CN204988565U - Capacitanc pressure transmitter - Google Patents
Capacitanc pressure transmitter Download PDFInfo
- Publication number
- CN204988565U CN204988565U CN201520677728.8U CN201520677728U CN204988565U CN 204988565 U CN204988565 U CN 204988565U CN 201520677728 U CN201520677728 U CN 201520677728U CN 204988565 U CN204988565 U CN 204988565U
- Authority
- CN
- China
- Prior art keywords
- integrated chip
- digital
- transducer
- current loop
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The utility model discloses a capacitanc pressure transmitter, including pressure sensor, NULL and electric current loop converter, pressure sensor with NULL connects, pressure sensor receive produce behind the pressure with the corresponding capacitance value of pressure conveys NULL, NULL conveys after converting analog voltage signal to electric current loop converter, electric current loop converter output with the corresponding electric current of pressure value that pressure sensor received. Compare and to purchase multiple part and carry out multiple part the mode of paster in prior art, the utility model discloses a NULL has saved the time to each spare part connected stick piece, has shortened production cycle, has also saved the cost greatly, has improved the reliability.
Description
Technical field
The utility model relates to pressure unit field, particularly relates to a kind of capacitance pressure transmitter.
Background technology
Pressure unit, as a kind of industrial conventional current loop transducer, is widely used in the fields such as water conservancy and hydropower, production automatic control, electric power.Capacitance pressure transmitter is because its measuring accuracy is high, good stability, measurement range are comparatively large and be subject to increasing application.Refer to Fig. 1, it is the work block diagram of existing capacitance pressure transmitter.Existing monocrystalline silicon formula pressure unit comprises the pressure transducer 11, oscillatory circuit 12, wave filter 13, analog to digital converter 14, microprocessor 15, digital to analog converter 16 and the current loop transducer 17 that are connected in series successively.
Capacitance pressure transmitter is placed in the work environment, switches on power, after the pressure transducer 11 of capacitance pressure transmitter is under pressure, will the capacitance be directly proportional to pressure will be produced and be sent to described oscillatory circuit 12; Described oscillatory circuit 12 is sent to described wave filter 13 after capacitance being converted to analog AC voltage signal; Described wave filter 13 converts analog DC voltage signal to after carrying out filtering to described analog AC voltage signal and is sent to described analog to digital converter 14; Described analog to digital converter is sent to described microprocessor 15 after converting described analog DC voltage signal to digital voltage signal; Described microprocessor 15 is sent to described digital to analog converter 16 after carrying out linear process to this digital voltage signal; After this digital voltage signal is changed into analog voltage signal by described digital to analog converter 16, by described current loop transducer 17 output current; Meanwhile, to connect a current sampling resistor at the output terminal of described current loop transducer 16, on current sampling resistor, a multimeter in parallel, reads the indicating value of this multimeter, and can obtain the size of current loop transducer 17 output current through simple computation.Due to, the pressure that described pressure transducer 11 is subject to and the electric current that current loop transducer exports are in certain linear relationship, by carrying out certain calculating to the output current of the current loop transducer 16 obtained, the pressure size that described pressure transducer 11 is subject to can be obtained.
But, the digital to analog converter of existing capacitance pressure transmitter, microprocessor and analog to digital converter are all separate parts, when producing capacitance pressure transmitter, need individually to buy all parts such as digital to analog converter, microprocessor, analog to digital converter and current loop transducer, then by this each independent component processing on circuit boards.And the expense of digital to analog converter, microprocessor, analog to digital converter and these parts of current loop transducer is all somewhat expensive, during batch production, production cost can be increased.Meanwhile, all parts of purchase needs to carry out paster respectively, also can greatly extend manufacture cycle.In addition, during by each independent component processing on circuit boards, because the volume ratio of each electronic unit is comparatively large, also can takies a large amount of area area of circuit board, increase circuit board making cost.In addition, when adopting oscillatory circuit to process the capacitance that sensor transmits, for reducing system power dissipation, the oscillation frequency of oscillatory circuit cannot be improved, and the precision of oscillatory circuit is relevant to oscillation frequency, this data precision that capacitance pressure transmitter is recorded is not high enough.
Utility model content
The utility model is to overcome the shortcoming of prior art with not enough, provides a kind of and saves cost, saves the paster time, the capacitance pressure transmitter of easy to use, low power consumption high-precision.
The utility model is achieved through the following technical solutions: a kind of capacitance pressure transmitter comprises pressure transducer, integrated chip and current loop transducer; Described pressure transducer is connected with described integrated chip; Produce the capacitance corresponding with described pressure after described pressure transducer is under pressure and be sent to described integrated chip; Described integrated chip comprises electric capacity digital conversion unit, digital signal processor, random access memory, pwm unit and bus extender; The capacitance of input is converted to digital voltage signal by described electric capacity digital conversion unit, and this digital voltage signal is sent to described digital signal processor; This digital voltage signal is sent to described random access memory by described digital signal processor; Described pwm unit extracts described digital voltage signal in described random access memory, and be sent to described bus extender after being converted to the analog pulse width modulation signal that dutycycle is directly proportional to pressure size, export analog voltage signal to described current loop transducer by bus extender; Described current loop transducer exports the electric current corresponding with the force value that described pressure transducer is subject to; Described current loop transducer is connected with extraneous power electric, and described current loop transducer is connected with the power input of described integrated chip, is powered to described current loop transducer and described integrated chip by extraneous power supply.
Compared to prior art, the utility model can realize processing the capacitance of pressure transducer transmission by carrying out simple configuration to described integrated chip, and export the electric current corresponding with the force value that described pressure transducer is subject to, simple to operate, easy to use; And multiple parts need be bought compared to prior art and multiple parts be carried out the mode of paster, the utility model saves the time each parts being connected to paster by integrated chip, shorten the production cycle, also greatly provide cost savings, improve reliability.Further, described integrated chip adopts the design of super low-power consumption, both circuit overall power consumption had been made to be reduced to about 300uA by the 1mA of prior art, make again measuring accuracy bring up to 0.05% by 0.1% of prior art, also by Measurement Resolution from 20,000 of prior art/bring up to 200,000/.
Further, also comprise signal filtering unit, after the filtering of the analog voltage signal that described integrated chip exports by this signal filtering unit, be sent to described current loop transducer.
Further, described integrated chip also comprises EEPROM (Electrically Erasable Programmable Read Only Memo); Described random access memory is communicated with extraneous PC host computer by described bus extender; Extraneous PC host computer extracts digital signal by described bus extender in described random access memory; Extraneous PC host computer obtains linear dimensions according to this digital signal, and downloads to described EEPROM (Electrically Erasable Programmable Read Only Memo) by described bus extender; Described digital signal processor reads linear dimensions in described EEPROM (Electrically Erasable Programmable Read Only Memo); Described digital signal processor is stored in described random access memory after changing the digital voltage signal transmitted from described electric capacity digital conversion unit according to this linear dimensions
Further, described integrated chip also comprises configuration register and parameter register; Described configuration register and described parameter register are interconnected, and described configuration register is connected with described electric capacity digital conversion unit, and described parameter register is connected with described random access memory.
In order to understand better and implement, describe the utility model in detail below in conjunction with accompanying drawing.
Accompanying drawing explanation
Fig. 1 is the work block diagram of existing capacitance pressure transmitter;
Fig. 2 is the work block diagram of the utility model capacitance pressure transmitter;
Fig. 3 is the structural representation of integrated chip 23 shown in Fig. 2.
Embodiment
Refer to Fig. 2, it is the work block diagram of the utility model capacitance pressure transmitter.This capacitance pressure transmitter comprises pressure transducer 21, first connection terminal 22, integrated chip 23, signal filtering unit 24, current loop transducer 25, first power filtering unit 26, voltage stabilizer 27 and second source filter unit 28 and the second connection terminal 29.
Described pressure transducer 21 is connected with described integrated chip 23 by the first connection terminal 22; Produce the capacitance corresponding with described pressure after described pressure transducer 21 is under pressure, and be sent to described integrated chip 23 by described first connection terminal 22.Described integrated chip 23 is sent to described signal filtering unit 24 after converting this capacitance to analog voltage signal; Described signal filtering unit 24 is sent to described current loop transducer 25 after carrying out filtering to this analog voltage signal; Described current loop transducer 25 exports the electric current corresponding with the force value that described pressure transducer 21 is subject to.Described current loop transducer 25 is connected with extraneous power electric by the first power filtering unit 26, described current loop transducer 25 is connected with the power input of second source filter unit 28 with described integrated chip 23 by described voltage stabilizer 27, is powered to described current loop transducer 25 and described integrated chip 23 by extraneous power supply.Meanwhile, carrying out timing signal to described capacitance pressure transmitter, described integrated chip 23 is connected with extraneous PC host computer by described second connection terminal 29; Described integrated chip 23 passes the signal to extraneous PC host computer; Extraneous PC host computer is according to downloading in described integrated chip 23 after signal acquisition linear dimensions, described integrated chip 23 exports analog voltage signal to described signal filtering unit 24 according to this linear dimensions again, and then makes described current loop transducer 25 export the electric current corresponding with the force value that described pressure transducer 21 is subject to.
In the present embodiment, the capacitance that described pressure transducer 21 transmits is connected with signal input part PC2 and PC3 of B port with described integrated chip 23 respectively by the A port of described first connection terminal 22.
Refer to Fig. 3, it is the structural representation of integrated chip 23 shown in Fig. 2.Described integrated chip 23 comprises electric capacity digital conversion unit (Capacitancedigitalconversion, be called for short CDC), digital signal processor (DigitalSignalProcessing, be called for short DSP), random access memory (Random-AccessMemory, be called for short RAM), pwm unit (PulseWidthModulation, be called for short PWM), bus extender (GeneralPurposeInputOutput, referred to as GPIO), EEPROM (Electrically Erasable Programmable Read Only Memo) (ElectricallyErasableProgrammableRead-OnlyMemory, be called for short EEPROM), parameter register, configuration register, static RAM (StaticRandomAccessMemory, be called for short SRAM), disposable programmable memory (OneTimeProgramable, hereinafter referred to as OTP), 1.8V voltage regulation unit and oscillatory circuit module.
The capacitance inputted from signal input part PC2 and PC3 of described integrated chip 23 is sent to the electric capacity digital conversion unit of described integrated chip 23; Described electric capacity digital conversion unit is converted to digital voltage signal after the capacitance of input is carried out multiple averaging calculating, and this digital voltage signal is sent to described digital signal processor; Described digital signal processor is sent to described random access memory after carrying out linear compensation to described digital voltage signal; Described pwm unit extracts described digital voltage signal in described random access memory, and change the analog pulse width modulation signal that output duty cycle is directly proportional to pressure size, and then be sent to described bus extender, export analog voltage signal to described signal filtering unit 24 by the signal output part SSN_PG0 of bus extender, after filtering being carried out to this analog voltage signal by described signal filtering unit 24, be sent to described current loop transducer 25; Described current loop transducer 25 converts this analog power supply signal to analog current signal, and exports the electric current corresponding with described pressure transducer 21 pressure.The power input of described current loop transducer 25 is connected with extraneous power electric by the first power filtering unit 26, described current loop transducer 25 is connected with the power input VDD33 of second source filter unit 28 with described integrated chip 23 by described voltage stabilizer 27, is powered to described current loop transducer 25 and described integrated chip 23 by extraneous power supply.The power input of described current loop transducer 25 is also signal output part simultaneously, between the positive pole and the connecting circuit of described first power filtering unit 26 of extraneous power supply and the negative pole of extraneous power supply be connected in series a current sampling resistor with between described first power filtering unit 26, a multimeter in parallel on current sampling resistor again, the pressure indicating value namely by reading multimeter obtains the output current value of described current loop transducer 25 indirectly.
Simultaneously, timing signal is carried out to described capacitance pressure transmitter, described random access memory is communicated with extraneous PC host computer by signal input output end mouth SCK_SCL with MOSI_SDA of described bus extender, and extraneous PC host computer extracts the digital signal of storage in described random access memory by described bus extender.Extraneous PC host computer obtains linear dimensions according to this digital signal, and linear dimensions is downloaded to described EEPROM (Electrically Erasable Programmable Read Only Memo) by signal input output end mouth SCK_SCL and MOSI_SDA of described bus extender; Described digital signal processor reads linear dimensions again in described EEPROM (Electrically Erasable Programmable Read Only Memo) can set up inner linear parameter model.After described digital signal processor processes the digital voltage signal transmitted from described electric capacity digital conversion unit according to inner parameter model, be stored in described random access memory, and convert analog voltage signal to by described pwm unit, and then control described current loop transducer 25 and export 4 ~ 20mA current signal.In the present embodiment, in described integrated chip, each parts are that I2C communicates with the communication mode of extraneous PC host computer.
Described configuration register and described parameter register are interconnected, and described configuration register is connected with described electric capacity digital conversion unit, and described parameter register is connected with described random access memory; Extraneous PC host computer configures the parameter of described parameter register by described bus extender, and then the described electric capacity digital conversion unit of configuration setting is to the signal input port of described pressure transducer 21; The interface of configuration random-access memory; Configure the time signal of described oscillatory circuit module.
Described static RAM is connected with described digital signal processor with described disposable programmable memory, and stores the information of described digital signal processor.
Working temperature residing for described pressure transducer 21 has a certain impact to the pressure measured by it, and therefore, for making the pressure of measurement more accurate, described integrated chip 23 also comprises temperature measurement unit.Described temperature measurement unit is connected with described digital signal processor.Increase by a temperature sensor in the outside of described integrated chip 23, described temperature sensor is arranged in the working environment common with pressure transducer 21, and signal input part PT0 with PT1 of described temperature sensor signal output terminal by described integrated chip 23 is connected with described temperature measurement unit, the operating tempera-ture signal of pressure transducer 21 actual working environment can be obtained.Described digital signal processor exports after carrying out linear compensation process by the temperature signal that reality obtained and pressure signal again, the current value of acquisition can be made more accurate, and then make the force value of acquisition also more accurate.
Described 1.8V voltage regulation unit is connected with described parameter register, configuration register, random access memory, digital signal processor, static RAM and disposable programmable memory, and powers to described parameter register, configuration register, random access memory, digital signal processor, static RAM and disposable programmable memory.
Because described digital signal processor work needs clock signal synchronization, described oscillatory circuit module is connected with described digital signal processor, and provides clock signal for described digital signal processor.
Described signal filtering unit 24 comprises the first resistance R1, the second resistance R2, the first electric capacity C1 and the second electric capacity C2.Described first resistance R1 connects with described integrated chip 23, and its one end is connected with described integrated chip 23, and the other end is connected with described second resistance R2.Described second resistance R2 connects with described first resistance R1, and its one end is connected with described first resistance R1, and the other end is connected with the signal input part of described current loop transducer 25.Described first electric capacity C1 mono-end is connected between described first resistance R1 and the second resistance R2, other end ground connection.Described second electric capacity C2 mono-end is connected between described second resistance R2 and described current loop transducer 25, other end ground connection.
Described first power filtering unit 26 comprises the first inductance L 1, second inductance L 2, transient voltage suppressor Q1, commutation diode Q2, the 3rd electric capacity C3 and the 4th electric capacity C4.Described first inductance L 1 one end is connected with described current loop transducer 25, between the other end and extraneous power positive end.Described second inductance L 2 one end is connected with described current loop transducer 25, and the other end is extremely connected with extraneous power-.One end of described transient voltage suppressor Q1 is connected to described current loop transducer 25 with in extraneous power positive end connecting circuit, and the other end connects described current loop transducer 25 with in the extreme connecting circuit of extraneous power-.Described commutation diode Q2 connects with described first inductance L 1, and its one end is connected with described first inductance L 1, and the other end is connected with the output terminal of described current loop transducer.One end of described 3rd electric capacity C3 and the 4th electric capacity C4 is all connected to described current loop transducer 25 with in extraneous power positive end connecting circuit, and the other end is all connected to described current loop transducer 25 with in the extreme connecting circuit of extraneous power-.
Described second source filter unit 28 comprises the 5th electric capacity C5, the 6th electric capacity C6, the 7th electric capacity C7, the 8th electric capacity C8 and the 9th electric capacity C9.Described 5th electric capacity C5 is all connected with described voltage stabilizer 27 with the 6th electric capacity C6 one end, the equal ground connection of the other end.Described 7th electric capacity C7, the 8th electric capacity C8 are all connected with the 1.8V voltage regulation unit of described integrated chip 23 with the 9th electric capacity C9 one end, and the other end is all connected with the Enable Pin IIC_EN of the bus extension unit of described integrated chip 23.
For directly reading pressure indicating value from capacitance pressure transmitter, in the present embodiment, described capacitance pressure transmitter also comprises LCDs (not shown).Described LCDs is connected with the digital signal processor of described integrated chip 23.The voltage signal produced in circuit, according to the linear relationship of voltage and pressure, is directly changed into pressure by described digital signal processor, and in liquid crystal display screen display.
For convenience of carrying out optimum configurations to capacitance pressure transmitter, make can arrange instrument parameter without the need to being connected with host computer, in the present embodiment, described capacitance pressure transmitter also comprises key-press module (not shown).Described key-press module is connected with the digital signal processor of described integrated chip 23, when needs arrange instrument parameter, can be realized the setting of parameter by key-press module.
Further, also comprise for carrying out with the PC host computer in the external world conversion terminal (not shown) that communicates, described conversion terminal is connected with described second connection terminal 29.The digital voltage signal that described digital signal processor exports is by the second connection terminal 29 described in SCK_SCL and the MOSI_SDA conveyance conduit of described integrated chip 23, and this digital voltage signal is sent to described conversion terminal by described second connection terminal 29 again; Convert the signal into usb signal by described conversion terminal to realize communicating with extraneous PC host computer.
Further, extraneous power supply positive pole with between described first power filtering unit 26 and the negative pole of extraneous power supply be connected in series a current sampling resistor with between described first power filtering unit 26, a multimeter in parallel on current sampling resistor again, indirectly can be obtained the output current value of described current loop transducer by the indicating value reading multimeter, and then obtain the force value corresponding with electric current.
Below describe the course of work of described capacitance pressure transmitter in detail: arranged in the work environment by described capacitance pressure transmitter, produce the capacitance corresponding with force value after described pressure transducer 21 is under pressure, and be transported to described electric capacity digital conversion unit from signal input part PG2 and PG3 of described integrated chip 23; Described electric capacity digital conversion unit obtains digital voltage signal after carrying out multiple averaging calculating to these two capacitance sizes, and this digital voltage signal is sent to described digital signal processor; Described digital signal processor is sent to described random access memory after carrying out linear compensation to described digital voltage signal; Described pwm unit extracts described digital voltage signal in described random access memory, and change the analog pulse width modulation signal that output duty cycle is directly proportional to pressure size, and then be sent to described bus extender, export analog voltage signal to described current loop transducer 25 by the signal output port SSN_PG0 of bus extender; After described current loop transducer 25 converts this analog pulse width modulation signal to analog current signal, and then export the electric current corresponding with described pressure transducer 21 pressure.By observe multimeter can obtain the voltage corresponding with the force value that described pressure transducer 21 is subject to, then this voltage transitions is become electric current go forward side by side line linearity calculate, the pressure size that described pressure transducer 21 is subject to can be obtained.Meanwhile, digital signal also directly can calculate according to inner parameter model and convert force value to by described digital signal processor, and described LCDs also directly can read force value.
Needing to demarcate for the new capacitance pressure transmitter produced, in the present embodiment, take calibrated span as the capacitance pressure transmitter of 0-40KPa pressure is example, adopts and can demarcate capacitance pressure transmitter the standard pressure generator of accurate outputting standard pressure.Standard pressure generator is acted on described pressure transducer 21, powers to described capacitance pressure transmitter simultaneously, after communication of determining is normal, start to demarcate, usual calibration point selects zero, in, Man Sandian.Specific as follows:
First demarcate zero point, namely control criterion pressure source exports the pressure of I0KPa, observes the current value that PC host computer collects, and treats that it gathers after stable.Then demarcate mid point, namely control criterion pressure source exports the pressure of 20KPa, observes the current value that PC host computer collects, and treats that it gathers after stable.Then demarcate and work to the last minute, namely control criterion pressure source exports the pressure of 40KPa, observes the current value that host computer collects, and treats that it gathers after stable.PC host computer carries out linearization calculation to the current value collected, and the linear dimensions calculated is sent to described integrated chip 23 by conversion terminal and the second connection terminal 29, by described bus extender, linear dimensions is downloaded in the EEPROM (Electrically Erasable Programmable Read Only Memo) of integrated chip 23 again, in EEPROM (Electrically Erasable Programmable Read Only Memo), extract linear dimensions by digital signal processor and set up inner parameter model, demarcating and just complete.
Be exactly finally verification, control criterion pressure source exports the pressure of 0-40KPa again, and whether the output voltage observed on multimeter is accurate, such as, control criterion pressure source exports the pressure of 0KPa, checks the output voltage values on multimeter, and calculates current value and whether equal 4mA; Control criterion pressure source exports the pressure of 20KPa, checks the output voltage values on multimeter, and calculates current value and whether equal 12mA; Control criterion pressure source exports the pressure of 40KPa, checks the output voltage values on multimeter, and calculates current value and whether equal 20mA.If it is qualified to verify, namely capacitance pressure transmitter is qualified.
When needs amendment parameter, only need to modify at the PC host computer in the external world, the DSP inner parameter model of heavily loaded described integrated chip 23, simple to operate, easy to use.
Compared to prior art, the utility model can realize processing the capacitance of pressure transducer transmission by carrying out simple configuration to described integrated chip, and export the electric current corresponding with the force value that described pressure transducer is subject to, simple to operate, easy to use; Need buy multiple parts compared to prior art and multiple parts be carried out the mode of paster, the utility model saves the time each parts being connected to paster by integrated chip, shorten the production cycle, also greatly provide cost savings, improve reliability.Further, described integrated chip adopts the design of super low-power consumption, both circuit overall power consumption had been made to be reduced to about 300uA by the 1mA of prior art, make again measuring accuracy bring up to 0.05% by 0.1% of prior art, also by Measurement Resolution from 20,000 of prior art/bring up to 200,000/.
The utility model is not limited to above-mentioned embodiment, if do not depart from spirit and scope of the present utility model to various change of the present utility model or distortion, if these are changed and distortion belongs within claim of the present utility model and equivalent technologies scope, then the utility model is also intended to comprise these changes and distortion.
Claims (10)
1. a capacitance pressure transmitter, is characterized in that: comprise pressure transducer, integrated chip and current loop transducer; Described pressure transducer is connected with described integrated chip; Produce the capacitance corresponding with described pressure after described pressure transducer is under pressure and be sent to described integrated chip; Described integrated chip comprises electric capacity digital conversion unit, digital signal processor, random access memory, pwm unit and bus extender; The capacitance of input is converted to digital voltage signal by described electric capacity digital conversion unit, and this digital voltage signal is sent to described digital signal processor; This digital voltage signal is sent to described random access memory by described digital signal processor; Described pwm unit extracts described digital voltage signal in described random access memory, and be sent to described bus extender after being converted to the analog pulse width modulation signal that dutycycle is directly proportional to pressure size, export analog voltage signal to described current loop transducer by bus extender; Described current loop transducer exports the electric current corresponding with the force value that described pressure transducer is subject to; Described current loop transducer is connected with extraneous power electric, and described current loop transducer is connected with the power input of described integrated chip, is powered to described current loop transducer and described integrated chip by extraneous power supply.
2. capacitance pressure transmitter according to claim 1, is characterized in that: also comprise signal filtering unit, is sent to described current loop transducer after the filtering of the analog voltage signal that described integrated chip exports by this signal filtering unit.
3. capacitance pressure transmitter according to claim 2, is characterized in that: described integrated chip also comprises EEPROM (Electrically Erasable Programmable Read Only Memo); Described random access memory is communicated with extraneous PC host computer by described bus extender; Extraneous PC host computer extracts digital voltage signal by described bus extender in described random access memory; Extraneous PC host computer obtains linear dimensions according to this digital voltage signal, and downloads to described EEPROM (Electrically Erasable Programmable Read Only Memo) by described bus extender; Described digital signal processor reads linear dimensions in described EEPROM (Electrically Erasable Programmable Read Only Memo); Described digital signal processor is stored in described random access memory after changing the digital voltage signal transmitted from described electric capacity digital conversion unit according to this linear dimensions.
4. capacitance pressure transmitter according to claim 3, is characterized in that: described integrated chip also comprises configuration register and parameter register; Described configuration register and described parameter register are interconnected, and described configuration register is connected with described electric capacity digital conversion unit, and described parameter register is connected with described random access memory.
5. capacitance pressure transmitter according to claim 4, is characterized in that: described integrated chip also comprises static RAM and disposable programmable memory; Described static RAM is connected with described digital signal processor with described disposable programmable memory, and stores the information of described digital signal processor.
6. capacitance pressure transmitter according to claim 5, is characterized in that: described integrated chip also comprises 1.8V voltage regulation unit; Described 1.8V voltage regulation unit is connected with described parameter register, configuration register, random access memory, digital signal processor, static RAM and disposable programmable memory, and powers to described parameter register, configuration register, random access memory, digital signal processor, static RAM and disposable programmable memory.
7. capacitance pressure transmitter according to claim 6, is characterized in that: described integrated chip also comprises oscillatory circuit module, and described oscillatory circuit module is connected with described digital signal processor, and provides clock signal for described digital signal processor.
8. the capacitance pressure transmitter according to claim arbitrary in claim 1-7, is characterized in that: also comprise the first power filtering unit; Described current loop transducer is connected with extraneous power electric by the first power filtering unit.
9. capacitance pressure transmitter according to claim 8, is characterized in that: also comprise voltage stabilizer and second source filter unit; Described current loop transducer is connected with the power input of second source filter unit with described integrated chip by described voltage stabilizer.
10. capacitance pressure transmitter according to claim 9, is characterized in that: also comprise the first connection terminal; Described pressure transducer is connected with described integrated chip by the first connection terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520677728.8U CN204988565U (en) | 2015-09-02 | 2015-09-02 | Capacitanc pressure transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520677728.8U CN204988565U (en) | 2015-09-02 | 2015-09-02 | Capacitanc pressure transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204988565U true CN204988565U (en) | 2016-01-20 |
Family
ID=55122923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520677728.8U Expired - Fee Related CN204988565U (en) | 2015-09-02 | 2015-09-02 | Capacitanc pressure transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204988565U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108120552A (en) * | 2016-11-30 | 2018-06-05 | 德克萨斯仪器股份有限公司 | For the method and apparatus of calibrated microelectromechanicmicrophone system |
-
2015
- 2015-09-02 CN CN201520677728.8U patent/CN204988565U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108120552A (en) * | 2016-11-30 | 2018-06-05 | 德克萨斯仪器股份有限公司 | For the method and apparatus of calibrated microelectromechanicmicrophone system |
| CN108120552B (en) * | 2016-11-30 | 2021-08-24 | 德克萨斯仪器股份有限公司 | Pressure sensor calibration device and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102032974B (en) | Temperature compensation method for pressure sensor | |
| CN104614593A (en) | Self-calibration based high-precision intelligent instrument system and application method thereof | |
| CN201094017Y (en) | Atmospheric pressure altimeter | |
| CN101408553B (en) | Rotary peed-measuring and frequency outputting device | |
| CN204556077U (en) | A kind of low-power consumption body weigher based on radio communication | |
| CN203606434U (en) | Impedance measurement circuit | |
| CN102313622A (en) | Capacitance detection circuit and capacitive type pressure transmitter | |
| CN205720565U (en) | A kind of batch testing plate for testing signal condition chip | |
| CN204988565U (en) | Capacitanc pressure transmitter | |
| CN204988567U (en) | Monocrystalline silicon formula pressure transmitter | |
| CN104199343A (en) | Micro data collection system based on serial storage mode | |
| CN201886059U (en) | Positive-negative voltage measuring device | |
| CN207557152U (en) | A kind of novel pH value intelligent measure circuit | |
| CN104568261A (en) | Digital strain torque sensor on basis of multifunctional signal conditioning system | |
| CN201892592U (en) | Modular circuit of pressure sensor | |
| CN208026855U (en) | A kind of electronic transducer calibration instrument is traced to the source device signal source | |
| CN203732198U (en) | Pressure transmitter | |
| CN203337317U (en) | Debugging and temperature compensation circuit for pressure sensor | |
| CN203100945U (en) | Non-linear correction device for intelligent pressure sensor | |
| CN201035743Y (en) | Humiture transducer | |
| CN103616086B (en) | Thermal resistance temperature transmitter | |
| CN210719453U (en) | Thermal resistance temperature measuring device based on RS485 bus | |
| CN211453722U (en) | PWM temperature compensation circuit for Wheatstone bridge | |
| CN204242380U (en) | Based on the distributed automatic weather station of 2.4G wireless transmission | |
| CN204758198U (en) | Intelligent little differential pressure transmitter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160120 Termination date: 20190902 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |