CN208999992U - A kind of house dog protection circuit based on android system - Google Patents
A kind of house dog protection circuit based on android system Download PDFInfo
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- CN208999992U CN208999992U CN201821858997.4U CN201821858997U CN208999992U CN 208999992 U CN208999992 U CN 208999992U CN 201821858997 U CN201821858997 U CN 201821858997U CN 208999992 U CN208999992 U CN 208999992U
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Abstract
The utility model relates to field of circuit technology.The utility model discloses a kind of house dogs based on android system to protect circuit, level conversion device and watchdog chip including model SN74LVC1G125, the hand-reset input terminal of the watchdog chip is connect with overtime output end, the reset signal output end of the watchdog chip and the resetting pin of single-chip microcontroller connect, the feeding-dog signal input pin of the watchdog chip is connect with the output end Y of level conversion device, the enable signal input terminal OE of the level conversion device and the enable signal output end of single-chip microcontroller connect, the input terminal A of the level conversion device and the feeding-dog signal output end of single-chip microcontroller connect.The utility model starts to system application stage enabling house dog from system electrification, bootstrap, kernel, it is realized in the overall process of embedded system and feeds dog guard system, the reliability of raising system, and it is directed to the electrifying startup characteristic of Android system, increase shielding watchdog function when electrifying startup, system mistake is avoided to restart.
Description
Technical field
The utility model belongs to field of circuit technology, protects electricity more particularly to a kind of house dog based on android system
Road.
Background technique
Current Android industrial control board in a variety of different industries using increasingly wider, also increasingly to equipment service requirement
Height, especially in unmanned nurse environment, it is desirable that the normal boot-strap operation in 24 hours of embedded industrial control equipment, this sets circuit board
Meter proposes a very big safety test.In the Android system that single-chip microcontroller is constituted, when system is seriously done by external environment
It when disturbing, may be can not work normally by monolithic processor controlled Android system, will cause whole system and enter dead state, occurred
Unpredictable consequence.House dog is exactly the case where periodically checking chip interior, once mistake, which occurs, issues Restart Signal
Circuit avoids whole system from entering dead state, and unpredictable consequence occurs.Currently, most of watchdog circuit is using soft
Part house dog, reliability cannot be protected, and general hardware watchdog also fails to consider starting up's rank of Android system
Duan Buneng feeds the movement of dog, and Android system mistake is caused to be restarted.
Summary of the invention
The purpose of this utility model is to provide a kind of house dog protection circuit based on android system is above-mentioned to solve
?.
To achieve the above object, a kind of the technical solution adopted in the utility model are as follows: house dog guarantor based on android system
Protection circuit, level conversion device and watchdog chip including model SN74LVC1G125, the watchdog chip it is manual
The RESET input is connect with overtime output end, and the reset signal output end of the watchdog chip and the resetting pin of single-chip microcontroller connect
It connects, the feeding-dog signal input pin of the watchdog chip is connect with the output end Y of level conversion device, the level conversion device
Enable signal input terminal OE and single-chip microcontroller enable signal output end connect, the input terminal A and list of the level conversion device
The feeding-dog signal output end of piece machine connects.
Further, the model SP706S of the watchdog chip.
Further, the reset signal output end of the watchdog chip is grounded by capacitor C197.
Further, the capacitance of the capacitor C197 is 330pF.
Further, the power end Vcc of the level conversion device meets power supply VCC_IO, while being connect by capacitor C486
Ground.
Further, the capacitance of the capacitor C486 is 1uF.
Further, the enable signal input terminal OE also series resistance R101 of the level conversion device meets power supply VCC_
IO。
Further, the resistance value of the resistance R101 is 10K.
The advantageous effects of the utility model:
The utility model starts to system application stage enabling house dog from system electrification, bootstrap, kernel, is being embedded in
It is realized in the overall process of formula system and feeds dog guard system, improve the reliability of system, and special for the electrifying startup of Android system
Property, increase shielding watchdog function when electrifying startup, system mistake is avoided to restart.Circuit structure is simple, it is easy to accomplish.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model specific embodiment.
Specific embodiment
Now in conjunction with the drawings and specific embodiments, the present invention will be further described.
As shown in Figure 1, a kind of house dog based on android system protects circuit, the electricity including model SN74LVC1G125
Flat switching device U22 and watchdog chip U29, in this specific embodiment, the model of the watchdog chip U29 is preferably
SP706S, but it is not limited to this, in other embodiments, is also possible to other models of homologous series or the house dog of other series
Chip, this is that those skilled in the art can realize easily, is no longer described in detail.
The hand-reset input terminal MR of the watchdog chip U29 is connect with time-out output end WDO, it is preferred that multiple manually
Position input terminal MR and time-out output end WDO can access the resistance R388 of a small resistance value, the reset of the watchdog chip U29
Signal output end RESET is connect with the resetting pin of single-chip microcontroller (being based on Android system), the feeding-dog signal of the watchdog chip U29
Input pin WDI is connect with the output end Y of level conversion device U22, it is preferred that feeding-dog signal input pin WDI and level translator
The resistance R380 of a small resistance value can be concatenated between the output end Y of part U22, the power end VCC of the watchdog chip U29 connects
The end GND and the end PFI of power supply VCC_IO, the watchdog chip U29 are grounded simultaneously, and the end PFO of the watchdog chip U29 is outstanding
It is empty.
The enable signal input terminal OE of the level conversion device U22 and enable signal output end WTG_EN of single-chip microcontroller
(the GPIO mouth of single-chip microcontroller) connection, the input terminal A of the level conversion device U22 and the feeding-dog signal output end WTG_ of single-chip microcontroller
OUT (the GPIO mouth of single-chip microcontroller) connection, the power end Vcc of the level conversion device U22 meets power supply VCC_IO.
In this specific embodiment, the reset signal output end RESET of the watchdog chip U29 also passes through capacitor C197 and connects
The capacitance on ground, the capacitor C197 is 330pF, is filtered to reset signal, and stability is improved.
In this specific embodiment, the power end Vcc of the level conversion device U22 also passes through capacitor C486 and is grounded, described
The capacitance of capacitor C486 is 1uF, improves the electrical stability of power end Vcc.
Further, in this specific embodiment, the enable signal input terminal OE also series electrical of the level conversion device U22
Resistance R101 meets power supply VCC_IO, carries out strong pull-up to the enable signal input terminal OE of level conversion device U22, improves reliability.
Specifically, the resistance value of the resistance R101 is 10K in the present embodiment.
The course of work:
1. industrial control board just powers on, watchdog chip U29 automatically generates 200ms low level reset signal, makes single-chip microcontroller just
Often reset.
2. after powering on, when system there is not completion initialization also, also no operation hello dog program does not start hello dog to system, and single-chip microcontroller makes
Energy signal output end WTG_EN default exports high level to the enable signal input terminal OE of level conversion device U22, turns level
The output end Y of parallel operation part U22 exports high-impedance state to the feeding-dog signal input pin WDI of watchdog chip U29, shields house dog function
Can, output reset signal, does not avoid being greater than 1.6S due to initialization time, system mistake is caused to be restarted.
3. after the completion of system initialization, single-chip microcontroller Android system, which brings into operation, feeds dog program, and the enable signal of single-chip microcontroller is defeated
Outlet WTG_EN exports low level, feeding-dog signal output end WTG_OUT output feeding-dog signal (the output 0.5S high electricity of single-chip microcontroller
Flat, timer timing 0.5S is arrived, then overturns output 0.5S low level, is so recycled) house dog core is given through level conversion device U22
The feeding-dog signal input pin WDI of piece U29.When system failure race is dead, output level, watchdog chip are not overturn more than 1.6S
The reset signal output end RESET of U29, which is exported, resets low level to the resetting pin of single-chip microcontroller, and Android system is restarted.
4. such as entering software upgrading, the enable signal output end of single-chip microcontroller when Android system needs to change working condition
WTG_EN exports high level, does not enable watchdog chip U29, i.e. shielding watchdog circuit function, and not so system stops feeding dog, meeting
Lead to watchdog chip U29 output reset signal always, system is being restarted always.
The utility model starts to system application stage enabling house dog from system electrification, bootstrap, kernel, is being embedded in
It is realized in the overall process of formula system and feeds dog guard system, improve the reliability of system, and special for the electrifying startup of Android system
Property, increase shielding watchdog function when electrifying startup, system mistake is avoided to restart.Circuit structure is simple, it is easy to accomplish.
Although specifically showing and describing the utility model in conjunction with preferred embodiment, those skilled in the art is answered
This is understood, in the spirit and scope for not departing from the utility model defined by the appended claims, in form and details
On the utility model can be made a variety of changes, be the protection scope of the utility model.
Claims (8)
1. a kind of house dog based on android system protects circuit, it is characterised in that: the electricity including model SN74LVC1G125
Flat switching device and watchdog chip, the hand-reset input terminal of the watchdog chip is connect with overtime output end, described to see
Door dog chip reset signal output end and single-chip microcontroller resetting pin connect, the feeding-dog signal input pin of the watchdog chip with
The output end Y connection of level conversion device, the enable signal input terminal OE of the level conversion device and the enabled letter of single-chip microcontroller
The connection of number output end, the input terminal A of the level conversion device and the feeding-dog signal output end of single-chip microcontroller connect.
2. house dog based on android system according to claim 1 protects circuit, it is characterised in that: the house dog core
The model SP706S of piece.
3. house dog based on android system according to claim 2 protects circuit, it is characterised in that: the house dog core
The reset signal output end of piece is grounded by capacitor C197.
4. house dog based on android system according to claim 3 protects circuit, it is characterised in that: the capacitor C197
Capacitance be 330pF.
5. house dog based on android system according to claim 2 protects circuit, it is characterised in that: the level conversion
The power end Vcc of device meets power supply VCC_IO, while being grounded by capacitor C486.
6. house dog based on android system according to claim 5 protects circuit, it is characterised in that: the capacitor C486
Capacitance be 1uF.
7. house dog based on android system according to claim 5 protects circuit, it is characterised in that: the level conversion
The enable signal input terminal OE also series resistance R101 of device meets power supply VCC_IO.
8. house dog based on android system according to claim 7 protects circuit, it is characterised in that: the resistance R101
Resistance value be 10K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821858997.4U CN208999992U (en) | 2018-11-13 | 2018-11-13 | A kind of house dog protection circuit based on android system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821858997.4U CN208999992U (en) | 2018-11-13 | 2018-11-13 | A kind of house dog protection circuit based on android system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208999992U true CN208999992U (en) | 2019-06-18 |
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ID=66807424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821858997.4U Active CN208999992U (en) | 2018-11-13 | 2018-11-13 | A kind of house dog protection circuit based on android system |
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| CN (1) | CN208999992U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111090323A (en) * | 2019-12-24 | 2020-05-01 | 上海移远通信科技有限公司 | Power-off protection circuit of control chip, software upgrading circuit and control system |
| CN112965412A (en) * | 2021-02-02 | 2021-06-15 | 广州大学华软软件学院 | MCU unit resetting method and system and CAN anti-interference communication device |
-
2018
- 2018-11-13 CN CN201821858997.4U patent/CN208999992U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111090323A (en) * | 2019-12-24 | 2020-05-01 | 上海移远通信科技有限公司 | Power-off protection circuit of control chip, software upgrading circuit and control system |
| CN112965412A (en) * | 2021-02-02 | 2021-06-15 | 广州大学华软软件学院 | MCU unit resetting method and system and CAN anti-interference communication device |
| CN112965412B (en) * | 2021-02-02 | 2022-02-22 | 广州大学华软软件学院 | MCU unit resetting method and system and CAN anti-interference communication device |
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