1. The detection device is characterized in that the input end of the detection device is connected with the PWM output end of an SoC system-level chip of vehicle-mounted equipment, and the output end of the detection device is connected with a power management chip of the vehicle-mounted equipment; the detection device comprises: the device comprises a detection module, a notification module and a first capacitance unit; the output end of the detection module is connected with the first capacitor unit, and the first capacitor unit is also connected with the input end of the notification module;

the detection module is used for responding to the occurrence of a target edge signal at the input end of the detection module, and charging the first capacitor unit through the output end of the detection module within a preset time period after the occurrence of the target edge signal; wherein the first capacitor unit is discharged without being charged; the target edge signal comprises a rising edge signal or a falling edge signal;

the notification module is configured to detect a voltage across the first capacitor unit, set the output terminal of the notification module to a first state when the voltage across the first capacitor unit is greater than a threshold voltage, and set the output terminal of the notification module to a second state when the voltage across the first capacitor unit is less than the threshold voltage.

2. The detection device according to claim 1, wherein the detection module comprises a coupling unit, an amplifying unit and a filtering unit; wherein: the input end of the coupling unit is connected with the input end of the detection module, the output end of the coupling unit is connected with the input end of the amplifying unit, the output end of the amplifying unit is connected with the input end of the filtering unit, and the output end of the filtering unit is connected with the output end of the detection module; the output end of the detection module is connected with the first end of the first capacitor unit, and the second end of the first capacitor unit is connected with a reference potential point;

the coupling unit is used for extracting an edge signal from the electric signal at the input end of the detection module, raising the reference voltage of the edge signal to a target voltage, and outputting the obtained electric signal from the output end of the coupling unit;

the amplifying unit is used for amplifying the electric signal at the input end of the amplifying unit and outputting the obtained electric signal from the output end of the amplifying unit;

and the filtering unit is used for filtering the electric signal at the input end of the filtering unit and outputting the obtained electric signal from the output end of the filtering unit.

3. The detecting device according to claim 2, wherein the coupling unit comprises a second capacitance unit, a first resistance unit, a second resistance unit; wherein:

one end of the second capacitor unit is connected with the input end of the coupling unit, and the other end of the second capacitor unit is connected with the output end of the coupling unit;

the first end of the first resistance unit is connected with a first direct current power supply, and the second end of the first resistance unit is connected with the first end of the second resistance unit and the output end of the coupling unit;

and the second end of the second resistance unit is connected with a reference potential point.

4. The detecting device for detecting the rotation of a motor rotor according to claim 3, wherein the amplifying unit comprises a constant current source, a voltage stabilizing diode and an operational amplifier; wherein:

one end of the constant current source is connected with a second direct current power supply, and the other end of the constant current source is connected with the negative input end of the operational amplifier;

the cathode of the voltage stabilizing diode is connected with the negative electrode input end of the operational amplifier, and the anode of the voltage stabilizing diode is connected with a reference potential point;

the positive input end of the operational amplifier is connected with the input end of the amplifying unit;

the output end of the operational amplifier is connected with the output end of the amplifying unit.

5. The detection device according to claim 4, wherein the filter unit comprises a preset diode;

the anode of the preset diode is connected with the input end of the filtering unit, and the cathode of the preset diode is connected with the output end of the filtering unit.

6. The detecting device according to claim 5, wherein the resistance R1 of the first resistance unit and the resistance R2 of the second resistance unit satisfy the following formula one:

wherein VDD represents a voltage value of the first DC power supply, V_refThe negative input terminal voltage of the operational amplifier is shown.

7. The detection device according to claim 2, wherein the notification module comprises a control unit and a preset triode;

the input end of the control unit is connected with the input end of the notification module, the output end of the control unit is connected with the base electrode of the preset triode, the collector electrode of the preset triode is connected with the output end of the notification module, and the emitter electrode of the preset triode is connected with a reference potential point;

the control unit is used for controlling the preset triode to be in a conducting state when the voltage of the input end of the control unit is greater than the threshold voltage; and when the voltage of the input end of the control unit is smaller than the threshold voltage, controlling the preset triode to be in a cut-off state.

8. The detection device according to claim 7, wherein the control unit comprises: presetting a trigger, a third resistor and a fourth resistor;

the input end of the preset trigger is connected with the input end of the control unit, and the output end of the preset trigger is connected with the first end of the third resistor;

the second end of the third resistor is connected with the base electrode of the preset triode;

one end of the fourth resistor is connected with the base electrode of the preset triode, and the other end of the fourth resistor is connected with a reference potential point.

9. An in-vehicle device comprising a SoC, a power management chip and a detection apparatus as provided in any one of claims 1 to 8; wherein:

the input end of the detection device is connected with the PWM output end of the SoC, and the output end of the detection device is connected with the power management chip.

Background

In an on-board System, the SoC (System on Chip) may be in an abnormal operation state (for example, when an engine is started, the voltage of an on-board battery is often unstable; for example, when the SoC has an inappropriate program setting, the SoC may also be in a halt state). At this time, if the abnormal state of the SoC can be detected in time, the SoC can be recovered to normal by adjusting the power supply of the SoC. Or if the abnormal state of the SoC can be detected in time, measures can be taken to avoid the abnormal state of other electronic equipment controlled by the SoC.

Disclosure of Invention

The embodiment of the application provides a detection device and vehicle-mounted equipment, which are used for detecting the abnormal operation state of an SoC.

In a first aspect, the present application provides a detection apparatus, an input end of the detection apparatus is connected to a PWM output end of an SoC of a vehicle-mounted device, and an output end of the detection apparatus is connected to a power management chip of the vehicle-mounted device; the detection device comprises: the device comprises a detection module, a notification module and a first capacitance unit; the output end of the detection module is connected with the first capacitor, and the first capacitor is also connected with the input end of the notification module; the detection module is used for responding to the occurrence of a target edge signal at the input end of the detection module, and charging the first capacitor unit through the output end of the detection module within a preset time period after the occurrence of the target edge signal; wherein the first capacitor unit is discharged without being charged; the target edge signal comprises a rising edge signal or a falling edge signal; the notification module is configured to detect a voltage across the first capacitor, set the output terminal of the notification module to a first state when the voltage across the first capacitor is greater than a threshold voltage, and set the output terminal of the notification module to a second state when the voltage across the first capacitor is less than the threshold voltage.

Optionally, the detection module includes a coupling unit, an amplifying unit, and a filtering unit; wherein: the input end of the coupling unit is connected with the input end of the detection module, the output end of the coupling unit is connected with the input end of the amplifying unit, the output end of the amplifying unit is connected with the input end of the filtering unit, and the output end of the filtering unit is connected with the output end of the detection module; the output end of the detection module is connected with the first end of the first capacitor unit, and the second end of the first capacitor unit is connected with a reference potential point;

the coupling unit is used for extracting an edge signal from the electric signal at the input end of the detection module, raising the reference voltage of the edge signal to a target voltage, and outputting the obtained electric signal from the output end of the coupling unit;

the amplifying unit is used for amplifying the electric signal at the input end of the amplifying unit and outputting the obtained electric signal from the output end of the amplifying unit;

and the filtering unit is used for filtering the electric signal at the input end of the filtering unit and outputting the obtained electric signal from the output end of the filtering unit.

Optionally, the coupling unit includes a second capacitor unit, a first resistor unit, and a second resistor unit; wherein:

one end of the second capacitor unit is connected with the input end of the coupling unit, and the other end of the second capacitor unit is connected with the output end of the coupling unit;

the first end of the first resistance unit is connected with a first direct current power supply, and the second end of the first resistance unit is connected with the first end of the second resistance unit and the output end of the coupling unit;

and the second end of the second resistance unit is connected with a reference potential point.

Optionally, the amplifying unit includes a constant current source, a zener diode, and an operational amplifier; wherein:

one end of the constant current source is connected with a second direct current power supply, and the other end of the constant current source is connected with the negative input end of the operational amplifier;

the cathode of the voltage stabilizing diode is connected with the negative electrode input end of the operational amplifier, and the anode of the voltage stabilizing diode is connected with a reference potential point;

the positive input end of the operational amplifier is connected with the input end of the amplifying unit;

the output end of the operational amplifier is connected with the output end of the amplifying unit.

Optionally, the resistance value R1 of the first resistance unit and the resistance value R2 of the second resistance unit satisfy the following formula one:

wherein VDD represents a voltage value of the first DC power supply, V_refThe negative input terminal voltage of the operational amplifier is shown.

Optionally, the filtering unit includes a preset diode;

the anode of the preset diode is connected with the input end of the filtering unit, and the cathode of the preset diode is connected with the output end of the filtering unit.

Optionally, the notification module includes a control unit and a preset triode;

the input end of the control unit is connected with the input end of the notification module, the output end of the control unit is connected with the base electrode of the preset triode, the collector electrode of the preset triode is connected with the output end of the notification module, and the emitter electrode of the preset triode is connected with a reference potential point;

the control unit is used for controlling the preset triode to be in a conducting state when the voltage of the input end of the control unit is greater than the threshold voltage; and when the voltage of the input end of the control unit is smaller than the threshold voltage, controlling the preset triode to be in a cut-off state.

Optionally, the control unit includes: presetting a trigger, a third resistor and a fourth resistor;

the input end of the preset trigger is connected with the input end of the control unit, and the output end of the preset trigger is connected with the first end of the third resistor;

the second end of the third resistor is connected with the base electrode of the preset triode;

one end of the fourth resistor is connected with the base electrode of the preset triode, and the other end of the fourth resistor is connected with a reference potential point.

In a second aspect, the present application provides an on-board device, including an SoC system-on-chip, a power management chip, and the detection apparatus provided in the first aspect; wherein: the input end of the detection device is connected with the PWM output end of the SoC, and the output end of the detection device is connected with the power management chip.

The application provides a detection device and mobile unit, consider that present SoC chip can pass through PWM output PWM signal at the during operation, when SoC chip abnormal operation, the condition of abnormal output also can take place for the PWM signal of output. Therefore, in the present application, the detection module in the detection device detects the PWM signal output by the SoC chip, and charges the first capacitor unit once each time a rising edge signal or a falling edge signal is detected. Therefore, when the SoC chip normally outputs the PWM signal, the detection module periodically charges the first capacitor unit, so that the voltage across the first capacitor unit is maintained above the threshold voltage. When the SoC chip cannot output the PWM signal, the first capacitor unit discharges to decrease the voltage between the two terminals. And then, detecting the voltage at two ends of a first capacitor unit through a notification module, setting the output end of the notification module to be in a first state when the voltage at two ends of the first capacitor is greater than a threshold voltage, and setting the output end of the notification module to be in a second state when the voltage at two ends of the first capacitor is less than the threshold voltage. Furthermore, when the output end of the notification module is in the second state, the SoC chip can be determined to have a fault. And then the power management chip can perform corresponding processing when detecting that the output end of the notification module is in the second state.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an on-board device according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a detection apparatus according to an embodiment of the present disclosure;

fig. 3 is a second schematic structural diagram of a detection apparatus according to an embodiment of the present application;

FIG. 4 is a schematic diagram of a signal timing sequence provided by an embodiment of the present application;

fig. 5 is a third schematic structural diagram of a detection apparatus according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first" and "second," and the like, in the description and in the claims of the present application, are used for distinguishing between different objects and not for describing a particular order of the objects. For example, the first resistor and the second resistor, etc. are used to distinguish between different resistors, rather than to describe a particular order of resistors.

In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion. Further, in the description of the embodiments of the present application, the meaning of "a plurality" means two or more unless otherwise specified.

First, the inventive concept of the present application is introduced:

in the prior art, in a vehicle-mounted System, an SoC (System on Chip) may have an abnormal operation state (for example, when an engine is started, the voltage of a vehicle-mounted storage battery is often unstable, and for example, when the program setting of the SoC is not proper, the SoC may also enter a halt state). When the SoC is in an abnormal operation state, other devices controlled by the SoC may also be abnormal, and in severe cases, the personal and property safety of people in the vehicle may be endangered.

Therefore, in the present application, it is considered that if the abnormal state of the SoC can be detected in time, the SoC can be recovered to be normal by adjusting the power supply of the SoC. Or if the abnormal state of the SoC can be detected in time, measures can be taken to avoid the abnormal state of other electronic equipment controlled by the SoC.

Furthermore, considering that the SoC chip outputs the PWM signal through the PWM output terminal when operating, and when the SoC chip operates abnormally, the output PWM signal is also output abnormally. Therefore, the abnormal state of the SoC can be detected by detecting the abnormal state of the PWM signal. Furthermore, in the present application, the detection module in the detection device detects the PWM signal output by the SoC chip, and charges the first capacitor unit once each time a rising edge signal or a falling edge signal is detected. Therefore, when the SoC chip normally outputs the PWM signal, the detection module periodically charges the first capacitor unit, so that the voltage across the first capacitor unit is maintained above the threshold voltage. When the SoC chip cannot output the PWM signal, the first capacitor unit discharges to decrease the voltage between the two terminals. Furthermore, the notification module detects the voltage at the two ends of the first capacitor unit, the output end of the notification module is set to be in a first state when the voltage at the two ends of the first capacitor is greater than the threshold voltage, and the output end of the notification module is set to be in a second state when the voltage at the two ends of the first capacitor is less than the threshold voltage. Furthermore, when the output end of the notification module is in the second state, the SoC chip can be determined to have a fault. And then the power management chip can perform corresponding processing when detecting that the output end of the notification module is in the second state.

The technical scheme provided by the application is described by combining the following examples:

the first embodiment is as follows:

based on the inventive concept, the embodiment of the application provides a detection device, which is applied to vehicle-mounted equipment. Fig. 1 is a schematic structural diagram of an in-vehicle device according to the present application. Wherein, the in-vehicle apparatus 10 includes: SoC101, power management chip 102, and detection device 103. The PWM terminal of the SoC101 is connected to the input terminal of the detection device 103, and the output terminal of the detection device 103 is connected to the power management chip 102. The SoC101 is used for controlling the operation state of the electronic device on the vehicle, and the PWM terminal of the SoC101 outputs a PWM signal during normal operation. The power management chip 102 is used to control the power of the electronic devices on the vehicle. The detection device 103 is configured to operate according to the technical solution provided in the present application, so as to achieve the beneficial effects of the present application.

As shown in fig. 2, the detection device 103 specifically includes: a detection module 1031, a notification module 1032, and a first capacitance unit C1.

The output terminal of the detection module 1031 is connected to the first capacitor unit C1, and the first capacitor unit C1 is further connected to the input terminal of the notification module 1032.

A detection module 1031, configured to, in response to occurrence of a target edge signal at an input terminal of the detection module 1031, charge C1 to the first capacitance unit through an output terminal of the detection module 1031 within a preset time period after the occurrence of the target edge signal.

Here, the first capacitor unit C1 is discharged without being charged.

In addition, the target edge signal may specifically include a rising edge signal or a falling edge signal.

The notification module 1032 is configured to detect a voltage across the first capacitor unit C1, set the output terminal of the notification module 1032 to be in a first state when the voltage across the first capacitor unit C1 is greater than a threshold voltage, and set the output terminal of the notification module 1032 to be in a second state when the voltage across the first capacitor unit C1 is less than the threshold voltage.

In the application, the PWM signal output by the SoC chip is detected through a detection module in the detection device, and the first capacitor unit is charged once when a rising edge signal or a falling edge signal is detected each time. Therefore, when the SoC chip normally outputs the PWM signal, the detection module periodically charges the first capacitor unit, so that the voltage across the first capacitor unit is maintained above the threshold voltage. When the SoC chip cannot output the PWM signal, the first capacitor unit discharges to decrease the voltage between the two terminals. Furthermore, the notification module detects the voltage at the two ends of the first capacitor unit, the output end of the notification module is set to be in a first state when the voltage at the two ends of the first capacitor is greater than the threshold voltage, and the output end of the notification module is set to be in a second state when the voltage at the two ends of the first capacitor is less than the threshold voltage. Furthermore, when the output end of the notification module is in the second state, the SoC chip can be determined to have a fault. And then the power management chip can perform corresponding processing when detecting that the output end of the notification module is in the second state.

In one implementation, as shown in fig. 3, the detection module 1031 includes a coupling unit 10311, an amplifying unit 10312, and a filtering unit 10313.

Wherein, an input end of the coupling unit 10311 is connected to an input end of the detection module 1031, an output end of the coupling unit 10311 is connected to an input end of the amplification unit 10312, an output end of the amplification unit 10312 is connected to an input end of the filtering unit 10313, and an output end of the filtering unit 10313 is connected to an output end of the detection module 1031; an output terminal of the detection module 1031 is connected to a first terminal of the first capacitor unit C1, and a second terminal of the first capacitor unit C1 is connected to a reference potential point.

The coupling unit 10311 is configured to extract an edge signal from the electrical signal at the input terminal of the detection module 1031, raise a reference voltage of the edge signal to a target voltage, and output the obtained electrical signal from the output terminal of the coupling unit 10311.

And an amplifying unit 10312, configured to amplify the electrical signal at the input end of the amplifying unit 10312, and output the obtained electrical signal from the output end of the amplifying unit 10312.

A filtering unit 10313, configured to filter the electrical signal at the input end of the filtering unit 10313 and output the obtained electrical signal from the output end of the filtering unit 10313.

In the application, the PWM signal output by the SoC chip is considered to be generally lower in voltage, the extracted edge signal is weak, and the rear-side circuit is difficult to drive. Therefore, the edge signal is amplified by the amplification unit 10312 in the present application. In addition, in order to avoid interference, in the present application, before amplifying the edge signal, the coupling unit 10311 first boosts the reference voltage of the edge signal after extracting the edge signal, so as to boost the reference voltage of the edge signal to the target voltage.

Illustratively, the PWM signal output by SoC101 is shown in fig. 4 (a). Then, by extracting the edge signal in the PWM signal, a signal is obtained as shown in (b) of fig. 4. Then by lifting (e.g., by 1.5V), a signal is obtained as shown in fig. 4 (c). Then, by amplification, a signal is obtained as shown in (d) in fig. 4. Then, the signal obtained by filtering is shown in fig. 4 (e).

In one implementation, the coupling unit 10311 includes a second capacitor unit C2, a first resistor unit R1, and a second resistor unit R2. Wherein:

one end of the second capacitor unit C2 is connected to the input terminal of the coupling unit 10311, and the other end is connected to the output terminal of the coupling unit 10311.

The first end of the first resistor unit R1 is connected to the first dc power source VDD, and the second end is connected to the first end of the second resistor unit R2 and the output end of the coupling unit 10311.

A second terminal of the second resistance unit R2 is connected to a reference potential point.

It should be noted that, the capacitor unit and the resistor unit referred to in the present application may specifically be independently packaged capacitors and resistor elements; the integrated circuit may have a capacitor or a resistor characteristic in which a plurality of elements are connected in series or in parallel. The present application is not limited thereto.

Further, in one implementation, the amplifying unit 10312 includes a constant current source CCS, a zener diode D1, and an operational amplifier OA. Wherein:

one end of the constant current source CCS is connected to the second dc power supply. The second dc power source may be the same as the first dc power source, as shown in fig. 5. In addition, the second dc power supply may be a different power supply from the first dc power supply, and the present application is not limited thereto.

The other end of the constant current source CCS is connected to the negative input terminal of the operational amplifier OA.

The cathode of the zener diode D1 is connected to the negative input terminal of the operational amplifier OA, and the anode is connected to the reference potential point.

The positive input terminal of the operational amplifier OA is connected to the input terminal of the amplifying unit 10312.

An output terminal of the operational amplifier OA is connected to an output terminal of the amplifying unit 10312.

In addition, as shown in fig. 5, in one implementation, the filtering unit 10313 includes a preset diode D2.

An anode of the preset diode D2 is connected to the input terminal of the filter unit 10313, and a cathode of the preset diode D2 is connected to the output terminal of the filter unit 10313.

In addition, in order to filter the falling edge signal through the preset diode D2 in the above implementation, in the present application, the resistance value R1 of the first resistor unit R1 and the resistance value R2 of the second resistor unit R2 satisfy the following formula one:

where VDD denotes a voltage value of the first DC power supply VDD, V_refThe negative input terminal voltage of the operational amplifier is shown.

By making the resistance value R1 of the first resistor unit R1 and the resistance value R2 of the second resistor unit R2 satisfy the above equation one, the portion of the falling edge signal in the output signal of the amplifier OA is in the negative voltage region. For example, if(i.e., R1 and R2 divide VDD, with a voltage division of 1.5V over R2). Positive input of the amplifier OAThe voltage at the input terminal is shown in fig. 4 (c). Further, the voltage V at the negative input terminal of the amplifier OA is controlled_refGreater than 1.5V, e.g. V_ref1.6V. The output voltage of the amplifier OA is then as shown in fig. 4 (d). Then, the falling edge signal can be completely filtered out by presetting the diode D2, as shown in fig. 4 (e).

In addition, as shown in fig. 5, in one implementation, the notification module 1032 includes a control unit 10321 and a preset transistor Q1.

An input end of the control unit 10321 is connected to an input end of the notification module 1032, an output end of the control unit 10321 is connected to a base electrode of the preset triode Q1, a collector electrode of the preset triode Q1 is connected to an output end of the notification module 1032, and an emitter electrode of the preset triode Q1 is connected to a reference potential point.

The control unit 10321 is configured to control the preset transistor Q1 to be in a conducting state when the voltage at the input terminal of the control unit 10321 is greater than the threshold voltage; when the voltage of the input terminal of the control unit 10321 is smaller than the threshold voltage, the preset transistor Q1 is controlled to be in a cut-off state.

Optionally, the control unit 10321 includes: the trigger BF is preset, and the trigger R3 and the resistor R4 are preset.

The input terminal of the preset trigger BF is connected to the input terminal of the control unit 10321, and the output terminal of the preset trigger BF is connected to the first terminal of the third resistor R3.

The second terminal of the third resistor R3 is connected to the base of the preset transistor Q1.

One end of the fourth resistor R4 is connected to the base of the preset transistor Q1, and the other end of the fourth resistor R4 is connected to the reference potential point.

The following describes the operation of the detecting device 103 shown in fig. 5 in this application with reference to practical scenarios:

1. when the SoC chip works normally.

The SoC outputs a PWM signal (e.g., as shown in fig. 4 (a)). The capacitor C2 filters out the dc component in the PWM signal to generate a sawtooth signal with the same frequency. The resistors R1 and R2 constitute a voltage divider circuit, and add a dc component to the sawtooth signal (as shown in fig. 4 (c)) and output the resultant signal to the positive input terminal of the operational amplifier OA. For example, when VDD is 3V, R1 and R2 are equal. The sawtooth signal is then raised by 1.5V.

The voltage at the negative input of the operational amplifier OA is clamped at 1.6V by the constant current source CCS and the zener diode D1.

Therefore, the output terminal of the operational amplifier OA amplifies and outputs the sawtooth wave signal, and the waveform is outputted as shown in fig. 4 (d).

Then, through diode D2, the rising edge signal is extracted and the falling edge signal is masked. The waveform after passing through the diode D2 is shown in fig. 4 (e).

Then, by using the charging and discharging process of the capacitor C1 (if the capacitor C1 is not charged within the preset time period, the capacitor C2 is discharged to 0V), when the SoC outputs the PWM signal normally, the capacitor C1 is charged when the rising edge of each PWM signal is generated, so that the input terminal of the flip-flop BF always maintains a high level signal. Then, the input terminal of the flip-flop BF will output a low level signal (or float) after receiving the high level signal, and the transistor Q1 is in the off state, so that the collector of the transistor Q1 is floating, and the detection device 103 does not output a signal at this time.

2. When the SoC chip operates abnormally.

When the SoC chip continuously outputs a high level, continuously outputs a low level or the PWM signal is out of order, the capacitor C1 is not charged in time, so that the voltage at the input end of the trigger BF will reach 0V, and the trigger BF outputs a high level signal, so that the collector of the triode Q1 outputs a low level. After the power management chip receives the low level, the abnormal state of the SoC chip can be known.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above-mentioned embodiments, objects, technical solutions and advantages of the present application are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present application, and are not intended to limit the scope of the present application, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present application should be included in the scope of the present application.