Circuit control architecture of wearable device and wearable device

Abstract

The invention provides a circuit control framework of wearable equipment and the wearable equipment. The framework comprises a first multifunctional contact, a second multifunctional contact and an electrocardiogram acquisition contact, the first multifunctional contact is connected with the internal power supply module through the first switch unit, is connected with the system processing chip through the first switch unit and the first isolation module, and is connected with the electrocardiogram detection chip through the second isolation module; the second multifunctional contact is connected with the internal ground end through the second switch unit and is directly connected with the electrocardiogram detection chip, and the electrocardiogram acquisition contact is directly connected with the electrocardiogram detection chip; the switch control module is used for controlling the on-off of the first switch unit and the second switch unit according to the voltage of the power supply end of the switch control module; the power supply loop module is used for constructing a power supply loop from the first multifunctional contact to the power supply end to the internal ground end to the second multifunctional contact; according to the invention, charging, communication and electrocardiogram detection functions of the equipment can be realized only by three metal contacts, so that the metal contacts required by the wearable equipment are saved.

Description

Technical Field

[0001] The present invention relates to the field of electronic circuits, and in particular to a circuit control architecture of a wearable device and the wearable device. Background Art

[0002] At present, more and more wearable devices such as smart rings, smart watches, and smart bracelets are considering adding human electrocardiogram detection functions. To achieve electrocardiogram detection, it is necessary to set at least two acquisition contacts and one output contact on the outer shell of the wearable device as contact electrodes for detecting human electrocardiogram signals. Because wearable devices must have both charging and communication functions, it is also necessary to set at least two communication contacts, one power contact, and one ground contact on the outer shell of the wearable device.

[0003] Therefore, the wearable device of the prior art needs to have at least 7 metal contacts in order to have the functions of electrocardiogram detection, charging and communication. However, the 7 metal contacts not only affect the appearance of the wearable device, but also increase the cost of the device and even increase the influence of the external environment on the internal circuit.

[0004] Therefore, how to enable wearable devices to combine electrocardiogram detection, charging and communication functions with fewer metal contacts has become a technical problem that the industry urgently needs to solve. Summary of the invention

[0005] The embodiments of the present invention provide a circuit control architecture of a wearable device and a wearable device to solve the problems existing in the existing wearable devices.

[0006] In order to solve the above technical problems, the technical solution of the present invention provides a circuit control architecture of a wearable device, which is used to control the charging of an internal power supply module, the external communication of a system processing chip, and the electrocardiogram detection of an electrocardiogram detection chip. The circuit control architecture includes:

[0007] A first multifunctional contact, a second multifunctional contact and an ECG collection contact;

[0008] A first switch unit and a second switch unit, wherein the first end and the second end of the first switch unit are respectively coupled to the first multifunctional contact and the input pin of the internal power supply module; the first end and the second end of the second switch unit are respectively coupled to the second multifunctional contact and the internal ground terminal;

[0009] A switch control module, the switch control module is respectively coupled to the first multifunctional contact, the second multifunctional contact, the control end of the first switch unit and the control end of the second switch unit, and the switch control module is used for:

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

[0011] comparing a second voltage between the first multifunctional contact and the second multifunctional contact with an overvoltage threshold voltage, and controlling the first switch unit and the second switch unit to be turned off according to the comparison result, wherein the overvoltage threshold voltage is greater than the operating voltage;

[0012] A power supply circuit module, comprising a first resistance unit and a first diode unit, wherein a first end and a second end of the first resistance unit are respectively coupled to the first multi-function contact and a power supply end of the switch control module, an anode of the first diode unit is connected to the internal ground end, and a cathode 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 end of the switch control module through the first output pin when the external communication device communicates with the system processing chip, and the third voltage is greater than the working voltage and less than the overvoltage threshold voltage;

[0014] a first isolation module, the first isolation module being coupled between the second end of the first switch unit and the communication pin of the system processing chip, the first isolation module being used to turn off when the second end of the first switch unit is at a high level, and being used to turn on when the second end of the first switch unit is at a low level;

[0015] a second isolation module, wherein a first end and a second end of the second isolation module are respectively connected to the first multifunctional contact and the first acquisition pin of the electrocardiogram detection chip; the second isolation module is used to protect the first acquisition pin from being damaged by high voltage;

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

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

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

[0019] Optionally, the second isolation module includes a second resistance unit and a second voltage stabilizing protection unit, the first end and the second end of the second resistance 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 stabilizing protection unit is coupled to the second end of the second resistance unit, the second end of the second voltage stabilizing protection unit is coupled to the second multi-functional contact, the second voltage stabilizing protection unit is used to clamp the voltage at the second end of the second resistance unit within a first withstand voltage, and the first withstand voltage is used to characterize the withstand voltage upper limit of the first acquisition pin of the electrocardiogram detection chip;

[0020] The ratio of the first impedance to 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 stabilizing protection unit, an operational amplifier unit and an operational amplifier switch control unit; the first end and the second end of the second resistive unit are respectively coupled to the first multifunctional contact and the in-phase input end of the operational amplifier unit; the first end of the second voltage stabilizing protection unit is coupled to the second end of the second resistive unit, and the second end of the second voltage stabilizing protection unit is coupled to the second multifunctional contact, and the second voltage stabilizing protection unit is used to clamp the voltage at the second end of the second resistive unit within a second withstand voltage, and the second withstand voltage is used to characterize the withstand voltage upper limit of the in-phase input end of the operational amplifier unit; the output end of the operational amplifier unit is respectively connected to its own inverting input end and the first acquisition pin of the electrocardiogram detection chip; the operational amplifier switch control unit is used to enable the operational amplifier unit when performing electrocardiogram detection, and is used to disable the operational amplifier unit after completing the electrocardiogram detection;

[0022] Among them, the ratio between the first impedance and the second impedance is less than a 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 in-phase input terminal, and the fourth impedance is used to characterize the sum of the impedances of the in-phase input terminal and the second resistive unit in series.

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

[0024] When charging the internal power supply module or the system processing chip is communicating with the outside, turning off the third switch unit and disabling the operational amplifier unit;

[0025] When the internal power supply module is not being charged, the system processing chip is not communicating externally, or the electrocardiogram detection chip is not detecting an electrocardiogram, the third switch unit is turned on and the operational amplifier unit is disabled;

[0026] When performing electrocardiogram detection on the electrocardiogram detection chip, the third switch unit is turned off and the operational amplifier unit is enabled.

[0027] Optionally, the second voltage stabilization protection unit includes a bidirectional voltage regulator tube.

[0028] Optionally, the second isolation module includes an operational amplifier unit, a third switch unit and an operational amplifier switch control unit; the in-phase input terminal of the operational amplifier unit is coupled to the first multi-functional contact, and 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 detection chip; the first terminal and the second terminal of the third switch unit are respectively connected to the in-phase input terminal and the output terminal of the operational amplifier unit; the operational amplifier switch control unit is used to:

[0029] When charging the internal power supply module or the system processing chip is communicating with the outside, turning off the third switch unit and disabling the operational amplifier unit;

[0030] When the internal power supply module is not being charged, the system processing chip is not communicating externally, or the electrocardiogram detection chip is not detecting an electrocardiogram, the third switch unit is turned on and the operational amplifier unit is disabled;

[0031] When performing electrocardiogram detection on the electrocardiogram detection chip, turning off the third switch unit and enabling the operational amplifier unit;

[0032] Among them, the voltage resistance of the operational amplifier unit and the voltage resistance of the third switch unit are both greater than a second threshold, the second threshold is greater than a charging voltage, and the charging voltage is used to characterize the voltage on the first multi-function contact when the internal power supply module is charged.

[0033] Optionally, the turn-off leakage current of the first switch unit, the second switch unit and the third switch unit is less than or equal to a third threshold.

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

[0035] The technical solution of the present invention also provides a wearable device, including a 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 the technical solution of the present invention connects the first multifunctional contact and the power supply end of the switch control module through the first resistive unit, and connects the internal ground end of the wearable device and the second multifunctional contact through the first diode unit to construct a power supply circuit from the first multifunctional contact to the power supply end of the switch control module to the internal ground end to the second multifunctional contact. When the first voltage between the power supply end of the switch control module and the internal ground end is greater than the working voltage, it means that the internal power supply module needs to be charged or the system processing chip needs to communicate. At this time, the switch control module controls the first switch unit and the second switch unit to be turned on. In addition, because the first isolation module is used to cut off the connection between the second end of the first switch unit and the communication pin of the system processing chip when the second end 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 due to the high voltage during charging. Therefore, the first multifunctional 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, so that the first multifunctional contact can realize the multiplexing of charging contacts and communication contacts. When the first voltage is less than the working voltage, the switch control module controls the first switch unit and the second switch unit to be turned off, thereby preventing the internal power supply module and the system processing chip from affecting the detection of the electrocardiogram signal. Because the second isolation module can protect the first acquisition pin from being damaged by high voltage, the high voltage on the first multi-function contact is prevented from damaging the electrocardiogram detection chip. Therefore, the first multi-function contact can also be connected to the first acquisition pin of the electrocardiogram detection chip through the second isolation module, thereby realizing the reuse of the first multi-function contact as an electrocardiogram acquisition contact.

[0038] Because the output pin of the electrocardiogram detection chip is not easily affected by external noise, the second multifunctional contact can be connected to the internal ground terminal and the output pin of the electrocardiogram detection chip at the same time, so as to realize the multiplexing of the second multifunctional contact as the electrocardiogram detection output contact and the ground terminal contact. And because the electrocardiogram acquisition contact is connected to the second acquisition pin of the electrocardiogram detection chip, the circuit control architecture of the present invention only needs the first multifunctional contact, the second multifunctional contact and the electrocardiogram acquisition contact 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, thereby greatly saving the metal contacts required for the wearable device.

[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 reversely connected during charging of the internal power supply module, a power-on circuit from the second multi-function contact to the first multi-function contact is not formed, thereby ensuring that the electrocardiogram detection chip, the switch control module and the system processing chip are not damaged by the reverse current.

[0040] Furthermore, by setting the first voltage stabilizing protection unit, the voltage at the power supply terminal of the switch control module is clamped within a third voltage, and the third voltage is between the working voltage and the overvoltage threshold voltage. Therefore, when the second voltage between the first multifunctional contact and the second multifunctional contact is greater than the overvoltage threshold voltage, the switch control module will work normally because the voltage at the power supply terminal is clamped within the overvoltage threshold voltage.

[0041] Furthermore, the second voltage stabilizing protection unit is set as a bidirectional voltage stabilizing tube to prevent the output pin of the electrocardiogram detection chip from leaking electricity to the first acquisition pin of the electrocardiogram detection chip.

[0042] Furthermore, the third switch unit is provided, and the third switch unit is controlled by the operational amplifier switch control unit to be turned on when the internal power supply module is not charged, the system processing chip is not communicating externally, or the electrocardiogram detection chip is not detecting the electrocardiogram, so as to establish a direct connection from the first multi-function contact to the first acquisition pin of the electrocardiogram detection chip, so that when the electrocardiogram detection chip needs to detect the electrocardiogram, the electrocardiogram detection chip can quickly detect the input of the electrocardiogram signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 The circuit structure diagram of the circuit control architecture of the wearable device provided by the embodiment of the present invention is Figure 1 ;

[0044] Figure 2The circuit structure diagram of the circuit control architecture of the wearable device provided by the embodiment of the present invention is Figure 1 ;

[0045] Figure 3 The circuit structure diagram of the circuit control architecture of the wearable device provided by the embodiment of the present invention is Figure 2 ;

[0046] Figure 4 The circuit structure diagram of the circuit control architecture of the wearable device provided by the embodiment of the present invention is Figure 4 ;

[0047] Figure 5 The circuit structure diagram of the circuit control architecture of the wearable device provided by the embodiment of the present invention is Figure 5 ;

[0048] Figure 6 The circuit structure diagram of the circuit control architecture of the wearable device provided by the embodiment of the present invention is Figure 6 ;

[0049] Figure 7 The circuit structure diagram of the circuit control architecture of the wearable device provided by the embodiment of the present invention is Figure 7 ;

[0050] Figure 8 The circuit structure diagram of the circuit control architecture of the wearable device provided by the embodiment of the present invention is Figure 8 . DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0052] At present, more and more wearable devices such as smart rings, smart watches, smart bracelets, etc. will consider adding human electrocardiogram detection functions. To realize the electrocardiogram detection function, it is necessary to add metal contacts connected to the internal circuit on the outer shell of the wearable device to serve as contact electrodes for detecting human electrocardiogram signals. The wearable device generally needs to set a first acquisition electrode, a second acquisition electrode and a right leg drive electrode for electrocardiogram detection. The first acquisition electrode and the second acquisition electrode are both used to collect weak electrocardiogram signals of the human body and transmit them to the electrocardiogram detection chip set inside the device. The right leg drive electrode is used to output the common-mode interference suppression signal of the electrocardiogram detection chip to the human body to suppress the interference caused by the common-mode signal noise to the electrocardiogram signals collected by the two acquisition contacts. Therefore, at least three metal contacts need to be set to realize the electrocardiogram detection function of the wearable device. Since the internal circuit of the electrocardiogram detection chip is a conventional technical means in this field, it will not be repeated here.

[0053] In addition to the electrocardiogram detection function, wearable devices must also have charging and external communication functions. To realize the charging function, it is generally necessary to set up a charging electrode and a ground electrode. The charging electrode is externally connected to the output end of the external power supply device and internally connected to the input end of the power supply module inside the device; the ground contact is externally connected to the ground end of the external power supply device and internally connected to the ground end inside the device to form a charging circuit between the external power supply device and the device power supply module. Therefore, at least two metal contacts are required to realize the charging function of the wearable device. To realize the external communication function, it is generally necessary to set up two communication electrodes and a ground electrode. Since the ground electrode can be shared, at least two metal contacts are required to realize the external communication function of the wearable device.

[0054] From the above, we can see that if a wearable device is to have the functions of electrocardiogram detection, charging and external communication, at least 7 metal contacts are required. However, there are the following problems with setting 7 metal contacts:

[0055] 1. In order to ensure that the metal contacts maintain good electrical properties and improve the anti-oxidation ability of the contacts, the metal contacts are generally gold-plated, and each metal contact occupies the area of ​​the appearance structure. Therefore, setting up 7 metal contacts will not only greatly increase the cost of the wearable device, but also affect the appearance of the wearable device.

[0056] 2. The first collection contact and the right leg drive contact of the existing wearable device are generally set on the bottom surface of the inner circle of the device in contact with human skin for electrocardiogram detection. The charging contacts and communication contacts of the existing wearable device are generally also set on the bottom surface of the inner circle of the device and in contact with human skin. Therefore, the electrical noise on the charging contact or communication contact will be transmitted to the first collection contact and the right leg drive contact through the human skin. Because the amplitude of the electrocardiogram signal is very weak, generally only one or two millivolts, the electrical noise will seriously affect the detection accuracy of the electrocardiogram signal.

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

[0058] in, Figure 1 The circuit structure diagram of the circuit control architecture of the wearable device provided by the embodiment of the present invention is Figure 1 .

[0059] Please refer to Figure 1 , the circuit control architecture of the wearable device provided by the embodiment of the present invention includes:

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

[0061] A first switch unit 40 and a second switch unit 50, wherein a first end and a second end of the first switch unit 40 are respectively coupled to the first multi-function contact VBUS_COM_LA and an input pin of the internal power supply module 10; a first end and a second end of the second switch unit 50 are respectively coupled to the second multi-function contact GND_RLD and an internal ground terminal GND;

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

[0063] When the first voltage between the power supply terminal VCCEN and the internal ground terminal GND is greater than the working voltage, the first switch unit 40 and the second switch unit 50 are controlled to be turned on; and when the first voltage is less than the working voltage, the first switch unit 40 and the second switch unit 50 are controlled to be turned off;

[0064] Comparing a second voltage between the first multi-function contact VBUS_COM_LA and the second multi-function contact GND_RLD with an overvoltage threshold voltage, and controlling the first switch unit 40 and the second switch unit 50 to be turned off according to the comparison result, wherein the overvoltage threshold voltage is greater than the operating voltage;

[0065] A power supply loop module, comprising a first resistance unit 71 and a first diode unit 72, wherein a first end and a second end of the first resistance unit 71 are respectively coupled to the first multi-function contact VBUS_COM_LA and the power supply end VCCEN of the switch control module, an anode of the first diode unit 72 is connected to the internal ground GND, and a cathode 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 the external communication device communicates with the system processing chip 20, and the third voltage is greater than the working voltage;

[0067] a first isolation module 80, the first isolation module 80 being coupled between the second end of the first switch unit 40 and the communication pin COM of the system processing chip 20, the first isolation module 80 being used to turn off when the second end of the first switch unit 40 is at a high level, and being used to turn on when the second end of the first switch unit 40 is at a low level;

[0068] A second isolation module 90, wherein a first end and a second end of the second isolation module 90 are 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-function contact GND_RLD.

[0070] Through the above technical means, the embodiment of the present invention can realize the electrocardiogram detection, charging and external communication of the wearable device through only three metal contacts. The specific principle is as follows:

[0071] In the embodiment of the present invention, the first multi-function contact VBUS_COM_LA and the power supply terminal VCCEN of the switch control module are connected through the 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 the first diode unit 72, so as 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 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 the 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 the ground terminal of the external charging device respectively, so that the voltage between the power supply terminal VCCEN of the switch control module and the internal ground terminal GND is greater than the working voltage of the switch control module 60, so that the switch control module 60 controls the first switch unit 40 and the second switch unit 50 to be turned on, thereby realizing the charging of the internal power supply module 10. While charging the internal power supply module 10, the first isolation module 80 cuts off the connection between the second end of the first switch unit 40 and the communication pin of the system processing chip 20 because the second end 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 an MCU of an external device, needs to communicate with the system processing chip 20 in 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' and the ground of the external communication device respectively. Because the communication signal output by the external communication device is a digital signal switched 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, so the system processing chip 20 outputs a third voltage to the power supply terminal VCCEN of the switch control module. Since the third voltage is greater than the working voltage of the switch control module 60, the switch control module 60 controls 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 itself, the first isolation module 80 will be turned on when the communication signal output by the external communication device is at a low level to transmit logic zero, and will be turned off when the communication signal output by the external communication device is at a high level 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-line communication between the external communication device and the system processing chip 20 is realized, so that the first multi-function contact VBUS_COM_LA is multiplexed as a communication contact.

[0074] When performing electrocardiogram detection, since the voltage difference between the first multi-function contact VBUS_COM_LA and the second multi-function contact GND_RLD cannot provide the operating voltage of the switch control module 60, the first switch unit 40 and the second switch unit 50 are both turned off to completely cut off the connection between the internal power supply module 10 and the system processing chip 20 and the first multi-function contact VBUS_COM_LA, thereby avoiding the internal power supply module 10 and the system processing chip 20 from affecting the detection of the electrocardiogram signal. In addition, because the first multi-function contact VBUS_COM_LA can be indirectly connected to the first acquisition pin LA` of the electrocardiogram detection chip 30 through the second isolation module 90, the first multi-function contact VBUS_COM_LA can be connected to the first acquisition pin LA` of the electrocardiogram detection chip 30, thereby making the first multi-function contact VBUS _ COM _ LA is multiplexed as the first acquisition contact. Because the output pin RLD' of the electrocardiogram detection chip 30 has the characteristics of low output impedance and strong driving ability and is not easily affected by external noise, the second multi-function contact GND_RLD can be directly connected to the output pin RLD' of the electrocardiogram detection chip 30, so that the second multi-function contact GND_RLD is multiplexed as the right leg driving contact. Finally, the electrocardiogram acquisition contact RA is connected to the second acquisition pin RA' of the electrocardiogram detection chip 30, so that the electrocardiogram acquisition contact RA can normally serve as the second acquisition contact for electrocardiogram detection.

[0075] From the above description, it can be seen that the circuit control architecture of the wearable device provided in the embodiment of the present invention greatly reduces the influence of the internal power supply module 10 and the system processing chip 20 on the electrocardiogram signal detection, and ensures that the communication pin of the system processing chip 20 and the first acquisition pin LA` of the electrocardiogram detection chip 30 are not damaged by high voltage, so that only the first multi-function contact VBUS_COM_LA, the second multi-function contact GND_RLD and the electrocardiogram acquisition contact RA are required to control the charging of the internal power supply module 10, the external communication of the system processing chip 20 and the electrocardiogram detection of the electrocardiogram detection chip 30, that is, the electrocardiogram detection, charging and external communication of the wearable device are realized through only three metal contacts, which greatly saves the metal contacts required for the wearable device compared with the prior art.

[0076] In order to make the above-mentioned objects, features and beneficial effects of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0077] As a specific implementation, although the normal charging voltage is usually 5V, the user may use other high-voltage chargers to charge the wearable device, which may cause the connected voltage to exceed 5V. Therefore, the withstand voltage of the first switch unit 40, the second switch unit 50 and the switch control module 60 needs to be set above 12V, and preferably support a high voltage of 20V. At the same time, the on-resistance of each of the first switch unit 40 and the second switch unit 50 needs to be set within 100 milliohms to facilitate the power channel switch during charging. In addition, the bandwidth of each of the first switch unit 40 and the second switch unit 50 needs to be set above 100MHz to facilitate the digital channel during communication.

[0078] in, Figure 2 The circuit structure diagram of the circuit control architecture of the wearable device provided by the embodiment of the present invention is Figure 2 .

[0079] Please refer to Figure 2 As a 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 end of the first resistive unit 71, and the cathode of the second diode unit 100 is connected to the power supply end VCCEN of the switch control module; the cathode of the third diode unit 110 is connected to the power supply end 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. The second diode unit 100 and the third diode unit 110 are both diodes.

[0080] By providing the second diode unit 100 and the third diode unit 110, it is possible to ensure that the external power supply device is connected to the first multi-function contact VBUS. _ COM _ LA and the second multifunctional contact GND _ When RLD is reversely connected, the circuit control structure will not be damaged by the negative input voltage.

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

[0082] Secondly, the high voltage on the second multi-function contact GND_RLD will be blocked by the second diode unit 100 when passing through the output pin RLD` of the electrocardiogram detection chip 30, the internal ground terminal GND, and the power supply terminal VCCEN of the switch control module, and cannot form a current loop from the second multi-function contact GND_RLD to the first multi-function contact VBUS_COM_LA, thereby preventing the electrocardiogram detection chip 30 and the switch control module 60 from being damaged by negative pressure.

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

[0084] in, Figure 3 The circuit structure diagram of the circuit control architecture of the wearable device provided by the embodiment of the present invention is Figure 3 .

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

[0086] By setting the first voltage stabilizing protection unit 120, the first multi-function contact VBUS _ COM_ LA and the second multifunctional contact GND _ When the voltage difference between the first and second multi-function contacts VBUS_COM_LA and GND_RLD is greater than the overvoltage threshold voltage, the power supply terminal VCCEN of the switch control module is clamped within the third voltage to ensure that the switch control module 60 can work normally 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 working voltage of the switch control module 60, which is generally about 6V. Figure 4 The circuit structure diagram of the circuit control architecture of the wearable device provided by the embodiment of the present invention is Figure 4 .

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

[0088] The ratio of the first impedance to 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] The second voltage stabilizing protection unit 92 is specifically a bidirectional voltage regulator tube, a first positive end of the bidirectional voltage regulator tube is connected to the second end of the second resistive unit 91, and a second positive end of the bidirectional voltage regulator tube is connected to the second multifunctional contact GND _ In addition to ensuring that the first acquisition pin LA' will not be damaged by charging high voltage or sudden high voltage input through the bidirectional voltage regulator, the bidirectional voltage regulator can also prevent the output pin RLD' of the electrocardiogram detection chip 30 from leaking to the first acquisition pin LA'.

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

[0091] However, when the electrocardiogram detection chip 30 performs electrocardiogram detection, in order to avoid the second resistive unit 91 dividing a large voltage and affecting the electrocardiogram detection, it is necessary to select an electrocardiogram detection chip 30 with a large pin input impedance so that the voltage divided by the second resistive unit 91 can be ignored. For example, if the impedance of the second resistive unit 91 is set between 10MQ and 100MΩ, the input impedance of the first acquisition pin LA` must be at least 1GQ, or even above 10GΩ. Therefore, the first threshold value specifically represents the minimum proportion of the input impedance of the first acquisition pin LA` without affecting the electrocardiogram detection. Since the specific size of the first threshold value will vary with the actual environment and detection requirements, it is not limited here.

[0092] in, Figure 5 The circuit structure diagram of the circuit control architecture of the wearable device provided by the embodiment of the present invention is Figure 5 .

[0093] Please refer to Figure 5 As a specific implementation, in the case where the electrocardiogram detection chip 30 with a smaller pin input impedance is selected and affects the electrocardiogram detection, for example, the impedance of the second resistive unit 91 is between 10MQ and 100MΩ, and the input impedance of the first acquisition pin LA' is less than 1GΩ. In this case, it is necessary to set an operational amplifier unit AMP with a large input impedance between the second resistive unit 91 and the first acquisition pin LA' so that the electrocardiogram detection is not affected by the second resistive unit 91. For example, the input impedance of the operational amplifier unit AMP reaches 1GΩ, or even more than 10GΩ.

[0094] Because the in-phase input terminal of the operational amplifier unit AMP is connected to the second terminal of the second resistive unit 91, and the output terminal of the operational amplifier unit AMP is respectively connected to the first acquisition pin LA' and its own inverting input terminal. The connection mode of the operational amplifier unit AMP enables the operational amplifier unit AMP to enter the voltage following mode, that is, the electrocardiogram signal input to the in-phase input terminal is equal to the electrocardiogram signal output from the output terminal, thereby greatly improving the driving ability and anti-interference ability of the electrocardiogram signal output from the output terminal.

[0095] At the same time, because the operational amplifier unit AMP is provided between the second resistive unit 91 and the first acquisition pin LA', the second voltage stabilization protection unit 92 needs to clamp the voltage at the in-phase input terminal within the upper voltage limit of the operational amplifier unit AMP.

[0096] In order to reduce the overall power consumption of the wearable device, the second isolation module 90 also includes an operational amplifier switch control unit 93, which is used to enable the operational amplifier unit AMP when performing electrocardiogram detection; and disable the operational amplifier unit AMP after completing the electrocardiogram detection, thereby reducing the overall power consumption of the wearable device during the period when no electrocardiogram detection is performed.

[0097] in, Figure 6 The circuit structure diagram of the circuit control architecture of the wearable device provided by the embodiment of the present invention is Figure 6 .

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

[0099] When the internal power supply module 10 is charged or the system processing chip 20 is communicating with the outside, 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 being charged, the system processing chip 20 is not communicating externally, or the electrocardiogram detection chip 30 is not performing electrocardiogram detection, the third switch unit 94 is turned on and the operational amplifier unit AMP is disabled, thereby saving the power consumption of the operational amplifier unit AMP and establishing a direct connection channel between the second multi-function contact GND_RLD and the first acquisition pin LA`, so that the electrocardiogram detection chip 30 can quickly detect the input of the electrocardiogram signal, thereby improving the sensitivity of the electrocardiogram detection.

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

[0102] As a specific embodiment, the first switch unit 40, the second switch unit 50 and the third switch unit 94 are all single-pole single-throw switches. Since the electrocardiogram signal is usually at the millivolt level, for example, only 1 millivolt or 2 millivolts, the turn-off leakage current of the first switch unit 40, the second switch unit 50 and the third switch unit 94 needs to be less than or equal to the third threshold. The third threshold is used to characterize the maximum leakage current that will not affect the acquisition of the electrocardiogram signal during electrocardiogram detection. In this embodiment, the third threshold is set to 1nA. Of course, the third threshold can also be set to pA level or other according to the accuracy requirements of the electrocardiogram signal acquisition, which is not limited here.

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

[0104] in, Figure 7 The circuit structure diagram of the circuit control architecture of the wearable device provided by the embodiment of the present invention is Figure 7 .

[0105] Please refer to Figure 7 As a specific implementation, if the voltage resistance of the operational amplifier unit AMP and the voltage resistance of the third switch 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 stabilizing protection unit 92, and only retain the operational amplifier unit AMP, the third switch unit 94 and the operational amplifier switch control unit 93.

[0106] As can be seen from the above, the device configuration inside the second isolation module 90 depends specifically on the pin input impedance of the electrocardiogram detection chip 30, and the respective voltage resistance capabilities of the operational amplifier unit AMP and the third switch unit 94, which are not specifically limited here.

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

[0108] Please refer to Figure 8As a specific implementation, the first isolation module 80 includes an isolation NMOS tube MN1 and a third resistance unit 81; the gate of the isolation NMOS tube MN1 is connected to the input voltage VIO of the system processing chip 20, the source of the isolation NMOS tube MN1 is respectively coupled to the first end of the third resistance unit 81 and the communication pin COM of the system processing chip 20, and the drain of the isolation NMOS tube MN1 is coupled to the second end of the first switch unit 40; the second end of the third resistance unit 81 is also connected to the input voltage VIO of the system processing chip 20.

[0109] When the second end of the first switch unit 40 is at a high voltage or a logic high level, the isolated NMOS transistor MN1 is turned off because the gate is connected to the input voltage VIO of the system processing chip 20 and the source is pulled up to the input voltage VIO of the system processing chip 20 by the third resistance unit 81. When the second end of the first switch unit 40 is at a logic low level, the low level is transmitted to the source of the isolated NMOS transistor MN1 through the body diode of the isolated NMOS transistor MN1, so that the source of the isolated NMOS transistor MN1 is 0.7V. Because the input voltage VIO of the system processing chip 20 is usually 1.8V, the isolated NMOS transistor MN1 is turned on because the gate-source voltage is 1.1V, and then the logic low level of the drain of the isolated NMOS transistor MN1 is directly transmitted to its own source. Therefore, the function of the first isolation module 80 passing low voltage and blocking high voltage is realized through the isolated NMOS transistor MN1 and the third resistance unit 81.

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

[0111] In summary, the circuit control architecture of the wearable device provided by the embodiment of the present invention constructs a power supply circuit from the first multi-function contact to the power supply end of the switch control module to the internal ground end to the second multi-function contact, and blocks the high voltage through the first isolation module, so that the first multi-function contact and the second multi-function contact have both charging contacts for charging the internal power supply module and communication contacts for external communication of the system processing chip. In addition, because the first switch unit and the second switch unit are both turned off when the electrocardiogram signal detection chip is detecting the electrocardiogram signal, the influence of the internal power supply module and the system processing chip on the electrocardiogram signal detection is blocked, and the high voltage on the first multi-function contact is blocked by the second isolation module, so that the first multi-function contact can also be used for the detection of electrocardiogram signals. And because the second multi-function contact also serves as an output contact for electrocardiogram detection, and the electrocardiogram acquisition contact is normally used for detecting electrocardiogram signals, only the first multi-function contact, the second multi-function contact and the electrocardiogram acquisition contact are needed 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, thereby greatly saving the metal contacts required for the wearable device.

[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 reversely connected during charging of the internal power supply module, a power-on 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 providing the first voltage stabilizing protection unit, the voltage at the power supply terminal of the switch control module is clamped within a third voltage, and the third voltage is between the working voltage and the overvoltage threshold voltage. Therefore, when the second voltage between the first multifunctional contact and the second multifunctional contact is greater than the overvoltage threshold voltage, the switch control module will not be damaged, but will work normally because the voltage at the power supply terminal is clamped within the overvoltage threshold voltage.

[0114] Furthermore, the second voltage stabilizing protection unit is set as a bidirectional voltage stabilizing tube to prevent the output pin of the electrocardiogram detection chip from leaking electricity to the first acquisition pin of the electrocardiogram detection chip.

[0115] Furthermore, the third switch unit is set and controlled by the operational amplifier switch control unit to be turned on when the internal power supply module is not charged or the system processing chip is not communicating externally or the electrocardiogram detection chip is not detecting the electrocardiogram, so as to establish a direct connection from the first multi-function contact to the first acquisition pin of the electrocardiogram detection chip, so that when the electrocardiogram detection chip needs to perform electrocardiogram detection, the electrocardiogram detection chip can quickly detect the input of the electrocardiogram signal, enable the operational amplifier unit and turn off the third switch unit.

[0116] An embodiment of the present invention further provides a wearable device, including a 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned 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 is 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. The circuit control architecture includes: A first multifunctional contact, a second multifunctional contact and an ECG collection contact; A first switch unit and a second switch unit, wherein the first end and the second end of the first switch unit are respectively coupled to the first multifunctional contact and the input pin of the internal power supply module; the first end and the second end of the second switch unit are respectively coupled to the second multifunctional contact and the internal ground terminal; A switch control module, the switch control module is respectively coupled to the first multifunctional contact, the second multifunctional contact, the control end of the first switch unit and the control end of the second switch unit, and the switch control module is used for: When the first voltage between the power supply terminal and the internal ground terminal is greater than the working voltage, the first switch unit and the second switch unit are controlled to be turned on; and when the first voltage is less than the working voltage, the first switch unit and the second switch unit are controlled to be turned off; comparing a second voltage between the first multifunctional contact and the second multifunctional contact with an overvoltage threshold voltage, and controlling the first switch unit and the second switch unit to be turned off according to the comparison result, wherein the overvoltage threshold voltage is greater than the operating voltage; A power supply circuit module, comprising a first resistance unit and a first diode unit, wherein a first end and a second end of the first resistance unit are respectively coupled to the first multi-function contact and a power supply end of the switch control module, an anode of the first diode unit is connected to the internal ground end, and a cathode 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 end of the switch control module through the first output pin when the external communication device communicates with the system processing chip, and the third voltage is greater than the working voltage and less than the overvoltage threshold voltage; a first isolation module, the first isolation module being coupled between the second end of the first switch unit and the communication pin of the system processing chip, the first isolation module being used to turn off when the second end of the first switch unit is at a high level, and being used to turn on when the second end of the first switch unit is at a low level; a second isolation module, wherein a first end and a second end of the second isolation module are respectively connected to the first multifunctional contact and the first acquisition pin of the electrocardiogram detection chip; the second isolation module is used to protect the first acquisition pin from being damaged by high voltage; The second acquisition pin of the electrocardiogram detection chip is connected to the electrocardiogram acquisition contact, and the output pin of the electrocardiogram 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 also includes: a second diode unit and a third diode unit; the anode of the second diode unit is connected to the first end of the first resistive unit, and the cathode of the second diode unit is connected to the power supply end of the switch control module; the cathode of the third diode is connected to the power supply end of the switch control module, and the anode of the third diode is connected to the first output end 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 also includes: a first voltage stabilization protection unit, which is coupled between the power supply end of the switch control module and the internal ground end, and the first voltage stabilization protection unit is used to clamp the power supply end of the switch control module within a third voltage, and the third voltage 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 resistance unit and a second voltage stabilization protection unit, wherein a first end and a second end of the second resistance unit are respectively coupled to the first multi-functional contact and a first acquisition pin of the electrocardiogram detection chip; The first end of the second voltage stabilizing protection unit is coupled to the second end of the second resistance unit, the second end of the second voltage stabilizing protection unit is coupled to the second multifunctional contact, the second voltage stabilizing protection unit is used to clamp the voltage at the second end of the second resistance unit within a first withstand voltage, and the first withstand voltage is used to characterize the withstand voltage upper limit of the first acquisition pin of the electrocardiogram detection chip; The ratio of the first impedance to 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 stabilizing protection unit, an operational amplifier unit and an operational amplifier switch control unit; the first end and the second end of the second resistive unit are respectively coupled to the first multifunctional contact and the in-phase input end of the operational amplifier unit; the first end of the second voltage stabilizing protection unit is coupled to the second end of the second resistive unit, and the second end of the second voltage stabilizing protection unit is coupled to the second multifunctional contact; the second voltage stabilizing protection unit is used to clamp the voltage at the second end of the second resistive unit within a second withstand voltage, and the second withstand voltage is used to characterize the withstand voltage upper limit of the in-phase input end of the operational amplifier unit; the output end of the operational amplifier unit is respectively connected to its own inverting input end and the first acquisition pin of the electrocardiogram detection chip; the operational amplifier switch control unit is used to enable the operational amplifier unit when performing electrocardiogram detection, and is used to disable the operational amplifier unit after completing the electrocardiogram detection; Among them, the ratio between the first impedance and the second impedance is less than a 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 in-phase input terminal, and the fourth impedance is used to characterize the sum of the impedances of the in-phase input terminal and the second resistive unit 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 switch unit, wherein a first end and a second end of the third switch unit are respectively connected to a non-inverting input end and an output end of the operational amplifier unit; the operational amplifier switch control unit is used for: When charging the internal power supply module or the system processing chip is communicating with the outside, turning off the third switch unit and disabling the operational amplifier unit; When the internal power supply module is not being charged, the system processing chip is not communicating externally, or the electrocardiogram detection chip is not detecting an electrocardiogram, the third switch unit is turned on and the operational amplifier unit is disabled; When performing electrocardiogram detection on the electrocardiogram detection chip, the third switch 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 stabilization 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 switch unit and an operational amplifier switch control unit; the in-phase input end of the operational amplifier unit is coupled to the first multifunctional contact, and the output end of the operational amplifier unit is respectively connected to its own inverting input end and the first acquisition pin of the electrocardiogram detection chip; the first end and the second end of the third switch unit are respectively connected to the in-phase input end and the output end of the operational amplifier unit; the operational amplifier switch control unit is used to: When charging the internal power supply module or the system processing chip is communicating with the outside, turning off the third switch unit and disabling the operational amplifier unit; When the internal power supply module is not being charged, the system processing chip is not communicating externally, or the electrocardiogram detection chip is not detecting an electrocardiogram, the third switch unit is turned on and the operational amplifier unit is disabled; When performing electrocardiogram detection on the electrocardiogram detection chip, turning off the third switch unit and enabling the operational amplifier unit; Among them, the voltage resistance of the operational amplifier unit and the voltage resistance of the third switch unit are both greater than a second threshold, the second threshold is greater than a charging voltage, and the charging voltage is used to characterize the voltage on the first multi-function 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 turn-off leakage current of the first switch unit, the second switch unit and the third switch unit is less than or equal to a 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 tube and a third resistive unit; the gate of the isolation NMOS tube is connected to the input voltage of the system processing chip, the source of the isolation NMOS tube is respectively coupled to the first end of the third resistive unit and the communication pin of the system processing chip, and the drain of the isolation NMOS tube is coupled to the second end of the first switch unit; the second end of the third resistive unit is also connected to the input voltage of the system processing chip.

11. A wearable device, characterized in that: A circuit control architecture comprising the wearable device according to any one of claims 1 to 10.

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