CN203827309U - Reset signal generating circuit and electronic apparatus - Google Patents
Reset signal generating circuit and electronic apparatus Download PDFInfo
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- CN203827309U CN203827309U CN201420121402.2U CN201420121402U CN203827309U CN 203827309 U CN203827309 U CN 203827309U CN 201420121402 U CN201420121402 U CN 201420121402U CN 203827309 U CN203827309 U CN 203827309U
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Abstract
The utility model discloses a reset signal generating circuit and an electronic apparatus. The reset signal generating circuit is connected with a multiplexing key with resetting and control functions and an external control triggering circuit; and the reset signal generating circuit generates and outputs reset signals to perform reset control on a system when the multiplexing key is pressed, and the external control triggering circuit is triggered. According to the reset signal generating circuit of the utility model, key multiplexing techniques are adopted to design the reset circuit, the structural design of the electronic apparatus can be simplified, and miniaturization and portable convenience of the electronic apparatus can be benefited; a brand new reset control operation mode in which one kind of key triggering and other kinds of external operation triggering are combined together is adopted, and therefore, problems of inconstant delay time and poor consistency of reset control existing in a traditional multiplexing key delay time reset method can be solved, and a fast and reliable reset function of the electronic apparatus can be realized.
Description
Technical field
The utility model belongs to electronic circuit technology field, relates to a kind of reset circuit, specifically, relates to a kind of circuit structure design for generation of reset signal and adopts the electronic equipment of this reset signal generating circuit design.
Background technology
Reset circuit is that one is widely used in electronic equipment, for improving the custom-designed basic circuit of electronic equipment reliability of operation.When being subject to the reason such as external interference or software BUG to cause program fleet fault, can make electronic equipment recover normal operating state at electronic equipment by reset.Existing reset circuit design adopts two kinds of forms conventionally: one is to design independently reset key, is specifically designed to reset operation, for example, on some electronic equipment, be designed with reset pin hole, and by triggering the reset key in pin hole, control system resets; Another kind is by the button multiplexing of reset key and a certain other functions, and adopts the mode control system time-delay reset of pressing for a long time this multiplexing button.
Above-mentioned two kinds of reset circuit design methods respectively have the pluses and minuses of himself: for the reset circuit that adopts the design of individual reset button, although in method for designing simply, easily realize, but can cause electronic equipment more complicated on contour structures, be unfavorable for the design of waterproof antistatic, and for the portable type electronic product of pursuing small size, increase the increase that a button tends to cause whole small product size, be therefore unfavorable for the Miniaturization Design of portable product.For the reset circuit that adopts multiplexing button time-delay reset method design, although can effectively solve the problems referred to above that independent button repositioning method exists, but sort circuit design is very easily subject to the impact of temperature and discrete component parameter, thereby cause delay time unfixing, the consistency that reset is controlled is poor, due to the shutdown that leads to system abnormity of button overlong time, then affect user's experience sometimes.
Summary of the invention
The utility model has proposed a kind of circuit design for generation of reset signal based on button multiplexing technology, in simplifying product structure design, has guaranteed the quick and reliability of reset operation.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of reset signal generating circuit, is applied in electronic equipment, is provided with and controls the multiplexing button of function and the external control circuits for triggering for detection of other peripheral operations except button operation with resetting in described electronic equipment; Described reset signal generating circuit connects described multiplexing button and external control circuits for triggering, presses and when external control trigger circuit triggers generating reset signal output at multiplexing button.
Preferably, described external control circuits for triggering are the charging inlet for connecting external power cord, or are for receiving the wireless charging receiver module of radio source, or are for responding to the approaching NFC module of outside NFC equipment; Described external control circuits for triggering, in the time detecting that peripheral operation triggers, change it for connecting the level state of interface of reset signal generating circuit.
Connect the situation of high level for multiplexing button, can design in the following ways described reset signal generating circuit,
The first switching circuit is set in described reset signal generating circuit, the control end of the first switching circuit is connected to described external control circuits for triggering, one end of switch ways connects high level by described multiplexing button, and the other end connects the reset signal output for exporting described reset signal or connects described reset signal output by a negater circuit.
For the reset signal of production burst form, connect in the circuit of external control circuits for triggering further series coupled electric capacity at the control end of described the first switching circuit, at external control circuits for triggering when detecting that peripheral operation triggers the level state that changes interface described in it, coupling capacitance conducting, generate reset pulse, control system parking position accuracy; The other end of described switch ways is passed through to pull down resistor ground connection.
Further, in described negater circuit, be provided with second switch circuit, the control end of second switch circuit connects the switch ways of the first switching circuit, switch ways one end ground connection of second switch circuit, the other end connects DC power supply by pull-up resistor, and connects described reset signal output.
For described external control circuits for triggering detect peripheral operation trigger time, export the situation of high level for connecting the interface of reset signal generating circuit by it, as the preferred physical circuit design of one of described reset signal generating circuit, one NPN type triode can be set in described the first switching circuit, the base stage of NPN type triode is connected to described external control circuits for triggering by the coupling capacitance of series connection, collector electrode connects high level by described multiplexing button, emitter is by described pull down resistor ground connection, and the described reset signal output of connection, can export thus the effective reset signal of high level.
As another preferred physical circuit design of described reset signal generating circuit, a NPN type triode can be set in described the first switching circuit, the 2nd NPN type triode is set in described second switch circuit; The base stage of the one NPN type triode is connected to described external control circuits for triggering by the coupling capacitance of series connection, collector electrode connects high level by described multiplexing button, emitter is by pull down resistor ground connection, and connect the base stage of the 2nd NPN type triode, the grounded emitter of the 2nd NPN type triode, collector electrode connects DC power supply by pull-up resistor, and connects described reset signal output, thus can the effective reset signal of output low level.
Connect low level situation for multiplexing button, can design in the following ways described reset signal generating circuit,
The first switching circuit and the first negater circuit are set in described reset signal generating circuit, the control end of the first switching circuit connects described external control circuits for triggering, one end of switch ways connects the output of the first negater circuit, the input of the first negater circuit connects low level by described multiplexing button, and the other end of switch ways connects the reset signal output for exporting described reset signal or connects described reset signal output by the second negater circuit.
For the reset signal of production burst form, can connect in the circuit of external control circuits for triggering further series coupled electric capacity at the control end of described the first switching circuit, at external control circuits for triggering when detecting that peripheral operation triggers the level state that changes interface described in it, coupling capacitance conducting, generate reset pulse, control system parking position accuracy; The other end of described switch ways is passed through to pull down resistor ground connection.
Further, the input of described the first negater circuit connects DC power supply by pull-up resistor.
Based on the method for designing of above-mentioned reset signal generating circuit, the utility model has also proposed a kind of electronic equipment that adopts the design of described reset signal generating circuit, comprises and controls the multiplexing button of function, external control circuits for triggering and reset signal generating circuit for detection of other peripheral operations except button operation with resetting; Described reset signal generating circuit connects described multiplexing button and external control circuits for triggering, presses and when external control trigger circuit triggers generating reset signal output at multiplexing button.
Compared with prior art, advantage of the present utility model and good effect are: multiplexed signals of the present utility model produces circuit and adopts button multiplexing technology, utilize a certain function button on electronic equipment to be also used as reset key, be applied in the operating process of system reset control, thereby simplifying the design of electronic equipment contour structures, when being conducive to the Miniaturized portable design of electronic product, trigger with other peripheral operations the brand-new reset control operation mode combining by introducing a kind of button triggering, in during multiplexing button is pressed by further insertion power line or open wireless charging device or utilize NFC equipment to approach other methods of operation such as described electronic equipment to control the generation of reset signal, thereby it is unfixing to efficiently solve the existing delay time of traditional multiplexing button time-delay reset method, the problems such as the control consistency that resets is poor, realize the reset function of system fast and reliable.
Read by reference to the accompanying drawings after the detailed description of the utility model execution mode, other features of the present utility model and advantage will become clearer.
Brief description of the drawings
Fig. 1 is the general frame schematic diagram of the reset signal generating circuit that proposes of the utility model;
Fig. 2 is the reset operation schematic diagram of a kind of embodiment based on reset signal generating circuit shown in Fig. 1;
Fig. 3 is the reset operation schematic diagram of the another kind of embodiment based on reset signal generating circuit shown in Fig. 1;
Fig. 4 is the physical circuit schematic diagram of the first embodiment of reset signal generating circuit shown in Fig. 1;
Fig. 5 is the corresponding signal timing diagram of reset signal generating circuit shown in Fig. 4;
Fig. 6 is the physical circuit schematic diagram of the second embodiment of reset signal generating circuit shown in Fig. 1;
Fig. 7 is the corresponding signal timing diagram of reset signal generating circuit shown in Fig. 6;
Fig. 8 is the physical circuit schematic diagram of the third embodiment of reset signal generating circuit shown in Fig. 1;
Fig. 9 is the corresponding signal timing diagram of reset signal generating circuit shown in Fig. 8;
Figure 10 is the physical circuit schematic diagram of the 4th kind of embodiment of reset signal generating circuit shown in Fig. 1;
Figure 11 is the corresponding signal timing diagram of reset signal generating circuit shown in Figure 10.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in more detail.
The utility model is in order to simplify the structural design of electronic equipment, adopt button multiplexing technology, selecting a certain function button on electronic equipment (can be switching on and shutting down button, volume adjusting button etc.) be also used as reset key, carry out the structural design of reset circuit, and further coordinate external control circuits for triggering in electronic equipment whether to have other peripheral operations except button operation to be performed in detecting during this multiplexing button is pressed, determine whether thus generating reset signal, for the reset control of circuit system, to realize the reset function of electronic equipment fast and reliable.
For realizing above-mentioned purpose of design, the utility model, in the structural design of reset circuit, need to design for above-mentioned brand-new reset operation mode a kind of reset signal generating circuit of brand new, controls required reset signal RESET to generate to reset.Described reset signal generating circuit is connected to respectively and controls the multiplexing button of function and described external control circuits for triggering with resetting, when detect described multiplexing button press during in, external control circuits for triggering have also detected when other peripheral operations trigger simultaneously, generate effective reset signal RESET, export circuit system to, for example export the control end that is connected to the switching device in master chip supply line in circuit system to, by controlling described switching device action, with the power supply of insantaneous break master chip, control master chip power-off reset, realize the parking position accuracy function of circuit system, shown in Figure 1.
For described other peripheral operations except button operation, can be to insert power line to the charging inlet of electronic equipment, electronic equipment is carried out to charging operations; Also can be to start outside radio source, electronic equipment is carried out to wireless charging operation; Can also be to utilize outside NFC equipment to remove to approach described electronic equipment, electronic equipment is carried out to NFC read-write operation; Etc..
In the time selecting the reset operation mode of multiplexing button+insertion power line, in conjunction with Fig. 1, shown in Fig. 2, in the time that user need to carry out reset operation to electronic equipment, can first pin the multiplexing button 103 for resetting and controlling on electronic equipment 101, then power line 102 is inserted on the charging inlet of electronic equipment 101, make charge power supply transfer to reset signal generating circuit via charging inlet, or receiving after charge power supply, change the level state that it is connected to the interface of reset signal generating circuit, it is the level state of Vo, control thus reset signal generating circuit and generate effective reset signal RESET, control system circuit parking position accuracy.
In the time selecting the reset operation mode of multiplexing button+startup radio source, shown in Fig. 1, Fig. 3, in the time that user need to carry out reset operation to electronic equipment, can first pin the multiplexing button 103 for resetting and controlling on electronic equipment 101, then open outside radio source 104, make the charge power supply of radio source 104 emitting electromagnetic wave forms, for electronic equipment 101 charges.Utilize electromagnetic induction principle, the wireless charging receiver module in electronic equipment 101 is sensing after electromagnetic coupling energy, electromagnetic coupling energy is carried out to rectifying and voltage-stabilizing processing, for electronic equipment provides charge power supply.Described charge power supply is used for to reset and controls, coordinate the trigger action of multiplexing button 103 to complete reset function.In the utility model, described wireless charging receiver module can select the BQ51013 chip of Ti company or other wireless charging module to realize, sensing after electromagnetic coupling energy, change the level state that it exports the signal Vo of reset signal generating circuit to, and then control reset signal generating circuit generate effective reset signal RESET, realize the reset function of electronic equipment fast and reliable.
In the time selecting the approaching reset operation mode of multiplexing button+NFC equipment, shown in Fig. 1, Fig. 3, in the time that user need to carry out reset operation to electronic equipment, can first pin on electronic equipment 101 the multiplexing button 103 of controlling for resetting, then utilize outside NFC equipment (104 in Fig. 3 also can be used for representing NFC equipment) to remove to approach described electronic equipment 101.In the time that the NFC module in electronic equipment 101 senses the electromagnetic energy of outside NFC equipment read-write operation coupling, change the level state that it exports the signal Vo of reset signal generating circuit to, and then control reset signal generating circuit and generate effective reset signal RESET, realize circuit system is in time reliably resetted and controlled.In the utility model, described NFC module can select the NFC chip of the producer such as NXP or Broadcom to carry out the specific design of circuit.
Described charging inlet, wireless charging receiver module and NFC module can and be deposited in electronic equipment, also can select wherein one or more to be laid in described electronic equipment, to coordinate multiplexing button 103 to complete the reset control function to circuit system.User is in the time carrying out reset operation, can in pressing multiplexing button 103, select the wherein one of above-mentioned three kinds of peripheral operations to trigger arbitrarily, immediately reset with control system circuit, or coordinate multiplexing button 103 to complete reset operation according to the predefined a certain fixed outer mode of operation of electronic equipment.
Certainly, for different electronic equipments, also can select the mode control reset signal generating circuit of multiplexing button+other peripheral operations to generate effective reset signal RESET, complete the reset function of electronic equipment, the utility model is not limited in above giving an example.
Because the utility model is in the time designing reset signal generating circuit, the generation of reset signal is without the time delay Trigger Function by delay circuit, therefore, solve the reset circuit of the multiplexing button design of traditional employing because the delay time of generating reset signal is unfixing, the poor problem of reset control consistency causing.
Below by four specific embodiments, physical circuit assembling structure and the operation principle thereof of the reset signal generating circuit that the utility model is proposed are at length set forth.
Embodiment mono-, the reset signal generating circuit of the present embodiment is applicable to multiplexing by keyed jointing high level, the effective situation of reset signal high level.
Shown in Figure 4, for some electronic equipment, what the multiplexing button SW1 that being used for resets controls likely connected in the design of system key circuit is high level, for example, connect DC power supply VCC, in the time that multiplexing button SW1 presses, the button detection signal Vbutton of output is high level.For this situation, the present embodiment adopts a switching circuit (hereinafter referred to as the first switching circuit) to design described reset signal generating circuit, produces the effective reset signal RESET of high level, for the reset control of circuit system.
Specifically, the control end of described the first switching circuit can be connected to external control circuits for triggering, receive the signal Vo of external control circuits for triggering output; One end of the switch ways of the first switching circuit is connected to described multiplexing button SW1, and connect DC power supply VCC by described multiplexing button SW1, the other end is by pull down resistor R3 ground connection, and connection is for exporting the reset signal output J2 of reset signal RESET.
In order to prevent producing mistake homing action by described multiplexing button in the situation that having peripheral operation, produce the homing action that should not occur such as use described multiplexing button in charging process, the present embodiment is the interface for output signal Vo at the control end of the first switching circuit and the interface J1(of external control circuits for triggering) between the coupling capacitance C1 that connects, utilize coupling capacitance C1 every straight effect, control only (described level saltus step only refers to the change that external control circuits for triggering carry out the level state of signal Vo in the time detecting that peripheral operation is carried out) the controlled conducting in the time that level saltus step occurs signal Vo of the first switching circuit, export the pulse signal of saltus step from low to high, as effective reset signal RESET, control system circuit Rapid reset.
Shown in Fig. 5, in the time that multiplexing button SW1 presses, button detection signal Vbutton is set to high level, during this period, if user inserts power line on charging inlet, or having opened radio source charges to electronic equipment, or utilize a NFC equipment to carry out read-write operation to described electronic equipment, become high level by the signal Vo of charging inlet or wireless charging receiver module or the output of NFC module by low transition, now signal Vo acts on the control end of the first switching circuit by coupling capacitance C1, control the first switching circuit conducting, make the electric current of DC power supply VCC output transfer to pull down resistor R3 by the switch ways of multiplexing button SW1 and the first switching circuit, form high level at pull down resistor R3 two ends, and then by the effective reset signal RESET of reset signal output J2 output high level.
Because signal Vo is direct current signal, coupling capacitance C1 has buffer action to direct current signal, therefore, is stabilized in after high level at signal Vo, and coupling capacitance C1 turn-offs immediately, makes the first switching circuit after conducting, proceed to soon again cut-off state.After the first switching circuit cut-off, the voltage vanishing at pull down resistor R3 two ends, and then reset signal RESET by reset signal output J2 output again saltus step be invalid low level state.Thus one, be actually the pulse signal of a saltus step from low to high by the reset signal RESET of reset signal output J2 output, RESET waveform as shown in Figure 5, utilizes described reset pulse control system circuit instant reset, can improve thus the reliability of system reset control.
As a kind of preferred circuit design of the present embodiment, preferably adopt a NPN type triode Q1 to coordinate simple periphery circuit design to form for the first described switching circuit, shown in Figure 4.
The base stage of described NPN type triode Q1 is connected to the interface J1 of external control circuits for triggering by the coupling capacitance C1 of series connection, and by pull down resistor R1 ground connection; The collector electrode of NPN type triode Q1 is connected to described multiplexing button SW1 by the current-limiting resistance R2 of series connection, and be connected to DC power supply VCC by described multiplexing button SW1; The emitter of NPN type triode Q1 is passed through to pull down resistor R3 ground connection, and connect described reset signal output J2, to export the effective reset signal RESET of high level.In further parallel filtering capacitor C 2 of the two ends of described pull down resistor R3, with filtering interference signals, reset signal generating circuit is caused to interference effect.
The operation principle of reset signal generating circuit shown in Fig. 4 is: in the time that multiplexing button SW1 presses, DC power supply VCC acts on the collector electrode of NPN type triode Q1 by multiplexing button SW1, current-limiting resistance R2, makes the collector potential of NPN type triode Q1 for high.During this period, if user has inserted power line, for example USB line or other forms of power line, be linked into charge power supply in system; Or having opened radio source is electronic equipment charging; Also or use NFC equipment to carry out NFC read-write operation to electronic equipment; Now coupling capacitance C1 conducting, makes the base potential of NPN type triode Q1 become high level, and then controls NPN type triode Q1 saturation conduction.After NPN type triode Q1 saturation conduction, the electric current of exporting by DC power supply VCC transfers to pull down resistor R3 via the collector and emitter of multiplexing button SW1, current-limiting resistance R2 and NPN type triode Q1, by the effective reset signal RESET of reset signal output J2 output high level.
When user only presses multiplexing button SW1, and while not carrying out other peripheral operations, because the current potential of interface J1 keeps low level, the base potential of NPN type triode Q1 is by pull down resistor R1 ground connection, make NPN type triode Q1 because its base potential is the low off state that keeps, now the current potential of reset signal output J2 is low, without effectively reset signal RESET output.Utilize the controller in circuit system to receive described button detection signal Vbutton, detecting that described button detection signal Vbutton is continuously height within the time period of setting, and during without effective reset signal RESET output, carry out corresponding other functions except resetting controlling of described multiplexing button SW1, such as switching on and shutting down control function or volume adjusting control function etc., response user's button operation.
And (for example insert power line when user only carries out other peripheral operations, or open wireless power supply, or with NFC equipment read-write electronic equipment) or after carrying out other peripheral operations, press again described in multiplexing button SW1 time, for the first situation, NPN type triode Q1 is in the instantaneous conducting during by low uprising of the level of signal Vo, but DC power supply VCC access failure, the current potential of reset signal output J2 still keeps low level.For the second situation, when the level of signal Vo is during by low uprising, the instantaneous conducting of NPN type triode Q1, but DC power supply VCC access failure now, the current potential of reset signal output J2 is low; Afterwards, DC power supply VCC connects, but now the level of signal Vo has been stabilized on high level, therefore coupling capacitance C1 under straight effect, the base potential of NPN type triode Q1 is low, again proceed to off state, make the current potential of reset signal output J2 keep low level state, reset signal RESET is invalid low level.Now, system only responds described peripheral operation, with the instructions for use that meets user's charging or communicate by letter with NFC device pairing.
Certainly, described NPN type triode Q1 also can adopt other components and parts with on-off action such as N-channel MOS pipe or controllable silicon to replace, and carries out the structural design of the first switching circuit, and the present embodiment is not limited in above giving an example.
Embodiment bis-, the reset signal generating circuit of the present embodiment is applicable to multiplexing by keyed jointing high level, the situation of reset signal Low level effective.
Shown in Figure 6, the present embodiment is in order to obtain the reset signal of Low level effective, on the basis of the structural design of the reset signal generating circuit proposing at embodiment mono-, increase a negater circuit, utilize the first described switching circuit and described negater circuit to set up and form described reset signal generating circuit, generate the reset signal/RESET of Low level effective, for the reset control of circuit system.
Specifically, the switch ways that described negater circuit can be connected to the first switching circuit connects in the connection line of described reset signal output J2, for the reset signal of exporting by the first switching circuit being carried out to the reverse process of level, then generate the reset signal/RESET of Low level effective, export by reset signal output J2.
As a kind of preferred design of the present embodiment, described negater circuit can adopt second switch circuit design to form.The control end of second switch circuit is connected to the switch ways of the first switching circuit, by switch ways one end ground connection of second switch circuit, the other end connects described DC power supply VCC or another DC power supply VDD by pull-up resistor R5, and connects the reset signal output J2 of the reset signal/RESET for exporting described Low level effective.
The present embodiment, to have the first described switching circuit of NPN type triode Q1, the Q2 design of on-off action and second switch circuit as example, is described in detail physical circuit assembling structure and the operation principle thereof of described reset signal generating circuit.
Shown in Figure 6, copy the teaming method of the first switching circuit described in embodiment mono-, utilize NPN type triode Q1(hereinafter referred to as a NPN type triode Q1) coordinate pull down resistor R1, current-limiting resistance R2, pull down resistor R3 and filter capacitor C2 to be connected to form the first described switching circuit, its concrete annexation and operation principle are referring to the associated description in embodiment mono-.
The interface J1 that the base stage of the one NPN type triode Q1 is connected to external control circuits for triggering by the coupling capacitance C1 of series connection, collector electrode connects described multiplexing button SW1 by the current-limiting resistance R2 of series connection, and connects DC power supply VCC by described multiplexing button SW1.The emitter of the one NPN type triode Q1 is connected to the base stage of the 2nd NPN type triode Q2 by resistance R 4, and by the grounded emitter of the 2nd NPN type triode Q2, collector electrode connects DC power supply VDD by pull-up resistor R5, and connects described reset signal output J2.
The operation principle of reset signal generating circuit shown in Fig. 6 is: in circuit system initial condition, multiplexing button SW1 does not press, when described external control circuits for triggering do not detect user's respective external operation yet; Or in the time that user only presses multiplexing button SW1 and does not carry out other peripheral operations; Or press again described multiplexing button SW1 after user has only carried out the corresponding peripheral operation of described external control circuits for triggering or carried out described peripheral operation time, because the level of the emitter output by a NPN type triode Q1 is low level, therefore, the 2nd NPN type triode Q2 keeps off state.Now, DC power supply VDD acts on described reset signal output J2 by pull-up resistor R5, and putting reset signal/RESET is invalid high level state, not to the circuit system control that resets.
In the time that multiplexing button SW1 presses, button detection signal Vbutton is high level by low transition, DC power supply VCC acts on the collector electrode of a NPN type triode Q1 by multiplexing button SW1, current-limiting resistance R2, make the collector potential of a NPN type triode Q1 for high.During this period, if user has carried out other peripheral operations, when the signal Vo that makes to export by external control circuits for triggering is high level by low transition, coupling capacitance C1 conducting in the time of the level generation saltus step of signal Vo, make the base potential of a NPN type triode Q1 become high level, and then control a NPN type triode Q1 saturation conduction.After a NPN type triode Q1 saturation conduction, the electric current of exporting by DC power supply VCC is via multiplexing button SW1, the collector and emitter of current-limiting resistance R2 and a NPN type triode Q1 transfers to pull down resistor R3, make the base potential of the 2nd NPN type triode Q2 become high level, and then control the 2nd NPN type triode Q2 saturation conduction, drag down the collector potential of the 2nd NPN type triode Q2, thereby make to become low level by the reset signal/RESET of reset signal output J2 output from high level, forming by high level saltus step is low level pulse signal, signal waveform shown in Figure 7, circuit system is carried out fast, reset and control reliably.
Certainly, described negater circuit also can adopt logic inverter or other analogue devices with on-off action to carry out the specific design of circuit structure, and the present embodiment is not limited in above giving an example.
Embodiment tri-, the reset signal generating circuit of the present embodiment is applicable to multiplexing by keyed jointing low level, the effective situation of reset signal high level.
Shown in Figure 8, for some electronic equipment, what the multiplexing button SW1 that being used for resets controls likely connected in the design of system key circuit is electronegative potential, for example ground connection, in the time that multiplexing button SW1 presses, the button detection signal Vbutton of output is low level.For this situation, the present embodiment adopts the first switching circuit and the described reset signal generating circuit of the first negater circuit design, first button detection signal Vbutton is carried out to level conversion by the first negater circuit, then transfer to the switch ways of the first switching circuit, utilize the interface J1 output signal Vo of external control circuits for triggering to control the first switching circuit conducting, and then produce the effective reset signal RESET of high level, for the reset control of circuit system.
Specifically, the control end of the first switching circuit can be connected to interface J1 by the coupling capacitance C1 of series connection, receive the signal Vo that external control circuits for triggering are exported by interface J1; One end of the switch ways of the first switching circuit is connected to the output of the first negater circuit, the input of the first negater circuit passes through described multiplexing button SW1 ground connection, and connects DC power supply VCC by pull-up resistor R6; The other end of described switch ways is passed through to pull down resistor R3 ground connection, and connect the reset signal output J2 for exporting reset signal RESET.
As a kind of preferred circuit design of the present embodiment, the first switching circuit can copy the NPN type triode Q1 that embodiment mono-proposes to coordinate pull down resistor R1, current-limiting resistance R2, pull down resistor R3 and filter capacitor C2 to be formed by connecting, and its concrete annexation and operation principle are referring to the associated description in embodiment mono-.
The first negater circuit can adopt a positive-negative-positive triode Q3 to coordinate pull down resistor R7, DC power supply VCC to be formed by connecting, shown in Figure 8.The base stage of positive-negative-positive triode Q3 is connected to DC power supply VCC by pull-up resistor R6, and by multiplexing button SW1 ground connection; The emitter of positive-negative-positive triode Q3 is connected to DC power supply VCC, and collector electrode passes through pull down resistor R7 ground connection, and described collector electrode is connected to the collector electrode of a NPN type triode Q1 by current-limiting resistance R2.
In the time that multiplexing button SW1 does not press, button detection signal Vbutton is high level, DC power supply VCC is under the effect of pull-up resistor R6, put the base potential of positive-negative-positive triode Q3 for high, controlling positive-negative-positive triode Q3 cut-off turn-offs, pull down resistor R7 drags down its collector potential, and it is low making the collector potential of a NPN type triode Q1.Now, the signal Vo no matter exporting by interface J1 has or not generation level to change, and is invalid low level state by the reset signal RESET of reset signal output J2 output.
After multiplexing button SW1 presses, button detection signal Vbutton becomes low level, drags down the base potential of positive-negative-positive triode Q3, controls positive-negative-positive triode Q3 saturation conduction.Now, DC power supply VCC transfers to the collector electrode of a NPN type triode Q1 by positive-negative-positive triode Q3, current-limiting resistance R2.During this period, if user has carried out other peripheral operations, making the level at interface J1 place is high level by low transition, now coupling capacitance C1 conducting, control a NPN type triode Q1 saturation conduction, thereby make to become high level by the reset signal RESET of reset signal output J2 output by low transition, form the pulse signal of saltus step from low to high, shown in Figure 9, realize the reset control to circuit system.
Certainly, described the first negater circuit also can adopt logic inverter or other analogue devices (such as P channel MOS tube or controllable silicon etc.) with on-off action to carry out the specific design of circuit, and the present embodiment is not limited in above giving an example.
Embodiment tetra-, the reset signal generating circuit of the present embodiment is applicable to multiplexing by keyed jointing low level, the situation of reset signal Low level effective.
On the basis of the structural design of the reset signal generating circuit that the reset signal generating circuit of the present embodiment only need propose at embodiment tri-, increase by the second negater circuit, the switch ways that is connected to the first switching circuit connects in the connection line of described reset signal output J2, can complete the overall construction design of reset signal generating circuit.
Shown in Figure 10, described the second negater circuit can copy concrete structure and the connected mode of the negater circuit proposing in embodiment bis-to design, utilize the 2nd NPN type triode Q2 to coordinate resistance R 4, current-limiting resistance R5 and DC power supply VDD to be connected to form the second described negater circuit, reset signal for the emitter output to by a NPN type triode Q1 is carried out after current potential reverse process, by the effective reset signal/RESET of reset signal output J2 output low level.Wherein Vbutton, Vo and/timing waveform of RESET signal as shown in figure 11.
The specific works principle of the reset signal generating circuit of the present embodiment can be in conjunction with the embodiments two and embodiment tri-in associated description, the present embodiment no longer launches explanation at this.
Certainly; above-mentioned explanation is not to restriction of the present utility model; the utility model is also not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art make in essential scope of the present utility model, also should belong to protection range of the present utility model.
Claims (11)
1. a reset signal generating circuit, is applied in electronic equipment, is provided with and controls the multiplexing button of function and the external control circuits for triggering for detection of other peripheral operations except button operation with resetting in described electronic equipment; It is characterized in that: described reset signal generating circuit connects described multiplexing button and external control circuits for triggering, press and when external control trigger circuit triggers generating reset signal output at multiplexing button;
In described reset signal generating circuit, be provided with the first switching circuit, the control end of the first switching circuit connects described external control circuits for triggering, one end of switch ways connects high level by described multiplexing button, and the other end connects the reset signal output for exporting described reset signal or connects described reset signal output by a negater circuit.
2. reset signal generating circuit according to claim 1, it is characterized in that: described external control circuits for triggering are the charging inlet for connecting external power cord, or be for receiving the wireless charging receiver module of radio source, or be for responding to the approaching NFC module of outside NFC equipment; Described external control circuits for triggering, in the time detecting that peripheral operation triggers, change it for connecting the level state of interface of reset signal generating circuit.
3. reset signal generating circuit according to claim 1 and 2, is characterized in that: in the control end of described the first switching circuit connects the circuit of external control circuits for triggering, be in series with coupling capacitance; The other end of described switch ways is by pull down resistor ground connection.
4. reset signal generating circuit according to claim 3, it is characterized in that: in described negater circuit, be provided with second switch circuit, the control end of second switch circuit connects the switch ways of the first switching circuit, switch ways one end ground connection of second switch circuit, the other end connects DC power supply by pull-up resistor, and connects described reset signal output.
5. reset signal generating circuit according to claim 3, is characterized in that: described external control circuits for triggering, in the time detecting that peripheral operation triggers, are exported high level by it for the interface that connects reset signal generating circuit; In described the first switching circuit, be provided with a NPN type triode, the base stage of NPN type triode connects described external control circuits for triggering by the coupling capacitance of series connection, collector electrode connects high level by described multiplexing button, emitter is by described pull down resistor ground connection, and connect described reset signal output, export the effective reset signal of high level.
6. reset signal generating circuit according to claim 4, is characterized in that: described external control circuits for triggering, in the time detecting that peripheral operation triggers, are exported high level by it for the interface that connects reset signal generating circuit; In described the first switching circuit, be provided with a NPN type triode, in described second switch circuit, be provided with the 2nd NPN type triode; The base stage of the one NPN type triode connects described external control circuits for triggering by the coupling capacitance of series connection, collector electrode connects high level by described multiplexing button, emitter is by pull down resistor ground connection, and connect the base stage of the 2nd NPN type triode, the grounded emitter of the 2nd NPN type triode, collector electrode connects DC power supply by pull-up resistor, and connects described reset signal output, the effective reset signal of output low level.
7. an electronic equipment, is characterized in that: be provided with the reset signal generating circuit as described in any one claim in claim 1 to 6.
8. a reset signal generating circuit, is applied in electronic equipment, is provided with and controls the multiplexing button of function and the external control circuits for triggering for detection of other peripheral operations except button operation with resetting in described electronic equipment; It is characterized in that: described reset signal generating circuit connects described multiplexing button and external control circuits for triggering, press and when external control trigger circuit triggers generating reset signal output at multiplexing button;
In described reset signal generating circuit, be provided with the first switching circuit and the first negater circuit, the control end of the first switching circuit connects described external control circuits for triggering, one end of switch ways connects the output of the first negater circuit, the input of the first negater circuit connects low level by described multiplexing button, and the other end of switch ways connects the reset signal output for exporting described reset signal or connects described reset signal output by the second negater circuit.
9. reset signal generating circuit according to claim 8, it is characterized in that: described external control circuits for triggering are the charging inlet for connecting external power cord, or be for receiving the wireless charging receiver module of radio source, or be for responding to the approaching NFC module of outside NFC equipment; Described external control circuits for triggering, in the time detecting that peripheral operation triggers, change it for connecting the level state of interface of reset signal generating circuit.
10. reset signal generating circuit according to claim 8 or claim 9, is characterized in that: in the control end of described the first switching circuit connects the circuit of external control circuits for triggering, be in series with coupling capacitance; The other end of described switch ways is by pull down resistor ground connection.
11. 1 kinds of electronic equipments, is characterized in that: be provided with the reset signal generating circuit as described in any one claim in claim 8 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420121402.2U CN203827309U (en) | 2014-03-18 | 2014-03-18 | Reset signal generating circuit and electronic apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420121402.2U CN203827309U (en) | 2014-03-18 | 2014-03-18 | Reset signal generating circuit and electronic apparatus |
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| CN203827309U true CN203827309U (en) | 2014-09-10 |
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| CN201420121402.2U Expired - Lifetime CN203827309U (en) | 2014-03-18 | 2014-03-18 | Reset signal generating circuit and electronic apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103825593A (en) * | 2014-03-18 | 2014-05-28 | 青岛歌尔声学科技有限公司 | Reset signal generating circuit and electronic equipment |
| CN107066021A (en) * | 2017-05-15 | 2017-08-18 | 歌尔科技有限公司 | A kind of button multiplexing circuit and electronic equipment |
-
2014
- 2014-03-18 CN CN201420121402.2U patent/CN203827309U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103825593A (en) * | 2014-03-18 | 2014-05-28 | 青岛歌尔声学科技有限公司 | Reset signal generating circuit and electronic equipment |
| CN107066021A (en) * | 2017-05-15 | 2017-08-18 | 歌尔科技有限公司 | A kind of button multiplexing circuit and electronic equipment |
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