CN219918395U

CN219918395U - Power supply monitoring circuit, chip and electronic equipment

Info

Publication number: CN219918395U
Application number: CN202320908143.7U
Authority: CN
Inventors: 袁德一; 王世好
Original assignee: Hefei Chipsea Electronics Technology Co Ltd
Current assignee: Hefei Chipsea Electronics Technology Co Ltd
Priority date: 2023-04-18
Filing date: 2023-04-18
Publication date: 2023-10-27
Anticipated expiration: 2033-04-18

Abstract

The utility model relates to the technical field of integrated circuits, in particular to a power supply monitoring circuit, a chip and electronic equipment.

Description

Power supply monitoring circuit, chip and electronic equipment

Technical Field

The present utility model relates to the field of integrated circuits, and in particular, to a power supply monitoring circuit, a chip, and an electronic device.

Background

At present, a Power On Reset (POR) circuit or a Power off Reset (PDR) circuit is generally adopted by a Power supply monitoring circuit to monitor each operation stage of the functional circuit, and when the voltage is smaller than a preset threshold voltage, the voltage is determined to be abnormal, and the Reset is directly carried out. In the power supply monitoring circuit in the prior art, since only one fixed preset threshold value exists, whether voltage abnormality occurs or not can be determined according to the preset threshold value in different operation stages, and reset response can be only made when the voltage abnormality occurs, and when the preset threshold voltage of the power supply monitoring circuit is unreasonable or other reasons cause abnormal voltage signals for representing the preset threshold voltage, the reset response can not be made to the voltage abnormality. Therefore, the power supply monitoring circuit in the prior art cannot effectively monitor the power supply, which is unfavorable for improving the operation reliability and the safety.

Disclosure of Invention

In view of the above problems, embodiments of the present utility model provide a power supply monitoring circuit, a chip and an electronic device, so as to solve the above technical problems.

In a first aspect, an embodiment of the present utility model provides a power supply monitoring circuit, including:

a first reset circuit for generating a first reset signal or releasing the first reset signal;

the first detection circuit is connected with the first reset circuit so as to output a first monitoring feedback signal when the first reset threshold voltage is smaller than the first working threshold voltage;

and the detection control circuit is used for generating an interrupt control signal when the power supply voltage is smaller than the second control threshold voltage after the first reset signal is released.

Optionally, the power supply monitoring circuit further includes a second detection circuit outputting a second monitoring feedback signal when the second control threshold voltage is smaller than a second operation threshold voltage, and the second detection circuit is connected with the detection control circuit.

Optionally, the detection control circuit includes a second reset circuit, and the second reset circuit is configured to generate the interrupt control signal when the power supply voltage is less than a second control threshold voltage after the first reset signal is released.

Optionally, the second reset circuit is further configured to release the interrupt control signal when the supply voltage is greater than a third control threshold voltage, the third control threshold voltage being greater than the second control threshold voltage.

Optionally, the detection control circuit includes an editable voltage detector for generating the interrupt control signal when the supply voltage is less than a second control threshold voltage after the first reset signal is released.

Optionally, the editable voltage detector is configured to generate the second interrupt signal when the supply voltage is greater than a fourth control threshold voltage, wherein the fourth control threshold voltage is greater than the second control threshold voltage.

Optionally, the power supply monitoring circuit further comprises a switch circuit connected with the first reset circuit and the detection control circuit respectively, and the switch circuit is used for controlling whether the power supply and the functional circuit are connected.

Optionally, the first reset circuit is a power-on reset circuit or a power-off reset circuit.

Optionally, the second reset circuit is an under-voltage reset circuit or a power-down reset circuit.

In a second aspect, an embodiment of the present utility model provides a chip, where the chip includes the power supply monitoring circuit described above.

In a third aspect, an embodiment of the present utility model provides an electronic device, where the electronic device includes the chip described above.

The power supply monitoring circuit, the chip and the electronic equipment provided by the embodiment of the utility model are provided with the first reset circuit, the first detection circuit and the detection control circuit, the first reset circuit monitors the starting stage of the functional circuit, the first detection circuit monitors the first reset threshold voltage of the first reset circuit, when the voltage signal used for representing the first reset threshold voltage is abnormal while monitoring the voltage of the power supply, the first detection circuit can respond to and output the first monitoring feedback signal before the first reset signal is released, the effectiveness of power supply monitoring is improved, the improvement of the operation reliability and the safety is facilitated, and the detection control circuit monitors the working stage of the functional circuit after the first reset signal is released, can adopt different threshold voltages from the starting stage, improves the effectiveness of power supply monitoring, and is beneficial to improving the operation reliability and the safety.

These and other aspects of the utility model will be more readily apparent from the following description of the embodiments.

Drawings

Fig. 1 shows an application scenario diagram of a power supply monitoring circuit provided by an embodiment of the present utility model.

Fig. 2 is a schematic diagram of a power supply monitoring circuit according to an embodiment of the present utility model.

Fig. 3 is a schematic diagram of a power supply monitoring circuit according to an embodiment of the present utility model.

Fig. 4 shows a schematic diagram of a power supply monitoring circuit according to an embodiment of the present utility model.

Fig. 5 shows a schematic structural diagram of a power supply monitoring circuit according to an embodiment of the present utility model.

Fig. 6 shows a schematic structural diagram of a chip according to an embodiment of the present utility model.

Fig. 7 shows a schematic structural diagram of an electronic device according to an embodiment of the present utility model.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present utility model and are not to be construed as limiting the present utility model.

In order to enable those skilled in the art to better understand the solution of the present utility model, the following description will make clear and complete descriptions of the technical solution of the present utility model in the embodiments of the present utility model with reference to the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the embodiments of the present utility model, it should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

Moreover, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In describing embodiments of the present utility model, words such as "exemplary" or "such as" are used to mean illustrated, described, or described. Any embodiment or design described as "exemplary" or "such as" in an embodiment of the utility model is not necessarily to be construed as preferred or advantageous over another embodiment or design. The use of words such as "example" or "such as" is intended to present relative concepts in a clear manner.

In addition, the term "plurality" in the embodiments of the present utility model means two or more, and in view of this, the term "plurality" may be understood as "at least two" in the embodiments of the present utility model. "at least one" may be understood as one or more, for example as one, two or more. For example, including at least one means including one, two or more, and not limiting what is included, e.g., including at least one of A, B and C, then A, B, C, A and B, A and C, B and C, or A and B and C, may be included.

It should be noted that, in the embodiment of the present utility model, "and/or" describe the association relationship of the association object, which means that three relationships may exist, for example, a and/or B may be represented: a exists alone, A and B exist together, and B exists alone. The character "/", unless otherwise specified, generally indicates that the associated object is an "or" relationship.

It should be noted that in embodiments of the present utility model, "connected" may be understood as electrically connected, and two electrical components may be connected directly or indirectly between the two electrical components. For example, a may be directly connected to B, or indirectly connected to B via one or more other electrical components.

The first pole/first end of each transistor employed in the embodiments of the present utility model is one of the source and the drain, and the second pole/second end of each transistor is the other of the source and the drain. Since the source and drain of the transistor may be symmetrical in structure, the source and drain may be indistinguishable in structure, that is, the first pole/first terminal and the second pole/second terminal of the transistor in embodiments of the present utility model may be indistinguishable in structure. Illustratively, in the case where the transistor is a P-type transistor, the first pole/first terminal of the transistor is the source and the second pole/second terminal is the drain; illustratively, in the case where the transistor is an N-type transistor, the first pole/first terminal of the transistor is the drain and the second pole/second terminal is the source.

The power supply monitoring circuit 100 provided by the utility model can be applied to the single chip microcomputer 200 shown in fig. 1, the single chip microcomputer 200 comprises two functional circuits 201, each functional circuit 201 is correspondingly provided with one power supply monitoring circuit 100, the power supply monitoring circuit 100 is connected with the corresponding functional circuit 201, and the power supply monitoring circuit 100 is used for monitoring the voltage of the corresponding functional circuit 201.

An embodiment of the present utility model provides a power monitoring circuit 100, referring to fig. 2, the power monitoring circuit 100 is disposed between a power source 101 and a functional circuit 201, and the power monitoring circuit 100 of the present embodiment includes: a first reset circuit 11, a first detection circuit 12, and a detection control circuit 13.

Wherein the first reset circuit 11 is configured to generate or release a first reset signal.

In the present embodiment, the first reset circuit 11 may generate the first reset signal after power-on; and releasing the first reset signal when the supply voltage is greater than the first reset threshold voltage.

In this embodiment, the first reset signal generated by the first reset circuit 11 is an active reset signal, and releasing may refer to the signal being changed from active to inactive, and releasing the first reset signal may refer to the signal being changed from active to inactive.

In this embodiment, the first reset circuit 11 operates in the start-up phase of the functional circuit 201, generates an effective first reset signal after being powered on, and gradually increases the supply voltage of the power supply, and when the supply voltage is greater than the first reset threshold voltage, the functional circuit 201 satisfies the start-up condition, releases the first reset signal, and the functional circuit 201 enters the operation phase.

As an embodiment, the first reset signal may be a high level signal, and the first reset signal is released to be turned into a low level signal that is inactive.

As another embodiment, the first reset signal may be a low level signal, releasing the first reset signal to turn the first reset signal to an inactive high level signal.

The first detection circuit 12 is connected to the first reset circuit 11, and the first detection circuit 12 is configured to detect the first reset threshold voltage, and output a first monitoring feedback signal when the first reset threshold voltage is less than a first operating threshold voltage.

In this embodiment, the first detection circuit 12 operates in the start-up phase of the functional circuit 201, the first reset threshold voltage of the first reset circuit 11 is generated by a voltage signal, the first detection circuit 12 may collect the voltage signal for representing the first reset threshold voltage to obtain the first reset threshold voltage, and then compare the first reset threshold voltage with the voltage signal for representing the first working threshold voltage, and output the first monitoring feedback signal when the first reset threshold voltage is smaller than the first working threshold voltage.

In this embodiment, when the first reset threshold voltage is set unreasonably, or when an abnormality occurs in the operation of the first reset circuit 11, which causes an abnormality in the voltage signal used to characterize the first reset threshold voltage, the first reset threshold voltage is used as a basis for determining whether the power supply voltage is abnormal, and the abnormality itself occurs, the first reset circuit 11 is not capable of performing effective power supply monitoring at this time, and the first detection circuit 12 outputs a first monitoring feedback signal to prompt the invalidation of the first reset threshold voltage. As an embodiment, the first monitoring feedback signal may be an error signal or an alarm signal.

In this embodiment, in the reset state where the first reset circuit 11 generates the first reset signal, when the first detection circuit 12 detects that the first reset threshold voltage is smaller than the first operation threshold voltage, the first monitoring feedback signal is output, at this time, the functional circuit 201 has not yet entered the operation stage, and the system can handle the abnormality of the first reset threshold voltage according to the first monitoring feedback signal.

The detection control circuit 13 is configured to generate an interrupt control signal when the power supply voltage is less than the second control threshold voltage after the first reset signal is released. In the present embodiment, the detection control circuit 13 operates in the operation stage of the functional circuit 201, and generates an interrupt control signal to prevent an abnormality in operation of the functional circuit 201 due to a continued decrease in the supply voltage when the supply voltage is smaller than the second control threshold voltage.

In this embodiment, the second control threshold voltage may be greater than the first reset threshold voltage, or the second control threshold voltage may be less than the first reset threshold voltage, and the first reset threshold voltage and the second control threshold voltage may be selected according to specific needs of the functional circuit 201.

In this embodiment, the functional circuit 201 is a circuit for realizing a certain function in a single chip or a chip, for example, a filter circuit, a counter circuit, or the like.

In the present embodiment, the detection control circuit 13 operates after the first reset signal is released.

As an embodiment, the first reset circuit 11 may send an indication signal that the first reset signal has been released to the core after releasing the first reset signal, and after receiving the indication signal, the core sends a control signal to the detection control circuit 13 to control the detection control circuit 13 to start detecting the power supply voltage, so as to generate the interrupt control signal when the power supply voltage is smaller than the second control threshold voltage. In the present embodiment, the detection control circuit 13 and the first reset circuit 11 may not be connected.

As another embodiment, the detection control circuit 13 may be connected to the first reset circuit 11 to start detecting the supply voltage after the first reset signal is released, so as to generate the interrupt control signal when the supply voltage is less than the second control threshold voltage.

As another embodiment, referring to fig. 3, a first switch circuit 16 is connected between the power supply 101 and the functional circuit 201, the power supply 101 is connected to a first end 161 of the first switch circuit 16, the functional circuit 201 is connected to a second end 162 of the first switch circuit 16, a detection node of the first reset circuit 11 is located between the power supply 101 and the first end 161, a detection node of the detection control circuit 13 is located between the second end 162 and the functional circuit 201, and when the first reset signal is not released, the first switch circuit 16 is turned off, and the detection control circuit 13 cannot detect the supply voltage of the power supply 101; after the first reset signal is released, the first switch circuit 16 is turned on, and the detection control circuit 13 can detect the supply voltage of the power supply 101. In the embodiment, the detection control circuit 13 and the first reset circuit 11 may not be connected.

As an embodiment, after receiving the output interrupt control signal, the core may save the current work execution state data, perform corresponding processing according to the interrupt control signal after a preset delay time, and control the functional circuit 201 to continue to execute from the saved work execution state data after the power supply voltage is restored.

The power supply monitoring circuit of this embodiment has set up first reset circuit, first detection circuit and detection control circuit, first reset circuit monitors the start-up stage of functional circuit, first detection circuit monitors the first reset threshold voltage of first reset circuit, when the voltage signal that is used for representing first reset threshold voltage appears unusual when monitoring the voltage of power, first detection circuit can respond output first control feedback signal before first reset signal releases, the validity of power supply monitoring has been improved, be favorable to the improvement of operational reliability and security, and after first reset signal releases, detection control circuit monitors the operating phase of functional circuit, can adopt the threshold voltage different with the start-up stage, the validity of power supply monitoring has been improved, be favorable to the improvement of operational reliability and security.

As an embodiment, the first reset circuit 11 may be a power-on reset circuit or a power-off reset circuit.

As an implementation manner, referring to fig. 4, the power monitoring circuit 100 of the present embodiment further includes: and a second detection circuit 14 connected to the detection control circuit 13, where the second detection circuit 14 is configured to detect the second control threshold voltage, and output a second monitoring feedback signal when the second control threshold voltage is less than a second operation threshold voltage.

In this embodiment, the second detection circuit 14 operates in the operating phase of the functional circuit 201, the second control threshold voltage of the detection control circuit 13 is generated by a voltage signal, the second detection circuit 14 may collect a voltage signal for representing the second control threshold voltage to obtain the second control threshold voltage, and then compare the second control threshold voltage with the voltage signal representing the second operating threshold voltage, and output the second monitoring feedback signal when the second control threshold voltage is less than the second operating threshold voltage.

In this embodiment, when the second control threshold voltage is set unreasonably, or when an abnormality occurs in the operation of the detection control circuit 13, which causes an abnormality in the voltage signal for characterizing the second control threshold voltage, the second control threshold voltage is used as a basis for determining whether the power supply voltage is abnormal or not, and the detection control circuit 13 itself is abnormal, and at this time, the second detection circuit 14 outputs a second monitoring feedback signal to prompt the invalidation of the second control threshold voltage. As an embodiment, the second monitoring feedback signal may be an error signal or an alarm signal.

In the present embodiment, when the second detection circuit 14 detects that the second control threshold voltage is smaller than the second operation threshold voltage before the detection control circuit 13 outputs the interrupt control signal, the second monitor feedback signal is output, and at this time, the system can handle abnormality of the second control threshold voltage based on the second monitor feedback signal.

As an embodiment, the detection control circuit 13 includes a second reset circuit for generating the interrupt control signal when the power supply voltage is smaller than the second control threshold voltage after the first reset signal is released.

In this embodiment, in the working phase of the functional circuit 201, when the power supply voltage is less than the second control threshold voltage, the second reset circuit generates the interrupt control signal, after receiving the output interrupt control signal, the core may save the current work execution state data, reset according to the interrupt control signal after a preset delay time, and control the functional circuit 201 to start to execute continuously from the saved work execution state data after the power supply voltage is restored.

Further, the second reset circuit is further configured to release the interrupt control signal when the power supply voltage is greater than a third control threshold voltage, where the third control threshold voltage is greater than the second control threshold voltage.

In this embodiment, the difference between the third control threshold voltage and the second control threshold voltage is a reset return voltage, and the return voltage is set to prevent frequent bounce when the power supply voltage is noisy, and the functional circuit 201 starts to continue normal operation after the power supply voltage of the power supply is greater than the third control threshold voltage.

The second Reset circuit may be, for example, a Brown Out Reset (BOR) circuit or a Power Down Reset (PDR) circuit.

As an implementation manner, the detection control circuit 13 of this embodiment includes an editable voltage detector (Programmable Voltage Detector, PVD), where the interrupt control signal is an interrupt signal, and the editable voltage detector is configured to generate the interrupt control signal when the power supply voltage is less than the second control threshold voltage after the first reset signal is released.

In this embodiment, in the working phase of the functional circuit 201, when the power supply voltage is less than the second control threshold voltage, the editable voltage detector generates an interrupt control signal, and after receiving the output interrupt control signal, the core may save the current work execution state data, and after a preset delay time, perform a preset interrupt procedure according to the interrupt control signal, and after the power supply voltage is restored, control the functional circuit 201 to continue to execute from the saved work execution state data.

Further, the editable voltage detector is configured to generate the second interrupt signal when the supply voltage is greater than a fourth control threshold voltage, wherein the fourth control threshold voltage is greater than the second control threshold voltage.

In this embodiment, the difference between the fourth control threshold voltage and the second control threshold voltage is a reset return difference voltage, and the return difference voltage is set to prevent frequent bounce when the power supply voltage is noisy, after the power supply voltage of the power supply is greater than the fourth control threshold voltage, a second interrupt signal is generated, after the kernel receives the output second interrupt signal, the kernel may end executing the interrupt program, and after a preset time, the control function circuit 201 starts to execute from the saved work execution state data, and the function circuit 201 starts to continue normal work.

As an embodiment, referring to fig. 5, the power supply monitoring circuit 100 of the present embodiment further includes a switch circuit 15 connected to the first reset circuit 11 and the detection control circuit 13, respectively, for controlling whether the power supply 101 and the functional circuit 201 are connected. The detection control circuit 13 is a second reset circuit, and the interrupt control signal is a reset signal.

In this embodiment, the switch circuit 15 includes a first connection terminal 151 connected to the power supply 101, a second connection terminal 152 connected to the functional circuit 201, and a control terminal 153, the voltage acquisition terminal of the first reset circuit 11 is connected to the power supply 101 and the first connection terminal 151, the voltage acquisition terminal of the detection control circuit 13 is connected to the functional circuit 201 and the second connection terminal 152, and at the same time, the signal output terminal of the first reset circuit 11 is connected to the control terminal 153, and the signal output terminal of the detection control circuit 13 is connected to the control terminal 153.

In the starting stage of the functional circuit 201, the first reset signal generated by the first reset circuit 11 can be used as the control signal of the switch circuit 15 at the same time, and the first reset circuit 11 sends the first reset signal to the control terminal 153 to control the power supply 101 to be disconnected from the functional circuit 201; the first reset circuit 11 releases the first reset signal, converts the first reset signal into an inactive signal, and the first reset circuit 11 sends the inactive signal to the control terminal 153 to control the connection of the power supply 101 and the functional circuit 201. Illustratively, the first reset signal may be a high level signal; when the first reset signal is released, the first reset signal is turned into a low level signal.

In the working stage of the functional circuit 201, the interrupt control signal generated by the detection control circuit 13 (the second reset circuit) can be used as the control signal of the switch circuit 15, and the detection control circuit 13 (the second reset circuit) sends the interrupt control signal to the control terminal 153 to control the power supply 101 to be disconnected from the functional circuit 201; the detection control circuit 13 is a second reset circuit, the interrupt control signal is a reset signal, the interrupt control signal is released, the interrupt control signal is converted into an invalid signal, and the detection control circuit 13 (second reset circuit) sends the invalid signal to the control terminal 153 to control the connection of the power supply 101 and the functional circuit 201. Illustratively, the interrupt control signal may be a high level signal; when the interrupt control signal is released, the interrupt control signal is turned to a low level signal.

Illustratively, the switching circuit 15 may be a transistor switching module, a first end of which is connected to the power supply 101, and a second end of which is connected to the functional circuit 201, and the transistor switching module is used to control whether the power supply 101 and the functional circuit 201 are connected. The transistor switch module is configured to receive a first reset signal or an interrupt control signal, and control whether the power supply 101 and the functional circuit 201 are connected according to the first reset signal or the interrupt control signal.

In the above embodiments, the transistor switch module may be a metal oxide semiconductor field effect transistor (metal oxide semiconductor field effect transistor, MOSFET), abbreviated as MOS transistor or FET transistor; the transistor switch module may also be a bipolar junction transistor (bipolar junction transistor, BJT), simply a bipolar transistor, BJT transistor or triode.

In the above embodiment, the transistor switch module may include one MOS transistor, or may include two MOS transistors connected in series, and the two MOS transistors are described in detail below as an example, where the switch circuit 15 includes a first MOS transistor and a second MOS transistor, the first end of the transistor switch module is the first end of the first MOS transistor, the second end of the transistor switch module is the second end of the second MOS transistor, the second end of the first MOS transistor is connected to the first end of the second MOS transistor, and the control end of the first MOS transistor and the control end of the second MOS transistor are respectively used for receiving the first reset signal or the interrupt control signal of the first reset circuit 11 or the second reset circuit 13. When the first reset signal is released or when the interrupt control signal is released, the first MOS transistor and the second MOS transistor are both in an on state, and the power supply 101 and the functional circuit 201 are connected; when the first reset signal is received or when the interrupt control signal is received, the first MOS transistor and the second MOS transistor are both in an off state, and the connection between the power supply 101 and the functional circuit 201 is disconnected.

The first MOS transistor and the second MOS transistor may be P-type MOS transistors or N-type MOS transistors, the first end of the first MOS transistor and the first end of the second MOS transistor may be a source or a drain, respectively, the second end of the first MOS transistor and the second end of the second MOS transistor may be a drain or a source, respectively, and the control end of the first MOS transistor and the control end of the second MOS transistor may be gates, respectively.

It should be understood by those skilled in the art that, although the embodiment specifically illustrates the transistor switch module by taking the MOS transistor as an example, the scheme of the transistor switch module in this embodiment may also be applied to the BJT transistor, where the PNP type BJT transistor may correspond to the P type MOS transistor, the NPN type BJT transistor may correspond to the N type MOS transistor, the base of the BJT transistor may correspond to the gate of the MOS transistor, the emitter of the BJT transistor may correspond to the source of the MOS transistor, and the collector of the BJT transistor may correspond to the drain of the MOS transistor.

An embodiment of the present utility model provides a chip 300, where the chip 300 may include at least one functional circuit 201, and referring to fig. 6, the chip 300 includes the power monitoring circuit 100 described above. The Chip (Integrated Circuit, IC) is also referred to as a Chip, which may be, but is not limited to, a SOC (System on Chip) Chip, SIP (System in package ) Chip.

The chip of this embodiment has set up first reset circuit, first detection circuit and detection control circuit, first reset circuit monitors the start-up stage of functional circuit, first detection circuit monitors the first reset threshold voltage of first reset circuit, when monitoring the voltage of power, when the voltage signal that is used for representing first reset threshold voltage appears unusual, first detection circuit can respond to and output first control feedback signal before first reset signal releases, the validity of power control has been improved, be favorable to the improvement of operational reliability and security, and after first reset signal releases, detection control circuit monitors the operating phase of functional circuit, can adopt the threshold voltage different with the start-up stage, the validity of power control has been improved, be favorable to the improvement of operational reliability and security.

An embodiment of the present utility model further provides an electronic device 400, referring to fig. 7, where the electronic device 400 includes a device body and the chip 300 disposed in the device body. The electronic device may be, but is not limited to, a weight scale, a body fat scale, a nutritional scale, a pulse oximeter, a body composition analyzer, a display, a USB (Universal Serial Bus ) docking station, an automobile, a smart wearable device, a mobile terminal, a smart home device. The intelligent wearing equipment comprises, but is not limited to, an intelligent watch, an intelligent bracelet and a cervical vertebra massage instrument. Mobile terminals include, but are not limited to, smartphones, notebook computers, tablet computers, POS (point of sales terminal, point of sale terminal) machines. The intelligent household equipment comprises, but is not limited to, an intelligent socket, an intelligent electric cooker, an intelligent sweeper and an intelligent lamp.

The electronic equipment of this embodiment has set up first reset circuit, first detection circuit and detection control circuit, first reset circuit monitors the start-up stage of functional circuit, first detection circuit monitors the first reset threshold voltage of first reset circuit, when monitoring the voltage of power, when the voltage signal that is used for representing first reset threshold voltage appears unusual, first detection circuit can respond output first control feedback signal before first reset signal releases, the validity of power control has been improved, be favorable to the improvement of operational reliability and security, and after first reset signal releases, detection control circuit monitors the operating phase of functional circuit, can adopt the threshold voltage different with the start-up stage, the validity of power control has been improved, be favorable to the improvement of operational reliability and security.

While the utility model has been described with respect to the above embodiments, it should be noted that modifications can be made by those skilled in the art without departing from the inventive concept, and these are all within the scope of the utility model.

Claims

1. A power supply monitoring circuit, the power supply monitoring circuit comprising:

2. The power supply monitoring circuit of claim 1, further comprising a second detection circuit that outputs a second monitoring feedback signal when the second control threshold voltage is less than a second operating threshold voltage, the second detection circuit being coupled to the detection control circuit.

3. The power supply monitoring circuit of claim 1, wherein the detection control circuit includes a second reset circuit for generating the interrupt control signal when the supply voltage is less than a second control threshold voltage after the first reset signal is released.

4. The power supply monitoring circuit of claim 3, wherein the second reset circuit is further configured to release the interrupt control signal when the supply voltage is greater than a third control threshold voltage, the third control threshold voltage being greater than the second control threshold voltage.

5. The power supply monitoring circuit of claim 1, wherein the detection control circuit includes an editable voltage detector for generating the interrupt control signal when the supply voltage is less than a second control threshold voltage after the first reset signal is released.

6. The power supply monitoring circuit of claim 5, wherein the editable voltage detector is configured to generate a second interrupt signal when a supply voltage is greater than a fourth control threshold voltage, wherein the fourth control threshold voltage is greater than the second control threshold voltage.

7. The power supply monitoring circuit according to claim 1, further comprising a switching circuit connected to the first reset circuit and the detection control circuit, respectively, for controlling whether a power supply and a functional circuit are connected.

8. The power supply monitoring circuit of claim 1, wherein the first reset circuit is a power-on reset circuit or a power-off reset circuit.

9. A power supply monitoring circuit according to claim 3, wherein the second reset circuit is an under-voltage reset circuit or a power-down reset circuit.

10. A chip comprising a power supply monitoring circuit according to any one of claims 1 to 9.

11. An electronic device comprising the chip of claim 10.