Pressure and temperature dual-voltage acquisition circuit and device

Abstract

The utility model belongs to the field of power electronic devices, and discloses a pressure and temperature dual-voltage acquisition circuit and device, which comprises a temperature and voltage acquisition circuit, a pressure and voltage acquisition circuit, a working circuit and an MT360 chip, the temperature voltage acquisition circuit comprises a resistance temperature sensor, and a pull-up resistor R7 and a pull-down resistor R10 which are connected with the resistance temperature sensor; the part, connected with the pull-up resistor R7, of the resistance temperature sensor is connected with the positive end of a first ADC port of the MT360, and the part, connected with the pull-down resistor R10, of the resistance temperature sensor is connected with the negative end of the first ADC port of the MT360; the positive end output of the pressure and voltage acquisition circuit is connected with the positive end of a second ADC port of the MT360 chip, and the negative end output of the pressure and voltage acquisition circuit is connected with the negative end of the second ADC port of the MT360 chip; and the working circuit is connected with the MT360 chip and is used for maintaining the normal operation of the MT360 chip. Two-way pressure and temperature voltage acquisition can be more flexible and convenient, meanwhile, the working efficiency is improved, the size is reduced, and energy consumption is remarkably reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of power electronic devices, and relates to a pressure and temperature double-voltage acquisition circuit and device. BACKGROUND

[0002] Voltage acquisition technology plays a crucial role in electronic measurement devices, serving as a bridge between the analog and digital worlds, enabling precise signal conversion and transmission. Whether in industrial automation, environmental monitoring, medical devices, consumer electronics, or other fields, voltage acquisition technology is indispensable. It ensures that analog signals obtained from sensors are accurately converted into digital signals, which are then recognized and processed by processors, providing a solid foundation for device operation and data analysis.

[0003] In pressure and temperature double-voltage acquisition applications, there are high requirements for data acquisition accuracy and processing capacity. However, a single MCU (microcontroller) or ADC (analog-to-digital converter) often cannot meet these needs. While MCUs have strong control capabilities, they have obvious shortcomings in high-precision data acquisition. Their built-in ADCs usually have limited precision, making it difficult to meet the requirements for accurate measurement of physical quantities such as pressure and temperature. While a single ADC can provide high-precision data acquisition, it is not sufficient in data processing and communication. It cannot independently perform filtering, calibration, and transmission of collected data, and needs to be used in conjunction with an MCU to achieve complete functionality.

[0004] Therefore, in practical applications, a combination of MCU and ADC is usually used to achieve pressure and temperature double-voltage acquisition. This combination combines the control capabilities of MCUs and the high-precision data acquisition advantages of ADCs, and can better meet application requirements. However, this combination also brings new problems: low integration. Since MCU and ADC are two independent chips, their connection and communication require additional space and resources, resulting in a larger overall device size. Meanwhile, the simultaneous operation of two chips also leads to high power consumption, which is not conducive to long-term operation and energy saving of the device. In addition, the combination of MCU and ADC has certain complexity in design and production, and there are issues such as compatibility between chips, stability of signal transmission, and power management to ensure the reliability and stability of the entire system. SUMMARY

[0005] The utility model aims at overcoming the above-mentioned prior art defects, and provides a pressure and temperature double-voltage acquisition circuit and device.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0007] The utility model discloses a first aspect provides a kind of pressure and temperature double voltage acquisition circuit, including temperature voltage acquisition circuit, pressure voltage acquisition circuit, working circuit and MT360 chip;Temperature voltage acquisition circuit includes resistance temperature sensor and the pull-up resistance R7 and pull-down resistance R10 connected with resistance temperature sensor;Resistance temperature sensor one end is pulled up to predetermined voltage by pull-up resistance R7, and the other end is pulled down to ground by pull-down resistance R10;The part of resistance temperature sensor and pull-up resistance R7 connection is connected with the positive terminal of the first ADC port of MT360, and the part of resistance temperature sensor and pull-down resistance R10 connection is connected with the negative terminal of the first ADC port of MT360;The positive terminal output of pressure voltage acquisition circuit is connected with the positive terminal of the second ADC port of MT360 chip, and the negative terminal output is connected with the negative terminal of the second ADC port of MT360 chip;The working circuit is connected with MT360 chip, for maintaining the normal operation of MT360 chip.

[0008] Optionally, the temperature voltage acquisition circuit further includes resistance R1, capacitor C4, resistance R3 and capacitor C10; the part of resistance temperature sensor and pull-up resistance R7 connection is connected with the positive terminal of the first ADC port of MT360 by resistance R1, and the part of resistance R1 and the positive terminal of the first ADC port of MT360 connection is connected with one end of capacitor C4, and the other end of capacitor C4 is grounded; the part of resistance temperature sensor and pull-down resistance R10 connection is connected with the negative terminal of the first ADC port of MT360 by resistance R3, and the part of resistance R3 and the negative terminal of the first ADC port of MT360 connection is connected with one end of capacitor C10, and the other end of capacitor C10 is grounded.

[0009] Optionally, the resistance temperature sensor is a platinum resistance temperature sensor.

[0010] Optionally, the pressure voltage acquisition circuit includes bridge R4.

[0011] Optionally, the pressure voltage acquisition circuit further includes resistance R2, capacitor C6, resistance R8 and capacitor C11; the positive terminal output of bridge R4 is connected with the positive terminal of the second ADC port of MT360 chip by resistance R2, and the part of resistance R2 and the positive terminal of the second ADC port of MT360 chip connection is connected with one end of capacitor C6, and the other end of capacitor C6 is grounded; the negative terminal output of bridge R4 is connected with the negative terminal of the second ADC port of MT360 chip by resistance R8, and the part of resistance R8 and the negative terminal of the second ADC port of MT360 chip connection is connected with one end of capacitor C11, and the other end of capacitor C11 is grounded.

[0012] Optionally, the working circuit includes resistance R5; resistance R5 is connected with the reference current setting pin of the excitation current source of MT360 chip;And the temperature drift of resistance R5 is less than 5ppm / ℃.

[0013] Optionally, the working circuit comprises a crystal oscillator Y1, a capacitor C7 and a capacitor C8; one end of the crystal oscillator Y1 is connected with an external crystal oscillator input end of the MT360 chip and one end of the capacitor C8, and the other end of the capacitor C8 is grounded; the other end of the crystal oscillator Y1 is connected with an external crystal oscillator output end of the MT360 chip and one end of the capacitor C7, and the other end of the capacitor C7 is grounded.

[0014] Optionally, the working circuit comprises a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C5, a capacitor C9, a capacitor C12, a capacitor C13, a capacitor C14 and a capacitor C15; one end of the capacitor C1 is connected to a RESET pin of the MT360 chip, and the other end is grounded; one end of the capacitor C2 is connected to a first IOVDD pin of the MT360 chip, and the other end is grounded; one end of the capacitor C9 is connected to a second IOVDD pin of the MT360 chip, and the other end is grounded; the capacitor C3 and the capacitor C5 are connected to an internal analog voltage stabilizer power output and an internal digital voltage stabilizer power output of the MT360 chip respectively; the capacitor C12 is connected across an external reference voltage of the MT360 chip; the capacitor C13 and the capacitor C14 are connected in parallel, one end of which is connected to an AVDD analog system power pin of the MT360 chip, and the other end is grounded; one end of the capacitor C15 is connected to an INT_REF pin of the MT360 chip, and the other end is grounded.

[0015] Optionally, the digital ground of the MT360 chip is separated from the analog ground.

[0016] The utility model discloses a second aspect provides a pressure and temperature dual voltage acquisition device, including the encapsulation, the encapsulation in package has above-mentioned pressure and temperature dual voltage acquisition circuit.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The pressure and temperature dual voltage acquisition circuit of the utility model is based on the MT360 chip of MCU chip and high-precision ADC chip two-in-one, combines the temperature voltage acquisition circuit and pressure voltage acquisition circuit of innovative design, and converts temperature signal and pressure signal into voltage signal through the temperature voltage acquisition circuit and pressure voltage acquisition circuit respectively, and works independently, and does not interfere with each other, ensures the flexibility and accuracy of dual acquisition, and can make dual pressure, temperature voltage acquisition more flexible and convenient, improves work efficiency while guaranteeing acquisition accuracy. Moreover, the internal high-precision ADC chip of MT360 chip is used for acquisition, and the realization is simple and fast, and is especially suitable for the scene needing to carry out pressure and temperature high-precision acquisition simultaneously. At the same time, the volume is greatly reduced, so that it is more small and portable, and the energy consumption is also reduced significantly. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1The working circuit of the utility model is connected with the topology graph of MT360 chip.

[0020] Fig. 2 The temperature voltage acquisition circuit topology graph of the utility model.

[0021] Fig. 3 The pressure voltage acquisition circuit topology graph of the utility model. DETAILED DESCRIPTION

[0022] In order to make the personnel in the technical field better understand the utility model scheme, the technical scheme in the embodiment of the utility model will be clearly and completely described below in combination with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, rather than all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skilled in the art without making creative labor should belong to the protection scope of the utility model.

[0023] It should be noted that, in the description of the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "setting" should be understood broadly, for example, it can be fixedly connected, set, or detachably connected, set, or integrally connected, set. The terms "including" and "having" and any variants thereof are intended to cover non-exclusive inclusion. The above terms in the utility model can be understood according to the specific meaning by the ordinary skilled in the art.

[0024] The utility model will be described in further detail below in combination with the drawings:

[0025] Referring to Figs. 1 to 3 In an embodiment of the utility model, a pressure and temperature double voltage acquisition circuit is provided, which comprises a temperature voltage acquisition circuit, a pressure voltage acquisition circuit, a working circuit and an MT360 chip.

[0026] The temperature voltage acquisition circuit comprises a resistance temperature sensor, an upper pull resistor R7 and a lower pull resistor R10 connected with the resistance temperature sensor; one end of the resistance temperature sensor is pulled up to a predetermined voltage through the upper pull resistor R7, and the other end is pulled down to the ground through the lower pull resistor R10; the part of the resistance temperature sensor connected with the upper pull resistor R7 is connected with the positive terminal of the first ADC port of the MT360, and the part of the resistance temperature sensor connected with the lower pull resistor R10 is connected with the negative terminal of the first ADC port of the MT360; the positive terminal output of the pressure voltage acquisition circuit is connected with the positive terminal of the second ADC port of the MT360 chip, and the negative terminal output is connected with the negative terminal of the second ADC port of the MT360 chip; the working circuit is connected with the MT360 chip and is used for maintaining the normal operation of the MT360 chip.

[0027] Explanatorily, the MT360 chip is an integrated ADC chip and an ARM Cortex-M3 microcontroller of Xi'an Space Civil Chip Technology Co., Ltd., which is equivalent to integrating the MCU and the high-precision ADC on a single chip, and has been sold as a mature commercial chip product. The utility model only relates to the application of the MT360 chip and the specific design of the temperature voltage acquisition circuit, the pressure voltage acquisition circuit and the working circuit, and does not involve the improvement of the internal control program of the MT360 chip.

[0028] The utility model discloses a pressure and temperature double voltage acquisition circuit, which is based on the MT360 chip integrating the MCU chip and the high-precision ADC chip, and combines the temperature voltage acquisition circuit and the pressure voltage acquisition circuit designed innovatively. The temperature voltage acquisition circuit and the pressure voltage acquisition circuit respectively convert the temperature signal and the pressure signal into voltage signals, work independently and do not interfere with each other, ensuring the flexibility and accuracy of double-channel acquisition, and making the double-channel pressure and temperature voltage acquisition more flexible and convenient, improving the working efficiency while ensuring the acquisition accuracy. Moreover, the acquisition is simple and fast through the internal high-precision ADC chip of the MT360 chip, which is especially suitable for scenes requiring simultaneous pressure and temperature high-precision acquisition. At the same time, the volume is greatly reduced, making it more compact and portable, and the energy consumption is also significantly reduced.

[0029] In a possible implementation, the temperature voltage acquisition circuit further includes a resistor R1, a capacitor C4, a resistor R3 and a capacitor C10.

[0030] Specifically, the part of the resistance temperature sensor connected with the pull-up resistor R7 is connected with the positive terminal of the first ADC port of the MT360 through the resistor R1, the part of the resistor R1 connected with the positive terminal of the first ADC port of the MT360 is connected with one end of the capacitor C4, and the other end of the capacitor C4 is grounded; the part of the resistance temperature sensor connected with the pull-down resistor R10 is connected with the negative terminal of the first ADC port of the MT360 through the resistor R3, the part of the resistor R3 connected with the negative terminal of the first ADC port of the MT360 is connected with one end of the capacitor C10, and the other end of the capacitor C10 is grounded.

[0031] Explanatorily, the pull-up resistor R7 and the pull-down resistor R10 are used on both sides of the resistance temperature sensor, and cooperate with the resistance temperature sensor to convert the temperature signal into a voltage signal input to the MT360 chip.

[0032] Exemplarily, the resistance temperature sensor is a platinum resistance temperature sensor, which can be a platinum resistance temperature sensor PT2000. The platinum resistance temperature sensor converts the temperature signal into a resistance value signal, and then the pull-up resistor R7 and the pull-down resistor R10 are used to obtain a voltage signal that can be acquired.

[0033] Explanatorily, the resistance R1, the capacitor C4, the resistance R3 and the capacitor C10 perform RC filtering function on the port of the MT360 chip to which the voltage signal is inputted, so as to make the collected voltage signal more stable.

[0034] In a possible implementation, the pressure voltage collection circuit comprises a bridge R4.

[0035] Explanatorily, the bridge R4, as a main component of the pressure voltage collection circuit, can convert the collected pressure signal into a voltage signal and output the voltage signal.

[0036] In a possible implementation, the pressure voltage collection circuit further comprises a resistance R2, a capacitor C6, a resistance R8 and a capacitor C11; the positive terminal output of the bridge R4 is connected to the positive terminal of the second ADC port of the MT360 chip through the resistance R2, the part of the resistance R2 connected to the positive terminal of the second ADC port of the MT360 chip is connected to one end of the capacitor C6, and the other end of the capacitor C6 is grounded; the negative terminal output of the bridge R4 is connected to the negative terminal of the second ADC port of the MT360 chip through the resistance R8, the part of the resistance R8 connected to the negative terminal of the second ADC port of the MT360 chip is connected to one end of the capacitor C11, and the other end of the capacitor C11 is grounded.

[0037] Explanatorily, the resistance R2, the capacitor C6, the resistance R8 and the capacitor C11 perform RC filtering function on the port of the MT360 chip to which the voltage signal is inputted, so as to make the collected voltage signal more stable.

[0038] In a possible implementation, the working circuit comprises a resistance R5; the resistance R5 is connected to the reference current setting pin of the excitation current source of the MT360 chip; and the temperature drift of the resistance R5 is less than 5ppm / ℃.

[0039] Explanatorily, the resistance R5 is used as the reference current resistance of the excitation current source, and functions to set the reference current of the excitation current source through an external resistance. This design allows the output current of the excitation current source to be accurately controlled by adjusting the resistance value of the resistance R5, so as to meet the requirements of different applications.

[0040] In a possible implementation, the working circuit comprises a crystal oscillator Y1, a capacitor C7 and a capacitor C8; one end of the crystal oscillator Y1 is connected to the external crystal oscillator input end of the MT360 chip and one end of the capacitor C8, and the other end of the capacitor C8 is grounded; the other end of the crystal oscillator Y1 is connected to the external crystal oscillator output end of the MT360 chip and one end of the capacitor C7, and the other end of the capacitor C7 is grounded.

[0041] Explanatorily, the crystal oscillator Y1 provides an external clock source for the MT360 chip, so that the device is not susceptible to external environmental interference, affecting the main frequency and other functional use. The capacitor C7 and the capacitor C8 are mainly used for resonance capacitor at both ends of the crystal oscillator Y1, and the role is to make the equivalent capacitance at both ends of the crystal oscillator Y1 equal to or close to the load capacitance.

[0042] In a possible implementation, the working circuit includes the capacitor C1, the capacitor C2, the capacitor C3, the capacitor C5, the capacitor C9, the capacitor C12, the capacitor C13, the capacitor C14 and the capacitor C15.

[0043] One end of the capacitor C1 is connected to the RESET pin of the MT360 chip, and the other end is grounded; one end of the capacitor C2 is connected to the first IOVDD pin of the MT360 chip, and the other end is grounded; one end of the capacitor C9 is connected to the second IOVDD pin of the MT360 chip, and the other end is grounded; the capacitor C3 and the capacitor C5 are connected to the internal analog voltage regulator power output and the internal digital voltage regulator power output of the MT360 chip to the ground respectively; the capacitor C12 is connected between the external reference voltage of the MT360 chip; the capacitor C13 and the capacitor C14 are connected in parallel, one end of which is connected to the AVDD analog system power pin of the MT360 chip, and the other end is grounded; one end of the capacitor C15 is connected to the INT_REF pin of the MT360 chip, and the other end is grounded.

[0044] Explanatorily, the capacitor C1, the capacitor C2, the capacitor C3, the capacitor C5, the capacitor C9, the capacitor C12, the capacitor C13, the capacitor C14 and the capacitor C15 are mainly used for decoupling or filtering, for buffering voltage, preventing spikes and drops, and connected to the ground from the power supply end or the pin end.

[0045] Specifically, the capacitor C1 is a 100 nf capacitor, one end of which is connected to the RESET pin of the MT360 chip, and the other end of which is grounded, for use as a filter capacitor, to ensure that the RESET pin of the MT360 chip can be reliably reset when pulled low. The capacitor C2 and the capacitor C9 are 100 nf capacitors, one end of each of which is connected to the IOVDD pin of the MT360 chip, and the other end of each of which is grounded, for use as a filter capacitor, to ensure stable power supply for the digital power supply of the MT360 chip. The capacitor C3 and the capacitor C5 are 0.47 uf capacitors, which are respectively connected to the output of an internal analog voltage regulator and the output of an internal digital voltage regulator to ground, to ensure that the chip can work normally. The capacitor C12 is a 47 uf capacitor, which is connected between the external reference voltages VREF+ and VREF- for filtering the external reference voltages. The capacitor C13 and the capacitor C14 are respectively 10 uf and 0.1 uf capacitors, which are connected in parallel, one end of each of which is connected to the AVDD analog system power supply pin of the MT360 chip, and the other end of each of which is grounded, for use as a filter capacitor, to ensure stable power supply for the analog power supply of the MT360 chip. The capacitor C15 is a 0.1 uf decoupling capacitor, one end of which is connected to the INT_REF pin of the MT360 chip, and the other end of which is grounded, to remove the coupling interference of other signals on the internal reference voltage source.

[0046] In a possible implementation, the digital ground of the MT360 chip is separated from the analog ground for copper cladding.

[0047] Illustratively, there are both digital signals and analog signals between the boards, the digital ground is separated from the analog ground for copper cladding, the analog ground is laid near the voltage input acquisition channel, the digital ground is laid in other digital module areas, and finally connected through a 0Ω resistor, to ensure that the voltages of the digital module and the analog module are stable and do not interfere with each other.

[0048] Illustratively, in the temperature voltage acquisition circuit and the pressure voltage acquisition circuit, the bridge R4 and the resistance temperature sensor and the peripheral circuit respectively convert the pressure signal and the temperature signal into a voltage signal, which is then acquired by the internal high-precision ADC of the MT360 chip, and the acquired voltage value and the corresponding relationship between the pressure and the temperature can be obtained by processing the existing software burned in the MT360 chip, and then the measured pressure value and the temperature can be directly output, which is simple and fast, and is particularly suitable for scenes that require high-precision acquisition of pressure and temperature at the same time.

[0049] Exemplarily, the bridge R4 and the platinum resistance temperature sensor are powered by the same 5V power supply, and after power-on, the bridge R4 can actively convert the pressure signal into a voltage signal and output; after power-on, the platinum resistance temperature sensor can convert the temperature signal into a resistance value signal, and then the external pull-up resistor R7 and the pull-down resistor R10 convert the resistance signal into a voltage signal, and the two voltage signals are simultaneously connected to the two ADC ports of the MT360 chip for analog-digital conversion to realize dual-channel acquisition of the temperature voltage and the pressure voltage.

[0050] The MT360 chip is powered by 5V, in order to ensure the normal function of the circuit, the amplitude of the power supply ripple is limited to within ±5% of the supply voltage, and within this range, the MT360 chip function can ensure normal work, therefore, a filter capacitor is added between the VDD and VSS of the MT360 chip to reduce the power supply ripple.

[0051] The crystal oscillator Y1 is an external high-speed crystal oscillator of 12MHz, which is matched with a 12pf starting capacitor, and after frequency multiplication by PLL, a relatively stable clock source is provided for the normal work of the MT360 chip.

[0052] The bridge R4 is powered by 5V, and the output signal voltage of the bridge R4 will change with the voltage change, the upper end of the platinum resistance temperature sensor is pulled up to 5V through the pull-up resistor R7 of 10KΩ, and the lower end is pulled down to the ground through the pull-down resistor R10 of 10KΩ, and the resistance value will also change with the temperature change, and a corresponding pressure difference will also be generated at the upper and lower ends, and the voltage difference signal of the bridge R4 and the platinum resistance temperature sensor is input into the ADC port of the MT360 chip for acquisition. Before the voltage difference signal enters the ADC port, an RC filter of 500Ω resistor and 100pF capacitor is used for buffering voltage, preventing spikes and drops, avoiding measurement errors caused by ripple interference, so that the measured voltage data is more stable and reliable.

[0053] In another embodiment of the utility model, a pressure and temperature dual-voltage acquisition device is provided, comprising a packaging body; the packaging body is packaged with the above-mentioned pressure and temperature dual-voltage acquisition circuit.

[0054] Exemplarily, in the possible packaging mode, the pressure and temperature dual-voltage acquisition device can adopt surface mounting technology to integrate each component of the pressure and temperature dual-voltage acquisition circuit on a compact printed circuit board, and then use epoxy resin, silica gel and other packaging materials to seal the entire device in the packaging body by injection molding or potting process, so as to avoid the influence of external environment, and at the same time ensure good electrical performance and stability.

[0055] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, the scope of the present application being defined by the claims appended hereto rather than by the above description, and all the changes which fall within the meaning and the scope of the equivalent elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0056] Furthermore, it should be understood that although the present specification is described in terms of embodiments, not every embodiment according to the present specification needs to exhibit each and every characteristic specified in the present specification. The specification can also be described in terms of a single independent technical solution, but this does not mean that each embodiment only contains one independent technical solution. The specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by a person skilled in the art.

Claims

1. A pressure and temperature dual voltage acquisition circuit, characterized by, The temperature voltage acquisition circuit, the pressure voltage acquisition circuit, the working circuit and the MT360 chip are included. The temperature voltage acquisition circuit includes a resistance temperature sensor, a pull-up resistor R7 and a pull-down resistor R10 connected with the resistance temperature sensor; one end of the resistance temperature sensor is pulled up to a predetermined voltage through the pull-up resistor R7, and the other end is pulled down to the ground through the pull-down resistor R10; the part of the resistance temperature sensor connected with the pull-up resistor R7 is connected with the positive terminal of the first ADC port of the MT360, and the part of the resistance temperature sensor connected with the pull-down resistor R10 is connected with the negative terminal of the first ADC port of the MT360. The positive terminal output of the pressure voltage acquisition circuit is connected with the positive terminal of the second ADC port of the MT360 chip, and the negative terminal output is connected with the negative terminal of the second ADC port of the MT360 chip. The working circuit is connected with the MT360 chip and is used for maintaining the normal operation of the MT360 chip.

2. The pressure and temperature dual voltage acquisition circuit of claim 1, wherein, The temperature voltage acquisition circuit further includes a resistor R1, a capacitor C4, a resistor R3 and a capacitor C10. The part of the resistance temperature sensor connected with the pull-up resistor R7 is connected with the positive terminal of the first ADC port of the MT360 through the resistor R1, the part of the resistor R1 connected with the positive terminal of the first ADC port of the MT360 is connected with one end of the capacitor C4, and the other end of the capacitor C4 is connected with the ground; the part of the resistance temperature sensor connected with the pull-down resistor R10 is connected with the negative terminal of the first ADC port of the MT360 through the resistor R3, the part of the resistor R3 connected with the negative terminal of the first ADC port of the MT360 is connected with one end of the capacitor C10, and the other end of the capacitor C10 is connected with the ground.

3. The pressure and temperature dual voltage acquisition circuit of claim 1, wherein, The resistance temperature sensor is a platinum resistance temperature sensor.

4. The pressure and temperature dual voltage acquisition circuit of claim 1, wherein, The pressure voltage acquisition circuit includes a bridge R4.

5. The pressure and temperature dual voltage acquisition circuit of claim 3, wherein, The pressure voltage acquisition circuit further includes a resistor R2, a capacitor C6, a resistor R8 and a capacitor C11. The positive terminal output of the bridge R4 is connected with the positive terminal of the second ADC port of the MT360 chip through the resistor R2, the part of the resistor R2 connected with the positive terminal of the second ADC port of the MT360 chip is connected with one end of the capacitor C6, and the other end of the capacitor C6 is connected with the ground; the negative terminal output of the bridge R4 is connected with the negative terminal of the second ADC port of the MT360 chip through the resistor R8, the part of the resistor R8 connected with the negative terminal of the second ADC port of the MT360 chip is connected with one end of the capacitor C11, and the other end of the capacitor C11 is connected with the ground.

6. The pressure and temperature dual voltage acquisition circuit of claim 1, wherein, The working circuit includes a resistor R5; the resistor R5 is connected with the reference current setting pin of the excitation current source of the MT360 chip; and the temperature drift of the resistor R5 is less than 5ppm / ℃.

7. The pressure and temperature dual voltage acquisition circuit of claim 1, wherein, The working circuit includes a crystal oscillator Y1, a capacitor C7 and a capacitor C8. One end of the crystal oscillator Y1 is connected with the external crystal oscillator input end of the MT360 chip and one end of the capacitor C8, and the other end of the capacitor C8 is connected with the ground; the other end of the crystal oscillator Y1 is connected with the external crystal oscillator output end of the MT360 chip and one end of the capacitor C7, and the other end of the capacitor C7 is connected with the ground.

8. The pressure and temperature dual voltage acquisition circuit of claim 1, wherein, The working circuit comprises capacitors C1, C2, C3, C5, C9, C12, C13, C14 and C15; one end of the capacitor C1 is connected to the RESET pin of the MT360 chip, and the other end is grounded; one end of the capacitor C2 is connected to the first IOVDD pin of the MT360 chip, and the other end is grounded; one end of the capacitor C9 is connected to the second IOVDD pin of the MT360 chip, and the other end is grounded; the capacitors C3 and C5 are connected to the internal analog voltage stabilizer power output and the internal digital voltage stabilizer power output of the MT360 chip respectively; the capacitor C12 is connected across the external reference voltage of the MT360 chip; the capacitors C13 and C14 are connected in parallel, one end of which is connected to the AVDD analog system power pin of the MT360 chip, and the other end is grounded; one end of the capacitor C15 is connected to the INT_REF pin of the MT360 chip, and the other end is grounded.

9. The pressure and temperature dual voltage acquisition circuit of claim 1, wherein, The digital ground of the MT360 chip is separated from the analog ground by copper.

10. A pressure and temperature dual voltage acquisition device, characterized by, The package comprises the pressure and temperature dual-voltage acquisition circuit according to any one of claims 1 to 9.

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