CN204790414U - Singlechip starting circuit - Google Patents
Singlechip starting circuit Download PDFInfo
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- CN204790414U CN204790414U CN201520389211.9U CN201520389211U CN204790414U CN 204790414 U CN204790414 U CN 204790414U CN 201520389211 U CN201520389211 U CN 201520389211U CN 204790414 U CN204790414 U CN 204790414U
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Abstract
The utility model discloses a singlechip starting circuit, including anticoincidence gate (XOR) and first triode (Q1), power supply (VCC1) is connected through first resistance (R1) and second resistance (R2) respectively to two inputs of anticoincidence gate (XOR), the first input end of anticoincidence gate (XOR) passes through starting switch (S1) ground connection (GND), the output of anticoincidence gate (XOR) passes through third resistance (R3) and connects the grid of first triode (Q1), the grid of first triode (Q1) passes through fourth resistance (R4) and connects power supply (VCC1), the source connection of first triode (Q1) power supply (VCC1), the power foot (VCC2) of singlechip (MCU) is connected in the drain electrode of first triode (Q1). The utility model has the advantages of circuit structure is simple, reduction manufacturing cost, and system's stand -by power consumption is low.
Description
Technical field
The utility model relates to a kind of single-chip microcomputer start-up circuit.
Background technology
At present, the handheld devices such as most mobile phone, panel computer, POS terminal are all configured with single-button electronic switch, and retainer belt electricity condition during shutdown, this just makes stand-by power consumption become the important parameter of handheld device.In prior art, handheld device majority adopts the microprocessor such as single-chip microcomputer, DSP, and when adopting single-chip microcomputer to be microprocessor, its starting switch circuit arrangement mainly contains three kinds: 1, d type flip flop or JK flip-flop are as 74LS109; 2, triode or triode and metal-oxide-semiconductor coordinate circuit; 3, special switch machine managing chip is as LTC2950.In the first scheme there is quiescent dissipation in trigger, is approximately 0.1 ~ 1mA.The second triode ability belongs to current mode switch, and the power consumption of triode is inevitable.The third scheme than the above two good stabilities, stand-by power consumption 6uA, but its chip cost is relatively high.If the arousal function adopting single-chip microcomputer to carry, then need the peripheral circuit more complicated introduced.Therefore, provide that a kind of system standby is low in energy consumption, the simple single-chip microcomputer start-up circuit of low cost of manufacture, circuit structure is the technical matters needing solution in this area badly in the art.
Utility model content
Technical problem to be solved in the utility model is, provide a kind of circuit structure simple, reduce manufacturing cost, the single-chip microcomputer start-up circuit that system standby is low in energy consumption.
In order to solve the problems of the technologies described above, the technical solution of the utility model is: a kind of single-chip microcomputer start-up circuit, comprise XOR gate and the first triode, the first input end of described XOR gate connects power supply by the first resistance, second input end of described XOR gate connects power supply by the second resistance, the first input end of described XOR gate is by starting switch ground connection, the output terminal of described XOR gate connects the grid of described first triode by the 3rd resistance, the grid of described first triode connects described power supply by the 4th resistance, the source electrode of described first triode connects described power supply, the drain electrode of described first triode connects the supply pin of single-chip microcomputer.
Further, the single-chip microcomputer start-up circuit that the utility model provides, also comprise holding circuit, described holding circuit comprises the second triode, one of them I/O mouth of described single-chip microcomputer connects the base stage of described second triode by the 5th resistance, the grounded emitter of described second triode, the collector of described second triode connects the second input end of described XOR gate.
Further, the single-chip microcomputer start-up circuit that the utility model provides, also comprise level sensitive circuit, described level sensitive circuit comprises first diode of Opposite direction connection at the first input end of described XOR gate, described first diode connects the supply pin of described single-chip microcomputer by the 6th resistance, and the common intersection of described first diode and the 6th resistance is level detection point.
Further, the single-chip microcomputer start-up circuit that the utility model provides, described second triode is NPN pipe.
Further, the single-chip microcomputer start-up circuit that the utility model provides, also comprises the first electric capacity being connected in parallel on described starting switch two ends.
Further, the single-chip microcomputer start-up circuit that the utility model provides, the drain electrode of described first triode connects the supply pin of described single-chip microcomputer by three terminal regulator.
Further, the single-chip microcomputer start-up circuit that the utility model provides, described three terminal regulator is low pressure difference linear voltage regulator.
Further, the single-chip microcomputer start-up circuit that the utility model provides, described starting switch is reset switch.
Further, the single-chip microcomputer start-up circuit that the utility model provides, described starting switch is self-lock switch.
Further, the single-chip microcomputer start-up circuit that the utility model provides, described first triode is COMS pipe.
Compared with prior art, the utility model all connects power supply by pull-up resistor due to the first input end of XOR gate and the second input end, therefore, under normality, two input ends of XOR gate are high level, namely when starting switch disconnects, according to the truth table of XOR gate, now, the output terminal of XOR gate exports high level, then the grid of the first triode is high level, because the source electrode of the first triode connects power supply, then the source electrode of the first triode is also high level, then the first triode is in cut-off state, and now, single-chip microcomputer does not start; After connecting starting switch, due to starting switch ground connection, then the first input end of XOR gate transfers low level to by high level, according to the truth table of XOR gate, the output terminal output low level of XOR gate, now, the grid of the first triode is low level, and the source electrode of the first triode is high level, then the first triode becomes conducting state, now, the supply pin of single-chip microcomputer connects power supply, then single-chip microcomputer starts.
Single-chip microcomputer start-up circuit of the present utility model is made up of an XOR gate, triode, a switch and four resistance, therefore has that circuit structure is simple, the feature of low cost of manufacture.The utility model is due to the triode of voltage mode control, and its quiescent current is 1uA to 10uA, therefore triode is in conducting or cut-off state, and its power consumption is all lower, and particularly when cut-off state, its system standby power consumption is lower.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of embodiment one of the present utility model;
Fig. 2 is the circuit theory diagrams of embodiment two of the present utility model;
Fig. 3 is the circuit theory diagrams of embodiment three of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail:
Embodiment one
Please refer to Fig. 1, the single-chip microcomputer start-up circuit that the present embodiment one provides, comprise XOR gate XOR and the first triode Q1, described first triode Q1 is COMS pipe, the first input end of described XOR gate XOR connects power supply VCC1 by the first resistance R1, second input end of described XOR gate XOR connects power supply VCC1 by the second resistance R2, the first input end of described XOR gate XOR is by starting switch S1 ground connection GND, the output terminal of described XOR gate XOR connects the grid of described first triode Q1 by the 3rd resistance R3, the grid of described first triode Q1 connects described power supply VCC1 by the 4th resistance R4, the source electrode of described first triode Q1 connects described power supply VCC1, the drain electrode of described first triode Q1 connects the supply pin VCC2 of single-chip microprocessor MCU.
The utility model all meets power supply VCC1 by pull-up resistor (i.e. the first resistance R1 and the second resistance R2) due to the first input end of XOR gate XOR and the second input end, therefore, under normality, two input ends of XOR gate XOR are high level, namely when starting switch S1 disconnects, according to the truth table of XOR gate XOR, now, the output terminal of XOR gate XOR exports high level, then the grid of the first triode Q1 is high level, because the source electrode of the first triode Q1 meets power supply VCC1, then the source electrode of the first triode Q1 is also high level, then the first triode Q1 is in cut-off state, now, single-chip microprocessor MCU does not start, after connecting starting switch S1, due to starting switch S1 ground connection, then the first input end of XOR gate XOR transfers low level to by high level, according to the truth table of XOR gate XOR, the output terminal output low level of XOR gate XOR, now, the grid of the first triode Q1 is low level, and the source electrode of the first triode Q1 is high level, then the first triode Q1 becomes conducting state, now, the supply pin VCC2 of single-chip microprocessor MCU connects power supply VCC1, then single-chip microprocessor MCU starts.
The starting switch S1 of the present embodiment one can be reset switch or self-lock switch.Use the advantage of reset switch to be, the triggering level of the single-chip microcomputer start-up circuit of formation is pulse signal.When pressing reset switch, change the level signal of the first input end of XOR gate, after unclamping starting switch, make the level signal of the first input end of XOR gate recover former level signal.The effect of self-lock switch is, after self-lock switch is pressed, makes the level of the first input end of XOR gate be in low level state always, does not also change the level state of XOR gate first input end after unclamping, and after again pressing self-lock switch, disconnects.The concrete use of starting switch S1, can be arranged according to the circuit requirements of reality.
Embodiment two
Please refer to Fig. 2, the present embodiment two improves to form on the basis of embodiment one, its difference is, the single-chip microcomputer start-up circuit of the present embodiment two, also comprise holding circuit, described holding circuit comprises the second triode Q2, described second triode is NPN pipe, also PNP pipe can be used by the biasing circuit of change second triode, a wherein I/O mouth of described single-chip microprocessor MCU connects the base stage of described second triode Q2 by the 5th resistance R5, the grounded emitter GND of described second triode Q2, the collector of described second triode Q2 connects second input end of described XOR gate XOR.
The advantage of the present embodiment two is, it is in running order that holding circuit can maintain single-chip microcomputer.Its principle of work is as follows: starting switch S1 uses reset switch, and after pressing starting switch S1, the first input end of XOR gate becomes low level state from high level, and after unclamping starting switch S1, the first input end of XOR gate reverts to high level state by low level.After pressing starting switch S1, single-chip microprocessor MCU starts, its I/O mouth exports high level signal and drives the second triode Q2 to become conducting state from cut-off state by the first resistance R5, then the collector of the second triode Q2 is equivalent to ground connection GND is low level signal, then the second input end of XOR gate becomes low level signal from high level, now, because starting switch S2 unclamps, owing to connecting power supply VCC1 by the first resistance R1, therefore, the first input end of XOR gate reverts to high level.Now, two input ends of XOR gate XOR one of them be high level, one is low level, to make XOR gate XOR output low level, is in conducting state, is in starting state to maintain single-chip microprocessor MCU with its first triode Q1.During the utility model use self-lock switch, due to the advantage of self-lock switch, therefore, without the need to this holding circuit.
Embodiment three
Please refer to Fig. 3, the single-chip microcomputer start-up circuit that the present embodiment three provides improves on the basis of embodiment two, also comprise level sensitive circuit, described level sensitive circuit comprises the first diode D1 of Opposite direction connection at the first input end of described XOR gate XOR, described first diode D1 connects the supply pin VCC2 of described single-chip microprocessor MCU by the 6th resistance R6, namely the anode of the first diode D1 meets power supply VCC1, negative electrode termination the 6th resistance R6 of the first diode D1, described in, the common intersection of the first diode D1 and the 6th resistance R6 is level detection point CHECK.
The present embodiment three, when connecting starting switch S1, the cathode terminal of the first diode D1 is low level, the anode tap of the first diode D1 meets power supply VCC1 by the 6th resistance R1, and therefore, the first diode D1 is in conducting state, now, the voltage of level detection point CHECK is low level.When disconnecting starting switch S1, the cathode terminal of the first diode D1 is owing to connecting power supply VCC1 by the first resistance R1, therefore, the cathode terminal of the first diode D1 is high level, and the anode tap of the first diode D1 is also high level, now, the first diode D1 is in cut-off state, now, level detection point CHECK is voltage is high level.
Comparatively preferably embodiment, in the present embodiment three, also comprise the first electric capacity C1 being connected in parallel on described starting switch S1 two ends, because electric capacity has the advantages that to prevent the voltage instantaneous at its two ends from suddenling change, therefore, can prevent the level signal of the first input end of XOR gate XOR from becoming low level instantaneously.
The present embodiment three, after can preventing single-chip microprocessor MCU from starting, two input ends of XOR gate XOR are low level and single-chip microprocessor MCU is quit work simultaneously.
Embodiment four
The single-chip microcomputer start-up circuit that the present embodiment four is to provide, improve to form on the basis of embodiment one to three, its difference is, the drain electrode of described first triode Q1 connects the supply pin VCC2 of described single-chip microprocessor MCU by three terminal regulator such as low pressure difference linear voltage regulator LDO.The advantage of three terminal regulator is adopted to be, according to the demand of the supply voltage of single-chip microcomputer, the three terminal regulator of different voltage stabilizing value can be adjusted, such as, when adopting 3.3V single-chip microcomputer to power, realized the conversion of high-low voltage by low pressure difference linear voltage regulator LDO, think that monolithic sheet provides power supply to supply.
Single-chip microcomputer start-up circuit of the present utility model is made up of an XOR gate, triode, a switch and four resistance, therefore has that circuit structure is simple, the feature of low cost of manufacture.The utility model is due to the triode of voltage mode control, and its quiescent current is 1uA to 10uA, therefore triode is in conducting or cut-off state, and its power consumption is all lower, and particularly when cut-off state, its system standby power consumption is lower.
The utility model is not limited to above-mentioned embodiment, and all various changes done in the spirit and scope of claim of the present utility model, all within protection domain of the present utility model.
Claims (10)
1. a single-chip microcomputer start-up circuit, it is characterized in that, comprise XOR gate (XOR) and the first triode (Q1), the first input end of described XOR gate (XOR) connects power supply (VCC1) by the first resistance (R1), second input end of described XOR gate (XOR) connects power supply (VCC1) by the second resistance (R2), the first input end of described XOR gate (XOR) is by starting switch (S1) ground connection (GND), the output terminal of described XOR gate (XOR) connects the grid of described first triode (Q1) by the 3rd resistance (R3), the grid of described first triode (Q1) connects described power supply (VCC1) by the 4th resistance (R4), the source electrode of described first triode (Q1) connects described power supply (VCC1), the drain electrode of described first triode (Q1) connects the supply pin (VCC2) of single-chip microcomputer (MCU).
2. single-chip microcomputer start-up circuit as claimed in claim 1, it is characterized in that, also comprise holding circuit, described holding circuit comprises the second triode (Q2), one of them I/O mouth of described single-chip microcomputer (MCU) connects the base stage of described second triode (Q2) by the 5th resistance (R5), the grounded emitter (GND) of described second triode (Q2), the collector of described second triode (Q2) connects the second input end of described XOR gate (XOR).
3. single-chip microcomputer start-up circuit as claimed in claim 1 or 2, it is characterized in that, also comprise level sensitive circuit, described level sensitive circuit comprises first diode (D1) of Opposite direction connection at the first input end of described XOR gate (XOR), described first diode (D1) connects the supply pin (VCC2) of described single-chip microcomputer (MCU) by the 6th resistance (R6), and described first diode (D1) is level detection point (CHECK) with the common intersection of the 6th resistance (R6).
4. single-chip microcomputer start-up circuit as claimed in claim 2, is characterized in that, described second triode (Q2) is NPN pipe.
5. single-chip microcomputer start-up circuit as claimed in claim 1, is characterized in that, also comprise the first electric capacity (C1) being connected in parallel on described starting switch (S1) two ends.
6. single-chip microcomputer start-up circuit as claimed in claim 1, it is characterized in that, the drain electrode of described first triode (Q1) connects the supply pin (VCC2) of described single-chip microcomputer (MCU) by three terminal regulator.
7. single-chip microcomputer start-up circuit as claimed in claim 6, it is characterized in that, described three terminal regulator is low pressure difference linear voltage regulator (LDO).
8. single-chip microcomputer start-up circuit as claimed in claim 1, it is characterized in that, described starting switch (S1) is reset switch.
9. single-chip microcomputer start-up circuit as claimed in claim 1, it is characterized in that, described starting switch (S1) is self-lock switch.
10. single-chip microcomputer start-up circuit as claimed in claim 1, is characterized in that, described first triode (Q1) is COMS pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520389211.9U CN204790414U (en) | 2015-06-08 | 2015-06-08 | Singlechip starting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520389211.9U CN204790414U (en) | 2015-06-08 | 2015-06-08 | Singlechip starting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204790414U true CN204790414U (en) | 2015-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520389211.9U Active CN204790414U (en) | 2015-06-08 | 2015-06-08 | Singlechip starting circuit |
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| CN (1) | CN204790414U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112269332A (en) * | 2020-09-29 | 2021-01-26 | 宇龙计算机通信科技(深圳)有限公司 | Microcontroller system circuit and electronic device |
| CN114895593A (en) * | 2022-05-12 | 2022-08-12 | 弘正储能(上海)能源科技有限公司 | Wake-up circuit, embedded single chip microcomputer and control method |
-
2015
- 2015-06-08 CN CN201520389211.9U patent/CN204790414U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112269332A (en) * | 2020-09-29 | 2021-01-26 | 宇龙计算机通信科技(深圳)有限公司 | Microcontroller system circuit and electronic device |
| CN114895593A (en) * | 2022-05-12 | 2022-08-12 | 弘正储能(上海)能源科技有限公司 | Wake-up circuit, embedded single chip microcomputer and control method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |