CN212541260U

CN212541260U - Reset circuit of electronic equipment and electronic equipment

Info

Publication number: CN212541260U
Application number: CN202021358578.1U
Authority: CN
Inventors: 李健; 王玉好; 梁志婷; 沈忱; 徐浩
Original assignee: Shanghai Minglue Artificial Intelligence Group Co Ltd
Current assignee: Shanghai Minglue Artificial Intelligence Group Co Ltd
Priority date: 2020-07-10
Filing date: 2020-07-10
Publication date: 2021-02-12
Anticipated expiration: 2030-07-10

Abstract

The utility model provides an electronic equipment's reset circuit and electronic equipment relates to electronic circuit technical field. The reset circuit may include: the charging interface, the protection circuit and the main chip are connected; the power pin of the charging interface is connected with a Power Management Unit (PMU) of the electronic equipment, the PMU is connected with a rechargeable battery of the electronic equipment, and the PMU is connected with the power pin of the main chip; the OTG pin of the charging interface is connected with the node of the protection circuit, and the node of the protection circuit is connected with the reset pin of the main chip, so that the OTG pin is triggered to output a reset signal to the reset pin after the OTG data wire externally connected with the charging interface is pulled out. Use the embodiment of the utility model provides an above-mentioned electronic equipment's reset circuit can save the space on this electronic equipment PCB, makes this electronic equipment realize the miniaturization easily to make the user conveniently reset the operation.

Description

Reset circuit of electronic equipment and electronic equipment

Technical Field

The utility model relates to an electronic circuit technical field particularly, relates to an electronic equipment's reset circuit and electronic equipment.

Background

With the progress of society, people use electronic equipment more and more frequently, but the electronic equipment generally has the risk of dead halt.

At present, when electronic equipment is in a crash situation, a user needs to trigger a reset point of the electronic equipment by a fine needle passing through a pinhole type key to realize a reset function.

Since electronic devices are being miniaturized, such as wearable electronic devices (smart cards, recording pens, etc.), the pinhole-type key needs to occupy space on a Printed Circuit Board (PCB) of the electronic device, which makes miniaturization of the electronic device difficult, and also makes it inconvenient for a user to perform a reset operation.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an electronic equipment's reset circuit and electronic equipment to not enough among the above-mentioned prior art, can save the space on the electronic equipment PCB, make electronic equipment realize the miniaturization easily to make the user conveniently reset the operation.

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:

in a first aspect, an embodiment of the present invention provides a reset circuit of an electronic device, the reset circuit includes: the charging interface, the protection circuit and the main chip are connected; the power pin of the charging interface is connected with a Power Management Unit (PMU) of the electronic equipment, the PMU is connected with a rechargeable battery of the electronic equipment, and the PMU is connected with the power pin of the main chip;

the OTG pin of the charging interface is connected with the node of the protection circuit, and the node of the protection circuit is connected with the reset pin of the main chip, so that the OTG pin is triggered to output a reset signal to the reset pin after the OTG data wire externally connected with the charging interface is pulled out.

Optionally, the OTG pin of the charging interface is connected to the node of the protection circuit, and the node of the protection circuit is further connected to a reset pin of the PMU.

Optionally, the reset circuit further comprises: an antistatic unit; one end of the anti-static unit is connected with the OTG pin, and the other end of the anti-static unit is grounded.

Optionally, the protection circuit further comprises: a voltage dividing resistor and a capacitor; one end of the protection circuit is connected with a preset direct-current power supply, the other end of the divider resistor is grounded through the capacitor, and the other end of the divider resistor is a node of the protection circuit.

Optionally, the preset dc power source is connected to the PMU.

Optionally, the charging interface is a USB interface with an ID pin, and the ID pin is the OTG pin.

In a second aspect, an embodiment of the present invention provides an electronic device, including the reset circuit, the power management unit PMU, and the rechargeable battery described in any one of the first aspects;

optionally, the electronic device is a wearable electronic device.

Optionally, the wearable electronic device is a chest card recording device.

The utility model has the advantages that:

the embodiment of the utility model provides a pair of electronic equipment's reset circuit and electronic equipment, this reset circuit can include: the charging interface, the protection circuit and the main chip are connected; the power pin of the charging interface is connected with a Power Management Unit (PMU) of the electronic equipment, the PMU is connected with a rechargeable battery of the electronic equipment, and the PMU is connected with the power pin of the main chip; the OTG pin of the charging interface is connected with the node of the protection circuit, and the node of the protection circuit is connected with the reset pin of the main chip, so that the OTG pin is triggered to output a reset signal to the reset pin after the OTG data wire externally connected with the charging interface is pulled out. Adopt the embodiment of the utility model provides an above-mentioned electronic equipment's reset circuit is connected to protection circuit's node through the OTG pin that will charge the interface on, then is connected to main chip's reset pin through this node again. Because the ID pin at one end of the OTG data line corresponding to the charging interface is grounded, the OTG data line can be externally connected to the charging interface, and then the level at the reset pin of the main chip is changed (the low level is changed into the high level) when the OTG data line is pulled out, so that the main chip is reset. Therefore, the electronic equipment can be reset without specially arranging a reset key (such as a pinhole key) on the electronic equipment PCB, the space on the electronic equipment PCB can be saved, the electronic equipment is easy to realize miniaturization, and a user can conveniently reset.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a reset circuit of an electronic device according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a reset circuit of another electronic device according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a reset circuit of another electronic device according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a reset circuit of another electronic device according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a specific reset circuit of an electronic device according to an embodiment of the present invention.

Icon: 101-a charging interface; 102-a protection circuit; 103-a main chip; 104-PMU; 105-a rechargeable battery; 106-OTG data line; 301-an antistatic unit; 302-voltage dividing resistance; 303-capacitance; 304-a direct current power supply, 501-a voltage dependent resistor; 502-pull-up resistor.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Before explaining the following embodiments of the present invention, some terms used in the present invention will be explained first to facilitate understanding by those skilled in the art.

USB (Universal Serial Bus) data line: the device can be used for connecting and communicating a computer with external equipment (such as a mobile phone), and also can be used for charging equipment (such as a mobile phone) and connecting with other equipment. In colloquial, the USB data line is used for data transmission and charging. One end of the USB data line is a standard USB interface (e.g., an a/B USB interface), and the other end of the USB data line may be different according to different types of charging interfaces of the electronic device, such as a Min USB (mini USB) interface of a B Type, a Micro USB (Micro USB) interface of a B Type, a Lightning interface, and a Type-C interface. No matter the Min USB interface of the B Type or the Micro USB interface of the B Type, the ID pin on the interface is suspended, and the CC pin on the Type-C interface is also suspended.

OTG (On-The-Go, ready to install) data line: the device supporting the OTG function can be connected with USB devices such as a U disk, a mouse and a keyboard through an OTG data line, data can be directly searched by connecting the U disk, the mouse is connected to play games, the keyboard is connected to quickly type, and a camera is connected to directly browse pictures, namely shooting and transmitting. That is to say, the OTG data line can make the device become the master device, one end of the OTG data line is a standard USB interface (for example, an a/B Type USB interface), and the other end of the OTG data line can be different according to different types of charging interfaces of the electronic device, for example, it can be an a Type Min USB interface, an a Type Micro USB interface, or a Type-C interface, where, regardless of the a Type Min USB interface or the a Type Micro USB interface, the ID pins on the interfaces are all grounded, and the CC pin on the Type-C interface is also grounded.

PMU (Power Management Unit): the power management scheme is highly integrated and is specific to portable applications, namely, several types of traditionally separated power management chips, such as a low dropout linear regulator and a direct current/direct current converter (DC/DC), are integrated into a power management unit of the electronic device, so that higher power conversion efficiency and lower power consumption can be realized, and the number of components is reduced to adapt to the reduced board-level space, and the cost is lower.

As follows, the present invention can be explained by a plurality of embodiments, fig. 1 is a schematic structural diagram of a reset circuit of an electronic device provided by an embodiment of the present invention, as shown in fig. 1, the reset circuit includes: a charging interface 101, a protection circuit 102 and a main chip 103; a power supply pin of the charging interface 101 is connected with a power supply management unit PMU104 of the electronic device, the PMU104 is connected with a rechargeable battery 105 of the electronic device, and the PMU104 is connected with a power supply pin of the main chip 103;

the OTG pin of the charging interface 101 is connected to the node of the protection circuit 102, and the node of the protection circuit 102 is connected to the reset pin of the main chip 103, so that after the OTG data line 106 externally connected to the charging interface 101 is pulled out, the OTG pin is triggered to output a reset signal to the reset pin.

Specifically, the charging interface 101 on the electronic device may be generally referred to as a USB (Universal Serial Bus) interface, and the USB interface has a hot plug function, and may transmit and communicate data with an external device through a USB data line connected to the USB interface, or may be used to charge itself. That is, the charging interface 101 may perform data transmission and charging through the USB data line. The Type of the charging interface 101 may be different according to different electronic devices, for example, the Type of the charging interface 101 of an electronic device with Android (Android operating system) is generally a Micro USB interface that can be inserted on a single side and a USB Type-C interface that can be inserted on a double side; the charging interface 101 of the electronic device installed with an IOS (apple operating System) is a lightning interface. The utility model provides a type of interface 101 that charges as long as can support OTG (On-The-Go, use promptly On The ann) function can, that is to say, The pin of interface 101 that charges will include The OTG pin at least, and The specific type of interface 101 that charges is not injectd to this place.

The pins of the charging interface 101 may include a power pin, an OTG pin, a data pin, and a ground pin, where the OTG pin has different definitions according to different types of the charging interface 101, for example, when the charging interface 101 is a Micro USB interface or a Min USB interface, the OTG pin refers to a fourth pin, i.e., an ID pin, in the Micro USB interface or the Min USB interface, and when the charging interface 101 is a Type-C interface, the OTG pin refers to an a5 pin and a B5 pin, i.e., a CC pin, in the Type-C interface. The utility model discloses use interface 101 that charges to explain as the example for the Micro USB interface, other types charge interface 101 similar, the embodiment of the utility model provides an no longer explain other types of interface 101 that charges.

When the type of the charging interface 101 is a Micro USB interface, a power pin on the charging interface 101 may be connected to the rechargeable battery 105 through the power management unit PMU104, and the power management unit PMU104 is further connected to a power pin of the main chip 103. The main chip 103 may be a CPU (Central Processing Unit), and of course, the power management Unit PMU104 may also be connected to other chips, for example, the power management Unit PMU104 may also be connected to a radio frequency chip and a sound collection chip on the electronic device (not shown in fig. 1). When the electronic device needs to be charged, an external power supply can be connected through the charging interface 101 and the USB data line, the power management unit PMU104 can monitor whether the external power supply is connected and whether the rechargeable battery 105 starts to be charged, and can control how fast the rechargeable battery 105 is charged, for example, when it is detected that the rechargeable battery 105 has a low electric quantity, the charging speed of the rechargeable battery 105 can be increased; when a large charge of the rechargeable battery 105 is detected, the charging speed of the rechargeable battery 105 may be reduced. After the electric quantity of the rechargeable battery 105 meets a certain condition, the electric quantity can be provided to the power management unit PMU104, and the power management unit PMU104 controls the power of other chips on the electronic device through connection with the other chips on the electronic device to provide power voltage suitable for the chip.

When the type of the charging interface 101 is a Micro USB interface, an OTG pin (ID pin) on the charging interface 101 may be connected to a reset pin of the main chip 103 through a node a of the protection circuit 102, and when the charging interface 101 is connected to the OTG data line 106, the level of the reset pin of the main chip 103 may be changed to a low level by using a function that the ID pin of the Micro USB interface on the OTG data line 106 is connected to a ground pin thereof, and then the OTG data line 106 is pulled out from the charging interface 101, so that the level of the reset pin of the main chip 103 is changed to a high level. That is to say, after the OTG data line 106 is plugged into the charging interface 101 and then pulled out from the charging interface 101, the OTG pin is triggered to output a reset signal to the reset pin of the main chip 103, where the reset signal is equivalent to a signal changing from a low level to a high level, so that data on the main chip 103 can be cleared without power interruption, and the electronic device can be restarted. And because the ID pin on the Micro USB interface on the USB data line is suspended, when the electronic device is charged or data is copied through the USB data line, the OTG pin on the charging interface 101 is not triggered to output a reset signal to the reset pin of the main chip 103, so that the electronic device is restarted, so that the electronic device can not only realize the functions of charging and copying data through the charging interface 101, but also realize the function of resetting through the charging interface 101 under the existing charging interface 101.

The reset circuit of the electronic device shown in fig. 1 may include: the charging interface, the protection circuit and the main chip are connected; the power pin of the charging interface is connected with a Power Management Unit (PMU) of the electronic equipment, the PMU is connected with a rechargeable battery of the electronic equipment, and the PMU is connected with the power pin of the main chip; the OTG pin of the charging interface is connected with the node of the protection circuit, and the node of the protection circuit is connected with the reset pin of the main chip, so that the OTG pin is triggered to output a reset signal to the reset pin after the OTG data wire externally connected with the charging interface is pulled out. Adopt the embodiment of the utility model provides an above-mentioned electronic equipment's reset circuit is connected to protection circuit's node through the OTG pin that will charge the interface on, then is connected to main chip's reset pin through this node again. Because the ID pin at one end of the OTG data line corresponding to the charging interface is grounded, the OTG data line can be externally connected to the charging interface, and then the level at the reset pin of the main chip is changed (the low level is changed into the high level) when the OTG data line is pulled out, so that the main chip is reset. Therefore, the electronic equipment can be reset without specially arranging a reset key (such as a pinhole key) on the electronic equipment PCB, the space on the electronic equipment PCB can be saved, the electronic equipment is easy to realize miniaturization, and a user can conveniently reset.

Fig. 2 is a schematic structural diagram of a reset circuit of another electronic device according to an embodiment of the present invention, as shown in fig. 2, an OTG pin of the charging interface 101 is connected to a node of the protection circuit 102, and the node of the protection circuit 102 is further connected to a reset pin of the PMU 104.

Specifically, when the type of the charging interface 101 is a Micro USB interface, an OTG pin (ID pin) on the charging interface 101 may also be connected to a reset pin of the PMU104 through a node of the protection circuit 102. That is, the OTG pin (ID pin) on charging interface 101 may be connected to the reset pin of main chip 103 and the reset pin of PMU104 through nodes of protection circuit 102, respectively. The explanation of the OTG pin (ID pin) on the charging interface 101 that can be connected to the reset pin of the main chip 103 through the node of the protection circuit 102 to reset the electronic device is described above, and will not be explained here. After the OTG data line 106 externally connected to the charging interface 101 is unplugged, the OTG pin on the charging interface 101 is triggered to output a reset signal to the reset pin of the main chip 103, and the reset signal may also be simultaneously transmitted to the reset pin of the PMU 104. That is to say, after the OTG data line 106 is plugged into the charging interface 101 and then pulled out from the charging interface 101, the level at the reset pin of the PMU104 may be changed from a high level to a low level to trigger the PMU104 to perform a reset operation, so that data on other chips connected to the PMU104 may be cleared, which is equivalent to simultaneously resetting other application programs on the electronic device, and thus, the electronic device may be restarted in this way under the condition that the electronic device is halted seriously.

Fig. 3 is a schematic structural diagram of a reset circuit of another electronic device according to an embodiment of the present invention, as shown in fig. 3, the reset circuit further includes an anti-static unit 301, an OTG pin of the charging interface 101 and a node a of the protection circuit 102 are connected to one end of the anti-static unit 301, the other end of the anti-static unit 301 is grounded, and the protection circuit 102 may include: a voltage dividing resistor 302 and a capacitor 303; one end of the voltage dividing resistor 302 is connected to a preset dc power supply 304, the other end of the voltage dividing resistor 302 is grounded through a capacitor 303, and the other end of the voltage dividing resistor 302 is a node a of the protection circuit 102.

Specifically, since ESD (Electro-Static discharge) inevitably enters a circuit of the electronic device, and further damages devices in the circuit of the electronic device are caused, the anti-Static unit 301 needs to be disposed in the electronic device. ESD typically enters the circuitry of an electronic device through a location that includes: earphones, microphone circuits, data interfaces, power interfaces, USB interfaces, and the like, which may introduce static electricity of a human body into the electronic device. The utility model discloses in, the user need insert or dial out OTG data line 106 from the interface 101 that charges, so need connect antistatic unit 301 in the OTG pin department of interface 101 that charges, can make main chip 103 avoid like this because the user inserts or dial out the OTG data line 106 from the interface 101 that charges, introduce this electronic equipment and the damage that brings with human static. The anti-static unit 301 may be a Gas Discharge Tube (GDT), a Voltage Dependent Resistor (VDR), a Thyristor (TSS), a Transient Voltage Suppressor (TVS), and the specific device type of the anti-static unit 301 is not limited in the present invention.

One end of the anti-static unit 301 is further connected to the node a of the protection circuit 102, the voltage dividing resistor 302 in the protection circuit 102 is a pull-up resistor, and when the OTG data line 106 is pulled out from the charging interface 101, the voltage level at the reset pin of the main chip 103 will become a high level due to the voltage dividing resistor 302 and the preset dc power supply 304. One end of the capacitor 303 is connected to the node a of the protection circuit 102, and the other end is grounded, so that the capacitor 303 can eliminate the phenomenon that the reset signal is unstable due to jitter generated when a user inserts or pulls off the OTG data line 106 at the charging interface 101, and further, the electronic device that is halted can be restarted.

Fig. 4 is a schematic structural diagram of a reset circuit of another electronic device according to an embodiment of the present invention, as shown in fig. 4, a preset dc power supply 304 may be connected to the PMU 104.

Specifically, the power supply voltage required by the preset dc power supply 304 may be provided by the PMU104, and the PMU104 may convert the voltage of the rechargeable battery 105 into the voltage required by the preset dc power supply 304, generally, the power supply voltage required by the preset dc power supply 304 is 3.3V, and the power supply voltage of the rechargeable battery 105 is (3.7V-4.2V), so that the PMU104 needs to step down the voltage from the rechargeable battery 105 to obtain the 3.3V voltage required by the preset dc power supply 304. In another embodiment, the supply voltage of the preset dc power supply 304 may be provided by a separate power supply. The present invention does not limit the power supply form of the preset dc power supply 304.

Optionally, the charging interface 101 is a USB interface having an ID pin, and the ID pin is the OTG pin. Specifically, the USB interface with the ID pin may include a Mini USB interface and a Micro USB interface, when the charging interface 101 is the Mini USB interface, the corresponding OTG data line is a Mini USB-OTG data line, and when the charging interface 101 is the Micro USB interface, the corresponding OTG data line is a Micro USB-OTG data line, that is, the type of the OTG data line needs to correspond to the type of the charging interface 101.

Fig. 5 is a schematic structural diagram of a specific reset circuit of an electronic device, as shown in fig. 5, an OTG pin of the charging interface 101 and a node a of the protection circuit 102 are connected to one end of a voltage dependent resistor 501, the other end of the voltage dependent resistor 501 is grounded, one end of a pull-up resistor 502 in the protection circuit 102 is connected to a preset dc power supply 304, the other end of the pull-up resistor 502 is grounded through a capacitor 303, and the other end of the pull-up resistor 502 is the node a of the protection circuit 102. The pull-up resistor 502 may have a resistance of 1K Ω, and the capacitor 303 may have a size of 100 nF. Node a is connected to the reset pin of main chip 103 and the reset pin of PMU104, respectively. A power supply pin of the charging interface 101 is connected with a power supply management unit PMU104, the PMU104 is connected with a rechargeable battery 105, and the PMU104 is connected with a power supply pin of the main chip 103. When the type of the charging interface 101 is a Micro USB interface, an OTG pin (ID pin) on the charging interface 101 may be connected to a reset pin of the main chip 103 through a node a of the protection circuit 102, and when the charging interface 101 is connected to the OTG data line 106, the level at the reset pin of the main chip 103 and the level at the reset pin of the PMU104 may be respectively changed to a low level by using a function that the ID pin of the Micro USB interface on the OTG data line 106 is connected to a ground pin thereof, and then the OTG data line 106 is pulled out from the charging interface 101, so that the level at the reset pin of the PMU104 and the level at the reset pin of the main chip 103 are changed to a high level. That is, the data on the main chip 103 can be cleared, and at the same time, the data on other chips connected to the PMU104 can be cleared, so that the electronic device is restarted.

The utility model also provides an electronic device, which comprises the reset circuit in the above embodiment, wherein the power pin of the charging interface in the reset circuit is connected with the PMU, and the PMU is connected with the rechargeable battery in the reset circuit; the PMU is also connected with a power supply pin of a main chip in the reset circuit. This electronic equipment can be wearable electronic equipment, like other wearable electronic equipment such as intelligent bracelet, intelligent recording pen, chest card formula recording equipment.

The chest card type recording equipment is wearable electronic equipment combining other technologies such as information technology and microelectronic technology, can sense the external environment (sound) through a built-in sensor, processes the sensed information through a specific acquisition module, and transmits and feeds back the processed information (sound) by using wireless communication equipment. This chest card formula recording equipment can supervise staff's daily work, can improve staff's work efficiency, so this chest card formula recording equipment has fine scene that should. The chest card formula recording equipment that the design theory that utilizes to contain above-mentioned reset circuit designed can cancel the button that resets on its PCB, after the button that resets cancels, can save the PCB space, improves PCB's wiring density, and then can make the whole quick-witted size of this chest card formula recording equipment littleer, more accords with wearable equipment's theory. When the chest card type recording equipment is halted, the chest card type recording equipment can be restarted directly through the charging interface of the chest card type recording equipment and the OTG data line, so that the chest card type recording equipment enters a normal working state again.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A reset circuit of an electronic device, the reset circuit comprising: the charging interface, the protection circuit and the main chip are connected; the power pin of the charging interface is connected with a Power Management Unit (PMU) of the electronic equipment, the PMU is connected with a rechargeable battery of the electronic equipment, and the PMU is connected with the power pin of the main chip;

2. The circuit of claim 1, the OTG pin of the charging interface is connected to a node of the protection circuit, the node of the protection circuit is also connected to a reset pin of the PMU.

3. The circuit of claim 1, wherein the reset circuit further comprises: an antistatic unit; one end of the anti-static unit is connected with the OTG pin, and the other end of the anti-static unit is grounded.

4. The circuit of claim 1, wherein the protection circuit further comprises: a voltage dividing resistor and a capacitor; one end of the divider resistor is connected with a preset direct-current power supply, the other end of the divider resistor is grounded through the capacitor, and the other end of the divider resistor is a node of the protection circuit.

5. The circuit of claim 4, wherein the predetermined DC power supply is coupled to the PMU.

6. The circuit of any of claims 1-5, wherein the charging interface is a USB interface having an ID pin, and the ID pin is the OTG pin.

7. An electronic device, comprising: reset circuit, power management unit PMU, rechargeable battery according to any of the preceding claims 1-6;

a power supply pin of the charging interface in the reset circuit is connected with the PMU, and the PMU is connected with the rechargeable battery; the PMU is also connected with a power supply pin of the main chip in the reset circuit.

8. The electronic device of claim 7, wherein the electronic device is a wearable electronic device.

9. The electronic device of claim 8, wherein the wearable electronic device is a chest card recording device.