CN110217184A - The hardware watchdog of mobile unit meets the implementation method and circuit of low-power consumption requirement - Google Patents
The hardware watchdog of mobile unit meets the implementation method and circuit of low-power consumption requirement Download PDFInfo
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- CN110217184A CN110217184A CN201810175567.0A CN201810175567A CN110217184A CN 110217184 A CN110217184 A CN 110217184A CN 201810175567 A CN201810175567 A CN 201810175567A CN 110217184 A CN110217184 A CN 110217184A
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- Prior art keywords
- pin
- signal
- dog
- mcu
- switch
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/22—Modifications for ensuring a predetermined initial state when the supply voltage has been applied
Abstract
The present invention relates to implementation methods and circuit that the hardware watchdog of mobile unit meets low-power consumption requirement, in the case where MCU suspend mode, without carrying out feeding-dog signal to hardware watchdog, by making hardware watchdog not generate reset signal, and then allow MCU normally in Low-power-consumptiodormancy dormancy state.The present invention first disables house dog, realizes the enabled of control house dog when needing to wake up MCU, then through wake source, realizes using under hardware watchdog, MCU can normally be in low power consumpting state.Meanwhile if MCU crashes under suspend mode, MCU can be resetted again under wake source effect.In the present invention, realizes outer triggering signal and the use of hardware watchdog is controlled, be conducive to the system stability for enhancing mobile unit, while not influencing allomeric function control, realize product low power dissipation design, be conducive to optimizing product design.
Description
Technical field
The present invention relates to circuit design field, more specifically to a kind of mobile unit hardware watchdog meet it is low
The implementation method of power consumption requirements and a kind of hardware watchdog of mobile unit meet the circuit of low-power consumption requirement.
Background technique
After automobile flameout, the electricity consumption of mobile unit is powered by Vehicular accumulator cell, thus, vehicle is for vehicle-mounted
The power consumption requirements of equipment are very stringent.Under this setting, mobile unit requires ten to its low-power consumption in the case where vehicle stall
Divide stringent.
And in mobile unit, hardware watchdog chip plays crucial work for improving the system stability of mobile unit
With.But for the single-chip microcontroller under STOP mode (standby mode), and can be influenced by hardware watchdog chip functions, nothing
Method normally enters suspend mode.Hardware watchdog chip is more than meeting after a certain period of time without feeding-dog signal at external (single-chip microcontroller)
A reset signal is issued to single-chip microcontroller, wakes up single-chip microcontroller.And under low-power dissipation system, single-chip microcontroller is needed in STOP mode,
Related I/O pin can not export feeding-dog signal.Thus after single-chip microcontroller enters STOP mode, hardware watchdog can be produced in the short time
Raw reset signal, causes single-chip microcontroller to be restarted, then single-chip microcontroller can not normally keep being in suspend mode.So now most
Mobile unit does not use hardware watchdog, and the system of mobile unit is caused to take place frequently the phenomenon that crashing.
The prior art lacks the contradictory technical solution solved between hardware watchdog and low-power consumption requirement.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide one kind can overcome hardware watchdog and low-power consumption
The hardware watchdog of contradictory mobile unit between it is required that meets the implementation method of low-power consumption requirement, the hardware with mobile unit
House dog meets the circuit of low-power consumption requirement.
Technical scheme is as follows:
A kind of hardware watchdog of mobile unit meets the implementation method of low-power consumption requirement, is controlled by outer triggering signal
The WDI pin of house dog is hanging, or connects with the feeding-dog signal of MCU；When the WDI pin of house dog is hanging, the timing of house dog
Device disability, house dog do not generate reset signal, and MCU keeps standby mode；MCU after wake-up generates feeding-dog signal, just looks at door
The feeding-dog signal of the WDI pin connection MCU of dog, enables the timer of house dog.
Preferably, switch is arranged between the TCK pin of WDI pin and MCU the transmission feeding-dog signal of house dog, pass through
The on-off of outer triggering signal control switch；When switch disconnects, WDI pin is hanging；When closing the switch, WDI pin and TCK pin
Connection.
Preferably, the switch is analog switch, the corresponding I/O pin of analog switch is separately connected external trigger letter
Number, the feeding-dog signal of MCU, house dog WDI pin, hanging；When outer triggering signal is low level, connect MCU feeds dog letter
Number pin, the link connection between hanging pin, then the WDI pin of house dog is hanging；When outer triggering signal is high electricity
It is flat, connect the link connection between the pin of the feeding-dog signal of MCU, the pin for the WDI pin for connecting house dog.
Preferably, outer triggering signal carries out voltage judgement by voltage decision circuitry, and switch-over control signal is exported,
Analog switch carries out the switching of signal link by switch-over control signal；When outer triggering signal is low level, voltage judgement electricity
The switch-over control signal on road is high level, connects the link connection between the pin of the feeding-dog signal of MCU, hanging pin, then
The WDI pin of house dog is hanging；When outer triggering signal is high level, the switch-over control signal of voltage decision circuitry is low electricity
It is flat, connect the link connection between the pin of the feeding-dog signal of MCU, the pin for the WDI pin for connecting house dog.
Preferably, the outer triggering signal is the ACC_IN level height or other equipment terminal of vehicle
The level height of wake-up signal.
A kind of hardware watchdog of mobile unit meets the circuit of low-power consumption requirement, and the WDI pin of house dog passes through switch
It is connect with the feeding-dog signal of MCU, the reseting pin of house dog is connect with MCU；By the on-off of outer triggering signal control switch,
And then the WDI pin for controlling house dog is hanging, or connects with the feeding-dog signal of MCU；When switch disconnection, the WDI pin of house dog
Vacantly, the timer disability of house dog, house dog do not generate reset signal, and MCU keeps standby mode；MCU after wake-up is generated
Feeding-dog signal, when closing the switch, the feeding-dog signal of the WDI pin connection MCU of house dog enables the timer of house dog.
Preferably, the switch is analog switch, the corresponding I/O pin of analog switch is separately connected external trigger letter
Number, the feeding-dog signal of MCU, house dog WDI pin, hanging；When outer triggering signal is low level, connect MCU feeds dog letter
Number pin, the link connection between hanging pin, then the WDI pin of house dog is hanging；When outer triggering signal is high electricity
It is flat, connect the link connection between the pin of the feeding-dog signal of MCU, the pin for the WDI pin for connecting house dog.
Preferably, between outer triggering signal and analog switch be arranged voltage decision circuitry, to outer triggering signal into
The judgement of row voltage, and switch-over control signal is exported, analog switch carries out the switching of signal link by switch-over control signal.
Preferably, voltage decision circuitry be based on triode, the base stage of outer triggering signal connecting triode, triode
Emitter grounding, collector access MCU operating voltage, and switch-over control signal is picked out from collector；When outer triggering signal is low electricity
Flat, triode cut-off, switch-over control signal is high level, connects the chain between the pin of the feeding-dog signal of MCU, hanging pin
Road connection；When outer triggering signal is high level, triode ON, switch-over control signal is low level, and connect MCU feeds dog letter
Number pin, connect house dog WDI pin pin between link connection.
Beneficial effects of the present invention are as follows:
The hardware watchdog of mobile unit of the present invention meets the implementation method and circuit of low-power consumption requirement, in MCU
In the case where suspend mode, do not have to carry out feeding-dog signal to hardware watchdog, by making hardware watchdog not generate reset signal, in turn
Allow MCU normally in Low-power-consumptiodormancy dormancy state.
The present invention first disables house dog, realizes making for control house dog when needing to wake up MCU, then through wake source
Can, it realizes using under hardware watchdog, MCU can normally be in low power consumpting state.It, can meanwhile if MCU crashes under suspend mode
To reset MCU again in the case where wake source acts on.
In the present invention, realizes outer triggering signal and the use of hardware watchdog is controlled, be conducive to enhance mobile unit
System stability, while not influencing allomeric function control, realize product low power dissipation design, be conducive to optimizing product design.
Detailed description of the invention
Fig. 1 is the functional block diagram of circuit of the invention；
Fig. 2 is the circuit design drawing of embodiment.
Specific embodiment
The present invention is further described in detail with reference to the accompanying drawings and embodiments.
For the present invention in order to solve in the prior art, existing contradiction between hardware watchdog and low-power consumption requirement provides one
The hardware watchdog of kind of mobile unit meets the implementation method of low-power consumption requirement and the hardware watchdog of mobile unit meet it is low
The circuit of power consumption requirements, MCU are in standby, and the clocking capability failure of house dog, MCU is in running order, house dog
Clocking capability is normal, wants so that mobile unit in the case where being provided with hardware watchdog, also can satisfy stringent low-power consumption
It asks.
Based on the technical teaching, the hardware watchdog of mobile unit of the present invention meets the reality of low-power consumption requirement
Existing method, the WDI pin for controlling house dog by outer triggering signal (wake source) is hanging, or connects with the feeding-dog signal of MCU；
When the WDI pin of house dog is hanging, the timer disability of house dog, the timer of house dog is without counting, and then house dog
Reset signal is not generated, so that MCU will not be resetted by watchdog chip, MCU keeps standby mode；MCU after wake-up is generated
Feeding-dog signal, and the feeding-dog signal of the WDI pin connection MCU of house dog, enable the timer of house dog, the timer of house dog
It is counted.
The state switching of the WDI pin of house dog is realized by switch, in the present invention, in the WDI pin of house dog
It sends to be arranged between the TCK pin of feeding-dog signal with MCU and switch, pass through the on-off of outer triggering signal control switch；Work as switch
It disconnects, WDI pin is hanging；When closing the switch, WDI pin is connected to TCK pin.
Corresponding to the method, the hardware watchdog that the present invention provides a kind of mobile unit meets the electricity of low-power consumption requirement
Road, as shown in Figure 1, the WDI pin of house dog is connect by switch with the feeding-dog signal of MCU, the reseting pin and MCU of house dog
Connection；By the on-off of outer triggering signal control switch, and then the WDI pin for controlling house dog is hanging, or hello the dog with MCU
Signal is connected；When switch disconnects, the WDI pin of house dog is hanging, and the timer disability of house dog, house dog does not generate reset letter
Number, MCU keeps standby mode；MCU after wake-up generates feeding-dog signal, and when closing the switch, the WDI pin of house dog is connected to MCU
Feeding-dog signal, enable house dog timer.
In order to facilitate realizing and reaching stable working condition, the switch is analog switch, and analog switch is corresponding
I/O pin be separately connected outer triggering signal, the feeding-dog signal of MCU, house dog WDI pin, hanging；Work as outer triggering signal
For low level, the link connection between the pin of the feeding-dog signal of MCU, hanging pin is connected, then the WDI pin of house dog is outstanding
It is empty；When outer triggering signal be high level, connect the feeding-dog signal of MCU pin, connect house dog WDI pin pin it
Between link connection.
Since the type of outer triggering signal is different, voltage is also different, executes effect to exclude voltage fluctuation to the present invention
The influence of fruit guarantees the safety of circuit, voltage decision circuitry is arranged between outer triggering signal and analog switch, to external trigger
Signal carries out voltage judgement.Outer triggering signal carries out voltage judgement by voltage decision circuitry, and exports switch-over control signal,
Analog switch carries out the switching of signal link by switch-over control signal.And the output of switch-over control signal is stable and controllable, energy
It is enough to be used as reliable control voltage.When outer triggering signal is low level, the switch-over control signal of voltage decision circuitry is high electricity
It is flat, the link connection between the pin of the feeding-dog signal of MCU, hanging pin is connected, then the WDI pin of house dog is hanging；When
Outer triggering signal is high level, and the switch-over control signal of voltage decision circuitry is low level, connects the pipe of the feeding-dog signal of MCU
Foot, connect house dog WDI pin pin between link connection.
Specifically, voltage decision circuitry is based on triode, the base stage of outer triggering signal connecting triode, and triode is penetrated
Pole ground connection, collector access MCU operating voltage, and switch-over control signal is picked out from collector；When outer triggering signal be low level,
Triode cut-off, switch-over control signal is high level, connects the link between the pin of the feeding-dog signal of MCU, hanging pin
Connection；When outer triggering signal is high level, triode ON, switch-over control signal is low level, connects the feeding-dog signal of MCU
Pin, connect house dog WDI pin pin between link connection.
In the present embodiment, MCU by taking SPC560B40L3 as an example, watchdog chip by taking PT7A7515WE as an example, analog switch with
For SGM3002, physical circuit design and model selection are as shown in Figure 2.SPC560B40L3 can not be in standby mode (i.e. STOP
Mode) under by RTC timer to PT7A7515WE do feed dog processing, i.e., offer feeding-dog signal.Disable WatchDog Timer
The implementation of function, can be when MCU be worked normally, and the WDI pin of house dog meets the feeding-dog signal pin TCK of MCU；MCU
Under STOP mode, the WDI pin of house dog is done into hanging processing.I.e. WDI pin realizes state switching, mould by analog switch
Quasi- switch is controlled by wake source.In the present embodiment, the outer triggering signal be vehicle ACC_IN level height,
Or the level height of the wake-up signal of other equipment terminal；As wake source is ACC signal or GSM communication module SIM800V
Wake up pin GSM_WAKE.
Under low-power consumption requirement, GSM_WAKE pin and ACC_IN pin are low level, triode cut-off, switching control letter
Number corresponding FADE_S pin is high level, then the COM1 pin of SGM3002 connects NO1 pin, is equivalent to PT7A7515WE's
WDI pin is hanging, and the timer function disability of PT7A7515WE, (preset to generate reset signal even more than 1.5 seconds at this time
Duration) reset signal will not be generated, SPC560B40L3 will not be resetted by hardware watchdog.
After GSM_WAKE pin or ACC_IN input high level, triode ON, FADE_S pin is low level, then
The COM1 pin of SGM3002 connects NC1 pin, is equivalent to the WDI pin of PT7A7515WE and the feeding-dog signal of SPC560B40L3
Pin TCK is connected, and the timer function of PT7A7515WE is enabled at this time, and the timer function of house dog restores, after wake-up
SPC560B40L3 generates feeding-dog signal, and watchdog chip counter empties, so that reset behaviour will not be carried out to SPC560B40L3
Make.
In the present embodiment, when the WDI pin of PT7A7515WE is hanging, 3.3V die terminals power consumption only has tens microamperes,
Meet low power dissipation design requirement.
Above-described embodiment is intended merely to illustrate the present invention, and is not used as limitation of the invention.As long as according to this hair
Bright technical spirit is changed above-described embodiment, modification etc. will all be fallen in the scope of the claims of the invention.
Claims (9)
1. the implementation method that a kind of hardware watchdog of mobile unit meets low-power consumption requirement, which is characterized in that touched by outside
The WDI pin for signaling to control house dog is hanging, or connects with the feeding-dog signal of MCU；When the WDI pin of house dog is hanging, see
The timer disability of door dog, house dog do not generate reset signal, and MCU keeps standby mode；MCU after wake-up, which is generated, feeds dog letter
Number, and the feeding-dog signal of the WDI pin connection MCU of house dog, enable the timer of house dog.
2. the hardware watchdog of mobile unit according to claim 1 meets the implementation method of low-power consumption requirement, feature
It is, switch is set between the TCK pin of WDI pin and MCU the transmission feeding-dog signal of house dog, passes through outer triggering signal
The on-off of control switch；When switch disconnects, WDI pin is hanging；When closing the switch, WDI pin is connected to TCK pin.
3. the hardware watchdog of mobile unit according to claim 2 meets the implementation method of low-power consumption requirement, feature
It is, the switch is analog switch, and the corresponding I/O pin of analog switch is separately connected hello the dog of outer triggering signal, MCU
Signal, house dog WDI pin, hanging；When outer triggering signal is low level, the pin, hanging of the feeding-dog signal of MCU is connected
Pin between link connection, then the WDI pin of house dog is hanging；When outer triggering signal be high level, connect MCU feed
Link connection between the pin of dog signal, the pin of the WDI pin of connection house dog.
4. the hardware watchdog of mobile unit according to claim 3 meets the implementation method of low-power consumption requirement, feature
It is, outer triggering signal carries out voltage judgement by voltage decision circuitry, and exports switch-over control signal, and analog switch passes through
The switching of switch-over control signal progress signal link；When outer triggering signal is low level, the switching control of voltage decision circuitry
Signal is high level, connects the link connection between the pin of the feeding-dog signal of MCU, hanging pin, then the WDI pipe of house dog
Foot is hanging；When outer triggering signal is high level, the switch-over control signal of voltage decision circuitry is low level, connects feeding for MCU
Link connection between the pin of dog signal, the pin of the WDI pin of connection house dog.
5. the hardware watchdog of mobile unit according to claim 1 meets the implementation method of low-power consumption requirement, feature
It is, the outer triggering signal is the electricity of the ACC_IN level height of vehicle or the wake-up signal of other equipment terminal
Flat height.
6. the circuit that a kind of hardware watchdog of mobile unit meets low-power consumption requirement, which is characterized in that the WDI pin of house dog
It is connect by switching with the feeding-dog signal of MCU, the reseting pin of house dog is connect with MCU；It is opened by outer triggering signal control
The on-off of pass, and then the WDI pin for controlling house dog is hanging, or connects with the feeding-dog signal of MCU；When switch disconnection, house dog
WDI pin it is hanging, the timer of house dog disability, house dog does not generate reset signal, and MCU keeps standby mode；After wake-up
MCU generate feeding-dog signal, when closing the switch, the feeding-dog signal of the WDI pin connection MCU of house dog, enabled house dog is determined
When device.
7. the circuit that the hardware watchdog of mobile unit according to claim 6 meets low-power consumption requirement, which is characterized in that
The switch be analog switch, the corresponding I/O pin of analog switch be separately connected outer triggering signal, MCU feeding-dog signal,
It is the WDI pin of house dog, hanging；When outer triggering signal be low level, connect pin, the hanging pipe of the feeding-dog signal of MCU
Link connection between foot, then the WDI pin of house dog is hanging；When outer triggering signal is high level, connect MCU feeds dog letter
Number pin, connect house dog WDI pin pin between link connection.
8. the circuit that the hardware watchdog of mobile unit according to claim 7 meets low-power consumption requirement, which is characterized in that
Voltage decision circuitry is set between outer triggering signal and analog switch, voltage judgement is carried out to outer triggering signal, and export
Switch-over control signal, analog switch carry out the switching of signal link by switch-over control signal.
9. the circuit that the hardware watchdog of mobile unit according to claim 8 meets low-power consumption requirement, which is characterized in that
Voltage decision circuitry is connect based on triode, the base stage of outer triggering signal connecting triode, the emitter grounding of triode, collector
Enter MCU operating voltage, switch-over control signal is picked out from collector；When outer triggering signal is low level, triode cut-off, switching
Control signal is high level, connects the link connection between the pin of the feeding-dog signal of MCU, hanging pin；Work as external trigger
Signal is high level, and triode ON, switch-over control signal is low level, connects the pin of the feeding-dog signal of MCU, connection is guarded the gate
Link connection between the pin of the WDI pin of dog.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810175567.0A CN110217184A (en) | 2018-03-02 | 2018-03-02 | The hardware watchdog of mobile unit meets the implementation method and circuit of low-power consumption requirement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810175567.0A CN110217184A (en) | 2018-03-02 | 2018-03-02 | The hardware watchdog of mobile unit meets the implementation method and circuit of low-power consumption requirement |
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| CN110217184A true CN110217184A (en) | 2019-09-10 |
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ID=67821956
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| CN201810175567.0A Pending CN110217184A (en) | 2018-03-02 | 2018-03-02 | The hardware watchdog of mobile unit meets the implementation method and circuit of low-power consumption requirement |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4835671A (en) * | 1986-09-19 | 1989-05-30 | Nippondenso Co., Ltd. | Communication control unit providing isolation of failure condition of electronic control unit |
| JP2003300438A (en) * | 2002-04-10 | 2003-10-21 | Nissan Shatai Co Ltd | Watchdog-monitoring apparatus |
| CN101281414A (en) * | 2007-04-07 | 2008-10-08 | 深圳迈瑞生物医疗电子股份有限公司 | Controllable watchdog replacement system |
| CN103246577A (en) * | 2012-02-01 | 2013-08-14 | 瑞萨电子株式会社 | Watchdog circuit, power IC and watchdog monitor system |
| CN106708642A (en) * | 2016-11-03 | 2017-05-24 | 深圳市博巨兴实业发展有限公司 | Watch dog timer used for MCU (Microprogrammed Control Unit) chip |
-
2018
- 2018-03-02 CN CN201810175567.0A patent/CN110217184A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4835671A (en) * | 1986-09-19 | 1989-05-30 | Nippondenso Co., Ltd. | Communication control unit providing isolation of failure condition of electronic control unit |
| JP2003300438A (en) * | 2002-04-10 | 2003-10-21 | Nissan Shatai Co Ltd | Watchdog-monitoring apparatus |
| CN101281414A (en) * | 2007-04-07 | 2008-10-08 | 深圳迈瑞生物医疗电子股份有限公司 | Controllable watchdog replacement system |
| CN103246577A (en) * | 2012-02-01 | 2013-08-14 | 瑞萨电子株式会社 | Watchdog circuit, power IC and watchdog monitor system |
| CN106708642A (en) * | 2016-11-03 | 2017-05-24 | 深圳市博巨兴实业发展有限公司 | Watch dog timer used for MCU (Microprogrammed Control Unit) chip |
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Application publication date: 20190910 |
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