CN202205245U - Watchdog circuit for driving record - Google Patents
Watchdog circuit for driving record Download PDFInfo
- Publication number
- CN202205245U CN202205245U CN2011203240403U CN201120324040U CN202205245U CN 202205245 U CN202205245 U CN 202205245U CN 2011203240403 U CN2011203240403 U CN 2011203240403U CN 201120324040 U CN201120324040 U CN 201120324040U CN 202205245 U CN202205245 U CN 202205245U
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Abstract
The utility model relates to a watchdog circuit for a driving record system, which can monitor system operation automatically and has the advantages of being small in volume, little in occupied input/output line and convenient to program. A driving record master control central processing unit (CPU) and the watchdog circuit forms a watchdog application system, thereby simplifying hardware design, improving reliability of the system, reducing space requirements for printed circuit board, and reducing cost.
Description
Technical field
The utility model relates to a kind of watchdog circuit, relates in particular to a kind of watchdog circuit that is used for driving recording.
Background technology
Industrial control system all can run into various on-the-spot interference usually when operation at present, and antijamming capability is an important indicator weighing the industrial control system performance.Vehicle-running recording system is unstable, can influence its data acquisition result.Two types of house dog component software house dog and hardware watchdogs; Software watchdog does not need external hardware circuit, but a timer resource need be sold by system, and this is difficult to accomplish in many systems; And, possibly cause watchdog system also to be paralysed if the system software operation is undesired.Hardware watchdog is only house dog truly.The watchdog circuit of attribute is made up of 555 multivibrators, counter and some resistance, electric capacity etc. usually, and the circuit system that discrete component is formed is comparatively complicated, moves reliable inadequately.
The utility model content
The technical matters that the utility model solves is: make up a kind of watchdog circuit that is used for driving recording, overcome in the prior art, vehicle-running recording system moves insecure technical matters.
The technical scheme of the utility model is: make up a kind of watchdog circuit that is used for driving recording; Comprise driving recording processor, watchdog processor, capacitor C 1, capacitor C 2, resistance R 3 or door, said watchdog processor comprises that sheet is selected input CS, serial output so, serial input si, serial clock input sck, write-protect input wp, supply voltage input Vcc, output reset resets; Said supply voltage input Vcc meets write-protect input wp; The said output reset that resets connect capacitor C 2 after or door connect the reset terminal of driving recording processor; The said output reset that resets connects after the capacitor C 2 again through resistance R 3 ground connection, be connected on the power Vcc capacitor C 1 through or door connect the reset terminal of driving recording processor.
The further technical scheme of the utility model is: also comprise electrify restoration circuit; Said electrify restoration circuit comprises capacitor C 1, resistance R 2; Be connected on the power supply VCC capacitor C 1 through or door connect the reset terminal of driving recording processor, capacitor C 1 is ground connection after resistance R 2 simultaneously.
The further technical scheme of the utility model is: also comprise the manual reset circuit; Said manual reset circuit comprises reset switch S, resistance R 1, resistance R 2; Reset switch S one termination power VCC; Another termination R1 after or door connect the reset terminal of driving recording processor, ground connection after resistance R 2 simultaneously behind another termination R1.
The further technical scheme of the utility model is: the sheet that the watchdog processor sheet selects input CS to connect the driving processor selects input CPU-_CS, watchdog processor serial output so to meet the serial output CPU-_so of driving processor, the serial input CPU-_si that watchdog processor serial input si connects the driving processor, the serial clock input CPU-_sck that watchdog processor serial clock input sck connects the driving processor.
The technique effect of the utility model is: make up a kind of watchdog circuit that is used for driving recording, through adding crystal oscillator and reset circuit.The monitoring system operation voluntarily of this watchdog circuit, it is little to have a volume, takies the few and convenient programming of I/O mouth line; Add crystal oscillator and reset circuit and just can form the The application of single-chip computer system; WatchDog Timer and voltage monitoring circuit have been simplified hardware designs, improve the reliability of system; Minimizing reduces cost to the space requirement of printed circuit board.
Description of drawings
Fig. 1 is the circuit diagram of the utility model.
Embodiment
Below in conjunction with specific embodiment, the utility model technical scheme is further specified.
As shown in Figure 1; The embodiment of the utility model is: make up a kind of watchdog circuit that is used for driving recording; Comprise driving recording processor, watchdog processor, capacitor C 1, capacitor C 2, resistance R 3 or door, said watchdog processor comprises that sheet is selected input CS, serial output so, serial input si, serial clock input sck, write-protect input wp, supply voltage input Vcc, output reset resets; Said supply voltage input Vcc meets write-protect input wp; The said output reset that resets connect capacitor C 2 after or door connect the reset terminal of driving recording processor; The said output reset that resets connects after the capacitor C 2 again through resistance R 3 ground connection, be connected on the power Vcc capacitor C 1 through or door connect the reset terminal of driving recording processor.In the utility model, serial output so is output data by turn; Serial input si writes data or order by turn; Serial clock input sck, its rising edge writes data or order, and negative edge is exported data; Write-protect input wp, when its low level, write operation is under an embargo.In the specific embodiment, the sheet that the watchdog processor sheet selects input CS to connect the driving processor selects input CPU-_CS, watchdog processor serial output so to meet the serial output CPU-_so of driving processor, the serial input CPU-_si that watchdog processor serial input si connects the driving processor, the serial clock input CPU-_sck that watchdog processor serial clock input sck connects the driving processor.
As shown in Figure 1, the practical implementation process of the utility model is: WatchDog Timer is set, through presetting monitoring period in the watchdog processor.In the time of presetting at timer, do not have bus activity, watchdog processor will be exported a positive pulse, thereby make the driving recording processor reset through differentiating circuit electric capacity c2, resistance r3 from the high level signal of output reset output that resets again.Because the oscillator of driving recording processor is worked,, got final product in hundreds of seconds so the time constant of watchdog reset needn't be too big this moment.The preset time of WatchDog Timer is to set through the corresponding positions of the status register of watchdog.
As shown in Figure 1; The preferred implementation of the utility model is: also comprise electrify restoration circuit; Said electrify restoration circuit comprises capacitor C 1, resistance R 2, be connected on the power supply VCC capacitor C 1 through or door connect the reset terminal of driving recording processor, capacitor C 1 is ground connection after resistance R 2 simultaneously.
As shown in Figure 1; The preferred implementation of the utility model is: also comprise the manual reset circuit; Said manual reset circuit comprises reset switch S, resistance R 1, resistance R 2; Reset switch S one termination power VCC, another termination R1 after or door connect the reset terminal of driving recording processor, ground connection after resistance R 2 simultaneously behind another termination R1.
The technique effect of the utility model is: make up a kind of watchdog circuit that is used for driving recording, through adding crystal oscillator and reset circuit.The monitoring system operation voluntarily of this watchdog circuit, it is little to have a volume, takies the few and convenient programming of I/O mouth line; Add crystal oscillator and reset circuit and just can form the The application of single-chip computer system; WatchDog Timer and voltage monitoring circuit have been simplified hardware designs, improve the reliability of system; Minimizing reduces cost to the space requirement of printed circuit board.
Above content is the further explain that combines concrete preferred implementation that the utility model is done, and can not assert that the practical implementation of the utility model is confined to these explanations.For the those of ordinary skill of technical field under the utility model, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be regarded as belonging to the protection domain of the utility model.
Claims (4)
1. watchdog circuit that is used for driving recording; It is characterized in that; Comprise driving recording CPU processor, watchdog processor, capacitor C 1, capacitor C 2, resistance R 3 or door, said watchdog processor comprises that sheet is selected input CS, serial output so, serial input si, serial clock input sck, write-protect input wp, supply voltage input Vcc, output reset resets; Said supply voltage input Vcc meets write-protect input wp; The said output reset that resets connect capacitor C 2 after or door connect the reset terminal of driving recording processor; The said output reset that resets connects after the capacitor C 2 again through resistance R 3 ground connection, be connected on the power Vcc capacitor C 1 through or door connect the reset terminal of driving recording CPU processor.
2. according to the said watchdog circuit that is used for driving recording of claim 1; It is characterized in that; Also comprise electrify restoration circuit; Said electrify restoration circuit comprises capacitor C 1, resistance R 2, be connected on the power Vcc capacitor C 1 through or door connect the reset terminal of driving recording processor, capacitor C 1 is ground connection after resistance R 2 simultaneously.
3. according to the said watchdog circuit that is used for driving recording of claim 1; It is characterized in that; Also comprise the manual reset circuit, said manual reset circuit comprises reset switch S, resistance R 1, resistance R 2, reset switch S one termination power Vcc; Another termination R1 after or door connect the reset terminal of driving recording processor, ground connection after resistance R 2 simultaneously behind another termination R1.
4. according to the said watchdog circuit that is used for driving recording of claim 1; It is characterized in that the sheet that the watchdog processor sheet selects input CS to connect the driving processor selects input CPU-_CS, watchdog processor serial output so to meet the serial output CPU-_so of driving processor, the serial input CPU-_si that watchdog processor serial input si connects the driving processor, the serial clock input CPU-_sck that watchdog processor serial clock input sck connects the driving processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203240403U CN202205245U (en) | 2011-08-31 | 2011-08-31 | Watchdog circuit for driving record |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203240403U CN202205245U (en) | 2011-08-31 | 2011-08-31 | Watchdog circuit for driving record |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202205245U true CN202205245U (en) | 2012-04-25 |
Family
ID=45969356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203240403U Expired - Fee Related CN202205245U (en) | 2011-08-31 | 2011-08-31 | Watchdog circuit for driving record |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202205245U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728907A (en) * | 2014-01-20 | 2014-04-16 | 中国船舶重工集团公司第七一一研究所 | Diagnostic multi-type signal collecting module |
| CN106874149A (en) * | 2017-03-15 | 2017-06-20 | 深圳市亿道数码技术有限公司 | A kind of hardware watchdog logic circuit |
-
2011
- 2011-08-31 CN CN2011203240403U patent/CN202205245U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728907A (en) * | 2014-01-20 | 2014-04-16 | 中国船舶重工集团公司第七一一研究所 | Diagnostic multi-type signal collecting module |
| CN103728907B (en) * | 2014-01-20 | 2017-01-25 | 中国船舶重工集团公司第七一一研究所 | Diagnostic multi-type signal collecting module |
| CN106874149A (en) * | 2017-03-15 | 2017-06-20 | 深圳市亿道数码技术有限公司 | A kind of hardware watchdog logic circuit |
| CN106874149B (en) * | 2017-03-15 | 2023-11-21 | 深圳市亿道数码技术有限公司 | Hardware watchdog logic circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120425 Termination date: 20160831 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |