CN205353647U - Low -power consumption button awakening circuit - Google Patents

Low -power consumption button awakening circuit Download PDF

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Publication number
CN205353647U
CN205353647U CN201620146804.7U CN201620146804U CN205353647U CN 205353647 U CN205353647 U CN 205353647U CN 201620146804 U CN201620146804 U CN 201620146804U CN 205353647 U CN205353647 U CN 205353647U
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China
Prior art keywords
circuit
voltage
key
stabilizing
low
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CN201620146804.7U
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Inventor
陈少彬
许良刚
林冬武
洪志毅
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ZHANGZHOU CANNET ELECTRICAL APPLIANCE CO Ltd
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ZHANGZHOU CANNET ELECTRICAL APPLIANCE CO Ltd
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Abstract

The utility model discloses a low -power consumption button awakening circuit, it includes a voltage stabilizing circuit and button control circuit, and voltage stabilizing circuit includes a steady voltage device, and the messenger that the steady voltage device has an input, output and this steady voltage device of messenger's ability can hold, and the external power supply end concatenates the input of battery supply end and steady voltage device in proper order, and the messenger that this steady voltage device is connected respectively to a IO control end of external power supply end, MCU controller and button control circuit's output can hold, button control circuit is equipped with a button, can control the level fluctuation of this button control circuit's output through operating this button to the messenger who controls this steady voltage device can hold, the MCU controller can be controlled its IO control end and take place level fluctuation behind the setting -up time after the outage of external power supply end to the messenger who controls this steady voltage device can hold. It has following advantage: save energy, the extension battery supply life -span, simple structure, the device of adoption is few, and is with low costs.

Description

A kind of low-power consumption key wakeup circuit
Technical field
This utility model relates to a kind of circuit structure, particularly relates to a kind of low-power consumption key wakeup circuit.
Background technology
Intelligence system with MCU controller is generally configured with two kinds of power supplies, and one is that external power supply is powered, and one is that battery supply is powered;After external power supply has a power failure, owing to needs preserve data, MCU controller need nonetheless remain for battery supply and powers, after data have preserved, intelligence system initially enters holding state, time standby, battery supply is still within power supply state, although be in low power consumpting state time standby inside intelligence system, but operating current is still bigger, always all at the electricity consuming battery supply, causing that battery supply is not durable, the life-span is short.For the foregoing reasons, if after MCU controller has preserved data, by complete for power supply drop (battery supply power-off), so will not consume any electricity in intelligence system stand-by time after having preserved data, electricity consumption can be saved, extend the life-span of battery supply, in time needing the work recovering intelligence system, by a wake-up circuit MCU controller of this intelligence system waken up and restart, the wake-up circuit general circuit structure of prior art is complicated, adopting more logic chip, therefore circuit cost is also higher.
Utility model content
This utility model provides a kind of low-power consumption key wakeup circuit, which overcomes the deficiencies in the prior art described in background technology.
This utility model solves its technical problem and be the technical scheme is that
A kind of low-power consumption key wakeup circuit, it includes a mu balanced circuit and key control circuit, this mu balanced circuit includes a voltage-stabilizing device, this voltage-stabilizing device has the Enable Pin of an input, outfan and this voltage-stabilizing device of enable, external power supply end is sequentially connected in series the input of battery supply end and this voltage-stabilizing device, and external power supply end, an I/O control end of MCU controller and the outfan of key control circuit connect the Enable Pin of this voltage-stabilizing device respectively;This key control circuit is provided with a button, is operated by the level change that this button can control the outfan of this key control circuit, to control the Enable Pin of this voltage-stabilizing device;This MCU controller can control, after its I/O controls the end setting time after external power end power-off, level change occurs, to control the Enable Pin of this voltage-stabilizing device.
Among one embodiment: described key control circuit includes key circuit and transistor switching circuit, this transistor switching circuit includes a PNP triode, the base stage of this PNP triode connects the outfan of key circuit, the outfan of the key control circuit that the current collection of this PNP triode is extremely described by a resistance element ground connection, the emitter stage connection battery supply end of this PNP triode.
Among one embodiment: described key circuit includes described button, one end ground connection of button, the other end is the outfan of described key circuit.
Among one embodiment: described voltage-stabilizing device is low pressure difference linear voltage regulator.
Among one embodiment: described resistance element is resistive element.
Among one embodiment: be serially connected with the first diode between described external power supply end and battery supply end, the positive terminal of the first diode connects external power supply end, and negative pole end connects battery supply end.
Among one embodiment: three control loops of the Enable Pin formation that described external power supply end, the I/O control end of MCU controller and the outfan of key control circuit connect this voltage-stabilizing device respectively have a common electrical contact, described external power supply end concatenates one second diode between this common electrical contact, the positive terminal of this second diode connects this external power supply end, and negative pole end connects this common electrical contact.
Among one embodiment: the I/O of described MCU controller controls end and concatenates one the 3rd diode between this common electrical contact, the positive terminal of the 3rd diode connects this I/O and controls end, and negative pole end connects this common electrical contact.
The technical program is compared with background technology, and it has the advantage that
1, external power supply end, an I/O control end of MCU controller and the outfan of key control circuit connect the Enable Pin of this voltage-stabilizing device respectively, MCU controller can control, after its I/O controls the end setting time after external power end power-off, level change occurs, to control the Enable Pin of this voltage-stabilizing device;After external power outage, the outfan of external power supply end and key control circuit all cannot enable voltage-stabilizing device, the I/O that MCU controls controls end and still enables voltage-stabilizing device, therefore voltage-stabilizing device normal operation, within the described setting time, powered by battery supply, MCU controller preserves data, after the setting time, MCU controller controls its I/O control end generation level upset and turns off the Enable Pin of voltage-stabilizing device, the power supply (i.e. battery supply) of thorough drop MCU controller, MCU controller is made not consume the electricity of battery supply when holding state, save energy, extend the life-span of battery supply.
2, when needs restart MCU controller, it is operated by the button of described key control circuit, the outfan generation level making key control circuit overturns, thus enabling voltage-stabilizing device, battery supply recovers to the power supply of MCU controller, this key control circuit simple in construction, the device of employing is few, and cost is low.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail.
Fig. 1 depicts the circuit theory diagrams of a kind of low-power consumption key wakeup circuit described in the present embodiment.
Detailed description of the invention
Refer to Fig. 1, a kind of low-power consumption key wakeup circuit, it includes a mu balanced circuit and key control circuit, and this mu balanced circuit includes a voltage-stabilizing device LDO, and the voltage-stabilizing device described in the present embodiment is low pressure difference linear voltage regulator (LDO).This voltage-stabilizing device LDO has an input Vin, output end vo ut and enables the Enable Pin EN of this voltage-stabilizing device, external power supply end VCC connects the input Vin of this voltage-stabilizing device LDO again after connecting battery supply end BAT, one I/O control end POWON of external power supply end VCC, MCU controller and the outfan SWPOWER of key control circuit connects the Enable Pin of this voltage-stabilizing device LDO respectively, and the outfan of this voltage-stabilizing device LDO can be used for connecting MCU controller and providing electric energy for MCU controller;This key control circuit is provided with a button S1, is operated by this button S1 and can control the outfan level change of this key control circuit, to control the Enable Pin EN of this voltage-stabilizing device LDO;This MCU controller can control, after its I/O controls the end setting time after external power end VCC power-off, level change occurs, to control the Enable Pin EN of this voltage-stabilizing device LDO.
In the present embodiment, described key control circuit includes key circuit and transistor switching circuit, and this key circuit includes one end ground connection of described button S1, button S1, and the other end is the outfan SWPOWER of key circuit;This transistor switching circuit includes a PNP triode Q1, the base stage of this PNP triode Q1 connects the outfan SWPOWER of key circuit, the outfan of the key control circuit that the current collection of this PNP triode Q1 is extremely described by a resistance element R6 ground connection, the emitter stage connection battery supply end BAT of this PNP triode Q1.
In the present embodiment, the positive terminal of described external power supply end VCC connects voltage-stabilizing device LDO again input Vin, the first diode D1 after connecting battery supply end BAT by the first diode D1 connects external power supply end VCC, and negative pole end connects battery supply end BAT.Three control loops of the Enable Pin EN formation that the I/O control end POWON of described external power supply end VCC, MCU controller and the outfan of key control circuit connect this voltage-stabilizing device LDO respectively have a common electrical contact A, one second diode D2 is concatenated between described external power supply end VCC to this common electrical contact A, the positive terminal of this second diode D2 connects this external power supply end VCC, and negative pole end connects this common electrical contact A.The I/O of described MCU controller controls concatenation one the 3rd diode D3 between end POWON to this common electrical contact A, and the positive terminal of the 3rd diode D3 connects this I/O and controls end POWON, and negative pole end connects this common electrical contact A.
The operation principle of low-power consumption wake-up circuit described in the utility model is as follows: when there being external power supply to power, and voltage-stabilizing device LDO enables normal operation, the output end vo ut output voltage VDD of voltage-stabilizing device LDO by dispatch from foreign news agency power end through the second diode D2.Now, its I/O is controlled end POWON and draws high by MCU controller, enables voltage-stabilizing device LDO simultaneously.
After external power supply power down, second diode D2 front voltage is ' 0 ', do not enable voltage-stabilizing device LDO, but owing to now battery supply is still in power supply, it is still high that the I/O of MCU controller controls end POWON, remain able to enable voltage-stabilizing device LDO work and continue as MCU controller and power, after MCU controller has preserved data within the time set, I/O is just controlled end POWON and drags down by MCU controller, and voltage-stabilizing device LDO does not work, the thorough power-off of MCU controller, waits that key wakeup starts.
When needing to wake up MCU controller, only need to push button S1, and PNP triode enters saturation, and emitter and collector turns on, and the enable foot of voltage-stabilizing device LDO transfers high level to, and MCU controller is again powered by battery supply and waken up, enters normal operating conditions.
It is lower to data preservation that low-power consumption wake-up circuit described in the utility model can make MCU controller power at battery supply after external power supply power-fail, data have after preserving can thorough all power supplies of drop (including battery supply), MUC controller does not consume the electricity of battery supply when entering holding state, save energy, extend the life-span of battery supply.When needs restart MCU controller, it is operated by the button of described key control circuit, makes the outfan generation level of key control circuit overturn, thus enabling voltage-stabilizing device, battery supply recovers to the power supply of MCU controller, this key control circuit simple in construction, the device adopted is few, and cost is low.
The above, be only this utility model preferred embodiment, therefore can not limit the scope that this utility model is implemented according to this, and the equivalence namely made according to this utility model the scope of the claims and description changes and modifies, and all should still belong in the scope that this utility model is contained.

Claims (8)

1. a low-power consumption key wakeup circuit, it is characterized in that: include a mu balanced circuit and key control circuit, this mu balanced circuit includes a voltage-stabilizing device, this voltage-stabilizing device has the Enable Pin of an input, outfan and this voltage-stabilizing device of enable, external power supply end is sequentially connected in series the input of battery supply end and voltage-stabilizing device, and external power supply end, an I/O control end of MCU controller and the outfan of key control circuit connect the Enable Pin of this voltage-stabilizing device respectively;This key control circuit is provided with a button, is operated by the level change that this button can control the outfan of this key control circuit, to control the Enable Pin of this voltage-stabilizing device;This MCU controller can control, after its I/O controls the end setting time after external power end power-off, level change occurs, to control the Enable Pin of this voltage-stabilizing device.
2. a kind of low-power consumption key wakeup circuit according to claim 1, it is characterized in that: described key control circuit includes key circuit and transistor switching circuit, this transistor switching circuit includes a PNP triode, the base stage of this PNP triode connects the outfan of key circuit, the outfan of the key control circuit that the current collection of this PNP triode is extremely described by a resistance element ground connection, the emitter stage connection battery supply end of this PNP triode.
3. a kind of low-power consumption key wakeup circuit according to claim 2, it is characterised in that: described key circuit includes described button, one end ground connection of button, and the other end is the outfan of described key circuit.
4. a kind of low-power consumption key wakeup circuit according to claim 1 or 2 or 3, it is characterised in that: described voltage-stabilizing device is low pressure difference linear voltage regulator.
5. a kind of low-power consumption key wakeup circuit according to claim 2, it is characterised in that: described resistance element is resistive element.
6. a kind of low-power consumption key wakeup circuit according to claim 1, it is characterised in that: being serially connected with the first diode between described external power supply end and battery supply end, the positive terminal of the first diode connects external power supply end, and negative pole end connects battery supply end.
7. a kind of low-power consumption key wakeup circuit according to claim 1, it is characterized in that: three control loops of the Enable Pin formation that described external power supply end, the I/O control end of MCU controller and the outfan of key control circuit connect this voltage-stabilizing device respectively have a common electrical contact, described external power supply end concatenates one second diode between this common electrical contact, the positive terminal of this second diode connects this external power supply end, and negative pole end connects this common electrical contact.
8. a kind of low-power consumption key wakeup circuit according to claim 7, it is characterized in that: the I/O of described MCU controller controls end and concatenates one the 3rd diode between this common electrical contact, the positive terminal of the 3rd diode connects this I/O and controls end, and negative pole end connects this common electrical contact.
CN201620146804.7U 2016-02-26 2016-02-26 Low -power consumption button awakening circuit Active CN205353647U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201620146804.7U CN205353647U (en) 2016-02-26 2016-02-26 Low -power consumption button awakening circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201620146804.7U CN205353647U (en) 2016-02-26 2016-02-26 Low -power consumption button awakening circuit

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CN205353647U true CN205353647U (en) 2016-06-29

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106774604A (en) * 2017-02-28 2017-05-31 湖南威胜信息技术有限公司 Key wakeup circuit, awakening method and its meter reading terminal being made
CN108968826A (en) * 2018-08-22 2018-12-11 深圳市云鼠科技开发有限公司 A kind of small-power constant-current circuit applied to sweeping robot control circuit board

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106774604A (en) * 2017-02-28 2017-05-31 湖南威胜信息技术有限公司 Key wakeup circuit, awakening method and its meter reading terminal being made
CN108968826A (en) * 2018-08-22 2018-12-11 深圳市云鼠科技开发有限公司 A kind of small-power constant-current circuit applied to sweeping robot control circuit board

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