CN115378418A - Touch key dormancy awakening circuit and awakening method - Google Patents
Touch key dormancy awakening circuit and awakening method Download PDFInfo
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- CN115378418A CN115378418A CN202211316594.8A CN202211316594A CN115378418A CN 115378418 A CN115378418 A CN 115378418A CN 202211316594 A CN202211316594 A CN 202211316594A CN 115378418 A CN115378418 A CN 115378418A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K17/962—Capacitive touch switches
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3206—Monitoring of events, devices or parameters that trigger a change in power modality
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3234—Power saving characterised by the action undertaken
- G06F1/3243—Power saving in microcontroller unit
Abstract
The invention discloses a touch key dormancy awakening circuit and an awakening method, wherein the touch key dormancy awakening circuit comprises a first reference voltage, a second reference voltage, a touch key sensor, a current limiting element, a comparator and an MCU awakening control unit; one end of the current limiting element and one end of the touch key sensor are both connected with a first input end of the comparator, the other end of the current limiting element is connected with a first reference voltage, and the other end of the touch key sensor is grounded; a second input end of the comparator is connected with a second reference voltage; the output end of the comparator is connected with the MCU awakening control unit, the second reference voltage is proportional to the first reference voltage, and the second reference voltage is smaller than the first reference voltage. The invention does not need MCU to wake up at regular time, and only wakes up when the touch key is touched, thereby greatly reducing the power consumption of waking up and reducing the energy consumption of products.
Description
Technical Field
The invention relates to the technical field of touch keys, in particular to a sleep awakening circuit and an awakening method for a touch key.
Background
Compared with the traditional mechanical key, the capacitive touch sensor has the outstanding advantages of long service life, difficult abrasion, fashion, beauty, low cost and the like. But on battery powered low power consumption equipment, compare conventional button and can provide the level change and awaken up MCU, touch button usually need awaken up through MCU timing and detect and realize the button detection, in order to prevent lou to detect the button, the awakening frequency can not too low, brings extra power consumption.
Fig. 1 shows a schematic diagram of a touch key, where a capacitance detected by a touch key module is a parasitic capacitance C of a touch sensor under the condition that no human body touches the touch key module X In the case of human touch, an extra capacitance, C, is generated T Is a body capacitor, C F For equivalent capacitance between system ground and earth, depending on the difference in grounding conditions of the touch device, C F There are differences.
Generally, a battery power supply device is in a dormant state in order to save power consumption, but in order to respond to possible human touch operation, the MCU is awakened once in hundreds of milliseconds in the prior art, touch key scanning is performed, the main crystal oscillator is stable, the scanning time usually needs several milliseconds, and touch can be generated in practical application for several hours or even longer, so that the power consumption of the MCU is greatly wasted.
In order to solve the problem that a timing wake-up scheme wastes a large amount of power consumption, two wake-up circuits exist in the prior art. (1) The touch key sensor needs to be charged accurately at regular time, so that the voltage on the capacitor of the touch key sensor can be compared, but the timing charging needs a clock module, and the precision requirement on the clock module is higher, because the charging duration directly determines the voltage value, the awakening effect is further influenced, and the cost is increased. (2) In another wake-up circuit disclosed in patent CN210274025U by the applicant, a touch point is connected to a wake-up pin, the wake-up pin is connected to a power supply of a single chip microcomputer through a pull-up resistor or connected to a ground of the single chip microcomputer through a pull-down resistor, a clutter signal (low frequency) induced by a human body is introduced by touching the touch point by the human body, and a peak-to-peak value of the clutter signal can reach a condition for triggering the single chip microcomputer to wake up, so that wake-up is realized. However, the method utilizes the clutter induced by the human body, the discreteness is high, the quantitative analysis is not convenient, when a cover plate is added on the touch key sensor, or due to the difference of the human body, the amplitude of the introduced clutter signal can not reach the awakening condition, a perfect self-adaptive mechanism is not provided, and the possibility of false triggering or difficult triggering exists.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problems of large wake-up power consumption and high circuit cost of the touch key wake-up circuit in the prior art, the invention provides a touch key dormancy wake-up circuit and a wake-up method.
The technical scheme is as follows: a touch key dormancy awakening circuit comprises a first reference voltage, a second reference voltage, a touch key sensor, a current limiting element, a comparator and an MCU awakening control unit; one end of the current limiting element and one end of the touch key sensor are both connected with a first input end of the comparator, the other end of the current limiting element is connected with a first reference voltage, and the other end of the touch key sensor is grounded; the second input end of the comparator is connected with a second reference voltage; the output end of the comparator is connected with the MCU awakening control unit, the second reference voltage is proportional to the first reference voltage, and the second reference voltage is smaller than the first reference voltage.
Further, the second reference voltage is divided by the first reference voltage.
The voltage regulator further comprises a first voltage-dividing resistor and a second voltage-dividing resistor, wherein the first reference voltage, the first voltage-dividing resistor, the second voltage-dividing resistor and the ground are sequentially connected, and the second reference voltage is output at the connection position of the first voltage-dividing resistor and the second voltage-dividing resistor.
Furthermore, the touch key sensors are multiple and are connected in parallel.
Further, the current limiting element is a resistor.
Further, the first reference voltage is an internal voltage or a system power supply voltage.
A touch key sleep wake-up method using the touch key sleep wake-up circuit comprises the following steps:
the method comprises the following steps: the MCU is powered on, and the second reference voltage is adjusted to be an initial value;
step two: the MCU enters a sleep state and waits to be awakened;
step three: when the MCU is awakened, checking an awakening source, if the awakening source comes from the output channel of the comparator, scanning the awakening channel touch keys one by one, if the keys are pressed in the scanning result, performing key processing, if the keys are not pressed in the scanning result, judging that false triggering is performed, and returning to the step two; when frequent false triggering occurs, adjusting the second reference voltage to make the comparator more difficult to jump, and returning to the step two; and if the awakening source is from the RTC, adjusting the second reference voltage to enable the comparator to jump more easily, detecting whether the output of the comparator jumps or not after adjustment, if so, recovering the second reference voltage to be the set value before the adjustment, returning to the step two, and if not, directly returning to the step two.
Further, a first time threshold is set, in the second step, when the duration of the MCU entering the sleep state exceeds the first time threshold, the RTC starts to wake up, and continues to execute the third step.
Further, in the third step, the method for determining frequent false triggering is one of the following:
setting a second time threshold, and if the time interval of two continuous false triggers is less than the second time threshold, determining that frequent false triggers occur;
and setting a fixed time length and a time threshold, and if the number of false triggering exceeds the time threshold in the fixed time length, determining that frequent false triggering occurs.
Further, in the first step, the initial value is a maximum value that the second reference voltage can adjust.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, through designing the wake-up circuit, a stable voltage exists in the touch key sensor when the charging is finished, the stable voltage is input to one end of the comparator, when the touch key is touched, the stable voltage is reduced, the voltage reduction can be kept for a certain time under the action of the current limiting element, the comparison of the comparator is realized in the time period, and the comparator can jump when the key is touched only by adjusting the proper proportion of the first reference voltage and the second reference voltage, so that the MCU wake-up control unit is awakened. The MCU does not need to be awakened at regular time, and the active awakening is converted into the passive awakening, so that the awakening power consumption is greatly reduced. Compared with the traditional awakening method for awakening the MCU regularly, the awakening power consumption of the patent can be reduced by more than 90%.
2. The circuit structure is simple, components and parts are few, and are with low costs, need not timing module and regularly charge to touch button sensor, save the timing module that the control sensor charges, compare the awakening circuit that regularly charges can greatly reduced cost.
3. The second reference voltage is adjusted according to actual conditions, the condition that frequent false triggering or long-time triggering is not achieved is avoided, and V caused by overlarge capacitance in multi-channel parallel detection can be avoided cmp The change is small and the awakening is not easy.
4. The method is suitable for the condition that a plurality of touch keys are awakened at the same time. And connecting a plurality of touch key sensors in parallel, wherein when any one sensor is touched, the MCU can be awakened, and the touched key is determined through subsequent scanning.
Drawings
FIG. 1 is a schematic diagram of a touch key;
FIG. 2 is a schematic diagram of a touch key sleep wake-up circuit according to an embodiment;
FIG. 3 is a flowchart illustrating a method for waking up a touch key from sleep mode according to an embodiment;
fig. 4 shows the change in the level of the touch key sensor after a touch has occurred.
Detailed Description
The invention is further explained below with reference to the figures and the specific embodiments.
The first embodiment is as follows:
as shown in FIG. 2, a sleep wake-up circuit for touch key comprises a first reference voltage V ref1 A second reference voltage V ref2 The device comprises a touch key sensor, a current limiting element, a comparator and an MCU (microprogrammed control unit) awakening control unit. A first reference voltage V ref1 The voltage may be an internal voltage of the chip or a system power supply voltage. The current limiting element adopts a current limiting resistor R 1 Current limiting resistor R 1 Is a large resistor with a resistance value R 1 ≧ 1M Ω, for example, R is preferable 1 The current limiting resistor is 5M omega, the precision of the current limiting resistor is not required, and the current limiting effect can be realized by an MOS tube with the L size being far larger than the W size. Current limiting resistor R 1 One end of the touch key sensor and one end of the touch key sensor are both connected with the first input end of the comparator,current limiting resistor R 1 Is connected with a first reference voltage V ref1 And the other end of the touch key sensor is grounded. The second input end of the comparator is connected with a second reference voltage V ref2 The output end of the comparator is connected with the MCU awakening control unit. Second reference voltage V ref2 And a first reference voltage V ref1 Proportionally, it can be generated independently or the first reference voltage V can be generated ref1 Dividing the voltage to obtain a second reference voltage V ref2 Only need to satisfy V ref2 =a*V ref1 And a is more than 0 and less than 1, and if a is 0.9, the value can be selected. However, if two independent reference voltages are used, the relative ratio thereof may have an error, for example, in the case of temperature change, the two independent reference voltages may have different degrees of deviation, which causes inaccurate ratio result. The method of dividing the first reference voltage into the second reference voltage is preferred because the first reference voltage and the second reference voltage have an accurate relative proportion relationship and cannot form a proportion error due to temperature change.
The specific voltage dividing method is not limited, for example, in the embodiment, a group of voltage dividing resistors is selected to divide the voltage, and the voltage dividing resistors include R 2 、R 3 For a first reference voltage V ref1 Dividing the voltage to obtain a second reference voltage V ref2 . The voltage division can also be realized by serially connecting MOS multiple tubes with L size being far larger than W size. In this embodiment, the first input terminal of the comparator is an in-phase input terminal, the second input terminal is an inverting input terminal, the connection mode of the two input terminals is not limited, and the purpose of waking up can be achieved as long as the comparator generates jump when the level on the touch key sensor changes.
The voltage-dividing resistor R 2 、R 3 The voltage division ratio can be a fixed value or an adjustable value, and the size of the reference voltage cannot be adjusted in the fixed value, so that the size of the reference voltage needs to be determined before the product leaves a factory, and the reference voltage is just in a critical state for jumping the comparator, for example, R 2 =0.1*R 3 . In order to be able to adjust the reference voltage during operation as a function of the use, a voltage-dividing resistor R 2 、R 3 At least one of them adopts adjustable resistor to cope with special environment lower frequency at any timeFrequently false triggering or incapability of waking up. In addition, larger R may be selected 2 And R 3 To further limit the power consumption of the wake-up circuit.
Different with the touch button wake-up circuit that traditional timing charges is, the touch button sensor that traditional timing charges need regularly charge to it, need use timing module, carry out accurate charging, but the wake-up circuit of this embodiment need not the timing module that charges, only need not awaken up for a long time and use RTC to awaken once in order to avoid, but the RTC that uses here does not have too high requirement to the precision, compare control touch button sensor charging's timing module precision greatly reduced, cost greatly reduced also.
As shown in fig. 3, the touch key sleep/wake-up method using the touch key sleep/wake-up circuit includes the following steps:
the method comprises the following steps: and powering on the MCU, and adjusting the second reference voltage as an initial value.
In this embodiment, the initial value of the second reference voltage is the adjustable maximum value, and the second reference voltage is continuously adjusted from the large value to the small value until the false trigger is not generated any more, and the second reference voltage is the critical value at this time. Particularly for battery-powered equipment, no strong power supply interference exists, and the measurement fluctuation is small when no human body touches the equipment, so that the second reference voltage approaches the critical value in the mode as much as possible, and false triggering is not generated. The advantage of approaching the critical value is to make the real human body response sensitive and not to be leaked.
It should be noted that, the second reference voltage is selected to be adjusted from a large value to a small value, because the optimal manner is that in an application scenario of wake-up by touch buttons, it is required to avoid the situation that touch occurs but wake-up does not occur as much as possible, but as for false triggering generated in the adjustment process, at most, only a little power consumption is consumed, and the influence of the little power consumption consumed by the false triggering with limited times on the whole battery power consumption cycle is very small, and the use of the product is not influenced.
Step two: the MCU enters a sleep state waiting to be woken up.
In this step, in order to prevent the situation that the MCU cannot wake up for a long time (several minutes or several hours) due to external reasons (such as deformation of the cover plate), a first time threshold (e.g. 5 to 10 minutes) may be set, and when the MCU enters the sleep state for a duration exceeding the first time threshold, the RTC starts to wake up, and continues to execute step three. The purpose of setting the RTC wake-up is to prevent the second reference voltage from taking an inappropriate value, and when the second reference voltage cannot be woken up, wake-up is performed through the RTC, and the second reference voltage is adjusted, so that the comparator is easier to trigger, and the wake-up circuit recovers to be normal, for example, the second reference voltage should be increased in this embodiment. The first time threshold is essentially different from the timing in prior art timed wake-up methods, which typically wake-up for hundreds of milliseconds, whereas the first time threshold is in the order of minutes, which can be adjusted according to the external environment and is much longer than the duration in prior art timed wake-up.
Step three: when the MCU is woken up, the wake-up source is checked, which may be from the comparator output channel, the RTC, or even other wake-up sources (not described much because it is irrelevant to this patent);
if the awakening source is from the output channel of the comparator, the touch keys of the awakening channel are scanned one by one, if the keys are pressed down in the scanning result, the key processing is carried out, if the keys are not pressed down in the scanning result, the false triggering is judged, and the step two is returned; when frequent false triggering occurs, adjusting the second reference voltage to make the comparator more difficult to jump, and returning to the step two;
and if the wake-up source is from the RTC, adjusting the second reference voltage to enable the comparator to jump more easily, detecting whether the output of the comparator jumps or not after adjustment, if jumping occurs, recovering the second reference voltage to be the set value before the adjustment, returning to the step two, and if no jumping occurs, directly returning to the step two.
The false triggering may occur because the detection value is already smaller than the reference value without the key being pressed, or because the detection value is too close to the reference value due to interference. Therefore, when frequent false triggering occurs, the second reference voltage needs to be adjusted accordingly, and in this embodiment, the second reference voltage should be adjusted to be small, so that the comparator is more difficult to trigger, and the adjustment step can be set to one resolution unit each time. Of course, the specific adjustment to be made larger or smaller needs to be flexibly selected by combining the connection mode of the input end of the comparator.
For the determination of frequent false triggering, one of the following two methods can be adopted, but not limited to:
(1) And setting a second time threshold, and if the time interval between two continuous false triggers is smaller than the second time threshold, determining that frequent false triggers occur.
(2) And setting a fixed time length and a time threshold, and if the number of false triggering exceeds the time threshold in the fixed time length, determining that frequent false triggering occurs.
In the above process, the method for adjusting the second reference voltage includes: by adjusting the divider resistance R 2 、R 3 The partial pressure proportion of (2) is realized, and the specific adjustable R 2 Optionally, R may be adjusted 3 E.g. to increase R 3 Or decrease R 2 I.e. increase the reference voltage and decrease R 3 Or increase R 2 The reference voltage is turned down. In this example, R 2 =K×R 3 ，R 2 Tunable by tuning K to a minimum value such that R 2 The minimum and the second reference voltage are the maximum.
The second reference voltage is adjusted according to actual conditions, so that the problems of frequent false triggering and no awakening can be avoided, and V when a plurality of touch key channels are touched due to overlarge capacitance in parallel detection can be solved cmp1 The change is small and the arousal problem is generated.
The working principle is as follows:
in this embodiment, C all The voltage of the first input end and the voltage of the second input end of the comparator are respectively V for the total equivalent capacitance on the touch sensor cmp1 And V ref2 。V ref2 By a set of voltage dividing resistors R 2 、R 3 For the first reference voltage V ref1 By dividing the pressure, set R 2 =K×R 3 . Adjusting the second reference voltage V by adjusting the value of K ref2 And a first reference voltage V ref1 In such a ratio that V ref2 At a critical value, e.g. V ref2 =0.9* V ref1 . When no touch is present, the total equivalent capacitance on the touch sensor is C all The chip mainly comprises parasitic capacitors such as an internal PAD of the chip to the ground and an external PIN PIN to the ground, and V cmp1 Voltage value equal to V when entering steady state ref1 . When the touch key is touched, an incremental capacitor is additionally incorporated on the original equivalent capacitor, so that the total equivalent capacitor C all Become large, resulting in V in a short time cmp1 Descend by V cmp1 ＞V ref2 Becomes V cmp1 ＜V ref2 Due to the large resistance R 1 Flow-limiting action of V cmp1 Will be at V ref2 And keeping for a period of time, wherein the time is enough for the comparator to compare, so that the output jumps, the MCU awakening control unit receives an effective awakening signal, and the MCU awakens to perform subsequent accurate scanning so as to determine which channel touch key sensor triggers awakening. V ref2 And V ref1 Is mainly dependent on the post-touch V cmp1 Voltage change and sensitivity of comparator, V after touch cmp1 The voltage change of (2) is shown in fig. 4.
Example two:
the difference between the second embodiment and the first embodiment is that the touch key sensors in the second embodiment are multiple and are connected in parallel, and a switch can be arranged between each sensor and the first input end of the comparator according to actual needs, so that which touch keys participate in the wake-up of the wake-up circuit can be conveniently selected. And a switch is not needed, and all touch key sensors connected in the circuit participate in the awakening of the awakening circuit.
In all touch key sensors participating in awakening of the awakening circuit, V is set as long as any key in the touch key sensors is touched cmp1 The time delay time of the multi-channel touch key is reduced, so that the comparator jumps to wake up the MCU, and the effect of simultaneously waking up the multi-channel touch key is realized.
Claims (10)
1. A touch key dormancy awakening circuit is characterized by comprising a first reference voltage, a second reference voltage, a touch key sensor, a current limiting element, a comparator and an MCU awakening control unit; one end of the current limiting element and one end of the touch key sensor are both connected with a first input end of the comparator, the other end of the current limiting element is connected with a first reference voltage, and the other end of the touch key sensor is grounded; the second input end of the comparator is connected with a second reference voltage; the output end of the comparator is connected with the MCU awakening control unit, the second reference voltage is proportional to the first reference voltage, and the second reference voltage is smaller than the first reference voltage.
2. The touch key sleep wake-up circuit of claim 1, wherein the second reference voltage is divided by the first reference voltage.
3. The wake-up circuit for touch key sleep of claim 2, further comprising a first voltage dividing resistor and a second voltage dividing resistor, wherein the first reference voltage, the first voltage dividing resistor, the second voltage dividing resistor and ground are sequentially connected, and the second reference voltage is outputted at the connection of the first voltage dividing resistor and the second voltage dividing resistor.
4. The touch key sleep wake-up circuit according to any one of claims 1 to 3, wherein there are a plurality of touch key sensors, and the plurality of touch key sensors are connected in parallel.
5. The touch key sleep wake-up circuit according to any of claims 1 to 3, wherein the current limiting element is a resistor.
6. The touch key sleep wake-up circuit according to any of claims 1 to 3, wherein the first reference voltage is an internal voltage or a system power voltage.
7. A touch key sleep wake-up method using the touch key sleep wake-up circuit of any one of claims 1 to 6, comprising the steps of:
the method comprises the following steps: powering on the MCU, and adjusting a second reference voltage as an initial value;
step two: the MCU enters a sleep state and waits to be awakened;
step three: when the MCU is awakened, checking an awakening source, if the awakening source comes from the output channel of the comparator, scanning the awakening channel touch keys one by one, if the keys are pressed in the scanning result, performing key processing, if the keys are not pressed in the scanning result, judging that false triggering is performed, and returning to the step two; when frequent false triggering occurs, adjusting the second reference voltage to make the comparator more difficult to jump, and returning to the step two; if the wake-up source is from the RTC, adjusting the second reference voltage to enable the comparator to jump more easily, detecting whether the output of the comparator jumps or not after adjustment, if jumping occurs, recovering the second reference voltage to be the set value before the adjustment, returning to the step two, and if no jumping occurs, directly returning to the step two.
8. The method for waking up from sleep of touch key as claimed in claim 7, wherein a first time threshold is set, in the second step, when the duration of the MCU entering the sleep state exceeds the first time threshold, the RTC starts to wake up, and continues to execute the third step.
9. The method for waking up from sleep of touch key as claimed in claim 7 or 8, wherein in the third step, the method for determining frequent false triggering is one of the following methods:
setting a second time threshold, and if the time interval of two continuous false triggers is less than the second time threshold, determining that frequent false triggers occur;
and setting a fixed time length and a time threshold, and if the number of false triggering exceeds the time threshold in the fixed time length, determining that frequent false triggering occurs.
10. The touch key sleep wake-up method according to claim 7 or 8, wherein in the first step, the initial value is a maximum value that the second reference voltage can adjust.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05236571A (en) * | 1992-02-18 | 1993-09-10 | Sony Corp | Cpu start circuit in remote controller |
| CN103825595A (en) * | 2014-03-14 | 2014-05-28 | 深圳市国显科技股份有限公司 | Method and circuit for awakening intelligent control system of household appliance |
| CN106469014A (en) * | 2015-08-17 | 2017-03-01 | 小米科技有限责任公司 | Terminal, fingerprint Identification sensor awakening method and device |
| US20200205078A1 (en) * | 2018-12-19 | 2020-06-25 | Silicon Laboratories Inc. | Low power wake on radio |
| CN215298209U (en) * | 2021-05-10 | 2021-12-24 | 北京集创北方科技股份有限公司 | Touch awakening detection circuit, fingerprint identification device, display panel and electronic equipment |
| CN114167971A (en) * | 2021-12-13 | 2022-03-11 | 南京苏美达智能技术有限公司 | Dormancy awakening circuit, automatic walking equipment and awakening method thereof |
-
2022
- 2022-10-26 CN CN202211316594.8A patent/CN115378418B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05236571A (en) * | 1992-02-18 | 1993-09-10 | Sony Corp | Cpu start circuit in remote controller |
| CN103825595A (en) * | 2014-03-14 | 2014-05-28 | 深圳市国显科技股份有限公司 | Method and circuit for awakening intelligent control system of household appliance |
| CN106469014A (en) * | 2015-08-17 | 2017-03-01 | 小米科技有限责任公司 | Terminal, fingerprint Identification sensor awakening method and device |
| US20200205078A1 (en) * | 2018-12-19 | 2020-06-25 | Silicon Laboratories Inc. | Low power wake on radio |
| CN215298209U (en) * | 2021-05-10 | 2021-12-24 | 北京集创北方科技股份有限公司 | Touch awakening detection circuit, fingerprint identification device, display panel and electronic equipment |
| CN114167971A (en) * | 2021-12-13 | 2022-03-11 | 南京苏美达智能技术有限公司 | Dormancy awakening circuit, automatic walking equipment and awakening method thereof |
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