CN103647534B - The key reset circuit of a kind of electronics - Google Patents
The key reset circuit of a kind of electronics Download PDFInfo
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- CN103647534B CN103647534B CN201310633443.XA CN201310633443A CN103647534B CN 103647534 B CN103647534 B CN 103647534B CN 201310633443 A CN201310633443 A CN 201310633443A CN 103647534 B CN103647534 B CN 103647534B
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Abstract
The present invention discloses the key reset circuit of a kind of electronics, comprises button, also comprises time delay circuit, voltage comparator circuit, voltage-controlled pulsing circuit and reset signal circuit, and the input terminus of time delay circuit is connected with the 2nd power electric by button; Voltage comparator circuit comprises a voltage comparator, an input terminus of the output terminal electrical connection voltage comparator of time delay circuit, another input terminus electrical connection the 3rd voltage source of voltage comparator; Voltage-controlled pulsing circuit comprises the first switching element; Reset signal circuit comprises the 2nd switching element, and the other end of its control end electrical connection electric capacity C3, its first end is electrically connected the first power supply, and the reset pin of the control chip of electronics, and its 2nd end is electrically connected ground connection. The key reset circuit of the present invention, it is possible to control chip is resetted when pressing button and automatically enters normal operating mode after successfully or reset successfully prompting to user.
Description
Technical field
The present invention relates to button resetting technique field, especially relate to the key reset circuit of a kind of electronics.
Background technology
When the Bluetooth chip used in current bluetooth earphone is all move RESET pin to lower level, causes Bluetooth chip and reset. When use button trigger the Bluetooth chip in bluetooth earphone carry out reset operate time, because being all multiplexing in the most of situation of button, general employing long triggers reset by button.
Fig. 1 is existing reset circuit, as shown in Figure 1, at the working order of bluetooth earphone, charging state and DFU mode, (full name of DFU is DevelopmentFirmwareUpgrade, 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 being pressed by button SW1 and do not unclamp, power supply VBAT charges to electric capacity C1 through resistance R2, and when the voltage at electric capacity C1 two ends reaches the cut-in voltage of NPN triode Q1, NPN triode Q1 conducting, RESET pin is drawn low, thus Bluetooth chip is resetted. There is following defect in this kind of circuit: when by button SW1 and when not unclamping, RESET pin has been drawn low, if not unclamping button SW1, RESET pin just continues to be in and draws in low state, under this kind of state, in bluetooth earphone, the system of Bluetooth chip just can not enter normal operating mode or reset to user and successfully point out.
Along with the development of bluetooth earphone technology, the design of bluetooth earphone is more and more diversified, and a lot of design is all selecting button, and therefore, existing bluetooth earphone key 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: the key reset circuit providing a kind of electronics, it is possible to the control chip in electronics is resetted when pressing button and automatically enters normal operating mode after successfully or reset successfully prompting to user.
For solving the problems of the technologies described above, the technical scheme of the present invention is: the key reset circuit of a kind of electronics, comprises button, also comprises:
Time delay circuit, the input terminus of described time delay circuit is connected with the first power electric by described button;
Voltage comparator circuit, described voltage comparator circuit comprises a voltage comparator, and the output terminal of described time delay circuit is electrically connected an input terminus of described voltage comparator, another input terminus electrical connection the 2nd power supply of described voltage comparator;
Voltage-controlled pulsing circuit, described voltage-controlled pulsing circuit comprises the first switching element, described first switching element comprises first end, the 2nd end and for controlling described first end and the control end of described 2nd end conducting, its control end is electrically connected the output terminal of described voltage comparator, its first end is electrically connected the first power supply, its the 2nd end is through resistance R7 ground connection, and its 2nd end is also electrically connected one end of electric capacity C3;
Reset signal circuit, described reset signal circuit comprises the 2nd switching element, described 2nd switching element comprises first end, the 2nd end and for controlling its first end and the control end of the 2nd end conducting, the other end of its control end electrical connection electric capacity C3, its first end electrical connection the 3rd power supply, and the reset pin of the control chip in electrical connection electronics, its 2nd end is electrically connected ground connection.
Preferably, described first switching element is triode, and described 2nd switching element is triode.
Preferably, described 2nd switching element is N-type MOS pipe or NPN triode.
Preferably, between the control end of described NPN triode and the 2nd end and be all connected with for anti-interference biasing resistor between the connected device of control end.
Preferably, between the control end of described N-type MOS pipe and first end and be all connected with anti-electrostatic diode between control end and the 2nd end.
Preferably, the output terminal of described time delay circuit is electrically connected the in-phase input end of described voltage comparator, inverting input electrical connection the 2nd power supply of described voltage comparator.
Preferably, described time delay circuit comprises the resistance R2 and diode D1 that are connected in parallel, a common node of described resistance R2 and diode D1 is the input terminus of described time delay circuit, ground connection after described input terminus series resistance R1, another common node of described resistance R2 and diode D1 is the output terminal of described time delay circuit, ground connection after described output terminal series capacity C1.
Preferably, described 2nd power supply is 1.35V, and described 3rd power supply is 1.8V.
Preferably, described electric capacity C3 is 0.46 �� F��2.2 �� F.
After have employed technique scheme, the invention has the beneficial effects as follows:
Due to the key reset circuit of the electronics of the present invention, comprising button, also comprise time delay circuit, voltage comparator circuit, voltage-controlled pulsing circuit and reset signal circuit, the input terminus of time delay circuit is connected with the first power electric by button; Voltage comparator circuit comprises a voltage comparator, an input terminus of the output terminal electrical connection voltage comparator of time delay circuit, another input terminus electrical connection the 2nd power supply of voltage comparator; Voltage-controlled pulsing circuit comprises the first switching element; Reset signal circuit comprises the 2nd switching element, the other end of its control end electrical connection electric capacity C3, its first end electrical connection the 3rd power supply, and the RESET pin of control chip in electrical connection electronics, and its 2nd end is electrically connected ground connection. Reset (RESET) pin of the control chip that the key reset circuit of the electronics of the present invention is applied to electronics resets. When control, chip is in running order, (full name of DFU is DevelopmentFirmwareUpgrade for charging state or DFU mode, the actual meaning is exactly the pressure promotion and demotion pattern of iPhone firmware) under time, the reset pin of control chip is pulled to high level. When button is pressed and does not unclamp, first power supply is electrically connected to the in-phase input end of voltage comparator after time delay circuit time delay, compare with the inverting input of voltage comparator the 2nd power supply, when the voltage of time delay circuit output terminal is greater than the 2nd power supply, voltage comparator exports high level, make the first switching element conducting, charge to instantaneously electric capacity C3, produce a pulse through electric capacity C3 and allow the 2nd switching element moment conducting to reset pin drop-down pulse of control chip. Make reset pin maintain the lower level of a pulse, make control chip reset. After this end-of-pulsing, the 2nd switching element is closed, and the 3rd power supply pull-up reset pin becomes high level, makes the system of control chip automatically enter normal operating mode or reset to user and successfully points out. Therefore, the key reset circuit of the electronics of the present invention, convert the long level signal of button to pulse signal, the only time of an effect pulse, not affecting control chip and enter normal working order after the reset, continuing at button in the process pressed, once reset successfully, the system of control chip just can automatically enter normal operating mode or reset to user and successfully point out, convenient when making operating electronic equipment.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is the key reset circuit figure of existing bluetooth earphone;
Fig. 2 is the functional block diagram of the key reset circuit of the bluetooth earphone of the present invention;
Fig. 3 is the key reset circuit figure of the bluetooth earphone of embodiments of the invention one;
Fig. 4 is the key reset circuit figure of the bluetooth earphone of embodiments of the invention two.
Embodiment
Embodiment one
Fig. 2 is the functional block diagram of the key reset circuit of the bluetooth earphone of the present invention; Fig. 3 is the key reset circuit figure of the bluetooth earphone of embodiments of the invention one; With reference to Fig. 2 and Fig. 3, the key 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 the first power supply, first power supply is 1.8V, also comprises time delay circuit, voltage comparator circuit, voltage-controlled pulsing circuit and reset signal circuit. Wherein, reset pin is RESET pin.
Wherein, time delay circuit comprises the resistance R2 and diode D1 that are connected in parallel, a common node of resistance R2 and diode D1 is the input terminus of time delay circuit, ground connection after input terminus series resistance R1, another common node of resistance R2 and diode D1 is the output terminal of time delay circuit, ground connection after output terminal series capacity C1. The input terminus of time delay circuit is electrically connected with the 2nd power supply VBAT by button SW1, and the size of electric capacity C1 depends on the resistance of the requirement of time delay time and resistance R1, R2, R3, and such as, when R1 be 100 ��, R2 be 1.5M ��, R3 is 1M ��, C1 can be 10 �� F.
Voltage comparator circuit comprises a voltage comparator U1, an input terminus of the output terminal electrical connection voltage comparator U1 of time delay circuit, and another input terminus electrical connection the 3rd voltage source of voltage comparator U1, the 3rd voltage source is 1.35V. In the present embodiment, the in-phase input end of the output terminal electrical connection voltage comparator of time delay circuit, inverting input electrical connection the 3rd voltage source of voltage comparator.
Voltage-controlled pulsing circuit comprises the first switching element Q1, in the present embodiment, first switching element Q1 is N-type MOS pipe, first switching element Q1 comprises first end, the 2nd end and for controlling its first end and the control end of the 2nd end conducting, the output terminal of its control end electrical connection voltage comparator, its first end electrical connection the 2nd power supply VBAT, its the 2nd end is through resistance R7 ground connection, its the 2nd end is also electrically connected one end of electric capacity C3, electric capacity C3 can select the resistance within the scope of 0.46 �� F��2.2 �� F, in the present embodiment, electric capacity C3 is 1uF. Anti-electrostatic diode all it is connected with between the control end of the first switching element Q1 and first end and between control end and the 2nd end.
Reset signal circuit comprises the 2nd switching element Q2,2nd switching element Q2 is triode, 2nd switching element Q2 comprises first end, the 2nd end and for controlling its first end and the control end of the 2nd end conducting, the other end of its control end electrical connection electric capacity C3, the reset pin of its first end electrical connection Bluetooth chip, its the 2nd end is electrically connected ground connection, is all connected with for anti-interference biasing resistor between the control end of the 2nd switching element Q2 and the 2nd end and between the connected device of control end. In the present embodiment, the 2nd switching element Q2 is NPN triode, and certainly, the 2nd switching element Q2 can also select MOS to manage.
Embodiment two
Fig. 4 is the key reset circuit figure of the bluetooth earphone of embodiments of the invention two; With reference to Fig. 4, embodiment two is substantially identical with embodiment one, and difference is: voltage-controlled pulsing circuit comprises the first switching element Q1, and in the present embodiment, the first switching element is Q1 triode. All it is connected with for anti-interference biasing resistor between the control end of the first switching element Q1 and the 2nd end and between the connected device of control end.
The reset pin of the Bluetooth chip that the key reset circuit of the bluetooth earphone of the present invention is applied to bluetooth earphone resets. when Bluetooth chip is in running order, (full name of DFU is DevelopmentFirmwareUpgrade for charging state or DFU mode, the actual meaning is exactly the pressure promotion and demotion pattern of iPhone firmware) under time, the reset pin RESET of Bluetooth chip is pulled to high level. when button SW1 presses and does not unclamp, the resistance R2 of 2nd power supply VBAT in time delay circuit charges to electric capacity C1, the charging end of electric capacity C1 is electrically connected to the in-phase input end of voltage comparator U1, compare with voltage comparator U1 inverting input the 2nd power supply 1.35V, when the voltage at electric capacity C1 two ends is greater than 1.35V, voltage comparator U1 exports high level, make the first switching element Q1 conducting, charge to instantaneously electric capacity C3, producing a pulse through electric capacity C3 allows the 2nd switching element Q2 moment conducting to reset pin RESET drop-down pulse of Bluetooth chip. make RESET pin maintain the lower level of a pulse, Bluetooth chip is resetted. after this end-of-pulsing, the 2nd switching element Q2 closes, and the 3rd power supply pull-up reset pin RESET becomes high level, makes the system of Bluetooth chip automatically enter normal operating mode or reset to user and successfully points out. therefore, the key reset circuit of the bluetooth earphone of the present invention, convert the long level signal of button SW1 to pulse signal, the only time of an effect pulse, do not affect Bluetooth chip and enter normal working order after the reset, continue at button in the process pressed, once reset successfully, the system of Bluetooth chip just can automatically enter normal operating mode or reset successfully prompting to user, convenient when making operation bluetooth earphone.
It should be noted that, above-described embodiment illustrates for bluetooth earphone, but the key reset circuit of the present invention is not only applicable to bluetooth earphone, also it is applicable to other electronicss with keypress function, the audio-frequency apparatuses such as such as audio amplifier, display equipment and the translating eqipments such as telepilot, adapter such as mobile phone, wrist-watch, camera, computer, intelligent glasses.
The above is the citing of best mode for carrying out the invention, and the part wherein do not addressed in detail is the common practise of those of ordinary skill in the art. Protection scope of the present invention is as the criterion with the content of claim, the equivalent transformation that any technology based on the present invention is enlightened and carried out, also within protection scope of the present invention.
Claims (10)
1. a key reset circuit for electronics, comprises button, it is characterised in that, also comprise:
Time delay circuit, the input terminus of described time delay circuit is connected with the first power electric by described button;
Voltage comparator circuit, described voltage comparator circuit comprises a voltage comparator, and the output terminal of described time delay circuit is electrically connected an input terminus of described voltage comparator, another input terminus electrical connection the 2nd power supply of described voltage comparator;
Voltage-controlled pulsing circuit, described voltage-controlled pulsing circuit comprises the first switching element, described first switching element comprises first end, the 2nd end and for controlling its first end and the control end of the 2nd end conducting, its control end is electrically connected the output terminal of described voltage comparator, its first end is electrically connected the first power supply, its the 2nd end is through resistance R7 ground connection, and its 2nd end is also electrically connected one end of electric capacity C3;
Reset signal circuit, described reset signal circuit comprises the 2nd switching element, described 2nd switching element comprises first end, the 2nd end and for controlling its first end and the control end of the 2nd end conducting, the other end of its control end electrical connection electric capacity C3, its first end electrical connection the 3rd power supply, and the reset pin of the control chip in electrical connection electronics, its 2nd end is electrically connected ground connection.
2. the key reset circuit of electronics as claimed in claim 1, it is characterised in that: described first switching element is triode, and described 2nd switching element is triode.
3. the key reset circuit of electronics as claimed in claim 2, it is characterised in that: described 2nd switching element is N-type MOS pipe or NPN triode.
4. the key reset circuit of electronics as claimed in claim 3, it is characterised in that: all it is connected with for anti-interference biasing resistor between the control end of described NPN triode and the 2nd end and between the connected device of control end.
5. the key reset circuit of electronics as claimed in claim 3, it is characterised in that: all it is connected with anti-electrostatic diode between the control end of described N-type MOS pipe and first end and between control end and the 2nd end.
6. the key reset circuit of electronics as claimed in claim 1, it is characterised in that: the output terminal of described time delay circuit is electrically connected the in-phase input end of described voltage comparator, inverting input electrical connection the 2nd power supply of described voltage comparator.
7. the key reset circuit of electronics as described in item as arbitrary in claim 1 to 6, it is characterized in that: described time delay circuit comprises the resistance R2 and diode D1 that are connected in parallel, a common node of described resistance R2 and diode D1 is the input terminus of described time delay circuit, ground connection after described input terminus series resistance R1, another common node of described resistance R2 and diode D1 is the output terminal of described time delay circuit, ground connection after described output terminal series capacity C1.
8. the key reset circuit of electronics as according to any one of claim 1 to 6, it is characterised in that: described 2nd power supply is 1.35V, and described 3rd power supply is 1.8V.
9. the key reset circuit of electronics as according to any one of claim 1 to 6, it is characterised in that: described electric capacity C3 is 0.46 �� F��2.2 �� F.
10. the key reset circuit of electronics as according to any one of claim 1 to 6, it is characterised in that: described electronics is audio-frequency apparatus, display equipment or translating eqipment.
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 CN103647534A (en) | 2014-03-19 |
| CN103647534B true 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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Families Citing this family (8)
| 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 |
| 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 |
| CN107037865B (en) * | 2016-02-03 | 2022-09-16 | 中兴通讯股份有限公司 | Reset circuit and floating terminal |
| CN106788360B (en) * | 2017-01-24 | 2023-04-07 | 深圳市冠旭电子股份有限公司 | Reset circuit |
| 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 |
| CN111321948B (en) * | 2020-02-21 | 2021-04-13 | 德施曼机电（中国）有限公司 | Intelligent lock with reset function |
| 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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| 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 |
| CN201590882U (en) * | 2009-12-29 | 2010-09-22 | 歌尔声学股份有限公司 | Bluetooth headset |
| CN203180871U (en) * | 2013-03-27 | 2013-09-04 | 潍坊歌尔电子有限公司 | Bluetooth earphone reset circuit |
| 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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Patent Citations (4)
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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 |
| CN201590882U (en) * | 2009-12-29 | 2010-09-22 | 歌尔声学股份有限公司 | Bluetooth headset |
| CN203180871U (en) * | 2013-03-27 | 2013-09-04 | 潍坊歌尔电子有限公司 | Bluetooth earphone reset circuit |
| 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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| CN103647534A (en) | 2014-03-19 |
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