CN106374937A - Circuit in which indicator lamps and keys sharing ports for control - Google Patents
Circuit in which indicator lamps and keys sharing ports for control Download PDFInfo
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- CN106374937A CN106374937A CN201611011877.6A CN201611011877A CN106374937A CN 106374937 A CN106374937 A CN 106374937A CN 201611011877 A CN201611011877 A CN 201611011877A CN 106374937 A CN106374937 A CN 106374937A
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- 238000002955 isolation Methods 0.000 claims abstract description 36
- 230000001276 controlling effect Effects 0.000 claims description 28
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 8
- 230000006870 function Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000010408 sweeping Methods 0.000 description 2
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Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M11/00—Coding in connection with keyboards or like devices, i.e. coding of the position of operated keys
- H03M11/20—Dynamic coding, i.e. by key scanning
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
Abstract
The embodiment of the invention discloses a circuit in which indicator lamps and keys sharing ports for control, in order to solve the technical problem in the prior art that the working current of an indicator lamp cannot reach the optimal as the cathode and anode ports of the indicator lamp are directly connected to the IO ports of a single chip microcomputer chip and the current output capacity of each IO port of the single chip microcomputer chip is limited. The circuit comprises a key switch unit, a key isolation resistor unit, an IO interface unit, triode current-limiting resistor units, a driving indicator lamp triode unit, an indicator lamp current-limiting resistor unit, and an indicator lamp unit. The first triode current-limiting resistor unit is connected with the base of a PNP triode in the driving indicator lamp triode unit. The indicator lamp current-limiting resistor unit and the indicator lamp unit are connected in series between the collector of the PNP triode and the second triode current-limiting resistor unit.
Description
Technical field
The present invention relates to display lamp and button multiplexing control and indicator lamp brightness adjusts field, more particularly, to a kind of display lamp
Circuit with button multiplexing port controlling.
Background technology
In the prior art, display lamp and button can be multiplexed limited io mouth and carry out display lamp control and key scan,
Display lamp and button can work independently mutually and not interfere with each other, and the small household electrical appliance that this method is typically employed in low cost controls
On panel.When small household electrical appliance control panel function is more complicated, the io mouth quantity of needs is more, but general low cost monolithic machine
Chip io mouth resource is very limited, prior art achieve expand under limited io mouth resource situation more display lamps control and
Key scan.
But, the negative electrode of display lamp of the prior art and anode port are directly connected in the io port of singlechip chip
Central, and the current output capability iout (max) of each io port of singlechip chip and electric current input capability iin (max) are
Conditional, and the overall electric current output input capability in singlechip chip io port is also conditional, therefore its display lamp
Operating current can be limited to the current output capability of each io port of singlechip chip, be also limited by singlechip chip io port
Total current output capability.Therefore, the operating current of display lamp does not ensure that the optimal demand that reaches, that is, display lamp is bright
Degree does not ensure that and reaches optimum state, and indicator lamp quantity is more, and its brightness more can not reach optimum state.
Content of the invention
Embodiments provide a kind of display lamp and the circuit of button multiplexing port controlling, solve in prior art
Because the negative electrode of display lamp and anode port are directly connected in the middle of the io port of singlechip chip, and singlechip chip each
The current output capability of io port and input capability are all that the operating current of conditional led to display lamp can not reach
The technical problem of good demand.
A kind of display lamp provided in an embodiment of the present invention and the circuit of button multiplexing port controlling, comprising:
Key switch unit, button isolation resistance unit, io interface unit, audion current-limiting resistance unit, driving instruction
Lamp audion unit, display lamp current-limiting resistance unit and indicator unit；
First audion current-limiting resistance unit is connected with driving the pnp transistor base in display lamp audion unit；
Display lamp current-limiting resistance unit and indicator unit are connected in series in pnp transistor collector and the second audion limit
Between leakage resistance unit.
Preferably, io interface unit includes scanning port and public port.
Preferably, scanning port one end is connected with the first audion current-limiting resistance unit, the scanning port other end and button
Isolation resistance unit connects；
Public port one end is connected with the second audion current-limiting resistance unit, the scanning port other end and button isolation resistance
Unit connects.
Preferably, button isolation resistance unit one end is connected with io interface unit, the button isolation resistance unit other end with
Key switch unit connects.
Preferably, key switch unit one end is connected with button isolation resistance unit, the key switch unit other end with low
Level connects.
Preferably, display lamp current-limiting resistance unit and indicator unit are connected in series in pnp transistor collector and second
Specifically include between audion current-limiting resistance unit:
Pnp transistor collector is connected with indicator unit；
Indicator unit is connected with the second audion current-limiting resistance unit through display lamp current-limiting resistance unit.
Preferably, indicator unit is connected specifically with the second audion current-limiting resistance unit through display lamp current-limiting resistance unit
Including:
It is connected with driving display lamp audion list between display lamp current-limiting resistance unit and the second audion current-limiting resistance unit
Npn triode in unit；
Npn triode base stage is connected with the second audion current-limiting resistance unit, Npn triode colelctor electrode and display lamp current limliting
Resistance unit connects；
Npn triode emitter stage is connected with low level.
Preferably, pnp triode emitter stage is connected with high level.
Preferably, io interface unit exports the high frequency pwm of scalable dutycycle, carries out the numeral tune of display lamp operating current
Section.
Preferably, the equipping rules of button isolation resistance cell resistance resistance and audion current-limiting resistance cell resistance resistance
Press the level of rear public port for button:
Vswn=v*rswn/ (rswn+rpnpn) ＜ 0.3*v；
Wherein v is the high level being connected with pnp audion.
As can be seen from the above technical solutions, the embodiment of the present invention has the advantage that
Embodiments provide a kind of display lamp and the circuit of button multiplexing port controlling, limited by the first audion
Leakage resistance unit is connected with driving the pnp transistor base in display lamp audion unit；Display lamp current-limiting resistance unit and referring to
Show that lamp unit is connected in series between pnp transistor collector and the second audion current-limiting resistance unit；Solve prior art
In be directly connected in the middle of the io port of singlechip chip due to the negative electrode of display lamp and anode port, and singlechip chip is every
The current output capability of individual io port and input capability are all that the operating current of conditional led to display lamp can not reach
The technical problem of optimal demand.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, also may be used
So that other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is an embodiment of the circuit of a kind of display lamp provided in an embodiment of the present invention and button multiplexing port controlling
Structural representation.
Fig. 2 is an embodiment of the circuit of a kind of display lamp provided in an embodiment of the present invention and button multiplexing port controlling
Workflow diagram.
Fig. 3 is another enforcement of the circuit of a kind of display lamp provided in an embodiment of the present invention and button multiplexing port controlling
The structural representation of example.
Fig. 4 is another enforcement of the circuit of a kind of display lamp provided in an embodiment of the present invention and button multiplexing port controlling
The workflow diagram of example.
Illustrate, 1 key switch unit, 2 button isolation resistance units, 3io interface unit, 4a the first audion current limliting
Resistance unit, 4b the second audion current-limiting resistance unit, 5 driving display lamp pnp audion units, 6 indicator unit, 7 instructions
Lamp current-limiting resistance unit, 8 driving display lamp Npn triode units.
Specific embodiment
Embodiments provide a kind of display lamp and the circuit of button multiplexing port controlling, for solving prior art
In be directly connected in the middle of the io port of singlechip chip due to the negative electrode of display lamp and anode port, and singlechip chip is every
The current output capability of individual io port and input capability are all that the operating current of conditional led to display lamp can not reach
The technical problem of optimal demand.
For enabling the goal of the invention of the present invention, feature, advantage more obvious and understandable, below in conjunction with the present invention
Accompanying drawing in embodiment, is clearly and completely described it is clear that disclosed below to the technical scheme in the embodiment of the present invention
Embodiment be only a part of embodiment of the present invention, and not all embodiment.Based on the embodiment in the present invention, this area
All other embodiment that those of ordinary skill is obtained under the premise of not making creative work, broadly falls into present invention protection
Scope.
Refer to Fig. 1, the circuit of a kind of display lamp provided in an embodiment of the present invention and button multiplexing port controlling, comprising:
Key switch unit 1, button isolation resistance unit 2, io interface unit 3, audion current-limiting resistance unit, driving refer to
Show lamp audion unit, display lamp current-limiting resistance unit 7 and indicator unit 6；
First audion current-limiting resistance unit 4a is connected with driving the pnp transistor base in display lamp audion unit；
Display lamp current-limiting resistance unit 7 and indicator unit 6 are connected in series in pnp transistor collector and the second audion
Between current-limiting resistance unit 4b.
Further, io interface unit 3 includes scanning port and public port.
Further, scanning port one end is connected with the first audion current-limiting resistance unit 4a, the scanning port other end with
Button isolation resistance unit 2 connects；
Public port one end is connected with the second audion current-limiting resistance unit 4b, and the scanning port other end is electric with button isolation
Resistance unit 2 connects.
Further, button isolation resistance unit 2 one end is connected with io interface unit 3, and button isolation resistance unit 2 is another
End is connected with key switch unit 1.
Further, key switch unit 1 one end is connected with button isolation resistance unit 2, key switch unit 1 other end
It is connected with low level.
Further, display lamp current-limiting resistance unit 7 and indicator unit 6 be connected in series in pnp transistor collector and
Specifically include between second audion current-limiting resistance unit 4b:
Pnp transistor collector is connected with indicator unit 6；
Indicator unit 6 is connected with the second audion current-limiting resistance unit 4b through display lamp current-limiting resistance unit 7.
Further, indicator unit 6 connects through display lamp current-limiting resistance unit 7 and the second audion current-limiting resistance unit 4b
Connect and specifically include:
It is connected with driving display lamp audion between display lamp current-limiting resistance unit 7 and the second audion current-limiting resistance unit 4b
Npn triode in unit；
Npn triode base stage is connected with the second audion current-limiting resistance unit 4b, and Npn triode colelctor electrode is limited with display lamp
Leakage resistance unit 7 connects；
Npn triode emitter stage is connected with low level.
Further, pnp triode emitter stage is connected with high level.
Further, io interface unit 3 exports the high frequency pwm of scalable dutycycle, carries out the number of display lamp operating current
Regulation.
Further, the configuration of button isolation resistance unit 2 resistance and audion current-limiting resistance cell resistance resistance
Principle presses the level of rear public port for button:
Vswn=v*rswn/ (rswn+rpnpn) ＜ 0.3*v；
Wherein v is the high level being connected with described pnp audion.
Need it is further noted that io interface unit 3 is provided with multiple io interfaces for driving audion, io interface
It is divided into scanning port (seg) and public port (com), audion unit is divided into the pnp audion pipe unit driving scanning port
With the Npn triode pipe unit driving public port, indicator unit 6 has multiple display lamps, and display lamp is connected with current-limiting resistance
It is connected between pnp pipe and the c pole of npn pipe, described indicator unit 6 is display lamp matrix array, and key switch unit 1 has many
Individual button, button one end and isolation resistance are connected in series on each scanning port and public port, and the other end is connected to low electricity
On flat.
Compared to prior art, the circuit of a kind of display lamp provided in an embodiment of the present invention and button multiplexing port controlling,
Its display lamp array connects by using the pnp audion of scanning port and the Npn triode of public port, to reach display lamp
The maximized purpose of operating current, then coordinate the output high frequency pwm duty cycle adjustment of io mouth, it is possible to achieve arbitrarily adjust display lamp
Operating current is indicator lamp brightness function；Drive current-limiting resistance additionally by reasonable disposition button isolation resistance resistance and audion
Resistance, its equipping rules is the level that button presses rear public port:
Vswn=v*rswn/ (rswn+rpnpn) ＜ 0.3*v,
Wherein v is the high level being connected with pnp audion, accurately the sweeping of the button to realize being connected with button isolation resistance
Retouch so that scanning port and public port still can be multiplexed key scan in the case of being configured with triode array.With relatively low
Cost achieve display lamp array brightness and can be in harmonious proportion maximum quantity key scan.
Refer to Fig. 2, circuit workflow is as follows:
A1, display lamp actuation step: configure the public port that any one is connected with Npn triode and be in high level shape
State, other public ports are in low level state, the other end of the display lamp being connected with this Npn triode, the pnp being attached thereto
If the scanning port of audion is in low level output it indicates that lamp is bright, otherwise display lamp does not work, and configures all and instruction successively
The public port of the Npn triode that lamp is connected, scans all display lamps；If other public port output is not fixing low electricity
Flat, but output duty cycle adjustable high frequency pwm is it indicates that the operating current of lamp can carry out digital regulated, i.e. indicator lamp brightness
Can adjust.
B1, key scan and detecting step: all scanning port of configuration are high level, all public ports are low level,
Configuring all io mouths is input pattern, and arranges internal pull-up resistor, if any io mouth detect during low level then it represents that with this
The button that io mouth connects is pressed, and output key value.
If all buttons of c1 are all scanned, all io mouths of configuration are output mode, according to scan period return to step a,
Otherwise return to step b continues to scan on.
Concrete for of a kind of display lamp provided in an embodiment of the present invention and the circuit of button multiplexing port controlling above
Embodiment and detailed operation flow process.Below in some practical applications, in order to cost-effective, only use scanning port
Pnp audion drives, and allows the electric current of all display lamps directly pour into the one of the brightness demand that also can meet display lamp in io port
Plant display lamp and another embodiment of circuit of button multiplexing port controlling and workflow is described in detail.
Refer to Fig. 3, the circuit of a kind of display lamp provided in an embodiment of the present invention and button multiplexing port controlling, comprising:
Key switch unit 1, button isolation resistance unit 2, io interface unit 3, audion current-limiting resistance unit, driving refer to
Show lamp audion unit, display lamp current-limiting resistance unit 7 and indicator unit 6；
First audion current-limiting resistance unit 4a is connected with driving the pnp transistor base in display lamp audion unit；
Display lamp current-limiting resistance unit 7 and indicator unit 6 are connected in series in pnp transistor collector and the second audion
Between current-limiting resistance unit 4b.
Preferably, io interface unit 3 includes scanning port and public port.
Further, scanning port one end is connected with the first audion current-limiting resistance unit 4a, the scanning port other end with
Button isolation resistance unit 2 connects；
Public port one end is connected with the second audion current-limiting resistance unit 4b, and the scanning port other end is electric with button isolation
Resistance unit 2 connects.
Preferably, button isolation resistance unit 2 one end is connected with io interface unit 3, button isolation resistance unit 2 other end
It is connected with key switch unit 1.
Preferably, key switch unit 1 one end is connected with button isolation resistance unit 2, key switch unit 1 other end with
Low level connects.
Further, display lamp current-limiting resistance unit 7 and indicator unit 6 be connected in series in pnp transistor collector and
Specifically include between second audion current-limiting resistance unit 4b:
Pnp transistor collector is connected with indicator unit 6；
Indicator unit 6 is connected with the second audion current-limiting resistance unit 4b through display lamp current-limiting resistance unit 7.
Preferably, pnp triode emitter stage is connected with high level.
Preferably, io interface unit 3 exports the high frequency pwm of scalable dutycycle, carries out the numeral of display lamp operating current
Adjust.
Preferably, the configuration of button isolation resistance unit 2 resistance and audion current-limiting resistance cell resistance resistance is former
The level of rear public port is then pressed for button:
Vswn=v*rswn/ (rswn+rpnpn) ＜ 0.3*v；
Wherein v is the high level being connected with described pnp audion.
A kind of display lamp provided in an embodiment of the present invention and the circuit of button multiplexing port controlling, including key switch unit
1st, button isolation resistance unit 2, io interface unit 3, audion current-limiting resistance unit, driving display lamp audion unit, instruction
Lamp current-limiting resistance unit 7 and indicator unit 6, io interface unit 3 is provided with multiple io interfaces for driving audion, and io connects
Mouth is divided into scanning port (seg) and public port (com), and audion unit is the pnp audion pipe unit driving scanning port,
Indicator unit 6 has multiple display lamps, display lamp and current-limiting resistance to be connected in series between pnp audion and public port, institute
Stating indicator unit 6 is display lamp matrix array, and key switch unit 1 has multiple buttons, is connected with isolation resistance in button one end
It is connected on each scanning port and public port, the other end is connected in low level.
The display lamp providing compared to prior art, the present invention and the circuit of button multiplexing port controlling, it indicates lamp array
Row connect by using the pnp audion of scanning port and public port, to reach and to meet display lamp recommended current purpose,
Coordinate the output high frequency pwm duty cycle adjustment of io mouth again, it is possible to achieve arbitrarily adjusting display lamp operating current is indicator lamp brightness
Function；Drive current-limiting resistance resistance additionally by reasonable disposition button isolation resistance resistance and audion, its equipping rules be by
Key presses the level of rear public port:
Vswn=v*rswn/ (rswn+rpnpn) ＜ 0.3*v,
Wherein v is the high level being connected with pnp audion, accurately the sweeping of the button to realize being connected with button isolation resistance
Retouch so that scanning port and public port still can be multiplexed key scan in the case of being configured with triode array.With relatively low
Cost achieve display lamp array brightness and can be in harmonious proportion maximum quantity key scan.
Realize flow process as follows:
A2, display lamp actuation step: configure the scanning port that any one is connected with pnp audion and be in low level shape
State, other scanning port are in high level state, if the public port of the display lamp being connected with this pnp audion is in low level
It indicates that lamp is bright, otherwise display lamp does not work, and configures the scanning port of all pnp audions being connected with display lamp successively for output,
Scan all display lamps；If other scanning port output is not fixing low level, but the adjustable high frequency of output duty cycle
It indicates that the operating current of lamp can carry out digital regulated, that is, indicator lamp brightness can be adjusted pwm.
B2, key scan and detecting step: all scanning port of configuration are high level, all public ports are high level,
Configuring all io mouths is input pattern, and arranges internal pull-up resistor, if any io mouth detect during low level then it represents that with this
The button that io mouth connects is pressed, and output key value.
If all buttons of c2 are all scanned, all io mouths of configuration are output mode, according to scan period return to step a,
Otherwise return to step b continues to scan on.
It should be noted that in this inventive embodiments, from unlike the first inventive embodiments, the first inventive embodiments can
To scan public port or scanning scanning port, the stable brightness effects of identical display lamp can be obtained, but at this
In bright embodiment it is necessary to scanning scanning port, that is, the same time only allow same public port have a display lamp work electricity
Stream flows into, to ensure stablizing of indicator lamp brightness, because the electric current iin (max) that pours into of io mouth is limited, if the same time
The operating current that same public port has multiple display lamps flows into, and can cause the current saturation that pours into of io mouth, multiple display lamps
Operating current occurs fluctuation, cause display lamp operating brightness not quietly.
To sum up, embodiments provide the circuit of a kind of display lamp and button multiplexing port controlling, by the one or three
Pole pipe current-limiting resistance unit 4a is connected with driving the pnp transistor base in display lamp audion unit；Display lamp current-limiting resistance
Unit 7 and indicator unit 6 are connected in series between pnp transistor collector and the second audion current-limiting resistance unit 4b；Solution
Because the negative electrode of display lamp and anode port are directly connected in the middle of the io port of singlechip chip in prior art of having determined, and
The current output capability of each io port of singlechip chip and input capability are the work of conditional led to display lamp
Electric current can not reach the technical problem of optimal demand.
Those skilled in the art can be understood that, for convenience and simplicity of description, the system of foregoing description,
Device and the specific work process of unit, may be referred to the corresponding process in preceding method embodiment, will not be described here.
It should be understood that disclosed system in several embodiments provided herein, apparatus and method are permissible
Realize by another way.For example, device embodiment described above is only schematically, for example, the division of unit,
It is only a kind of division of logic function, actual can have other dividing mode when realizing, and for example multiple units or assembly are permissible
In conjunction with or be desirably integrated into another system, or some features can be ignored, or does not execute.Another, shown or discussed
Coupling each other direct-coupling or communication connection can be by some interfaces, the INDIRECT COUPLING of device or unit or
Communication connection, can be electrical, mechanical or other forms.
The unit illustrating as separating component can be or may not be physically separate, show as unit
Part can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple networks
On unit.The purpose to realize this embodiment scheme for some or all of unit therein can be selected according to the actual needs.
In addition, can be integrated in a processing unit in each functional unit in each embodiment of the present invention it is also possible to
It is that unit is individually physically present it is also possible to two or more units are integrated in a unit.Above-mentioned integrated list
Unit both can be to be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.
If integrated unit realized using in the form of SFU software functional unit and as independent production marketing or use when, can
To be stored in a computer read/write memory medium.Based on such understanding, technical scheme substantially or
Say that all or part of part or this technical scheme that prior art is contributed can be embodied in the form of software product
Out, this computer software product is stored in a storage medium, including some instructions with so that a computer equipment
(can be personal computer, server, or network equipment etc.) executes all or part of each embodiment method of the present invention
Step.And aforesaid storage medium includes: u disk, portable hard drive, read only memory (rom, read-only memory), random
Access memorizer (ram, random access memory), magnetic disc or CD etc. are various can be with Jie of store program codes
Matter.
More than, above example only in order to technical scheme to be described, is not intended to limit；Although with reference to aforementioned reality
Apply example the present invention has been described in detail, it will be understood by those within the art that: it still can be to aforementioned each
Technical scheme described in embodiment is modified, or carries out equivalent to wherein some technical characteristics；And these modifications
Or replace, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. the circuit of a kind of display lamp and button multiplexing port controlling is it is characterised in that include:
Key switch unit, button isolation resistance unit, io interface unit, audion current-limiting resistance unit, driving display lamp three
Pole pipe unit, display lamp current-limiting resistance unit and indicator unit；
First audion current-limiting resistance unit is connected with the described pnp transistor base driving in display lamp audion unit；
Described display lamp current-limiting resistance unit and described indicator unit are connected in series in described pnp transistor collector and second
Between audion current-limiting resistance unit.
2. the circuit of display lamp according to claim 1 and button multiplexing port controlling is it is characterised in that described io interface
Unit includes scanning port and public port.
3. the circuit of display lamp according to claim 2 and button multiplexing port controlling is it is characterised in that described scanning end
Mouthful one end is connected with described first audion current-limiting resistance unit, the described scanning port other end and described button isolation resistance list
Unit connects；
Described public port one end is connected with described second audion current-limiting resistance unit, the described scanning port other end with described
Button isolation resistance unit connects.
4. display lamp according to claim 3 and button multiplexing port controlling circuit it is characterised in that described button every
It is connected with described io interface unit from resistance unit one end, the described button isolation resistance unit other end is with key switch unit even
Connect.
5. the circuit of display lamp according to claim 3 and button multiplexing port controlling is it is characterised in that described button is opened
Close unit one end to be connected with button isolation resistance unit, the described key switch unit other end is connected with low level.
6. the circuit of display lamp according to claim 1 and button multiplexing port controlling is it is characterised in that described display lamp
Current-limiting resistance unit and described indicator unit are connected in series in described pnp transistor collector and described second audion current limliting
Specifically include between resistance unit:
Described pnp transistor collector is connected with described indicator unit；
Described indicator unit is connected with described second audion current-limiting resistance unit through described display lamp current-limiting resistance unit.
7. according to claim 6 the circuit of display lamp and button multiplexing port controlling it is characterised in that described display lamp list
Unit is connected with described second audion current-limiting resistance unit through described display lamp current-limiting resistance unit and specifically includes:
It is connected with described driving display lamp between described display lamp current-limiting resistance unit and described second audion current-limiting resistance unit
Npn triode in audion unit；
Described Npn triode base stage is connected with described second audion current-limiting resistance unit, described Npn triode colelctor electrode and institute
State display lamp current-limiting resistance unit to connect；
Described Npn triode emitter stage is connected with low level.
8. the circuit of display lamp according to claim 1 and button multiplexing port controlling is it is characterised in that described pnp tri-
Level pipe emitter stage is connected with high level.
9. the circuit of display lamp according to claim 1 and button multiplexing port controlling is it is characterised in that described io interface
Unit exports the high frequency pwm of scalable dutycycle, carries out the digital regulated of display lamp operating current.
10. the circuit of display lamp according to claim 1 and button multiplexing port controlling is it is characterised in that described button
The equipping rules of isolation resistance cell resistance resistance and described audion current-limiting resistance cell resistance resistance are public after pressing for button
The level of port altogether:
Vswn=v*rswn/ (rswn+rpnpn) ＜ 0.3*v；
Wherein v is the high level being connected with described pnp audion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201611011877.6A CN106374937A (en) | 2016-11-17 | 2016-11-17 | Circuit in which indicator lamps and keys sharing ports for control |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611011877.6A CN106374937A (en) | 2016-11-17 | 2016-11-17 | Circuit in which indicator lamps and keys sharing ports for control |
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| CN106374937A true CN106374937A (en) | 2017-02-01 |
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| CN201611011877.6A Pending CN106374937A (en) | 2016-11-17 | 2016-11-17 | Circuit in which indicator lamps and keys sharing ports for control |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106683604A (en) * | 2017-03-22 | 2017-05-17 | 佛山市顺德区携创电机制造有限公司 | LED display and key detection multiplexing circuit |
| CN109688656A (en) * | 2018-11-28 | 2019-04-26 | 珠海市杰理科技股份有限公司 | Key time multiplexing circuit and chip circuit |
| CN110675808A (en) * | 2019-10-15 | 2020-01-10 | 珠海格力电器股份有限公司 | Display circuit, display device and display equipment |
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| CN109688656A (en) * | 2018-11-28 | 2019-04-26 | 珠海市杰理科技股份有限公司 | Key time multiplexing circuit and chip circuit |
| CN109688656B (en) * | 2018-11-28 | 2021-03-19 | 珠海市杰理科技股份有限公司 | Key time division multiplexing circuit and chip circuit |
| CN110675808A (en) * | 2019-10-15 | 2020-01-10 | 珠海格力电器股份有限公司 | Display circuit, display device and display equipment |
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Application publication date: 20170201 |