CN109916537A - A kind of pressure data acquisition system based on picogram bus transfer agreement - Google Patents
A kind of pressure data acquisition system based on picogram bus transfer agreement Download PDFInfo
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- CN109916537A CN109916537A CN201910258086.0A CN201910258086A CN109916537A CN 109916537 A CN109916537 A CN 109916537A CN 201910258086 A CN201910258086 A CN 201910258086A CN 109916537 A CN109916537 A CN 109916537A
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Abstract
A kind of pressure data acquisition system based on picogram bus transfer agreement of the present invention, belongs to pressure data acquisition system technical field；Technical problem to be solved are as follows: a kind of pressure data acquisition system based on picogram bus transfer agreement is provided；Solve the technical solution of technical problem use are as follows: including digital pressure sensor and sensor transducer, the sensor transducer is connected by communication interface drive module with multiple digital pressure sensors；The digital pressure sensor is made of shell, and one end of the shell is encapsulated by waterproof gasket cement, and the other end of the shell is encapsulated by pressure ring and top cover；The shell is internally provided with control circuit board, and the space between the control circuit board and shell is filled by insulated enclosure layer；The control circuit board is fixed on the inside of shell by welding ring；Microcontroller is integrated in the control circuit board, the microcontroller is connected with pressure sensor, temperature sensor respectively by analog-to-digital conversion module；The present invention is applied to pressure data acquisition system.
Description
Technical field
A kind of pressure data acquisition system based on picogram bus transfer agreement of the present invention, belongs to pressure data acquisition system
Technical field.
Background technique
Pressure sensor is the core component of pressure testing system, and traditional pressure sensor output is analog signal,
Having to pass through signal conditioning circuit can just detect, general pressure sensor volume and weight are all larger, bring to application apparatus
Very big burden, and the analog signal of sensor output anti-interference ability in the long range cable transmission process is poor, shadow
Ring the final collected quality of data.
Similar sensor is used in current pressure data acquisition system, overload capacity is poor, precision is low, using old
Transmission plan is then the collected analog signal uniform transmission of each sensor is carried out analog-to-digital conversion to capture card again, it
After access in 422 buses, do so the quantity that will increase transmission cable, and 422 traditional buses are that point-to-point connection is
System, keep experimentation cost of the product in R&D process higher, every time test all have to pass through single machine measurement, single machine Interface Matching,
Subsystem matching, general assembly test and etc., when single device break down when, can not be direct with all devices in bus in outside
Communication detection, it is necessary to be measured after dismantling, the higher cost of debugging.
Summary of the invention
The present invention is in order to overcome the deficiencies in the prior art, technical problem to be solved are as follows: provides one kind and is based on
The pressure data acquisition system of picogram bus transfer agreement；In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention
Are as follows: a kind of pressure data acquisition system based on picogram bus transfer agreement, including digital pressure sensor and sensor transformation
Device, the sensor transducer are connected by communication interface drive module with multiple digital pressure sensors；
The digital pressure sensor is made of shell, and one end of the shell is encapsulated by waterproof gasket cement, the shell it is another
One end is encapsulated by pressure ring and top cover；
The shell is internally provided with control circuit board, and the space between the control circuit board and shell is by insulated enclosure layer
Filling；
The control circuit board is fixed on the inside of shell by welding ring；
Be integrated with microcontroller in the control circuit board, the microcontroller by analog-to-digital conversion module respectively with pressure sensing
Device, temperature sensor are connected；
The microcontroller also passes through conducting wire and is bi-directionally connected with data communication module, and the data communication module is by conducting wire and passes
Sensor converter is bi-directionally connected；
The sensor transducer is internally provided with data receiving and transmitting controller, the signal output end of the data receiving and transmitting controller
It is bi-directionally connected with communication interface drive module, the communication interface drive module is connected by conducting wire with data communication module；
The signal input part of the data receiving and transmitting controller is bi-directionally connected with picogram bus communication module；
The picogram bus communication module is connected by conducting wire with router；
The power input of the microcontroller and data receiving and transmitting controller is connected with power module respectively.
The chip that the picogram bus communication module uses is signal transmission chip U1, cable driver U2, signal receive
Chip U3, data recoverer U4, the circuit structure of the picogram bus communication module are as follows:
- 11 foot of 1 foot of the signal transmission chip U1 is connected with the signal input part of data receiving and transmitting controller；
It is grounded after the 30 foot series resistor R17 of the signal transmission chip U1；
It is grounded after the 31 foot series resistor R18 of the signal transmission chip U1；
It is grounded after the 18 foot series resistor R20 of the signal transmission chip U1；
It is grounded after the 23 foot series resistor R19 of the signal transmission chip U1；
One end of 21 feet of the signal transmission chip U1 and connecting resistance R22, one end of resistance R25, behind one end of resistance R26 with
2 feet of cable driver U2 are connected；
One end of 20 feet of the signal transmission chip U1 and connecting resistance R22, one end of resistance R23, behind one end of resistance R24 with
3 feet of cable driver U2 are connected；
16 feet of the signal transmission chip U1 successively and connect 25 feet of signal transmission chip U1,26 feet, 27 feet, 28 feet, 29 feet,
One end of capacitor C46, one end of capacitor C47 are connected behind one end of capacitor C48 with 3.3V input power, the capacitor C46,
The other end of C47, C48 are grounded after being connected with each other；
It is connected after the other end of the resistance R23 and the other end of connecting resistance R25 with 3.3V input power；
It is grounded after the other end of the resistance R24 and the other end of connecting resistance R26；
It is grounded after the 4 foot series resistor R27 of the cable driver U2；
It is connected behind 7 feet of the cable driver U2 and one end of connecting resistance R29 with one end of capacitor C51, the capacitor C51's
The other end is connected with connecting terminal J5；
It is connected behind 6 feet of the cable driver U2 and one end of connecting resistance R28 with one end of capacitor C50, the capacitor C50's
The other end is connected with connecting terminal J5；
The other end of the resistance R28 and resistance R29 is grounded after being connected with each other；
- 18 foot of 14 foot of the signal receiving chip U3, -27 foot of 23 foot are connected with the signal output end of data receiving and transmitting controller；
4 feet of the signal receiving chip U3 are simultaneously connected after connecing 5 feet of signal receiving chip U3 with one end of resistance R47, described
The other end of resistance R47 is connected with 3.3V input power；
1 foot, 8 feet, 9 feet, 22 feet, 20 feet of the signal receiving chip U3 are connected with 3.3V input power respectively；
One end of 2 feet of the signal receiving chip U3 and connecting resistance R50, one end of resistance R54, behind one end of resistance R53 with
One end of capacitor C66 is connected, 13 feet after the other end of the capacitor C66 and one end of connecting resistance R55 with data recoverer U4
It is connected；
The other end of 3 feet of the signal receiving chip U3 and connecting resistance R50, one end of resistance R51, behind one end of resistance R52
Be connected with one end of capacitor C67, behind one end of the other end of the capacitor C67 and connecting resistance R56 with data recoverer U4 14
Foot is connected；
It is connected after the other end of the resistance R51 and the other end of connecting resistance R53 with 3.3V input power, the resistance R52's
It is grounded after the other end of the other end and connecting resistance R54, the other end of the resistance R55 and the other end of connecting resistance R56, diode
One end of capacitor C68 is connected after after the cathode of D4, the other end ground connection of the capacitor C68；
It is connected after the 7 foot serial capacitance C69 of the data recoverer U4 with 6 feet of data recoverer U4；
The anode of the diode D4 and the one end for connecing 4 feet of data recoverer U4,1 foot, 2 feet, capacitor C70, the one of capacitor C72
It is connected behind end with 5V input power, is grounded after the other end of the other end shunt-wound capacitance C72 of the capacitor C70；
12 feet of the data recoverer U4 are simultaneously connected after connecing 5 feet of data recoverer U4 with one end of capacitor C71, the capacitor
The other end of C71 is grounded；
It is connected after the 8 foot series resistor R59 of the data recoverer U4 with one end of capacitor C75, the other end of the capacitor C75
And be connected behind one end of connecting resistance R60 with one end of resistance R62, the other end of the resistance R62 is connected with connecting terminal J5；
It is connected after the 9 foot series resistor R58 of the data recoverer U4 with one end of capacitor C74, the other end of the capacitor C74
And be connected behind one end of connecting resistance R61 with one end of resistance R63, the other end of the resistance R63 is connected with connecting terminal J5；
It is grounded after the other end of the resistance R60 and the other end of connecting resistance R61；
It is grounded after the 3 foot series resistor R57 and capacitor C73 of the data recoverer U4.
The chip that the power module uses is voltage-stablizer U8, the circuit structure of the power module are as follows:
2 feet of the voltage-stablizer U8 successively and connect one end of 3 feet of voltage-stablizer U8,10 feet, 11 feet, 8 feet, capacitor C58, capacitor
It is connected behind one end of C57 with 5V input power；
9 feet of the voltage-stablizer U8 successively and connect 1 foot of voltage-stablizer U8,12 feet, 13 feet, 24 feet, 7 feet, capacitor C58 it is another
It holds, is grounded after the other end of capacitor C57；
14 feet of the voltage-stablizer U8 successively and connect defeated with 1.2V power supply behind one end of 15 feet of voltage-stablizer U8,16 feet, capacitor C60
Outlet is connected；
21 feet of the voltage-stablizer U8 successively and connect defeated with 3.3V power supply behind one end of 22 feet of voltage-stablizer U8,23 feet, capacitor C59
Outlet is connected；
It is grounded after the other end of the other end shunt-wound capacitance C60 of the capacitor C59.
The chip that the communication interface drive module uses is bus extender U20, the communication interface drive module
Circuit structure are as follows:
It is connected behind 2 feet of the bus extender U20 and one end of connecting resistance R40 with the signal output end of data communication module,
Another termination 3.3V input power of the resistance R40；
3 feet of the bus extender U20 are connected with the signal output end of data communication module；
4 feet of the bus extender U20 are grounded；
6 feet of the bus extender U20 are connected with the signal input part of data receiving and transmitting controller；
Signal input part phase after 7 feet of the bus extender U20 and one end of connecting resistance R42 with data receiving and transmitting controller
Even, another termination 3.3V input power of the resistance R42；
One end of the 8 foot shunt-wound capacitance C48 of the bus extender U20, behind one end of capacitor C49 with 3.3V power input phase
Even, it is grounded after the other end of the other end shunt-wound capacitance C49 of the capacitor C48.
The model DS921V1023ARHBQ of the signal transmission chip U1；
The model CLC001 of the cable driver U2；
The model DS921V1224ARHBQ of the signal receiving chip U3；
The model CLC014 of the data recoverer U4；
The model TPS70345 of the voltage-stablizer U8；
The model P82B715 of the bus extender U20.
What the present invention had compared with the existing technology has the beneficial effect that the present invention to overcome existing pressure sensor mould
Poor signal quality, precision be low in quasi- signals transmission, the skimble-scamble defect of interface, directly and picogram using sensor transducer
Router communication in bus at different temperatures measures relevant pressure value；The digital pressure sensor used has
Micro energy lose I2C communication interface, end are sealed by marine glue, and are filled and fixed by insulating materials, can make it under severe conditions
It uses, sensor internal is integrated with the modules such as presser sensor head, temperature sensing head, analog-to-digital conversion, and structure is simple, has compressed sensing
Body product；All data are transmitted by digital signal form, and the communication interface drive module of setting can increase transmission range, mention
The reliability of high data transmission；The control to multiple sensor and the coding of multichannel data may be implemented using sensor transducer
Transfer function, over-sampling rate and sampling interval are controllable, and multiple sensor autopolling acquires data, have picogram bus interface,
It can be with router direct communication.
Detailed description of the invention
The present invention will be further described with reference to the accompanying drawing:
Fig. 1 is the structural schematic diagram of digital pressure sensor of the present invention；
Fig. 2 is the electrical block diagram of digital pressure sensor of the present invention；
Fig. 3 is the electrical block diagram of inventive sensor converter；
Fig. 4 is the circuit diagram of picogram bus communication module of the present invention；
Fig. 5 is the circuit diagram of power module of the present invention；
Fig. 6 is the circuit diagram of communication interface drive module of the present invention；
In figure: 1 being digital pressure sensor, 2 be sensor transducer, 3 be communication interface drive module, 4 be shell, 5 be anti-
Watertight sealing, 6 be pressure ring, 7 be top cover, 8 be control circuit board, 9 be insulated enclosure layer, 10 be welding ring, 11 be microcontroller,
12 it is analog-to-digital conversion module, 13 be pressure sensor, 14 be temperature sensor, 15 be data communication module, 16 is data transmit-receive
Controller, 17 be picogram bus communication module, 18 be router, 19 be power module.
Specific embodiment
As shown in figures 1 to 6, a kind of pressure data acquisition system based on picogram bus transfer agreement of the present invention, including
Digital pressure sensor (1) and sensor transducer (2), the sensor transducer (2) pass through communication interface drive module (3)
It is connected with multiple digital pressure sensors (1)；
The digital pressure sensor (1) is made of shell (4), and one end of the shell (4) is encapsulated by waterproof gasket cement (5),
The other end of the shell (4) is encapsulated by pressure ring (6) and top cover (7)；
The shell (4) is internally provided with control circuit board (8), the space between the control circuit board (8) and shell (4)
It is filled by insulated enclosure layer (9)；
The control circuit board (8) is fixed on the inside of shell (4) by welding ring (10)；
It is integrated with microcontroller (11) on the control circuit board (8), the microcontroller (11) passes through analog-to-digital conversion module
(12) it is connected respectively with pressure sensor (13), temperature sensor (14)；
The microcontroller (11) is also bi-directionally connected by conducting wire with data communication module (15), the data communication module (15)
It is bi-directionally connected by conducting wire and sensor transducer (2)；
The sensor transducer (2) is internally provided with data receiving and transmitting controller (16), the data receiving and transmitting controller (16)
Signal output end be bi-directionally connected with communication interface drive module (3), the communication interface drive module (3) pass through conducting wire and number
It is connected according to communication module (15)；
The signal input part of the data receiving and transmitting controller (16) is bi-directionally connected with picogram bus communication module (17)；
The picogram bus communication module (17) is connected by conducting wire with router (18)；
The power input of the microcontroller (11) and data receiving and transmitting controller (16) is connected with power module (19) respectively.
The chip that the picogram bus communication module (17) uses is signal transmission chip U1, cable driver U2, signal
Receive chip U3, data recoverer U4, the circuit structure of the picogram bus communication module (17) are as follows:
- 11 foot of 1 foot of the signal transmission chip U1 is connected with the signal input part of data receiving and transmitting controller (16)；
It is grounded after the 30 foot series resistor R17 of the signal transmission chip U1；
It is grounded after the 31 foot series resistor R18 of the signal transmission chip U1；
It is grounded after the 18 foot series resistor R20 of the signal transmission chip U1；
It is grounded after the 23 foot series resistor R19 of the signal transmission chip U1；
One end of 21 feet of the signal transmission chip U1 and connecting resistance R22, one end of resistance R25, behind one end of resistance R26 with
2 feet of cable driver U2 are connected；
One end of 20 feet of the signal transmission chip U1 and connecting resistance R22, one end of resistance R23, behind one end of resistance R24 with
3 feet of cable driver U2 are connected；
16 feet of the signal transmission chip U1 successively and connect 25 feet of signal transmission chip U1,26 feet, 27 feet, 28 feet, 29 feet,
One end of capacitor C46, one end of capacitor C47 are connected behind one end of capacitor C48 with 3.3V input power, the capacitor C46,
The other end of C47, C48 are grounded after being connected with each other；
It is connected after the other end of the resistance R23 and the other end of connecting resistance R25 with 3.3V input power；
It is grounded after the other end of the resistance R24 and the other end of connecting resistance R26；
It is grounded after the 4 foot series resistor R27 of the cable driver U2；
It is connected behind 7 feet of the cable driver U2 and one end of connecting resistance R29 with one end of capacitor C51, the capacitor C51's
The other end is connected with connecting terminal J5；
It is connected behind 6 feet of the cable driver U2 and one end of connecting resistance R28 with one end of capacitor C50, the capacitor C50's
The other end is connected with connecting terminal J5；
The other end of the resistance R28 and resistance R29 is grounded after being connected with each other；
- 18 foot of 14 foot of the signal receiving chip U3, the signal output end phase of -27 foot of 23 foot and data receiving and transmitting controller (16)
Even；
4 feet of the signal receiving chip U3 are simultaneously connected after connecing 5 feet of signal receiving chip U3 with one end of resistance R47, described
The other end of resistance R47 is connected with 3.3V input power；
1 foot, 8 feet, 9 feet, 22 feet, 20 feet of the signal receiving chip U3 are connected with 3.3V input power respectively；
One end of 2 feet of the signal receiving chip U3 and connecting resistance R50, one end of resistance R54, behind one end of resistance R53 with
One end of capacitor C66 is connected, 13 feet after the other end of the capacitor C66 and one end of connecting resistance R55 with data recoverer U4
It is connected；
The other end of 3 feet of the signal receiving chip U3 and connecting resistance R50, one end of resistance R51, behind one end of resistance R52
Be connected with one end of capacitor C67, behind one end of the other end of the capacitor C67 and connecting resistance R56 with data recoverer U4 14
Foot is connected；
It is connected after the other end of the resistance R51 and the other end of connecting resistance R53 with 3.3V input power, the resistance R52's
It is grounded after the other end of the other end and connecting resistance R54, the other end of the resistance R55 and the other end of connecting resistance R56, diode
One end of capacitor C68 is connected after after the cathode of D4, the other end ground connection of the capacitor C68；
It is connected after the 7 foot serial capacitance C69 of the data recoverer U4 with 6 feet of data recoverer U4；
The anode of the diode D4 and the one end for connecing 4 feet of data recoverer U4,1 foot, 2 feet, capacitor C70, the one of capacitor C72
It is connected behind end with 5V input power, is grounded after the other end of the other end shunt-wound capacitance C72 of the capacitor C70；
12 feet of the data recoverer U4 are simultaneously connected after connecing 5 feet of data recoverer U4 with one end of capacitor C71, the capacitor
The other end of C71 is grounded；
It is connected after the 8 foot series resistor R59 of the data recoverer U4 with one end of capacitor C75, the other end of the capacitor C75
And be connected behind one end of connecting resistance R60 with one end of resistance R62, the other end of the resistance R62 is connected with connecting terminal J5；
It is connected after the 9 foot series resistor R58 of the data recoverer U4 with one end of capacitor C74, the other end of the capacitor C74
And be connected behind one end of connecting resistance R61 with one end of resistance R63, the other end of the resistance R63 is connected with connecting terminal J5；
It is grounded after the other end of the resistance R60 and the other end of connecting resistance R61；
It is grounded after the 3 foot series resistor R57 and capacitor C73 of the data recoverer U4.
The chip that the power module (19) uses is voltage-stablizer U8, the circuit structure of the power module (19) are as follows:
2 feet of the voltage-stablizer U8 successively and connect one end of 3 feet of voltage-stablizer U8,10 feet, 11 feet, 8 feet, capacitor C58, capacitor
It is connected behind one end of C57 with 5V input power；
9 feet of the voltage-stablizer U8 successively and connect 1 foot of voltage-stablizer U8,12 feet, 13 feet, 24 feet, 7 feet, capacitor C58 it is another
It holds, is grounded after the other end of capacitor C57；
14 feet of the voltage-stablizer U8 successively and connect defeated with 1.2V power supply behind one end of 15 feet of voltage-stablizer U8,16 feet, capacitor C60
Outlet is connected；
21 feet of the voltage-stablizer U8 successively and connect defeated with 3.3V power supply behind one end of 22 feet of voltage-stablizer U8,23 feet, capacitor C59
Outlet is connected；
It is grounded after the other end of the other end shunt-wound capacitance C60 of the capacitor C59.
The chip that the communication interface drive module (3) uses is bus extender U20, the communication interface drive module
(3) circuit structure are as follows:
Signal output end phase after 2 feet of the bus extender U20 and one end of connecting resistance R40 with data communication module (15)
Even, another termination 3.3V input power of the resistance R40；
3 feet of the bus extender U20 are connected with the signal output end of data communication module (15)；
4 feet of the bus extender U20 are grounded；
6 feet of the bus extender U20 are connected with the signal input part of data receiving and transmitting controller (16)；
Signal input part after 7 feet of the bus extender U20 and one end of connecting resistance R42 with data receiving and transmitting controller (16)
It is connected, another termination 3.3V input power of the resistance R42；
One end of the 8 foot shunt-wound capacitance C48 of the bus extender U20, behind one end of capacitor C49 with 3.3V power input phase
Even, it is grounded after the other end of the other end shunt-wound capacitance C49 of the capacitor C48.
The model DS921V1023ARHBQ of the signal transmission chip U1；
The model CLC001 of the cable driver U2；
The model DS921V1224ARHBQ of the signal receiving chip U3；
The model CLC014 of the data recoverer U4；
The model TPS70345 of the voltage-stablizer U8；
The model P82B715 of the bus extender U20.
Present invention introduces acquisitions and transmission that picogram bus transfer agreement carries out pressure data, compared to original measurement system
System can eliminate terminal user's technology barrier, reduce measuring and design workload, reduce measuring system relevant device, simplify cable
Net effectively improves system reliability；The digital pressure sensor used will simplify measuring system after having picogram bus interface.
The present invention includes shell and pressure ring, is equipped with pressure sensor and related circuit in the cavity that shell and pressure ring are formed
Plate, pressure sensor and shell are welded together by welding ring, and communication interface driving circuit is provided on the circuit board；
Temperature sensor is integrated into pressure sensor by the present invention simultaneously, the temperature of pressure sensor probe can be measured, by micro-
Controller, which sends instruction, can control sensor acquisition pressure value or temperature value, in conjunction with calibration factor stored in memory,
To calibrate to pressure value, the measurement accuracy of pressure signal at different temperatures is improved；Sensing can be realized by configuring
The different over-sampling rate of device adjusts acquisition precision and power consumption, adapts to various applications.
In the present embodiment, the I2C digital signal output cable being arranged on the outside of the pressure ring is connect with control circuit board, due to
The present invention provides a kind of micro energy lose serial digital communications interface, can the long-term work in the case where 3.3V powers, string
Row digital communication improves the reliability of signal.
The pressure sensor probe is external to be equipped with waterproof gasket cement, is equipped in the gap among the circuit board and top cover
Insulated enclosure filled layer enables to bear biggish pressure to realize to the protection of pressure sensor probe and circuit board,
It being capable of steady operation under severe conditions.
The sensor transducer is internally provided with data transmit-receive module and power module, and data transmit-receive module completes order
Parsing forwarding and data upload function, including picogram bus interface circuit, further include communication interface driving circuit and digital pressure
Driving circuit in sensor, collectively forms complete communication bus, and power module is all digital sensors and data transmit-receive
Module for power supply.
MEMS pressure sensor and communication interface driving circuit, institute are provided in the cavity that the shell and top cover are formed
State pressure sensor inside be integrated with presser sensor head, temperature sensing head, gating switch, analog-to-digital conversion module, 128 PROM,
Microprocessor and communication interface driving circuit, communication interface driving circuit substantially prolong the communication distance of I2C bus, are multichannel
It the distribution of sensor and provides convenience with the connection of sensor transducer.
When in use, the gating switch that sensor transducer can control sensor internal by sending different instructions connects
Logical presser sensor head or temperature sensing head, selected sensing head acquire data under instruction control, and acquisition signal passes through mould
The digital signal that 24 uncompensated pressure values or temperature value are formed after number module processing, by communication interface in I2C bus
Upper output.
Sensor reads 128 PROM data in pressure sensor by instruction, constitutes 7 pressure calibration values and 3 temperature
Calibration value is spent, is calculated with 24 pressure values and temperature value, obtains high-precision pressure data.
Sensor transducer is capable of the order of receiving router forwarding, parses and is transmitted to digital pressure sensor, control
The over-sampling rate of sensor, sampling interval；Wherein communication interface drive module can be logical with 48 railway digital pressure sensors simultaneously
Letter, and multichannel data is encoded according to the interface communications protocol of picogram bus and is packaged, routing is uploaded to by picogram bus interface
Device is to analyze.
Due to all devising communication interface driving circuit in digital pressure sensor and sensor transducer, greatly increase
The effective propagation path of I2C bus is provided convenience for a large amount of be routed of multiple sensors is arranged；Communication interface drive module
In P82B715 chip be two-way circuit gain buffer, the cable load capacitor in I2C bus can be made to increase, pass through choosing
Suitable pull-up resistor is taken to ensure rise time of signal in allowed limits, to improve digital pressure sensor acquisition number
According to the reliability in transmission process.
The I2C bus that the present invention uses is a kind of bidirectional two-line synchronous serial bus, wherein serial data line and serial
Clock line is all two-way I/O line, and interface circuit is open-drain output, the electric current very little of consumption, therefore the device that can be extended in bus
Number of packages amount and maximum communication distance are mainly determined that the increase of load capacitance can make the rising of signal by the capacitive load in bus
Time increases, and causes error code；The load capacity of I2C bus is 400pF under normal circumstances, and the equivalent capacity in bus is transmission line
On capacitor with the sum of 10 times of node device equivalent capacity, transmission range increase by 1 meter, thus equivalent capacity increase about 100pF may be used
See that the transmission range of I2C bus is very short；The negative of bus can be made by increasing I2C bus extender P82B715 in each bus interface
Loading capability is increased to 3000pF, and transmission range is made, without departing from the load capacity of bus, to be easy to implement large area wiring when increasing.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (5)
1. a kind of pressure data acquisition system based on picogram bus transfer agreement, it is characterised in that: sensed including digital pressure
Device (1) and sensor transducer (2), the sensor transducer (2) are pressed by communication interface drive module (3) and multiple numbers
Force snesor (1) is connected；
The digital pressure sensor (1) is made of shell (4), and one end of the shell (4) is encapsulated by waterproof gasket cement (5),
The other end of the shell (4) is encapsulated by pressure ring (6) and top cover (7)；
The shell (4) is internally provided with control circuit board (8), the space between the control circuit board (8) and shell (4)
It is filled by insulated enclosure layer (9)；
The control circuit board (8) is fixed on the inside of shell (4) by welding ring (10)；
It is integrated with microcontroller (11) on the control circuit board (8), the microcontroller (11) passes through analog-to-digital conversion module
(12) it is connected respectively with pressure sensor (13), temperature sensor (14)；
The microcontroller (11) is also bi-directionally connected by conducting wire with data communication module (15), the data communication module (15)
It is bi-directionally connected by conducting wire and sensor transducer (2)；
The sensor transducer (2) is internally provided with data receiving and transmitting controller (16), the data receiving and transmitting controller (16)
Signal output end be bi-directionally connected with communication interface drive module (3), the communication interface drive module (3) pass through conducting wire and number
It is connected according to communication module (15)；
The signal input part of the data receiving and transmitting controller (16) is bi-directionally connected with picogram bus communication module (17)；
The picogram bus communication module (17) is connected by conducting wire with router (18)；
The power input of the microcontroller (11) and data receiving and transmitting controller (16) is connected with power module (19) respectively.
2. a kind of pressure data acquisition system based on picogram bus transfer agreement according to claim 1, feature exist
In: the chip that the picogram bus communication module (17) uses is signal transmission chip U1, cable driver U2, signal receive core
Piece U3, data recoverer U4, the circuit structure of the picogram bus communication module (17) are as follows:
- 11 foot of 1 foot of the signal transmission chip U1 is connected with the signal input part of data receiving and transmitting controller (16)；
It is grounded after the 30 foot series resistor R17 of the signal transmission chip U1；
It is grounded after the 31 foot series resistor R18 of the signal transmission chip U1；
It is grounded after the 18 foot series resistor R20 of the signal transmission chip U1；
It is grounded after the 23 foot series resistor R19 of the signal transmission chip U1；
One end of 21 feet of the signal transmission chip U1 and connecting resistance R22, one end of resistance R25, behind one end of resistance R26 with
2 feet of cable driver U2 are connected；
One end of 20 feet of the signal transmission chip U1 and connecting resistance R22, one end of resistance R23, behind one end of resistance R24 with
3 feet of cable driver U2 are connected；
16 feet of the signal transmission chip U1 successively and connect 25 feet of signal transmission chip U1,26 feet, 27 feet, 28 feet, 29 feet,
One end of capacitor C46, one end of capacitor C47 are connected behind one end of capacitor C48 with 3.3V input power, the capacitor C46,
The other end of C47, C48 are grounded after being connected with each other；
It is connected after the other end of the resistance R23 and the other end of connecting resistance R25 with 3.3V input power；
It is grounded after the other end of the resistance R24 and the other end of connecting resistance R26；
It is grounded after the 4 foot series resistor R27 of the cable driver U2；
It is connected behind 7 feet of the cable driver U2 and one end of connecting resistance R29 with one end of capacitor C51, the capacitor C51's
The other end is connected with connecting terminal J5；
It is connected behind 6 feet of the cable driver U2 and one end of connecting resistance R28 with one end of capacitor C50, the capacitor C50's
The other end is connected with connecting terminal J5；
The other end of the resistance R28 and resistance R29 is grounded after being connected with each other；
- 18 foot of 14 foot of the signal receiving chip U3, the signal output end phase of -27 foot of 23 foot and data receiving and transmitting controller (16)
Even；
4 feet of the signal receiving chip U3 are simultaneously connected after connecing 5 feet of signal receiving chip U3 with one end of resistance R47, described
The other end of resistance R47 is connected with 3.3V input power；
1 foot, 8 feet, 9 feet, 22 feet, 20 feet of the signal receiving chip U3 are connected with 3.3V input power respectively；
One end of 2 feet of the signal receiving chip U3 and connecting resistance R50, one end of resistance R54, behind one end of resistance R53 with
One end of capacitor C66 is connected, 13 feet after the other end of the capacitor C66 and one end of connecting resistance R55 with data recoverer U4
It is connected；
The other end of 3 feet of the signal receiving chip U3 and connecting resistance R50, one end of resistance R51, behind one end of resistance R52
Be connected with one end of capacitor C67, behind one end of the other end of the capacitor C67 and connecting resistance R56 with data recoverer U4 14
Foot is connected；
It is connected after the other end of the resistance R51 and the other end of connecting resistance R53 with 3.3V input power, the resistance R52's
It is grounded after the other end of the other end and connecting resistance R54, the other end of the resistance R55 and the other end of connecting resistance R56, diode
One end of capacitor C68 is connected after after the cathode of D4, the other end ground connection of the capacitor C68；
It is connected after the 7 foot serial capacitance C69 of the data recoverer U4 with 6 feet of data recoverer U4；
The anode of the diode D4 and the one end for connecing 4 feet of data recoverer U4,1 foot, 2 feet, capacitor C70, the one of capacitor C72
It is connected behind end with 5V input power, is grounded after the other end of the other end shunt-wound capacitance C72 of the capacitor C70；
12 feet of the data recoverer U4 are simultaneously connected after connecing 5 feet of data recoverer U4 with one end of capacitor C71, the capacitor
The other end of C71 is grounded；
It is connected after the 8 foot series resistor R59 of the data recoverer U4 with one end of capacitor C75, the other end of the capacitor C75
And be connected behind one end of connecting resistance R60 with one end of resistance R62, the other end of the resistance R62 is connected with connecting terminal J5；
It is connected after the 9 foot series resistor R58 of the data recoverer U4 with one end of capacitor C74, the other end of the capacitor C74
And be connected behind one end of connecting resistance R61 with one end of resistance R63, the other end of the resistance R63 is connected with connecting terminal J5；
It is grounded after the other end of the resistance R60 and the other end of connecting resistance R61；
It is grounded after the 3 foot series resistor R57 and capacitor C73 of the data recoverer U4.
3. a kind of pressure data acquisition system based on picogram bus transfer agreement according to claim 2, feature exist
In: the chip that the power module (19) uses is voltage-stablizer U8, the circuit structure of the power module (19) are as follows:
2 feet of the voltage-stablizer U8 successively and connect one end of 3 feet of voltage-stablizer U8,10 feet, 11 feet, 8 feet, capacitor C58, capacitor
It is connected behind one end of C57 with 5V input power；
9 feet of the voltage-stablizer U8 successively and connect 1 foot of voltage-stablizer U8,12 feet, 13 feet, 24 feet, 7 feet, capacitor C58 it is another
It holds, is grounded after the other end of capacitor C57；
14 feet of the voltage-stablizer U8 successively and connect defeated with 1.2V power supply behind one end of 15 feet of voltage-stablizer U8,16 feet, capacitor C60
Outlet is connected；
21 feet of the voltage-stablizer U8 successively and connect defeated with 3.3V power supply behind one end of 22 feet of voltage-stablizer U8,23 feet, capacitor C59
Outlet is connected；
It is grounded after the other end of the other end shunt-wound capacitance C60 of the capacitor C59.
4. a kind of pressure data acquisition system based on picogram bus transfer agreement according to claim 3, feature exist
In: the chip that the communication interface drive module (3) uses is bus extender U20, the communication interface drive module (3)
Circuit structure are as follows:
Signal output end phase after 2 feet of the bus extender U20 and one end of connecting resistance R40 with data communication module (15)
Even, another termination 3.3V input power of the resistance R40；
3 feet of the bus extender U20 are connected with the signal output end of data communication module (15)；
4 feet of the bus extender U20 are grounded；
6 feet of the bus extender U20 are connected with the signal input part of data receiving and transmitting controller (16)；
Signal input part after 7 feet of the bus extender U20 and one end of connecting resistance R42 with data receiving and transmitting controller (16)
It is connected, another termination 3.3V input power of the resistance R42；
One end of the 8 foot shunt-wound capacitance C48 of the bus extender U20, behind one end of capacitor C49 with 3.3V power input phase
Even, it is grounded after the other end of the other end shunt-wound capacitance C49 of the capacitor C48.
5. a kind of pressure data acquisition system based on picogram bus transfer agreement according to claim 4, feature exist
In: the model DS921V1023ARHBQ of the signal transmission chip U1；
The model CLC001 of the cable driver U2；
The model DS921V1224ARHBQ of the signal receiving chip U3；
The model CLC014 of the data recoverer U4；
The model TPS70345 of the voltage-stablizer U8；
The model P82B715 of the bus extender U20.
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Application publication date: 20190621 |