A latch circuit and sensor device

Abstract

The application provides a latch circuit and a sensor device, wherein the latch circuit at least comprises a comparator, a first input end of the comparator is electrically connected with an external sensor module, a second input end of the comparator is electrically connected with an external controller, and an output end of the comparator is electrically connected with the second input end, wherein the comparator receives a sensing signal output by the external sensor module, a control signal output by the external controller and / or a feedback signal of the output end, and outputs a latch level signal. The latch circuit and the sensor device based on the application realize latching of the sensing signal of the sensor module, and reduce the power consumption of the sensor device.

Description

Technical Field

[0001] The present invention belongs to the field of electronic technology, and in particular relates to a latch circuit and a sensor device based on the latch circuit. Background Art

[0002] At present, battery-powered radar sensors generally consist of a controller, a radar sensor module, and a battery power module, such as Figure 1 As shown, the radar sensor module is used to monitor the activities of human objects in the target environment, and the controller is used to send the sensing signal of the radar sensor module to other main control devices, such as gateways, routers, etc. The power supply used by the battery-powered module is generally dry batteries, lithium batteries, etc.

[0003] In actual application scenarios, the standby time of these radar sensors is generally required to be relatively long, such as one or two years, to avoid the poor user experience caused by frequent battery removal and replacement. However, the operation of the radar sensor controller and radar sensor module inevitably consumes a lot of power, which greatly shortens the standby time. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, the present application proposes a latch circuit and a sensor device based on the latch circuit. The latch circuit is used to latch the sensing signal of the sensor module, thereby latching the sensing signal of the sensor module based on low-power signal latching technology, reducing the power consumption of the sensor device and extending the working time.

[0005] In one aspect, an embodiment of the present application discloses a latch circuit, comprising at least:

[0006] a comparator, wherein a first input terminal of the comparator is electrically connected to an external sensor module, a second input terminal of the comparator is electrically connected to an external controller, and an output terminal of the comparator is electrically connected to the second input terminal.

[0007] The comparator receives the sensing signal output by the external sensor module, the control signal output by the external controller and / or the feedback signal of the output terminal, and outputs a latched level signal.

[0008] In some embodiments, the latch circuit further comprises:

[0009] a first buffer resistor electrically connected between the external sensor and the first input terminal;

[0010] a second buffer resistor electrically connected between the external controller and the second input terminal;

[0011] A feedback resistor is electrically connected between the output terminal and the second input terminal.

[0012] In some embodiments, the latch circuit further includes: a switch circuit electrically connected between the second buffer resistor and the second input terminal.

[0013] In some embodiments, the switching circuit includes at least:

[0014] a switching tube, wherein the gate of the switching tube is connected to the output end of the second buffer resistor, the drain of the switching tube is connected to the second input end, and the source of the switching tube is connected to the ground level; optionally, the switching tube is an enhanced N-type field effect tube;

[0015] A pull-down resistor is connected in parallel between the gate and the source of the switch tube.

[0016] In some embodiments, the latch circuit further comprises:

[0017] a first filter circuit connected in parallel between the first buffer resistor and the first input terminal;

[0018] The second filter circuit is connected in parallel between the drain of the switch tube and the second input terminal.

[0019] In some embodiments, the first filtering circuit and the second filtering circuit are RC filtering circuits.

[0020] In some embodiments, the first filtering circuit includes at least:

[0021] a first filter resistor, one end of which is connected to the output end of the first buffer resistor and the other end of which is connected to the ground level;

[0022] The first filter capacitor is connected in parallel to the first filter resistor.

[0023] In some embodiments, the second filtering circuit includes at least:

[0024] a second filter resistor, one end of which is connected to the second input terminal, and the other end of which is connected to the ground level;

[0025] The second filter capacitor is connected in parallel to the second filter resistor.

[0026] In some embodiments, the comparator is an OR gate comparator.

[0027] Based on the latch circuit described above, when the sensing signal from the external sensor module is a high-level pulse signal, this signal is input to the first input of the comparator. Based on OR gate logic, the comparator's latch-level signal becomes a high-level pulse signal, and through the feedback resistor, the comparator's second input becomes a high-level signal, causing the comparator to enter a self-locking state, causing the comparator to maintain its output of a high-level latch-level signal, thereby latching the signal. When the control signal is a high-level pulse signal, this signal turns on the switch circuit. After this, a low-level signal is input to the second input of the comparator, releasing the self-locking state. At this point, the output of the latch circuit is adjusted accordingly based on the sensing signal.

[0028] In a second aspect, an embodiment of the present application further discloses a sensor device, comprising at least:

[0029] The sensor module is electrically connected to a latch circuit;

[0030] A controller, electrically connected to the latch circuit and communicatively connected to other main control devices;

[0031] The battery power supply module is electrically connected to the sensor module, the latch circuit and the controller.

[0032] In some embodiments, the latch circuit includes at least:

[0033] a comparator, wherein a first input terminal of the comparator is electrically connected to the sensor module, a second input terminal of the comparator is electrically connected to the controller, and an output terminal of the comparator is electrically connected to the second input terminal.

[0034] The comparator receives the sensing signal output by the external sensor module, the control signal output by the controller and / or the feedback signal from the output terminal, and outputs a latched level signal.

[0035] In some embodiments, the latch circuit further comprises:

[0036] a first buffer resistor electrically connected between the sensor module and the first input terminal;

[0037] a second buffer resistor electrically connected between the controller and the second input terminal;

[0038] A feedback resistor is electrically connected between the output terminal and the second input terminal.

[0039] In some embodiments, the latch circuit further includes: a switch circuit electrically connected between the second buffer resistor and the second input terminal.

[0040] In some embodiments, the controller is configured to automatically wake up at intervals of a deep sleep cycle with time T being the interval.

[0041] In some embodiments, the switching circuit includes at least:

[0042] a switching tube, wherein the gate of the switching tube is connected to the output end of the second buffer resistor, the drain of the switching tube is connected to the second input end, and the source of the switching tube is connected to the ground level; optionally, the switching tube is an enhanced N-type field effect tube;

[0043] A pull-down resistor is connected in parallel between the gate and the source of the switch tube.

[0044] In some embodiments, the latch circuit further comprises:

[0045] a first filter circuit connected in parallel between the first buffer resistor and the first input terminal;

[0046] The second filter circuit is connected in parallel between the drain of the switch tube and the second input terminal.

[0047] In some embodiments, the first filtering circuit and the second filtering circuit are RC filtering circuits.

[0048] In some embodiments, the first filtering circuit includes at least:

[0049] a first filter resistor, one end of which is connected to the output end of the first buffer resistor and the other end of which is connected to the ground level;

[0050] The first filter capacitor is connected in parallel to the first filter resistor.

[0051] In some embodiments, the second filtering circuit includes at least:

[0052] a second filter resistor, one end of which is connected to the second input terminal, and the other end of which is connected to the ground level;

[0053] The second filter capacitor is connected in parallel to the second filter resistor.

[0054] In some embodiments, the sensor module is, but is not limited to, a radar sensor module.

[0055] In a second aspect, an embodiment of the present application further discloses a sensor system, including the sensor device as described in the second aspect above, and the sensor system further includes one of a controlled device, a gateway and a server or any combination thereof.

[0056] In some embodiments, the controlled device is a light source device, and the light source device is configured to be turned on or off according to a monitoring result of the sensor device.

[0057] Compared with the prior art, the advantages and positive effects of the present invention are:

[0058] The latch circuit proposed in the present invention can be used to latch the sensing signal, and the latch circuit is applied to the sensor device. The sensor device based on the present invention can use the latch circuit to enable the controller to operate in a low-power deep sleep state for a long time, thereby reducing the power consumption of the sensor device, thereby extending the battery life of the device and further extending the working time of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0060] Figure 1 Schematic diagram of the structure of a radar sensor according to the prior art;

[0061] Figure 2 is a circuit schematic diagram of a latch circuit according to an embodiment of the present application;

[0062] Figure 3 is a schematic structural diagram of a sensor device according to an embodiment of the present application;

[0063] Figure 4 Based on Figure 1 The timing diagram of the working principle of the radar sensor in the prior art is shown;

[0064] Figure 5 1 is a timing diagram of the working principle of the sensor device according to an embodiment of the present application.

[0065] in:

[0066] 1. Radar sensor; 101. Radar sensor module; 102. Controller;

[0067] 103. Battery power module;

[0068] 11. Switching circuit; 12. First filtering circuit; 13. Second filtering circuit;

[0069] 2. Sensor device; 201. Sensor module; 202. Controller;

[0070] 203. Battery power supply module; 204. Latch circuit. DETAILED DESCRIPTION

[0071] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is described and illustrated below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely used to explain this application and are not intended to limit this application. Based on the embodiments provided in this application, all other embodiments obtained by those of ordinary skill in the art without making any creative efforts are within the scope of protection of this application.

[0072] Obviously, the drawings described below are merely examples or embodiments of the present application. Those skilled in the art can, without inventive effort, apply the present application to other similar scenarios based on these drawings. Furthermore, it is also understood that, although the effort involved in such a development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, changes in design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as an insufficiency of the content disclosed in this application.

[0073] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments unless there is a conflict.

[0074] The exemplary embodiments of the present invention and their description are used to explain the present invention, but are not intended to limit the present invention. In addition, elements / components with the same or similar reference numerals used in the drawings and embodiments are used to represent the same or similar parts.

[0075] Unless otherwise defined, the technical or scientific terms used in this application should have the ordinary meaning understood by a person of ordinary skill in the technical field to which this application belongs. The words "one", "a", "the" and the like used in this application do not indicate a limit on quantity and may indicate the singular or plural. The terms "include", "comprise", "have" and any variations thereof used in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units that are inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like used in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "electrical connection" used in this application may be a direct electrical connection or an indirect electrical connection. The "multiple" used in this application refers to two or more; the "multiple groups" used in this article include "two groups" and "more than two groups". "And / or" describes the relationship between related objects, indicating that three possible relationships exist. For example, "6 and / or 7" can mean: 6 exists alone, 6 and 7 exist at the same time, and 7 exists alone. The character " / " generally indicates that the related objects are in an "or" relationship. The terms "first," "second," "third," etc. used in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0076] Figure 4 Based on Figure 1 The working principle timing diagram of the radar sensor of the prior art is shown in FIG. Figure 1 and Figure 4 As shown, the existing radar sensor 1 is composed of a controller 102, a radar sensor module 101, and a battery power module 103. When the radar sensor 1 based on the above structure monitors a person in an actual application scenario, the working logic is as follows:

[0077] (1) When no one enters the monitoring area: the radar sensor module 101 of the radar sensor 1 is continuously in working state and monitors whether there is a person or object entering the monitoring area, and its sensing signal is a low-level signal; based on this, the controller 102 is in a deep sleep state, that is, a low-power standby state, and waits for the radar sensor module 101 to wake up the sensing signal;

[0078] (2) When someone enters the monitoring area: When the radar sensor module 101 detects the movement of a person object entering the monitoring area, the sensing signal is a high-level pulse signal, and the controller 102 is awakened to send a reporting message; further, when the radar sensor module 101 frequently detects the movement of a person object in the monitoring area, the controller 102 will be awakened frequently; therefore, the radar sensor module 101 and the controller 102 will be frequently in working state.

[0079] Based on the operating logic of the aforementioned radar sensor, the present embodiment reduces power consumption by enabling the controller 102 to be awakened at regular intervals to respond to the radar module. Furthermore, considering that only configuring the controller 102 to operate at intervals would result in loss of sensing signals, making it impossible to accurately record whether a person or object has entered the monitoring area, the present embodiment provides a latch circuit and a sensor device based on the latch circuit.

[0080] Figure 2 is a circuit diagram of a latch circuit according to an embodiment of the present application, refer to Figure 2 As shown, the latch circuit of the embodiment of the present application at least includes:

[0081] Comparator U5, the first input end of the comparator U5 is electrically connected to the external sensor module via the first buffer resistor R52, the second input end of the comparator U5 is electrically connected to the external controller via the second buffer resistor R51, the comparator U5 receives the sensing signal DEOUT output by the external sensor module and the control signal Rest Gate output by the external controller, and outputs a latched level signal Radar Out. Optionally, the comparator U5 adopts an OR gate comparator. Figure 2 As shown, A and B of the comparator U5 are the first input terminal and the second input terminal respectively, and Y is the output terminal. As long as either A or B is high, the Y output is high; only when A and B are low at the same time, the Y output is low.

[0082] The feedback resistor R46 is electrically connected between the output terminal and the second input terminal of the comparator U5, so that the second input terminal of the comparator U5 receives the feedback signal from the output terminal. Based on the feedback resistor R46, the output terminal of the comparator U5 can be prevented from being directly grounded, thereby avoiding increased power consumption.

[0083] The switch circuit 11 is electrically connected between the second buffer resistor R51 and the second input terminal. Specifically, the switch circuit 11 includes at least: a switch transistor Q2, the gate of which is connected to the output terminal of the second buffer resistor R51, the drain of which is connected to the second input terminal, and the source of which is connected to the ground level; and a pull-down resistor R50, which is connected in parallel between the gate and source of the switch transistor Q2. Optionally, the switch transistor Q2 is an enhanced N-type field-effect transistor. Based on this switch circuit, the second input terminal of the comparator U5 is a low-level signal. It is worth noting that the switch circuit 11 of the embodiment of the present application can also be omitted, and the second input terminal can be directly connected to an external controller. As an alternative to the switch circuit 11, the external controller outputs a high-impedance control signal Rest Gate.

[0084] The first filter circuit 12 is connected in parallel between the first buffer resistor R52 and the first input terminal; the second filter circuit 13 is connected in parallel between the drain of the switch tube Q2 and the second input terminal. Optionally, the first filter circuit 12 and the second filter circuit 13 are RC filter circuits. Specifically, the first filter circuit 12 at least includes: a first filter resistor R49, one end of which is connected to the output terminal of the first buffer resistor R52 and the other end is connected to the ground level; a first filter capacitor C14, which is connected in parallel to the first filter resistor R49. The second filter circuit 13 at least includes: a second filter resistor R48, one end of which is connected to the second input terminal and the other end is connected to the ground level; a second filter capacitor C15, which is connected in parallel to the second filter resistor R48. The above-mentioned first filter circuit 12 and second filter circuit 13 provide a discharge path for the charge generated by electrostatic discharge inside the circuit, thereby improving the circuit's anti-interference ability.

[0085] Based on the above latch circuit, when the sensing signal DEOUT of the external sensor module is a high-level pulse signal, the signal is input to the first input terminal of the comparator U5. According to the OR gate logic, the latch level signal Radar Out of the comparator U5 is a high-level pulse signal and the second input terminal of the comparator U5 is a high-level signal through the feedback resistor R46, entering a self-locking state, so that the comparator U5 continues to output the high-level latch level signal Radar Out, thereby realizing the latch signal; when the control signal Rest Gate is a high-level pulse signal, the signal turns on the switch circuit. After turning on, a low-level signal is input to the second input terminal of the comparator U5, and the above-mentioned self-locking state is released. At this time, the output of the latch circuit is adjusted accordingly according to the sensing signal DEOUT. Specifically, if the sensing signal DEOUT is a high-level pulse signal, the latch enters the self-locking state again. If the sensing signal DEOUT is a low-level pulse signal, the latch outputs the low-level latch level signal Radar Out.

[0086] In addition, based on the latch circuit as described in the above embodiment, the application further discloses a sensor device. Figure 3 For the structural schematic diagram of the sensor device according to the embodiment of the application, in combination with the reference Figure 2 , 3 The sensor device 2 at least includes the following modules:

[0087] The sensor module 201 is electrically connected to the latch circuit 204, and optionally, the sensor module 201 adopts but is not limited to a radar sensor module, and can also be an infrared sensor module or other sensing modules that can be used to monitor objects and object movements in a target scene.

[0088] The controller 202 is electrically connected to the latch circuit 204 and is communicatively connected to other host devices such as a gateway, a router, etc., and optionally, the controller 202 at least includes a transmitting antenna, a receiving antenna, a filter circuit and / or an analog-to-digital (AD) conversion circuit, wherein the controller 202 is configured to automatically wake up at a deep sleep cycle interval of time T.

[0089] The battery power supply module 203 is electrically connected to the sensor module 201, the latch circuit 204 and the controller 202.

[0090] The latch circuit 204 at least includes:

[0091] The comparator U5 has a first input end electrically connected to the sensor module 201 through a first buffer resistor R52, and a second input end electrically connected to the controller 202 through a second buffer resistor R51, and receives an induction signal DEOUT output by the sensor module 201 and a control signal Rest Gate output by the controller 202, and outputs a latch level signal Radar Out, and optionally, the comparator U5 adopts an OR gate comparator. The controller 202 is configured to output the control signal Rest Gate as a high-level pulse after reading the latch level signal Radar Out, so as to control the latch circuit 204 to release the self-locking state.

[0092] The feedback resistor R46 is electrically connected between the output end and the second input end of the comparator U5, so that the second input end of the comparator U5 receives a feedback signal from the output end, and based on the feedback resistor R46, the output end of the comparator U5 can be prevented from being directly grounded, thereby avoiding an increase in power consumption.

[0093] The switch circuit 11 is electrically connected between the second buffer resistor R51 and the second input terminal. Specifically, the switch circuit 11 includes at least: a switch tube Q2, the gate of the switch tube Q2 is connected to the output terminal of the second buffer resistor R51, the drain of the switch tube Q2 is connected to the second input terminal, and the source of the switch tube Q2 is connected to the ground level; and a pull-down resistor R50, the pull-down resistor R50 is connected in parallel between the gate and source of the switch tube Q2. Optionally, the switch tube Q2 adopts an enhanced N-type field-effect transistor. Based on this switch circuit, the second input terminal of the comparator U5 is a low-level signal. It is worth noting that the switch circuit 11 of the embodiment of the present application can also be omitted, and the second input terminal can be directly connected to an external controller. As an alternative to the switch circuit 11, the external controller outputs a high-impedance control signal Rest Gate.

[0094] The first filter circuit 12 is connected in parallel between the first buffer resistor R52 and the first input terminal; the second filter circuit 13 is connected in parallel between the drain of the switch tube Q2 and the second input terminal. Optionally, the first filter circuit 12 and the second filter circuit 13 are RC filter circuits. Specifically, the first filter circuit 12 at least includes: a first filter resistor R49, one end of which is connected to the output terminal of the first buffer resistor R52 and the other end is connected to the ground level; a first filter capacitor C14, which is connected in parallel to the first filter resistor R49. The second filter circuit 13 at least includes: a second filter resistor R48, one end of which is connected to the second input terminal and the other end is connected to the ground level; a second filter capacitor C15, which is connected in parallel to the second filter resistor R48. The above-mentioned first filter circuit 12 and second filter circuit 13 provide a discharge path for the charge generated by electrostatic discharge inside the circuit, thereby improving the circuit's anti-interference ability.

[0095] Based on the sensor device described above, Figure 5 The working principle timing diagram of the sensor device according to the embodiment of the present application is shown in FIG. Figure 5As shown, when the sensor of the embodiment of the present application is in operation, the controller 202 periodically switches between a deep sleep state and an awake state according to a deep sleep cycle T, and reads the latched level signal Radar Out. Based on this, if a person enters the monitoring area during the controller 202's deep sleep cycle T, the sensor module 201's sensing signal DEOUT becomes a high-level pulse signal, and the latch circuit 204 enters a self-locking state, outputting the latched level signal Radar Out as a high-level signal and maintaining this high-level signal. When the controller 202 wakes up, it reads the latched level signal Radar Out, sends a reporting signal to other master control devices, and issues a high-level pulse control signal Reset Gate to release the latch circuit 204 from the self-locking state. In this way, frequent awakening of the controller 202 is avoided, and sensor signals within the deep sleep cycle T are not lost. The latch circuit 204 enables the controller 202 to operate in a low-power deep sleep state for a longer period of time, ensuring the accuracy of monitoring human and object activities in the target application scenario, while also reducing the power consumption of the sensor device, thereby extending the battery life of the device and thus extending the device's operating time. The sensor device is not limited to monitoring human subjects, but can also be used to monitor the activities of living animals and smart mobile devices such as drones and smart robots.

[0096] In addition, based on the sensor device described in the above embodiment, this embodiment also proposes a sensor system, which includes the sensor device described in the above embodiment, a controlled device, a gateway, and a server, or any combination thereof. The controlled device can be a light source device that is turned on or off based on the monitoring results of the sensor device. It is worth noting that the controlled device can also be a curtain, a door, an electrical device, etc., so that the controlled device can be controlled by a gateway or server based on the monitoring results of the sensor device.

[0097] The above description is merely a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any person skilled in the art may utilize the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes for application in other fields. However, any simple modification, equivalent change, and modification of the above embodiments made in accordance with the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A latch circuit, characterized in that: At least: a comparator, wherein a first input terminal of the comparator is electrically connected to an external sensor module, a second input terminal of the comparator is electrically connected to an external controller, and an output terminal of the comparator is electrically connected to the second input terminal. The second input terminal is directly connected to the external controller, and the external controller outputs a high-impedance control signal; or the second input terminal is electrically connected to the external controller via a switch circuit; The comparator receives the sensing signal output by the external sensor module, the control signal output by the external controller and / or the feedback signal of the output terminal, and outputs a latched level signal.

2. The latch circuit according to claim 1, wherein: Further including: a first buffer resistor electrically connected between the external sensor and the first input terminal; a second buffer resistor electrically connected between the external controller and the second input terminal; A feedback resistor is electrically connected between the output terminal and the second input terminal.

3. The latch circuit according to claim 2, wherein: The switch circuit is electrically connected between the second buffer resistor and the second input terminal.

4. The latch circuit according to claim 3, wherein: The switching circuit at least includes: a switching tube, wherein a gate of the switching tube is connected to the output end of the second buffer resistor, and a drain of the switching tube is connected to the second input end; A pull-down resistor is connected in parallel between the gate and the source of the switch tube.

5. The latch circuit according to claim 4, wherein: Also includes: a first filter circuit connected in parallel between the first buffer resistor and the first input terminal; The second filter circuit is connected in parallel between the drain of the switch tube and the second input terminal.

6. The latch circuit according to any one of claims 1 to 5, characterized in that: The comparator is an OR gate comparator.

7. A sensor device, characterized in that: At least: The sensor module is electrically connected to a latch circuit; A controller, electrically connected to the latch circuit and communicatively connected to other main control devices; A battery power supply module is electrically connected to the sensor module, the latch circuit, and the controller, wherein the latch circuit at least includes: a comparator, wherein a first input terminal of the comparator is electrically connected to the sensor module, a second input terminal of the comparator is electrically connected to the controller, and an output terminal of the comparator is electrically connected to the second input terminal. The second input terminal is directly connected to the controller, and the controller outputs a high-impedance control signal; or the second input terminal is electrically connected to the controller via a switch circuit; The comparator receives the sensing signal output by the sensor module, the control signal output by the controller and / or the feedback signal from the output end, and outputs a latched level signal.

8. The sensor device according to claim 7, characterized in that The latch circuit further comprises: a first buffer resistor electrically connected between the sensor module and the first input terminal; a second buffer resistor electrically connected between the controller and the second input terminal; A feedback resistor is electrically connected between the output terminal and the second input terminal.

9. The sensor device according to claim 8, characterized in that The switch circuit is electrically connected between the second buffer resistor and the second input terminal.

10. The sensor device according to claim 8, characterized in that The controller is configured to automatically wake up with a time T as a deep sleep cycle interval.

11. The sensor device according to claim 9, characterized in that The switching circuit at least includes: a switching tube, wherein a gate of the switching tube is connected to the output end of the second buffer resistor, and a drain of the switching tube is connected to the second input end; A pull-down resistor is connected in parallel between the gate and the source of the switch tube.

12. The sensor device according to claim 11, characterized in that The latch circuit further includes: a first filter circuit connected in parallel between the first buffer resistor and the first input terminal; The second filter circuit is connected in parallel between the drain of the switch tube and the second input terminal.

13. The sensor device according to any one of claims 7 to 12, characterized in that The comparator is an OR gate comparator.

14. The sensor device according to any one of claims 7 to 12, characterized in that The sensor module is, but not limited to, a radar sensor module.

15. A sensor system, characterized in that: The sensor device according to any one of claims 7 to 14 further comprises one of a controlled device, a gateway and a server or any combination thereof.

16. The sensor system according to claim 15, characterized in that The controlled device is a light source device, and the light source device is used to be turned on or off according to the monitoring result of the sensor device.

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