CN103676729A - Digital knob switch multiplexing device and electronic equipment using same - Google Patents
Digital knob switch multiplexing device and electronic equipment using same Download PDFInfo
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- CN103676729A CN103676729A CN201310620011.5A CN201310620011A CN103676729A CN 103676729 A CN103676729 A CN 103676729A CN 201310620011 A CN201310620011 A CN 201310620011A CN 103676729 A CN103676729 A CN 103676729A
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Abstract
The invention discloses a digital knob switch multiplexing device and electronic equipment using the same. The digital knob switch multiplexing device comprises a plurality of power supplies with different amplitude values, a digital knob switch and a processor, wherein one of the power supplies with the different amplitude values is selected to supply power for the digital knob switch by using a gating module; and the processor determines a current selected controlled object according to the power of the power supply of the digital knob switch. The controlled object required to be regulated is automatically recognized by changing the amplitude value outputted to the power supply of the digital knob switch, so that parameters of a plurality of controlled objects can be regulated by the digital knob switch. The digital knob switch multiplexing device is applied to the electronic equipment which requires to regulate the controlled objects step by step; and a circuit structure of the electronic equipment can be simplified, hardware cost is reduced, the controlled objects can be regulated by only occupying two interfaces of the processor, and the design difficulty of a circuit of a system is greatly simplified.
Description
Technical field
The invention belongs to rotary switch technical field, specifically, the electronic equipment that relates to a kind of circuit structure for digital knob switch designs and adopt this digital knob on-off circuit design.
Background technology
Digital knob switch is the hand switch that a kind of turned position by adjusting knob operates the duty of electronic equipment, be widely used at present on very eurypalynous electronic equipment, such as: can be applied on the audio output apparatus such as sound equipment, radio, intercom, for regulating the volume of microphone or loudspeaker; Be applied on the light fixture such as desk lamp, electric torch, can realize the effective adjusting to brightness of illumination; Be applied on some display device, can realize the manual adjustments to picture brightness; Etc..
The control mode that this employing digital knob switch carries out multistage adjusting or regulates continuously controlled device (such as volume, brightness etc.), it is in circuit structure design, all to be adopted as a rotary switch of each controlled device configuration at present, and the mode that takies the two-way GPIO mouth of processor designs, by detecting the phase differential of its two-way GPIO mouth, to identify knob be forward or reversion to processor, thereby realize the manual adjustments to controlled devices such as volume, illumination intensity, picture brightness.
Obviously, the control circuit of this conventional needle to digital rotary switch design, in the time of on being applied to some electronic equipment that self just requires multiple (representing by N kind below) controlled device to regulate, just need in this class of electronic devices, configure N rotary switch, and need to take processor 2N road GPIO mouth in electronic equipment, complete and wait to adjust the detecting of application and parameter to regulate to N kind.This not only can cause the rising of electronic equipment hardware cost, the increase of volume, and need to take a large amount of interface resources of processor, this can increase the design difficulty of circuit system undoubtedly for some interface resource processor relatively in short supply.
Summary of the invention
The present invention is in order to solve the existing control circuit for digital knob switch designs, a rotary switch can only regulate a controlled device, function singleness, the problem that resource occupation amount is large, a kind of digital knob switch multiplexing device has been proposed, realized multiplexing to a digital knob switch of multiple controlled device, circuit design is simple, has significantly saved resource.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A digital knob switch multiplexing device, comprises power supply, digital knob switch and the processor of the different amplitudes of multichannel; It is that digital knob switch is powered that the power supply of the different amplitudes of described multichannel is selected a wherein road power supply by gating device, and described processor is according to the controlled device of the power supply size judgement current selected of digital knob switch.
Further, described processor connects sense terminal and the state end of digital rotary switch, select wherein a road power supply by gating device after and before digital knob switch rotates, processor, by detecting the voltage magnitude of described sense terminal or state end, judges the controlled device of current selected.
Preferably, the state end of described digital knob switch connects the ADC interface of processor, and sense terminal connects the GPIO mouth of processor; Processor is by detecting the controlled device of the magnitude of voltage judgement current selected of its ADC interface conversion output, by detecting the low and high level state of GPIO mouth described in it, judges whether digital knob switch rotates.
Further again, described processor, according to the phase differential between the state end of digital knob switch and sense terminal, judges the rotation direction of digital knob switch, and then regulates the parameter value of controlled device increase or reduce according to rotation direction.
In order to simplify circuit design, at described power supply, comprise the highest direct supply of a road voltage magnitude, all the other each road power supplies generate via the conversion of bleeder circuit dividing potential drop by the highest direct supply of this road voltage magnitude.
Further, by described bleeder circuit dividing potential drop conversion, generate Ge road power supply and via a road anti-back flow circuit, export separately the feeder ear of digital knob switch to.
When described controlled device is two kinds, described gating device can adopt a keyswitch to carry out circuit design, and described keyswitch is connected between the direct supply and the feeder ear of digital knob switch that described voltage magnitude is the highest; Described bleeder circuit is connected between the direct supply and ground that voltage magnitude is the highest, and dividing potential drop node connects the feeder ear of described digital knob switch.
When described controlled device is two kinds or when two or more, described gating device can adopt a single pole multiple throw to carry out circuit design, the common port of described single pole multiple throw is connected to the highest direct supply of described voltage magnitude, wherein a road gating end directly connects the feeder ear of described digital knob switch, each road gating end is separately by a component volt circuit ground connection in addition, and the dividing potential drop node of each component volt circuit connects the feeder ear of described digital knob switch separately; Or described bleeder circuit Wei Yi road has the circuit of a plurality of dividing potential drop nodes, one end connects the highest direct supply of described voltage magnitude, other end ground connection, the common port of described single pole multiple throw connects the feeder ear of described digital knob switch, and each road gating end correspondingly gating connects each dividing potential drop node.
Preferably, the direct supply that described voltage magnitude is the highest is by filter capacitor ground connection, to improve the stability of described direct supply.
Based on above-mentioned digital knob switch multiplexing device, the invention allows for a kind of electronic equipment that adopts described digital knob switch multiplexing device design, comprise power supply, digital knob switch and the processor of the different amplitudes of multichannel; It is that digital knob switch is powered that the power supply of the different amplitudes of described multichannel is selected a wherein road power supply by gating device, and described processor is according to the controlled device of the power supply size judgement current selected of digital knob switch.Thus, only need to use a digital rotary switch can meet the parameter regulatory demand of multiple controlled device.
Compared with prior art, advantage of the present invention and good effect are: the present invention exports the amplitude of the power supply of digital knob switch to by change, realize the automatic identification to the current controlled device that will regulate, make thus multiple controlled device can share a digital rotary switch and carry out parameter adjusting, be applied in the electronic equipment that need to regulate step by step multiple controlled device, not only can simplify the circuit structure of electronic equipment, reduce hardware cost, save the space of electronic equipment; And in circuit design, only need the two-way interface resource that takies processor can complete the adjusting task to multiple controlled device, significantly saving on the basis of processor interface resource, simplified the cabling design of PCB, especially be applicable to being applied in the circuit system design that the interface resource of processor is relatively in short supply, to simplify the difficulty of circuit system design.
Read by reference to the accompanying drawings after the detailed description of embodiment of the present invention, it is clearer that the other features and advantages of the invention will become.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of a kind of embodiment of digital knob switch multiplexing device proposed by the invention;
Fig. 2 is the circuit theory diagrams of another embodiment of digital knob switch multiplexing device proposed by the invention;
Fig. 3 is the circuit theory diagrams of another embodiment of digital knob switch multiplexing device proposed by the invention;
When Fig. 4 is the right-hand rotation of digital knob switch, the level of A, two ports of B changes sequential chart;
When Fig. 5 is the left-hand rotation of digital knob switch, the level of A, two ports of B changes sequential chart.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in more detail.
The digital knob switch multiplexing device of the present embodiment regulates the compatibility of N kind controlled device (such as volume, brightness etc.) in order to realize a digital knob switch, first in circuit design, for digital knob switch provides the power supply of the different amplitudes of multichannel, the corresponding controlled device of each road power supply.Utilize gating device between the power supply of described Ge road, to select to switch, according to the current controlled device that needs adjusting of user, gating with it corresponding Yi road power supply is the power supply of digital knob switch.Then, utilize processor to detect the power supply that is applied to digital knob switch, according to detected power supply size, which controlled device what just can identify current needs adjusting is, and then according to the sense of rotation of digital knob switch, the parameter of this controlled device is carried out step by step or regulated continuously.
For described multiple-way supply power supply, take N road to describe as example, described N is greater than 1 natural number, both can adopt N road independently direct supply directly provide; Also can adopt on the power panel in digital knob switch multiplexing device voltage stabilizing chip in N-1 road is set, utilize voltage stabilizing chip to carry out voltage stabilizing conversion to the wherein road direct supply in device, to generate the required different power supply of all the other N-1 road voltage magnitudes.For front a kind of design proposal, be only applicable to device self and possessed the situation of multi-channel dc power supply, utilizing the existing direct supply in each road is directly the power supply of digital knob switch, it in circuit design, is obviously simple economy, but, can provide at present the electronic equipment of multi-channel DC power supply rare after all, so its suitable application area is more limited simultaneously.For installing the situation that self only there is a road or be less than N road direct supply, if adopt above-mentioned rear a kind of design proposal, can cause undoubtedly the rising of whole circuit cost, the increase of pcb board area occupied.In order to address this problem, the present embodiment proposes to adopt the mode of design bleeder circuit, selecting arrangement Zhong No. mono-direct supply VDD connects described bleeder circuit, utilize bleeder circuit Dui Gai road direct supply VDD to carry out dividing potential drop conversion, and then generate remaining N-1 road power supply, to meet design requirement.
Obviously, by bleeder circuit, convert output Ge road power supply, its amplitude is certainly lower than described direct supply VDD, as long as bleeder circuit is reasonably configured, make the voltage magnitude of its output N-1 road power supply different, and each road power supply can meet the power requirement of digital knob switch, coordinate so direct supply VDD, can be digital knob switch provides the power supply of the different amplitudes in N road, meeting under the prerequisite that N kind controlled device is accurately identified the integrated circuit structure of simplification device.Bleeder circuit can be in series by resistance, also can be in series by resistance and stabilivolt.The node of series connection is dividing potential drop output terminal, the power supply of output respective magnitudes.
Below in conjunction with Fig. 1 to Fig. 3, set forth respectively concrete assembling structure and the principle of work thereof of two kinds of digital knob switch multiplexing circuit.
Shown in Figure 1, for controlled device, only have the situation (being N=2) of two, can adopt a keyswitch S2 as described gating device, be connected between direct supply VDD and the feeder ear VCC of digital knob switch DS.The design philosophy proposing according to the present embodiment, two controlled devices need duplex feeding power supply to identify, using existing Yi road direct supply VDD in device as a road power supply wherein, so only need to design a component volt circuit described direct supply VDD is carried out to dividing potential drop conversion, can generate the second road power supply, meet design requirement.
Based on this, the present embodiment adopts two divider resistance R1, R2 to be connected to form described bleeder circuit, is connected between described direct supply VDD and ground, and direct supply VDD is carried out to dividing potential drop conversion.The anode that the dividing potential drop node of bleeder circuit (being the intermediate node of divider resistance R1, R2) is connected to a reverse-filling diode D1, the negative electrode of reverse-filling diode D1 connects the feeder ear VCC of digital rotary switch DS, by the dividing potential drop node of bleeder circuit, exporting No. second direct supply VDD1, is digital knob switch DS power supply.The earth terminal GND connecting PCB board of digital knob switch DS systematically.Reverse-filling diode D1 prevents that voltage from pouring in down a chimney, stablize the input of the feeder ear VCC of digital knob switch DS, therefore the present embodiment is not limited to the anti-back flow circuit that reverse-filling diode D1 forms, as long as can play the anti-back flow circuit of reverse-filling effect, can substitute, the anti-back flow circuit forming such as reverse-filling diode D1 can replace with the anti-back flow circuit that triode and/or metal-oxide-semiconductor etc. form.
Stable in order to make to export digital knob switch DSGe road direct supply VDD, VDD1 to, the present embodiment is also connected with filter capacitor C1 between described direct supply VDD and ground, with the noise interference in filtering supply line.
Digital knob switch DS is connected to processor MCU, by processor MCU, detect the power supply size of digital knob switch DS, and then realize the identification to current selected controlled device.In the present embodiment, described processor MCU can select one cheaply single-chip microcomputer carry out the specific design of circuit, to reduce the hardware cost of complete machine.In order further to save the interface resource of processor MCU, for the power supply size that is applied to digital knob switch DS, the present embodiment preferably adopts by detecting compatible realization of method of the state end A of digital knob switch DS or the high level amplitude of sense terminal B.Rotary state due to digital knob switch DS, need to change to realize by detecting the phase place of its state end A and sense terminal B, and by the signal of state end A and sense terminal B output, be the pulse signal of low and high level, and the amplitude of high level just equals to be input to the voltage magnitude of the power supply of digital knob switch DS.Therefore, when the connection line of design digital knob switch DS and processor MCU, only need take the two-way interface of processor MCU, the state end A and the sense terminal B that connect respectively digital rotary switch DS, can, when meeting digital rotary switch DS rotary state testing requirement, realize the detection to digital rotary switch DS power supply size.
In the present embodiment, preferably adopt processor MCU Yi road GPIO mouth (for example interrupt signal interface INT) to connect the sense terminal B of digital rotary switch DS, according to the low and high level state of sense terminal B, judge whether digital knob switch DS rotates; Selection processor MCU mono-road ADC interface connects the state end A of digital rotary switch DS, and the high level amplitude size according to state end A, judges the current controlled device of choosing.
The specific works principle of digital knob switch multiplexing device the present embodiment being proposed below in conjunction with Fig. 1 is described in detail.
Suppose that certain electronic equipment need to speaker volume and two controlled devices of picture brightness be carried out step by step or adjusting continuously, and when selecting direct supply VDD to be digital knob switch DS power supply, represent that requiring the controlled device regulating is speaker volume; When the direct supply VDD1 after selecting dividing potential drop is digital knob switch DS power supply, represent that requiring the controlled device regulating is picture brightness.
When user need to regulate the speaker volume of this electronic equipment, closed keyswitch S2, is used direct supply VDD for digital knob switch DS power supply.Due to the voltage magnitude of the voltage magnitude of the direct supply VDD direct supply VDD1 after higher than dividing potential drop, thus the anti-cut-off partially of reverse-filling diode D1, the output of blocking-up direct supply VDD1.Now, state end A and sense terminal B by digital knob switch DS export respectively high level, and amplitude equals the voltage magnitude of direct supply VDD.When the voltage magnitude that the state end A of digital knob switch DS detected by its ADC interface when processor MCU is VDD, judge that current controlled device is loudspeaker.
Afterwards, user can regulate the volume of loudspeaker by rotary digital rotary switch DS.When user rotates digital knob switch DS, the sense terminal B of digital knob switch DS can be at a time low level by high level saltus step, and then sends a look-at-me to the interrupt signal interface INT of processor MCU, makes processor MCU enter interrupt routine.In interrupt process, the level that processor MCU continues the state end A of monitoring digital knob switch DS changes, if the current potential of state end A becomes high level from low level, representative digit rotary switch DS turns right, shown in Fig. 4, now processor MCU increases by the volume of its internal processes control loudspeaker; If the current potential of state end A becomes low level from high level, representative digit rotary switch DS turns left, and shown in Fig. 5, now processor MCU reduces by the volume of its internal processes control loudspeaker, realizes thus the adjusting to speaker volume.
When user need to regulate the picture brightness of this electronic equipment, lift keyswitch S2, cut off direct supply VDD to the direct power supply of digital knob switch DS, then use, by the direct supply VDD1 exporting after bleeder circuit dividing potential drop, to digital knob switch DS, power.Now, processor MCU becomes VDD1 by detecting the voltage magnitude of its ADC interface from VDD, can judge exactly the current controlled device regulating that needs and become picture brightness.
Afterwards, the picture brightness that user just can show display screen on electronic equipment by rotary digital rotary switch DS carries out free adjustment.Concrete adjustment process is with the adjustment process of above-mentioned speaker volume, and the present embodiment is not repeated.
It is the situation of two that circuit assembling structure shown in Fig. 1 is only applicable to controlled device, surpasses the electronic equipment of two for controlled device, and the present embodiment has further proposed circuit design scheme as shown in Figure 2 and Figure 3.
For controlled device, surpass the situation of two, the present embodiment selects a single pole multiple throw S3 as described gating device, to carry out the specific design of circuit, and proposes two kinds of physical circuit set up the schemes:
The first, shown in Figure 2, the common port of single pole multiple throw S3 1 is connected to direct supply VDD, and by filter capacitor C2 ground connection, for the undesired signal in filtering direct supply VDD; The power end VCC that a wherein road gating end 4 of single pole multiple throw S3 is connected to digital knob switch DS, the earth terminal GND connecting PCB board of described digital knob switch DS is systematically; All the other each road gating ends 3,2 of single pole multiple throw S3 are passed through to a road bleeder circuit ground connection separately, each road bleeder circuit all can adopt two divider resistances to be formed by connecting, for example: adopt divider resistance R5, R6 to be connected to form the first component volt circuit, be connected to the gating end 3 of single pole multiple throw S3 and systematically between, its dividing potential drop node is by the anti-back flow circuit of reverse-filling diode D2(or other assembling structures) connect the power end VCC of digital rotary switch DS, for digital knob switch DS provides the second road power supply VDD2.In like manner, adopt divider resistance R3, R4 to be connected to form second component volt circuit, be connected to the gating end 2 of single pole multiple throw S3 and systematically between, its dividing potential drop node connects the power end VCC of digital rotary switch DS by reverse-filling diode D3, for digital knob switch DS provides Third Road power supply VDD3.In circuit design, as long as the resistance of two component volt circuits is carried out to reasonable disposition, make the partial pressure value difference by two dividing potential drop node outputs, can meet the requirement that the direct current supply of the different amplitudes of multichannel is provided to digital knob switch DS.
Circuit structure shown in Fig. 2 is used single-pole triple-throw (SPTT) switch S 3 to coordinate two component volt circuits, can provide three road power supply VDD, VDD2, VDD3 for digital knob switch DS, and then meets the adjusting requirement to three controlled devices.If the number of controlled device is more, N the controlled device of take describes as example, can select hilted broadsword N throw switch to coordinate N-1 component volt circuit, generates the power supply of the different amplitudes in N road, to meet the designing requirement of circuit.
It two is, adopts the divider resistance series connection more than two, forms the bleeder circuit that a road has a plurality of dividing potential drop nodes.As shown in Figure 3, take and select four divider resistance R7-R10 series connection to form bleeder circuit that roads have three dividing potential drop nodes to describe as example.One end of described bleeder circuit is connected to direct supply VDD, other end ground connection, three dividing potential drop nodes connect one to one with described single pole multiple throw S4 tri-road gating ends 2,3,4 respectively, the common port of single pole multiple throw S4 1 are connected to the feeder ear VCC of described digital knob switch DS.Thus, when single pole multiple throw S4Ge road gating end being selected switch, because the voltage magnitude of the power supply VDD4 exporting by the different dividing potential drop nodes of described bleeder circuit or VDD5 or VDD6 is different, therefore can meet for digital knob switch DS provides different power supplies, for the designing requirement of identification controlled device type.
When the circuit set up the scheme shown in Fig. 3 can meet controlled device and is three, the multistage adjusting of each object parameters value.Certainly, situation for controlled device more than three, only need select more divider resistance series connection to form described bleeder circuit, provide the multi channel selecting end of more dividing potential drop node and single pole multiple throw S4 to connect one to one, just can be digital knob switch DS provides the power supply of how different amplitudes, to meet the identification requirement to more controlled devices, the present embodiment is not limited in above giving an example.
In conjunction with Fig. 2, the present embodiment be take three controlled devices as example is to adopting the specific works principle of the digital knob switch multiplexing device of single pole multiple throw design to be described in detail.Suppose that three controlled devices are respectively speaker volume, earpiece volume and picture brightness.
When user need to carry out volume adjusting to the loudspeaker on electronic equipment, first single pole multiple throw S3 is switched to gating end 4, its common port 1 is communicated with gating end 4, utilize direct supply VDD directly to digital knob switch DS, to power.Now, the level magnitude that processor MCU detects the state end A of digital knob switch DS is VDD, and judging thus the current controlled device that need to regulate is loudspeaker.Afterwards, processor MCU changes by detecting the state end A of digital knob switch DS and the phase place of sense terminal B, can identify the rotation direction of digital knob switch DS, and then is become large or reduced by internal processes control loudspeaker volume.
When user need to carry out volume adjusting to the microphone on electronic equipment, single pole multiple throw S3 can be switched to gating end 3, its common port 1 is communicated with gating end 3, utilizes the direct supply VDD2 exporting after divider resistance R5, R6 dividing potential drop to power to digital knob switch DS.Now, the level magnitude that processor MCU detects the state end A of digital knob switch DS becomes VDD2, and just judging thus the current controlled device that need to regulate is microphone.Afterwards, user, by rotating digital knob switch DS, can realize the free adjustment to microphone volume.
In like manner, when user need to regulate the picture brightness of electronic equipment, only single pole multiple throw S3 need be switched to gating end 2, its common port 1 is communicated with gating end 2, utilize the direct supply VDD3 exporting after divider resistance R3, R4 dividing potential drop to power to digital knob switch DS.Now, processor MCU changes (becoming VDD3) by detecting the level of the state end A of digital knob switch DS, can judge the current controlled device regulating that needs and become picture brightness, thereby according to the rotation direction of digital knob switch DS, realize the adjusting step by step to display screen picture brightness.
For the controlled device of more number more, can copy Fig. 2 and description above to expand design, the present embodiment no longer launches explanation at this.
Certainly; above-mentioned explanation is not limitation of the present invention; the present invention is also not limited in above-mentioned giving an example, and the variation that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement, also should belong to protection scope of the present invention.
Claims (10)
1. a digital knob switch multiplexing device, is characterized in that: the power supply, digital knob switch and the processor that comprise the different amplitudes of multichannel; It is that digital knob switch is powered that the power supply of the different amplitudes of described multichannel is selected a wherein road power supply by gating device, and described processor is according to the controlled device of the power supply size judgement current selected of digital knob switch.
2. digital knob switch multiplexing device according to claim 1, it is characterized in that: described processor connects sense terminal and the state end of digital rotary switch, select wherein a road power supply by gating device after and before digital knob switch rotates, processor, by detecting the voltage magnitude of described sense terminal or state end, judges the controlled device of current selected.
3. digital knob switch multiplexing device according to claim 2, is characterized in that: the state end of described digital knob switch connects the ADC interface of processor, and sense terminal connects the GPIO mouth of processor; Processor is by detecting the controlled device of the magnitude of voltage judgement current selected of its ADC interface conversion output, by detecting the low and high level state of GPIO mouth described in it, judges whether digital knob switch rotates.
4. digital knob switch multiplexing device according to claim 3, it is characterized in that: described processor is according to the phase differential between the state end of digital knob switch and sense terminal, the rotation direction of judgement digital knob switch, and then regulate the parameter value of controlled device increase or reduce according to rotation direction.
5. according to the digital knob switch multiplexing device described in any one in claim 1 to 4, it is characterized in that: at described power supply, comprise the highest direct supply of a road voltage magnitude, all the other each road power supplies generate via the conversion of bleeder circuit dividing potential drop by the highest direct supply of this road voltage magnitude.
6. digital knob switch multiplexing device according to claim 5, is characterized in that: by described bleeder circuit dividing potential drop conversion, generate Ge road power supply and via a road anti-back flow circuit, export separately the feeder ear of digital knob switch to.
7. digital knob switch multiplexing device according to claim 5, it is characterized in that: when described controlled device is two kinds, described gating device is a keyswitch, and described keyswitch is connected between the direct supply and the feeder ear of digital knob switch that described voltage magnitude is the highest; Described bleeder circuit is connected between the direct supply and ground that voltage magnitude is the highest, and dividing potential drop node connects the feeder ear of described digital knob switch.
8. digital knob switch multiplexing device according to claim 5, is characterized in that: when described controlled device is two or more, described gating device is a single pole multiple throw; The common port of described single pole multiple throw connects the highest direct supply of described voltage magnitude, wherein a road gating end directly connects the feeder ear of described digital knob switch, each road gating end is separately by a component volt circuit ground connection in addition, and the dividing potential drop node of each component volt circuit connects the feeder ear of described digital knob switch separately; Or described bleeder circuit Wei Yi road has the circuit of a plurality of dividing potential drop nodes, one end connects the highest direct supply of described voltage magnitude, other end ground connection, the common port of described single pole multiple throw connects the feeder ear of described digital knob switch, and each road gating end correspondingly gating connects each dividing potential drop node.
9. digital knob switch multiplexing device according to claim 5, is characterized in that: the direct supply that described voltage magnitude is the highest passes through filter capacitor ground connection.
10. an electronic equipment, is characterized in that: be provided with the digital knob switch multiplexing device as described in any one claim in claim 1 to 9.
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