CN108519892A - Start-up mode selection circuit and electronic equipment - Google Patents
Start-up mode selection circuit and electronic equipment Download PDFInfo
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- CN108519892A CN108519892A CN201810259511.3A CN201810259511A CN108519892A CN 108519892 A CN108519892 A CN 108519892A CN 201810259511 A CN201810259511 A CN 201810259511A CN 108519892 A CN108519892 A CN 108519892A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/4401—Bootstrapping
- G06F9/4418—Suspend and resume; Hibernate and awake
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Abstract
The present invention relates to a kind of start-up mode selection circuit and a kind of electronic equipment, including：Switch control module, mode selection circuit, interface circuit and mode control circuit；Switch control module passes through mode selection circuit connection mode control circuit；The output end connection mode control circuit of interface circuit, the input terminal of interface circuit are used to access the digital interface of computer equipment；When the input terminal of interface circuit accesses or do not access the digital interface of computer equipment, interface circuit exports corresponding interface signal to mode control circuit；Mode control circuit controls signal according to mode select signal and corresponding interface signal output mode, and mode control signal is used to indicate starts reforestation practices or normal boot-strap pattern using the electronic equipment of start-up mode selection circuit.Above-mentioned start-up mode selection circuit can make electronic equipment selection enter reforestation practices or normal boot-strap pattern, and structure is very simple, easy to operate.
Description
Technical field
The present invention relates to electronic equipment intelligent hardware devices fields, more particularly to a kind of start-up mode selection circuit and one
Kind electronic equipment.
Background technology
The usual equipment of electronic equipment has recovery (commonly referred to as：Recovery) pattern, user are using electronic equipment process
In, a series of settings can be carried out to electronic equipment by reforestation practices, such as factory reset, system switching, brush machine are (i.e.
Carry out system upgrade) etc..Currently, the common mode into reforestation practices is generally divided into two kinds, one is shut down in electronic equipment
When state, at the same press main screen key, power key and volume key (i.e. multiple key combinations pressing modes) be electronic equipment into
Enter reforestation practices, operation is very inconvenient；Another kind is that specifically recovery button makes electronics on an electronic device by pressing setting
Setting enters reforestation practices, however in order to avoid the maloperation of user, restore button and is generally arranged at more hidden position, and
Recovery keypress function could be started by special tool, operation is also and its inconvenient.
Invention content
Based on this, it is necessary to for the inconvenient problem of existing reforestation practices Starting mode, provide a kind of startup mould
Formula selection circuit.
A kind of start-up mode selection circuit, including：Switch control module, mode selection circuit, interface circuit and pattern control
Circuit processed；
The switch control module connects the mode control circuit by the mode selection circuit；The interface circuit
Output end connect the mode control circuit, the number that the input terminal of the interface circuit is used to access computer equipment connects
Mouthful, when the input terminal of the interface circuit accesses the digital interface of the computer equipment, the computer equipment is described
Interface circuit is powered；
The mode selection circuit according to the switch control signal output mode selection signal of the switch control module extremely
The mode control circuit；
When the input terminal of the interface circuit accesses or does not access the digital interface of computer equipment, the interface circuit
Corresponding interface signal is exported to the mode control circuit；
The mode control circuit is controlled according to the mode select signal and corresponding interface signal output mode
Signal, the mode control signal be used to indicate using the start-up mode selection circuit electronic equipment start reforestation practices or
Normal boot-strap pattern.
Above-mentioned start-up mode selection circuit includes：Switch control module, mode selection circuit, interface circuit and pattern control
Circuit processed, in switch control module output switch control signal to mode selection circuit, mode selection circuit is controlled according to switch
Signal output mode selection signal is to mode control circuit；In addition, the number of the input terminal access computer equipment in interface circuit
When word interface, computer equipment is powered for interface circuit；When the input terminal of interface circuit accesses or do not access computer equipment
When digital interface, interface circuit exports corresponding interface signal to mode control circuit；In mode control circuit in model selection
Being turned on and off under the interface signal effect of signal and interface circuit output, and corresponding mode control signal is exported,
Then the electronic equipment for controlling using the start-up mode selection circuit according to mode control signal start normally-open pattern or
Reforestation practices.Above-mentioned start-up mode selection circuit can just make electronic equipment selection enter reforestation practices or normal boot-strap mould
Formula, structure is very simple, easy to operate.
According to above-mentioned start-up mode selection circuit, a kind of electronic equipment is additionally provided in the embodiment of the present invention.
A kind of electronic equipment, including the start-up mode selection circuit.
Above-mentioned electronic equipment is because of the start-up mode selection circuit described in using, in this way, the electronic equipment can facilitate
Enter reforestation practices or normal boot-strap pattern, it is easy to operate.
Description of the drawings
Fig. 1 is the structural schematic diagram of start-up mode selection circuit one embodiment wherein of the present invention；
Fig. 2 is the structural schematic diagram of start-up mode selection circuit one embodiment wherein of the present invention；
Fig. 3 is the structural schematic diagram of start-up mode selection circuit one embodiment wherein of the present invention.
Specific implementation mode
Present disclosure is described in further detail below in conjunction with preferred embodiment and attached drawing.Obviously, hereafter institute
The embodiment of description only explains the present invention rather than limitation of the invention.Based on the embodiments of the present invention, the common skill in this field
The every other embodiment that art personnel are obtained without making creative work belongs to the model that the present invention protects
It encloses.It should be noted that for ease of description, only some but not all contents related to the present invention are shown in the drawings.
To facilitate the understanding of the present invention, below with reference to relevant drawings to being originally described more fully.
It should be noted that when an element is considered as " connection " another element, it can be directly to separately
One element and it is in combination be integrated, or may be simultaneously present centering elements.Term as used herein " installation ", " one
End ", " other end " and similar statement are for illustrative purposes only.
Unless otherwise defined, the technology of all of technologies and scientific terms used here by the article and the technical field for belonging to this
The normally understood meaning of personnel is identical.Term used in book described herein is intended merely to the mesh of description specific embodiment
, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more relevant Listed Items
Any and all combinations.In addition, " first ", " second ", " third ", " the 4th " are intended merely to described by differentiation herein
Object, be not the restriction to object.
As shown in Figure 1, a kind of start-up mode selection circuit, as shown in Figure 1, including：Switch control module 10, pattern choosing
Select circuit 20, interface circuit 30 and mode control circuit 40.Switch control module 10 passes through 20 connection mode of mode selection circuit
Control circuit 40；The output end connection mode control circuit 40 of interface circuit 30, the input terminal of interface circuit 30 is based on accessing
The digital interface for calculating machine equipment, when the input terminal of interface circuit 30 accesses the digital interface of computer equipment, computer equipment
For interface circuit power supply 40；Mode selection circuit 20 selects to believe according to the switch control signal output mode of switch control module 10
Number to mode control circuit 40；When the input terminal of interface circuit 30 accesses or do not access the digital interface of computer equipment, connect
Mouth circuit 30 exports corresponding interface signal to mode control circuit 40；Mode control circuit 40 is according to mode select signal and phase
The interface signal output mode control signal answered, mode control signal is used to indicate to be set using the electronics of start-up mode selection circuit
It is standby to start reforestation practices or normal boot-strap pattern.
Specifically, switch control module can be any one switch control element, and switch control element state changes (example
When such as closure or disconnection), corresponding switch control signal is exported to mode selection circuit, the output signal of mode selection circuit
It will change.In the present embodiment, when switch control module disconnects, mode selection circuit 20 be off (or cut
Only state).When switch control module is closed, mode selection circuit 20 is in open state (or conducting state), output mode choosing
Select signal.In addition, when the input terminal of interface circuit 30 accesses the digital interface of computer equipment, computer equipment is interface
Circuit power supply 30；When the input terminal of interface circuit 30 accesses or does not access the digital interface of computer equipment, interface circuit 30
Output interface signal is corresponded to mode control circuit 40；Wherein interface signal is mainly a kind of high level or low level signal, i.e.,
Mode control circuit 40 provides high level or low level, and mode control circuit 40 is made to be opened according to interface signal and mode select signal
(i.e. on or off) is opened or closed, and generates corresponding mode control signal.
The digital interface is typically the USB interface of computer equipment.
Above-mentioned start-up mode selection circuit includes：Switch control module 10, mode selection circuit 20,30 and of interface circuit
Mode control circuit 40, in 10 output switch control signal of switch control module to mode selection circuit 20, mode selection circuit
20 according to switch control signal output mode selection signal to mode control circuit 40, in addition, in the input terminal of interface circuit 30
When accessing the digital interface of computer equipment, computer equipment is powered for interface circuit 30；When the input of interface circuit 30 terminates
When entering or not accessing the digital interface of computer equipment, interface circuit 30 corresponds to output interface signal to mode control circuit；
Being turned on and off under the interface signal effect that mode select signal and interface circuit 30 export of mode control circuit 40,
And corresponding mode control signal is exported, is then controlled using the start-up mode selection circuit according to mode control signal
Electronic equipment starts normally-open pattern or reforestation practices.Above-mentioned start-up mode selection circuit can make electronic equipment select into
Enter reforestation practices or normal boot-strap pattern, structure is very simple, easy to operate.
The switch control signal is low level signal in one of the embodiments,；It is low electricity in switch control signal
When ordinary mail, mode selection circuit 20 exports high level；
When the input terminal of interface circuit 30 accesses the digital interface of the computer equipment, interface circuit 30 exports height
Level signal；When the input terminal of interface circuit 30 does not access the digital interface of computer equipment, interface circuit 30 exports low electricity
Ordinary mail number；
When mode selection circuit exports low level and interface signal exports low level signal, mode control circuit output
High level；When mode selection circuit exports low level and interface signal exports high level signal, mode control circuit output
Low level.
Specifically, interface signal is usually high level or low level signal, mainly provides one for mode control circuit 40
Kind high level or low level signal, to which mode control circuit 40 is turned on and off, to which mode control circuit 40 is according to interface
Signal and mode select signal output high level or low level signal, finally control electronics according to high level or low level signal
Equipment starts normal boot-strap pattern or reforestation practices.Specifically, the computer is accessed in the input terminal of interface circuit 30 to set
When standby digital interface, interface circuit 30 exports high level signal；Computer equipment is not accessed in the input terminal of interface circuit 30
Digital interface when, interface circuit 30 export low level signal.In the present embodiment, believe for low level in mode selection circuit 20
Number (exporting low level), when interface circuit 30 is also low level signal, mode control circuit 40 exports high level, wherein high electricity
It is flat to be generally used for that electronic equipment is made to enter normal boot-strap pattern.It is that low level signal (exports low electricity in mode selection circuit 20
It is flat), when interface circuit 30 is high level signal, mode control circuit 40 exports low level, and wherein low level is generally used for making electricity
Sub- equipment enters reforestation practices.Using above-mentioned level control mode, circuit structure can be simplified.
Switch control signal is high level signal in one of the embodiments,；Believe for high level in switch control signal
Number when, mode selection circuit 20 export high level；High level is exported in mode selection circuit 20 and interface signal 30 exports height
When level signal, mode control circuit exports high level.
Specifically, after electronic equipment starts normal boot-strap pattern or reforestation practices, switch control module 10 exports
High level, mode selection circuit 20 is opened, and exports high level.When electronic equipment starts normal boot-strap pattern or reforestation practices
Afterwards, interface circuit 30 exports high level signal.I.e. at this point, mode selection circuit 20 is high level, interface circuit 30 is also high electricity
Flat, mode control circuit 40 will close (or cut-off), and export high level.When electronic equipment is in normal boot-strap pattern, mould
The high level that formula control circuit 40 exports at this time avoids electronic equipment because maloperation enters reforestation practices, to carry out system to it
Upgrading etc..When electronic equipment is in reforestation practices, the high level that mode control circuit 40 exports at this time avoids electronic equipment quilt
Repeatedly triggering repeats to enter reforestation practices.Using above-mentioned level control mode, avoid because maloperation makes the mould of electronic equipment
There is mistake in formula startup, and repeatedly triggering starts model identical.
In one of the embodiments, as shown in Fig. 2, mode selection circuit 20 includes first resistor R1, second resistance R2
With first switch unit 21；Wherein, the input that one end of first resistor R1 passes through second resistance R2 connection first switches unit 21
End, and be grounded by switch control module 10；The other end of first resistor R1 is for connecting the first power supply VCC1；First switch control
The output end connection mode control circuit 40 of molding module unit 21.
In the present embodiment, when switch control module 10 disconnects, the input of the first power supply VCC1 and first switch unit
End connection, the input terminal for first switch unit 21 provide high level so that first switch unit 21 is connected, and exports high electricity
It is flat.When switch control module 10 is closed, the input terminal of the input end grounding of first switch unit 21, first switch unit 21 is
Low level so that first switch unit 21 ends, and exports low level.Above-mentioned mode selection circuit is simple in structure, user
Just.
In addition, first switch unit 21 can be with transistor.Optionally, transistor can be NMOS tube, PMOS tube etc..It is brilliant
Body pipe is a kind of switching device very easy to use, and power consumption is very low, reduces the consumption of electric energy.
In one of the embodiments, as shown in Fig. 2, mode control circuit 40 includes second switch unit 41 and third
Resistance R3；The input terminal of second switch unit 41 is separately connected the output of the output end and interface circuit 30 of first switch unit 21
End, the output end of second switch unit 41 is by second resistance R2 connection second source VCC2, and second switch unit 41 is defeated
Outlet controls signal for output mode.
In the present embodiment, the signal and interface circuit that second switch unit 41 is exported according to first switch unit 21 are defeated
The signal conduction gone out or cut-off, and low level or high level are exported, thus using low level or high level come control electronics
Start normal boot-strap pattern or reforestation practices.Above-mentioned mode control circuit is simple in structure and easy to control, utilizes output
High level or low level signal can control electronics start different patterns.
In addition, second switch unit 41 can be with transistor.Optionally, transistor can be NMOS tube, PMOS tube etc..It is brilliant
Body pipe is a kind of switching device very easy to use, and power consumption is very low, reduces the consumption of electric energy.
In one of the embodiments, as shown in figure 3, first switch unit 21 includes the first NMOS tube Q1；Wherein,
One end of one resistance R1 is grounded by the grid of second resistance R2 the first NMOS tubes of connection Q1 by switch control module 10；
The other end of first resistor R1 is for connecting the first power supply VCC1；The drain electrode connection second switch unit 41 of first NMOS tube Q1
Input terminal, the source electrode ground connection of the first NMOS tube Q2.
Specifically, metal-oxide-semiconductor (Metal-Oxide-Semiconductor Field-Effect Transistor, metal-
Oxide semiconductor field effect transistor), abbreviation metal-oxide half field effect transistor, be one kind can be widely used in analog circuit with
The field-effect transistor (field-effect transistor) of digital circuit.MOS is according to its " channel " (work carrier)
Polarity is different, can be divided into the two types of " N-type " and " p-type ", also commonly known as NMOS tube and PMOS tube.NMOS tube and PMOS tube
All it is common transistor, it is very easy to use.In the present embodiment, it using NMOS tube Q1, is disconnected in switch control module 10
When, the first power supply VCC1 applies high level to the grid of the first NMOS tube Q1, and the source electrode and drain electrode conducting of the first NMOS tube Q1 makes
Second switch unit 41 is obtained to end.When switch control module 10 is closed, the grounded-grid of the first NMOS pipes Q1 is (i.e. to first
The grid of NMOS tube Q1 applies low level), the source electrode and drain electrode cut-off of the first NMOS tube is opened so as to cause second switch unit 41
It opens.On the one hand it can facilitate being turned on and off for control model control circuit 40 (i.e. second switch unit 41) using NMOS tube,
And then control the operation of switch control module machine control circuit.On the other hand, NMOS power consumptions are very low, further reduce electric energy
Consumption.
It should be appreciated that above-mentioned NMOS tube can be substituted for PMOS tube, and when being substituted for PMOS tube, the source electrode of PMOS tube
Power supply should be connect.In addition, PMOS tube can also change other devices with switch control module function, those skilled in the art into
It can be selected according to actual demand.
In one of the embodiments, as shown in figure 3, second switch unit 42 includes the second NMOS tube Q2；2nd NMOS
The grid of pipe Q2 is separately connected the output end of the grid and interface circuit 30 of the first NMOS tube Q1, the drain electrode of the second NMOS tube Q2
By second resistance R2 connection second source VCC2, and the drain electrode of the second NMOS tube Q2 controls signal for output mode, and second
The source electrode of NMOS tube Q2 is grounded.
In the present embodiment, second switch unit 41 uses the second NMOS tube Q2, is exported in the drain electrode of the first NMOS tube Q1
When low level and interface circuit 30 export low level (when applying low level to the grid of the second NMOS tube Q2), second
The source electrode and drain electrode of NMOS tube Q2 is ended so that the drain electrode of the 2nd NMOS pipes Q2 exports high level.In the leakage of the first NMOS tube Q1
When pole exports low level and the output high level of interface circuit 30 (when applying high level to the grid of the second NMOS tube Q2),
The source electrode and drain electrode of 2nd NMOS pipes Q2 is ended so that the drain electrode of the second NMOS tube Q2 exports low level.Utilize NMOS pipes one
Aspect can facilitate output mode to control signal, and then control electronics start normal boot-strap pattern or reforestation practices.Separately
On the one hand, NMOS power consumptions are very low, further reduce the consumption of electric energy.
It should be appreciated that above-mentioned NMOS tube can be substituted for PMOS tube, and when being substituted for PMOS tube, the source electrode of PMOS tube
Power supply should be connect.In addition, PMOS tube can also change other devices with switch control module function, those skilled in the art into
It can be selected according to actual demand.
In one of the embodiments, such as Fig. 3, interface circuit 30 includes the 4th resistance R4 and data-interface 31；Number connects
Mouthfuls 31 by the grid of the 4th resistance R4 the second NMOS tubes of connection Q2, and number of the digital interface for accessing computer equipment
Word interface, when digital interface accesses the digital interface of computer equipment, it is second that computer equipment, which is by the 4th resistance R4,
The grid of NMOS tube Q2 provides power supply VCC3.
Specifically, interface circuit 30 is mainly used for providing high level or low level signal for the grid of the second NMOS tube Q2.
Data-interface 31 and the digital interface for accessing computer equipment are all usually USB interface, when data-interface 31 and computer equipment
When data-interface connects and switch control module is closed, power supply VCC3 is only high level, in switch control module disconnection and data
When interface 31 does not connect with the digital interface of access computer equipment, power supply VCC3 is low level (being 0).When in the first NMOS
When pipe Q1 cut-offs (i.e. drain electrode output low level) and the output low level of data-interface 31, the second NMOS tube Q2 cut-offs export high electricity
It is flat；In the first NMOS tube Q1 cut-offs (i.e. drain electrode output low level) and the output high level of data-interface 31, the second NMOS tube
Q2 is opened, and exports low level, to according to the startup of the high level or low level control electronic equipment of the second NMOS tube Q2 outputs
Different patterns.
In one of the embodiments, as shown in figure 3, switch control module is key switch, one end of key switch is logical
Cross first resistor R1 connection the first power supply VCC1, and by the grid of second resistance R2 the first NMOS tubes of connection, key switch
The other end is grounded.
Specifically, when key switch is pressed (is closed) every time, the first NMOS tube Q1 just exports low level signal,
When interface circuit 30 exports high level or low level so that the second NMOS tube Q2 output low levels or high level, to control electricity
The startup different mode of sub- equipment.
Optionally, key switch is the power button on electronic equipment, is selected using the start-up mode in the embodiment of the present invention
Selecting circuit only needs operation power button just and can make electronic equipment to start different patterns, on the one hand easy to operate；Another party
Recovery button need not be also separately provided in face on an electronic device, reduce the volume of board in electronic equipment, cost-effective.
Start-up mode selection circuit to facilitate the understanding of the present invention provides a more detailed embodiment.Such as Fig. 3 institutes
Show, a kind of start-up mode selection circuit, including the first NMOS tube Q1, the 2nd NMOS pipes Q2, the electricity of first resistor R1 to the 4th
It is to connect to hinder R4, USB interface (i.e. data-interface, data-interface here select USB interface in Fig. 3) and key switch K1, VCC
Enter voltage, and VCC_USB (i.e. VCC3 in Fig. 3, when data-interface selects USB interface, VCC3 VCC_USB) it is electronic equipment
Voltage when being connect with access computer equipment by USB interface, when electronic equipment is not connect with access computer equipment,
VCC_USB is 0.The operation principle of the start-up mode selection circuit is：
When electronic equipment does not access the USB interface of computer equipment, power supply VCC1 and VCC2 are not that 0, VCC_USB is
0, the VGS of the first NMOG pipes Q1 is more than threshold voltage, Q1 conductings at this time；And the G pole tensions of the second NMOS tube Q2 are 0V, Q2 is cut
Only, electronic equipment is in off-mode at this time.Switch control module K1 (being closed K1) is pushed button, the poles the G ground connection of Q1, is low
Level, Q1 cut-offs, at this point, VCC_USB is still the extremely low level of G of 0, Q2, the drain electrode of Q2 cut-offs, Q2 exports high level (i.e. mould
Formula controls signal), control electronics start normal boot-strap pattern (i.e. electronic equipment normal boot-strap).When equipment starts booting mould
After formula (after being switched on), the high level of G of key switch K1, Q1, Q1 conductings are disconnected, at this point, the poles G of Q2 are always low level,
The drain electrode of Q2 exports high level always, and electronic equipment will not enter reforestation practices by false triggering.
When electronic equipment accesses the USB interface of computer equipment, power supply VCC1, VCC2 and VCC_USB is not at this time
0.Push button switch K1 (being closed K1), the G extremely low levels of Q1, Q1 cut-offs, due to VCC_USB be not the G of 0, Q2 extremely
The drain electrode of high level, Q2 conductings, Q2 exports low level, and control electronics start reforestation practices.Computer equipment can detect
Upgrade maintenance is carried out to electronic equipment, and to electronic equipment.
After equipment starts reforestation practices (after opening), the high level of G of key switch K1, Q1 are disconnected, Q1 is connected,
Q1 is connected, at this time the G of Q2 extremely low levels, and Q2 cut-offs, the drain electrode of Q2 persistently exports high level, and it is extensive will not to be triggered again startup
Complex pattern.
According to above-mentioned start-up mode selection circuit, the present invention also provides a kind of electronic equipment.
A kind of electronic equipment includes the start-up mode selection circuit of any one embodiment, wherein start-up mode selection circuit
Equipment and electronic equipment internal.
For above-mentioned electronic equipment because using the start-up mode selection circuit in any one embodiment, which can be with
Easily enter reforestation practices or normal boot-strap pattern, it is easy to operate.
Each technical characteristic of above example can be combined arbitrarily, to keep description succinct, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield is all considered to be the range of this specification record.
Only several embodiments of the present invention are expressed for above example, the description thereof is more specific and detailed, but can not
Therefore it is construed as limiting the scope of the patent.It should be pointed out that for those of ordinary skill in the art,
Under the premise of not departing from present inventive concept, various modifications and improvements can be made, these are all within the scope of protection of the present invention.
Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of start-up mode selection circuit, which is characterized in that including：Switch control module, mode selection circuit, interface circuit
And mode control circuit；
The switch control module connects the mode control circuit by the mode selection circuit；The interface circuit it is defeated
Outlet connects the mode control circuit, and the input terminal of the interface circuit is used to access the digital interface of computer equipment,
When the input terminal of the interface circuit accesses the digital interface of the computer equipment, the computer equipment is interface electricity
Road powers；
The mode selection circuit is according to the switch control signal output mode selection signal of the switch control module to described
Mode control circuit；
When the input terminal of the interface circuit accesses or does not access the digital interface of computer equipment, the interface circuit output
Corresponding interface signal is to the mode control circuit；
The mode control circuit controls signal according to the mode select signal and corresponding interface signal output mode,
The mode control signal, which is used to indicate, uses the electronic equipment of the start-up mode selection circuit to start reforestation practices or normal
Power on mode.
2. start-up mode selection circuit according to claim 1, which is characterized in that the switch control signal is low level
Signal；
When the switch control signal is low level signal, the mode selection circuit exports low level；
When the input terminal of the interface circuit accesses the digital interface of the computer equipment, the high electricity of interface circuit output
Ordinary mail number；
When the input terminal of the interface circuit does not access the digital interface of the computer equipment, the interface circuit output is low
Level signal；
When the mode selection circuit exports low level and the interface signal exports low level signal, the scheme control
Circuit output high level；
When the mode selection circuit exports low level and the interface signal exports high level signal, the scheme control
Circuit output low level.
3. start-up mode selection circuit according to claim 2, which is characterized in that the switch control signal is high level
Signal；
When the switch control signal is high level signal, the mode selection circuit exports high level；
When the mode selection circuit exports high level and the interface signal is high level signal, the scheme control electricity
Road exports high level.
4. according to claim 1-3 any one of them start-up mode selection circuits, which is characterized in that the mode selection circuit
Including first resistor, second resistance and first switch unit；
One end of the first resistor connects the input terminal of the first switch unit by the second resistance, and by described
Switch control module is grounded；The other end of the first resistor is for connecting the first power supply；The output of the first switch unit
End connects the mode control circuit.
5. start-up mode selection circuit according to claim 4, which is characterized in that the mode control circuit includes second
Switch unit and 3rd resistor；
The input terminal of the second switch unit is separately connected the output end of the first switch unit and the interface circuit
The output end of output end, the second switch unit connects second source, and the second switch list by the second resistance
The output end of member is for exporting the mode control signal.
6. start-up mode selection circuit according to claim 5, which is characterized in that the first switch unit includes first
NMOS tube；
One end of the first resistor connects the grid of first NMOS tube by the second resistance, and passes through the switch
Control module is grounded；The other end of the first resistor is for connecting the first power supply；The drain electrode of first NMOS tube connects institute
State the input terminal of second switch unit 42, the source electrode ground connection of first NMOS tube.
7. start-up mode selection circuit according to claim 6, which is characterized in that the second switch unit includes second
NMOS tube；
The grid of second NMOS tube is separately connected the output end of the grid and the interface circuit of first NMOS tube, institute
The drain electrode for stating the second NMOS tube connects second source by the second resistance, and the drain electrode of second NMOS tube is for exporting
The mode control signal, the source electrode ground connection of second NMOS tube.
8. start-up mode selection circuit according to claim 7, which is characterized in that the interface circuit includes the 4th resistance
And digital interface；
The digital interface connects the grid of second NMOS tube by the 4th resistance；
The digital interface is used to access the digital interface of the computer equipment.
9. start-up mode selection circuit according to claim 5 or 6, which is characterized in that the switch control module be by
One end of key switch, the key switch connects first power supply by the first resistor, and passes through the second resistance
Connect the grid of first NMOS tube, the other end ground connection of the key switch.
10. a kind of electronic equipment, which is characterized in that including claim 1-9 any one of them start-up mode selection circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810259511.3A CN108519892B (en) | 2018-03-27 | 2018-03-27 | Start mode selection circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810259511.3A CN108519892B (en) | 2018-03-27 | 2018-03-27 | Start mode selection circuit and electronic equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108519892A true CN108519892A (en) | 2018-09-11 |
| CN108519892B CN108519892B (en) | 2021-03-23 |
Family
ID=63433010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810259511.3A Active CN108519892B (en) | 2018-03-27 | 2018-03-27 | Start mode selection circuit and electronic equipment |
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| CN108519892B (en) | 2021-03-23 |
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