CN205827364U - A kind of hardware watchdog circuit for remote controllers - Google Patents
A kind of hardware watchdog circuit for remote controllers Download PDFInfo
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- CN205827364U CN205827364U CN201620388936.0U CN201620388936U CN205827364U CN 205827364 U CN205827364 U CN 205827364U CN 201620388936 U CN201620388936 U CN 201620388936U CN 205827364 U CN205827364 U CN 205827364U
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Abstract
This utility model provides a kind of hardware watchdog circuit for remote controllers, include monitoring chip U2, also include audion Q1, the emitter stage of audion Q1 is connected with the pin 1 on monitoring chip U2, the colelctor electrode of audion Q1 is connected with the reseting interface RESET on control chip U1, and the base stage of audion Q1 is connected with the pin PB5 on control chip U1 by resistance R2 and the base stage of this audion Q1 connects with ground also by resistance R3；The pin 4 of monitoring chip U2 is connected with the pin PB7 on control chip U1, and its pin 5 is connected with power supply VCC and is connected with electric capacity C3, and its pin 2 ground connection and the negative pole with electric capacity C3 are connected.This utility model solves the watchdog circuit of routine and remote controllers can be caused repeatedly to switch in dormancy and mode of operation, and the technical problem repeatedly restarted, and improves the stability of remote controllers work.
Description
Technical field
This utility model relates to electrical automotive circuits technical field, is specifically related to a kind of hardware watchdog circuit for remote controllers.
Background technology
Remote controllers (being commonly called as " automobile black box ") are the necessary assemblies of automobile leasing and management.Control chip in remote controllers is vulnerable to the interference of external environment condition in running, causes internal processes to run and flies and be absorbed in endless loop, or causes internal processes outage to be absorbed in dead state.Now, the hardware watchdog in remote controllers, owing to can not obtain " feeding Canis familiaris L. " signal that control chip sends over, just sends reset signal to control chip, makes remote controllers restart, thereby ensure that the stability of remote controllers work.
But, remote controllers rely on storage battery power supply, and when battery tension is too low, remote controllers must be operated in low-power consumption or park mode to lengthen working hours.Now, " feeding Canis familiaris L. " signal that the hardware watchdog in remote controllers sends over owing to can not obtain control chip, just send reset signal to control chip, make remote controllers restart and enter mode of operation；Remote controllers detect when battery tension is too low, can be again introduced into low-power consumption or park mode, so move in circles.Therefore conventional watchdog circuit can cause remote controllers repeatedly to switch in dormancy and mode of operation, and the technical problem repeatedly restarted, and causes the unstability that remote controllers work.
Utility model content
This utility model provides a kind of hardware watchdog circuit for remote controllers, solving conventional watchdog circuit can cause remote controllers repeatedly to switch in dormancy and mode of operation, and the technical problem repeatedly restarted, improve the stability of remote controllers work.
A kind of hardware watchdog circuit for remote controllers that this utility model provides, include monitoring chip U2, also include audion Q1, the emitter stage of audion Q1 is connected with the pin 1 on monitoring chip U2, the colelctor electrode of audion Q1 is connected with the reseting interface RESET on control chip U1, and the base stage of audion Q1 is connected with the pin PB5 on control chip U1 by resistance R2 and the base stage of this audion Q1 connects with ground also by resistance R3；The pin 4 of monitoring chip U2 is connected with the pin PB7 on control chip U1, and its pin 5 is connected with power supply VCC and is connected with electric capacity C3, and its pin 2 ground connection and the negative pole with electric capacity C3 are connected.
Wherein, audion Q1 has electrical switch function, when control chip U1 is in park mode, audion Q1 is off state, can interrupt monitoring the reset signal that chip U2 is transmitted to control chip U1 by pin 1, when control chip U1 is in mode of operation, audion Q1 is in the conduction state, and monitoring chip U2 can transmit reset signal by audion Q1 to control chip U1；Power supply VCC is connected with the pin 5 on monitoring chip U2, for powering to monitoring chip U2.
Further, control chip U1 is connected with power supply VCC also by resistance R1 and is connected with ground by electric capacity C1.So, the reseting interface RESET of control chip U1 can keep high level state by power supply VCC or electric capacity C1, it is to avoid control chip U1 is resetted by external disturbance.
Remote controllers are the necessary assemblies of automobile leasing and management.When battery tension is too low, remote controllers must be operated in low-power consumption or park mode to lengthen working hours, and conventional watchdog circuit can cause equipment repeatedly to switch in dormancy and normal mode.This utility model provides a kind of hardware enabling Canis familiaris L. circuit being applicable to park mode.This circuit increases an electrical switch being made up of audion between watchdog chip and control chip, and electrical switch conducting under normal mode, reset signal is effectively connected to control chip reseting pin；Under park mode, electrical switch disconnects, and reset signal is closed.This utility model efficiently solves the hardware that under park mode, custom hardware watchdog circuit causes and repeatedly restarts problem, can meet remote controllers high reliability and the application demand of low-power consumption work.This utility model hardware cost is low, circuit working stability, applies remote controllers batch assembling new forms of energy logistic car more than 300 platform of this circuit.
Operation principle of the present utility model:
When remote controllers are in mode of operation, in it, control chip U1 exports high level by pin PB5, and after resistance R2, R3 dividing potential drop, arrive the base stage of audion Q1, make audion Q1 in the conduction state, by pin 4, the signal that control chip U1 constantly exports " feeding Canis familiaris L. " by pin PB7 detects that the change of a low and high level i.e. represents successfully " feeding Canis familiaris L. " once to monitoring chip U2, monitoring chip U2；If monitoring chip U2 is not detected by a feeding-dog signal by pin 4 in the time interval set, then the pin 1 on monitoring chip U2 can export reset signal, and it is sent to control chip U1 by audion Q1, make the program restoring running of control chip to the state starting to perform from the original position of program storage.
When remote controllers enter low power consumpting state or park mode, the pin PB5 output low level of control chip U1 in it, and by arriving the base stage of audion Q1 after resistance R2, R3 dividing potential drop, make audion Q1 be off state；Simultaneously, control chip U1 no longer exports the signal of " feeding Canis familiaris L. " to monitoring chip U2 by pin PB7, when monitoring chip U2 and being not detected by a feeding-dog signal by pin 4 in the time interval set, then export reset signal by the pin 1 on monitoring chip U2, owing to audion Q1 is off state, then interrupt reset signal and transmit the path to control chip U1, therefore control chip U1 will not reset, and remote controllers also will not be waken up or restart, and it is constantly in low power consumpting state or park mode.
The beneficial effect that this utility model produces:
1, the technical solution of the utility model is used, audion Q1 is had owing to being connected between reseting interface RESET and the pin 1 of monitoring chip U2 of control chip U1, audion Q1 has electrical switch function, the audion Q1 being off state can interrupt coming from the reset signal of monitoring chip U2, it is prevented to be sent to control chip U1 further and make remote controllers be waken up or restart, it is ensured that remote controllers are constantly in low power consumpting state or park mode；Accordingly, with respect to prior art, this utility model solves the remote controllers that custom hardware watchdog circuit causes and repeatedly switches in dormancy and mode of operation, and the technical problem repeatedly restarted, and improves the stability of remote controllers work；
2, hardware watchdog circuit described in the utility model, its small volume, structure is the simplest, low cost, works more stable.
Accompanying drawing explanation
The accompanying drawing of the part constituting the application is used for providing being further appreciated by of the present utility model, and schematic description and description of the present utility model is used for explaining this utility model, is not intended that improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the structural representation of the remote controllers hardware watchdog circuit being applicable to park mode described in the utility model.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail, but the multitude of different ways that this utility model can be defined by the claims and cover is implemented.
With reference to Fig. 1, a kind of hardware watchdog circuit for remote controllers, include monitoring chip U2 and audion Q1, the emitter stage of audion Q1 is connected with the pin 1 on monitoring chip U2, the colelctor electrode of audion Q1 is connected with the reseting interface RESET on control chip U1, and the base stage of audion Q1 is connected with the pin PB5 on control chip U1 by resistance R2 and the base stage of this audion Q1 connects with ground also by resistance R3；The pin 4 of monitoring chip U2 is connected with the pin PB7 on control chip U1, and its pin 5 is connected with power supply VCC and is connected with electric capacity C3, and its pin 2 ground connection and the negative pole with electric capacity C3 are connected.Control chip U1 is connected with power supply VCC also by resistance R1 and is connected with ground by electric capacity C1.
When remote controllers are in mode of operation, in it, control chip U1 exports high level by pin PB5, and after resistance R2, R3 dividing potential drop, arrive the base stage of audion Q1, make audion Q1 in the conduction state, by pin 4, the signal that control chip U1 constantly exports " feeding Canis familiaris L. " by pin PB7 detects that the change of a low and high level i.e. represents successfully " feeding Canis familiaris L. " once to monitoring chip U2, monitoring chip U2.
When the control chip in remote controllers is disturbed by external environment condition in running, cause internal processes to run to fly and be absorbed in endless loop, or cause internal processes outage to be absorbed in dead state, or when remote controllers need to carry out system upgrade after have received the ROMPaq of remote server, control chip U1 will not feed the signal of Canis familiaris L. to monitoring chip U2 by pin PB7 output；If monitoring chip U2 is not detected by a feeding-dog signal by pin 4 in the time interval of 1.6ms, then monitor pin 1 output low level (i.e. reset signal) of chip U2, and this low level maintains 200ms, and it is sent to control chip U1 by audion Q1, make the program restoring running of control chip to the state starting to perform from the original position of program storage.
When remote controllers detect the brownout of accumulator, in order to lengthen working hours, just low power consumpting state or park mode are entered, now, the pin PB5 output low level of the control chip U1 in remote controllers, and by arriving the base stage of audion Q1 after resistance R2, R3 dividing potential drop, make audion Q1 be off state；Simultaneously, control chip U1 no longer exports the signal of " feeding Canis familiaris L. " to monitoring chip U2 by pin PB7, when monitoring chip U2 and being not detected by a feeding-dog signal in the time interval of 1.6ms by pin 4, the then pin 1 meeting output low level (i.e. reset signal) on monitoring chip U2, owing to audion Q1 is off state, then interrupt reset signal and transmit the path to control chip U1, therefore control chip U1 will not reset and restart, thus ensure that remote controllers will not be waken up or restart, and it is constantly in low power consumpting state or park mode, therefore solve the remote controllers that custom hardware watchdog circuit causes repeatedly to switch in dormancy and mode of operation, and the technical problem repeatedly restarted, improve the stability of remote controllers work.
Claims (2)
1. the hardware watchdog circuit for remote controllers, include monitoring chip U2, it is characterized in that, also include audion Q1, the emitter stage of audion Q1 is connected with the pin 1 on monitoring chip U2, the colelctor electrode of audion Q1 is connected with the reseting interface RESET on control chip U1, and the base stage of audion Q1 is connected with the pin PB5 on control chip U1 by resistance R2 and the base stage of this audion Q1 connects with ground also by resistance R3；The pin 4 of monitoring chip U2 is connected with the pin PB7 on control chip U1, and its pin 5 is connected with power supply VCC and is connected with electric capacity C3, and its pin 2 ground connection and the negative pole with electric capacity C3 are connected.
2. the hardware watchdog circuit for remote controllers as claimed in claim 1, it is characterised in that control chip U1 is connected with power supply VCC also by resistance R1 and is connected with ground by electric capacity C1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620388936.0U CN205827364U (en) | 2016-05-04 | 2016-05-04 | A kind of hardware watchdog circuit for remote controllers |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620388936.0U CN205827364U (en) | 2016-05-04 | 2016-05-04 | A kind of hardware watchdog circuit for remote controllers |
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| Publication Number | Publication Date |
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| CN205827364U true CN205827364U (en) | 2016-12-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106383750A (en) * | 2016-05-04 | 2017-02-08 | 湖南小步科技有限公司 | Remote controller hardware watchdog circuit |
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- 2016-05-04 CN CN201620388936.0U patent/CN205827364U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106383750A (en) * | 2016-05-04 | 2017-02-08 | 湖南小步科技有限公司 | Remote controller hardware watchdog circuit |
| CN106383750B (en) * | 2016-05-04 | 2019-03-15 | 湖南小步科技有限公司 | A kind of hardware watchdog circuit for remote controllers |
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