A circuit control architecture for a wearable device and the wearable device itself.

Abstract

This invention provides a circuit control architecture for a wearable device and the wearable device itself. The architecture includes: a first multi-functional contact, a second multi-functional contact, and an ECG acquisition contact. The first multi-functional contact is connected to an internal power supply module via a first switching unit, and to a system processing chip via the first switching unit and a first isolation module, and to an ECG detection chip via a second isolation module. The second multi-functional contact is connected to an internal ground terminal via a second switching unit and directly connected to the ECG detection chip. The ECG acquisition contact is directly connected to the ECG detection chip. A switch control module controls the switching on and off of the first and second switching units based on the voltage at its own power supply terminal. A power supply circuit module constructs a power supply circuit from the first multi-functional contact to the aforementioned power supply terminal, to the internal ground terminal, and to the second multi-functional contact. This invention requires only three metal contacts to realize the device's charging, communication, and ECG detection functions, thus saving the number of metal contacts required for the wearable device.

Description

Technical Field

[0001] This invention relates to the field of electronic circuits, and more particularly to a circuit control architecture for a wearable device and the wearable device itself. Background Technology

[0002] More and more wearable devices, such as smart rings, smartwatches, and smart bracelets, are considering adding electrocardiogram (ECG) detection functionality. To achieve ECG detection, the wearable device's casing needs at least two acquisition contacts and one output contact to serve as electrodes for detecting ECG signals. Furthermore, because wearable devices must also have charging and communication functions, the casing also needs at least two communication contacts, one power contact, and one ground contact.

[0003] Therefore, existing wearable devices need at least seven metal contacts to combine ECG monitoring, charging, and communication functions. However, adding seven metal contacts not only affects the aesthetics of the wearable device but also increases the cost and may even increase the susceptibility of the internal circuitry to external environmental influences.

[0004] Therefore, enabling wearable devices to combine ECG monitoring, charging, and communication functions with fewer metal contacts has become a pressing technical challenge for the industry. Summary of the Invention

[0005] This invention provides a circuit control architecture for a wearable device and a wearable device in order to solve the problems existing in existing wearable devices.

[0006] To address the aforementioned technical problems, the present invention provides a circuit control architecture for a wearable device, used to control the charging of the internal power supply module, the external communication of the system processing chip, and the electrocardiogram (ECG) detection of the ECG detection chip. The circuit control architecture includes:

[0007] First multi-function contact, second multi-function contact, and ECG acquisition contact;

[0008] A first switching unit and a second switching unit, wherein the first end of the first switching unit is coupled to the first multi-function contact and the input pin of the internal power supply module, respectively; and the first end of the second switching unit is coupled to the second multi-function contact and the internal ground terminal, respectively.

[0009] A switch control module is respectively coupled to the first multi-function contact, the second multi-function contact, the control terminal of the first switch unit, and the control terminal of the second switch unit. The switch control module is used for:

[0010] When the first voltage between its own power supply terminal and the internal ground terminal is greater than the operating voltage, the first switch unit and the second switch unit are both controlled to be turned on; and when the first voltage is less than the operating voltage, the first switch unit and the second switch unit are both controlled to be turned off.

[0011] The second voltage between the first multi-function contact and the second multi-function contact is compared with the overvoltage threshold voltage, and the first switching unit and the second switching unit are turned off according to the comparison result, wherein the overvoltage threshold voltage is greater than the operating voltage;

[0012] The power supply circuit module includes a first resistive unit and a first diode unit. The first end and the second end of the first resistive unit are respectively coupled to the first multi-function contact and the power supply terminal of the switch control module. The positive terminal of the first diode unit is connected to the internal ground terminal, and the negative terminal of the first diode unit is connected to the second multi-function contact.

[0013] The system processing chip is used to output a third voltage to the power supply terminal of the switch control module through a first output pin when communicating with an external communication device. The third voltage is greater than the operating voltage and less than the overvoltage threshold voltage.

[0014] A first isolation module is coupled between the second terminal of the first switching unit and the communication pin of the system processing chip. The first isolation module is used to turn off when the second terminal of the first switching unit is at a high level and to turn on when the second terminal of the first switching unit is at a low level.

[0015] The second isolation module has its first and second ends connected to the first multi-functional contact and the first acquisition pin of the electrocardiogram detection chip, respectively; the second isolation module is used to protect the first acquisition pin from damage by high voltage.

[0016] The second acquisition pin of the electrocardiogram (ECG) detection chip is connected to the ECG acquisition contact, and the output pin of the ECG detection chip is connected to the second multi-functional contact.

[0017] Optionally, the circuit control architecture of the wearable device further includes: a second diode unit and a third diode unit; the positive terminal of the second diode unit is connected to the first terminal of the first resistive unit, and the negative terminal of the second diode unit is connected to the power supply terminal of the switch control module; the negative terminal of the third diode is connected to the power supply terminal of the switch control module, and the positive terminal of the third diode is connected to the first output terminal of the system processing chip.

[0018] Optionally, the circuit control architecture of the wearable device further includes: a first voltage regulation and protection unit, which is coupled between the power supply terminal of the switch control module and the internal ground terminal. The first voltage regulation and protection unit is used to clamp the power supply terminal of the switch control module within a third voltage, which is between the operating voltage and the overvoltage threshold voltage.

[0019] Optionally, the second isolation module includes a second resistive unit and a second voltage regulation protection unit. The first end and the second end of the second resistive unit are respectively coupled to the first multi-function contact and the first acquisition pin of the electrocardiogram detection chip. The first end of the second voltage regulation protection unit is coupled to the second end of the second resistive unit, and the second end of the second voltage regulation protection unit is coupled to the second multi-function contact. The second voltage regulation protection unit is used to clamp the voltage at the second end of the second resistive unit within a first withstand voltage. The first withstand voltage is used to characterize the upper limit of the withstand voltage of the first acquisition pin of the electrocardiogram detection chip.

[0020] Wherein, the ratio between the first impedance and the second impedance is greater than a first threshold, the first impedance is used to characterize the input impedance of the first acquisition pin, and the second impedance is used to characterize the sum of the impedances of the first acquisition pin and the second resistive unit connected in series.

[0021] Optionally, the second isolation module includes a second resistive unit, a second voltage regulation and protection unit, an operational amplifier unit, and an operational amplifier switch control unit; the first and second ends of the second resistive unit are respectively coupled to the first multi-function contact and the non-inverting input of the operational amplifier unit; the first end of the second voltage regulation and protection unit is coupled to the second end of the second resistive unit, and the second end of the second voltage regulation and protection unit is coupled to the second multi-function contact; the second voltage regulation and protection unit is used to clamp the voltage at the second end of the second resistive unit within a second withstand voltage, which is used to characterize the upper limit of the withstand voltage of the non-inverting input of the operational amplifier unit; the output end of the operational amplifier unit is respectively connected to its own inverting input and the first acquisition pin of the ECG detection chip; the operational amplifier switch control unit is used to enable the operational amplifier unit during ECG detection and to disable the operational amplifier unit after ECG detection is completed.

[0022] Wherein, the ratio between the first impedance and the second impedance is less than the first threshold, and the ratio between the third impedance and the fourth impedance is greater than the first threshold. The third impedance is used to characterize the input impedance of the non-inverting input terminal, and the fourth impedance is used to characterize the sum of the impedances of the non-inverting input terminal and the second resistive unit connected in series.

[0023] Optionally, the second isolation module further includes a third switching unit, wherein the first and second terminals of the third switching unit are respectively connected to the non-inverting input and output terminals of the operational amplifier unit; the operational amplifier switching control unit is used for:

[0024] When charging the internal power supply module or when the system processing chip is communicating with the outside world, the third switching unit is turned off and the operational amplifier unit is disabled.

[0025] When the internal power supply module is not charging, the system processing chip is not communicating with the outside, or the ECG detection chip is not performing ECG detection, the third switching unit is turned on and the operational amplifier unit is turned off.

[0026] When performing ECG detection using the ECG detection chip, the third switching unit is turned off and the operational amplifier unit is enabled.

[0027] Optionally, the second voltage regulation and protection unit includes a bidirectional voltage regulator.

[0028] Optionally, the second isolation module includes an operational amplifier unit, a third switching unit, and an operational amplifier switch control unit; the non-inverting input terminal of the operational amplifier unit is coupled to the first multi-function contact, and the output terminal of the operational amplifier unit is connected to its own inverting input terminal and the first acquisition pin of the electrocardiogram detection chip, respectively; the first and second terminals of the third switching unit are respectively connected to the non-inverting input terminal and the output terminal of the operational amplifier unit; the operational amplifier switch control unit is used for:

[0029] When charging the internal power supply module or when the system processing chip is communicating with the outside world, the third switching unit is turned off and the operational amplifier unit is disabled.

[0030] When the internal power supply module is not charging, the system processing chip is not communicating with the outside, or the ECG detection chip is not performing ECG detection, the third switching unit is turned on and the operational amplifier unit is turned off.

[0031] When performing ECG detection using the ECG detection chip, the third switching unit is turned off and the operational amplifier unit is enabled.

[0032] Wherein, the withstand voltage capability of the operational amplifier unit and the withstand voltage capability of the third switching unit are both greater than the second threshold, the second threshold is greater than the charging voltage, and the charging voltage is used to characterize the voltage on the first multi-functional contact when the internal power supply module is charged.

[0033] Optionally, the shutdown leakage current of the first switching unit, the second switching unit, and the third switching unit is less than or equal to a third threshold.

[0034] Optionally, the first isolation module includes an isolation NMOS transistor and a third resistive unit; the gate of the isolation NMOS transistor is connected to the input voltage of the system processing chip, the source of the isolation NMOS transistor is coupled to the first terminal of the third resistive unit and the communication pin of the system processing chip respectively, and the drain of the isolation NMOS transistor is coupled to the second terminal of the first switching unit; the second terminal of the third resistive unit is also connected to the input voltage of the system processing chip.

[0035] The present invention also provides a wearable device, including the circuit control architecture of the wearable device.

[0036] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0037] The circuit control architecture of the wearable device provided by this invention connects the first multi-function contact and the power supply terminal of the switch control module through a first resistive unit, and connects the internal ground terminal of the wearable device and the second multi-function contact through a first diode unit, thereby constructing a power supply loop from the first multi-function contact to the power supply terminal of the switch control module, to the internal ground terminal, and back to the second multi-function contact. When the first voltage between the power supply terminal of the switch control module and the internal ground terminal is greater than the operating voltage, it indicates that the internal power supply module needs to be charged or communication with the system processing chip is required. At this time, the switch control module controls both the first and second switch units to be turned on. Furthermore, because the first isolation module is used to disconnect the connection between the second terminal of the first switch unit and the communication pin of the system processing chip when the second terminal of the first switch unit is at a high level, it ensures that the communication pin of the system processing chip will not be damaged by the high voltage during charging. Therefore, the first multi-function contact can be directly connected to the input pin of the internal power supply module and connected to the communication pin of the system processing chip through the first isolation module, thereby enabling the first multi-function contact to multiplex charging and communication contacts. When the first voltage is lower than the operating voltage, the switch control module controls both the first and second switch units to turn off, thereby preventing the internal power supply module and the system processing chip from affecting the detection of the electrocardiogram (ECG) signal. Furthermore, because the second isolation module protects the first acquisition pin from high voltage damage, preventing high voltage on the first multi-function contact from damaging the ECG detection chip, the first multi-function contact can also be connected to the first acquisition pin of the ECG detection chip through the second isolation module, thus enabling the first multi-function contact to be reused as an ECG acquisition contact.

[0038] Because the output pins of the ECG detection chip are not easily affected by external noise, the second multi-functional contact can be connected to both the internal ground and the output pins of the ECG detection chip, thus multiplexing the second multi-functional contact as both an ECG detection output contact and a ground contact. Furthermore, because the ECG acquisition contact is connected to the second acquisition pin of the ECG detection chip, the circuit control architecture of this invention only requires the first multi-functional contact, the second multi-functional contact, and the ECG acquisition contact to control the charging of the internal power supply module, the external communication of the system processing chip, and the ECG detection of the ECG detection chip, thereby greatly reducing the number of metal contacts required for wearable devices.

[0039] Furthermore, by setting the second diode unit and the third diode unit, it is ensured that when the first multi-function contact and the second multi-function contact are reverse-connected to charge the internal power supply module, a power-carrying circuit from the second multi-function contact to the first multi-function contact will not be formed, thereby ensuring that the electrocardiogram detection chip, the switch control module, and the system processing chip will not be damaged by the reverse current.

[0040] Furthermore, by setting the first voltage regulation protection unit, the power supply voltage of the switch control module is clamped within a third voltage, which is between the operating voltage and the overvoltage threshold voltage. Therefore, when the second voltage between the first multi-function contact and the second multi-function contact is greater than the overvoltage threshold voltage, the switch control module will operate normally because the power supply voltage is clamped within the overvoltage threshold voltage.

[0041] Furthermore, by setting the second voltage regulation protection unit as a bidirectional voltage regulator, leakage current can be prevented from the output pin of the electrocardiogram detection chip to the first acquisition pin of the electrocardiogram detection chip.

[0042] Furthermore, the third switching unit is configured, and the operational amplifier switch control unit controls the third switching unit to conduct when the internal power supply module is not charging, the system processing chip is not communicating externally, or the ECG detection chip is not performing ECG detection. This establishes a direct connection between the first multi-functional contact and the first acquisition pin of the ECG detection chip, so that when ECG detection is required, the ECG detection chip can quickly detect the input ECG signal. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the circuit structure of the wearable device circuit control architecture provided in the embodiments of the present invention. Figure 1 ;

[0044] Figure 2This is a schematic diagram of the circuit structure of the wearable device circuit control architecture provided in the embodiments of the present invention. Figure 1 ;

[0045] Figure 3 This is a schematic diagram of the circuit structure of the wearable device circuit control architecture provided in the embodiments of the present invention. Figure 2 ;

[0046] Figure 4 This is a schematic diagram of the circuit structure of the wearable device circuit control architecture provided in the embodiments of the present invention. Figure 4 ;

[0047] Figure 5 This is a schematic diagram of the circuit structure of the wearable device circuit control architecture provided in the embodiments of the present invention. Figure 5 ;

[0048] Figure 6 This is a schematic diagram of the circuit structure of the wearable device circuit control architecture provided in the embodiments of the present invention. Figure 6 ;

[0049] Figure 7 This is a schematic diagram of the circuit structure of the wearable device circuit control architecture provided in the embodiments of the present invention. Figure 7 ;

[0050] Figure 8 This is a schematic diagram of the circuit structure of the wearable device circuit control architecture provided in the embodiments of the present invention. Figure 8 . Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of the present invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the present invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0052] Currently, an increasing number of wearable devices, such as smart rings, smartwatches, and smart bracelets, are considering adding electrocardiogram (ECG) detection functionality. To achieve this, metal contacts need to be added to the outer casing of the wearable device to connect to the internal circuitry, serving as electrodes for detecting ECG signals. Wearable devices typically require a first acquisition electrode, a second acquisition electrode, and a right leg drive electrode for ECG detection. The first and second acquisition electrodes collect weak ECG signals from the human body and transmit them to the internal ECG detection chip. The right leg drive electrode outputs a common-mode interference suppression signal from the ECG detection chip to the human body to suppress common-mode noise interference caused by noise affecting the ECG signals collected by the two acquisition contacts. Therefore, wearable devices need at least three metal contacts to achieve ECG detection. Since the internal circuitry of the ECG detection chip is a conventional technique in this field, it will not be described in detail here.

[0053] In addition to electrocardiogram (ECG) monitoring, wearable devices must also have charging and communication capabilities. Charging typically requires charging electrodes and a ground electrode. The charging electrodes connect to the output of an external power supply and to the input of the device's internal power supply module. The ground electrode connects to the ground of the external power supply and to the ground of the device's internal power supply module, forming a charging circuit between the external power supply and the device's power supply module. Therefore, a wearable device needs at least two metal contacts to achieve charging. Similarly, communication typically requires two communication electrodes and a ground electrode. Since the ground electrode can be shared, a wearable device also needs at least two metal contacts to achieve communication.

[0054] As mentioned above, wearable devices need at least seven metal contacts to function as ECG monitors, chargers, and external communication devices. However, having seven metal contacts presents the following problems:

[0055] 1. To ensure that the metal contacts maintain good electrical performance and improve their oxidation resistance, the metal contacts are generally gold-plated. Each metal contact occupies an area of ​​the appearance structure. Therefore, setting 7 metal contacts will not only greatly increase the cost of wearable devices, but also affect the aesthetics of wearable devices.

[0056] 2. In existing wearable devices, the first data acquisition contact and the right leg drive contact are typically located on the bottom surface of the inner ring of the device, in contact with the human skin, for electrocardiogram (ECG) detection. Similarly, the charging and communication contacts of existing wearable devices are also typically located on the bottom surface of the inner ring, in contact with the human skin. Therefore, electrical noise present on the charging or communication contacts can be transmitted through the skin to the first data acquisition contact and the right leg drive contact. Since the amplitude of ECG signals is extremely weak, typically only one or two millivolts, this electrical noise can severely affect the detection accuracy of the ECG signal.

[0057] In view of this, embodiments of the present invention provide a new circuit control architecture for wearable devices, which can control the charging of the internal power supply module, the external communication of the system processing chip, and the electrocardiogram detection of the electrocardiogram detection chip through only three metal contacts.

[0058] in, Figure 1 This is a schematic diagram of the circuit structure of the wearable device circuit control architecture provided in the embodiments of the present invention. Figure 1 .

[0059] Please refer to Figure 1 The circuit control architecture of the wearable device provided in this embodiment of the invention includes:

[0060] First multi-function contact VBUS _ COM _ LA, second multi-function contact GND _ RLD and ECG acquisition contact RA;

[0061] A first switching unit 40 and a second switching unit 50 are respectively coupled to the first multi-function contact VBUS_COM_LA and the input pin of the internal power supply module 10; the first and second ends of the second switching unit 50 are respectively coupled to the second multi-function contact GND_RLD and the internal ground GND.

[0062] A switch control module 60 is coupled to the first multi-function contact VBUS_COM_LA, the second multi-function contact GND_RLD, the control terminal of the first switch unit 40, and the control terminal of the second switch unit 50, respectively. The switch control module 60 is used for:

[0063] When the first voltage between its own power supply terminal VCCEN and the internal ground terminal GND is greater than the operating voltage, the first switch unit 40 and the second switch unit 50 are both turned on, and when the first voltage is less than the operating voltage, the first switch unit 40 and the second switch unit 50 are both turned off.

[0064] The second voltage between the first multi-function contact VBUS_COM_LA and the second multi-function contact GND_RLD is compared with the overvoltage threshold voltage, and the first switching unit 40 and the second switching unit 50 are controlled to turn off according to the comparison result, wherein the overvoltage threshold voltage is greater than the operating voltage;

[0065] The power supply circuit module includes a first resistive unit 71 and a first diode unit 72. The first end and the second end of the first resistive unit 71 are respectively coupled to the first multi-function contact VBUS_COM_LA and the power supply terminal VCCEN of the switch control module. The positive terminal of the first diode unit 72 is connected to the internal ground terminal GND, and the negative terminal of the first diode unit 72 is connected to the second multi-function contact GND_RLD.

[0066] The system processing chip 20 is used to output a third voltage to the power supply terminal VCCEN of the switch control module through the first output pin GPIO1 when communicating with an external communication device. The third voltage is greater than the operating voltage.

[0067] A first isolation module 80 is coupled between the second terminal of the first switching unit 40 and the communication pin COM of the system processing chip 20. The first isolation module 80 is used to turn off when the second terminal of the first switching unit 40 is at a high level and to turn on when the second terminal of the first switching unit 40 is at a low level.

[0068] The second isolation module 90, with its first and second ends respectively connected to the first multi-functional contact VBUS. _ COM _ LA and the first acquisition pin LA' of the electrocardiogram detection chip 30; the second isolation module 90 is used to protect the first acquisition pin LA' from being damaged by high voltage;

[0069] The second acquisition pin RA` of the electrocardiogram detection chip 30 is connected to the electrocardiogram acquisition contact RA, and the output pin RLD` of the electrocardiogram detection chip 30 is connected to the second multi-functional contact GND_RLD.

[0070] Through the above-described technical means, embodiments of the present invention can achieve electrocardiogram detection, charging, and external communication of wearable devices using only three metal contacts. The specific principle is as follows:

[0071] In this embodiment of the invention, the first multi-function contact VBUS_COM_LA and the power supply terminal VCCEN of the switch control module are connected through a first resistive unit 71, and the internal ground terminal GND of the wearable device and the second multi-function contact GND_RLD are connected through a first diode unit 72 to construct a power supply loop from the first multi-function contact VBUS_COM_LA to the power supply terminal VCCEN of the switch control module, to the internal ground terminal GND, and to the second multi-function contact GND_RLD. Therefore, the switch control module 60 is no longer powered by an internal voltage source, but is directly powered by the voltage difference between the first multi-function contact VBUS_COM_LA and the second multi-function contact GND_RLD.

[0072] When an external charging device needs to charge the internal power supply module 10, the first multi-function contact VBUS_COM_LA and the second multi-function contact GND_RLD are connected to the output terminal and ground terminal of the external charging device, respectively. Therefore, the voltage between the power supply terminal VCCEN of the switch control module and the internal ground terminal GND is greater than the operating voltage of the switch control module 60, so that the switch control module 60 controls both the first switch unit 40 and the second switch unit 50 to conduct, thereby realizing the charging of the internal power supply module 10. While the internal power supply module 10 is being charged, the first isolation module 80 disconnects the connection between the second terminal of the first switch unit 40 and the communication pin of the system processing chip 20 because the second terminal of the first switch unit 40 is at a high level, thereby preventing the communication pin from being damaged by high voltage. The second isolation module 90 also protects the first acquisition pin LA' from being damaged by high voltage during the charging of the internal power supply module 10. Therefore, in addition to being directly connected to the input pin of the internal power supply module 10, the first multi-function contact VBUS_COM_LA can also be indirectly connected to the communication pin COM of the system processing chip 20 and the first acquisition pin LA' of the electrocardiogram detection chip 30 through the first isolation module 80 and the second isolation module 90, respectively.

[0073] When an external communication device, such as the MCU of the external device, needs to communicate with the system processing chip 20 inside the device, the first multi-function contact VBUS_COM_LA and the second multi-function contact GND... _RLD is connected to the signal output pin RLD` of the external communication device and the ground terminal, respectively. Because the communication signal output by the external communication device is a digital signal switching between high and low levels, the voltage between the power supply terminal VCCEN of the switch control module and the internal ground terminal GND cannot stably maintain the normal operation of the switch control module 60. Therefore, the system processing chip 20 outputs a third voltage to the power supply terminal VCCEN of the switch control module. Since this third voltage is greater than the operating voltage of the switch control module 60, the switch control module 60 controls both the first switch unit 40 and the second switch unit 50 to be turned on. According to the working principle of the first isolation module 80, the first isolation module 80 will be turned on when the communication signal output by the external communication device is low to transmit logic zero, and turned off when the communication signal output by the external communication device is high to transmit logic one. Therefore, by turning on the first switch unit 40 and the second switch unit 50 and the working principle of the first isolation module 80, single-wire communication between the external communication device and the system processing chip 20 is realized, thereby multiplexing the first multi-function contact VBUS_COM_LA as a communication contact.

[0074] When performing an electrocardiogram (ECG) test, the voltage difference between the first multi-function contact VBUS_COM_LA and the second multi-function contact GND_RLD is insufficient to provide the operating voltage for the switch control module 60. Therefore, both the first switch unit 40 and the second switch unit 50 are turned off, completely isolating the internal power supply module 10 and the system processing chip 20 from the first multi-function contact VBUS_COM_LA. This prevents the internal power supply module 10 and the system processing chip 20 from affecting the ECG signal detection. Furthermore, because the first multi-function contact VBUS_COM_LA can be indirectly connected to the first acquisition pin LA' of the ECG detection chip 30 through the second isolation module 90, the first multi-function contact VBUS_COM_LA is also isolated. _ COM _ LA is multiplexed as the first acquisition contact. Furthermore, because the output pin RLD' of the ECG detection chip 30 has low output impedance and strong driving capability, it is not easily affected by external noise. Therefore, the second multi-functional contact GND_RLD can be directly connected to the output pin RLD' of the ECG detection chip 30, thus multiplexing the second multi-functional contact GND_RLD as the right leg drive contact. Finally, the ECG acquisition contact RA is connected to the second acquisition pin RA' of the ECG detection chip 30, so that the ECG acquisition contact RA normally functions as the second acquisition contact for ECG detection.

[0075] As described above, the circuit control architecture of the wearable device provided in this embodiment of the invention greatly reduces the impact of the internal power supply module 10 and the system processing chip 20 on the detection of electrocardiogram (ECG) signals, and ensures that the communication pin of the system processing chip 20 and the first acquisition pin LA' of the ECG detection chip 30 are not damaged by high voltage. Thus, only the first multi-functional contact VBUS_COM_LA, the second multi-functional contact GND_RLD, and the ECG acquisition contact RA are needed to control the charging of the internal power supply module 10, the external communication of the system processing chip 20, and the ECG detection of the ECG detection chip 30. That is, the wearable device achieves ECG detection, charging, and external communication through only three metal contacts, which greatly saves the number of metal contacts required for the wearable device compared to the prior art.

[0076] To make the above-mentioned objectives, features and beneficial effects of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0077] In one specific implementation, although the normal charging voltage is typically 5V, users may use other high-voltage chargers to charge wearable devices, resulting in an input voltage exceeding 5V. Therefore, the withstand voltage of the first switching unit 40, the second switching unit 50, and the switch control module 60 each needs to be set above 12V, and preferably support a high voltage withstand of 20V. Simultaneously, the on-resistance of the first switching unit 40 and the second switching unit 50 needs to be set below 100 milliohms to facilitate power channel switching during charging. Furthermore, the bandwidth of the first switching unit 40 and the second switching unit 50 needs to be set above 100MHz to facilitate digital channel switching during communication.

[0078] in, Figure 2 This is a schematic diagram of the circuit structure of the wearable device circuit control architecture provided in the embodiments of the present invention. Figure 2 .

[0079] Please refer to Figure 2 In one specific implementation, the circuit control architecture of the wearable device further includes: a second diode unit 100 and a third diode unit 110; the anode of the second diode unit 100 is connected to the first terminal of the first resistive unit 71, and the cathode of the second diode unit 100 is connected to the power supply terminal VCCEN of the switch control module; the cathode of the third diode unit 110 is connected to the power supply terminal VCCEN of the switch control module, and the anode of the third diode unit 110 is connected to the first output pin GPIO1 of the system processing chip 20. Both the second diode unit 100 and the third diode unit 110 are diodes.

[0080] By configuring the second diode unit 100 and the third diode unit 110, it can be ensured that the external power supply equipment is connected to the first multi-function contact VBUS. _ COM _ LA and the second multi-function contact GND _ When the RLD is reversed, the circuit control architecture will not be damaged by the negative input voltage.

[0081] The specific principle is as follows: First, when the external power supply device is reversed, the power supply terminal VCCEN of the switch control module is at zero voltage. Therefore, both the first switch unit 40 and the second switch unit 50 are turned off because the switch control module 60 is not working, thereby preventing the internal power supply module 10 from being damaged due to negative voltage.

[0082] Secondly, the high voltage on the second multi-function contact GND_RLD, when passing through the output pin RLD` of the ECG detection chip 30, the internal ground GND, and the power supply terminal VCCEN of the switch control module, will be blocked by the second diode unit 100, thus preventing the formation of a current loop from the second multi-function contact GND_RLD to the first multi-function contact VBUS_COM_LA. This avoids damage to the ECG detection chip 30 and the switch control module 60 due to negative voltage.

[0083] Finally, the third diode unit 110 will block the current from flowing back into the system processing chip 20, thereby preventing the system processing chip 20 from being damaged due to negative voltage.

[0084] in, Figure 3 This is a schematic diagram of the circuit structure of the wearable device circuit control architecture provided in the embodiments of the present invention. Figure 3 .

[0085] Please refer to Figure 3 In one specific embodiment, the circuit control architecture of the wearable device further includes: a first voltage regulation and protection unit 120, which is coupled between the power supply terminal VCCEN of the switch control module and the internal ground terminal GND. The first voltage regulation and protection unit 120 is used to clamp the power supply terminal VCCEN of the switch control module within a third voltage, which is between the operating voltage and the overvoltage threshold voltage. Specifically, the first voltage regulation and protection unit 120 is a Zener diode, with the cathode of the Zener diode connected to the power supply terminal VCCEN of the switch control module and the anode of the Zener diode connected to the internal ground terminal GND.

[0086] By configuring the first voltage regulator protection unit 120, the first multi-function contact VBUS can be activated. _ COM_ LA and the second multi-function contact GND _ When the voltage difference between RLD and GND exceeds the overvoltage threshold voltage, the power supply terminal VCCEN of the switch control module is clamped within a third voltage range to ensure that the switch control module 60 can operate normally even when there is an overvoltage between the first multi-function contact VBUS_COM_LA and the second multi-function contact GND_RLD. The overvoltage threshold voltage is set as the upper limit of the operating voltage of the switch control module 60, typically around 6V. Figure 4 This is a schematic diagram of the circuit structure of the wearable device circuit control architecture provided in the embodiments of the present invention. Figure 4 .

[0087] Please refer to Figure 4 In one specific implementation, the second isolation module 90 includes a second resistive unit 91 and a second voltage regulation protection unit 92. The first end and the second end of the second resistive unit 91 are respectively coupled to the first multi-function contact VBUS_COM_LA and the first acquisition pin LA` of the ECG detection chip 30. The first end of the second voltage regulation protection unit 92 is coupled to the second end of the second resistive unit 91, and the second end of the second voltage regulation protection unit is coupled to the second multi-function contact GND_RLD. The second voltage regulation protection unit 92 is used to clamp the voltage at the second end of the second resistive unit 91 within a first withstand voltage. The first withstand voltage is used to characterize the upper limit of the withstand voltage of the first acquisition pin LA` of the ECG detection chip 30.

[0088] Wherein, the ratio between the first impedance and the second impedance is greater than a first threshold, the first impedance is used to characterize the input impedance of the first acquisition pin LA', and the second impedance is used to characterize the sum of the impedances of the first acquisition pin LA' and the second resistive unit 91 connected in series.

[0089] Specifically, the second voltage regulation and protection unit 92 is a bidirectional Zener diode. The first positive terminal of the bidirectional Zener diode is connected to the second terminal of the second resistive unit 91, and the second positive terminal of the bidirectional Zener diode is connected to the second multi-functional contact GND. _ In addition to ensuring that the first acquisition pin LA' is not damaged by high charging voltage or sudden high voltage input through the bidirectional Zener diode, the bidirectional Zener diode can also prevent leakage current from the output pin RLD' of the ECG detection chip 30 to the first acquisition pin LA'.

[0090] In addition to preventing the first acquisition pin LA' from being damaged by high voltage, the power consumption of the second voltage regulation and protection unit 92 also needs to be considered. Therefore, the impedance of the second resistive unit 91 needs to be set to be very large, for example, between 10MΩ and 100MΩ, so that the current flowing through the second voltage regulation and protection unit 92 is as small as possible.

[0091] However, when performing ECG detection, the ECG detection chip 30 needs to be selected with a high pin input impedance to avoid the second resistive unit 91 drawing a large voltage that would affect the ECG detection. This is so that the voltage drawn by the second resistive unit 91 can be ignored. For example, if the impedance of the second resistive unit 91 is set between 10MΩ and 100MΩ, then the input impedance of the first acquisition pin LA' needs to reach at least 1GΩ, or even more than 10GΩ. Therefore, the first threshold specifically represents the minimum proportion of the input impedance of the first acquisition pin LA' without affecting the ECG detection. Since the specific value of the first threshold will vary with the actual environment and detection requirements, it is not limited here.

[0092] in, Figure 5 This is a schematic diagram of the circuit structure of the wearable device circuit control architecture provided in the embodiments of the present invention. Figure 5 .

[0093] Please refer to Figure 5 In one specific implementation, if the ECG detection chip 30 with a low pin input impedance is selected, which affects ECG detection, for example, the impedance of the second resistive unit 91 is between 10MΩ and 100MΩ, while the input impedance of the first acquisition pin LA' is less than 1GΩ, then an operational amplifier unit AMP with a large input impedance needs to be set between the second resistive unit 91 and the first acquisition pin LA' to ensure that the ECG detection is not affected by the second resistive unit 91. For example, the input impedance of the operational amplifier unit AMP can reach 1GΩ, or even more than 10GΩ.

[0094] Because the non-inverting input of the operational amplifier unit AMP is connected to the second terminal of the second resistive unit 91, and the output of the operational amplifier unit AMP is connected to the first acquisition pin LA` and its own inverting input, the connection method of the operational amplifier unit AMP enables it to enter voltage follower mode, that is, the ECG signal input to the non-inverting input terminal is equal to the ECG signal output from the output terminal, thereby greatly improving the driving capability and anti-interference capability of the ECG signal output from the output terminal.

[0095] Meanwhile, because the operational amplifier unit AMP is set between the second resistive unit 91 and the first acquisition pin LA`, the second voltage regulation protection unit 92 needs to clamp the voltage at the non-inverting input terminal within the upper limit of the withstand voltage of the operational amplifier unit AMP.

[0096] To reduce the overall power consumption of the wearable device, the second isolation module 90 further includes an operational amplifier switch control unit 93, which enables the operational amplifier unit AMP when performing electrocardiogram (ECG) detection and disables the operational amplifier unit AMP after completing ECG detection, thereby reducing the overall power consumption of the wearable device when ECG detection is not performed.

[0097] in, Figure 6 This is a schematic diagram of the circuit structure of the wearable device circuit control architecture provided in the embodiments of the present invention. Figure 6 .

[0098] Please refer to Figure 6 In one specific implementation, the second isolation module 90 further includes a third switching unit 94, the first and second terminals of which are respectively connected to the non-inverting input and output terminals of the operational amplifier unit AMP; the operational amplifier switch control unit 93 is used for:

[0099] When charging the internal power supply module 10 or when the system processing chip 20 communicates with the outside world, the third switch unit 94 is turned off and the operational amplifier unit AMP is disabled to completely isolate the influence of the internal power supply module 10 or the system processing chip 20 on the electrocardiogram detection chip 30.

[0100] When the internal power supply module 10 is not charging, the system processing chip 20 is not communicating externally, or the ECG detection chip 30 is not detecting the ECG, the third switch unit 94 is turned on and the operational amplifier unit AMP is turned off. This saves the power consumption of the operational amplifier unit AMP and establishes a direct connection between the second multi-function contact GND_RLD and the first acquisition pin LA`, so that the ECG detection chip 30 can quickly detect the input ECG signal, thereby improving the sensitivity of ECG detection.

[0101] When the ECG detection chip 30 detects the input of an ECG signal, the third switching unit 94 is turned off and the operational amplifier unit AMP is enabled.

[0102] In one specific embodiment, the first switching unit 40, the second switching unit 50, and the third switching unit 94 are all single-pole single-throw switches. Since electrocardiogram (ECG) signals are typically in the millivolt range, for example, only 1 millivolt or 2 millivolts, the turn-off leakage current of the first switching unit 40, the second switching unit 50, and the third switching unit 94 must all be less than or equal to a third threshold. The third threshold characterizes the maximum leakage current that will not affect the acquisition of the ECG signal during ECG detection. In this embodiment, the third threshold is set to 1 nA. Of course, the third threshold can also be set to the pA level or other values ​​depending on the accuracy requirements of the ECG signal acquisition; this is not limited here.

[0103] Of course, the turn-off leakage current of the first switching unit 40, the second switching unit 50 and the third switching unit 94 can also be set at the pA level.

[0104] in, Figure 7 This is a schematic diagram of the circuit structure of the wearable device circuit control architecture provided in the embodiments of the present invention. Figure 7 .

[0105] Please refer to Figure 7 In one specific implementation, if the withstand voltage of the operational amplifier unit AMP and the withstand voltage of the third switching unit 94 are both greater than the second threshold, for example, the second threshold is around 20V, then the second isolation module 90 can omit the second resistive unit 91 and the second voltage regulation protection unit 92, and only retain the operational amplifier unit AMP, the third switching unit 94 and the operational amplifier switch control unit 93.

[0106] As can be seen from the above, the specific device configuration inside the second isolation module 90 depends on the pin input impedance of the electrocardiogram detection chip 30, as well as the withstand voltage capability of the operational amplifier unit AMP and the third switching unit 94, and is not specifically limited here.

[0107] in, Figure 8 Circuit structure diagram of the wearable device circuit control architecture provided in this embodiment of the invention Figure 8 .

[0108] Please refer to Figure 8In one specific implementation, the first isolation module 80 includes an isolation NMOS transistor MN1 and a third resistive unit 81; the gate of the isolation NMOS transistor MN1 is connected to the input voltage VIO of the system processing chip 20, the source of the isolation NMOS transistor MN1 is coupled to the first terminal of the third resistive unit 81 and the communication pin COM of the system processing chip 20, and the drain of the isolation NMOS transistor MN1 is coupled to the second terminal of the first switching unit 40; the second terminal of the third resistive unit 81 is also connected to the input voltage VIO of the system processing chip 20.

[0109] When the second terminal of the first switching unit 40 is at a high voltage or a logic high level, the isolated NMOS transistor MN1 is turned off because its gate is connected to the input voltage VIO of the system processing chip 20 and its source is pulled up to the input voltage VIO of the system processing chip 20 by the third resistive unit 81. When the second terminal of the first switching unit 40 is at a logic low level, this low level is transmitted to the source of the isolated NMOS transistor MN1 through the body diode, so that the source of the isolated NMOS transistor MN1 is 0.7V. Since the input voltage VIO of the system processing chip 20 is usually 1.8V, the isolated NMOS transistor MN1 is turned on because its gate-source voltage is 1.1V, thus directly transmitting the logic low level of the drain of the isolated NMOS transistor MN1 to its own source. Therefore, the isolated NMOS transistor MN1 and the third resistive unit 81 realize the function of the first isolation module 80 to pass low voltage and block high voltage.

[0110] Of course, in addition to the isolation NMOS transistor MN1 and the third resistive unit 81, the first isolation module 80 can also be a conventional level shifting circuit, which will not be elaborated here.

[0111] In summary, the circuit control architecture of the wearable device provided by this embodiment of the invention constructs a power supply loop from the first multi-functional contact to the power supply terminal of the switch control module, to the internal ground terminal, and to the second multi-functional contact. The first isolation module blocks high voltage, allowing the first and second multi-functional contacts to function as both charging contacts for the internal power supply module and communication contacts for the system processing chip to communicate externally. Furthermore, because both the first and second switch units are turned off when the ECG signal detection chip detects ECG signals, the influence of the internal power supply module and the system processing chip on ECG signal detection is isolated. The second isolation module also blocks high voltage on the first multi-functional contact, enabling the first multi-functional contact to also be used for ECG signal detection. Furthermore, since the second multi-functional contact also serves as the output contact for ECG detection, and the ECG acquisition contact is normally used for ECG signal detection, only the first multi-functional contact, the second multi-functional contact, and the ECG acquisition contact are needed to control the charging of the internal power supply module, the external communication of the system processing chip, and the ECG detection of the ECG detection chip, thereby greatly saving the metal contacts required for wearable devices.

[0112] Furthermore, by setting the second diode unit and the third diode unit, it is ensured that when the first multi-function contact and the second multi-function contact are reverse-connected to charge the internal power supply module, a power-carrying circuit from the second multi-function contact to the first multi-function contact will not be formed, thereby ensuring that the electrocardiogram detection chip and the system processing chip will not be damaged by the reverse current.

[0113] Furthermore, by setting the first voltage regulation protection unit, the power supply voltage of the switch control module is clamped within a third voltage, which is between the operating voltage and the overvoltage threshold voltage. Therefore, when the second voltage between the first multi-function contact and the second multi-function contact is greater than the overvoltage threshold voltage, the switch control module will not be damaged, but will operate normally because the power supply voltage is clamped within the overvoltage threshold voltage.

[0114] Furthermore, by setting the second voltage regulation protection unit as a bidirectional voltage regulator, leakage current can be prevented from the output pin of the electrocardiogram detection chip to the first acquisition pin of the electrocardiogram detection chip.

[0115] Furthermore, the third switching unit is configured, and the operational amplifier switch control unit controls the third switching unit to conduct when the internal power supply module is not charging, the system processing chip is not communicating externally, or the ECG detection chip is not performing ECG detection, so as to establish a direct connection between the first multi-functional contact and the first acquisition pin of the ECG detection chip. Thus, when ECG detection is required, the ECG detection chip can quickly detect the input ECG signal and enable the operational amplifier unit and turn off the third switching unit.

[0116] Embodiments of the present invention also provide a wearable device, including the circuit control architecture of the wearable device.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A circuit control architecture for a wearable device, characterized in that, The circuit control architecture, used to control the charging of the internal power supply module, the external communication of the system processing chip, and the electrocardiogram detection of the electrocardiogram detection chip, includes: First multi-function contact, second multi-function contact, and ECG acquisition contact; A first switching unit and a second switching unit, wherein the first switching unit is coupled between the first multi-function contact and the input pin of the internal power supply module; and the second switching unit is coupled between the second multi-function contact and the internal ground terminal. A switch control module is respectively coupled to the first multi-function contact, the second multi-function contact, the control terminal of the first switch unit, and the control terminal of the second switch unit. The switch control module is used for: When the first voltage between its own power supply terminal and the internal ground terminal is greater than the operating voltage, the first switch unit and the second switch unit are both controlled to be turned on; and when the first voltage is less than the operating voltage, the first switch unit and the second switch unit are both controlled to be turned off. The second voltage between the first multi-function contact and the second multi-function contact is compared with the overvoltage threshold voltage, and the first switching unit and the second switching unit are turned off according to the comparison result, wherein the overvoltage threshold voltage is greater than the operating voltage; The power supply circuit module includes a first resistive unit and a first diode unit. The first end and the second end of the first resistive unit are respectively coupled to the first multi-function contact and the power supply terminal of the switch control module. The positive terminal of the first diode unit is connected to the internal ground terminal, and the negative terminal of the first diode unit is connected to the second multi-function contact. The system processing chip is used to output a third voltage to the power supply terminal of the switch control module through a first output pin when communicating with an external communication device. The third voltage is greater than the operating voltage and less than the overvoltage threshold voltage. A first isolation module is coupled between the second terminal of the first switching unit and the communication pin of the system processing chip. The first isolation module is used to turn off when the second terminal of the first switching unit is at a high level and to turn on when the second terminal of the first switching unit is at a low level. The second isolation module has its first and second ends connected to the first multi-functional contact and the first acquisition pin of the electrocardiogram detection chip, respectively; the second isolation module is used to protect the first acquisition pin from damage by high voltage. The second acquisition pin of the electrocardiogram (ECG) detection chip is connected to the ECG acquisition contact, and the output pin of the ECG detection chip is connected to the second multi-functional contact.

2. The circuit control architecture of the wearable device according to claim 1, characterized in that, The circuit control architecture of the wearable device further includes: a second diode unit and a third diode unit; the positive terminal of the second diode unit is connected to the first terminal of the first resistive unit, and the negative terminal of the second diode unit is connected to the power supply terminal of the switch control module; the negative terminal of the third diode is connected to the power supply terminal of the switch control module, and the positive terminal of the third diode is connected to the first output terminal of the system processing chip.

3. The circuit control architecture of the wearable device according to claim 2, characterized in that, The circuit control architecture of the wearable device further includes: a first voltage regulation and protection unit, which is coupled between the power supply terminal of the switch control module and the internal ground terminal. The first voltage regulation and protection unit is used to clamp the power supply terminal of the switch control module within a third voltage, which is between the operating voltage and the overvoltage threshold voltage.

4. The circuit control architecture of the wearable device according to any one of claims 1 to 3, characterized in that, The second isolation module includes a second resistive unit and a second voltage regulation and protection unit. The first end and the second end of the second resistive unit are respectively coupled to the first multi-functional contact and the first acquisition pin of the electrocardiogram detection chip. The first end of the second voltage regulation and protection unit is coupled to the second end of the second resistive unit, and the second end of the second voltage regulation and protection unit is coupled to the second multi-function contact. The second voltage regulation and protection unit is used to clamp the voltage at the second end of the second resistive unit within the first withstand voltage. The first withstand voltage is used to characterize the upper limit of the withstand voltage of the first acquisition pin of the electrocardiogram detection chip. The ratio between the first impedance and the second impedance is greater than a first threshold. The first impedance is used to characterize the input impedance of the first acquisition pin, and the second impedance is used to characterize the sum of the impedances of the first acquisition pin and the second resistive unit connected in series.

5. The circuit control architecture of the wearable device according to claim 4, characterized in that, The second isolation module includes a second resistive unit, a second voltage regulation and protection unit, an operational amplifier unit, and an operational amplifier switch control unit. The first and second terminals of the second resistive unit are respectively coupled to the first multi-function contact and the non-inverting input terminal of the operational amplifier unit. The first terminal of the second voltage regulation and protection unit is coupled to the second terminal of the second resistive unit, and the second terminal of the second voltage regulation and protection unit is coupled to the second multi-function contact. The second voltage regulation and protection unit is used to clamp the voltage at the second terminal of the second resistive unit within a second withstand voltage, which characterizes the upper limit of the withstand voltage of the non-inverting input terminal of the operational amplifier unit. The output terminal of the operational amplifier unit is respectively connected to its own inverting input terminal and the first acquisition pin of the electrocardiogram (ECG) detection chip. The operational amplifier switch control unit is used to enable the operational amplifier unit during ECG detection and to disable the operational amplifier unit after ECG detection is completed. Wherein, the ratio between the first impedance and the second impedance is less than the first threshold, and the ratio between the third impedance and the fourth impedance is greater than the first threshold. The third impedance is used to characterize the input impedance of the non-inverting input terminal, and the fourth impedance is used to characterize the sum of the impedances of the non-inverting input terminal and the second resistive unit connected in series.

6. The circuit control architecture of the wearable device according to claim 5, characterized in that, The second isolation module further includes a third switching unit, the first and second terminals of which are respectively connected to the non-inverting input and output terminals of the operational amplifier unit; the operational amplifier switch control unit is used for: When charging the internal power supply module or when the system processing chip is communicating with the outside world, the third switching unit is turned off and the operational amplifier unit is disabled. When the internal power supply module is not charging, the system processing chip is not communicating with the outside, or the ECG detection chip is not performing ECG detection, the third switching unit is turned on and the operational amplifier unit is turned off. When performing ECG detection using the ECG detection chip, the third switching unit is turned off and the operational amplifier unit is enabled.

7. The circuit control architecture of the wearable device according to claim 5, characterized in that, The second voltage regulation and protection unit includes a bidirectional voltage regulator.

8. The circuit control architecture of the wearable device according to claim 5, characterized in that, The second isolation module includes an operational amplifier unit, a third switching unit, and an operational amplifier switch control unit; the non-inverting input of the operational amplifier unit is coupled to the first multi-function contact, and the output of the operational amplifier unit is connected to its own inverting input and the first acquisition pin of the electrocardiogram detection chip; the first and second terminals of the third switching unit are respectively connected to the non-inverting input and output of the operational amplifier unit; the operational amplifier switch control unit is used for: When charging the internal power supply module or when the system processing chip is communicating with the outside world, the third switching unit is turned off and the operational amplifier unit is disabled. When the internal power supply module is not charging, the system processing chip is not communicating with the outside, or the ECG detection chip is not performing ECG detection, the third switching unit is turned on and the operational amplifier unit is turned off. When performing ECG detection using the ECG detection chip, the third switching unit is turned off and the operational amplifier unit is enabled. Wherein, the withstand voltage capability of the operational amplifier unit and the withstand voltage capability of the third switching unit are both greater than the second threshold, the second threshold is greater than the charging voltage, and the charging voltage is used to characterize the voltage on the first multi-functional contact when the internal power supply module is charged.

9. The circuit control architecture of the wearable device according to claim 8, characterized in that, The shutdown leakage current of the first switching unit, the second switching unit, and the third switching unit is less than or equal to the third threshold.

10. The circuit control architecture of the wearable device according to claim 1, characterized in that, The first isolation module includes an isolation NMOS transistor and a third resistive unit; the gate of the isolation NMOS transistor is connected to the input voltage of the system processing chip, the source of the isolation NMOS transistor is coupled to the first terminal of the third resistive unit and the communication pin of the system processing chip, and the drain of the isolation NMOS transistor is coupled to the second terminal of the first switching unit; the second terminal of the third resistive unit is also connected to the input voltage of the system processing chip.

11. A wearable device, characterized in that, The circuit control architecture of the wearable device as described in any one of claims 1 to 10 is included.

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