control module performs the measurement work of the oscillation circuit under the reference resistance;

(3.2) when the measurement is completed, the temperature and humidity control module obtains the first measurement result;

(3.3) The temperature and humidity control module enters the second initialization state, and performs the measurement of the oscillation circuit under the sensor resistance;

(3.4) when the measurement is completed, the temperature and humidity control module obtains the second measurement result;

(3.5) The temperature and humidity control module wakes up the micro-control unit, and the micro-control unit reads the first measurement result and the second measurement result for data processing;

(3.6) The micro-control unit enters a dormant state and waits for the next measurement instruction to arrive.

Preferably, described step (3.1) specifically comprises the following steps:

(3.1.1) The temperature and humidity control module sends the start measurement instruction to the first counter and enters a dormant state;

(3.1.2) The first counter receives and executes the start measurement instruction, and loads the measurement duration T, and the temperature and humidity control module enters the reference resistance oscillation circuit measurement state.

Preferably, the step (3.2) specifically includes the following steps:

(3.2.1) When the count value of the first counter reaches the measurement duration T, the temperature and humidity control module enters the reference resistance oscillation circuit completion state;

(3.2.2) The temperature and humidity control module acquires and stores the count value of the second counter to acquire the first measurement result, and jumps into the initialization state of the sensor resistance oscillation circuit.

Preferably, described step (3.3) is specifically:

The first counter is initialized and reloaded with the measurement duration T, and jumps into the measurement state of the sensor resistance oscillating circuit.

Preferably, the step (3.4) specifically includes the following steps:

(3.4.1) When the calculated value of the first counter reaches the measurement duration T, the temperature and humidity control module jumps into the sensor resistance oscillation circuit completion state;

(3.4.2) The temperature and humidity control module obtains and stores the count value of the second counter to obtain the second measurement result.

The circuit structure of the low-power thermohygrometer and the measurement control method thereof of the present invention greatly optimize the overall structure of the circuit structure by designing the hardware module, and avoid the measurement accuracy problem caused by the system structure. The software method is not affected by the operating frequency of the system, has higher reliability, and greatly reduces the power consumption of the system architecture; for the user side, since there is no need to configure the registers multiple times, the work of repeated operations is reduced frequency, and the software part occupies less resources in the program area. Therefore, it is more convenient and simple for users to apply, and has a wider application value.

Description of drawings

FIG. 1 is a schematic diagram of an implementation architecture of a temperature and humidity meter according to an exemplary embodiment of the present application.

FIG. 2 is a schematic diagram of an overall frame structure of a circuit structure of a low-power thermohygrometer according to an exemplary embodiment of the present application.

FIG. 3 is a schematic diagram of an overall process flow of a method for measuring and controlling a low-power thermohygrometer according to an exemplary embodiment of the present application.

FIG. 4 is a schematic diagram of state transition of a low power consumption temperature and humidity control module according to an exemplary embodiment of the present application.

FIG. 5 is a sequence diagram of error analysis of measurement results for low power consumption temperature and humidity control according to an exemplary embodiment of the present application.

FIG. 6 is a sequence diagram of error analysis of measurement results for low power consumption temperature and humidity control according to an exemplary embodiment of the present application.

Detailed ways

In order to describe the technical content of the present invention more clearly, further description will be given below with reference to specific embodiments.

Please refer to FIG. 2. FIG. 2 shows the circuit structure of the low-power temperature and humidity meter, wherein the circuit structure includes:

Micro-control unit MCU, the micro-control unit MCU is connected with an external software module, and is used to configure the register module;

The register module is connected with the micro-control unit MCU, and is used to realize the measurement of temperature and humidity through the change of the internal state machine of the register module;

A clock module, the clock module is connected with the register module, and is used for providing a clock source signal for the register module.

As a preferred embodiment of the present invention, the clock module is connected to an external low-frequency crystal oscillator and a high-frequency crystal oscillator to provide a clock source input signal for the circuit structure.

As a preferred embodiment of the present invention, the clock source input signal includes a low-speed clock signal and a high-speed clock signal.

As a preferred embodiment of the present invention, the clock module is connected to the micro-control unit MCU, and provides the high-speed clock signal for the micro-control unit MCU, and the clock module is the The register module provides the high-speed clock signal or the low-speed clock signal.

As a preferred embodiment of the present invention, the register module specifically includes:

The temperature and humidity control module WSD_CTRL, connected with the micro-control unit MUC, is used for receiving the start measurement instruction sent by the micro-control unit MUC, and sending the measurement result to the micro-control unit MUC;

a first counter TIMER0, connected to the temperature and humidity control module WSD_CTRL and the micro-control unit MUC, for receiving and executing the start measurement instruction;

The second counter TIMER1 is connected to the temperature and humidity control module WSD_CTRL and the micro control unit MUC, and is used for receiving and executing the start measurement instruction.

As a preferred embodiment of the present invention, the clock module is connected to the temperature and humidity control module WSD_CTRL, and is used to provide the temperature and humidity control module WSD_CTRL with a high-speed clock signal or a low-speed clock signal as the clock of the circuit structure source input signal;

The clock module is connected with the first counter TIMER0, and is used to provide the first counter TIMER0 with a high-speed clock signal or a low-speed clock signal as a clock source input signal of the circuit structure;

The clock module is connected to the second counter TIMER1 through a selector, and is used to provide the second counter TIMER1 with a high-speed clock signal or a low-speed clock signal as the clock source input signal of the circuit structure; or

The second counter TIMER1 is connected to an external oscillator circuit through a selector, and is used for using the square wave signal generated by the oscillator circuit as the clock source input signal of the circuit structure.

The realization of the temperature and humidity function of the present invention mainly relies on the hardware design, and the entire temperature and humidity measurement workflow is guaranteed through the hardware design. The temperature and humidity control module WSD_CTRL ensures the entire temperature and humidity control module by controlling the first counter TIMER0 and the second counter TIMER1. The measurement process is carried out smoothly, and the first counter TIMER0 and the second counter TIMER1 are responsible for the specific measurement work, and report the relevant information obtained by the measurement to the temperature and humidity control module WSD_CTRL. The micro control unit MCU is responsible for the interaction with the software and hardware, mainly including two aspects, one is to send the "start measurement" command to the temperature and humidity control module WSD_CTRL and set the measurement time length, and the other is to end the measurement. Then, the measurement results are obtained from the temperature and humidity control module WSD_CTRL and reported to the software. In the design of the clock, the clock source of the microcontroller unit MCU is a high-speed clock, and the temperature and humidity control module WSD_CTRL and the first counter TIMER0 are clocked by WSD_CLK, and the WSD_CLK clock source can be switched between high-speed and low-speed clocks. When the temperature and humidity function of the second counter TIMER1 module is running, the clock input is the square wave generated by the analog oscillator circuit; when the temperature and humidity function is turned off, the clock input source is WSD_CLK.

Please refer to FIG. 3. FIG. 3 shows a method for measuring and controlling a thermo-hygrometer based on the above circuit structure, wherein,

As a preferred embodiment of the present invention, the method includes the following steps:

(2) the described register module receives and executes the described start measurement instruction, and realizes the measurement of the temperature and humidity function through the change of the internal state machine of the described register module;

(3) The circuit structure performs measurement work, and feeds back the measurement results to the user through the micro-control unit, so as to wait for the next measurement instruction.

In a specific embodiment of the present invention, the user sets the measurement duration through a software module and sends a measurement start instruction to the micro-control unit MCU, and the micro-control unit MCU configures the register part after receiving the corresponding start measurement instruction, and when the configuration is completed After that, it enters the sleep state. At this time, the temperature and humidity control module enters the initialization state and performs the measurement of the oscillation circuit under the reference resistance. After the measurement is completed, the first measurement result is obtained; then, the temperature and humidity control module enters the initialization state again and conducts oscillation under the sensor resistance. The circuit measurement works, and after the measurement is completed, the second measurement result is obtained. At this time, the micro-control unit MCU in the dormant state is woken up, and the micro-control unit MCU reads the results obtained from the two measurements and performs corresponding data processing. When the processing is completed, the micro-control unit MCU enters the dormant state again to Wait for the arrival of the next measurement command. By repeating the above steps in this way, the temperature and humidity function in the low power consumption state within the preset measurement duration can be realized.

As a preferred embodiment of the present invention, the register module specifically includes a temperature and humidity control module WSD_CTRL, a first counter TIMER0 and a second counter TIMER1, wherein the temperature and humidity control module WSD_CTRL is respectively associated with the first counter TIMER0 and the second counter TIMER1. The two counters TIMER1 are connected.

As a preferred embodiment of the present invention, the step (1) is specifically as follows: the user sets the measurement duration T and sends a measurement start instruction to the micro-control unit MUC for testing.

As a preferred embodiment of the present invention, the step (2) specifically includes the following steps:

(2.1) The micro-control unit MUC configures the register module according to the start measurement instruction, and the micro-control unit MUC enters a dormant state after completion;

(2.2) The temperature and humidity control module WSD_CTRL enters the first initialization state.

As a preferred embodiment of the present invention, the step (3) specifically includes the following steps:

(3.1) The described temperature and humidity control module WSD_CTRL performs the measurement work of the oscillation circuit under the reference resistance;

(3.2) The temperature and humidity control module WSD_CTRL described when the measurement is completed obtains the first measurement result;

(3.3) The temperature and humidity control module WSD_CTRL enters the second initialization state, and performs the measurement of the oscillating circuit under the sensor resistance;

(3.4) The temperature and humidity control module WSD_CTRL described when the measurement is completed obtains the second measurement result;

(3.5) The temperature and humidity control module WSD_CTRL wakes up the micro-control unit MUC, and the micro-control unit MUC reads the first measurement result and the second measurement result for data processing;

(3.6) The micro-control unit MUC enters a dormant state and waits for the arrival of the next measurement instruction.

As a preferred embodiment of the present invention, the step (3.1) specifically includes the following steps:

(3.1.1) The temperature and humidity control module WSD_CTRL sends the measurement start instruction to the first counter TIMER0 and enters a dormant state;

(3.1.2) The first counter TIMER0 receives and executes the start measurement instruction, and loads the measurement duration T, and the temperature and humidity control module WSD_CTRL enters the reference resistance oscillation circuit measurement state.

As a preferred embodiment of the present invention, the step (3.2) specifically includes the following steps:

(3.2.1) When the count value of the first counter TIMER0 reaches the measurement duration T, the temperature and humidity control module WSD_CTRL enters the reference resistance oscillation circuit completion state;

(3.2.2) The temperature and humidity control module WSD_CTRL acquires and stores the count value of the second counter TIMER1 to acquire the first measurement result, and jumps into the sensor resistance oscillation circuit initialization state.

As a preferred embodiment of the present invention, the step (3.3) is specifically:

The first counter TIMER0 is initialized and reloaded with the measurement duration T, and jumps into the measurement state of the sensor resistance oscillating circuit.

As a preferred embodiment of the present invention, the step (3.4) specifically includes the following steps:

(3.4.1) When the calculated value of the first counter TIMER0 reaches the measurement duration T, the temperature and humidity control module WSD_CTRL jumps into the sensor resistance oscillation circuit completion state;

(3.4.2) The temperature and humidity control module WSD_CTRL acquires and stores the count value of the second counter TIMER1 to acquire the second measurement result.

In a specific embodiment of the present invention, please refer to FIG. 4 . FIG. 4 shows the conversion process of the temperature and humidity control module of the present invention performing state machine changes, as shown below:

(a) The temperature and humidity control module is in sleep state (WSD_IDLE) after reset.

(b) After receiving the start command (wsd_start=1) sent by the microcontroller unit MCU, the temperature and humidity control module jumps into the reference resistance oscillation circuit initialization state (WSD_REF_INIT).

(c) In the initialization state of the reference resistance oscillation circuit, the first counter TIMER0 loads the measurement duration T configured by the microcontroller MCU, and jumps into the reference resistance oscillation circuit measurement state (WSD_REF_WAIT).

(d) When the count value of the first counter TIMER0 reaches the measurement duration T (timer0_int=1), the temperature and humidity control module jumps into the reference resistance oscillation circuit completion state (WSD_REF_DONE).

(e) In the completed state of the reference resistance oscillation circuit, the temperature and humidity control module acquires and stores the count value of the second counter TIMER1. After completion (timer1_done=1), jump into the sensor oscillation circuit initialization state (WSD_SEN_INIT).

(f) In the sensor resistance oscillation circuit initialization state, the first counter TIMER0 is initialized and reloaded with the measurement duration T configured by the microcontroller MCU, and jumps into the sensor resistance oscillation circuit measurement state (WSD_SEN_WAIT).

(g) When the count value of the first counter TIMER0 reaches the measurement duration T (timer0_int=1), the temperature and humidity control module jumps into the sensor resistance oscillation circuit completion state (WSD_SEN_DONE).

(h) In the completed state of the reference resistance oscillation circuit, the temperature and humidity control module acquires and stores the count value of the second counter TIMER1. After completion (timer1_done=1), jump back to the idle state, and the measurement is completed.

According to the operation flow chart of the thermo-hygrometer in FIG. 4 , it is clear that in the overall architecture of the present invention, when the measurement function of the thermo-hygrometer is running, the microcontroller MCU actually only sends instructions and collects data at the beginning and the end. Processing related work; in practical applications, this part of the work only takes up a very small part of the time. Therefore, the power consumption can be greatly reduced by the sleep design of the microcontroller unit MCU. In the design of the clock, the temperature and humidity control module and the clock source of the TIMER are designed to be switchable. Therefore, when the MCU enters the sleep state and the high-frequency clock is turned off, the temperature and humidity control module and TIMER can still be switched to the low-speed clock operation, which further reduces the power consumption and ensures the normal operation of the temperature and humidity meter function.

Referring to Figure 5, the temperature and humidity meter function is implemented by software. Since the microcontroller MCU receives the interrupt sent by the first counter TIMER0 and actually reads the count value of the second counter TIMER1, the microcontroller unit The MCU needs to perform some operations such as stacking the incoming interrupt first. During this period of time, the count of TIMER is still accumulating, so there is a certain error between the measured value read by the microcontroller unit MCU and the real value.

In a specific embodiment of the present invention, please refer to FIG. 6 . FIG. 6 shows that the technical solution realizes the temperature and humidity function by means of hardware. When the first counter TIMER0 reaches the measurement duration and generates an interruption, the second counter TIMER1 The current count value is loaded into the register wsd_result inside the temperature and humidity control module. wsd_result will hold the measurement value until it is cleared when the next measurement starts. Therefore, when the MCU receives the interrupt signal, enters the interrupt, and reads the register, the value will not be changed, thus eliminating the measurement error caused by the hardware delay.

It can be clearly seen from Figure 5 and Figure 6 that this technical solution uses the hardware architecture to effectively avoid the error value problem existing in the general measurement method through the register wsd_result inside the temperature and humidity control module, which not only greatly improves the The accuracy of the measurement accuracy, at the same time, the setting method is not affected by the operating frequency of the system, and the reliability is higher.

The circuit structure of the low-power thermo-hygrometer and the measurement control method thereof of the present invention greatly optimizes the overall structure of the circuit structure by designing the hardware module, and avoids the measurement accuracy problem caused by the system structure. It is solved by software, which is not affected by the operating frequency of the system, has higher reliability, and greatly reduces the power consumption of the system architecture; for the user side, since there is no need to configure the registers multiple times, repeated operations are reduced. The working frequency is higher, and the software part occupies less resources in the program area. Therefore, it is more convenient and simple for users to apply, and has a wider application value.

In this specification, the invention has been described with reference to specific embodiments thereof. However, it will be apparent that various modifications and changes can be made without departing from the spirit and scope of the invention. Accordingly, the specification and drawings are to be regarded in an illustrative rather than a restrictive sense.

Claims

A low power consumption thermo-hygrometer circuit structure, characterized in that it includes:

a micro-control unit, which is connected with an external software module and used to configure the register module;

The register module is connected with the micro-control unit, and is used to realize the measurement of temperature and humidity through the change of the internal state machine of the register module;

A clock module, the clock module is connected with the register module, and is used for providing a clock source signal for the register module.
The circuit structure of the low-power temperature and humidity meter according to claim 1, wherein the clock module is connected to an external low-frequency crystal oscillator and a high-frequency crystal oscillator, and is used for the circuit structure of the low-power temperature and humidity meter Provides a clock source input signal.
The circuit structure of the low-power thermo-hygrometer according to claim 2, wherein the clock source input signal includes a low-speed clock signal and a high-speed clock signal.
The circuit structure of the low-power thermo-hygrometer according to claim 3, wherein the clock module is connected to the micro-control unit, and provides the micro-control unit with the high-speed clock signal, and the The clock module provides the register module with the high-speed clock signal or the low-speed clock signal.
The circuit structure of the low-power thermo-hygrometer according to claim 3, wherein the register module comprises:

a temperature and humidity control module, connected to the micro-control unit, for receiving a measurement start instruction sent by the micro-control unit, and sending measurement results to the micro-control unit;

a first counter, connected with the temperature and humidity control module and the micro-control unit, for receiving and executing the start measurement instruction;

The second counter is connected with the temperature and humidity control module and the micro-control unit, and is used for receiving and executing the start measurement instruction.
The circuit structure of the low power consumption thermo-hygrometer according to claim 5, wherein,

The clock module is connected to the temperature and humidity control module, and is used to provide the temperature and humidity control module with a high-speed clock signal or a low-speed clock signal as a clock source input signal of the low-power temperature and humidity meter circuit structure;

The clock module is connected with the first counter, and is used to provide the first counter with a high-speed clock signal or a low-speed clock signal as the clock source input signal of the low-power thermo-hygrometer circuit structure;

The clock module is connected to the second counter through a selector, and is used to provide the second counter with a high-speed clock signal or a low-speed clock signal as a clock source input signal of the low-power thermohygrometer circuit structure; Alternatively, the second counter is connected to an external oscillator circuit through a selector, and is used to use the square wave signal generated by the oscillator circuit as the clock source input signal of the low power consumption thermo-hygrometer circuit structure.
A method for measuring and controlling a thermo-hygrometer based on the circuit structure of the low-power thermo-hygrometer according to claim 1, characterized in that it comprises the following steps:

(1) The user sets the measurement duration through the software module as the start measurement instruction of the low-power thermo-hygrometer circuit structure;

(2) the register module receives and executes the start measurement instruction, and realizes the temperature and humidity measurement function through the change of the internal state machine of the register module;

(3) The circuit structure of the low-power thermo-hygrometer performs measurement work, and feeds back the measurement results to the user through the micro-control unit, so as to wait for the next measurement instruction.
The method for measuring and controlling a temperature and humidity meter according to claim 7, wherein the register module comprises a temperature and humidity control module, a first counter and a second counter, wherein the temperature and humidity control module is respectively associated with the The first counter and the second counter are connected.
The method for measuring and controlling a thermo-hygrometer according to claim 8, wherein the step (1) is as follows: the user sets the measurement duration T and sends a measurement start instruction to the micro-control unit for testing.
The method for measuring and controlling a thermohygrometer according to claim 9, wherein the step (2) comprises the following steps:

(2.1) The micro-control unit configures the register module according to the start measurement instruction, and the micro-control unit enters a sleep state after completion;

(2.2) The temperature and humidity control module enters the first initialization state.
The method for measuring and controlling a thermohygrometer according to claim 10, wherein the step (3) comprises the following steps:

(3.1) The described temperature and humidity control module performs the measurement work of the oscillation circuit under the reference resistance;

(3.2) when the measurement is completed, the temperature and humidity control module obtains the first measurement result;

(3.3) The temperature and humidity control module enters the second initialization state, and performs the measurement of the oscillation circuit under the sensor resistance;

(3.4) when the measurement is completed, the temperature and humidity control module obtains the second measurement result;

(3.5) The temperature and humidity control module wakes up the micro-control unit, and the micro-control unit reads the first measurement result and the second measurement result for data processing;

(3.6) The micro-control unit enters a dormant state and waits for the next measurement instruction to arrive.
The method for measuring and controlling a thermohygrometer according to claim 11, wherein the step (3.1) comprises the following steps:

(3.1.1) The temperature and humidity control module sends the measurement start instruction to the first counter and enters a dormant state;

(3.1.2) The first counter receives and executes the start measurement instruction, and loads the measurement duration T, and the temperature and humidity control module enters the reference resistance oscillation circuit measurement state.
The method for measuring and controlling a thermohygrometer according to claim 12, wherein the step (3.2) comprises the following steps:

(3.2.1) When the count value of the first counter reaches the measurement duration T, the temperature and humidity control module enters the reference resistance oscillation circuit completion state;

(3.2.2) The temperature and humidity control module acquires and stores the count value of the second counter to acquire the first measurement result, and jumps into the initialization state of the sensor resistance oscillation circuit.
The method for measuring and controlling a thermohygrometer according to claim 12, wherein the step (3.3) is:

The first counter is initialized and reloaded with the measurement duration T, and jumps into the measurement state of the sensor resistance oscillating circuit.
The method for a low power consumption function of a thermo-hygrometer according to claim 14, wherein the step (3.4) comprises the following steps:

(3.4.1) When the calculated value of the first counter reaches the measurement duration T, the temperature and humidity control module jumps into the sensor resistance oscillation circuit completion state;

(3.4.2) The temperature and humidity control module obtains and stores the count value of the second counter to obtain the second measurement result.