CN216206600U - Small-sized humiture recorder - Google Patents
Small-sized humiture recorder Download PDFInfo
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- CN216206600U CN216206600U CN202122531496.3U CN202122531496U CN216206600U CN 216206600 U CN216206600 U CN 216206600U CN 202122531496 U CN202122531496 U CN 202122531496U CN 216206600 U CN216206600 U CN 216206600U
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Abstract
The utility model discloses a small-sized humiture recorder which comprises a humiture acquisition module, a data derivation circuit and a power circuit, wherein the humiture acquisition module comprises a main control IC, a humiture sensing IC and a storage IC, the humiture sensing IC and the storage IC are respectively connected with the main control IC, the main control IC controls the humiture sensing IC to work according to a received trigger signal sent from the outside to acquire humiture data, and then the humiture data is processed and sent to the storage IC to be stored; the data export circuit is connected with storage IC and master control IC respectively, receives data export order at master control IC, and the connection of switch-on data export circuit and storage IC is through the circuit of a plurality of IC chips of integration on a module to improve the integrated level of humiture record appearance circuit board structure, compare in the design of many circuit boards among the prior art, its volume can further reduce, provides probably for realizing the product miniaturization.
Description
Technical Field
The utility model relates to the technical field of temperature and humidity detection, in particular to a small temperature and humidity recorder.
Background
Present temperature and humidity monitor includes control circuit, antenna, sensor interface and battery, wherein the outside temperature and humidity sensor of sensor interface connection, it is also that current temperature and humidity detector comprises two parts, be temperature and humidity detection box and temperature and humidity sensor respectively, and the circuit design of two parts all can occupy great volume, along with the little and smart development trend of product, such greenhouse degree monitor is not convenient for to the improvement of little volume product, so need to improve urgently.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide a small temperature and humidity recorder, and aims to solve the technical problem that the existing temperature and humidity recorder is difficult to miniaturize due to a complex circuit structure.
In order to achieve the above object, the present invention provides a small-sized temperature and humidity recorder, comprising: the temperature and humidity acquisition module, the data export circuit and the power circuit are used for providing working voltage for the temperature and humidity acquisition module and the data export circuit;
the temperature and humidity acquisition module comprises a main control IC, a temperature and humidity sensing IC and a storage IC which are provided with at least one group of SPI interfaces and at least one group of I2C interfaces, and a basic drive circuit group which is simultaneously connected with the main control IC, the sensing IC and the storage IC;
temperature and humidity sensing IC and SPI interface connection, storage IC and I2C interface connection, data derivation circuit pass through SPI interface and master control IC electric connection, and be connected with the storage IC.
In an embodiment of the utility model, the data export circuit comprises a USB connector with 4 pins, a voltage division circuit, two current-limiting resistors and a voltage reduction circuit;
the voltage division circuit is connected with a first pin in the USB connector and then grounded;
the voltage reduction circuit is connected with a first pin in the USB connector and then connected with the positive output end of the power supply circuit;
the first ends of the two current-limiting resistors are respectively arranged on the second pin and the third pin in the USB joint, and the second ends of the two current-limiting resistors are connected with the master control IC.
In an embodiment of the present invention, the master IC further includes a CS interface, an SCLK interface, an SI interface, an SO interface, an SCL interface, and an SDA interface, where the CS interface, the SCLK interface, the SI interface, and the SO interface are connected to the storage IC, and the SCL interface and the SDA interface are connected to the temperature and humidity sensing IC.
In an embodiment of the utility model, the temperature and humidity acquisition module further comprises a pull-up resistor and two bypass capacitors, wherein one end of each of the two bypass capacitors after being connected in parallel is simultaneously connected with the positive output ends of the storage IC and the power circuit, and the other end of each of the two bypass capacitors is connected with the ground of the power circuit; one end of the pull-up resistor is connected with the CS interface, and the other end of the pull-up resistor is connected with the positive output end of the power supply circuit.
In an embodiment of the present invention, the temperature and humidity acquisition module further includes three resistors and two capacitors, wherein a first pin and a sixth pin of the temperature and humidity sensing IC are respectively connected to an SCL interface and an SDA interface in the main control IC, and a second pin and a fourth pin of the temperature and humidity sensing IC are grounded;
first connecting ends of the three resistors are connected with a data acquisition pin of the master control IC 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 sensing IC;
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 sensing IC.
In an embodiment of the present invention, the master IC is a single chip microcomputer with an M0 core.
In an embodiment of the utility model, the small-sized temperature and humidity recorder further includes an antenna circuit and a crystal oscillator circuit, and the antenna circuit and the crystal oscillator circuit are disposed on the main control IC and integrated with the main control IC.
In an embodiment of the present invention, the antenna circuit includes an LC filter circuit, an impedance matching circuit, a coupling capacitor, a first resistor, and an antenna, which are connected in sequence; one end of the impedance matching circuit is connected with one end of the coupling capacitor, the other end of the coupling capacitor is connected with one end of the LC filter circuit, and the other end of the impedance matching circuit is connected with the first resistor.
In an embodiment of the utility model, the small-sized temperature and humidity recorder further comprises a low-temperature protection circuit connected in parallel with the power circuit;
if the small temperature and humidity recorder is in a dormant state, the power supply circuit charges the low-temperature protection circuit;
if the small-sized temperature and humidity recorder is in an awakening state, the low-temperature protection circuit discharges electricity and provides working voltage for the temperature and humidity sensing IC together with the power circuit.
In an embodiment of the utility model, the small-sized temperature and humidity recorder further includes a second crystal oscillator circuit, which is connected to the SPI interface in the main control IC, and is configured to output a pulse signal to control the temperature and humidity sensing IC to switch to the low power consumption state when the small-sized temperature and humidity recorder is in the sleep state.
The small-sized humiture recorder in the technical scheme of the utility model comprises a humiture acquisition module, a data derivation circuit and a power circuit, wherein the humiture acquisition module comprises a main control IC, a humiture sensing IC and a storage IC, the humiture sensing IC and the storage IC are respectively connected with the main control IC, the main control IC controls the humiture sensing IC to work according to a received trigger signal sent from the outside to acquire humiture data, and then the humiture data is processed and sent to the storage IC to be stored; the data export circuit is connected with storage IC and master control IC respectively, receives data export order at master control IC, and the connection of switch-on data export circuit and storage IC is through the circuit of a plurality of IC chips of integration on a module to improve the integrated level of humiture record appearance circuit board structure, compare in the design of many circuit boards among the prior art, its volume can further reduce, provides probably for realizing the product miniaturization.
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 view of a small-sized temperature and humidity recorder according to the present invention;
FIG. 2 is a schematic circuit diagram of a memory IC according to the present invention;
FIG. 3 is a schematic diagram of a data deriving circuit according to the present invention;
FIG. 4 is a schematic diagram of a power supply circuit according to the present invention;
FIG. 5 is a schematic diagram of a circuit structure of the temperature and humidity sensor IC according to the present invention;
FIG. 6 is a schematic diagram of another structure of a master IC according to the present invention;
fig. 7 is a schematic structural diagram of an antenna 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 small-sized humiture recorder, please refer to fig. 1, the small-sized humiture recorder includes:
the temperature and humidity acquisition module 110, the data export circuit 120 and the power supply circuit 130, wherein the temperature and humidity acquisition module 110 is formed by designing a basic driving circuit based on a highly integrated IC with a Bluetooth function and a data processing function, and the power supply circuit 130 is connected with the temperature and humidity acquisition module 110 and the data export circuit 120 and provides working voltage for the temperature and humidity acquisition module 110 and the data export circuit 120.
In this embodiment, the temperature and humidity acquisition module 110 is in communication connection with the data export circuit 120, and after receiving the data export command, the data export circuit 120 is connected in communication connection with the temperature and humidity acquisition module 110, and reads temperature and humidity data stored in the temperature and humidity acquisition module 110, and generates and exports a data report.
The temperature and humidity acquisition module 110 comprises a main control IC111, a temperature and humidity sensing IC112 and a storage IC113, wherein the temperature and humidity sensing IC112 and the storage IC113 are both connected with the main control IC111, the temperature and humidity sensing IC112 acquires temperature and humidity data in real time under the control of the main control IC111 and sends the acquired temperature and humidity data to the main control IC111 or the storage IC113 for storage, and when the data export circuit 120 receives an export instruction or detects that the storage device is accessed, the corresponding temperature and humidity data is read from the main control IC111 or the storage IC113 to generate a report and store the report to the storage device.
In this embodiment, the main control IC111 is further provided with at least one set of SPI interface 1111 and at least one set of I2C interface 1112, the data derivation circuit 120 is connected to the storage IC113, and is connected to the main control IC111 through the I2C interface 1112, and the temperature and humidity sensing IC112 is connected to the main control IC111 through the SPI interface 1111.
In this embodiment, the master IC111 is further provided with a CS interface, an SCLK interface, an SI interface, an SO interface, an SCL interface, and an SDA interface, where the CS interface, the SCLK interface, the SI interface, and the SO interface are connected to the storage IC, and the SCL interface and the SDA interface are connected to the temperature and humidity sensing IC 112.
Further, the temperature and humidity acquisition module 110 further includes a pull-up resistor R9 and two bypass capacitors C20 and C21, one end of the two bypass capacitors C20 and C21 after being connected in parallel is connected to the positive output end of the storage IC113 and the positive output end of the power circuit 130, and the other end is connected to the ground of the power circuit 130; one end of the pull-up resistor R9 is connected to the CS interface, and the other end is connected to the positive output terminal of the power circuit 130, as shown in fig. 2.
In this embodiment, in order to ensure stable operation of each IC in the temperature and humidity acquisition module 110, the temperature and humidity acquisition module further includes a basic driving circuit group, and the basic driving circuit group is respectively connected to the main control IC111, the temperature and humidity sensing IC112, and the storage IC113, and is used for maintaining the control potential of each IC at the most connected value when the temperature and humidity acquisition module is powered on.
In practical applications, the basic driving circuit group is formed by connecting a plurality of resistors, capacitors and inductors, for example, a filter circuit formed by connecting a potential forcing resistor and a coupling capacitor in series or in parallel, a filter circuit formed by connecting an inductor and a coupling capacitor in series or in parallel, a single capacitor and resistor are arranged to form a clamping circuit of a potential, and the circuits are connected with driving pins in a corresponding IC to realize clamping processing of the potential.
In this embodiment, the data deriving circuit 120 includes at least one of a USB communication circuit and a near field communication circuit, and if the data deriving circuit 120 is a USB communication circuit, it includes a USB connector U3, a voltage dividing circuit (R10 and R13), two current limiting resistors (R7 and R8), and a voltage dropping circuit (for example, a circuit formed by connecting D3, D4, and R12 in series in the figure), as shown in fig. 3, the voltage dividing circuit in the data deriving circuit 120 is used for monitoring whether to connect to a USB HOST, and it is connected to a first pin of the USB connector U3 and then grounded;
the voltage reduction circuit is used for reducing the voltage provided by the USB HOST to a voltage at which the master IC111 can operate, and is connected to the first pin of the USB connector U3 and then connected to the positive output terminal of the power supply circuit 130;
the first ends of the two current limiting resistors are respectively arranged on the second pin and the third pin in the USB connector U3, and the second ends of the two current limiting resistors are connected with the main control IC111 and are mainly used for protecting chip USB interfaces D +, D-.
In practical application, the voltage dividing circuit is composed of two resistors R10 and R13 connected in series, wherein a common connection end of the resistors 10 and R13 is connected with the SPI interface 1111 of the main control IC111, so that the main control IC111 detects whether the USB connector U3 is connected to a storage device, that is, a USB HOST, through the SPI interface 1111, and if the USB connector U3 is connected to the storage device, temperature and humidity data are read from the main control IC111 or the storage IC 112.
The voltage reduction circuit is composed of two diodes D4 and D3 and a resistor R12, and reduces 5V provided by the USB HOST to a voltage at which the main control IC111 can operate.
Further, a light emitting diode is further arranged on the voltage reduction circuit, and the master control IC111 is prompted by the light emitting diode to detect whether the USB connector U3 is connected to a storage device through the SPI interface 1111.
In this embodiment, the power circuits 130 are implemented by connecting capacitors in parallel. In addition, as shown in fig. 4, the power circuit 130 may further include a charging chip U9 with 5 pins, an auxiliary device (i.e., C27 and R15 in the drawing), and a USB interface (not shown in the drawing), where the USB interface is specifically an interface formed by +5V and ground in the drawing, in practical applications, the charging chip U9 is a semiconductor chip with model LTC4054ES5-4.2, and includes 5 connection pins, the second connection pin and the fourth connection pin of the charging chip U9 are respectively connected to a negative electrode and a positive electrode of the USB interface, the USB interface is an interface device with a common specification, the positive electrode and the negative electrode of the USB interface are generally two pins at the edge of the USB interface, and the auxiliary device is connected to the fifth connection pin of the charging chip U9 and then connected to the positive electrode and the negative electrode of the USB interface.
Furthermore, the charging circuit further comprises a display circuit, one end of the display circuit is connected with the first connecting pin of the charging chip U9, and the other end of the display circuit is connected with the anode of the USB interface.
In this embodiment, in order to further improve the accuracy of acquiring the temperature and humidity data, the temperature and humidity acquisition module 110 further includes three resistors and two capacitors, wherein a first pin and a sixth pin of the temperature and humidity sensing IC112 are respectively connected to an SCL interface and an SDA interface in the main control IC111, and a second pin and a fourth pin of the temperature and humidity sensing IC112 are grounded;
first connecting ends of the three resistors are connected with a data acquisition pin of the main control IC111 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 sensing IC 112;
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 sensing IC 112.
As shown in fig. 5, three resistors (R6, R5, and R4 in the figure, respectively), two capacitors (C22, C23 in the figure, respectively), and a temperature and humidity sensing IC112 (U2 in the figure), in practical applications, the temperature and humidity sensing IC112 is implemented by using a sensor with a model number STH30, the temperature and humidity sensing IC112 includes 6 pins, a first pin and a sixth pin of the temperature and humidity sensing IC112 are sequentially connected to a first data pin and a first control pin (i.e., pins corresponding to an SCL tag and two SDA tags in the figure) in the main control IC111, the temperature and humidity sensing IC112 transmits to the main control IC111 through a connection line of the first pin and the sixth pin after detecting temperature and humidity data in an environment, and a second pin and a fourth pin of the temperature and humidity sensing IC112 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 main control IC111, the second connection ends of the three resistors R4, R6, and R5 are sequentially connected to the first pin, the third pin, and the sixth pin of the temperature and humidity sensing IC112, and the fifth pin of the temperature and humidity sensing IC112 is short-circuited to the first connection ends of the three resistors R6, R5, and R4.
In this embodiment, the two capacitors C22 and C23 are connected in parallel, the two pins after being connected in parallel are sequentially connected to the first connection end of the resistor and the ground, that is, the first connection ends of the two capacitors C22 and C23 are connected to the first connection end of the resistor, and the second connection end after being connected in parallel is connected to the fourth pin of the temperature and humidity sensing IC112 and is grounded.
In practical application, when the temperature precision acquired by the small-sized temperature and humidity recorder is required to be designed to be higher, the temperature and humidity sensing IC112 can be replaced by a temperature sensor chip, and the collection of humidity data is realized by using the main control IC111, the temperature sensor chip is provided with 7 pins, a first pin and a sixth pin of the temperature sensor chip are sequentially connected with a second data pin and a second control pin in the main control IC111, in practical applications, the second data pin and the second control pin are implemented by selecting an SPI interface in the main control IC111, the second pin of the temperature sensor chip is grounded, the connection relationship of the other pins with the three resistors R6, R5 and R4 and the two capacitors C22 and C23 described above is the same as that of the temperature sensor chip, it is not described here, and preferably, the temperature and humidity sensor chip selects a sensor with model number of TMP 112/102.
In this embodiment, as shown in fig. 6, the small-sized temperature and humidity recorder further includes an antenna circuit 140 and a crystal oscillator circuit 150, where the antenna circuit 140 and the crystal oscillator circuit 150 are disposed on the main control IC111 and integrated with the main control IC 111. In practical applications, the antenna circuit 140 and the crystal oscillator circuit 150 are integrated by using SIP technology, so that the overall circuit and the area of the PCB board are reduced.
In this embodiment, the main control IC111 adopts a single chip microcomputer with an M0 core, and simultaneously, the antenna circuit 140 is integrated in a logic circuit position of a bluetooth function in the single chip microcomputer through an SIP technique, the antenna circuit 140 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, the LC filter circuit includes a first inductor L2 and a first capacitor C1 which are sequentially connected in series, a first input end a is arranged at one end of the first inductor L2, which is connected to the first capacitor C1, a second input end B and a second capacitor C5 are arranged at one end of the first inductor L2, which is not connected to the first capacitor C1, and the second capacitor C5 is connected to ground. The first input terminal a and the second input terminal B are respectively connected to the antenna pins in the integrated chip 10, as shown in fig. 7.
The impedance matching circuit is a pi-shaped circuit and comprises a third capacitor C3, a second inductor L1 and a fourth capacitor C4 which are connected in series; one end of the third capacitor C3 connected with the second inductor L1 is connected with the coupling capacitor C2, and the other end of the third capacitor C3 is grounded; one end of the fourth capacitor C4 connected to the second inductor L1 is connected to the first resistor R17, and the other end of the fourth capacitor C4 is grounded.
In this embodiment, this small-size humiture record appearance still includes the low temperature protection circuit, the humiture record appearance can have the difference to the work control of low temperature protection circuit under dormancy and awaken up state, this low temperature protection circuit and power supply circuit 130 parallel connection, under the low temperature environment, the internal resistance of power supply circuit 130 can become very big, lead to the output voltage step-down of power supply circuit 130, the operating current is less, can't satisfy the operational requirement of humiture record appearance, but the undercurrent can charge power supply circuit 130, the low temperature protection circuit can discharge in the twinkling of an eye after the record appearance awakens up, provide the electric current that satisfies record appearance operational requirement.
In an embodiment of the present invention, the low-temperature protection circuit may also be configured as a circuit with a heating function, and the power supply circuit 130 may be kept to operate in a certain temperature environment in real time by heating, and certainly, the power supply circuit 50 may also be heated in a short time when the recorder wakes up.
In this embodiment, since the small-sized humiture recorder has two working states, the first and second crystal oscillator circuits, the first crystal oscillator circuit is a function of the main control IC111, that is, controls the working of the humiture recorder; the second crystal oscillator circuit is connected with an SPI interface in the master control IC 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 small-sized 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 main control IC, and similarly, the pin header or the USB interface is also extended in two pins, namely RST pin and SWS pin, in the main control IC, 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.
Through the implementation of the small-size humiture recording instrument that provides, through the integrated mode of module with master control IC, sensor IC and storage IC's circuit design on a module to sensor module and storage module among the prior art are replaced to this module, with the whole design volume that reduces humiture recording instrument.
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 (10)
1. The utility model provides a small-size humiture record appearance, its characterized in that, small-size humiture record appearance includes: the temperature and humidity acquisition circuit comprises a temperature and humidity acquisition module, a data export circuit and a power circuit, wherein the power circuit is used for providing working voltage for the temperature and humidity acquisition module and the data export circuit;
the temperature and humidity acquisition module comprises a main control IC, a temperature and humidity sensing IC and a storage IC which are provided with at least one group of SPI interfaces and at least one group of I2C interfaces, and a basic drive circuit group which is simultaneously connected with the main control IC, the sensing IC and the storage IC;
the temperature and humidity sensing IC is connected with the SPI interface, the storage IC is connected with the I2C interface, and the data deriving circuit is electrically connected with the main control IC through the SPI interface and is connected with the storage IC.
2. The miniature humiture recorder according to claim 1, wherein the data deriving circuit comprises a USB connector with 4 pins, a voltage dividing circuit, two current limiting resistors and a voltage dropping circuit;
the voltage division circuit is connected with a first pin in the USB connector and then grounded;
the voltage reduction circuit is connected with a first pin in the USB connector and then connected with a positive output end of the power supply circuit;
the first ends of the two current-limiting resistors are respectively arranged on the second pin and the third pin in the USB joint, and the second ends of the two current-limiting resistors are connected with the master control IC.
3. The small-sized temperature and humidity recorder according to claim 2, wherein the master control IC is further provided with a CS interface, an SCLK interface, an SI interface, an SO interface, an SCL interface, and an SDA interface, the CS interface, the SCLK interface, the SI interface, and the SO interface are connected to the storage IC, and the SCL interface and the SDA interface are connected to the temperature and humidity sensing IC.
4. The miniature temperature and humidity recorder according to claim 3, wherein the temperature and humidity acquisition module further comprises a pull-up resistor and two bypass capacitors, one end of the two bypass capacitors after being connected in parallel is simultaneously connected with the positive output ends of the storage IC and the power circuit, and the other end of the two bypass capacitors is connected with the ground of the power circuit; one end of the pull-up resistor is connected with the CS interface, and the other end of the pull-up resistor is connected with the positive output end of the power circuit.
5. The small-sized temperature and humidity recorder according to claim 3, wherein the temperature and humidity acquisition module further comprises three resistors and two capacitors, wherein a first pin and a sixth pin of the temperature and humidity sensing IC are respectively connected with an SCL interface and an SDA interface in the main control IC, and a second pin and a fourth pin of the temperature and humidity sensing IC are grounded;
first connecting ends of the three resistors are connected with a data acquisition pin of the master control IC 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 sensing IC;
and a first connecting end of the two capacitors after being connected in parallel is connected with a first connecting end of the resistor, and a second connecting end of the two capacitors after being connected in parallel is connected with a fourth pin of the temperature and humidity sensing IC.
6. The miniature temperature and humidity recorder according to any one of claims 1-5, wherein the master control IC is a single chip microcomputer with an M0 core.
7. The small temperature and humidity recorder according to claim 6, further comprising an antenna circuit and a crystal oscillator circuit, wherein the antenna circuit and the crystal oscillator circuit are disposed on the main control IC and integrated with the main control IC.
8. The miniature temperature and humidity recorder according to claim 7, wherein the antenna circuit comprises an LC filter circuit, an impedance matching circuit, a coupling capacitor, a first resistor and an antenna which are connected in sequence; one end of the impedance matching circuit is connected with one end of the coupling capacitor, the other end of the coupling capacitor is connected with one end of the LC filter circuit, and the other end of the impedance matching circuit is connected with the first resistor.
9. The compact temperature and humidity recorder of claim 6, further comprising a low temperature protection circuit connected in parallel with the power circuit;
if the small temperature and humidity recorder is in a dormant state, the power circuit charges the low-temperature protection circuit;
and if the small temperature and humidity recorder is in an awakening state, the low-temperature protection circuit discharges electricity and provides working voltage for the temperature and humidity sensing IC together with the power circuit.
10. The small-sized humiture recorder according to claim 9, further comprising a second oscillator circuit connected to the SPI interface in the main control IC for outputting a pulse signal to control the humiture sensing IC to switch to a low power consumption state when the small-sized humiture recorder is in a sleep state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122531496.3U CN216206600U (en) | 2021-10-20 | 2021-10-20 | Small-sized humiture recorder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122531496.3U CN216206600U (en) | 2021-10-20 | 2021-10-20 | Small-sized humiture recorder |
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| CN216206600U true CN216206600U (en) | 2022-04-05 |
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| CN202122531496.3U Active CN216206600U (en) | 2021-10-20 | 2021-10-20 | Small-sized humiture recorder |
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