CN205229961U - Anti breech lock power -off reset circuit of CMOS singlechip - Google Patents
Anti breech lock power -off reset circuit of CMOS singlechip Download PDFInfo
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- CN205229961U CN205229961U CN201520971392.6U CN201520971392U CN205229961U CN 205229961 U CN205229961 U CN 205229961U CN 201520971392 U CN201520971392 U CN 201520971392U CN 205229961 U CN205229961 U CN 205229961U
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Abstract
The utility model discloses an anti breech lock power -off reset circuit of CMOS singlechip, characterized by, including watchdog circuit unit, watchdog circuit unit's input links to each other with the pin that refreshes of CMOS singlechip, and termination time delay circuit unit's input is exported to restoring to the throne of watchdog circuit unit, and time delay circuit unit's output links to each other with the switch motion circuit, and the switch motion unit concatenates and is being used for the power cord for the singlechip power supply. The utility model discloses a circuit is simple, but can reach anti latched effect, and the practicality is strong, and the cost is low.
Description
Technical field
The utility model relates to the anti-breech lock technical field of CMOS single-chip microcomputer, particularly relates to a kind of CMOS single-chip microcomputer anti-breech lock power-off restoration circuit.
Background technology
After the single-chip microcomputer generation breech lock of CMOS technology, simply applying reset signal by common watchdog circuit to it is to make it exit latch mode.
After the single-chip microcomputer generation breech lock of CMOS technology, can only re-power could recover by power-off a period of time.Operate cumbersome, and if equipment be arranged on unattended place, after generation, cannot realize resetting at once, can not the normal work of support equipment.
Utility model content
For solving the deficiency that prior art exists, the utility model discloses a kind of CMOS single-chip microcomputer anti-breech lock power-off restoration circuit, this circuit had not only possessed watchdog function but also had possessed power-off and re-powered function.By the enforcement of this circuit, make CMOS single-chip microcomputer exit latch mode, recover normal operating conditions, ensured the safe and effective steady operation of equipment.
For achieving the above object, concrete scheme of the present utility model is as follows:
A kind of CMOS single-chip microcomputer anti-breech lock power-off restoration circuit, comprise watchdog circuit unit, the input end of described watchdog circuit unit is connected with the refreshing pin of CMOS single-chip microcomputer, the reset output terminal of watchdog circuit unit connects the input end of time delay circuit unit, the output terminal of time delay circuit unit is connected with switch motion circuit, and switch motion unit strings is connected on the power lead for powering to single-chip microcomputer.
Further, described watchdog circuit unit is responsible for the supervision of CMOS single-chip microcomputer breech lock, and time delay circuit unit is responsible for the pulse signal broadening of watchdog circuit unit output to time enough width, in order to gauge tap actuating circuit to the power-off of CMOS single-chip microcomputer; Switch motion unit strings is connected on power lead VCC, for realizing connection and the cut-out of VCC.
Further, described watchdog circuit unit comprises resistance R4 and watchdog chip U1, and watchdog chip U1 is connected with the pin of CMOS single-chip microcomputer by resistance R4, and the RESET pin of watchdog chip U1 is connected with time delay circuit unit.
Further, described time delay circuit unit comprises the metal-oxide-semiconductor Q2 be connected with the reset pin of watchdog chip U1, and metal-oxide-semiconductor Q2 is connected with power end by pull-up resistor R1, in parallel with metal-oxide-semiconductor Q2 after resistance R3 and electric capacity E1 is in series.
Further, described switch motion unit comprises diode D1, resistance R2, triode Q3 and metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2 is connected with triode Q3 by diode D1 with the common port of resistance R3, triode Q3 is connected with the resistance R2 be in parallel and metal-oxide-semiconductor Q1, and metal-oxide-semiconductor Q1 is connected to the supply pin of CMOS single-chip microcomputer.
Further, described resistance R3 is 5.1 ohm, and electric capacity E1 is 10 μ F, realizes CMOS single-chip microcomputer power-off 1.6S.
Further, when CMOS single-chip microcomputer normally works, signal WDI from single-chip microcomputer rushes signal normal second, the 3 pin RESET output low levels of watchdog chip U1, the metal-oxide-semiconductor Q2 not conducting of time delay circuit unit, the VCC of this unit is charged to electric capacity E1 by resistance R1 and resistance R3, when voltage exceedes the economize on electricity pressure of diode D1 and triode Q3, the triode Q3 conducting of switch motion unit, metal-oxide-semiconductor Q1 conducting, 5V power supply signal is supplied to CMOS single-chip microcomputer by metal-oxide-semiconductor Q1 output VCC signal and normally works.
Further, during CMOS single-chip microcomputer generation breech lock, from the WDI signal interruption of single-chip microcomputer, the 3 pin RESET of watchdog circuit unit U1 export the high level signal of a 200ms, the metal-oxide-semiconductor Q2 conducting of time delay circuit unit, the tie point of resistance R3 and metal-oxide-semiconductor Q2 is dragged down instantaneously, the time that drags down sets according to the requirement of CMOS single-chip microcomputer power-off restoration time, the low level signal that the tie point of resistance R3 and metal-oxide-semiconductor Q2 exports, make triode Q3 and the metal-oxide-semiconductor Q1 not conducting of follow-up switch motion unit, cut off VCC to power, realize forcing CMOS single-chip microcomputer to exit latch mode.
The beneficial effects of the utility model:
By enforcement of the present utility model, can realize when CMOS singlechip chip generation breech lock, anti-latch circuit can power on to after CMOS singlechip chip power-off a period of time again, makes it to exit latch mode, recover normal operating conditions, ensure the safe and effective steady operation of equipment.Avoid because equipment is arranged on unattended far-end, after there is breech lock, cisco unity malfunction, incurs loss through delay correctness, validity and the real-time of equipment institute monitoring information simultaneously.
Circuit of the present utility model is simple, and but can reach the effect of anti-breech lock, practical, cost is low.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present utility model;
Fig. 2 position circuit diagram of the present utility model.
Embodiment:
Below in conjunction with accompanying drawing, the utility model is described in detail:
As shown in Figure 1, a kind of anti-latch circuit based on current detecting comprises watchdog circuit unit, time delay circuit unit, switch motion unit.
Principle of work is: under CMOS technology single-chip microcomputer normal operating conditions, house dog refreshes pin can be under program, refresh signal is sent to house dog with certain cycle, when breech lock occurs CMOS, program stopped work, also just stops the refresh operation to house dog, and then cause WatchDog Timer to overflow, house dog can export reset signal, and reset signal driving switch actuating mechanism cuts off CMOS microcontroller power supply a period of time, then restores electricity.
Wherein the input of watchdog circuit unit connects the refreshing pin of CMOS single-chip microcomputer, and reset output connects time delay circuit unit.Watchdog circuit unit is responsible for the supervision of CMOS single-chip microcomputer breech lock;
Time delay circuit unit is responsible for the pulse signal broadening of watchdog circuit unit output to time enough width, in order to gauge tap actuating circuit to the power-off of CMOS single-chip microcomputer;
Switch motion unit strings is connected on power lead VCC, for realizing connection and the cut-out of VCC.Switch control unit is being in on-state at ordinary times, and when there is breech lock, the Pulse Width Control exported by delay circuit, realizes CMOS single-chip microcomputer power-off certain hour, then Power resumption.Thus realize forcing CMOS single-chip microcomputer to exit latch mode.
As shown in Figure 2, watchdog circuit unit comprises resistance R4 and chip U1.Watchdog chip U1 is connected with the pin of CMOS single-chip microcomputer by resistance R4, when CMOS single-chip microcomputer normally works, single-chip microcomputer timing provides WDI signal, and watchdog chip U1 is in normal operating conditions, the 3 pin RESET of U1 export high level, and RESET is connected with time delay circuit unit below.Time delay circuit unit comprises metal-oxide-semiconductor Q2, resistance R1 and resistance R3, electric capacity E1.Switch motion unit comprises diode D1, resistance R2, triode Q3 and metal-oxide-semiconductor Q1.
When CMOS single-chip microcomputer normally works, signal WDI from single-chip microcomputer rushes signal normal second, the 3 pin RESET output low levels of U1, the metal-oxide-semiconductor Q2 not conducting of time delay circuit unit, the VCC of this unit is charged to electric capacity E1 by resistance R1 and resistance R3, when voltage exceedes the economize on electricity pressure of diode D1 and triode Q3, and the triode Q3 conducting of switch motion unit, Q1 conducting, 5V power supply signal is supplied to CMOS single-chip microcomputer by metal-oxide-semiconductor Q1 output VCC signal and normally works.
When CMOS single-chip microcomputer generation breech lock, from the WDI signal interruption of single-chip microcomputer, the 3 pin RESET of watchdog circuit unit U1 export the high level signal of a 200ms, the Q2 conducting of time delay circuit unit, the tie point of resistance R3 and metal-oxide-semiconductor Q2 is dragged down instantaneously, drag down the time relevant with the value of resistance R3 month electric capacity E1, the requirement according to the CMOS single-chip microcomputer power-off restoration time can choose reasonable.The low level signal that the tie point of resistance R3 and metal-oxide-semiconductor Q2 exports, makes triode Q3 and the metal-oxide-semiconductor Q1 not conducting of follow-up switch motion unit, cuts off VCC and powers, thus realizes forcing CMOS single-chip microcomputer to exit latch mode.
The pulse signal that the 3 pin RESET of watchdog circuit unit U1 export is 200ms, 200ms i.e. output low level later, returns to logic state when above-mentioned CMOS single-chip microcomputer normally works, thus achieves CMOS single-chip microcomputer and again power.
In practical application, we select resistance R3 to be 5.1 ohm, and electric capacity E1 is 10 μ F, achieve the design of CMOS single-chip microcomputer power-off 1.6S, fully meet the design that latch mode is exited in the power-off of CMOS single-chip microcomputer.
By reference to the accompanying drawings embodiment of the present utility model is described although above-mentioned; but the restriction not to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection domain of the present utility model.
Claims (8)
1. a CMOS single-chip microcomputer anti-breech lock power-off restoration circuit, it is characterized in that, comprise watchdog circuit unit, the input end of described watchdog circuit unit is connected with the refreshing pin of CMOS single-chip microcomputer, the reset output terminal of watchdog circuit unit connects the input end of time delay circuit unit, the output terminal of time delay circuit unit is connected with switch motion circuit, and switch motion unit strings is connected on the power lead for powering to single-chip microcomputer.
2. a kind of CMOS single-chip microcomputer as claimed in claim 1 anti-breech lock power-off restoration circuit, it is characterized in that, described watchdog circuit unit is responsible for the supervision of CMOS single-chip microcomputer breech lock, time delay circuit unit is responsible for the pulse signal broadening of watchdog circuit unit output to time enough width, in order to gauge tap actuating circuit to the power-off of CMOS single-chip microcomputer; Switch motion unit strings is connected on power lead VCC, for realizing connection and the cut-out of VCC.
3. a kind of CMOS single-chip microcomputer as claimed in claim 1 anti-breech lock power-off restoration circuit, it is characterized in that, described watchdog circuit unit comprises resistance R4 and watchdog chip U1, watchdog chip U1 is connected with the pin of CMOS single-chip microcomputer by resistance R4, and the RESET pin of watchdog chip U1 is connected with time delay circuit unit.
4. a kind of CMOS single-chip microcomputer as claimed in claim 1 anti-breech lock power-off restoration circuit, it is characterized in that, described time delay circuit unit comprises the metal-oxide-semiconductor Q2 be connected with the reset pin of watchdog chip U1, metal-oxide-semiconductor Q2 is connected with power end by pull-up resistor R1, in parallel with metal-oxide-semiconductor Q2 after resistance R3 and electric capacity E1 is in series.
5. a kind of CMOS single-chip microcomputer as claimed in claim 1 anti-breech lock power-off restoration circuit, it is characterized in that, described switch motion unit comprises diode D1, resistance R2, triode Q3 and metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2 is connected with triode Q3 by diode D1 with the common port of resistance R3, and triode Q3 is connected with the resistance R2 be in parallel and metal-oxide-semiconductor Q1, and metal-oxide-semiconductor Q1 is connected to the supply pin of CMOS single-chip microcomputer.
6. a kind of CMOS single-chip microcomputer as claimed in claim 4 anti-breech lock power-off restoration circuit, is characterized in that, described resistance R3 is 5.1 ohm, and electric capacity E1 is 10 μ F, realizes CMOS single-chip microcomputer power-off 1.6S.
7. a kind of CMOS single-chip microcomputer as claimed in claim 5 anti-breech lock power-off restoration circuit, it is characterized in that, when CMOS single-chip microcomputer normally works, signal WDI from single-chip microcomputer rushes signal normal second, the 3 pin RESET output low levels of watchdog chip U1, the metal-oxide-semiconductor Q2 not conducting of time delay circuit unit, the VCC of this unit is charged to electric capacity E1 by resistance R1 and resistance R3, when voltage exceedes the economize on electricity pressure of diode D1 and triode Q3, the triode Q3 conducting of switch motion unit, metal-oxide-semiconductor Q1 conducting, 5V power supply signal is supplied to CMOS single-chip microcomputer by metal-oxide-semiconductor Q1 output VCC signal and normally works.
8. a kind of CMOS single-chip microcomputer as claimed in claim 5 anti-breech lock power-off restoration circuit, it is characterized in that, during CMOS single-chip microcomputer generation breech lock, from the WDI signal interruption of single-chip microcomputer, the 3 pin RESET of watchdog circuit unit U1 export the high level signal of a 200ms, the metal-oxide-semiconductor Q2 conducting of time delay circuit unit, the tie point of resistance R3 and metal-oxide-semiconductor Q2 is dragged down instantaneously, the time that drags down sets according to the requirement of CMOS single-chip microcomputer power-off restoration time, the low level signal that the tie point of resistance R3 and metal-oxide-semiconductor Q2 exports, make triode Q3 and the metal-oxide-semiconductor Q1 not conducting of follow-up switch motion unit, cut off VCC to power, realize forcing CMOS single-chip microcomputer to exit latch mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520971392.6U CN205229961U (en) | 2015-11-30 | 2015-11-30 | Anti breech lock power -off reset circuit of CMOS singlechip |
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| CN201520971392.6U CN205229961U (en) | 2015-11-30 | 2015-11-30 | Anti breech lock power -off reset circuit of CMOS singlechip |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106374896A (en) * | 2016-11-04 | 2017-02-01 | 盛科网络（苏州）有限公司 | Power off reset system |
| CN106656324A (en) * | 2017-02-16 | 2017-05-10 | 深圳市菲菱科思通信技术股份有限公司 | ONU optical module long luminescence detection device and method based on current |
| CN108445819A (en) * | 2018-05-25 | 2018-08-24 | 无锡职业技术学院 | A kind of anti-latch-up SCM system |
| WO2019227838A1 (en) * | 2018-05-31 | 2019-12-05 | 郑州云海信息技术有限公司 | Chip power-on reset circuit |
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2015
- 2015-11-30 CN CN201520971392.6U patent/CN205229961U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106374896A (en) * | 2016-11-04 | 2017-02-01 | 盛科网络（苏州）有限公司 | Power off reset system |
| CN106374896B (en) * | 2016-11-04 | 2019-05-31 | 盛科网络（苏州）有限公司 | Power-out reset system |
| CN106656324A (en) * | 2017-02-16 | 2017-05-10 | 深圳市菲菱科思通信技术股份有限公司 | ONU optical module long luminescence detection device and method based on current |
| CN106656324B (en) * | 2017-02-16 | 2019-11-08 | 深圳市菲菱科思通信技术股份有限公司 | The long luminescence detection apparatus of ONU optical module and method based on electric current |
| CN108445819A (en) * | 2018-05-25 | 2018-08-24 | 无锡职业技术学院 | A kind of anti-latch-up SCM system |
| WO2019223762A1 (en) * | 2018-05-25 | 2019-11-28 | 无锡职业技术学院 | Anti-latch-up single-chip computer system |
| US11630430B2 (en) | 2018-05-25 | 2023-04-18 | Wuxi Institute Of Technology | Latchup immune microcontroller system |
| WO2019227838A1 (en) * | 2018-05-31 | 2019-12-05 | 郑州云海信息技术有限公司 | Chip power-on reset circuit |
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Address after: 250101 A203, block F, entrepreneurship square, Qilu Software Park, No.1 Shunhua Road, high tech Development Zone, Jinan City, Shandong Province Patentee after: Conway Communication Technology Co., Ltd Address before: 250101 Qilu Software Park, No. 1 Shunhua Road, Jinan High-tech Development Zone, Shandong Province, A 203 Patentee before: SHANDONG KANGWEI COMMUNICATION TECHNOLOGY Co.,Ltd. |