CN201789480U - Circuit reusing power on/off key for realizing reset function and portable mobile terminal - Google Patents
Circuit reusing power on/off key for realizing reset function and portable mobile terminal Download PDFInfo
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- CN201789480U CN201789480U CN2010205176676U CN201020517667U CN201789480U CN 201789480 U CN201789480 U CN 201789480U CN 2010205176676 U CN2010205176676 U CN 2010205176676U CN 201020517667 U CN201020517667 U CN 201020517667U CN 201789480 U CN201789480 U CN 201789480U
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Abstract
The utility model provides a circuit reusing a power on/off key for realizing a reset function, which comprises an enabling conducting circuit, a reset circuit and a discharging circuit. One end of the enabling conducting circuit is connected to an output pin of the power on/off key, and the other end of the enabling conducting circuit is connected to a power on/off enabling pin of a micro-control unit so as to isolate interference of the power on/off enabling pin to the reset circuit. One end of the reset circuit is connected to the power on/off key, the other end of the reset circuit connected to a power on/off reset pin of the micro-control unit, and the reset circuit is used for resetting the micro-control unit when the power on/off key is pressed and held down. The discharging circuit connected in parallel with the reset circuit is used for discharging electric charge resided in the reset circuit when the power on/off key is released. The circuit reusing a power on/off key for realizing a reset function reuses the functions of the power on/off key without affecting the power-on and power-off functions and other application operation functions of the power on/off key under the premise of not adding additional keys of an electronic product, is simple in circuit, low in cost and effectively resets a chip.
Description
Technical field
The utility model relates to the electronic product field, relates in particular to circuit and portable mobile termianl that a kind of multiplexing machine open/close button is realized reset function.
Background technology
For existing portable electronic products such as MP3 (Moving Picture Experts Group AudioLayer III) player (hereinafter to be referred as MP3), mobile phone, bluetooth earphone etc., all has MCU (MicroControl Unit, micro-control unit) to realize the operation of control program.But fly because some interference makes embedded program run, cause irregular incident generations such as deadlock.The method that solves after crashing has following several: the one, and can take product casing apart and take off battery, make the thorough power down shutdown of MCU, refilling battery starts shooting again, this method can realize in the production test stage, but along with the miniaturization and the sealing structureization of present this series products, this method is obviously infeasible for the daily use of consumer; A kind of is that reset pin by chip resets to MCU, and start is used again.MCU for present most of portable electronic products has such reset pin, to the low or high level signal of given a period of time of MCU reset pin MCU is successfully resetted.
Existing portable type electronic product has following several on reset processing, and a kind of is to consider that factors such as cost, outward appearance realization do not have such reset function; A kind of is that watchdog circuit is arranged in the circuit, can reset to MCU behind program fleet; Have an independently reset key on the another kind of electronic product, when crashing, utilize this individual reset button that MCU is resetted.
Above-mentioned reset processing mode all has certain deficiency: for the product that does not have reset function, can not reset timely and effectively when occurring crashing in design research and development, consumer use; Independently the watchdog circuit mode for the certain cost expense of watchdog circuit needs of special use, has increased the cost of electronic product; Adopt independently reset key, certainly will cause certain redundancy to the profile of product, and present portable electronic products increases day by day to the miniaturization of product, portability, the terseness of outward appearance, the requirement of fashion, the simplicity of the miniaturization of volume, profile makes the operation of man-machine interaction to be optimized so, also should reduce redundant component as much as possible to the requirement of outward appearance.
The utility model content
The utility model provides a kind of multiplexing machine open/close button to realize the circuit and the portable mobile termianl of reset function, to realize the purpose to the chip active homing.
To achieve these goals, the utility model provides a kind of multiplexing machine open/close button to realize the circuit and the portable mobile termianl of reset function, and technical scheme is as follows:
A kind of multiplexing machine open/close button is realized the circuit of reset function, comprising:
Enable turning circuit, the one end is connected to machine open/close button output pin, and the other end is connected to the machine open/close enable pin of micro-control unit, in order to cut off the interference of ON/OFF enable pin to reset circuit;
Reset circuit, one end are connected to described machine open/close button, and the other end is connected to the machine open/close reset pin of micro-control unit, in order at described machine open/close button by length on time, described micro-control unit are resetted;
The bleed off circuit, it is in parallel with described reset circuit, and in order to when described machine open/close button is released, bleed off resides in the electric charge of described reset circuit.
Preferably, described reset circuit comprises:
The 3rd resistance, one end are connected to described machine open/close button output pin;
Electric capacity, its minus earth, its positive pole is connected to the other end of described the 3rd resistance, and the base stage that is connected to the NPN triode by the series connection bleeder circuit that the 4th resistance and the 5th resistance form;
The NPN triode, its grounded emitter, collector electrode is connected on the reset pin of micro-control unit, is connected to the power supply of micro-control unit simultaneously by the 6th resistance.
Preferably, described reset circuit comprises:
The 3rd resistance, one end are connected to described machine open/close button output pin;
Electric capacity, its minus earth, its positive pole is connected to the other end of described the 3rd resistance, and the grid that is connected to N channel enhancement field effect transistor by the series connection bleeder circuit that the 4th resistance and the 5th resistance form;
N channel enhancement field effect transistor, its source ground, drain electrode is connected on the reset pin of micro-control unit, is connected to the power supply of micro-control unit simultaneously by the 6th resistance.
Preferably, described bleed off circuit comprises:
The discharge diode of second resistance and series connection with it;
Described second resistance, one end ground connection, the other end connects the positive pole of discharge diode, and described second resistance series connection discharge diode is in parallel with described the 3rd resistance.
Preferably, the described turning circuit that enables comprises: switching diode, the positive pole of described switching diode are connected to described machine open/close button, and the negative pole of described switching diode is connected to the machine open/close enable pin of described micro-control unit; Or
The described turning circuit that enables comprises: switching diode, the positive pole of described switching diode are connected to described machine open/close button, and the negative pole of described switching diode is connected to the machine open/close enable pin of described micro-control unit by first resistance.
The utility model also provides a kind of portable terminal, comprising:
Micro-control unit; And
Multiplexing machine open/close button is realized the circuit of reset function, and wherein, described circuit comprises:
Enable turning circuit, the one end is connected to machine open/close button output pin, and the other end is connected to the machine open/close enable pin of micro-control unit, in order to cut off the interference of ON/OFF enable pin to reset circuit;
Reset circuit, one end are connected to described machine open/close button, and the other end is connected to the machine open/close reset pin of micro-control unit, in order at described machine open/close button by length on time, described micro-control unit are resetted;
The bleed off circuit, it is in parallel with described reset circuit, and in order to when described machine open/close button is released, bleed off resides in the electric charge of described reset circuit.
Preferably, described reset circuit comprises:
The 3rd resistance, one end are connected to described machine open/close button output pin;
Electric capacity, its minus earth, its positive pole is connected to the other end of described the 3rd resistance, and the base stage that is connected to the NPN triode by the series connection bleeder circuit that the 4th resistance and the 5th resistance form;
The NPN triode, its grounded emitter, collector electrode is connected on the reset pin of micro-control unit, is connected to the power supply of micro-control unit simultaneously by the 6th resistance.
Preferably, described reset circuit comprises:
The 3rd resistance, one end are connected to described machine open/close button output pin;
Electric capacity, its minus earth, its positive pole is connected to the other end of described the 3rd resistance, and the grid that is connected to N channel enhancement field effect transistor by the series connection bleeder circuit that the 4th resistance and the 5th resistance form;
N channel enhancement field effect transistor, its source ground, drain electrode is connected on the reset pin of described micro-control unit, is connected to the power supply of micro-control unit simultaneously by the 6th resistance.
Preferably, described bleed off circuit comprises:
The discharge diode of second resistance and series connection with it;
Described second resistance, one end ground connection, the other end connects the positive pole of described discharge diode, and the described second resistance described discharge diode of connecting is in parallel with described the 3rd resistance.
Preferably, the described turning circuit that enables comprises: switching diode, the positive pole of described switching diode are connected to described machine open/close button, and the negative pole of described switching diode is connected to the machine open/close enable pin of described micro-control unit; Or
The described turning circuit that enables comprises: switching diode, the positive pole of described switching diode are connected to described machine open/close button, and the negative pole of described switching diode is connected to the machine open/close enable pin of described micro-control unit by first resistance.
The technical solution of the utility model is not increasing under the additional key prerequisite of electronic product, by multiplexing machine open/close keypress function, while does not influence the power on/off function of machine open/close button and uses other operating functions of this key, saved product space effectively, circuit is simple, with low cost, reached purpose to the chip active homing.
Description of drawings
Fig. 1 is the structure chart that a kind of multiplexing machine open/close button that the utility model provides is realized the circuit of reset function;
Fig. 2 is the detailed structure view that a kind of multiplexing machine open/close button that the utility model provides is realized the circuit of reset function.
Embodiment
In order to make technical problem to be solved in the utility model, technical scheme and beneficial effect clearer, clear,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The utility model provides a kind of multiplexing machine open/close button to realize the circuit of reset function, as shown in Figure 1, comprising:
Enable turning circuit, the one end is connected to machine open/close button output pin, and the other end is connected to the machine open/close enable pin of micro-control unit, in order to cut off the interference of ON/OFF enable pin to reset circuit;
Reset circuit, the one end is connected to the machine open/close button, and the other end is connected to the machine open/close reset pin of micro-control unit, in order at the machine open/close button by length on time, micro-control unit is resetted;
The bleed off circuit, it is in parallel with reset circuit, and in order to when the machine open/close button is released, bleed off resides in the electric charge of reset circuit.
Further, this reset circuit comprises:
The 3rd resistance, one end are connected to described machine open/close button output pin;
Electric capacity, its minus earth, its positive pole is connected to the other end of described the 3rd resistance, and the base stage that is connected to the NPN triode by the series connection bleeder circuit that the 4th resistance and the 5th resistance form;
The NPN triode, its grounded emitter, collector electrode is connected on the reset pin of micro-control unit, is connected to the power supply of micro-control unit simultaneously by the 6th resistance.
Further, this reset circuit comprises:
The 3rd resistance, one end are connected to described machine open/close button output pin;
Electric capacity, its minus earth, its positive pole is connected to the other end of described the 3rd resistance, and the grid that is connected to N channel enhancement field effect transistor by the series connection bleeder circuit that the 4th resistance and the 5th resistance form;
N channel enhancement field effect transistor, its source ground, drain electrode is connected on the reset pin of micro-control unit, is connected to the power supply of micro-control unit simultaneously by the 6th resistance.
Further, the bleed off circuit comprises:
The discharge diode of second resistance and series connection with it;
Second resistance, one end ground connection, the other end connects the positive pole of discharge diode, and this second resistance series connection discharge diode is in parallel with described the 3rd resistance.
Further, enable turning circuit and comprise: switching diode, the positive pole of this switching diode are connected to this machine open/close button, and the negative pole of this switching diode is connected to the machine open/close enable pin of this micro-control unit; Or
Enabling turning circuit comprises: switching diode, the positive pole of this switching diode are connected to this machine open/close button, and the negative pole of this switching diode is connected to the machine open/close enable pin of this micro-control unit by first resistance.
The utility model also provides a kind of portable terminal, and this portable terminal can be a consumer electronics product, comprises mobile phone, MP3, bluetooth earphone etc.This terminal comprises:
Micro-control unit; And
Multiplexing machine open/close button is realized the circuit of reset function, and wherein, this circuit comprises:
Enable turning circuit, the one end is connected to machine open/close button output pin, and the other end is connected to the machine open/close enable pin of micro-control unit, in order to cut off the interference of ON/OFF enable pin to reset circuit;
Reset circuit, one end are connected to described machine open/close button, and the other end is connected to the machine open/close reset pin of micro-control unit, in order at described machine open/close button by length on time, micro-control unit are resetted;
The bleed off circuit, it is in parallel with described reset circuit, and in order to when the machine open/close button is released, bleed off resides in the electric charge of described reset circuit.
Wherein, realize that about multiplexing machine open/close button the detailed structure of the circuit of reset function can not repeat them here referring to Fig. 1.
Below in conjunction with Fig. 2 the foregoing description is described in detail, but this description does not constitute the restriction to the utility model protection range.
As shown in Figure 2; machine open/close button SW1 one is connected to anode; the other end is connected to the machine open/close enable pin of MCU by switching diode D1; wherein; the effect of switching diode D1 is to cut off the interference of ON/OFF enable pin to reset circuit, and 1 pair of MCU ON/OFF of first resistance R enable pin plays current-limiting protection.Draw a branch road from machine open/close button SW1 output pin, the 3rd resistance R 3 is connected in this branch road.The other end series connection of the 3rd resistance R 3 inserts capacitor C 1 positive pole, capacitor C 1 minus earth.The positive pole of capacitor C 1 is connected to the base stage of NPN triode Q1 through series connection the 4th R4, and triode Q1 model can be BC847, simultaneously bleeder circuit of connecting of the 5th resistance R 5 and 4 formation of the 4th resistance R.The collector electrode of NPN triode Q1 is received on the reset pin of MCU, receives on the power supply of MCU through the 6th resistance R 6 simultaneously.The representative value of each components and parts can be as shown in Figure 2 in the circuit, but be not limited to above numerical value, and concrete numerical value can be adjusted according to actual conditions.Wherein, the NPN triode just needs for example, and in fact the NPN triode also can replace with N channel enhancement field effect transistor, and at this moment, NPN triode emission collection, collector electrode and base stage be source electrode, the drain and gate of corresponding N channel enhancement field effect transistor respectively.
The 3rd resistance R 3 forms a charging RC network with capacitor C 1, and calculate its representative value according to time constant and be: the 3rd resistance R 3 resistances are 2M ohm, and C1 appearance value is 10uF.Also can do suitable adjustment to the numerical value of the 3rd resistance R 3, capacitor C 1, to change the time that button resets according to concrete button time length needs.After machine open/close button SW1 pressed, cell voltage was through 1 charging of 3 pairs of capacitor C of the 3rd resistance R, and along with the increase of button time, the quantities of charge of capacitor C 1 constantly increases, and both end voltage increases gradually.When the voltage at capacitor C 1 two ends through the 4th resistance R 4, the 5th resistance R 5 through dividing potential drops enough greatly after, NPN triode Q1 enters into the saturation region, this moment, collector electrode and the emitter of NPN triode Q1 were similar to conducting, according to its triode feature set emitter-base bandgap grading voltage across poles is 0.2V-0.65V, and collector electrode is approximately low level.This moment, reset pin was dragged down, and after surpassing certain hour (being generally Millisecond), MCU enters into stable reset mode.The 4th resistance R 4 plays the effect to NPN triode Q1 base stage current limliting, and the 4th resistance R 4 is formed the bleeder circuit of connecting with the 5th resistance R 5 simultaneously, and for reducing the electric leakage in the circuit, the 4th resistance R 4, the 5th resistance R 5 values are million grades, and typical applicable value is 1M ohm.The 6th resistance R 6 can suitably be adjusted as biasing resistor, and typical applicable value is 220K ohm.
In the application of reality, the machine open/close button can often be pressed, such as the start on the mobile phone, hang up, withdraw from an operation, start on the bluetooth earphone, shut down, answer the call, hang up, double-click redialing, perhaps other actuation of keys etc. unintentionally, therefore must after on/off key is unclamped, electric charge resident in the capacitor C 1 be bled off, in order to avoid the lasting charging to electric capacity repeatedly accumulates and causes mistake to be restarted.As Fig. 2, in the utility model, discharge diode D2 of reversal connection in parallel on the 3rd resistance R 3, the model of discharge diode D2 can be BAS40L, and negative terminal series connection one second resistance R 2 of discharge diode D2 is to ground, and the resistance of second resistance R 2 is 20K ohm.After button unclamps, reside in that electric weight bleeds off by the discharge diode D2 and second resistance R 2 rapidly in the capacitor C 1,, make discharge time very short because second resistance R 2 is enough little, within a few tens of milliseconds, so just reached the effect that resident electric charge avoids mistake to reset in the quick bleed off capacitor C 1.
In lithium ion battery voltage 3.4V-4.2V scope, according to existing design circuit, press time that MCU enters into reset mode between 13 seconds to 25 seconds by the machine open/close button, and this time can be done appropriate change by adjusting in the circuit respective element parameter.In the ordinary course of things, the portable electronic products machine open/close button time was much smaller than 10 seconds, and other utilize the function button operating time of this key shorter, for example the ON/OFF switch uses as ESC Escape or hang-up key in the mobile phone, therefore, the reset function of this machine open/close button does not influence other functions of utilizing this ON/OFF switch.
The technical solution of the utility model is not increasing under the additional key prerequisite of electronic product, by multiplexing machine open/close keypress function, while does not influence the power on/off function of machine open/close button and uses other operating functions of this key, saved product space effectively, circuit is simple, with low cost, reached purpose to the chip active homing.
Above-mentioned explanation illustrates and has described a preferred embodiment of the present utility model, but as previously mentioned, be to be understood that the utility model is not limited to the disclosed form of this paper, should not regard eliminating as to other embodiment, and can be used for various other combinations, modification and environment, and can in utility model contemplated scope described herein, change by the technology or the knowledge of above-mentioned instruction or association area.And change that those skilled in the art carried out and variation do not break away from spirit and scope of the present utility model, then all should be in the protection range of the utility model claims.
Claims (10)
1. the circuit of a multiplexing machine open/close button realization reset function is characterized in that, comprising:
Enable turning circuit, the one end is connected to machine open/close button output pin, and the other end is connected to the machine open/close enable pin of micro-control unit, in order to cut off the interference of ON/OFF enable pin to reset circuit;
Reset circuit, one end are connected to described machine open/close button, and the other end is connected to the machine open/close reset pin of micro-control unit, in order at described machine open/close button by length on time, described micro-control unit are resetted;
The bleed off circuit, it is in parallel with described reset circuit, and in order to when described machine open/close button is released, bleed off resides in the electric charge of described reset circuit.
2. multiplexing machine open/close button as claimed in claim 1 is realized the circuit of reset function, it is characterized in that described reset circuit comprises:
The 3rd resistance, one end are connected to described machine open/close button output pin;
Electric capacity, its minus earth, its positive pole is connected to the other end of described the 3rd resistance, and the base stage that is connected to the NPN triode by the series connection bleeder circuit that the 4th resistance and the 5th resistance form;
The NPN triode, its grounded emitter, collector electrode is connected on the reset pin of micro-control unit, is connected to the power supply of micro-control unit simultaneously by the 6th resistance.
3. multiplexing machine open/close button as claimed in claim 1 is realized the circuit of reset function, it is characterized in that described reset circuit comprises:
The 3rd resistance, one end are connected to described machine open/close button output pin;
Electric capacity, its minus earth, its positive pole is connected to the other end of described the 3rd resistance, and the grid that is connected to N channel enhancement field effect transistor by the series connection bleeder circuit that the 4th resistance and the 5th resistance form;
N channel enhancement field effect transistor, its source ground, drain electrode is connected on the reset pin of micro-control unit, is connected to the power supply of micro-control unit simultaneously by the 6th resistance.
4. as the circuit of claim 2 or 3 described multiplexing machine open/close buttons realization reset functions, it is characterized in that described bleed off circuit comprises:
The discharge diode of second resistance and series connection with it;
Described second resistance, one end ground connection, the other end connects the positive pole of discharge diode, and described second resistance series connection discharge diode is in parallel with described the 3rd resistance.
5. multiplexing machine open/close button as claimed in claim 1 is realized the circuit of reset function, it is characterized in that,
The described turning circuit that enables comprises: switching diode, the positive pole of described switching diode are connected to described machine open/close button, and the negative pole of described switching diode is connected to the machine open/close enable pin of described micro-control unit; Or
The described turning circuit that enables comprises: switching diode, the positive pole of described switching diode are connected to described machine open/close button, and the negative pole of described switching diode is connected to the machine open/close enable pin of described micro-control unit by first resistance.
6. a portable terminal is characterized in that, comprising:
Micro-control unit; And
Multiplexing machine open/close button is realized the circuit of reset function, and wherein, described circuit comprises:
Enable turning circuit, the one end is connected to machine open/close button output pin, and the other end is connected to the machine open/close enable pin of micro-control unit, in order to cut off the interference of ON/OFF enable pin to reset circuit;
Reset circuit, one end are connected to described machine open/close button, and the other end is connected to the machine open/close reset pin of micro-control unit, in order at described machine open/close button by length on time, described micro-control unit are resetted;
The bleed off circuit, it is in parallel with described reset circuit, and in order to when described machine open/close button is released, bleed off resides in the electric charge of described reset circuit.
7. portable terminal as claimed in claim 6 is characterized in that, described reset circuit comprises:
The 3rd resistance, one end are connected to described machine open/close button output pin;
Electric capacity, its minus earth, its positive pole is connected to the other end of described the 3rd resistance, and the base stage that is connected to the NPN triode by the series connection bleeder circuit that the 4th resistance and the 5th resistance form;
The NPN triode, its grounded emitter, collector electrode is connected on the reset pin of micro-control unit, is connected to the power supply of micro-control unit simultaneously by the 6th resistance.
8. portable terminal as claimed in claim 6 is characterized in that, described reset circuit comprises:
The 3rd resistance, one end are connected to described machine open/close button output pin;
Electric capacity, its minus earth, its positive pole is connected to the other end of described the 3rd resistance, and the grid that is connected to N channel enhancement field effect transistor by the series connection bleeder circuit that the 4th resistance and the 5th resistance form;
N channel enhancement field effect transistor, its source ground, drain electrode is connected on the reset pin of described micro-control unit, is connected to the power supply of micro-control unit simultaneously by the 6th resistance.
9. as claim 7 or 8 described portable terminals, it is characterized in that described bleed off circuit comprises:
The discharge diode of second resistance and series connection with it;
Described second resistance, one end ground connection, the other end connects the positive pole of described discharge diode, and the described second resistance described discharge diode of connecting is in parallel with described the 3rd resistance.
10. portable terminal as claimed in claim 6 is characterized in that,
The described turning circuit that enables comprises: switching diode, the positive pole of described switching diode are connected to described machine open/close button, and the negative pole of described switching diode is connected to the machine open/close enable pin of described micro-control unit; Or
The described turning circuit that enables comprises: switching diode, the positive pole of described switching diode are connected to described machine open/close button, and the negative pole of described switching diode is connected to the machine open/close enable pin of described micro-control unit by first resistance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205176676U CN201789480U (en) | 2010-09-02 | 2010-09-02 | Circuit reusing power on/off key for realizing reset function and portable mobile terminal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010205176676U CN201789480U (en) | 2010-09-02 | 2010-09-02 | Circuit reusing power on/off key for realizing reset function and portable mobile terminal |
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| CN201789480U true CN201789480U (en) | 2011-04-06 |
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| CN102868387A (en) * | 2012-09-12 | 2013-01-09 | 广东欧珀移动通信有限公司 | Level jump reset IC (integrated circuit) design circuit |
| CN102882496A (en) * | 2012-09-25 | 2013-01-16 | 宁德时代新能源科技有限公司 | Circuit with switch detection and microcontroller reset functions |
| CN103092299A (en) * | 2011-10-31 | 2013-05-08 | 成都高新区尼玛电子产品外观设计工作室 | Reset design circuit of system power on/off signal pin |
| CN103149997A (en) * | 2013-02-05 | 2013-06-12 | 福兴达科技实业（深圳）有限公司 | Mobile device and reset method thereof |
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| CN106095040A (en) * | 2016-06-07 | 2016-11-09 | 青岛歌尔声学科技有限公司 | A kind of key control circuit and electronic product |
| CN106760993A (en) * | 2016-12-12 | 2017-05-31 | 上海图正信息科技股份有限公司 | A kind of electronic lock |
| CN106760993B (en) * | 2016-12-12 | 2019-08-20 | 上海图正信息科技股份有限公司 | A kind of electronic lock |
| CN106788361A (en) * | 2017-03-31 | 2017-05-31 | 东莞博力威电池有限公司 | MCU is long to press reset circuit |
| CN106788361B (en) * | 2017-03-31 | 2023-04-11 | 广东博力威科技股份有限公司 | MCU long-press reset circuit |
| CN108173424A (en) * | 2017-12-25 | 2018-06-15 | 四川长虹电器股份有限公司 | A kind of portable device supply power soft switch system |
| CN108563294A (en) * | 2018-04-02 | 2018-09-21 | 郑州云海信息技术有限公司 | A kind of server management system that ID buttons are multi-purpose |
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Granted publication date: 20110406 |