CN215832755U

CN215832755U - Temperature and humidity recorder

Info

Publication number: CN215832755U
Application number: CN202121382668.9U
Authority: CN
Inventors: 杨春生
Original assignee: Zhuhai Megain Technology Co ltd
Current assignee: Zhuhai Megain Technology Co ltd
Priority date: 2021-06-21
Filing date: 2021-06-21
Publication date: 2022-02-15
Anticipated expiration: 2031-06-21

Abstract

The utility model discloses a temperature and humidity recorder which comprises an integrated chip, an antenna circuit, an auxiliary circuit, a temperature and humidity sensor circuit, a power supply circuit and a double-crystal oscillator circuit, wherein the power supply circuit is provided with at least three groups of power supply interfaces, working voltages with different voltage values are provided based on the at least three groups of power supply interfaces so as to ensure the stability control of output current, and meanwhile, the working of the temperature and humidity recorder is prevented from being influenced by the change of current.

Description

Temperature and humidity recorder

Technical Field

The utility model relates to the technical field of temperature and humidity recorders, in particular to a temperature and humidity recorder.

Background

The temperature and humidity recorder can measure temperature and humidity simultaneously, so that the temperature and humidity recorder is widely applied to life and work of modern people. Especially in cold chain transportation applications, the control of the operating current is very critical for the operation of many electrical devices or for products that need to be transported in a refrigerated environment.

At present, a temperature and humidity sensor usually comprises a main control chip, a data acquisition circuit and a power circuit, the power circuit is designed by adopting a voltage stabilizing chip, the voltage stabilizing chip is mainly used for ensuring stable voltage output, and certainly, in the prior art, the output of voltage and current is adjusted by designing an additional auxiliary circuit, but the circuit complexity of the temperature and humidity sensor is greatly increased, the ultra-thinning design is not convenient, the effect of current stability control is not good, especially, the temperature and humidity sensor is not good for a direct current power supply mode, and the adjusting effect is not good.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a temperature and humidity recorder, and aims to solve the technical problem that the working current of the conventional temperature and humidity recorder is unstable in a low-temperature environment.

In order to achieve the purpose, the temperature and humidity recorder provided by the utility model comprises an integrated chip integrated with a Bluetooth circuit and an NFC circuit, and an antenna circuit, an auxiliary circuit, a temperature and humidity sensor circuit, a power supply circuit and a double-crystal oscillator circuit which are respectively connected with the integrated chip; the integrated chip comprises four groups of I/O interfaces, a group of crystal oscillator interfaces, a plurality of groups of power interfaces, a group of antenna interfaces and other function control interfaces; the antenna circuit is connected with the antenna interface and used for receiving a trigger signal sent by external equipment through Bluetooth or NFC and sending temperature and humidity data acquired by the temperature and humidity sensor circuit to the external equipment; the auxiliary circuit is electrically connected with the other function control interfaces and is used for providing required auxiliary signals for the work of the integrated chip; the temperature and humidity sensor circuit is connected with a first group of I/O interfaces in the four groups of I/O interfaces, and is used for acquiring temperature and humidity data of the environment where the temperature and humidity recorder is located and returning the temperature and humidity data to the integrated chip through the first group of I/O interfaces; the power supply circuit comprises at least three groups of power supply interfaces, and the power supply interfaces are connected with the power supply interfaces, wherein the at least three groups of power supply interfaces respectively output working voltages with different voltage values; the dual-crystal oscillator circuit is respectively connected with the crystal oscillator interface and a second group of I/O interfaces in the I/O interfaces and is used for controlling different working states of the temperature and humidity recorder.

In an embodiment of the present invention, the temperature and humidity recorder further includes a low temperature protection circuit connected in parallel to the power supply circuit; if the temperature and humidity recorder is in a dormant state, the power supply circuit charges the low-temperature protection circuit; and if the temperature and humidity recorder is in an awakening state, the low-temperature protection circuit discharges electricity and provides working current for the temperature and humidity recorder together with the power supply circuit.

In an embodiment of the present invention, the low-temperature protection circuit is an energy storage circuit, the energy storage circuit includes a button battery and at least two capacitors respectively connected in parallel with the button battery, and the at least two capacitors are connected in parallel with the power supply circuit.

In an embodiment of the present invention, the power supply circuit includes a digital circuit power supply circuit, an analog circuit power supply circuit, a memory circuit power supply circuit, and a main power supply circuit; one ends of the digital circuit power supply circuit, the analog circuit power supply circuit, the memory circuit power supply circuit and the main power supply circuit are connected with the ground, and the other ends of the digital circuit power supply circuit, the analog circuit power supply circuit, the memory circuit power supply circuit and the main power supply circuit are respectively connected with a digital circuit interface, an analog circuit interface, a memory circuit interface and an external power supply interface in the multiple groups of power supply interfaces.

In an embodiment of the present invention, the power supply circuit further includes a power supply hysteresis control circuit connected in parallel with the main power supply circuit.

In an embodiment of the utility model, the supply hysteresis circuit is composed of at least two first capacitors connected in parallel.

In an embodiment of the present invention, the dual-crystal oscillator circuit includes a first crystal oscillator circuit and a second crystal oscillator circuit that are connected to ground at the same time, the first crystal oscillator circuit is connected to the crystal oscillator interface, and the second crystal oscillator circuit is connected to the second group of I/O interfaces.

In an embodiment of the present invention, the auxiliary circuit includes: the activation circuit is connected with the I/O interface, and the activation circuit and the second crystal oscillator circuit are arranged on the same group of I/O interfaces and are used for controlling the temperature and humidity recorder to be switched from a dormant state to an awakening state; and the display circuit is connected with a third group of I/O interfaces in the four groups of I/O interfaces.

In an embodiment of the present invention, the temperature and humidity sensor circuit includes three resistors, two capacitors, and a temperature and humidity sensor chip, wherein a first pin and a sixth pin of the temperature and humidity sensor chip are respectively connected to a first data pin and a first control pin of the integrated chip, and a second pin and a fourth pin of the temperature and humidity sensor chip are grounded; first connecting ends of the three resistors are connected with a data acquisition pin of the integrated chip after being connected with each other, and second connecting ends of the three resistors are sequentially connected with a first pin, a third pin and a sixth pin of the temperature and humidity sensor chip; and the first connecting end of the two capacitors after being connected in parallel is connected with the first connecting end of the resistor, and the second connecting end of the two capacitors after being connected in parallel is connected with the fourth pin of the temperature and humidity sensor chip.

In an embodiment of the present invention, the temperature and humidity recorder further includes a data storage circuit connected to the plurality of groups of I/O interfaces, and configured to store the temperature and humidity data acquired by the temperature and humidity sensor circuit.

The temperature and humidity recorder in the technical scheme of the utility model comprises an integrated chip, an antenna circuit, an auxiliary circuit, a temperature and humidity sensor circuit, a power supply circuit and a double-crystal oscillator circuit, wherein the power supply circuit is provided with at least three groups of power supply interfaces, and provides working voltages with different voltage values based on the at least three groups of power supply interfaces so as to ensure the stability control of output current, and simultaneously provides voltages for circuits with different requirements, so that the influence on the work of the temperature and humidity recorder due to the change of current is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a temperature and humidity recorder according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram of a power supply circuit according to the present invention;

FIG. 3 is a schematic diagram of a low temperature protection circuit according to the present invention;

FIG. 4 is a schematic diagram of a temperature and humidity sensor circuit according to the present invention;

FIG. 5 is a schematic structural diagram of a temperature and humidity recorder according to a second embodiment of the present invention

FIG. 6 is a schematic diagram of a data storage circuit according to the present invention;

FIG. 7 is a schematic diagram of an antenna circuit according to the present invention;

FIG. 8 is a schematic circuit diagram of an integrated chip and antenna circuit of the present invention;

FIG. 9 is a schematic circuit diagram of a first crystal oscillator circuit according to the present invention;

fig. 10 is a schematic circuit diagram of a second oscillator circuit according to the present invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a temperature and humidity recorder, please refer to fig. 1, the temperature and humidity recorder includes: the temperature and humidity sensor circuit comprises an integrated chip 10, an antenna circuit 20, an auxiliary circuit 30, a temperature and humidity sensor circuit 40, a power supply circuit 50 and a dual-crystal oscillator circuit 60, wherein the integrated chip 10 is an integrated chip integrated with a Bluetooth circuit and an NFC circuit.

In this embodiment, the antenna circuit 20, the auxiliary circuit 30, and the temperature and humidity sensor circuit 40 are all connected to the integrated chip 10, wherein a serial communication circuit is provided between the temperature and humidity sensor circuit 40 and the integrated chip 10, and when the temperature and humidity sensor circuit 40 collects temperature and humidity data or triggers reading of the temperature and humidity data, the temperature and humidity sensor circuit 40 feeds back the data through the serial communication circuit. The power supply circuit 50 is connected to the integrated chip 10, the antenna circuit 20, the auxiliary circuit 30, and the temperature/humidity sensor circuit 40, respectively, to provide an operating voltage.

The integrated chip 10 is provided with a plurality of groups of interfaces with different functions, specifically four groups of I/O interfaces, a group of crystal oscillator interfaces, a plurality of groups of power interfaces, a group of antenna interfaces and other function control interfaces, wherein the antenna circuit 20 is connected with the antenna interfaces and is used for receiving a trigger signal sent by external equipment through bluetooth or NFC and sending temperature and humidity data acquired by the temperature and humidity sensor circuit 40 to the external equipment;

the auxiliary circuit 30 is electrically connected to other function control interfaces, and is used for providing auxiliary signals required by the operation of the integrated chip 10;

the temperature and humidity sensor circuit 40 is connected with a first group of I/O interfaces in the four groups of I/O interfaces, and is used for collecting temperature and humidity data of the environment where the temperature and humidity recorder is located and returning the temperature and humidity data to the integrated chip through the first group of I/O interfaces;

the power supply circuit 50 includes at least three groups of power supply interfaces, and the power supply interfaces are connected to the power supply interfaces, wherein the at least three groups of power supply interfaces respectively output working voltages with different voltage values; in practical application, each power supply interface is correspondingly connected with one power supply interface.

The dual-crystal oscillator circuit 60 is respectively connected with the crystal oscillator interface and a second group of I/O interfaces in the I/O interfaces, and is used for controlling different working states of the temperature and humidity recorder.

In this embodiment, the at least three groups of power supply interfaces are power supply interfaces for supplying power to different types of integrated circuits in the integrated chip 10, for example: the power supply interface of 1V, the power supply interface of 1.3V and the power supply interface of 1.8V, specifically VDD _1V, 1V2 and VDD _ F in fig. 2, and further includes a total power supply interface + BATT.

Specifically, the power supply circuit 50 includes a digital circuit power supply circuit (i.e., a partial circuit corresponding to VDD _ 1V), an analog circuit power supply circuit (i.e., a partial circuit corresponding to 1V 2), a memory circuit power supply circuit (i.e., a partial circuit corresponding to VDD _ F), and a total power supply circuit (i.e., a partial circuit corresponding to + BATT);

one ends of the digital circuit power supply circuit, the analog circuit power supply circuit, the memory circuit power supply circuit and the main power supply circuit are connected with the ground, and the other ends of the digital circuit power supply circuit, the analog circuit power supply circuit, the memory circuit power supply circuit and the main power supply circuit are respectively connected with a digital circuit interface, an analog circuit interface, a memory circuit interface and an external power supply interface in the multiple groups of power supply interfaces.

In practical applications, the digital circuit power supply circuit, the analog circuit power supply circuit, the memory circuit power supply circuit and the main power supply circuit are circuits whose output terminals are labeled as VDD _1V, 1V2, VDD _ F and + BATT in fig. 2, respectively.

In this embodiment, all the power circuits described above are implemented by using capacitors with different numbers in parallel, where the digital circuit power circuit and the memory power circuit respectively implement stable power output by a capacitor of 1uF and a capacitor of 10uF, VDD _1V provides power for the digital circuit inside the chip, and is generated by the built-in LDO, and the value: 1V and VDD _ F provide power for Flash inside the chip, and are generated inside the chip and have the values: 1.8V.

The analog circuit power supply circuit and the total power supply circuit are respectively realized by connecting four capacitors with different capacities and three capacitors with the same capacity in parallel, 1V2 provides power for the analog circuit in the chip, and the power is generated by a built-in DCDC (direct current DC) and has the value: 1.3V and + BATT provides 1.8-3.6V power for the whole chip.

In the present embodiment, the power supply circuit 50 further includes a power supply hysteresis control circuit, which is connected in parallel with the main power supply circuit. The circuit formed by two capacitors as shown in the dashed box in fig. 2 is formed by connecting two 100uF capacitors in parallel and then connecting the two capacitors in parallel with a main power circuit, and the circuit is formed by at least two first capacitors (such as C25 and C26 in fig. 2) connected in parallel. The power supply hysteresis control circuit mainly has the function of weakening the hysteresis effect of the power supply circuit 50, and particularly when a battery is used as a main power supply, the temperature and humidity recorder can normally work within the working temperature range of-30-70 ℃, so that the service life is prolonged.

In this embodiment, as shown in fig. 5, the temperature and humidity recorder further includes a low-temperature protection circuit 70, the temperature and humidity recorder may have different operation controls on the low-temperature protection circuit 70 in sleep and wake-up states, the low-temperature protection circuit 70 is connected in parallel with the power supply circuit 50, the internal resistance of the power supply circuit 50 may become very large in a low-temperature environment, but the power supply circuit 50 may still output a certain voltage and a small current, the low-temperature protection circuit 70 connected in parallel to the power supply circuit 50 is charged by the small current, and after the recorder wakes up the low-temperature protection circuit 70, the low-temperature protection circuit 70 may instantaneously discharge to provide a current meeting the operation requirements of the temperature and humidity recorder.

Based on the above situation, the low temperature protection circuit 70 may be configured as a tank circuit, which is connected in parallel with the power supply circuit 50, and when the integrated chip 10 outputs the start signal, the tank circuit and the power supply circuit 50 work simultaneously to provide a large instantaneous current to the integrated chip 10.

In practical applications, as shown in fig. 3, the low temperature protection circuit 70 includes a button cell and at least two capacitors respectively connected in parallel with the button cell, and the at least two capacitors are connected in parallel with the power supply circuit 50.

In an embodiment of the present invention, the low-temperature protection circuit 70 may also be configured as a circuit having a heating function, the power supply circuit 50 may be kept in a certain temperature environment for operation in real time by heating, and certainly, the power supply circuit 50 may also be heated in a short time when the humiture recorder wakes up, in practical application, the low-temperature protection circuit 70 includes a heating circuit and a control switch connected in series with the heating circuit, and the control switch is directly connected to the positive electrode and the negative electrode of the power supply circuit 50, and when the integrated chip 10 outputs a start signal, the control switch is closed to turn on the heating circuit, so that the heating circuit operates.

In this embodiment, the circuits are uniformly distributed on the PCB, and the fixed installation of the circuits is realized by fixing the PCB on the housing, in practical application, the housing includes a first housing and a second housing;

the first shell is provided with a mounting cavity which is adapted to a PCB (printed circuit board) for bearing the integrated chip 10, the antenna circuit 20, the temperature and humidity acquisition circuit 40 and the serial port communication circuit;

the second shell is provided with a matching cavity matched with the mounting cavity;

the PCB is fixed in a cavity formed when the installation cavity and the matching cavity are closed in an interference fit installation mode.

In practical application, the housing may be a plastic housing or a metal housing, and the housing is provided with a battery cavity, which may be configured adaptively according to the type of the battery, for example, the battery is a button-type battery, and the battery cavity may be correspondingly configured to be cylindrical; or the battery adopts a square lithium battery, and the battery cavity can be correspondingly set into a square cavity. The battery cavity is provided with a mounting port (not marked) for installing a battery, and the battery is arranged on the shell through the mounting port and is connected with the circuits to provide corresponding voltage so as to provide working energy.

In this embodiment, please refer to fig. 4, in order to enable the temperature and humidity recorder to more accurately and precisely collect temperature and humidity data in an environment where the temperature and humidity recorder is located, the temperature and humidity collecting circuit 40 is configured as the following structure, the temperature and humidity sensor circuit 40 includes three resistors (respectively, R6, R5, and R4 in the figure), two capacitors (respectively, C22, C23 in the figure), and a temperature and humidity sensor chip (e.g., U2 in the figure), in practical application, the temperature and humidity sensor chip is implemented by using a sensor of the type STH30, the temperature and humidity sensor chip includes 7 pins, a first pin and a sixth pin of the temperature and humidity sensor chip are respectively connected with a first data pin and a first control pin (i.e., pins corresponding to two tags, SCL and SDA in fig. 8) in the integrated chip 10, after the temperature and humidity sensor chip detects the temperature and humidity data in the environment, the temperature and humidity sensor chip is transmitted to the integrated chip 10 through a connecting circuit of the first pin and the sixth pin, and the second pin and the fourth pin of the temperature and humidity sensor chip are grounded;

in this embodiment, the first connection ends of the three resistors R6, R5, and R4 are connected to each other and then connected to the data acquisition pin (i.e., the TMPVCC pin) of the integrated chip 10, the second connection ends of the three resistors R4, R6, and R5 are connected to the first pin, the third pin, and the sixth pin of the temperature and humidity sensor chip, respectively, and the fifth pin of the temperature and humidity sensor chip is shorted to the first connection ends of the three resistors.

In this embodiment, two capacitors C22 and C23 are connected in parallel, and two pins after the parallel connection are respectively connected with the first connection end of the resistor and the ground, that is, the first connection end after the parallel connection of the two capacitors C22 and C23 is connected with the first connection end of the resistor, and the second connection end after the parallel connection of the two capacitors C22 and C23 is connected with the fourth pin of the temperature and humidity sensor chip and is grounded at the same time.

In an embodiment of the present invention, the temperature and humidity sensor circuit 40 further includes a temperature sensor chip, the temperature sensor chip is provided with 6 pins, the first pin and the sixth pin of the temperature sensor chip are respectively connected to the second data pin and the second control pin in the integrated chip 10, in practical applications, the second data pin and the second control pin specifically select an I/O interface in the integrated chip to implement any two interfaces PB as shown in fig. 8, the second pin of the temperature sensor chip is grounded, connection relationships between other pins, the three resistors R6, R5, R4, and the two capacitors C22 and C23 are the same as the connection relationship between the temperature sensor chip, which is not described herein again, and preferably, the temperature and humidity sensor chip selects a sensor with a model of TMP 112/102.

In an embodiment of the present invention, the temperature and humidity recorder may further communicate with an external device, and send acquired temperature and humidity data to a target terminal, specifically, the temperature and humidity data is sent through an antenna circuit 20, where the antenna circuit 20 includes at least two LC filter circuits, a first resistor R17 and an antenna U6, in practical application, one LC filter circuit design is selected, as shown in fig. 7 and 8, the LC filter circuit includes a first inductor L2 and a second capacitor C1 that are sequentially connected in series, a first input end a is disposed at one end of the first inductor L2, which is connected to the second capacitor C1, a second input end B and a third capacitor C5 are disposed at one end of the first inductor L2, which is not connected to the second capacitor C1, and the third capacitor C5 is connected to ground. The first input terminal a and the second input terminal B are respectively connected to an antenna pin in the integrated chip 10.

In practical applications, the antenna circuit 20 is specifically an antenna circuit triggered by bluetooth, that is, the antenna circuit is matched with a bluetooth function in a near field communication function in the integrated chip 10, specifically, the antenna circuit 20 includes an LC filter circuit, an impedance matching circuit and a coupling capacitor, one end of the impedance matching circuit is connected to one end of the coupling capacitor, the other end of the coupling capacitor is connected to one end of the LC filter circuit, and the other end of the impedance matching circuit is connected to the first resistor R17.

As shown in fig. 8, the impedance matching circuit is a pi-type circuit, and includes a fourth capacitor C3, a second inductor L1, and a fifth capacitor C4 connected in series; one end of the fourth capacitor C3 connected with the second inductor L1 is connected with the coupling capacitor C2, and the other end of the fourth capacitor C3 is grounded; one end of the fifth capacitor C4 connected to the second inductor L1 is connected to the first resistor R17, and the other end of the fifth capacitor C4 is grounded.

The temperature and humidity data are transmitted through the antenna circuit 20, and since the first inductor L2 and the second capacitor C1 form an LC filter circuit, a high-frequency part in the VANT is filtered out, and a pure power supply is obtained for the antenna; c2 is a coupling capacitor, isolates the direct current power supply, and couples the modulation signal of the ANT to the pi-shaped circuit; the second inductor L1, the fourth capacitor C3 and the fifth capacitor C4 form an n-shaped circuit, so that impedance matching is realized, the maximum power transmission is realized, and the index of the antenna reaches the best state; the first resistor R17 is mainly used as a test point of the antenna matching circuit, and is convenient for accessing an instrument for testing.

In an embodiment of the present invention, the auxiliary circuit 30 is disposed at the periphery of the integrated chip 10 and connected to the integrated chip 10, and when the temperature and humidity recorder is powered on, the auxiliary circuit outputs a control signal to control the integrated chip 10 to operate.

The auxiliary circuit 30 includes a data export interface circuit and a reset circuit respectively connected to the integrated chip 10, and the data export interface circuit is specifically a circuit of near field communication such as a USB interface circuit and a bluetooth circuit.

In this embodiment, the auxiliary circuit 30 further includes an activation circuit connected to the second group of I/O interfaces, and configured to control the temperature and humidity recorder to switch from the sleep state to the wake state; and the display circuit is connected with a third I/O interface in the four groups of I/O interfaces.

As shown in fig. 8, the integrated chip 10 uses a semiconductor silicon wafer with model number TLSR8251F512ET48, and the auxiliary circuit 30 includes a third inductor L3 and a fifth capacitor C12, wherein the third inductor L3 is connected in parallel to the VDCDC _ SW pin and the VDCDC pin in the integrated chip, the fifth capacitor C12 is connected to the reset pin and simultaneously connected to the reset circuit, and the third inductor L3 is used as a power inductor and is an energy storage element of the DCDC circuit on the VDCDC pin in the integrated chip 10.

In this embodiment, since the temperature and humidity recorder has two working states, the dual-crystal oscillator circuit 60 includes two crystal oscillator circuits, specifically, as shown in fig. 9 and 10, a first crystal oscillator circuit and a second crystal oscillator circuit, respectively, where the first crystal oscillator circuit is connected to the crystal oscillator interface and is used for controlling the integrated chip 10, that is, controlling the operation of the temperature and humidity recorder; the second crystal oscillator circuit is connected with the second group of I/O interfaces and used for controlling the working state of the temperature and humidity recorder, namely the sleeping state or the awakening state.

In this embodiment, the humiture recorder further includes a test interface circuit and a burning interface circuit, specifically, the setting of the test interface circuit is realized by extending a pin header or a USB interface in two pins, namely TX pin and RX pin, in the integrated chip, and similarly, the pin header or the USB interface is also extended by extending a pin header or a USB interface in two pins, namely RST pin and SWS pin, in the integrated chip, and the pin header or the USB interface is also connected to the positive electrode and the negative electrode of the power supply, so as to realize the setting of the burning interface circuit.

In this embodiment, the temperature and humidity recorder further includes a data storage circuit 80 connected to the plurality of sets of I/O interfaces, and configured to store temperature and humidity data collected by the temperature and humidity sensor circuit 40. As shown in fig. 5 and 6, the data storage circuit 80 includes a memory chip U4, two capacitors (e.g., C20 and C21 in the figure) with different capacities, and a resistor R9, wherein one end of the resistor R9 is connected to the first pin of the memory chip U4, the other end of the resistor R9 is connected to the seventh and eighth pins of the memory chip U4, and the other end of the resistor R9 connected to the seventh and eighth pins of the memory chip U4 is connected to the main power interface of the power supply circuit 50; after the two capacitors C20 and C21 are connected in parallel, one end is connected to the seventh and eighth pins of the memory chip U4, and the other end is grounded. The first pin, the second pin, the fifth pin and the sixth pin of the memory chip U4 are connected to the integrated chip 10.

Through the implementation of the temperature and humidity recorder, the temperature and humidity recorder is designed by adopting an integrated chip with a data processing function, so that a circuit can be simplified, and the possibility of ultrathin design is provided. Meanwhile, an antenna transmitting circuit is arranged, and the master control IC circuit is triggered to process the temperature and humidity data acquired by the temperature and humidity acquisition circuit and generate a derived report through the antenna transmitting circuit.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The utility model provides a humiture record appearance, its characterized in that, humiture record appearance includes:

the device comprises an integrated chip integrated with a Bluetooth circuit and an NFC circuit, and an antenna circuit, an auxiliary circuit, a temperature and humidity sensor circuit, a power supply circuit and a double-crystal oscillator circuit which are respectively connected with the integrated chip;

the integrated chip comprises four groups of I/O interfaces, a group of crystal oscillator interfaces, a plurality of groups of power interfaces, a group of antenna interfaces and other function control interfaces;

the antenna circuit is connected with the antenna interface and used for receiving a trigger signal sent by external equipment through Bluetooth or NFC and sending temperature and humidity data acquired by the temperature and humidity sensor circuit to the external equipment;

the auxiliary circuit is electrically connected with the other function control interfaces and is used for providing required auxiliary signals for the work of the integrated chip;

the temperature and humidity sensor circuit is connected with a first group of I/O interfaces in the four groups of I/O interfaces, and is used for acquiring temperature and humidity data of the environment where the temperature and humidity recorder is located and returning the temperature and humidity data to the integrated chip through the first group of I/O interfaces;

the power supply circuit comprises at least three groups of power supply interfaces, and the power supply interfaces are connected with the power supply interfaces, wherein the at least three groups of power supply interfaces respectively output working voltages with different voltage values;

the dual-crystal oscillator circuit is respectively connected with the crystal oscillator interface and a second group of I/O interfaces in the I/O interfaces and is used for controlling different working states of the temperature and humidity recorder.

2. The temperature and humidity recorder according to claim 1, further comprising a low temperature protection circuit connected in parallel with the power supply circuit;

if the temperature and humidity recorder is in a dormant state, the power supply circuit charges the low-temperature protection circuit;

and if the temperature and humidity recorder is in an awakening state, the low-temperature protection circuit discharges electricity and provides working current for the temperature and humidity recorder together with the power supply circuit.

3. The temperature and humidity recorder according to claim 2, wherein the low temperature protection circuit is an energy storage circuit, the energy storage circuit comprises a button battery and at least two capacitors respectively connected in parallel with the button battery, and the at least two capacitors are connected in parallel with the power supply circuit.

4. The humiture recorder according to claim 1, wherein said power supply circuit includes a digital circuit power supply circuit, an analog circuit power supply circuit, a memory circuit power supply circuit and a main power supply circuit;

5. The temperature and humidity recorder according to claim 4, wherein the power supply circuit further comprises a power supply hysteresis control circuit connected in parallel with the main power supply circuit.

6. The humiture recorder according to claim 5, wherein said power supply hysteresis circuit is comprised of at least two first capacitors connected in parallel.

7. The humiture recorder according to claim 5, wherein the dual crystal oscillator circuit includes a first crystal oscillator circuit and a second crystal oscillator circuit both connected to ground, the first crystal oscillator circuit being connected to the crystal oscillator interface, the second crystal oscillator circuit being connected to the second set of I/O interfaces.

8. The humiture recorder according to claim 7, wherein said auxiliary circuit comprises:

the activation circuit is connected with the I/O interface, and the activation circuit and the second crystal oscillator circuit are arranged on the same group of I/O interfaces and are used for controlling the temperature and humidity recorder to be switched from a dormant state to an awakening state;

and the display circuit is connected with a third group of I/O interfaces in the four groups of I/O interfaces.

9. The temperature and humidity recorder according to any one of claims 1-4, wherein the temperature and humidity sensor circuit comprises three resistors, two capacitors and a temperature and humidity sensor chip, wherein a first pin and a sixth pin of the temperature and humidity sensor chip are respectively connected to a first data pin and a first control pin of the integrated chip, and a second pin and a fourth pin of the temperature and humidity sensor chip are grounded;

first connecting ends of the three resistors are connected with a data acquisition pin of the integrated chip after being connected with each other, and second connecting ends of the three resistors are respectively connected with a first pin, a third pin and a sixth pin of the temperature and humidity sensor chip;

and the first connecting end of the two capacitors after being connected in parallel is connected with the first connecting end of the resistor, and the second connecting end of the two capacitors after being connected in parallel is connected with the fourth pin of the temperature and humidity sensor chip.

10. The temperature and humidity recorder according to any one of claims 1-4, further comprising a data storage circuit connected to the plurality of I/O interfaces for storing temperature and humidity data collected by the temperature and humidity sensor circuit.