CN201846323U - Reset circuit and terminal - Google Patents
Reset circuit and terminal Download PDFInfo
- Publication number
- CN201846323U CN201846323U CN2010205853262U CN201020585326U CN201846323U CN 201846323 U CN201846323 U CN 201846323U CN 2010205853262 U CN2010205853262 U CN 2010205853262U CN 201020585326 U CN201020585326 U CN 201020585326U CN 201846323 U CN201846323 U CN 201846323U
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- Prior art keywords
- triode
- resistance
- reset
- charging
- reset circuit
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- Expired - Lifetime
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Abstract
The utility model discloses a reset circuit and a terminal. The reset circuit comprises a capacitor, a first resistor and an NPN-type (negative-positive-negative) triode, wherein one end of the capacitor is connected to a power interface of a charging branch circuit; the other end of the capacitor is connected in series with the first resistor; the other end of the first resistor is connected to a base of the triode; an emitter of the triode is earthed; a collector of the triode is connected with a reset pin of a main control chip; and the collector of the triode keeps high level. The utility model has the advantages that the appearance experience of the terminal is improved, and the cost is low.
Description
Technical field
The utility model relates to a kind of reset circuit and terminal.
Background technology
(comprising: portable consumer product) for example, MP3 player (being designated hereinafter simply as MP3), bluetooth earphone etc. are all realized the operation of program to terminal by the micro-control unit (Micro Control Unit abbreviates MCU as) of main control chip.Yet some interference may make embedded program run and flies, thereby has caused incident generation such as deadlocks.
At present, the method that solves after product crashes has following several: the one, take product casing apart, and take off battery, chip is shut down by force, then, connect battery again and start shooting again.Yet along with the miniaturization and the sealingization of present this series products, this method is more and more infeasible for the daily use of consumer.Another kind method is that the reset pin by main control chip resets to MCU, and start is used again again.But some terminal is considered the restriction of cost, printed circuit board (PCB) (printed circuit board abbreviates PCB as) cloth board space, product design etc., does not have such reset function.At present, can realize resetting by following dual mode: first kind provides an external independently reset key, and this reset key links to each other with the MCU reset pin, presses this reset key and reaches purpose to chip reset; Second kind is, increases to have the watchdog device that prevents program fleet in circuit design, in case system in case of system halt, this circuit can reset to chip.
For first kind, be equivalent on the profile of product, increase a function key, this miniaturization concerning outward appearance, streamlined, man-machine interaction are required the strict day by day consumer electronics product, and increasing this redundant component influence outward appearance, the user experience value of reduction product; For watchdog device mode independently, need to increase separately special-purpose watchdog circuit, thereby cost is higher.
The utility model content
The circuit that provides a kind of charging to reset is provided main purpose of the present utility model, to address the above problem at least.
According to an aspect of the present utility model, a kind of reset circuit is provided, has comprised: electric capacity, first resistance and NPN type triode, wherein, one end of described electric capacity is connected on the power interface of charging paths, and the other end of described electric capacity is connected with described first resistance; The other end of described first resistance is connected on the base stage of described triode; The emitter grounding of described triode; The collector electrode of described triode links to each other with the reset pin of main control chip, and the collector electrode of described triode keeps high level.
Further, also comprise: second resistance, wherein, an end of described second resistance is connected with the collector electrode of described triode, and the other end keeps high level.
Further, be under the situation of 5V in the charging voltage of described charging paths, described capacitance size is 1uF, described first resistance is 50K ohm.
According to another aspect of the present utility model, a kind of terminal is provided, comprise above-mentioned reset circuit.
By the utility model, solved that the Implementation for Reset Function mode need increase extra function key or cost problem of higher in the prior art, and then improved terminal appearance experience, cost is lower.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, constitutes the application's a part, and illustrative examples of the present utility model and explanation thereof are used to explain the utility model, do not constitute improper qualification of the present utility model.In the accompanying drawings:
Fig. 1 is the schematic diagram according to the charging reset circuit of the utility model embodiment.
Embodiment
Hereinafter will describe the utility model with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Fig. 1 is the schematic diagram according to the charging reset circuit of the utility model embodiment, as shown in Figure 1, this reset circuit comprises: capacitor C 1, first resistance R 1 and NPN type triode Q1, in Fig. 1, also show, charging inlet 1, charging paths 2 and MCU3, wherein, an end of electric capacity is connected on the power interface of charging paths 2, and the other end of capacitor C 1 is connected with first resistance R 1; The other end of first resistance R 1 is connected on the base stage of triode Q1; The emitter grounding of triode Q1; The collector electrode of triode Q1 links to each other with the reset pin of main control chip 31, and the collector electrode of triode Q1 keeps high level (being expressed as VDD_MCU in Fig. 1).
By on the charging paths 2 of terminal, drawing a branch road to reset circuit, comprise in the reset circuit that a capacitor C 1 is connected in the circuit, and a series resistance R1 (i.e. first resistance), a NPN type triode Q1 plays on-off action.The collector electrode of triode Q1 is connected on the reset pin 31 of main control chip on (preferably can by a pull-up resistor) and moves high level to.When charger inserts, charging paths 2 is charged to series capacitance C1 immediately, thereby making that triode Q1 base voltage is enough high makes triode Q1 emitter-base bandgap grading and collector electrode conducting, because triode Q1 emitter grounding, thereby then make reset pin 31 keep the low level of certain hour to make chip successfully reset.Along with continuation charging to charging capacitor, triode Q1 base voltage is step-down gradually, after having arrived certain threshold voltage, triode is closed, thereby master chip reset pin 31 is drawn high again and is jumped out reset mode, like this main control chip just can carry out other such as to the normal runnings such as charging of lithium battery.
Need to prove, as long as just can reach when charging in succession the purpose of reset (being designated hereinafter simply as charging resets) at the collector electrode maintenance high level of triode Q1, certainly, preferably, as shown in Figure 1, second resistance R 2 can also be set, wherein, one end of second resistance R 2 is connected with the collector electrode of triode Q1, and the other end keeps high level.
By above-mentioned reset circuit at the additional external button that does not increase terminal and minimize under the prerequisite of cost, multiplexing portable consumer electronics product charging inlet, and utilize and to its action of inserting charging this charging reset circuit can effectively be resetted to master chip.
Preferably, be under the situation of 5V in the charging voltage of charging paths, capacitance size is 1uF, first resistance is 50K ohm.
Below in conjunction with Fig. 1 a preferred embodiment is described.
As shown in Figure 1, be connected on the power pins of charging inlet 1 for the charging paths 2 of battery (for example lithium ion battery) charging, this charging inlet can be USB interface or other forms of interface, draw a branch road in the charging paths 2 on capacitor C 1, the other end of C1 is connected with resistance R 1, the other end of resistance R 1 is received on the base stage of NPN triode Q1, and like this, the base stage of C1, R1, Q1 is cascaded.Wherein, the emitter grounding of Q1, collector electrode are connected on the reset pin 31 of MCU, and collector electrode is by moving high level on the pull-up resistor R2 simultaneously.When master chip was worked, this pull-up resistor can guarantee that the reset pin 31 of MCU puts height, thereby avoids resetting.
Be to describe for example about 5V below with the charger voltage, charger inserts when charging, because capacitor C 1 has the maintenance effect to its both end voltage, therefore make the Q1 base stage remain the triode base emitter-base bandgap grading threshold voltage that high level also surpasses 0.7V, make the complete conducting of transistor collector and emitter-base bandgap grading, in addition, because the emitter grounding of Q1, make collector electrode also reach low level at this moment, the MCU that resets for low level keeps the low level of certain hour that MCU is successfully resetted on reset pin 31 like this.Because the base stage of charger voltage process R1, Q1 and emitter-base bandgap grading electrode resistance are to the charging of C1, make the C1 both end voltage become big gradually, the voltage of triode Q1 base stage just diminishes gradually, during the Q1 base voltage is opened less than triode after a period of time like this threshold voltage, triode is closed, and jumps out reset mode thereby make collector electrode get back to high level.Suitably adjust C1, R1 numerical value, thereby adjust the time constant of this RC charging circuit, make just can make triode ON time long enough MCU reset pin 31 maintenance low level time long enoughs and reach reliable reset.Simultaneously, this ON time is unsuitable long, in order to avoid influence MCU other operate as normal afterwards that reset.The C1 representative value is 1uF, and the R1 representative value is 50K ohm.On the other hand, when charger was extracted, the electric charge of the last storage of C1 can pass through R1, and the rapid bleed off of the electrode resistance between Q1 emitter-base bandgap grading and base stage falls, and can not influence other functions of system.
Utilize above-mentioned reset circuit, after crashing appears in product, insert the charging inlet of product, just can make master chip reset rapidly with charger.Reset finish after, no matter be that charger is extracted or the insertion state does not influence other normal runnings of product.When using the reset circuit of this embodiment and having charger to insert, it is pointed out that when terminal is in off-mode, do not influence normal runnings such as its charging of carrying out, USB downloads; When this series products is in open state, above-mentioned reset circuit can carry out one to terminal restarts or power-off operation, but because generally can not carry out USB download, charging operations when start is used for portable consumer electronics products such as similar MP3, bluetooth earphones, therefore above-mentioned reset circuit does not influence the normal use of product.
In sum,, utilize portable consumer electronics product lithium cell charging interface, give an insertion charging action, reached the purpose of portable consumer electronics product being carried out active homing charging inlet by the foregoing description.With low cost, simple to operate, and do not increase the external interface of product itself, and then improved terminal appearance experience, cost is lower.
Obviously, those skilled in the art should be understood that, above-mentioned each step of the present utility model can realize with the general calculation device, in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the utility model is not restricted to any specific hardware and software combination.
The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (4)
1. a reset circuit is characterized in that, comprising: electric capacity, first resistance and NPN type triode, wherein,
One end of described electric capacity is connected on the power interface of charging paths, and the other end of described electric capacity is connected with described first resistance;
The other end of described first resistance is connected on the base stage of described triode;
The emitter grounding of described triode;
The collector electrode of described triode links to each other with the reset pin of main control chip, and the collector electrode of described triode keeps high level.
2. reset circuit according to claim 1, its feature also is, also comprises: second resistance, wherein, an end of described second resistance is connected with the collector electrode of described triode, and the other end keeps high level.
3. reset circuit according to claim 1 is characterized in that, is under the situation of 5V in the charging voltage of described charging paths, and described capacitance size is 1uF, and described first resistance is 50K ohm.
4. a terminal is characterized in that, comprises each described reset circuit in the claim 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205853262U CN201846323U (en) | 2010-10-29 | 2010-10-29 | Reset circuit and terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205853262U CN201846323U (en) | 2010-10-29 | 2010-10-29 | Reset circuit and terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201846323U true CN201846323U (en) | 2011-05-25 |
Family
ID=44041199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205853262U Expired - Lifetime CN201846323U (en) | 2010-10-29 | 2010-10-29 | Reset circuit and terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201846323U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102752880A (en) * | 2012-06-12 | 2012-10-24 | 洪涛 | Control device and control method for controlling standard universal serial bus (USB) interface wireless local area network (WLAN) card to restart |
| CN103825593A (en) * | 2014-03-18 | 2014-05-28 | 青岛歌尔声学科技有限公司 | Reset signal generating circuit and electronic equipment |
| CN107809696A (en) * | 2017-11-30 | 2018-03-16 | 成都必盛科技有限公司 | It is a kind of to establish the wireless headset interacted with Earphone box |
| CN107809697A (en) * | 2017-11-30 | 2018-03-16 | 成都必盛科技有限公司 | It is a kind of to be used to establish the Earphone box interacted with wireless headset |
| CN107947777A (en) * | 2017-11-20 | 2018-04-20 | 青岛海信宽带多媒体技术有限公司 | Reset circuit and optical module, the ONT Optical Network Terminal of optical module |
| CN108227886A (en) * | 2018-02-07 | 2018-06-29 | 湖南科技大学 | The reset circuit of SCM of microsystem product and microsystem product |
| CN108551338A (en) * | 2018-04-28 | 2018-09-18 | 歌尔科技有限公司 | A kind of reset circuit and portable electronic product |
| CN109194317A (en) * | 2018-09-05 | 2019-01-11 | 潍坊歌尔电子有限公司 | A kind of reset circuit and wearable device |
-
2010
- 2010-10-29 CN CN2010205853262U patent/CN201846323U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102752880A (en) * | 2012-06-12 | 2012-10-24 | 洪涛 | Control device and control method for controlling standard universal serial bus (USB) interface wireless local area network (WLAN) card to restart |
| CN103825593A (en) * | 2014-03-18 | 2014-05-28 | 青岛歌尔声学科技有限公司 | Reset signal generating circuit and electronic equipment |
| CN107947777A (en) * | 2017-11-20 | 2018-04-20 | 青岛海信宽带多媒体技术有限公司 | Reset circuit and optical module, the ONT Optical Network Terminal of optical module |
| CN107947777B (en) * | 2017-11-20 | 2021-06-22 | 青岛海信宽带多媒体技术有限公司 | Reset circuit of optical module, optical module and optical network terminal |
| CN107809696A (en) * | 2017-11-30 | 2018-03-16 | 成都必盛科技有限公司 | It is a kind of to establish the wireless headset interacted with Earphone box |
| CN107809697A (en) * | 2017-11-30 | 2018-03-16 | 成都必盛科技有限公司 | It is a kind of to be used to establish the Earphone box interacted with wireless headset |
| CN108227886A (en) * | 2018-02-07 | 2018-06-29 | 湖南科技大学 | The reset circuit of SCM of microsystem product and microsystem product |
| CN108551338A (en) * | 2018-04-28 | 2018-09-18 | 歌尔科技有限公司 | A kind of reset circuit and portable electronic product |
| CN109194317A (en) * | 2018-09-05 | 2019-01-11 | 潍坊歌尔电子有限公司 | A kind of reset circuit and wearable device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110525 |