Discrete watchdog circuit and electronic equipment

Abstract

The utility model discloses a discrete watchdog circuit and electronic equipment, and belongs to the technical field of power electronics. The discrete watchdog circuit is used for detecting whether a monitored object operates normally or not, and comprises a reset module which is electrically connected with a power supply, a reset signal receiving end of the monitored object and a ground wire; the dog feeding signal detection module is electrically connected with the dog feeding signal detection end of the monitored object, the reset module and the ground wire; and the watchdog function closing module is electrically connected with the enabling end of the monitored object, the dog feeding signal detection module and the ground wire respectively. According to the invention, the implementation cost of the watchdog reset function can be reduced.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a discrete watchdog circuit and electronic equipment. Background Art

[0002] As an important system protection mechanism, the watchdog circuit has been widely used in embedded systems, industrial automation, aerospace, military equipment, medical equipment, network servers and other fields. These fields have extremely high requirements for system reliability and stability. The watchdog circuit effectively ensures the normal operation of the system through its unique monitoring and reset functions.

[0003] Currently, the watchdog reset function is mostly implemented by an external watchdog chip, but the cost of the chip is relatively high, and if the external watchdog chip itself fails or is disturbed, the protection mechanism of the entire system may fail. Utility Model Content

[0004] The main purpose of the present application is to provide a discrete watchdog circuit and electronic equipment, aiming to reduce the implementation cost of the watchdog reset function.

[0005] To achieve the above object, the present application provides a discrete watchdog circuit, which is used to detect whether a monitored object is operating normally, and includes:

[0006] A reset module, the reset module being electrically connected to a power supply, a reset signal receiving terminal of the monitored object and a ground wire respectively;

[0007] a dog feeding signal detection module, the dog feeding signal detection module being electrically connected to the dog feeding signal detection terminal of the monitored object, the reset module and a ground wire;

[0008] A watchdog function shut-down module is electrically connected to the enable end of the monitored object, the dog feeding signal detection module and the ground wire.

[0009] In one embodiment, the reset module includes:

[0010] a first resistor, wherein a first end of the first resistor is electrically connected to the power supply, and a second end of the first resistor is electrically connected to the dog feeding signal detection module;

[0011] a first capacitor, wherein a first end of the first capacitor is electrically connected to a first end of the first resistor, and a second end of the first capacitor is grounded;

[0012] a second resistor, wherein a first end of the second resistor is electrically connected to a first end of the first capacitor, and a second end of the second resistor is electrically connected to a reset signal receiving end of the monitored object;

[0013] a second capacitor, wherein a first end of the second capacitor is electrically connected to a second end of the first resistor, and a second end of the second capacitor is grounded;

[0014] a voltage stabilizing diode, wherein a cathode of the voltage stabilizing diode is electrically connected to a first end of the second capacitor;

[0015] a third resistor, a first end of the third resistor being electrically connected to the anode of the voltage stabilizing diode, and a second end of the third resistor being grounded;

[0016] a third capacitor, wherein a first end of the third capacitor is electrically connected to the first end of the third resistor, and a second end of the third capacitor is grounded;

[0017] a fourth resistor, a first end of the fourth resistor being electrically connected to the first end of the third capacitor;

[0018] a fifth resistor, a first end of the fifth resistor being electrically connected to the second end of the fourth resistor, and a second end of the fifth resistor being grounded;

[0019] A first switch tube, wherein a controlled end of the first switch tube is electrically connected to a first end of the fifth resistor, a first end of the first switch tube is grounded, and a second end of the first switch tube is electrically connected to a reset signal receiving end of the monitored object.

[0020] In one embodiment, when the power supply is powered on, the third capacitor is charged, and when the voltage across the third capacitor reaches a preset threshold, the first switch tube is turned on, and the reset module outputs a reset signal to the reset signal receiving end of the monitored object.

[0021] In one embodiment, the dog feeding signal detection module includes:

[0022] a fourth capacitor, a first end of the fourth capacitor being electrically connected to a dog feeding signal detection end of the monitored object;

[0023] a sixth resistor, a first end of the sixth resistor being electrically connected to the first end of the fourth capacitor;

[0024] a seventh resistor, a first end of the seventh resistor being electrically connected to a second end of the sixth resistor;

[0025] a second switch tube, wherein a controlled end of the second switch tube is electrically connected to the second end of the fourth capacitor and the second end of the seventh resistor respectively, a first end of the second switch tube is grounded, and a second end of the second switch tube is electrically connected to the reset module;

[0026] an eighth resistor, a first end of the eighth resistor being electrically connected to the controlled end of the second switch tube, and a second end of the eighth resistor being grounded;

[0027] A parallel diode, wherein the anode of the parallel diode is grounded, and the cathode of the parallel diode is electrically connected to the first end of the eighth resistor.

[0028] In one embodiment, when the monitored object outputs a dog feeding signal, the second switch tube is turned on, and the reset module stops outputting the reset signal.

[0029] In one embodiment, when the monitored object stops outputting the dog feeding signal, the second switch tube is turned off, and the reset module outputs a reset signal after charging for a preset time.

[0030] In one embodiment, the watchdog function disabling module includes:

[0031] a ninth resistor, a first end of which is electrically connected to an enable end of the monitored object;

[0032] a tenth resistor, a first end of the tenth resistor being electrically connected to the second end of the ninth resistor, and a second end of the tenth resistor being grounded;

[0033] A third switch tube, wherein a controlled end of the third switch tube is electrically connected to the second end of the ninth resistor and the first end of the tenth resistor, the first end of the third switch tube is grounded, and the second end of the third switch tube is electrically connected to the dog feeding signal detection module.

[0034] In one embodiment, when the monitored object outputs an instruction to turn off the watchdog function, the third switch tube is turned on, and the watchdog feeding signal detection module and the reset module are bypassed.

[0035] In one embodiment, when the monitored object stops outputting instructions to turn off the watchdog function, the third switch tube is turned off, and the watchdog feeding signal detection module and the reset module work normally.

[0036] In addition, to achieve the above-mentioned purpose, the present application also provides an electronic device, which includes the discrete watchdog circuit as described above.

[0037] The present application proposes a discrete watchdog circuit and electronic device, which overcomes the problem that the watchdog reset function in the related art is mostly implemented by an external watchdog chip, resulting in high cost. The discrete watchdog circuit is used to detect whether the monitored object is operating normally, including: a reset module, the reset module is electrically connected to the power supply, the reset signal receiving end of the monitored object and the ground wire; a dog feeding signal detection module, the dog feeding signal detection module is electrically connected to the dog feeding signal detection end of the monitored object, the reset module and the ground wire; a watchdog function shutdown module, the watchdog function shutdown module is electrically connected to the enable end of the monitored object, the dog feeding signal detection module and the ground wire. The present application adopts discrete devices to form a watchdog circuit, which significantly reduces the design cost while realizing the functions of a traditional dedicated watchdog chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0039] Figure 1 A schematic diagram of the structure of a discrete watchdog circuit provided in an embodiment of the present application;

[0040] Figure 2 A schematic diagram of the structure of a reset module in a discrete watchdog circuit provided in an embodiment of the present application;

[0041] Figure 3 A schematic diagram of the structure of a dog feeding signal detection module in a discrete watchdog circuit provided in an embodiment of the present application;

[0042] Figure 4 A schematic diagram of the structure of a watchdog function shutoff module in a discrete watchdog circuit provided in an embodiment of the present application;

[0043] Figure 5 A logic waveform diagram of a discrete watchdog circuit provided in an embodiment of the present application;

[0044] Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0045] Description of Figure Numbers:

[0046] 10. Reset module; 20. Watchdog signal detection module; 30. Watchdog function shutdown module; GND, ground wire; DC_MCU_VCC, power supply; DC_RESET_MCU, reset signal receiving end of the monitored object; DC_WDI, watchdog signal detection end of the monitored object; DC_SET, enable end of the monitored object; R1~R10, first to tenth resistors; C1~C4, first to fourth capacitors; D1, voltage regulator diode; Q1~Q3, first to third switch tubes; D2, parallel diode.

[0047] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0049] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0050] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In addition, the meaning of "and / or" appearing in the full text is to include three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B.

[0051] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] It should also be understood that the references to "one embodiment" or "some embodiments" described in the specification of the embodiments of the present application mean that one or more embodiments of the embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0053] As an important system protection mechanism, the watchdog circuit has been widely used in embedded systems, industrial automation, aerospace, military equipment, medical equipment, network servers and other fields. These fields have extremely high requirements for system reliability and stability. The watchdog circuit effectively ensures the normal operation of the system through its unique monitoring and reset functions.

[0054] Currently, the watchdog reset function is mostly implemented by an external watchdog chip, but the cost of the chip is relatively high, and if the external watchdog chip itself fails or is disturbed, the protection mechanism of the entire system may fail.

[0055] Based on this, the embodiment of the present application proposes a discrete watchdog circuit and electronic device, which overcomes the problem that the watchdog reset function in the related art is mostly implemented by an external watchdog chip, resulting in high cost. The discrete watchdog circuit is used to detect whether the monitored object is operating normally, including: a reset module, the reset module is electrically connected to the power supply, the reset signal receiving end of the monitored object and the ground wire; a dog feeding signal detection module, the dog feeding signal detection module is electrically connected to the dog feeding signal detection end of the monitored object, the reset module and the ground wire; a watchdog function shutdown module, the watchdog function shutdown module is electrically connected to the enable end of the monitored object, the dog feeding signal detection module and the ground wire. The present application uses discrete devices to form a watchdog circuit, which significantly reduces the design cost while realizing the functions of a traditional dedicated watchdog chip.

[0056] The discrete watchdog circuit and electronic device provided in the embodiments of the present application are specifically described through the following embodiments, and the discrete watchdog circuit is first described.

[0057] The present application embodiment provides a discrete watchdog circuit, referring to Figure 1 , Figure 1A schematic diagram of a discrete watchdog circuit provided in an embodiment of the present application is provided. The discrete watchdog circuit is used to detect whether a monitored object is operating normally, and includes:

[0058] The reset module 10 is electrically connected to the power supply DC_MCU_VCC, the reset signal receiving terminal DC_RESET_MCU of the monitored object and the ground wire GND;

[0059] A dog feeding signal detection module 20, the dog feeding signal detection module 20 is electrically connected to the dog feeding signal detection terminal DC_WDI of the monitored object, the reset module 10 and the ground wire GND;

[0060] The watchdog function disabling module 30 is electrically connected to the enabling terminal DC_SET of the monitored object, the watchdog feeding signal detecting module 20 and the ground wire GND.

[0061] In this embodiment, the dog feeding signal detection module 20 is used to detect whether the monitored object outputs the dog feeding signal normally, the reset module 10 is used to control the reset of the monitored object when the dog feeding signal detection module 20 does not receive the dog feeding signal, and the watchdog function shutoff module 30 is used to bypass the dog feeding signal detection module 20 and the reset module 10 when receiving the instruction to shut down the watchdog function sent by the monitored object, thereby shutting down the watchdog function of the circuit.

[0062] Reference Figure 2 In some feasible embodiments, the reset module 10 includes:

[0063] A first resistor R1, a first end of the first resistor R1 is electrically connected to the power supply DC_MCU_VCC, and a second end of the first resistor R1 is electrically connected to the dog feeding signal detection module 20;

[0064] A first capacitor C1, a first end of the first capacitor C1 is electrically connected to a first end of the first resistor R1, and a second end of the first capacitor C1 is grounded;

[0065] a second resistor R2, wherein a first end of the second resistor R2 is electrically connected to a first end of the first capacitor C1, and a second end of the second resistor R2 is electrically connected to a reset signal receiving end DC_RESET_MCU of a monitored object;

[0066] A second capacitor C2, a first end of the second capacitor C2 is electrically connected to the second end of the first resistor R1, and a second end of the second capacitor C2 is grounded;

[0067] A voltage stabilizing diode D1, wherein a cathode of the voltage stabilizing diode D1 is electrically connected to a first end of a second capacitor C2;

[0068] A third resistor R3, a first end of the third resistor R3 is electrically connected to the anode of the voltage zener diode D1, and a second end of the third resistor R3 is grounded;

[0069] A third capacitor C3, a first end of the third capacitor C3 is electrically connected to a first end of a third resistor R3, and a second end of the third capacitor C3 is grounded;

[0070] a fourth resistor R4, wherein a first end of the fourth resistor R4 is electrically connected to a first end of the third capacitor C3;

[0071] a fifth resistor R5, wherein a first end of the fifth resistor R5 is electrically connected to a second end of the fourth resistor R4, and a second end of the fifth resistor R5 is grounded;

[0072] The first switch tube Q1 has a controlled end electrically connected to a first end of a fifth resistor R5, a first end of the first switch tube Q1 is grounded, and a second end of the first switch tube Q1 is electrically connected to a reset signal receiving end DC_RESET_MCU of a monitored object.

[0073] In this embodiment, the reset module 10 can be connected to a 5V power supply through the reset signal receiving terminal DC_RESET_MCU of the monitored object, or can be a power supply with other amplitudes, which is not limited in this embodiment.

[0074] In some feasible embodiments, when the power supply DC_MCU_VCC is powered on, the third capacitor C3 is charged. When the voltage across the third capacitor C3 reaches a preset threshold, the first switch tube Q1 is turned on, and the reset module 10 outputs a reset signal to the reset signal receiving terminal DC_RESET_MCU of the monitored object.

[0075] In this embodiment, when the power supply DC_MCU_VCC is powered on, the third capacitor C3 in the reset module 10 is continuously charged. When the charging voltage reaches a preset threshold, the first switch tube Q1 is turned on, and the reset module 10 sends a reset signal to the monitored object; wherein the preset threshold can be determined by changing the RC time constant of the first resistor R1 and the second capacitor C2, that is, by changing the charging time of the third capacitor C3.

[0076] Reference Figure 3 In some feasible embodiments, the dog feeding signal detection module 20 includes:

[0077] A fourth capacitor C4, a first end of the fourth capacitor C4 is electrically connected to a dog feeding signal detection end DC_WDI of the monitored object;

[0078] a sixth resistor R6, wherein a first end of the sixth resistor R6 is electrically connected to a first end of the fourth capacitor C4;

[0079] a seventh resistor R7, wherein a first end of the seventh resistor R7 is electrically connected to a second end of the sixth resistor R6;

[0080] A second switch tube Q2, wherein a controlled end of the second switch tube Q2 is electrically connected to a second end of the fourth capacitor C4 and a second end of the seventh resistor R7, a first end of the second switch tube Q2 is grounded, and a second end of the second switch tube Q2 is electrically connected to the reset module 10;

[0081] an eighth resistor R8, wherein a first end of the eighth resistor R8 is electrically connected to a controlled end of the second switch tube Q2, and a second end of the eighth resistor R8 is grounded;

[0082] A parallel diode D2 is connected, an anode of the parallel diode D2 is grounded, and a cathode of the parallel diode D2 is electrically connected to the first end of the eighth resistor R8.

[0083] In some feasible embodiments, when the monitored object outputs a dog feeding signal, the second switch tube Q2 is turned on, and the reset module 10 stops outputting the reset signal.

[0084] In some feasible embodiments, when the monitored object stops outputting the dog feeding signal, the second switch tube Q2 is turned off, and the reset module 10 outputs a reset signal after charging for a preset time.

[0085] In this embodiment, the dog feeding signal detection module 20 is connected to the dog feeding signal detection terminal DC_WDI of the monitored object. When the monitored object normally outputs the dog feeding signal, the second switch tube Q2 in the dog feeding detection module 20 is turned on. At this time, the third capacitor C3 in the reset module 10 is short-circuited, and the third capacitor C3 in the reset module 10 is discharged, so that the voltage across the third capacitor C3 is lower than the preset threshold value. At this time, the first switch tube Q1 is disconnected, and the reset module 10 does not output a reset signal; conversely, when the dog feeding signal detection module 20 does not detect the dog feeding signal output by the monitored object, the second switch tube Q2 is disconnected, and the voltage across the third capacitor C3 reaches the preset threshold value, which triggers the first switch tube Q1 to turn on, and then the reset module 10 will send a reset signal.

[0086] Reference Figure 4 In some feasible embodiments, the watchdog function shut down module 30 includes:

[0087] a ninth resistor R9, a first end of the ninth resistor R9 being electrically connected to an enable end DC_SET of the monitored object;

[0088] a tenth resistor R10, wherein a first end of the tenth resistor R10 is electrically connected to a second end of the ninth resistor R9, and a second end of the tenth resistor R10 is grounded;

[0089] The third switch tube Q3, the controlled end of the third switch tube Q3 is electrically connected to the second end of the ninth resistor R9 and the first end of the tenth resistor R10, the first end of the third switch tube Q3 is grounded, and the second end of the third switch tube Q3 is electrically connected to the dog feeding signal detection module 20.

[0090] In some feasible embodiments, when the monitored object outputs an instruction to turn off the watchdog function, the third switch tube Q3 is turned on, and the watchdog feeding signal detection module 20 and the reset module 10 are bypassed.

[0091] In some feasible embodiments, when the monitored object stops outputting instructions to turn off the watchdog function, the third switch tube Q3 is turned off, and the watchdog feeding signal detection module 20 and the reset module 10 work normally.

[0092] In this embodiment, the watchdog function shutdown module 30 is connected to the enable terminal DC_SET of the monitored object. When receiving an instruction to shut down the watchdog function sent by the monitored object, the third switch tube Q3 in the watchdog function shutdown module 30 is turned on. At this time, the watchdog circuit composed of the dog feeding signal detection module 20 and the reset module 10 is bypassed and disconnected from the monitored object; conversely, when the watchdog function shutdown module 30 does not receive an instruction to shut down the watchdog function sent by the monitored object, the third switch tube Q3 in the watchdog function shutdown module 30 is turned off, and the watchdog function shutdown module 30 does not affect the normal operation of the watchdog circuit composed of the dog feeding signal detection module 20 and the reset module 10.

[0093] As an example, the watchdog control logic provided in the above embodiment can be combined with Figure 5 To understand, by Figure 5 It can be seen from the waveform in that: after the rising edge of the DC_WDI signal is issued, the third capacitor C3 is discharged once and then starts to charge (determined by the RC time constant); after the third capacitor C3 is charged to a certain voltage; the DC_RESET_MCU signal is reset at a low level.

[0094] This embodiment provides a discrete watchdog circuit. By using discrete devices to form the watchdog circuit, the design cost is significantly reduced while realizing the functions of a traditional dedicated watchdog chip.

[0095] In addition, the present application also provides an electronic device, referring to Figure 6 , the electronic device includes the discrete watchdog circuit provided in the above embodiment.

[0096] Since the electronic device proposed in this embodiment includes the discrete watchdog circuit proposed in the above embodiments, it has the beneficial effects of the above embodiments. The specific working process and principle of the discrete watchdog circuit are detailed in the discrete watchdog circuits provided in the above embodiments, which will not be described one by one here, and are all within the protection scope of this embodiment.

[0097] It should be noted that the technical solutions of the various embodiments of the present application can be combined with each other, but it must be based on the fact that they can be implemented by technical personnel in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0098] The above are only optional embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A discrete watchdog circuit, characterized in that: The discrete watchdog circuit is used to detect whether the monitored object is operating normally, and includes: A reset module, the reset module being electrically connected to a power supply, a reset signal receiving terminal of the monitored object and a ground wire respectively; a dog feeding signal detection module, the dog feeding signal detection module being electrically connected to the dog feeding signal detection terminal of the monitored object, the reset module and a ground wire; A watchdog function shut-down module is electrically connected to the enable end of the monitored object, the dog feeding signal detection module and the ground wire.

2. The discrete watchdog circuit according to claim 1, characterized in that: The reset module comprises: a first resistor, wherein a first end of the first resistor is electrically connected to the power supply, and a second end of the first resistor is electrically connected to the dog feeding signal detection module; a first capacitor, wherein a first end of the first capacitor is electrically connected to a first end of the first resistor, and a second end of the first capacitor is grounded; a second resistor, wherein a first end of the second resistor is electrically connected to a first end of the first capacitor, and a second end of the second resistor is electrically connected to a reset signal receiving end of the monitored object; a second capacitor, wherein a first end of the second capacitor is electrically connected to a second end of the first resistor, and a second end of the second capacitor is grounded; a voltage stabilizing diode, wherein a cathode of the voltage stabilizing diode is electrically connected to a first end of the second capacitor; a third resistor, a first end of the third resistor being electrically connected to the anode of the voltage stabilizing diode, and a second end of the third resistor being grounded; a third capacitor, wherein a first end of the third capacitor is electrically connected to the first end of the third resistor, and a second end of the third capacitor is grounded; a fourth resistor, a first end of the fourth resistor being electrically connected to the first end of the third capacitor; a fifth resistor, a first end of the fifth resistor being electrically connected to the second end of the fourth resistor, and a second end of the fifth resistor being grounded; A first switch tube, wherein a controlled end of the first switch tube is electrically connected to a first end of the fifth resistor, a first end of the first switch tube is grounded, and a second end of the first switch tube is electrically connected to a reset signal receiving end of the monitored object.

3. The discrete watchdog circuit according to claim 2, characterized in that: When the power supply is powered on, the third capacitor is charged. When the voltage across the third capacitor reaches a preset threshold, the first switch tube is turned on, and the reset module outputs a reset signal to the reset signal receiving end of the monitored object.

4. The discrete watchdog circuit according to claim 1, characterized in that: The dog feeding signal detection module comprises: a fourth capacitor, a first end of the fourth capacitor being electrically connected to a dog feeding signal detection end of the monitored object; a sixth resistor, a first end of the sixth resistor being electrically connected to the first end of the fourth capacitor; a seventh resistor, a first end of the seventh resistor being electrically connected to a second end of the sixth resistor; a second switch tube, wherein a controlled end of the second switch tube is electrically connected to the second end of the fourth capacitor and the second end of the seventh resistor respectively, a first end of the second switch tube is grounded, and a second end of the second switch tube is electrically connected to the reset module; an eighth resistor, a first end of the eighth resistor being electrically connected to the controlled end of the second switch tube, and a second end of the eighth resistor being grounded; A parallel diode, wherein the anode of the parallel diode is grounded, and the cathode of the parallel diode is electrically connected to the first end of the eighth resistor.

5. The discrete watchdog circuit according to claim 4, characterized in that: When the monitored object outputs a dog feeding signal, the second switch tube is turned on, and the reset module stops outputting the reset signal.

6. The discrete watchdog circuit according to claim 4, characterized in that: When the monitored object stops outputting the dog feeding signal, the second switch tube is turned off, and the reset module outputs a reset signal after charging for a preset time.

7. The discrete watchdog circuit according to claim 1, wherein: The watchdog function shut down module comprises: a ninth resistor, a first end of the ninth resistor being electrically connected to an enable end of the monitored object; a tenth resistor, a first end of the tenth resistor being electrically connected to the second end of the ninth resistor, and a second end of the tenth resistor being grounded; A third switch tube, wherein a controlled end of the third switch tube is electrically connected to the second end of the ninth resistor and the first end of the tenth resistor, the first end of the third switch tube is grounded, and the second end of the third switch tube is electrically connected to the dog feeding signal detection module.

8. The discrete watchdog circuit according to claim 7, characterized in that: When the monitored object outputs an instruction to turn off the watchdog function, the third switch tube is turned on, and the watchdog feeding signal detection module and the reset module are bypassed.

9. The discrete watchdog circuit according to claim 7, characterized in that: When the monitored object stops outputting instructions to turn off the watchdog function, the third switch tube is turned off, and the watchdog feeding signal detection module and the reset module work normally.

10. An electronic device, characterized in that: The electronic device comprises a discrete watchdog circuit as claimed in any one of claims 1 to 9.

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