CN110221559A - Pin multiplexing circuit and its control method - Google Patents
Pin multiplexing circuit and its control method Download PDFInfo
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- CN110221559A CN110221559A CN201910503330.5A CN201910503330A CN110221559A CN 110221559 A CN110221559 A CN 110221559A CN 201910503330 A CN201910503330 A CN 201910503330A CN 110221559 A CN110221559 A CN 110221559A
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- pin
- switching
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21119—Circuit for signal adaption, voltage level shift, filter noise
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Theoretical Computer Science (AREA)
- Electronic Switches (AREA)
Abstract
The invention discloses the control methods of a kind of pin multiplexing circuit and pin multiplexing circuit, pin multiplexing circuit, including control module, control module has the first pin, pin multiplexing circuit further includes the switching circuit of the first filter circuit for receiving the first sampled signal, the switching signal for receiving the second filter circuit of the second sampled signal and receiving control module output, the switching circuit according to the switching signal that the control module export come so that first sampled signal, second sampled signal switching into first pin.Present invention can ensure that the first sampled signal and the second sampled signal are alternately sampled and are handled, and the two is not interfere with each other, operation and control can independently be carried out, a pin is enabled to acquire two different amounts, one piece of control module is set to sample more amounts in this way, cost is effectively saved, is solved when the amount for needing to sample is excessive, the not enough problem of the first pin of control module.
Description
Technical field
The present invention relates to the control methods of a kind of pin multiplexing circuit and pin multiplexing circuit.
Background technique
In closed-loop control system, current output actual value, needs to sample output signal in order to obtain.Control
There are a certain number of sampling pins in module, it, will when the quantity for needing to sample is greater than the sampling pin number of control module
There is the not enough situation of sampling pin, therefore, in order to guarantee that system can work normally, it would be highly desirable to which designing one kind can be one
Sampling pin removes the circuit of two different amounts of acquisition.
Summary of the invention
The purpose of the present invention is to provide the control methods of a kind of pin multiplexing circuit and pin multiplexing circuit, enable to
One pin can acquire two different amounts.
The technical solution of the present invention is as follows: providing a kind of pin multiplexing circuit, including control module, the control module has
First pin, the pin multiplexing circuit further include the first filter circuit for receiving the first sampled signal, receive the second sampling letter
Number the second filter circuit and receive control module output switching signal switching circuit, the switching circuit according to
The switching signal of the control module output comes the entrance institute so that first sampled signal, second sampled signal switching
State the first pin.
First filter circuit includes the resistance R1 and capacitor C1 being connected in series, the first pin connection resistance R1 with
Node between capacitor C1.
Second filter circuit includes the resistance R2 and capacitor C2 being connected in series, the first pin connection resistance R2 with
Node between capacitor C2.
The switching signal includes high level and low level, the low electricity that the switching circuit is exported according to the control module
It puts down and comes so that first sampled signal enters first pin；The height that the switching circuit is exported according to the control module
Level comes so that second sampled signal enters first pin.
The switching signal includes high level and low level, the low electricity that the switching circuit is exported according to the control module
It puts down and comes so that second sampled signal enters first pin；The height that the switching circuit is exported according to the control module
Level comes so that first sampled signal enters first pin.
The switching circuit includes triode Q1, triode Q2, triode Q3 and resistance R3, in which:
The base stage of triode Q1 connects the control module, and the collector of triode Q1 connects the first filter circuit, triode Q1
Emitter ground connection, first filter circuit by triode Q1 flow direction ground；
The base stage of triode Q2 connects the control module, and the collector of triode Q2 is grounded by resistance R3, triode Q2's
Emitter connects power supply；
Node between the base stage connection resistance R3 and the collector of triode Q2 of triode Q3, the collector connection of triode Q3
Second filter circuit, the emitter ground connection of triode Q3, second filter circuit pass through triode Q3 flow direction ground.
The present invention also provides a kind of control method of pin multiplexing circuit, the pin multiplexing circuit is described above draws
Foot multiplex circuit, the control method comprising steps of
Control module exports switching signal to switching circuit, and the switching circuit receives the switching signal of the control module output
Come so that first sampled signal, second sampled signal switching into first pin.
First sampled signal, second sampled signal switching into first pin the following steps are included:
After the k-th sampling period, the K+1 sampling period is carried out；
The switching that the control module exports the switching signal that the K+1 sampling period exports relative to the k-th sampling period
Signal negates；
The switching circuit is according to negated switching signal come so that first sampled signal or second sampled signal
Into first pin.
The switching signal includes high level and low level, if negated switching signal is low level, the switching electricity
Road makes first sampled signal enter first pin, if negated switching signal is high level, the switching electricity
Road makes second sampled signal enter first pin.
The switching signal includes high level and low level, if negated switching signal is high level, the switching electricity
Road makes first sampled signal enter first pin, if negated switching signal is low level, the switching electricity
Road makes second sampled signal enter first pin.
Present invention can ensure that the first sampled signal and the second sampled signal are alternately sampled and handled, and the two is mutual
It does not interfere, can independently carry out operation and control, a pin is enabled to acquire two different amounts, make one piece of control mould in this way
Block can sample more amounts, effectively saving cost, solve when the amount for needing to sample is excessive, the first pin of control module is inadequate
The problem of using.
Detailed description of the invention
Fig. 1 is the schematic diagram of pin multiplexing circuit in the present invention.
Fig. 2 is the flow chart of the control method of pin multiplexing circuit in the present invention.
Specific embodiment
As shown in Figure 1, the pin multiplexing circuit proposed in the embodiment of the present invention, including control module 10, control module 10
With the first pin and second pin, the first pin is sampling pin, and second pin is output pin.Pin multiplexing circuit also wraps
Include the first filter circuit 20, the second filter circuit 30 and switching circuit 40, the first filter circuit 20, the second filter circuit 30 and control
First pin of molding block 10 connects, and switching circuit 40 is connect with the second pin of control module 10.First filter circuit 20 is used
In receiving the first sampled signal, the second filter circuit 30 is for receiving the second sampled signal, and switching circuit 40 is for receiving control
The switching signal that module 10 exports, switching circuit 40 is according to the switching signal that control module 10 exports come so that the first sampling is believed
Number, the first pin of entrance of the second sampled signal switching, it is ensured that the first sampled signal and the second sampled signal alternately into
Row sampling and processing, enable a pin to acquire two different amounts.
In the present embodiment, control module is a chip.
First filter circuit 20 includes the resistance R1 and capacitor C1 being connected in series, and the first pin connects resistance R1 and capacitor C1
Between node, capacitor C1 ground connection.Second filter circuit 30 includes that the resistance R2 being connected in series and capacitor C2, the first pin also connect
Node between connecting resistance R2 and capacitor C2, capacitor C2 ground connection.
In the present embodiment, resistance R1 has the first connecting pin and second connection end, and capacitor C1 has the first connecting pin and the
Two connecting pins, the first sampled signal are inputted from the first connecting pin of resistance R1, the second connection end connection capacitor C1's of resistance R1
First connecting pin, the second connection end ground connection of capacitor C1.Resistance R2 has the first connecting pin and second connection end, and capacitor C2 has
First connecting pin and second connection end, the second sampled signal are inputted from the first connecting pin of resistance R2, the second connection of resistance R2
The first connecting pin of end connection capacitor C2, the second connection end ground connection of capacitor C2.
Switching circuit 40 includes triode Q1, triode Q2, triode Q3 and resistance R3, and the base stage of triode Q1 connects control
Molding block, the collector of triode Q1 connect (the first connection of the collector connection resistance R1 of triode Q1 of the first filter circuit
End), the emitter ground connection of triode Q1, the first filter circuit passes through triode Q1 flow direction ground.The base stage of triode Q2 connects control
The collector of molding block, triode Q2 is grounded by resistance R3, and the emitter of triode Q2 connects power supply.The base stage of triode Q3 connects
The collector of node between connecting resistance R3 and the collector of triode Q2, triode Q3 connects the second filter circuit (resistance R1
The first connecting pin resistance R2 the first connecting pin), the emitter of triode Q3 ground connection, the second filter circuit passes through triode Q3
Flow direction ground.
The switching signal that control module 10 exports includes high level and low level.
The working principle of the pin multiplexing circuit are as follows:
When control module 10 export switching signal be low level when, triode Q1 shutdown, the first sampled signal by resistance R1,
Enter the first pin (sampling pin for ADC) of control module after capacitor C1 filtering；And triode Q2 is connected, power supply (Vcc) warp
The base stage that triode Q2 is added in triode Q3 to be crossed, triode Q3 is connected, the second sampled signal flows to ground by triode Q3, this
Sample control module does not receive the second sampled signal, and control module acquires and handles the first sampled signal at this time.Work as control module
When the switching signal of 10 outputs is high level, triode Q1 is switched on, and the first sampled signal is by triode Q1 flow direction ground, control
Module does not receive the first sampled signal；And triode Q2 is in an off state, the base stage of triode Q3 is by resistance R3(resistance R3
For pull down resistor) drop-down be low level, triode Q3 is in an off state, the second sampled signal by R2, capacitor C2 filter after
Into the first pin of control module, control module acquires and handles the second sampled signal at this time.It can guarantee that first adopts in this way
Sample signal and the second sampled signal are alternately sampled and are handled, and first pin is enabled to acquire two different amounts.
In other embodiments, switching circuit can also be according to the low level that control module exports come so that the second sampling is believed
Number enter the first pin (i.e. control module acquires and handles the second sampled signal)；Switching circuit can also be defeated according to control module
High level out comes so that the first sampled signal enters the first pin (i.e. control module acquires and handles the first sampled signal).
Such as Fig. 2, the present invention also provides a kind of control method of pin multiplexing circuit, control method comprising steps of
Control module exports switching signal to switching circuit, and the switching signal that switching circuit receives control module output is come so that the
The first pin of entrance that one sampled signal, the second sampled signal switch, it is ensured that the first sampled signal and the second sampled signal
It is alternately sampled and is handled, first pin is enabled to acquire two different amounts.
First sampled signal, the second sampled signal switching entrance the first pin the following steps are included:
After the k-th sampling period；
Carry out the K+1 sampling period；
The switching signal that control module exports the switching signal that the K+1 sampling period exports relative to the k-th sampling period
It negates；
Switching circuit is according to negated switching signal come so that the first sampled signal or the second sampled signal enter described first
Pin.
Switching signal includes high level and low level, if negated switching signal is low level, switching circuit makes the
One sampled signal enter the first pin, if negated switching signal be high level, switching circuit make the second sampled signal into
Enter the first pin.
For example, the switching signal that control module exports in the 1st sampling period is high level, control module is acquired and is handled
Second sampled signal；After 1st sampling period, the 2nd sampling period is carried out, control module is defeated by the 2nd sampling period
Switching signal out is low level (negating), and control module acquires and handles the first sampled signal；2nd sampling period terminates
Afterwards, it carries out the 3rd sampling period, the switching signal that control module exports the 3rd sampling period is high level (negating), control
Molding block acquires and handles the second sampled signal, so recycles.
In other embodiments, if negated switching signal be high level, switching circuit make the first sampled signal into
Enter the first pin, i.e. control module acquires and handles the first sampled signal；If negated switching signal is low level, switching electricity
Road makes the second sampled signal enter the first pin, i.e. control module acquires and handles the second sampled signal.
For example, the switching signal that control module exports in the 1st sampling period is bottom level, control module is acquired and is handled
First sampled signal；After 1st sampling period, the 2nd sampling period is carried out, control module is defeated by the 2nd sampling period
Switching signal out is high level (negating), and control module acquires and handles the second sampled signal；2nd sampling period terminates
Afterwards, it carries out the 3rd sampling period, the switching signal that control module exports the 3rd sampling period is low level (negating), control
Molding block acquires and handles the first sampled signal, so recycles.
The pin multiplexing circuit and its control method proposed in the present invention can guarantee the first sampled signal and the second sampling
Signal is alternately sampled and is handled, and the two is not interfere with each other, and can independently carry out operation and control, enables a pin
Two different amounts are acquired, one piece of control module is allow to sample more amounts in this way, effectively saving cost, solve to adopt when needs
When the amount of sample is excessive, the not enough problem of control module pin.
Above specific embodiment is only to the design illustrated the present invention, and those skilled in the art are in this hair
Various deformation and variation can be made under bright design, these deformations and variation are included within protection scope of the present invention.
Claims (10)
1. a kind of pin multiplexing circuit, including control module (10), the control module (10) has the first pin, and feature exists
In the pin multiplexing circuit further includes the first filter circuit (20) for receiving the first sampled signal, receives the second sampled signal
The second filter circuit (30) and receive the control module (10) output switching signal switching circuit (40), it is described to cut
Circuit (40) is changed according to the switching signal that the control module (10) exports come so that first sampled signal, described second adopting
The switching of sample signal into first pin.
2. pin multiplexing circuit according to claim 1, which is characterized in that first filter circuit (20) includes series connection
Node between the resistance R1 and capacitor C1, the first pin connection resistance R1 and capacitor C1 of connection.
3. pin multiplexing circuit according to claim 1 or 2, which is characterized in that second filter circuit (30) includes
Node between the resistance R2 and capacitor C2, the first pin connection resistance R2 and capacitor C2 of series connection.
4. pin multiplexing circuit according to claim 1, which is characterized in that the switching signal includes high level and low electricity
Flat, the switching circuit (40) is according to the low level that the control module (10) exports come so that first sampled signal enters
First pin；The switching circuit (40) is according to the high level that the control module (10) exports come so that described second adopts
Sample signal enters first pin.
5. pin multiplexing circuit according to claim 1, which is characterized in that the switching signal includes high level and low electricity
Flat, the switching circuit (40) is according to the low level that the control module (10) exports come so that second sampled signal enters
First pin；The switching circuit (40) is according to the high level that the control module (10) exports come so that described first adopts
Sample signal enters first pin.
6. pin multiplexing circuit according to claim 1, which is characterized in that the switching circuit (40) includes triode
Q1, triode Q2, triode Q3 and resistance R3, in which:
The base stage of triode Q1 connects the control module (10), and the collector of triode Q1 connects the first filter circuit, three poles
The emitter of pipe Q1 is grounded, and first filter circuit passes through triode Q1 flow direction ground；
The base stage of triode Q2 connects the control module (10), and the collector of triode Q2 is grounded by resistance R3, triode
The emitter of Q2 connects power supply；
Node between the base stage connection resistance R3 and the collector of triode Q2 of triode Q3, the collector connection of triode Q3
Second filter circuit, the emitter ground connection of triode Q3, second filter circuit pass through triode Q3 flow direction ground.
7. a kind of control method of pin multiplexing circuit, which is characterized in that the pin multiplexing circuit is in claim 1 to 6
Described in any item pin multiplexing circuits, the control method comprising steps of
Control module exports switching signal to switching circuit, and the switching circuit receives the switching signal of the control module output
Come so that first sampled signal, second sampled signal switching into first pin.
8. the control method of pin multiplexing circuit according to claim 7, which is characterized in that first sampled signal,
Second sampled signal switching into first pin the following steps are included:
After the k-th sampling period, the K+1 sampling period is carried out；
The switching that the control module exports the switching signal that the K+1 sampling period exports relative to the k-th sampling period
Signal negates；
The switching circuit is according to negated switching signal come so that first sampled signal or second sampled signal
Into first pin.
9. the control method of pin multiplexing circuit according to claim 8, which is characterized in that the switching signal includes height
Level and low level, if negated switching signal is low level, the switching circuit enters first sampled signal
First pin, if negated switching signal is high level, the switching circuit enters second sampled signal
First pin.
10. the control method of pin multiplexing circuit according to claim 8, which is characterized in that the switching signal includes
High level and low level, if negated switching signal be high level, the switching circuit make first sampled signal into
Enter first pin, if negated switching signal be low level, the switching circuit make second sampled signal into
Enter first pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910503330.5A CN110221559A (en) | 2019-06-11 | 2019-06-11 | Pin multiplexing circuit and its control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910503330.5A CN110221559A (en) | 2019-06-11 | 2019-06-11 | Pin multiplexing circuit and its control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110632379A (en) * | 2019-10-30 | 2019-12-31 | 四川中微芯成科技有限公司 | Motor-controlled single-resistor sampling method |
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