CN201294094Y - Reset circuit for watchdog of vehicle-mounted player - Google Patents
Reset circuit for watchdog of vehicle-mounted player Download PDFInfo
- Publication number
- CN201294094Y CN201294094Y CNU2008201533982U CN200820153398U CN201294094Y CN 201294094 Y CN201294094 Y CN 201294094Y CN U2008201533982 U CNU2008201533982 U CN U2008201533982U CN 200820153398 U CN200820153398 U CN 200820153398U CN 201294094 Y CN201294094 Y CN 201294094Y
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- China
- Prior art keywords
- reverser
- watchdog
- interface
- reset circuit
- vehicle player
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Abstract
The utility model relates to a watchdog reset circuit of a vehicle mounted player, which comprises a watchdog chip and a plurality of reversers, wherein the watchdog chip is provided with a reset signal output interface, the reset signal output interface is connected with an input terminal of a first reverser, and an output terminal of the first reverser is respectively connected with input terminals of a second reverser, a third reverser, a forth reverser, a fifth reverser and a sixth reverser. Under the circumstance that a procedure runs to fly or stops working and that a feed dog function is blocked, the purpose of restarting the vehicle mounted player can be achieved by operating resetting action thereby the watchdog reset circuit used in vehicle mounted players can reduce manual operations caused by machine faults and save maintenance cost.
Description
Technical field
The utility model relates to a kind of reset circuit, particularly a kind of watchdog reset circuit that is used for in-vehicle player.
Background technology
In in-vehicle player, because player environment of living in is more abominable, extraneous vibration interference causes the race of player system program to fly easily, and make program be absorbed in endless loop, the normal operation of program is interrupted, player system can't work on, and can cause total system to be absorbed in dead state, and unpredictable consequence takes place.
The utility model content
The purpose of this utility model is to provide a kind of watchdog reset circuit that is used for in-vehicle player, can reduce the manual operation that brings owing to mechanical disorder, reduces maintenance cost.
In order to achieve the above object, the technical scheme that the utility model provides is, a kind of watchdog reset circuit that is used for in-vehicle player, comprise watchdog chip, a plurality of reverser, described watchdog chip is provided with the reset signal output interface, described reset signal output interface is connected with the input end of first reverser, and the output terminal of described first reverser is connected with second reverser, the 3rd reverser, the 4th reverser, the 5th reverser and the input end of the 6th reverser respectively.
The above-mentioned watchdog reset circuit that is used for in-vehicle player, wherein, described watchdog chip also is provided with power interface and ground interface; Described power interface is connected with external power source, described ground interface ground connection.
The above-mentioned watchdog reset circuit that is used for in-vehicle player wherein, also comprises first wire jumper and second wire jumper, and described watchdog chip also is provided with hand-reset input interface and spill over interface; Described hand-reset input interface is connected with ground by first wire jumper, and described spill over interface is by second wire jumper and hand-reset input interface.
The above-mentioned watchdog reset circuit that is used for in-vehicle player, wherein, described watchdog chip also is provided with feeding-dog signal interface and power monitoring output interface; Described feeding-dog signal interface is connected with external oscillator or master chip.
The above-mentioned watchdog reset circuit that is used for in-vehicle player wherein, also is connected with an electric capacity between first output terminal of described reverser and its second output terminal.
The above-mentioned watchdog reset circuit that is used for in-vehicle player, wherein, the model of described reverser is 74LC * 04MTC.
The above-mentioned watchdog reset circuit that is used for in-vehicle player, wherein, the electric capacity of described electric capacity is 0.1 microfarad.
The utility model makes it compared with prior art owing to adopt technique scheme, has the following advantages and good effect:
1, in in-vehicle player, adds the watchdog reset circuit that the utility model is used for in-vehicle player, when the extraneous vibration interference causes the player system program fleet, the watchdog reset circuit that the utility model is used for in-vehicle player can interrupt starting homing action because of feeding the dog function, and then the restarting systems program, make in-vehicle player be more suitable for vehicle environment.
2, the utility model watchdog reset circuit of being used for in-vehicle player can reduce the manual operation that brings owing to mechanical disorder, reduces maintenance cost.
Description of drawings
Fig. 1 is the structural representation that the utility model is used for the watchdog reset circuit of in-vehicle player.
Embodiment
Specify more excellent embodiment of the present utility model below in conjunction with accompanying drawing.
Referring to Fig. 1, a kind of watchdog reset circuit that is used for in-vehicle player comprises watchdog chip 1, a plurality of reverser, electric capacity and a plurality of wire jumper.
Described watchdog chip 1 be provided with power interface Vcc, hand-reset input interface/WR, power monitoring input interface/PFI, power monitoring output interface/PFO, interface GND, feeding-dog signal interface/WDI, spill over interface/WDO and reset signal output interface/RST.
Described hand-reset input interface/WR is connected with ground by the first wire jumper JP1, and described spill over interface/WDO is by the second wire jumper JP2 and hand-reset input interface/WR.
Described power interface Vcc is connected with external power source, described power monitoring input interface/PFI and ground interface GND ground connection.
Described reset signal output interface/RST is connected with the input end of reverser 21, the output terminal of described reverser 21 is connected with reverser 22, reverser 23, reverser 24, reverser 25 and the input end of reverser 26 respectively, promptly described reverser 22, reverser 23, reverser 24, reverser 25 and reverser 26 parallel connections; First output terminal 241 of described reverser 24 is connected with external power source, and its second output terminal 242 is connected with ground, and also is connected with an electric capacity 3 between first output terminal 241 of reverser 24 and its second output terminal 242.
The model of described reverser is 74LC * 04MTC.
The electric capacity of described electric capacity 3 is 0.1 microfarad.
Described feeding-dog signal interface/WDI can be connected (not shown) with oscillator, and for example the oscillator of CPU produces feeding-dog signal by oscillator, and described feeding-dog signal is imported watchdog chip 1 by feeding-dog signal interface/WDI, and watchdog chip 1 begins counting.In in-vehicle player, described feeding-dog signal interface/WDI is connected with master chip in the in-vehicle player mainboard, master chip is fed dog WDI action by the simulation of GPIO mouth, constantly feed dog to watchdog chip, if because abnormal conditions such as program fleet, time the inside master chip at 1.6 seconds does not send hello dog WDI signal to come, then spill over interface/WDO produces control signal, input interface/WR automatically resets to watchdog chip by hand-reset, reset signal output interface/RST can produce reset signal automatically, and the reset signal of output is transferred to the reset terminal of microprocessor.
In in-vehicle player, under the situation of program fleet or deadlock, interrupt starting homing action owing to feeding the dog function, and reach the purpose that restarts, therefore the utility model watchdog reset circuit of being used for in-vehicle player can reduce the manual operation that brings owing to mechanical disorder, the minimizing maintenance cost.
Claims (7)
1, a kind of watchdog reset circuit that is used for in-vehicle player, comprise watchdog chip (1), described watchdog chip (1) be provided with the reset signal output interface (/RST), it is characterized in that, also comprise a plurality of reversers (21,22,23,24,25,26), described reset signal output interface (/RST) input end with reverser (21) is connected, and the output terminal of described reverser (21) is connected with reverser (22), reverser (23), reverser (24), reverser (25) and the input end of reverser (26) respectively.
2, the watchdog reset circuit that is used for in-vehicle player as claimed in claim 1 is characterized in that, described watchdog chip (1) also is provided with power interface Vcc and ground interface GND; Described power interface Vcc is connected with external power source, described ground interface GND ground connection.
3, the watchdog reset circuit that is used for in-vehicle player as claimed in claim 1, it is characterized in that, also comprise the first wire jumper JP1 and the second wire jumper JP2, described watchdog chip (1) also be provided with the hand-reset input interface (/WR) and the spill over interface (/WDO); Described hand-reset input interface (/WR) be connected with ground by the first wire jumper JP1, described spill over interface (/WDO) pass through the second wire jumper JP2 and hand-reset input interface (/WR).
4, the watchdog reset circuit that is used for in-vehicle player as claimed in claim 1 is characterized in that, described watchdog chip (1) also be provided with the feeding-dog signal interface (/WDI) and the power monitoring output interface (/PFO); Described feeding-dog signal interface (/WDI) be connected with external oscillator or master chip.
5, the watchdog reset circuit that is used for in-vehicle player as claimed in claim 1 is characterized in that, also is connected with an electric capacity (3) between first output terminal (241) of described reverser (24) and its second output terminal (242).
6, the watchdog reset circuit that is used for in-vehicle player as claimed in claim 1 is characterized in that, the model of described reverser (21,22,23,24,25,26) is 74LC * 04MTC.
7, the watchdog reset circuit that is used for in-vehicle player as claimed in claim 5 is characterized in that, the electric capacity of described electric capacity (3) is 0.1 microfarad.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201533982U CN201294094Y (en) | 2008-09-24 | 2008-09-24 | Reset circuit for watchdog of vehicle-mounted player |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201533982U CN201294094Y (en) | 2008-09-24 | 2008-09-24 | Reset circuit for watchdog of vehicle-mounted player |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201294094Y true CN201294094Y (en) | 2009-08-19 |
Family
ID=41007579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201533982U Expired - Fee Related CN201294094Y (en) | 2008-09-24 | 2008-09-24 | Reset circuit for watchdog of vehicle-mounted player |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201294094Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101685651B (en) * | 2008-09-24 | 2013-02-13 | 上海国宽信息科技有限公司 | Watchdog reset circuit for vehicle-mounted displayer |
-
2008
- 2008-09-24 CN CNU2008201533982U patent/CN201294094Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101685651B (en) * | 2008-09-24 | 2013-02-13 | 上海国宽信息科技有限公司 | Watchdog reset circuit for vehicle-mounted displayer |
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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: 20090819 Termination date: 20120924 |