Touch wake-up circuit and electronic device

Abstract

The application discloses a touch wake-up circuit and an electronic device. The touch wake-up circuit comprises N touch buttons, a touch chip, N one-way conductive elements and a controller, wherein N is a positive integer. One touch button is electrically connected with one input pin of the touch chip, one output pin of the touch chip is electrically connected with a first end of one one-way conductive element, the second ends of the one-way conductive elements are short-circuited and electrically connected with a first input / output pin of the controller. The touch wake-up circuit is configured to: in response to any touch button being touched, the touch chip outputs a first level through the output pin corresponding to the touched touch button, the one-way conductive element corresponding to the output pin outputting the first level is turned on, and the first level is input to the first input / output pin to wake up the controller. In the above manner, the stability and reliability of touch wake-up can be improved.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, and in particular to a touch wake-up circuit and electronic device. Background Technology

[0002] A touch wake-up circuit is a circuit used to detect user touch and trigger the MCU (Microcontroller Unit) to wake up from a low-power state (such as standby or sleep mode).

[0003] Currently, touch wake-up circuits are typically implemented using an MCU with touch recognition capabilities and touch buttons. Specifically, when a user touches the touch button, a pre-set function within the MCU recognizes the touch and wakes the MCU from a low-power state to an active state. However, this method requires executing a significant amount of code, such as touch recognition, while the MCU is in a low-power state, leading to poor stability and reliability. Utility Model Content

[0004] This application provides a touch wake-up circuit and electronic device that can improve the stability and reliability of touch wake-up.

[0005] In a first aspect, embodiments of this application provide a touch wake-up circuit, comprising: N touch buttons, a touch chip, N unidirectional conductive elements, and a controller, wherein N is a positive integer; one touch button is electrically connected to an input pin of the touch chip, an output pin of the touch chip is electrically connected to a first end of a unidirectional conductive element, the second end of each unidirectional conductive element is short-circuited and electrically connected to a first input / output pin of the controller; the touch wake-up circuit is configured such that, in response to any of the touch buttons being touched, the touch chip and the output pin corresponding to the touched touch button output a first level, the unidirectional conductive element corresponding to the output pin that outputs the first level is turned on, and the first level is input to the first input / output pin to wake up the controller.

[0006] In one or more embodiments, the unidirectional conductive element is a diode; the cathode of the diode is the first end of the unidirectional conductive element, and the anode of the diode is the second end of the unidirectional conductive element.

[0007] In one or more embodiments, the touch wake-up circuit further includes: a sensitivity adjustment module electrically connected to the sensitivity adjustment pin of the touch chip, used to configure the sensitivity of the touch chip; and a first filtering module electrically connected to the power supply pin and a first power supply of the touch chip, used to filter the first power supply.

[0008] In one or more embodiments, the sensitivity adjustment module includes a first capacitor, a second capacitor, and a third capacitor; the first capacitor is electrically connected between the sensitivity adjustment pin and the power supply pin of the touch chip, the second capacitor is connected in parallel with the first capacitor, and the third capacitor is electrically connected between the power supply pin and ground of the touch chip.

[0009] In one or more embodiments, the first filtering module includes a fourth capacitor and a first resistor; the fourth capacitor is electrically connected between the power supply pin of the touch chip and ground, and the first resistor is electrically connected between the first power supply and the power supply pin of the touch chip.

[0010] In one or more embodiments, the touch wake-up circuit further includes: a program burning module electrically connected to the serial data input / output pin, the serial clock pin, and the reset pin of the controller, respectively, for writing a program to the controller; a reset auxiliary module electrically connected to the reset pin of the controller, for providing a filtered pull-up level to the reset pin of the controller; and a second filtering module electrically connected to the power supply pin and the first power supply of the controller, respectively, for filtering the first power supply.

[0011] In one or more embodiments, the programming module includes an interface, the interface including a first pin, a second pin, a third pin, a fourth pin, and a fifth pin; the first pin is electrically connected to the first power supply, the second pin is grounded, the third pin is electrically connected to the serial data input / output pin of the controller, the fourth pin is electrically connected to the reset pin of the controller, and the fifth pin is electrically connected to the serial clock pin of the controller.

[0012] In one or more embodiments, the reset auxiliary module includes a fifth capacitor, a second resistor, and a first diode; the second resistor and the fifth capacitor are connected in series between the reset pin of the controller and ground, the anode of the first diode is connected to the connection point between the second resistor and the fifth capacitor, and the cathode of the first diode is connected to the first power supply.

[0013] In one or more embodiments, the second filtering module includes a sixth capacitor and a seventh capacitor; the sixth capacitor is electrically connected between the power supply pin and the ground pin of the controller, the power supply pin of the controller is electrically connected to the first power supply, the ground pin of the controller is grounded, and the seventh capacitor is connected in parallel with the sixth capacitor.

[0014] Secondly, embodiments of this application provide an electronic device, including the touch wake-up circuit described above.

[0015] The beneficial effects of this application are as follows: The touch wake-up circuit of this application embodiment includes N touch buttons, a touch chip, N unidirectional conductive elements, and a controller, where N is a positive integer. A touch button is electrically connected to an input pin of the touch chip, and an output pin of the touch chip is electrically connected to the first end of a unidirectional conductive element. The second end of each unidirectional conductive element is short-circuited and electrically connected to the first input / output pin of the controller. The touch wake-up circuit is configured such that, in response to any touch button being touched, the touch chip and the output pin corresponding to the touched touch button output a first level, the unidirectional conductive element corresponding to the output pin that outputs the first level is turned on, and the first level is input to the first input / output pin to wake up the controller. Through the above process, the process of waking up the controller based on hardware such as touch buttons, touch chips, and unidirectional conductive elements is realized. Compared with the method of using an MCU with touch recognition function in related technologies, this application can reliably and stably realize the touch wake-up function. Furthermore, by setting multiple touch buttons and assigning each touch button to a different function, the controller can be woken up when different functions are activated, ensuring the reliable operation of each function. Attached Figure Description

[0016] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, which are not intended to limit the embodiments, and elements having the same reference numerals in the drawings are designated as similar elements.

[0017] Figure 1 This is a schematic diagram of the touch wake-up circuit provided in the embodiments of this application. Figure 1 ; Figure 2 This is a schematic diagram of the touch wake-up circuit provided in the embodiments of this application. Figure 2 ; Figure 3 This is a schematic diagram of the touch wake-up circuit provided in the embodiments of this application. Figure 3 ; Figure 4 This is a schematic diagram of the touch wake-up circuit provided in the embodiments of this application. Figure 4 . Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and thoroughly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0019] It should be noted that when an element is described as "connected" to another element, it can be directly connected to the other element, or there can be one or more intermediate elements between them.

[0020] Furthermore, the technical features involved in the various embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0021] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the block diagram of the touch wake-up circuit provided in an embodiment of this application. Figure 1 As shown, the touch wake-up circuit 100 includes N touch buttons, a touch chip 10, N unidirectional conductive elements, and a controller 20, where N is a positive integer. The N touch buttons include a first touch button K1, a second touch button K2, ..., an Nth touch button KN. The N unidirectional conductive elements include a first unidirectional conductive element D1, a second unidirectional conductive element D2, ..., an Nth unidirectional conductive element DN.

[0022] The touch button is a type of button that operates through touch sensing. Unlike traditional mechanical buttons, touch buttons have no movable parts and rely on changes in capacitance or resistance to detect user touch actions. The touch chip 10 is used to detect changes in capacitance or resistance and convert these changes into electrical signals. A unidirectional conductive element is an electronic component that allows current to flow in only one direction. By setting up each unidirectional conductive element, the backflow of the voltage level signal of the first node N1 can be prevented from flowing back to the touch chip 10.

[0023] One touch button is electrically connected to an input pin of the touch chip; for example, the first touch button K1 is electrically connected to the first input pin of the touch chip 10. One output pin of the touch chip is electrically connected to the first end of a unidirectional conductive element; for example, one output pin of the touch chip 10 is electrically connected to the first end of the first unidirectional conductive unit D1. The second ends of each unidirectional conductive unit are short-circuited and electrically connected to the first input / output pin of the controller 20. Specifically, the second ends of the first unidirectional conductive element D1, the second ends of the second unidirectional conductive element D2, ..., the second ends of the Nth unidirectional conductive element DN are short-circuited to the first node N1, and the first node N1 is electrically connected to the first input / output pin of the controller 20.

[0024] The touch wake-up circuit 100 is configured such that, in response to any touch button being touched, the touch chip 10 outputs a first level on the output pin corresponding to the touched touch button, and the unidirectional conductive unit corresponding to the output pin that outputs the first level is turned on, and the first level is input to the first input / output pin to wake up the controller 20. Specifically, when the first touch button K1 is touched, the first output pin of the touch chip 10 outputs a first level to the first unidirectional conductive unit D1, turning on the first unidirectional conductive unit D1. The first level is then input to the first input / output pin of the controller 20 through the first unidirectional conductive unit D1 to wake up the controller 20. When the second touch button K2 is touched, the second output pin of the touch chip 10 outputs a first level to the second unidirectional conductive unit D2, turning on the second unidirectional conductive unit D2. The first level is then input to the first input / output pin of the controller 20 through the second unidirectional conductive unit D2 to wake up the controller 20. ... When the Nth touch button KN is touched, the Nth output pin of the touch chip 10 outputs a first level to the Nth unidirectional conductive unit DN, turning on the Nth unidirectional conductive unit DN. The first level is then input to the first input / output pin of the controller 20 through the Nth unidirectional conductive unit DN to wake up the controller 20.

[0025] Through the above process, the process of waking up the controller 20 based on hardware such as touch buttons, touch chip 10 and unidirectional conductive elements is realized. Compared with the MCU with touch recognition function in related technologies, the signal of the wake-up controller 20 in this application can be more easily recognized by the controller 20, because only the simple procedure of setting the recognition level is required, and the rest of the process is implemented through hardware structure, so that the touch wake-up function can be realized more reliably and stably.

[0026] Secondly, by setting multiple touch buttons and assigning each touch button a different function, the controller 20 can be woken up when different functions are activated, ensuring the reliable operation of each function. For example, the first touch button K1 is also used to turn on the lights. Therefore, when the first touch button K1 is touched, the controller 20 is woken up, and the lights are turned on simultaneously.

[0027] In some embodiments, such as Figure 2 As shown, the touch wake-up circuit 100 also includes a sensitivity adjustment module 30 and a first filtering module 40.

[0028] The sensitivity adjustment module 30 is electrically connected to the sensitivity adjustment pin of the touch chip 10, and is used to configure the sensitivity of the touch chip 10. The sensitivity of the touch chip 10 refers to its ability to detect touch actions, specifically the accuracy and timeliness of its response to touch input.

[0029] The first filtering module 40 is electrically connected to the power supply pins of the touch chip 10 and the first power supply V1. The first filtering module 40 is used to filter the first power supply V1. The first filtering module 40 is used to filter out the high-frequency interference in the first power supply V1, so as to reduce the risk of damage to the touch chip 10 due to excessive input power.

[0030] In some embodiments, such as Figure 3 As shown, the touch wake-up circuit 100 also includes a program burning module 50, a reset auxiliary module 60, and a second filtering module 70.

[0031] The programming module 50 is electrically connected to the serial data input / output pins, serial clock pin, and reset pin of the controller 20. The programming module 50 writes programs to the controller 20, enabling the controller 20 to perform logic operations corresponding to the level of the written program. For example, the programming module 50 can write a program that recognizes a first level to the controller 20, so that the controller 20 is awakened upon recognizing the first level.

[0032] The reset auxiliary module 60 is electrically connected to the reset pin of the controller 20. The reset auxiliary module 60 provides a filtered pull-up level to the reset pin of the controller 20. When no reset operation is triggered, the reset auxiliary module 60 inputs the pull-up level to the reset pin of the controller 20, keeping the reset pin of the controller 20 at a high level. This ensures that the internal reset logic of the controller 20 will not be falsely triggered.

[0033] The second filtering module 70 is electrically connected to the power supply pins of the controller 20 and the first power supply V1, respectively. The second filtering module 70 is used to filter the first power supply V1. The second filtering module 70 is used to filter out the high-frequency interference in the first power supply V1, so as to reduce the risk of the controller 20 being damaged due to excessive input power.

[0034] Please refer to Figure 4 , Figure 4 An example is shown with Figure 3 The block diagram shown corresponds to one type of circuit structure. For example... Figure 4 As shown, the unidirectional conductive element is a diode, with the cathode of the diode being the first terminal and the anode being the second terminal. For example, the first unidirectional conductive element D1 is a diode, with the cathode of the diode being the first terminal and the anode being the second terminal.

[0035] In some embodiments, the sensitivity adjustment module 30 includes a first capacitor C1, a second capacitor C2, and a third capacitor C3. The first capacitor C1 is electrically connected between the sensitivity adjustment pin and the power supply pin of the touch chip 10, the second capacitor C2 is connected in parallel with the first capacitor C1, and the third capacitor C3 is electrically connected between the power supply pin and ground GND of the touch chip 10.

[0036] In this design, capacitors C1 and C2 are used to adjust touch sensitivity. Specifically, when ambient noise is high or higher stability of the touch sensor is required, the capacitance values ​​of C1 and C2 can be increased to reduce the system's sensitivity to external interference. This is because larger capacitance values ​​can smooth voltage fluctuations and reduce false triggers caused by slight contact or environmental changes. Conversely, if it is desired to improve touch sensitivity so that the system can more easily recognize light touches or near-touch actions, the capacitance values ​​of C1 and C2 can be appropriately decreased. The third capacitor, C3, is a filter capacitor.

[0037] In some embodiments, the first filtering module 40 includes a fourth capacitor C4 and a first resistor R1.

[0038] The fourth capacitor C4 is electrically connected between the power supply pin of the touch chip 10 and ground GND, and the first resistor R1 is electrically connected between the first power supply V1 and the power supply pin of the touch chip 10. The fourth capacitor C4 and the first resistor R1 form an RC filter circuit.

[0039] In some embodiments, the program burning module 50 includes an interface 51, which includes a first pin J1, a second pin J2, a third pin J3, a fourth pin J4, and a fifth pin J5.

[0040] The first pin J1 is electrically connected to the first power supply V1, the second pin J2 is grounded (GND), the third pin J3 is electrically connected to the serial data input / output pin of the controller 20, the fourth pin J4 is electrically connected to the reset pin of the controller 20, and the fifth pin J5 is electrically connected to the serial clock pin of the controller 20. Among these, the third pin J3, the fourth pin J4, and the fifth pin J5 are for programming data. These three pins are used to connect to external electronic devices such as a host computer, allowing the program to be written into the controller 20 via software programming.

[0041] In some embodiments, the reset auxiliary module 60 includes a fifth capacitor C5, a second resistor R2, and a first diode D1.

[0042] The second resistor R2 and the fifth capacitor C5 are connected in series between the reset pin of the controller 20 and ground GND. The anode of the first diode D1 is connected to the junction between the second resistor R2 and the fifth capacitor C5, and the cathode of the first diode D1 is connected to the first power supply V1. The second resistor R2 is a reset pull-up resistor, providing a reliable pull-up level to the reset pin of the controller 20. The fifth capacitor C5 is a filter capacitor. The function of the first diode D1 is that when the first power supply V1 is disconnected, there is still a certain voltage on the fifth capacitor C5, and its discharge rate is slow. Adding the first diode D1 can accelerate the discharge rate. Thus, the fifth capacitor C5 can discharge quickly when the power is off, allowing the controller 20 to discharge quickly and stop working, protecting the controller 20 from the impact of slow voltage fluctuations on its reliability, and reducing the possibility of damage to the controller 20.

[0043] In some embodiments, the second filtering module 70 includes a sixth capacitor C6 and a seventh capacitor C7.

[0044] The sixth capacitor C6 is electrically connected between the power supply pin and the ground pin of controller 20. The power supply pin of controller 20 is electrically connected to the first power supply V1, and the ground pin of controller 20 is grounded to GND. The seventh capacitor C7 is connected in parallel with the sixth capacitor C6. These two capacitors, the sixth capacitor C6 and the seventh capacitor C7, are filter capacitors for the power input of controller 20, ensuring the stability of the input power supply of controller 20.

[0045] It is understandable that, since there are different types of touch chips 10, the specific pin definitions may differ when using different types of touch chips 10, but the functions and signal definitions are the same. The following description uses the FTC534L touch chip 10 as an example. If other types of touch chips 10 are used, they can be set up in a similar manner to the above embodiment, which is easily understood by those skilled in the art and will not be elaborated here.

[0046] For the FTC534L touch chip 10, pins 1 to 6 are input pins, which can be connected to six touch buttons; pin 7 is a ground pin, used to ground to GND; pin 8 is a signal output configuration pin. When the signal output configuration pin is grounded, the corresponding output pin outputs a low level when any touch button is touched; when the signal output pin is floating, the corresponding output pin outputs a high level when any touch button is touched; pins 9, 10, and 13 to 16 are output pins; pin 11 is a power supply pin; and pin 12 is a sensitivity adjustment pin.

[0047] When the electronic device including the touch wake-up circuit 100 is powered off, the electronic device enters a standby state. The first input / output pin of the controller 20 is set as a pin for detecting input or as a pin for outputting a high level. At the same time, the controller 20 enters a sleep state (that is, the controller 20 will turn off or reduce the operating frequency or power supply of many functional modules, while maintaining the most basic functions so that it can quickly resume normal operation under specific conditions). The loads in the electronic device also stop working to keep the power consumption of the electronic device low. In this case, if any touch button (taking the first touch button K1 as an example) is touched, the output pin of the touch chip 10 corresponding to the touch button outputs a low level (in this embodiment, the first level is low). That is, the first output pin of the touch chip 10 outputs a low level, and the first diode corresponding to the first output pin is turned on. The first level is input to the first input / output pin of the controller 20 through the first diode, and the controller 20 is woken up.

[0048] Through the above process, the wake-up controller 20 is realized based on hardware such as touch buttons, touch chip 10, and unidirectional conductive elements. Compared with the method of using an MCU with touch recognition function in related technologies, the wake-up signal of the controller 20 in this application can be more easily recognized by the controller 20, because only a simple procedure of setting the recognition level is required, and the rest of the process is implemented through hardware structure, thus realizing the touch wake-up function more reliably and stably. Secondly, by setting multiple touch buttons and assigning each touch button to a different function, the controller 20 can be woken up when different functions are activated, ensuring the reliable operation of each function.

[0049] This application also provides an electronic device, which includes the touch wake-up circuit 100 in any embodiment of this application.

[0050] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

[0051] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A touch-activated wake-up circuit, characterized in that, include: N touch buttons, touch chips, N unidirectional conductive components and controller, where N is a positive integer; A touch button is electrically connected to an input pin of the touch chip, an output pin of the touch chip is electrically connected to the first end of a unidirectional conductive element, and the second end of each unidirectional conductive element is short-circuited and electrically connected to the first input / output pin of the controller. The touch wake-up circuit is configured as follows: In response to any of the touch buttons being touched, the touch chip outputs a first level on the output pin corresponding to the touched touch button, and the unidirectional conductive unit corresponding to the output pin that outputs the first level is turned on. The first level is input to the first input / output pin to wake up the controller.

2. The touch wake-up circuit according to claim 1, characterized in that, The unidirectional conductive element is a diode; The cathode of the diode is the first end of the unidirectional conductive element, and the anode of the diode is the second end of the unidirectional conductive element.

3. The touch wake-up circuit according to claim 1 or 2, characterized in that, The touch wake-up circuit also includes: A sensitivity adjustment module is electrically connected to the sensitivity adjustment pin of the touch chip and is used to configure the sensitivity of the touch chip. The first filtering module is electrically connected to the power pin of the touch chip and the first power supply, and is used to filter the first power supply.

4. The touch wake-up circuit according to claim 3, characterized in that, The sensitivity adjustment module includes a first capacitor, a second capacitor, and a third capacitor; The first capacitor is electrically connected between the sensitivity adjustment pin and the power supply pin of the touch chip, the second capacitor is connected in parallel with the first capacitor, and the third capacitor is electrically connected between the power supply pin and ground of the touch chip.

5. The touch wake-up circuit according to claim 3, characterized in that, The first filtering module includes a fourth capacitor and a first resistor; The fourth capacitor is electrically connected between the power supply pin of the touch chip and ground, and the first resistor is electrically connected between the first power supply and the power supply pin of the touch chip.

6. The touch wake-up circuit according to claim 1 or 2, characterized in that, The touch wake-up circuit also includes: The program programming module is electrically connected to the serial data input / output pin, the serial clock pin, and the reset pin of the controller, respectively, and is used to write the program to the controller. A reset auxiliary module, electrically connected to the reset pin of the controller, is used to provide a filtered pull-up level to the reset pin of the controller; The second filtering module is electrically connected to the power supply pins of the controller and the first power supply, respectively, and is used to filter the first power supply.

7. The touch wake-up circuit according to claim 6, characterized in that, The program burning module includes an interface, which includes a first pin, a second pin, a third pin, a fourth pin, and a fifth pin. The first pin is electrically connected to the first power supply, the second pin is grounded, the third pin is electrically connected to the serial data input / output pin of the controller, the fourth pin is electrically connected to the reset pin of the controller, and the fifth pin is electrically connected to the serial clock pin of the controller.

8. The touch wake-up circuit according to claim 6, characterized in that, The reset auxiliary module includes a fifth capacitor, a second resistor, and a first diode; The second resistor and the fifth capacitor are connected in series between the reset pin of the controller and ground. The anode of the first diode is connected to the connection point between the second resistor and the fifth capacitor, and the cathode of the first diode is connected to the first power supply.

9. The touch wake-up circuit according to claim 6, characterized in that, The second filtering module includes a sixth capacitor and a seventh capacitor; The sixth capacitor is electrically connected between the power supply pin and the ground pin of the controller. The power supply pin of the controller is electrically connected to the first power supply, and the ground pin of the controller is grounded. The seventh capacitor is connected in parallel with the sixth capacitor.

10. An electronic device, characterized in that, Includes the touch wake-up circuit as described in any one of claims 1-9.

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