CN201226204Y - Watchdog based on two singlechips and circuit for monitoring voltage - Google Patents
Watchdog based on two singlechips and circuit for monitoring voltage Download PDFInfo
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- CN201226204Y CN201226204Y CN 200820108859 CN200820108859U CN201226204Y CN 201226204 Y CN201226204 Y CN 201226204Y CN 200820108859 CN200820108859 CN 200820108859 CN 200820108859 U CN200820108859 U CN 200820108859U CN 201226204 Y CN201226204 Y CN 201226204Y
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- voltage monitoring
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- watchdog
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Abstract
The utility model relates to a watchdog and voltage monitoring circuit based on double singlechips, which belongs to the field of instrument and meter. The watchdog and voltage monitoring circuit comprises a first singlechip, a second singlechip, a display circuit, a keyboard circuit, a digital regulation resistance chip and a watchdog and voltage monitoring chip; wherein, the first singlechip is connected with the second singlechip by serial communication; the input ends of the display circuit, the keyboard circuit and the digital regulation resistance chip are connected with the first singlechip; and the sliding ends of the digital regulation resistance chip are connected with the watchdog and voltage monitoring chip which is also respectively connected with the first and the second singlechips. The watchdog and voltage monitoring circuit can simulate the various operational environments of the watchdog and voltage monitoring chip, thus providing convenience for an in-depth appreciation for the watchdog and voltage monitoring chip.
Description
Technical field
A kind of house dog and voltage monitoring circuit based on double mcu belong to instrument field.
Background technology
At present, student's design in colleges and universities' electricity class specialty contains in the process of house dog and voltage monitoring chip controls circuit, the understanding of house dog and voltage monitoring chip is confined on the parameter and classical circuit that production firm provides mostly, deeper understanding does not have, this design that has limited house dog and voltage monitoring chip is used, this is that the problem that exists is gone up in house dog and the use at present of voltage monitoring chip, and functions of use and scope how more in depth to excavate house dog and voltage monitoring chip are the problems that needs solution at present.
The utility model content
The utility model provides a kind of house dog and voltage monitoring circuit based on double mcu, by this circuit, the understanding house dog that can be more deep and the performance of voltage monitoring chip provide the instrument of training and understanding house dog and voltage monitoring chip for the student of colleges and universities electricity class specialty.
For achieving the above object, the utility model has been taked following technical scheme.This supervisory circuit comprises first single-chip microcomputer, second singlechip, display circuit, keyboard circuit, digital regulation resistance chip, house dog and voltage monitoring chip.Wherein: connect by serial communication mode between first single-chip microcomputer and the second singlechip; The input end of display circuit, keyboard circuit and digital regulation resistance chip links to each other with first single-chip microcomputer, and the sliding end of digital regulation resistance chip links to each other with voltage monitoring with house dog, and house dog also links to each other with first single-chip microcomputer with second singlechip respectively with voltage monitoring.
The digital regulation resistance chip includes a plurality of digital regulation resistances, and the sliding end of one of them digital regulation resistance connects the positive power source terminal of house dog and voltage monitoring chip, and the sliding end of another digital regulation resistance connects house dog and voltage monitoring chip voltage monitoring input end.
The utility model connects the positive power source terminal and the voltage monitoring input end of house dog and voltage monitoring chip with the sliding end of digital regulation resistance, its advantage is just can simulate various house dogs and the required applied environment of voltage monitoring chip with the first Single-chip Controlling digital regulation resistance sliding end, second singlechip just can be experienced this environment, thereby can be observed the variation of single-chip microcomputer in this environment, raising is to the understanding of house dog and voltage monitoring chip, for the design application provides the reinforcement support.
Description of drawings
Fig. 1 circuit block diagram of the present utility model
Fig. 2 circuit theory diagrams of the present utility model
Embodiment
Be elaborated below in conjunction with 1～2 pair of the utility model of accompanying drawing.
Based on the house dog of double mcu and voltage monitoring circuit block diagram as shown in Figure 1, first single-chip microcomputer passes through I
2C interface and digital regulation resistance chip carry out exchanges data, adjust the sliding end of digital regulation resistance chip with this, the sliding end of digital regulation resistance chip (including a plurality of) connects the positive power source terminal and the voltage prison input control end of house dog and voltage monitoring chip, the output of house dog and voltage monitoring chip is except that second singlechip be used to reset second singlechip and providing the Power Supply Monitoring signal is provided, be also connected to first single-chip microcomputer, its objective is the output state that to monitor house dog and voltage monitoring chip; The feeding-dog signal of house dog and voltage monitoring chip is provided by first single-chip microcomputer; First single-chip microcomputer is connected by serial communication mode with second singlechip, and both sides understand its duty by serial communication.The display circuit that first single-chip microcomputer connects can be used for the duty of display digit potentiometer chip, house dog and voltage monitoring chip and second singlechip; The keyboard circuit that first single-chip microcomputer connects can be used for importing contemplated duty or working environment.
Concrete connecting circuit of the present utility model as shown in Figure 2.Two single-chip microcomputers all adopt the 89C52 of MCS-51 series, digital regulation resistance adopts the X9241U (including 4 digital regulation resistances) of U.S. XICOR company, house dog and voltage monitoring chip adopt the MAX706P of U.S. MAXIM company, and what display circuit in the present embodiment and keyboard circuit all adopted is custom circuit.
In Fig. 2,89C52-1 is connected with 9 pin with 14 pin of X9241U respectively with the P11 pin by P10, carries out exchanges data; 1 pin and 6 pin of X9241U are sliding ends of digital regulation resistance, are connected respectively to 4 pin (positive power source terminal) and 5 pin (power fail voltage monitoring input end) of MAX706P, for MAX706P provides different supply voltages; Other pin of X9241U all belongs to conventional connection; 1 pin of MAX706P is a high level reset signal output terminal, is directly connected to the reset terminal of 89C52-2, can be to the 89C52-2 control that resets; 7 pin of MAX706P are the power fail output terminal, and when monitoring voltage (the 5 pin voltages of MAX706P) during less than 1.25V, 7 pin can output low level, and this pin is connected to the outer interrupting input end INT0 (12 pin) of 89C52-2; The P12 pin of 89C52-1 connects 8 pin of MAX706P, forms the feeding-dog signal of 89C52-1 to MAX706P, and the timing of the inside WatchDog Timer of MAX706P is 1.6S; 1 pin of MAX706P and 7 pin also connect P13 and the P14 pin of 89C52-1 except that being connected 89C52-2, its objective is the output state into monitoring MAX706P; The K switch that connects MAX706P is used for hand-reset, and when K closed, 3 pin of MAX706P were set to low level, and 1 pin becomes high level immediately, and behind the time-delay 200ms, 89C52-2 is reset; Cause 4.4V when following when the power supply voltage (4 pin) of MAX706P falls, its builtin voltage comparer makes 1 pin output high level, produces the signal that 89C52-2 is resetted, and rises to normal value up to 4 pin supply voltages.How 89C52-1 regulates the position of the sliding end of X9241U, can consult the detailed description of X9241U.
Claims (1)
1, a kind of house dog and voltage monitoring circuit based on double mcu is characterized in that: comprise first single-chip microcomputer, second singlechip, display circuit, keyboard circuit, digital regulation resistance chip, house dog and voltage monitoring; Wherein: connect by serial communication mode between first single-chip microcomputer and the second singlechip; The input end of display circuit, keyboard circuit and digital regulation resistance chip links to each other with first single-chip microcomputer, and the sliding end of digital regulation resistance chip links to each other with voltage monitoring with house dog, and house dog also links to each other with first single-chip microcomputer with second singlechip respectively with voltage monitoring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200820108859 CN201226204Y (en) | 2008-06-27 | 2008-06-27 | Watchdog based on two singlechips and circuit for monitoring voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200820108859 CN201226204Y (en) | 2008-06-27 | 2008-06-27 | Watchdog based on two singlechips and circuit for monitoring voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201226204Y true CN201226204Y (en) | 2009-04-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200820108859 Expired - Fee Related CN201226204Y (en) | 2008-06-27 | 2008-06-27 | Watchdog based on two singlechips and circuit for monitoring voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201226204Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101867366A (en) * | 2010-07-02 | 2010-10-20 | 北京联合大学生物化学工程学院 | Triangular wave generator with variable frequency and amplitude |
| CN102419796A (en) * | 2011-11-28 | 2012-04-18 | 上海理工大学 | Pulse width modulation (PWM) signal anti-interference output system for medical equipment and anti-interference method for PWM signal anti-interference output system |
| CN105824738A (en) * | 2016-04-04 | 2016-08-03 | 合肥博雷电子信息技术有限公司 | Hardware watchdog device for computer body and software system monitoring module |
| CN111897265A (en) * | 2020-08-05 | 2020-11-06 | 电信科学技术第五研究所有限公司 | System for detecting running state of interface card of optical communication equipment |
-
2008
- 2008-06-27 CN CN 200820108859 patent/CN201226204Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101867366A (en) * | 2010-07-02 | 2010-10-20 | 北京联合大学生物化学工程学院 | Triangular wave generator with variable frequency and amplitude |
| CN101867366B (en) * | 2010-07-02 | 2012-05-23 | 北京联合大学生物化学工程学院 | Triangular wave generator with variable frequency and amplitude |
| CN102419796A (en) * | 2011-11-28 | 2012-04-18 | 上海理工大学 | Pulse width modulation (PWM) signal anti-interference output system for medical equipment and anti-interference method for PWM signal anti-interference output system |
| CN105824738A (en) * | 2016-04-04 | 2016-08-03 | 合肥博雷电子信息技术有限公司 | Hardware watchdog device for computer body and software system monitoring module |
| CN111897265A (en) * | 2020-08-05 | 2020-11-06 | 电信科学技术第五研究所有限公司 | System for detecting running state of interface card of optical communication equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090422 |