CN103647534A - Key reset circuit of electronic equipment - Google Patents
Key reset circuit of electronic equipment Download PDFInfo
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- CN103647534A CN103647534A CN201310633443.XA CN201310633443A CN103647534A CN 103647534 A CN103647534 A CN 103647534A CN 201310633443 A CN201310633443 A CN 201310633443A CN 103647534 A CN103647534 A CN 103647534A
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Abstract
The invention discloses a key reset circuit of electronic equipment. The key reset circuit comprises a key and further comprises a time delay circuit, a voltage comparison circuit, a voltage-controlled pulse circuit and a reset signal circuit, wherein the input end of the time delay circuit is electrically connected with a second power supply through the key, the voltage comparison circuit includes a voltage comparator, the output end of the time delay circuit is electrically connected with one input end of the voltage comparator, the other input end of the voltage comparator is electrically connected with a third voltage power supply, the voltage-controlled pulse circuit includes a first switching element, the reset signal circuit includes a second switching element, a control end of the reset signal circuit is electrically connected with the other end of a capacitor C3, a first end of the reset signal circuit is electrically connected with a first power supply and is electrically connected with a reset pin of a control chip of the electronic equipment, and a second end of the reset signal circuit is electrically connected to the ground. The key reset circuit of the invention enables the control chip to automatically enter a normal working mode or give a user a prompt for resetting success when the key is pressed and resetting is performed successfully.
Description
Technical field
The present invention relates to button resetting technique field, especially relate to a kind of button reset circuit of electronic equipment.
Background technology
The Bluetooth chip using in current bluetooth earphone is all while moving RESET pin to low level, causes Bluetooth chip and resets.When triggering Bluetooth chip in bluetooth earphone with button and carry out reset operation, because button is all in most cases multiplexing, general employing longly triggered reset by button.
Fig. 1 is existing reset circuit, as shown in Figure 1, in operating state, charged state and the DFU pattern of bluetooth earphone, (full name of DFU is Development FirmwareUpgrade, the actual meaning is exactly the pressure promotion and demotion pattern of iPhone firmware) under, the RESET pin of Bluetooth chip is pulled to high level.When button SW1 being pressed and do not unclamp, power supply VBAT gives capacitor C 1 charging through resistance R 2, when the voltage at capacitor C 1 two ends reaches the cut-in voltage of NPN triode Q1, and NPN triode Q1 conducting, RESET pin is dragged down, thereby Bluetooth chip is resetted.There is following defect in sort circuit: when by button SW1 and while not unclamping, RESET pin is dragged down, if do not unclamp button SW1, RESET pin just continues in dragging down state, under this state, in bluetooth earphone, the system of Bluetooth chip just can not enter normal mode of operation or reset and successfully point out to user.
Along with the development of bluetooth earphone technology, the design of bluetooth earphone is more and more diversified, and a lot of designs are all being selected button, and therefore, existing bluetooth earphone button reset circuit more and more can not meet the needs of bluetooth earphone.
Summary of the invention
Technical problem to be solved by this invention is: a kind of button reset circuit of electronic equipment is provided, automatically enters normal mode of operation after can making control chip in electronic equipment reset successfully or to user's successfully prompting that resets when pushing button.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of button reset circuit of electronic equipment, comprise button, and also comprise:
Delay circuit, the input of described delay circuit is electrically connected to the first power supply by described button;
Voltage comparator circuit, described voltage comparator circuit comprises a voltage comparator, and the output of described delay circuit is electrically connected to an input of described voltage comparator, and another input of described voltage comparator is electrically connected to second source;
Voltage-controlled impulse circuit, described voltage-controlled impulse circuit comprises the first switch element, described the first switch element comprises first end, the second end and for controlling the control end of described first end and described the second end conducting, its control end is electrically connected to the output of described voltage comparator, its first end is electrically connected to the first power supply, its second end is through resistance R 7 ground connection, and its second end is also electrically connected to one end of capacitor C 3;
Reset signal circuit, described reset signal circuit comprises second switch element, described second switch element comprises first end, the second end and for controlling the control end of its first end and the second end conducting, its control end is electrically connected to the other end of capacitor C 3, its first end is electrically connected to the 3rd power supply, and the reset pin of the control chip in electrical connection electronic equipment, its second end ground connection that is electrically connected.
Preferably, described the first switch element is triode or metal-oxide-semiconductor, and described second switch element is triode or metal-oxide-semiconductor.
Preferably, described second switch element is N-type metal-oxide-semiconductor or NPN triode.
Preferably, between the control end of described triode and the second end and between the connected device of control end, be all connected with for jamproof biasing resistor.
Preferably, between the control end of described metal-oxide-semiconductor and first end and between control end and the second end, be all connected with antistatic diode.
Preferably, the output of described delay circuit is electrically connected to the in-phase input end of described voltage comparator, and the inverting input of described voltage comparator is electrically connected to second source.
Preferably, described delay circuit comprises resistance R 2 and the diode D1 being connected in parallel, an input that common node is described delay circuit of described resistance R 2 and diode D1, ground connection after described input series resistance R1, the output that another common node of described resistance R 2 and diode D1 is described delay circuit, ground connection after described output series capacitance C1.
Preferably, described second source is 1.35V, and described the 3rd power supply is 1.8V.
Preferably, described capacitor C 3 is 0.46 μ F～2.2 μ F.
Adopted after technique scheme, the invention has the beneficial effects as follows:
Button reset circuit due to electronic equipment of the present invention, comprises button, also comprises delay circuit, voltage comparator circuit, voltage-controlled impulse circuit and reset signal circuit, and the input of delay circuit is electrically connected to the first power supply by button; Voltage comparator circuit comprises a voltage comparator, and the output of delay circuit is electrically connected to an input of voltage comparator, and another input of voltage comparator is electrically connected to second source; Voltage-controlled impulse circuit comprises the first switch element; Reset signal circuit comprises second switch element, and its control end is electrically connected to the other end of capacitor C 3, and its first end is electrically connected to the 3rd power supply, and is electrically connected to the RESET pin of the control chip in electronic equipment, its second end ground connection that is electrically connected.Reset (RESET) pin that the button reset circuit of electronic equipment of the present invention is applied to the control chip of electronic equipment resets.When control chip is in running order, (full name of DFU is Development FirmwareUpgrade for charged state or DFU pattern, the actual meaning is exactly the pressure promotion and demotion pattern of iPhone firmware) lower time, the reset pin of control chip is pulled to high level.When button is pressed and is not unclamped, the first power supply is electrically connected to the in-phase input end of voltage comparator after delay circuit time delay, compare with the inverting input second source of voltage comparator, when the voltage of delay circuit output is greater than second source, voltage comparator output high level, make the first switch element conducting, moment is to capacitor C 3 charging, produces a pulse allow the drop-down pulse of reset pin to control chip of second switch element transient switching through capacitor C 3.Make reset pin maintain the low level of a pulse, control chip is resetted.After this end-of-pulsing, second switch element is closed, and on the 3rd power supply, draws reset pin to become high level, makes the system of control chip automatically enter normal mode of operation or reset and successfully point out to user.Therefore, the button reset circuit of electronic equipment of the present invention, convert the long level signal of button to pulse signal, only act on the time of a pulse, do not affect control chip and after reset, enter normal operating state, in the process that continues to press at button, once reset successfully, the system of control chip just can automatically enter normal mode of operation or reset and successfully point out to user, convenient while making operating electronic equipment.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is the button reset circuit figure of existing bluetooth earphone;
Fig. 2 is the theory diagram of the button reset circuit of bluetooth earphone of the present invention;
Fig. 3 is the button reset circuit figure of the bluetooth earphone of embodiments of the invention one;
Fig. 4 is the button reset circuit figure of the bluetooth earphone of embodiments of the invention two.
Embodiment
Embodiment mono-
Fig. 2 is the theory diagram of the button reset circuit of bluetooth earphone of the present invention; Fig. 3 is the button reset circuit figure of the bluetooth earphone of embodiments of the invention one; With reference to Fig. 2 and Fig. 3, the button reset circuit of the bluetooth earphone of the present embodiment, comprises button, and the reset pin of the Bluetooth chip in bluetooth earphone is electrically connected to the first power supply, the first power supply is 1.8V, also comprises delay circuit, voltage comparator circuit, voltage-controlled impulse circuit and reset signal circuit.Wherein, reset pin is RESET pin.
Wherein, delay circuit comprises resistance R 2 and the diode D1 being connected in parallel, an input that common node is delay circuit of resistance R 2 and diode D1, ground connection after input series resistance R1, the output that another common node of resistance R 2 and diode D1 is delay circuit, ground connection after output series capacitance C1.The input of delay circuit is electrically connected to second source VBAT by button SW1, and the size of capacitor C 1 depends on that delay time requires and the resistance of resistance R 1, R2, R3, and for example, when R1 is 100 Ω, R2 is 1.5M Ω, and when R3 is 1M Ω, C1 can be 10 μ F.
Voltage comparator circuit comprises a voltage comparator U1, and the output of delay circuit is electrically connected to an input of voltage comparator U1, and another input of voltage comparator U1 is electrically connected to tertiary voltage power supply, and tertiary voltage power supply is 1.35V.In the present embodiment, the output of delay circuit is electrically connected to the in-phase input end of voltage comparator, and the inverting input of voltage comparator is electrically connected to tertiary voltage power supply.
Voltage-controlled impulse circuit comprises the first switch element Q1, in the present embodiment, the first switch element Q1 is N-type metal-oxide-semiconductor, the first switch element Q1 comprises first end, the second end and for controlling the control end of its first end and the second end conducting, its control end is electrically connected to the output of voltage comparator, its first end is electrically connected to second source VBAT, its second end is through resistance R 7 ground connection, its the second end is also electrically connected to one end of capacitor C 3, capacitor C 3 can be selected the resistance within the scope of 0.46 μ F～2.2 μ F, in the present embodiment, capacitor C 3 is 1uF.Between the control end of the first switch element Q1 and first end and between control end and the second end, be all connected with antistatic diode.
Reset signal circuit comprises second switch element Q2, second switch element Q2 is triode, second switch element Q2 comprises first end, the second end and for controlling the control end of its first end and the second end conducting, its control end is electrically connected to the other end of capacitor C 3, its first end is electrically connected to the reset pin of Bluetooth chip, its second end ground connection that is electrically connected, is all connected with for jamproof biasing resistor between the control end of second switch element Q2 and the second end and between the connected device of control end.In the present embodiment, second switch element Q2 is NPN triode, and certainly, second switch element Q2 also can select metal-oxide-semiconductor.
Embodiment bis-
Fig. 4 is the button reset circuit figure of the bluetooth earphone of embodiments of the invention two; With reference to Fig. 4, embodiment bis-and embodiment mono-are basic identical, and difference is: voltage-controlled impulse circuit comprises the first switch element Q1, and in the present embodiment, the first switch element is Q1 triode.Between the control end of the first switch element Q1 and the second end and between the connected device of control end, be all connected with for jamproof biasing resistor.
The reset pin that the button reset circuit of bluetooth earphone of the present invention is applied to the Bluetooth chip of bluetooth earphone resets.When Bluetooth chip is in running order, (full name of DFU is Development FirmwareUpgrade for charged state or DFU pattern, the actual meaning is exactly the pressure promotion and demotion pattern of iPhone firmware) lower time, the reset pin RESET of Bluetooth chip is pulled to high level.When button SW1 presses and does not unclamp, second source VBAT gives capacitor C 1 charging through the resistance R 2 in delay circuit, the charging end of capacitor C 1 is electrically connected to the in-phase input end of voltage comparator U1, 1.35V compares with voltage comparator U1 inverting input second source, when the voltage at capacitor C 1 two ends is greater than 1.35V, voltage comparator U1 exports high level, make the first switch element Q1 conducting, moment is to capacitor C 3 chargings, through capacitor C 3, produce a pulse and allow the drop-down pulse of reset pin RESET to Bluetooth chip of second switch element Q2 transient switching.Make RESET pin maintain the low level of a pulse, Bluetooth chip is resetted.After this end-of-pulsing, second switch element Q2 closes, and on the 3rd power supply, draws reset pin RESET to become high level, makes the system of Bluetooth chip automatically enter normal mode of operation or reset and successfully point out to user.Therefore, the button reset circuit of bluetooth earphone of the present invention, convert the long level signal of button SW1 to pulse signal, only act on the time of a pulse, do not affect Bluetooth chip and after reset, enter normal operating state, in the process that continues to press at button, once reset successfully, the system of Bluetooth chip just can automatically enter normal mode of operation or reset and successfully point out to user, convenient while making to operate bluetooth earphone.
It should be noted that, above-described embodiment be take bluetooth earphone and is illustrated as example, but button reset circuit of the present invention is not only applicable to bluetooth earphone, also be applicable to other electronic equipments with keypress function, such as audio frequency apparatuses such as audio amplifiers, the conversion equipments such as the display devices such as mobile phone, wrist-watch, camera, computer, intelligent glasses and remote controller, adapter.
The above is giving an example of best mode for carrying out the invention, and the part of wherein not addressing is in detail those of ordinary skills' common practise.Protection scope of the present invention is as the criterion with the content of claim, and any equivalent transformation carrying out based on technology enlightenment of the present invention, also within protection scope of the present invention.
Claims (10)
1. a button reset circuit for electronic equipment, comprises button, it is characterized in that, also comprises:
Delay circuit, the input of described delay circuit is electrically connected to the first power supply by described button;
Voltage comparator circuit, described voltage comparator circuit comprises a voltage comparator, and the output of described delay circuit is electrically connected to an input of described voltage comparator, and another input of described voltage comparator is electrically connected to second source;
Voltage-controlled impulse circuit, described voltage-controlled impulse circuit comprises the first switch element, described the first switch element comprises first end, the second end and for controlling the control end of its first end and the second end conducting, its control end is electrically connected to the output of described voltage comparator, its first end is electrically connected to the first power supply, its second end is through resistance R 7 ground connection, and its second end is also electrically connected to one end of capacitor C 3;
Reset signal circuit, described reset signal circuit comprises second switch element, described second switch element comprises first end, the second end and for controlling the control end of its first end and the second end conducting, its control end is electrically connected to the other end of capacitor C 3, its first end is electrically connected to the 3rd power supply, and the reset pin of the control chip in electrical connection electronic equipment, its second end ground connection that is electrically connected.
2. the button reset circuit of electronic equipment as claimed in claim 1, is characterized in that: described the first switch element is triode or metal-oxide-semiconductor, and described second switch element is triode or metal-oxide-semiconductor.
3. the button reset circuit of electronic equipment as claimed in claim 2, is characterized in that: described second switch element is N-type metal-oxide-semiconductor or NPN triode.
4. the button reset circuit of electronic equipment as claimed in claim 2, is characterized in that: between the control end of described triode and the second end and between the connected device of control end, be all connected with for jamproof biasing resistor.
5. the button reset circuit of electronic equipment as claimed in claim 2, is characterized in that: between the control end of described metal-oxide-semiconductor and first end and between control end and the second end, be all connected with antistatic diode.
6. the button reset circuit of electronic equipment as claimed in claim 1, is characterized in that: the output of described delay circuit is electrically connected to the in-phase input end of described voltage comparator, and the inverting input of described voltage comparator is electrically connected to second source.
7. the button reset circuit of the electronic equipment as described in claim 1 to 6 any one, it is characterized in that: described delay circuit comprises resistance R 2 and the diode D1 being connected in parallel, an input that common node is described delay circuit of described resistance R 2 and diode D1, ground connection after described input series resistance R1, the output that another common node of described resistance R 2 and diode D1 is described delay circuit, ground connection after described output series capacitance C1.
8. the button reset circuit of the electronic equipment as described in any one in claim 1 to 6, is characterized in that: described second source is 1.35V, and described the 3rd power supply is 1.8V.
9. the button reset circuit of the electronic equipment as described in any one in claim 1 to 6, is characterized in that: described capacitor C 3 is 0.46 μ F～2.2 μ F.
10. the button reset circuit of the electronic equipment as described in any one in claim 1 to 6, is characterized in that: described electronic equipment is audio frequency apparatus, display device or conversion equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310633443.XA CN103647534B (en) | 2013-11-29 | 2013-11-29 | The key reset circuit of a kind of electronics |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310633443.XA CN103647534B (en) | 2013-11-29 | 2013-11-29 | The key reset circuit of a kind of electronics |
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| CN103647534A true CN103647534A (en) | 2014-03-19 |
| CN103647534B CN103647534B (en) | 2016-06-08 |
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| CN201310633443.XA Active CN103647534B (en) | 2013-11-29 | 2013-11-29 | The key reset circuit of a kind of electronics |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104405673A (en) * | 2014-12-19 | 2015-03-11 | 浙江比洛德传动技术有限公司 | Operating device of intelligent fan control device applicable to vehicle cooling system |
| CN104407687A (en) * | 2014-12-09 | 2015-03-11 | 青岛歌尔声学科技有限公司 | Reset circuit |
| CN104510479A (en) * | 2014-12-12 | 2015-04-15 | 天津大学 | Blood oxygen acquisition system |
| CN106788360A (en) * | 2017-01-24 | 2017-05-31 | 深圳市冠旭电子股份有限公司 | A kind of reset circuit |
| CN107037865A (en) * | 2016-02-03 | 2017-08-11 | 中兴通讯股份有限公司 | Reset circuit and floating ground terminal |
| CN109510614A (en) * | 2017-09-15 | 2019-03-22 | 厦门雅迅网络股份有限公司 | One kind pressing key control device reset circuit and method |
| CN111321948A (en) * | 2020-02-21 | 2020-06-23 | 德施曼机电（中国）有限公司 | Intelligent lock with reset function |
| CN112306259A (en) * | 2020-10-30 | 2021-02-02 | 维沃移动通信有限公司 | Input device, electronic equipment and input method |
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| CN203590183U (en) * | 2013-11-29 | 2014-05-07 | 青岛歌尔声学科技有限公司 | Key reset circuit of electronic equipment |
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| CN101710251A (en) * | 2009-12-11 | 2010-05-19 | 深圳和而泰智能控制股份有限公司 | Single chip microcomputer halt reset circuit, device and method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407687A (en) * | 2014-12-09 | 2015-03-11 | 青岛歌尔声学科技有限公司 | Reset circuit |
| CN104510479A (en) * | 2014-12-12 | 2015-04-15 | 天津大学 | Blood oxygen acquisition system |
| CN104405673A (en) * | 2014-12-19 | 2015-03-11 | 浙江比洛德传动技术有限公司 | Operating device of intelligent fan control device applicable to vehicle cooling system |
| CN104405673B (en) * | 2014-12-19 | 2016-06-01 | 浙江比洛德传动技术有限公司 | The running device of a kind of fan intelligent control device being applicable to vehicle heat-removal system |
| CN107037865A (en) * | 2016-02-03 | 2017-08-11 | 中兴通讯股份有限公司 | Reset circuit and floating ground terminal |
| CN106788360A (en) * | 2017-01-24 | 2017-05-31 | 深圳市冠旭电子股份有限公司 | A kind of reset circuit |
| CN106788360B (en) * | 2017-01-24 | 2023-04-07 | 深圳市冠旭电子股份有限公司 | Reset circuit |
| CN109510614A (en) * | 2017-09-15 | 2019-03-22 | 厦门雅迅网络股份有限公司 | One kind pressing key control device reset circuit and method |
| CN109510614B (en) * | 2017-09-15 | 2022-10-28 | 厦门雅迅网络股份有限公司 | Reset circuit and method for key control equipment |
| CN111321948A (en) * | 2020-02-21 | 2020-06-23 | 德施曼机电（中国）有限公司 | Intelligent lock with reset function |
| CN112306259A (en) * | 2020-10-30 | 2021-02-02 | 维沃移动通信有限公司 | Input device, electronic equipment and input method |
| CN112306259B (en) * | 2020-10-30 | 2023-06-02 | 维沃移动通信有限公司 | Input device, input system and input method |
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| CN103647534B (en) | 2016-06-08 |
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