CN2703362Y - Reliable top electrical resetting apparatus - Google Patents
Reliable top electrical resetting apparatus Download PDFInfo
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- CN2703362Y CN2703362Y CN 200320112065 CN200320112065U CN2703362Y CN 2703362 Y CN2703362 Y CN 2703362Y CN 200320112065 CN200320112065 CN 200320112065 CN 200320112065 U CN200320112065 U CN 200320112065U CN 2703362 Y CN2703362 Y CN 2703362Y
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- isolating
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- circuit board
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Abstract
The utility model provides a reliable power supplying resetting device, comprising a delay circuit, an isolation driver, a controllable isolation driver, a watchdog chip and a pull up resistor. The reliable top electrical resetting device is characterized in that the output terminal of the delay circuit is connected with the input terminal of the isolation driver, the output terminal of the delay circuit becomes a standard logic electrical level after passing through the isolation driver, and the output terminal of the delay circuit is sent to the control terminal of the controllable isolation driver; the output terminal of the watchdog chip is connected with the input terminal of the controllable isolation driver, and the output terminal of the controllable isolation driver is connected with the pull up resistor and the resetting legs of chips on a power supplying resetting circuit board. The delay circuit and the controllable isolation driver are utilized on the circuit board of the reliable top electrical resetting device, the circuit board is ensured that the chips are reset after power supply voltage reaches standard working voltage when the circuit board is supplied with power, the reliability and the success ratio in power supplying process are increased, and the power supplying process of the circuit board is simplified.
Description
Technical field
The present invention relates to the electrification reset technology, relate in particular to a kind of a kind of reliable electrification reset device of circuit board that supply power voltage is had the chip of requirement that used when resetting in the communication field.
Background technology
At communication field,, need on circuit board, place watchdog chip for guaranteeing the circuit board reliability service.When circuit board powers on, provide reset signal for other chip on the circuit board by watchdog chip.The normally used electrify restoration circuit of industry comprises watchdog chip 101, pull-up resistor 103 and driver for isolating 102 as shown in Figure 1, and wherein watchdog chip 101 is used to export reset pulse; A pull-up resistor 103 that is provided with on the reseting pin of each chip is used to guarantee that each chip on the circuit board is not because of being subjected to various interference mistakes to enter reset mode.In addition, adopt the reset signal of 102 pairs 101 outputs of driver for isolating to carry out isolation drive, the limited problem of reset signal output pin driving force with reply watchdog chip 101, simultaneously, if the circuit chip on board is more, then can be by driver for isolating 102 output multichannel reset signals, so just can be simultaneously to the reset operation that carries out of each chip on the circuit board.Fig. 2 is the embodiment of conventional electrification reset device.
In the above mentioned electrify restoration circuit, can reliably working for guaranteeing watchdog chip 101 and driver for isolating 102, need satisfy chip required standard operating voltage VCC for they provide.In the practical application, (less than standard operation voltage) just can activate watchdog chip 101 and driver for isolating 102 when supply power voltage reached certain level threshold values.
Generally, the activation voltage V1 of watchdog chip 101 is less than 102 activation voltage V2, and after driver for isolating 102 was activated, the signal that watchdog chip 101 is provided outputed to the resetting pin of each chip.When circuit board powered on, supply power voltage at first reached the activation voltage V1 of watchdog chip 101, and this moment, watchdog chip 101 began to export reseting pulse signal (effectively low).Along with the rising of supply power voltage, behind the activation voltage V2 that reaches driver for isolating 102, this driver for isolating 102 begins the reset signal that watchdog chip 101 provides is outputed to the reseting pin of each chip, and chip enters reset mode.But this moment, circuit board supply power voltage V2 did not also reach chip required standard operating voltage VCC, used when resetting the chip (standard operation voltage VCC chip that could correct configuration status register need be provided during with the chip of determining operating state or at reset mode as the level that need read configuration pin when the reset mode) that supply power voltage is had requirement on the ifs circuit plate, then may produce configuration error, thereby cause this chip can not enter correct operating state.In this case, just need after finishing, the circuit board power up, finish initial configuration work to each chip of circuit board by the hand-reset operation.
Hence one can see that, and conventional reset circuit as shown in Figure 1 when powering on, can not reach the effect of chip being carried out reliable reset to some circuit board.
Summary of the invention
The purpose of this utility model is just in order to overcome the shortcoming that has entered reset mode in circuit board power up chips when supply power voltage does not also reach standard operation voltage in the prior art, thereby provide a kind of reliable electrification reset device, under the prerequisite of the normal reset operation that does not influence veneer, solved the problem that the circuit board chips is realized reliable electrification reset.
A kind of reliable electrification reset device that the utility model proposed comprises delay circuit, driver for isolating, controlled driver for isolating, watchdog chip and pull-up resistor composition, wherein:
Delay circuit is used for delaying the variation at the input signal of circuit board power up driver for isolating;
Driver for isolating is used to isolate the output signal of delay circuit and the control end signal of the driver for isolating of band control end;
Controlled driver for isolating drives the signal that watchdog chip provides under state of activation, and described signal is exported to each chip on the circuit board;
Watchdog chip is used for having the low level reset signal in the output of circuit board power up;
Pull-up resistor is used to that each chip reset pin provides high level on the circuit board;
The input of the described driver for isolating of output termination of described delay circuit, and behind described driver for isolating, become the standard logic level, and deliver to the control end of described controlled driver for isolating, the input of the described controlled driver for isolating of output termination of described watchdog chip, the resetting pin of each chip on described controlled driver for isolating output described pull-up resistor of termination and the described electrify restoration circuit plate.
Adopt reliable electrification reset device described in the utility model, compared with prior art, overcome the shortcoming that chip had entered reset mode when supply voltage did not also reach standard operation voltage in the circuit board power up in the prior art, on circuit board, utilize delay circuit and controlled driver for isolating, just begin each chip is carried out reset operation after supply power voltage reaches standard operation voltage when guaranteeing that circuit board powers on, reached the effect that can enter correct operating state after circuit board electrification reset process is finished, also need to come the problem of initialization chip once more after having avoided the circuit board power up to finish, improved the reliability of the handling process that powers on of circuit board by extra reset operation.
Be elaborated below in conjunction with embodiment and with reference to the technical scheme of accompanying drawing to this invention.
Description of drawings
Fig. 1 is an electrification reset apparatus structure block diagram in the prior art;
Fig. 2 is the circuit connection diagram of electrification reset device in the prior art;
Fig. 3 is a reliable electrification reset apparatus structure block diagram of the present utility model;
Fig. 4 is the circuit connection diagram of reliable electrification reset device of the present utility model;
Fig. 5 is the output signal sequential chart of circuit that prior art adopts;
Fig. 6 is a reliable electrify restoration circuit output signal sequential chart of the present utility model.
Embodiment
Conventional electrification reset device as shown in Figure 1, its course of work is: the output signal of watchdog chip 101 is input to the input of driver for isolating 102, after driver for isolating 102 activated, just the signal that watchdog chip 101 is provided outputed to the resetting pin (each chip reset pin all has corresponding pull-up resistor) of each chip.The timing variations of each output signal as shown in Figure 5 when this circuit board powered on.Wherein, the variation of supply voltage is shown in the curve 5a among Fig. 5, and the circuit board supply voltage reaches standard operation voltage VCC during T3; (the veneer supply power voltage reaches the activation voltage V1 of watchdog chip 101 (V1＜VCC), this chip output reset signal also stops to export reset signal when T4, and output reset signal timing variations is shown in the curve b among Fig. 5 T1 during T1＜T3); (the veneer supply power voltage reaches the activation voltage V2 (V1＜V2＜VCC) of driver for isolating 102 to T2 during T1＜T2＜T3), after this reseting pulse signal that just house dog 101 provided of driver for isolating 102 outputs to each chip reset pin, so the timing variations of the reset signal that receives of each chip is shown in the curve c among Fig. 5.
This shows, for conventional electrification reset device, when its supply power voltage does not also reach standard operation voltage VCC on the circuit board each chip entered reset mode.Need provide when the reset mode chip that standard operation voltage VCC could correct configuration status register configuration error to occur for some in the next meeting of this supply power voltage state.
Reliable electrification reset device described in the utility model is after circuit board voltage reaches standard operation voltage VCC, the reset signal that watchdog chip is provided outputs to each chip on the circuit board, thereby guaranteed the correctness of chip configuration, made circuit board after the electrification reset process is finished, promptly enter correct operating state and need not extra hand-reset operation.
As shown in Figure 3, be the device of reliable electrification reset described in the utility model, it is made up of delay circuit 301, driver for isolating 302, controlled driver for isolating 303, watchdog chip 304 and pull-up resistor 305, wherein:
Delay circuit 301 is used for delaying the variation at the input signal of circuit board power up driver for isolating 302, promptly by certain time-delay, guarantees that circuit is reaching the high triggering level that the signal of exporting behind the standard operation voltage reaches the driver for isolating input;
Driver for isolating 302 is used for isolating the output signal of delay circuit 301 and the control end signal of controlled driver for isolating 303, thereby the gradual change signal of delay circuit 301 outputs is become the logic level signal of standard.Why use driver for isolating 302 in the present invention, be because for controlled driver for isolating 303, the signal of its control end must be the logic level signal of standard, and the signal of being exported by delay circuit 301 is the analog signal of a gradual change, if it directly links to each other with the control end of controlled driver for isolating 303, can produce the erroneous judgement break signal, therefore use device 302 to guarantee the reliable operation of device 303.Wherein, driver for isolating 302 can be selected the industry special chip for use;
Controlled driver for isolating 303, its signal that can under state of activation watchdog chip 304 be provided is exported to each chip after driving.When control end input signal invalid (logic low), controlled driver for isolating 303 is in non-activated state, can not drive the signal that watchdog chip 304 provides, and output is a high resistant; When the control end input signal effectively when (logic high) controlled driver for isolating 303 be in activated state, identical with the driver for isolating function of prior art, export to each chip after the signal that watchdog chip 304 is provided drives.This controlled driver for isolating 303 is a control end high level active parts, can select the industry special chip for use or use programmable logic device (EPLD) to realize;
Watchdog chip 304 is used for having the low level reset signal of certain width in the output of circuit board power up, can select the industry special chip for use.
Pull-up resistor 305 is used for when the circuit board operate as normal, and for each chip reset pin provides high level, She Ji purpose is to prevent that each chip from entering reset mode because of the interference mistake like this.Equally, it also can select the general resistance of industry for use.
The input of the output termination driver for isolating 302 of delay circuit 301, and after driver for isolating 302 isolation drive, become the standard logic level and deliver to the control end of controlled driver for isolating 303, the input of the controlled driver for isolating 303 of output termination of watchdog chip 304, the output of controlled driver for isolating 303 connects the resetting pin that draws each chip on resistance and the electrify restoration circuit plate.
The course of work of reliable electrify restoration circuit provided by the utility model is: circuit board powers on, when supply power voltage reaches the activation voltage V1 of watchdog chip 304, this chip begins to export reset signal, the output signal of delay circuit 301 does not reach the high triggering level V3 of driver for isolating 302 inputs at this moment, for the input of driver for isolating 302, be low triggering level, so driver for isolating 302 output low level signals, the control end of controlled driver for isolating 303 is invalid, output is high resistant signal (, each chip reset pin is high level by drawing on the pull-up resistor 305).Through the suitable time-delay of delay circuit 301, after the circuit board supply power voltage reaches standard operation voltage VCC, just reach the high triggering level V3 of the input of driver for isolating 302 from the output signal of delay circuit 301, after this, driver for isolating 302 output high level signals, make the control end continuously effective of controlled driver for isolating 303, controlled driver for isolating 303 enters activated state and keeps this state, the resetting pin of each chip on the circuit board that the reset signal that watchdog chip 304 is provided outputs to.
As shown in Figure 4, it is the circuit connection diagram of reliable electrification reset device of the present utility model, understand technical scheme of the present invention specifically: the output signal of reliable electrification reset device delay circuit connects the input of driver for isolating, the output that the control end of delivering to controlled driver for isolating after the driver for isolating isolation drive is used to control its operating state watchdog chip connects the input of controlled driver for isolating, and the output of controlled driver for isolating is connected to the resetting pin (each chip reset pin all has corresponding pull-up resistor) of each chip of circuit board.The signal logic decision level of the input of driver for isolating is that (V3＜VCC) just is judged as logic high, otherwise is judged as logic low V3 when the signal level of the input of driver for isolating is higher than V3.
Wherein, driver for isolating, controlled driver for isolating, watchdog chip can be selected each standard specialty chip as shown in Figure 4 respectively, also can select other chip or the circuit of equivalence.
The variation of supply voltage was shown in the curve d among Fig. 6 when the circuit board of electrify restoration circuit provided by the utility model powered on, and the circuit board supply voltage reaches standard operation voltage VCC during T3; The output reset signal sequential chart of watchdog chip 304 is shown in the curve e among Fig. 6, (the veneer supply power voltage reaches the activation voltage V1 of watchdog chip 304 (V1＜VCC), this chip begins to export reset signal and (stop to export reset signal during T4＞T3) at T4 during T1＜T3) at T1; The output signal sequential chart of delay circuit 301 and driver for isolating 302 is respectively shown in curve f and curve g among Fig. 6, wherein, delay circuit 301 is in charged state always, (T3＜T5＜T4) output signal level of delay circuit 301 before is lower than V3 (V3＜VCC) at T5, driver for isolating 302 is output low level always, the output signal electricity of delay circuit 301 reaches V3 when T5, and driver for isolating 302 begins to export high level; The output signal sequential chart of controlled driver for isolating 303 is shown in the curve h of Fig. 6, this output signal in fact also is the received reset signal of each chip, because T5＞T3, therefore when driver for isolating begins to export high level supply power voltage complete stability on standard operation voltage VCC, simultaneously, when driver for isolating 302 output high level, the control end signal that means controlled driver for isolating 303 is effective, controlled driver for isolating 303 is activated behind the T3, and the reseting pulse signal that watchdog chip 304 provides is outputed to the resetting pin of each chip.This shows that adopt electrification reset device shown in Figure 4, after supply voltage reached standard operation voltage VCC, each chip just entered reset mode.Because this moment, the supply power voltage of each chip satisfied the chip requirement, the logic determines of mistake can not occur and caused configuration error, had guaranteed the reliability service of circuit board.
By curve g shown in Figure 6 as can be known, when circuit board power on finish enter normal operating state after, the control end of controlled driver for isolating can keep high level always, so just can keep state of activation always, finishes identical with the driver for isolating function in the conventional electrify restoration circuit.
Therefore, reliable electrification reset device provided by the utility model only plays corrective action in circuit board electrification reset process, to other reset function behind the normal working of single board without any influence.
This shows,,, can guarantee that supply power voltage when circuit board powers on reaches the reset operation that just begins behind the standard operation voltage each chip by choose reasonable delay parameter and driver for isolating if adopt device shown in Figure 3.The situation that the logic determines mistake therefore can not occur has guaranteed the correctness of configuration, has simplified the circuit board handling process that powers on, and has improved the reliability of the handling process that powers on of circuit board.In addition, this device only plays corrective action in circuit board electrification reset process, to other reset function behind the normal working of single board without any influence.
Although the utility model discloses a kind of reliable electrification reset device by embodiment,, more than all purpose of description be the explanation the present invention rather than the restriction the present invention, protection scope of the present invention is as the criterion with claim.Under the situation that does not break away from the spirit and scope of the present invention; those skilled in the art all should drop within protection scope of the present invention its all conspicuous modification or variation about form and details of carrying out under the situation that does not depart from scope and spirit of the present invention.
Claims (9)
1. a reliable electrification reset device comprises delay circuit, driver for isolating, controlled driver for isolating, watchdog chip and pull-up resistor, it is characterized in that:
Delay circuit is used for delaying the variation at the input signal of circuit board power up driver for isolating;
Driver for isolating is used to isolate the output signal of delay circuit and the control end signal of the driver for isolating of band control end;
Controlled driver for isolating drives the signal that watchdog chip provides under state of activation, and described signal is exported to each chip on the circuit board;
Watchdog chip is used for having the low level reset signal in the output of circuit board power up;
Pull-up resistor is used to that each chip reset pin provides high level on the circuit board;
The input of the described driver for isolating of output termination of described delay circuit, and behind described driver for isolating, become the standard logic level, and deliver to the control end of described controlled driver for isolating, the input of the described controlled driver for isolating of output termination of described watchdog chip, the resetting pin of each chip on described controlled driver for isolating output described pull-up resistor of termination and the described electrify restoration circuit plate.
2. reliable electrification reset device as claimed in claim 1 is characterized in that, the signal that this controlled driver for isolating provides watchdog chip under state of activation is exported to each chip on the circuit board after driving.
3. reliable electrification reset device as claimed in claim 2 is characterized in that this controlled driver for isolating is the effective chip of control end high level, and this device entered unactivated state when control end was low level, the output high resistant; When control end was high level, described controlled driver for isolating entered state of activation.
4. reliable electrification reset device as claimed in claim 1 is characterized in that, this watchdog chip is each chip output low level reseting pulse signal on the circuit board.
5. reliable electrification reset device as claimed in claim 4 is characterized in that, this watchdog chip adopts the MAX706TESA special chip.
6. reliable electrification reset device as claimed in claim 1 is characterized in that, this driver for isolating becomes the gradual change signal of delay circuit output the control end signal of delivering to controlled driver for isolating behind the logic level signal of standard.
7. reliable electrification reset device as claimed in claim 6 is characterized in that, this driver for isolating adopts the 74LPT244 special chip.
8. reliable electrification reset device as claimed in claim 1 is characterized in that this delay circuit is the RC charging circuit, is used for delaying the variation at the input signal of circuit board power up driver for isolating.
9. reliable electrification reset device as claimed in claim 1 is characterized in that, guarantees that by pull-up resistor the reseting pin of each chip is a high level when this controlled driver for isolating is exported high resistant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320112065 CN2703362Y (en) | 2003-10-29 | 2003-10-29 | Reliable top electrical resetting apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320112065 CN2703362Y (en) | 2003-10-29 | 2003-10-29 | Reliable top electrical resetting apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN2703362Y true CN2703362Y (en) | 2005-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320112065 Expired - Lifetime CN2703362Y (en) | 2003-10-29 | 2003-10-29 | Reliable top electrical resetting apparatus |
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| CN (1) | CN2703362Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101281414B (en) * | 2007-04-07 | 2012-04-18 | 深圳迈瑞生物医疗电子股份有限公司 | Controllable watchdog replacement system |
| CN102711312A (en) * | 2011-03-28 | 2012-10-03 | 海洋王照明科技股份有限公司 | Multi-power module electrification control method and system |
| CN102907002A (en) * | 2010-03-26 | 2013-01-30 | 桑迪士克科技股份有限公司 | Apparatus and method for host power-on reset control |
| CN103647535A (en) * | 2013-12-10 | 2014-03-19 | 青岛歌尔声学科技有限公司 | RC reset circuit with power supply inspection and control function |
| CN107273239A (en) * | 2017-07-03 | 2017-10-20 | 郑州云海信息技术有限公司 | A kind of protection system of startup of server code and guard method |
| CN108306629A (en) * | 2018-02-27 | 2018-07-20 | 上海康斐信息技术有限公司 | A kind of synchronous reset device of difference reset level |
| CN111506178A (en) * | 2020-06-16 | 2020-08-07 | 深圳市芯天下技术有限公司 | Chip power-on reset method and chip |
-
2003
- 2003-10-29 CN CN 200320112065 patent/CN2703362Y/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101281414B (en) * | 2007-04-07 | 2012-04-18 | 深圳迈瑞生物医疗电子股份有限公司 | Controllable watchdog replacement system |
| CN102907002A (en) * | 2010-03-26 | 2013-01-30 | 桑迪士克科技股份有限公司 | Apparatus and method for host power-on reset control |
| CN102907002B (en) * | 2010-03-26 | 2015-11-25 | 桑迪士克科技股份有限公司 | For the apparatus and method that host power-on reset controls |
| CN102711312A (en) * | 2011-03-28 | 2012-10-03 | 海洋王照明科技股份有限公司 | Multi-power module electrification control method and system |
| CN103647535A (en) * | 2013-12-10 | 2014-03-19 | 青岛歌尔声学科技有限公司 | RC reset circuit with power supply inspection and control function |
| CN107273239A (en) * | 2017-07-03 | 2017-10-20 | 郑州云海信息技术有限公司 | A kind of protection system of startup of server code and guard method |
| CN107273239B (en) * | 2017-07-03 | 2021-01-15 | 苏州浪潮智能科技有限公司 | Protection system and protection method for server boot code |
| CN108306629A (en) * | 2018-02-27 | 2018-07-20 | 上海康斐信息技术有限公司 | A kind of synchronous reset device of difference reset level |
| CN111506178A (en) * | 2020-06-16 | 2020-08-07 | 深圳市芯天下技术有限公司 | Chip power-on reset method and chip |
| CN111506178B (en) * | 2020-06-16 | 2020-10-23 | 深圳市芯天下技术有限公司 | Chip power-on reset method and chip |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20131029 Granted publication date: 20050601 |