CN205229962U - Reset circuit and electronic equipment - Google Patents
Reset circuit and electronic equipment Download PDFInfo
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- CN205229962U CN205229962U CN201520998509.XU CN201520998509U CN205229962U CN 205229962 U CN205229962 U CN 205229962U CN 201520998509 U CN201520998509 U CN 201520998509U CN 205229962 U CN205229962 U CN 205229962U
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Abstract
The utility model discloses a reset circuit and electronic equipment, wherein this reset circuit includes power failure detection module, system control detection module, voltage detection module, peripheral hardware control detection module and the control module that resets, mains voltage that power failure detection module detection achievement power provided exports the first detected signal that resets, system control detection module detects the system control signal and exports the second detected signal that resets, voltage testing detects outside detection voltage and exports the third detected signal that resets, peripheral hardware control detection module detects outside hardware control signal and exports the fourth detected signal that resets, reset control module at the first detected signal that resets, the second detected signal that resets, the third resets detected signal or fourth and resets magnitude of voltage that the detected signal corresponds to the MCU of the system output control signal that resets when being less than predetermined reference voltage, reset with control system. The utility model discloses can realize reseing between local and the external equipment controls alternately.
Description
Technical field
The utility model relates to electronic circuit technology field, particularly relates to a kind of reset circuit and the electronic equipment with this reset circuit.
Background technology
Along with the function of electronic product gets more and more, the hardware circuit module of hardware controls and detection is needed also to get more and more, reset circuit is a wherein hardware circuit module of electronic product, usually the function by detecting reset circuit detects the validity of reset circuit, at present, the electrification reset when function of the reset circuit in electronic product mainly powers on and the system reset controlled by MCU, namely the machine self carries out reset control, cannot control reset circuit reset to the machine by external hardware.
Utility model content
Fundamental purpose of the present utility model is to provide a kind of reset circuit, is intended to the reset realized between the machine and external unit and controls mutual.
In order to achieve the above object, the reset circuit that the utility model provides comprises detection of power loss module, Systematical control detection module, voltage detection module, peripheral hardware control detection module and reset control module; Wherein, described detection of power loss module, Systematical control detection module, voltage detection module, peripheral hardware control detection module and are connected with described reset control module respectively;
The supply voltage that described detection of power loss module testing power supply provides also exports the first reset detection signal to described reset control module, the system control signal that described Systematical control detection module detection system MCU inputs also exports the second reset detection signal to described reset control module, described voltage detection module detects the detection voltage of external unit input and exports the 3rd reset detection signal to described reset control module, described peripheral hardware controls detection module and detects the hardware control signal of external unit input and export the 4th reset detection signal to described reset control module, described reset control module is at described first reset detection signal, second reset detection signal, 3rd reset detection signal or magnitude of voltage corresponding to the 4th reset detection signal export reseting controling signal lower than during the reference voltage preset to described system MCU, reset with control system.
Preferably, described detection of power loss module comprises the first voltage input end, the first triode, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity and the first diode;
Described first voltage input end successively via described first resistance, the second resistance eutral grounding, and successively via described first resistance, the 3rd resistance, the 4th resistance eutral grounding; The emitter of described first triode is connected with the common port of described first resistance and described second resistance, and is connected with the common port of described first resistance and described 3rd resistance; The base stage of described first triode is connected with the common port of described 3rd resistance and described 4th resistance, and the collector of described first triode is via described 5th resistance eutral grounding; Described 3rd electric capacity and described 5th resistor coupled in parallel;
Described first electric capacity and described 3rd resistor coupled in parallel, described second electric capacity and described first Capacitance parallel connection; The negative electrode of described first diode is connected with the collector of described first triode, and the anode of described first diode is connected with the input end of described reset control module.
Preferably, described Systematical control detection module comprises the second voltage input end, system control signal input end, the second triode, the 3rd triode, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance and the tenth resistance;
Described system control signal input end is connected with the base stage of described second triode via described 6th resistance, and via described 7th resistance eutral grounding; The grounded emitter of described second triode, the collector of described second triode is connected with described second voltage input end via described 8th resistance, and is connected via the base stage of described 9th resistance with described 3rd triode; The emitter of described 3rd triode is connected with described second voltage input end, and the collector of described 3rd triode is connected with the input end of described reset control module via described tenth resistance.
Preferably, described reset control module comprises tertiary voltage input end, three terminal regulator, the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance and reseting controling signal output terminal;
The power pins of described three terminal regulator is connected with the output terminal of described Systematical control detection module, and is connected with the output terminal of described detection of power loss module via described 11 resistance, and is connected with described tertiary voltage input end via described 12 resistance; The ground pin ground connection of described three terminal regulator, the output pin of described three terminal regulator is connected with described tertiary voltage input end via described 13 resistance, and is connected with reseting controling signal output terminal via described 14 resistance.
Preferably, described reset control module also comprises the 4th electric capacity, the 5th electric capacity and the 6th electric capacity; One end of described 4th electric capacity is connected with the power pins of described three terminal regulator, the other end ground connection of described 4th electric capacity, described 5th electric capacity and described 4th Capacitance parallel connection; One end of described 6th electric capacity is connected with reseting controling signal output terminal, the other end ground connection of described 6th electric capacity.
Preferably, described voltage detection module comprises at least one voltage detection unit, and described voltage detection unit comprises an external voltage input end and one second diode; The negative electrode of described second diode is connected with described external voltage input end, and the anode of described second diode is connected with the input end of described reset control module.
Preferably, described peripheral hardware controls detection module and comprises at least one peripheral hardware control detecting unit, and described peripheral hardware controls detecting unit and comprises an external control signal input end, a coupling capacitance, a current-limiting resistance and one the 3rd diode; One end of described coupling capacitance is connected with described external control signal input end, the other end of described coupling capacitance is connected via the input end of described current-limiting resistance with described reset control module, the negative electrode of described 3rd diode is connected with the common port of described current-limiting resistance and described coupling capacitance, and the anode of described 3rd diode is connected with the input end of described reset control module.
Preferably, the peripheral hardware that described reset circuit also comprises for exporting peripheral hardware reseting controling signal according to described first reset detection signal or the 3rd reset detection signal controls output module; The input end that described peripheral hardware controls output module is connected with the output terminal of described detection of power loss module, and the output terminal that described peripheral hardware controls output module is connected with the input end of described reset control module.
Preferably, described peripheral hardware control output module comprises the 4th voltage input end, the 4th triode, the 15 resistance, the 16 resistance, the 4th diode and peripheral hardware reset control output end;
The anode of described 4th diode is connected with the output terminal of described detection of power loss module, the negative electrode of described 4th diode is connected via the base stage of described 15 resistance with described 4th triode, the grounded emitter of described 4th triode, the collector of described 4th triode is connected with described peripheral hardware reset control output end, and is connected with described 4th voltage input end via described 16 resistance.
The utility model also provides a kind of electronic equipment, and this electronic equipment comprises system MCU and reset circuit, and described reset circuit is connected with described system MCU; Described reset circuit comprises detection of power loss module, Systematical control detection module, voltage detection module, peripheral hardware control detection module and reset control module; Wherein, described detection of power loss module, Systematical control detection module, voltage detection module, peripheral hardware control detection module and are connected with described reset control module respectively;
The supply voltage that described detection of power loss module testing power supply provides also exports the first reset detection signal to described reset control module, the system control signal that described Systematical control detection module detection system MCU inputs also exports the second reset detection signal to described reset control module, described voltage detection module detects the detection voltage of external unit input and exports the 3rd reset detection signal to described reset control module, described peripheral hardware controls detection module and detects the hardware control signal of external unit input and export the 4th reset detection signal to described reset control module, described reset control module is at described first reset detection signal, second reset detection signal, 3rd reset detection signal or magnitude of voltage corresponding to the 4th reset detection signal export reseting controling signal lower than during the reference voltage preset to described system MCU, reset with control system.
Technical solutions of the utility model detect supply voltage by detection of power loss module and export the first reset detection signal, Systematical control detection module detected electrons equipment system MCU input system control signal and export the second reset detection signal, voltage detection module detects the detection voltage of external unit input and exports the 3rd reset detection signal, peripheral hardware controls detection module and detects the hardware control signal of external unit input and export the 4th reset detection signal, reset control module is at described first reset detection signal, second reset detection signal, 3rd reset detection signal or magnitude of voltage corresponding to the 4th reset detection signal export reseting controling signal lower than during the reference voltage preset to described system MCU.Thus reset circuit of the present utility model can not only carry out detection of power loss, electrification reset and system reset, the detection voltage of the external unit input that can also detect according to voltage detection module or the peripheral hardware of external unit input control the hardware control signal that detection module detects, carry out reset to electronic equipment to control, thus not only realize the reset itself controlling functions of the machine, also achieve external unit to control the reset of the machine, the reset therefore realized between the machine and external unit controls mutual.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the utility model reset circuit one embodiment;
Fig. 2 is the theory diagram of another embodiment of the utility model reset circuit;
Fig. 3 is the electrical block diagram of the utility model reset circuit one embodiment.
The realization of the purpose of this utility model, functional characteristics and advantage, will in conjunction with the embodiments, and be described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
The utility model provides a kind of reset circuit, and this reset circuit can be applicable to the electronic equipment with reset function, as televisor.
With reference to the theory diagram that Fig. 1, Fig. 1 are the utility model reset circuit one embodiment.
In the utility model embodiment, as shown in Figure 1, reset circuit of the present utility model comprises detection of power loss module 10, Systematical control detection module 20, voltage detection module 30, peripheral hardware control detection module 40 and reset control module 50.Wherein, described detection of power loss module 10, Systematical control detection module 20, voltage detection module 30, peripheral hardware control detection module 40 and are connected with described reset control module 50 respectively.Particularly, the input end of described detection of power loss module 10 is connected to working power, the input end of described Systematical control detection module 20 is connected to the control signal output terminal of system MCU, the input end of described voltage detection module 30 is connected to external unit (as PC), the input end that described peripheral hardware controls detection module 40 is connected to external unit (as PC), the output terminal of described detection of power loss module 10, the output terminal of Systematical control detection module 20, the output terminal of voltage detection module 30, the output terminal that peripheral hardware controls detection module 40 is all connected with the input end of described reset control module 50, the output terminal of described reset control module 50 is connected to the reset detection end of system MCU.
The supply voltage that described detection of power loss module 10 testing power supply provides also exports the first reset detection signal to described reset control module 50, the system control signal that described Systematical control detection module 20 detection system MCU inputs also exports the second reset detection signal to described reset control module 50, described voltage detection module 30 detects the detection voltage of external unit input and exports the 3rd reset detection signal to described reset control module 50, described peripheral hardware controls detection module 40 and detects the hardware control signal of external unit input and export the 4th reset detection signal to described reset control module 50, described reset control module 50 is at described first reset detection signal, second reset detection signal, 3rd reset detection signal or magnitude of voltage corresponding to the 4th reset detection signal export reseting controling signal lower than during the reference voltage preset to described system MCU, reset with control system, namely control electronic equipment to reset.
When the utility model reset circuit take reseting controling signal as low level signal, system MCU is identified as reset signal, and carries out reset to electronic equipment and control to be described for example.
In the present embodiment, the supply voltage that detection of power loss module 10 testing power supply provides, when powering at the beginning, detection of power loss module 10 detects low level signal, now, the first reset detection signal that detection of power loss module 10 exports is low level signal, reset control module 50 detects that magnitude of voltage that the first reset detection signal is corresponding is lower than the reference voltage preset, the reseting controling signal that reset control module 50 exports is low level signal, thus system MCU is when low level reseting controling signal being detected, system is resetted; After stablizing when powering on, detection of power loss module 10 detects high level signal, now, the first reset detection signal that detection of power loss module 10 exports is high level signal, reset control module 50 detects that magnitude of voltage that the first reset detection signal is corresponding is higher than the reference voltage preset, the reseting controling signal that reset control module 50 exports is high level signal, thus when system MCU detects the reseting controling signal of high level, control system stable operation.In system operation, when detection of power loss module 10 detects that the supply voltage that working power inputs is low level signal, from the above, now system MCU detects low level reseting controling signal, then system MCU can detect and system be in power-down state (such as working power is no longer powered, or supply voltage is lower than the situation of preset value), thus known system resets, if system MCU detects low level reseting controling signal always, then control system is out of service.
When voltage detection module 30 is connected to external unit, voltage detection module 30 detects the detection voltage of external unit input, when detection voltage is low level signal, the second reset detection signal that voltage detection module 30 exports is low level signal, reset control module 50 detects that magnitude of voltage that the second reset detection signal is corresponding is lower than the reference voltage preset, the reseting controling signal that reset control module 50 exports is low level signal, thus system MCU is when low level reseting controling signal being detected, system is resetted.Thus in system operation, when voltage detection module 30 has detected that external unit input detects voltage always for low level signal, system will reset, and be in run-stopping status always; If it is high level signal that voltage detection module 30 has detected that external unit input detects voltage, then the normal operation of not influential system.
In system standby process, when Systematical control detection module 20 detects system MCU input system control signal, and during system control signal during low level signal, the 3rd reset detection signal that Systematical control detection module 20 exports reset control module 50 to is low level signal, thus the reseting controling signal that reset control module 50 exports system MCU to is low level signal, make system reset, thus electronic equipment enters normal operating condition by standby.On the contrary, when Systematical control detection module 20 detects the system control signal high level signal that system MCU inputs, electronic equipment still will be in holding state.
In system standby process, external unit input hardware control signal has been detected when peripheral hardware controls detection module 40, and this hardware control signal is when being low level signal, peripheral hardware controls detection module 40 and will first export of short duration low level signal, export high level signal again, namely the 4th reset detection signal that peripheral hardware control detection module 40 exports becomes high level signal from low level signal, thus when the 4th reset detection signal is low level signal, the reseting controling signal that reset control module 50 exports system MCU to is low level signal, make system reset, and after the 4th reset detection signal becomes high level signal, system enters normal operating condition.
From the above, relative to prior art, reset circuit of the present utility model can not only carry out detection of power loss, electrification reset and system reset, the detection voltage of the external unit input that can also detect according to voltage detection module 30 or the peripheral hardware of external unit input control the hardware control signal that detection module 40 detects, carry out reset to electronic equipment to control, thus not only realize the reset itself controlling functions of the machine, also achieve external unit to control the reset of the machine, the reset therefore realized between the machine and external unit controls mutual.
Refer again to Fig. 2, Fig. 2 is the theory diagram of another embodiment of the utility model reset circuit.
Further, be different from the reset circuit shown in Fig. 1, as shown in Figure 2, reset circuit of the present utility model also comprises peripheral hardware and controls output module 60, and peripheral hardware controls output module 60 for exporting peripheral hardware reseting controling signal according to described first reset detection signal or the 3rd reset detection signal; The input end that described peripheral hardware controls output module 60 is connected with the output terminal of described detection of power loss module 10, and the output terminal that described peripheral hardware controls output module 60 is connected with the input end of described reset control module 50.
Reset circuit of the present utility model controls by peripheral hardware the first reset detection signal that output module 60 detects detection of power loss module 10 output, and when the first reset detection signal is low level signal, peripheral hardware controls output module 60 and exports high level signal; When the first reset detection signal is high level signal, peripheral hardware controls output module 60 output low level signal.Thus reset circuit of the present utility model controls output module 60 by peripheral hardware is connected to external unit (as mobile phone), peripheral hardware is controlled low level signal that output module 60 exports as reset signal, control external unit and reset.
Thus the utility model not only realizes the machine reset itself and controls, but also realizes external unit and control the reset of the machine, also realizes the machine and controls the reset of external unit simultaneously.
Refer again to Fig. 3, Fig. 3 is the electrical block diagram of the utility model reset circuit one embodiment.
As shown in Figure 3, described detection of power loss module 10 comprises the first voltage input end VCC1, the first triode Q1, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3 and the first diode D01.In the present embodiment, the first triode Q1 is PNP triode, and the first voltage input end VCC1, for connecting working power, accesses supply voltage.
Described first voltage input end VCC1 successively via described first resistance R1, the second resistance R2 ground connection, and successively via described first resistance R1, the 3rd resistance R3, the 4th resistance R4 ground connection; The emitter of described first triode Q1 is connected with the common port of described first resistance R1 and described second resistance R2, and is connected with the common port of described first resistance R1 and described 3rd resistance R3; The base stage of described first triode Q1 is connected with the common port of described 3rd resistance R3 and described 4th resistance R4, and the collector of described first triode Q1 is via described 5th resistance R5 ground connection; Described 3rd electric capacity C3 is in parallel with described 5th resistance R5.
Described first electric capacity C1 is in parallel with described 3rd resistance R3, and described second electric capacity C2 is in parallel with described first electric capacity C1; The negative electrode of described first diode D01 is connected with the collector of described first triode Q1, and the anode of described first diode D01 is connected with the input end of described reset control module 50.
Particularly, described Systematical control detection module 20 comprises the second voltage input end STB_VCC1, system control signal input end STB_RST, the second triode Q2, the 3rd triode Q3, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9 and the tenth resistance R10.In the present embodiment, the second triode Q2 is NPN triode, and the 3rd triode Q3 is PNP triode, and the second voltage input end STB_VCC1, for connecting standby power supply (internal battery as electronic equipment), accesses backup power source voltage.
Described system control signal input end STB_RST is connected with the base stage of described second triode Q2 via described 6th resistance R6, and via described 7th resistance R7 ground connection; The grounded emitter of described second triode Q2, the collector of described second triode Q2 is connected with described second voltage input end STB_VCC1 via described 8th resistance R8, and is connected with the base stage of described 3rd triode Q3 via described 9th resistance R9; The emitter of described 3rd triode Q3 is connected with described second voltage input end STB_VCC1, and the collector of described 3rd triode Q3 is connected with the input end of described reset control module 50 via described tenth resistance R10.
Particularly, described reset control module 50 comprises tertiary voltage input end STB_VCC2, three terminal regulator U1, the 11 resistance R11, the 12 resistance R12, the 13 resistance R13, the 14 resistance R14, the 4th electric capacity C4, the 5th electric capacity C5, the 6th electric capacity C6 and reseting controling signal output terminal MAIN_OUT, in the present embodiment, tertiary voltage input end STB_VCC2, for connecting standby power supply, accesses backup power source voltage.
The power pins VDD of described three terminal regulator U1 is connected with the output terminal of described Systematical control detection module 20, and be connected with the output terminal of described detection of power loss module 10 via described 11 resistance R11, and be connected with described tertiary voltage input end STB_VCC2 via described 12 resistance R12; The ground pin GND ground connection of described three terminal regulator U1, the output pin OUT of described three terminal regulator U1 is connected with described tertiary voltage input end STB_VCC2 via described 13 resistance R13, and is connected with reseting controling signal output terminal MAIN_OUT via described 14 resistance R14.
One end of described 4th electric capacity C4 is connected with the power pins VDD of described three terminal regulator U1, the other end ground connection of described 4th electric capacity C4, and described 5th electric capacity C5 is in parallel with described 4th electric capacity C4; One end of described 6th electric capacity C6 is connected with reseting controling signal output terminal MAIN_OUT, the other end ground connection of described 6th electric capacity C6.
Particularly, described voltage detection module 30 comprises N number of voltage detection unit, and N is positive integer, and described voltage detection unit comprises an external voltage input end and one second diode; As in Fig. 3, when N is greater than 1, in voltage detection module 30, have N number of voltage detection unit cascade, thus voltage detection module 30 comprises N number of external voltage input end SUB_IN_1 ~ SUB_IN_N and N number of second diode D11 ~ D1N.The negative electrode of described second diode is connected with described external voltage input end, and the anode of described second diode is connected with the input end of described reset control module 50.Such as, in the first voltage detection unit, the negative electrode of the second diode D11 is connected with described external voltage input end SUB_IN_1, and the anode of described second diode D11 is connected with the input end of described reset control module 50.
In the present embodiment, voltage detection module 30 is by multiple voltage detection unit cascade system, make the utility model reset circuit can be connected to dissimilar external unit, or be connected to multiple external unit simultaneously, thus make the utility model reset circuit detect the detection voltage of multiple external unit input.
Particularly, described peripheral hardware controls detection module 40 and comprises N number of peripheral hardware control detecting unit, and N is positive integer, and described peripheral hardware controls detecting unit and comprises an external control signal input end, a coupling capacitance, a current-limiting resistance and one the 3rd diode; As in Fig. 3, when N is greater than 1, peripheral hardware controls N number of peripheral hardware in detection module 40 and controls detecting unit cascade, thus voltage detection module 30 comprises N number of external control signal input end MAIN_IN_1 ~ MAIN_IN_N, N number of coupling capacitance C11 ~ C1N, N number of current-limiting resistance R21 ~ R2N and N number of second diode D21 ~ D2N.One end of described coupling capacitance is connected with described external control signal input end, the other end of described coupling capacitance is connected via the input end of described current-limiting resistance with described reset control module 50, the negative electrode of described 3rd diode is connected with the common port of described current-limiting resistance and described coupling capacitance, the anode of described 3rd diode is connected with the input end of described reset control module 50, such as, control in detecting unit at the first peripheral hardware, one end of coupling capacitance C11 is connected with external control signal input end MAIN_IN_1, the other end of coupling capacitance C11 is connected with the input end of reset control module 50 via current-limiting resistance R21, the negative electrode of the 3rd diode D21 is connected with the common port of current-limiting resistance R21 and coupling capacitance C11, the anode of the 3rd diode D21 is connected with the input end of reset control module 50.
In like manner, in the present embodiment, peripheral hardware controls detection module 40 and controls detecting unit cascade system by multiple peripheral hardware, make the utility model reset circuit can be connected to dissimilar external unit, or be connected to multiple external unit simultaneously, thus make the utility model reset circuit can by multiple peripheral equipment control.
Particularly, described peripheral hardware control output module 60 comprises the 4th voltage input end VCC2, the 4th triode Q4, the 15 resistance R15, the 16 resistance R16, the 4th diode D02 and peripheral hardware reset control output end RST_OUT.In the present embodiment, the 4th triode Q4 is NPN triode, and the 4th voltage input end VCC2 controls the operating voltage of output module 60 for accessing peripheral hardware, as 3.3V.
The anode of described 4th diode D02 is connected with the output terminal of described detection of power loss module 10, the negative electrode of described 4th diode D02 is connected with the base stage of described 4th triode Q4 via described 15 resistance R15, the grounded emitter of described 4th triode Q4, the collector of described 4th triode Q4 is connected with described peripheral hardware reset control output end RST_OUT, and is connected with described 4th voltage input end VCC2 via described 16 resistance R16.
As shown in Figure 3, the principle of work of the utility model reset circuit specifically describes as follows:
In detection of power loss module 10, when starting to power on, when namely the first voltage input end VCC1 starts to access supply voltage, the first electric capacity C1 and the second electric capacity C2 charges, and when causing powering on, the voltage difference at the 3rd resistance R3 two ends is zero, thus the first triode Q1 not conducting.Now, due to the effect of the 5th resistance R5, make the current collection very low level of the first triode Q1, thus, now the collector output low level signal of the first triode Q1 is to the power pins VDD of three terminal regulator U1 in reset control module 50, and the first reset detection signal that namely now the collector of the first triode Q1 exports is low level signal.Because magnitude of voltage corresponding to low level signal is lower than the portion's reference voltage preset, namely lower than the internal reference voltage of three terminal regulator U1, therefore the output pin OUT output low level signal of three terminal regulator U1, namely now the output pin OUT of three terminal regulator U1 is low level signal to the reseting controling signal that system MCU exports, thus carries out system reset when system MCU detects this low level signal.
The first resistance R1 in detection of power loss module 10, the first electric capacity C1 and the second electric capacity C2 form RC loop, by the parameter adjusting the first resistance R1, the first electric capacity C1 and the second electric capacity C2 can regulate power on time, the time of the collector output low level signal of the first triode Q1.
First voltage input end VCC1 powers on through after a while end, after the supply voltage accessed is stable, first electric capacity C1 and the second electric capacity C2 charges and terminates, first resistance R1, 3rd resistance R3 and the 4th resistance R4 carries out dividing potential drop to supply voltage, the voltage difference at the 3rd resistance R3 two ends drives the first triode Q1 conducting, now the collector of the first triode Q1 exports high level signal, because magnitude of voltage corresponding to this high level signal is higher than the internal reference voltage of three terminal regulator U1, therefore the output pin OUT of three terminal regulator U1 is high level signal to the reseting controling signal that system MCU exports, system no longer resets, enter normal operating conditions.
In system operation, when detection of power loss module 10 detects that the supply voltage that the first voltage input end VCC1 accesses is low level signal, from the above, the collector output low level signal of the first triode Q1, now system MCU detects low level reseting controling signal, then system MCU can detect and system be in power-down state (such as working power is no longer powered, or supply voltage is lower than the situation of preset value), thus known system resets, if system MCU detects low level reseting controling signal always, then control system is out of service.
When voltage detection module 30 is connected to external unit by one or more external voltage input end, when the detection voltage of external unit input is low level signal, second diode current flow that connect corresponding to external voltage input end in voltage detection module 30, the second reset detection signal that now voltage detection module 30 exports is low level signal, three terminal regulator U1 detects that magnitude of voltage that the second reset detection signal is corresponding is lower than its internal reference voltage, the reseting controling signal of three terminal regulator U1 output low level, thus system MCU is when low level reseting controling signal being detected, system is resetted.Thus in system operation, when there being the detectable voltage signals of external unit input low level always, system will reset, and be in run-stopping status always; If when having the detectable voltage signals of external unit input high level always, then the second diode not conducting that connect corresponding to external voltage input end in voltage detection module 30, thus the normal operation of not influential system.
In system standby process, when system MCU is to the system control signal input end STB_RST input system control signal in Systematical control detection module 20, and during this system control signal during low level signal, the base stage input low level signal of the second triode Q2, thus the second triode Q2 ends, now the base stage of the 3rd triode Q3 obtains bias voltage by the 9th resistance R9 and the 8th resistance R8, and the 3rd triode Q3 also ends.Now due to the effect of the tenth resistance R10, the 11 resistance R11 and the 5th resistance R5, make the collector output low level signal of the 3rd triode Q3, namely the collector of the 3rd triode Q3 exports the 3rd reset detection signal of the power pins VDD of three terminal regulator U1 to is low level signal, thus the reseting controling signal of the output low level of three terminal regulator U1 is to system MCU, reset with control system.On the contrary, when the system control signal high level signal that system MCU inputs to the system control signal input end STB_RST in Systematical control detection module 20, electronic equipment still will be in holding state.
In system standby process, when peripheral hardware control detection module 40 is connected to external unit by one or more external control signal input end, when the hardware control signal having external unit to be input to external control signal input end is low level signal, due to the coupling of the coupling capacitance that connect corresponding to external control signal input end, make three diode current flow that connect corresponding to external control signal input end, now peripheral hardware controls the power pins VDD of detection module 40 output low level signal to three terminal regulator U1, thus now the reseting controling signal of the output low level of three terminal regulator U1 to system MCU, make system reset.When the voltage at coupling capacitance two ends is greater than the forward voltage of the 3rd corresponding diode, 3rd triode Q3 ends, the 4th reset detection signal that now peripheral hardware control detection module 40 exports the power pins VDD of three terminal regulator U1 to becomes high level signal, now the reseting controling signal of the output high level of three terminal regulator U1 is to system MCU, and control system enters normal operating conditions by standby.Thus under ideal case, when the hardware control signal having external unit to be input to external control signal input end is low level signal, electronic equipment carries out of short duration reset and enters normal operating condition.
When peripheral hardware control output module 60 is connected to external unit (as mobile phone) by peripheral hardware reset control output end RST_OUT, the the first reset detection signal exported when the collector of the first triode Q1 is low level signal, during the first diode D01 conducting, now due to the cascade connection of the 4th diode D02 and the first diode D01,4th triode Q4 also conducting, the base stage of the 4th triode Q4 is made to be low level, the 4th triode Q4 not conducting.Due to the effect of the 16 resistance R16, make the current collection very high level of the 4th triode Q4, thus now peripheral hardware reset control output end RST_OUT exports high level signal.The the first reset detection signal exported when the collector of the first triode Q1 in detection of power loss module 10 is high level signal, namely when system electrification stablizes rear or not power down, the base stage of the 4th triode Q4 is high level, 4th triode Q4 conducting, thus now peripheral hardware reset control output end RST_OUT output low level signal, the external unit that this low level signal controls to be attached thereto as reset signal can reset by the utility model reset circuit, realizes the machine and controls the reset of external unit.
The utility model also proposes a kind of electronic equipment, this electronic equipment comprises system MCU and reset circuit, reset circuit system MCU be connected, the concrete structure of this reset circuit is with reference to above-described embodiment, because the utility model electronic equipment have employed whole technical schemes of above-mentioned all embodiments, therefore all beneficial effects that the technical scheme having above-described embodiment is equally brought, this is no longer going to repeat them.
Should be noted that; the technical scheme of each embodiment of the present utility model can be combined with each other; but must be can be embodied as basis with those skilled in the art; when technical scheme combination occur conflicting maybe cannot realize time will be understood that the combination of this technical scheme does not exist, also not the utility model require protection domain within.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model instructions and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (10)
1. a reset circuit, is characterized in that, comprises detection of power loss module, Systematical control detection module, voltage detection module, peripheral hardware control detection module and reset control module; Wherein, described detection of power loss module, Systematical control detection module, voltage detection module, peripheral hardware control detection module and are connected with described reset control module respectively;
The supply voltage that described detection of power loss module testing power supply provides also exports the first reset detection signal to described reset control module, the system control signal that described Systematical control detection module detection system MCU inputs also exports the second reset detection signal to described reset control module, described voltage detection module detects the detection voltage of external unit input and exports the 3rd reset detection signal to described reset control module, described peripheral hardware controls detection module and detects the hardware control signal of external unit input and export the 4th reset detection signal to described reset control module, described reset control module is at described first reset detection signal, second reset detection signal, 3rd reset detection signal or magnitude of voltage corresponding to the 4th reset detection signal export reseting controling signal lower than during the reference voltage preset to described system MCU, reset with control system.
2. reset circuit as claimed in claim 1, it is characterized in that, described detection of power loss module comprises the first voltage input end, the first triode, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity and the first diode;
Described first voltage input end successively via described first resistance, the second resistance eutral grounding, and successively via described first resistance, the 3rd resistance, the 4th resistance eutral grounding; The emitter of described first triode is connected with the common port of described first resistance and described second resistance, and is connected with the common port of described first resistance and described 3rd resistance; The base stage of described first triode is connected with the common port of described 3rd resistance and described 4th resistance, and the collector of described first triode is via described 5th resistance eutral grounding; Described 3rd electric capacity and described 5th resistor coupled in parallel;
Described first electric capacity and described 3rd resistor coupled in parallel, described second electric capacity and described first Capacitance parallel connection; The negative electrode of described first diode is connected with the collector of described first triode, and the anode of described first diode is connected with the input end of described reset control module.
3. reset circuit as claimed in claim 1, it is characterized in that, described Systematical control detection module comprises the second voltage input end, system control signal input end, the second triode, the 3rd triode, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance and the tenth resistance;
Described system control signal input end is connected with the base stage of described second triode via described 6th resistance, and via described 7th resistance eutral grounding; The grounded emitter of described second triode, the collector of described second triode is connected with described second voltage input end via described 8th resistance, and is connected via the base stage of described 9th resistance with described 3rd triode; The emitter of described 3rd triode is connected with described second voltage input end, and the collector of described 3rd triode is connected with the input end of described reset control module via described tenth resistance.
4. reset circuit as claimed in claim 1, it is characterized in that, described reset control module comprises tertiary voltage input end, three terminal regulator, the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance and reseting controling signal output terminal;
The power pins of described three terminal regulator is connected with the output terminal of described Systematical control detection module, and is connected with the output terminal of described detection of power loss module via described 11 resistance, and is connected with described tertiary voltage input end via described 12 resistance; The ground pin ground connection of described three terminal regulator, the output pin of described three terminal regulator is connected with described tertiary voltage input end via described 13 resistance, and is connected with reseting controling signal output terminal via described 14 resistance.
5. reset circuit as claimed in claim 4, it is characterized in that, described reset control module also comprises the 4th electric capacity, the 5th electric capacity and the 6th electric capacity; One end of described 4th electric capacity is connected with the power pins of described three terminal regulator, the other end ground connection of described 4th electric capacity, described 5th electric capacity and described 4th Capacitance parallel connection; One end of described 6th electric capacity is connected with reseting controling signal output terminal, the other end ground connection of described 6th electric capacity.
6. reset circuit as claimed in claim 1, it is characterized in that, described voltage detection module comprises at least one voltage detection unit, and described voltage detection unit comprises an external voltage input end and one second diode; The negative electrode of described second diode is connected with described external voltage input end, and the anode of described second diode is connected with the input end of described reset control module.
7. reset circuit as claimed in claim 1, it is characterized in that, described peripheral hardware controls detection module and comprises at least one peripheral hardware control detecting unit, and described peripheral hardware controls detecting unit and comprises an external control signal input end, a coupling capacitance, a current-limiting resistance and one the 3rd diode; One end of described coupling capacitance is connected with described external control signal input end, the other end of described coupling capacitance is connected via the input end of described current-limiting resistance with described reset control module, the negative electrode of described 3rd diode is connected with the common port of described current-limiting resistance and described coupling capacitance, and the anode of described 3rd diode is connected with the input end of described reset control module.
8. reset circuit as claimed in any of claims 1 to 7 in one of claims, is characterized in that, the peripheral hardware also comprised for exporting peripheral hardware reseting controling signal according to described first reset detection signal or the 3rd reset detection signal controls output module; The input end that described peripheral hardware controls output module is connected with the output terminal of described detection of power loss module, and the output terminal that described peripheral hardware controls output module is connected with the input end of described reset control module.
9. reset circuit as claimed in claim 8, is characterized in that, described peripheral hardware controls output module and comprises the 4th voltage input end, the 4th triode, the 15 resistance, the 16 resistance, the 4th diode and peripheral hardware reset control output end;
The anode of described 4th diode is connected with the output terminal of described detection of power loss module, the negative electrode of described 4th diode is connected via the base stage of described 15 resistance with described 4th triode, the grounded emitter of described 4th triode, the collector of described 4th triode is connected with described peripheral hardware reset control output end, and is connected with described 4th voltage input end via described 16 resistance.
10. an electronic equipment, comprises system MCU, it is characterized in that, also comprises reset circuit as in one of claimed in any of claims 1 to 9, and described reset circuit is connected with described system MCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520998509.XU CN205229962U (en) | 2015-12-04 | 2015-12-04 | Reset circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520998509.XU CN205229962U (en) | 2015-12-04 | 2015-12-04 | Reset circuit and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN205229962U true CN205229962U (en) | 2016-05-11 |
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| CN201520998509.XU Expired - Fee Related CN205229962U (en) | 2015-12-04 | 2015-12-04 | Reset circuit and electronic equipment |
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| CN (1) | CN205229962U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107341075A (en) * | 2017-08-28 | 2017-11-10 | 北京融通高科微电子科技有限公司 | Power-down protection apparatus and electronic equipment |
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2015
- 2015-12-04 CN CN201520998509.XU patent/CN205229962U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107341075A (en) * | 2017-08-28 | 2017-11-10 | 北京融通高科微电子科技有限公司 | Power-down protection apparatus and electronic equipment |
| CN107341075B (en) * | 2017-08-28 | 2023-12-15 | 北京世通凌讯科技有限公司 | Power-down protection device and electronic equipment |
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Granted publication date: 20160511 Termination date: 20171204 |