CN115597705A - Active light-emitting type optical sensing chip and control method thereof - Google Patents
Active light-emitting type optical sensing chip and control method thereof Download PDFInfo
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Abstract
The invention discloses an active light-emitting type light sensing chip and a control method thereof, wherein the light sensing chip comprises a light receiving element, a light emitting element, a driving circuit and a data processing and controlling module, and the data processing and controlling module comprises an analog-to-digital converter, a time sequence control unit and an output control unit; the light emitting element is connected with a driving circuit, the driving circuit is connected with an output control unit, the analog-to-digital converter is connected with the light receiving element and the output control unit, and the time sequence control unit is connected with the analog-to-digital converter and the driving circuit; the time sequence control unit is used for controlling the time sequences of the analog-digital converter and the driving circuit; the light receiving element is used for receiving an external light signal and converting the external light signal into an analog electric signal; the output control unit is used for controlling the magnitude of the electric signal of the driving circuit; and the driving circuit is used for driving the light emitting element to emit a light signal to the outside. The implementation of the invention can improve the detection accuracy of the active light-emitting type optical sensing chip and reduce the power consumption of the chip, and can be widely applied to the technical field of sensors.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to an active light-emitting type optical sensing chip and a control method thereof.
Background
A light sensor generally refers to a device that senses light energy sharply and converts the light energy into an electrical signal. Light sensors can be divided into two broad categories: one type is that the optical sensor does not actively emit light outwards, and only passively receives a specific optical signal of the external environment; one is an active light emitting type optical sensor that can actively emit an optical signal of a specific wavelength/frequency outward and receive and detect the optical signal of the specific wavelength/frequency. The active light-emitting optical sensor is more flexible due to the capability of autonomously controlling the wavelength/frequency of the detected optical signal, and is widely applied to the fields of intelligent wearing, intelligent lighting systems and the like.
With the development of integrated circuit technology, the light sensor is usually fabricated as a miniature integrated chip, i.e. a light sensing chip. Since the light receiving element of the light sensing chip needs to receive external light, it is exposed to the external environment, and various noise light signals in the external environment may have adverse effects on the detection of the light sensing chip, such as large power consumption or low accuracy of the detection result.
Disclosure of Invention
In view of this, an object of the embodiments of the present invention is to provide an active light emitting type photo sensor chip and a control method thereof, which can improve the detection accuracy of the active light emitting type photo sensor chip and reduce the chip power consumption.
In a first aspect, an embodiment of the present invention provides an active light emitting type optical sensing chip, including a light receiving element, a light emitting element, a driving circuit, a data processing and controlling module, a power module, and a communication module, where the data processing and controlling module includes an analog-to-digital converter, a timing control unit, and an output control unit; the light emitting element is connected with the driving circuit, the driving circuit is connected with the output control unit, the analog-to-digital converter is connected with the light receiving element and the output control unit, the time sequence control unit is connected with the analog-to-digital converter and the driving circuit, and the communication module is connected with the data processing and control module;
the time sequence control unit is used for controlling the time sequences of the analog-digital converter and the driving circuit;
the light receiving element is used for receiving an external light signal and converting the light signal into an analog electric signal;
the analog-to-digital converter is used for converting the analog electric signal into a digital electric signal;
the output control unit is used for controlling the magnitude of the electric signal of the driving circuit;
the driving circuit is used for driving the light emitting element to emit a light signal to the outside;
the communication module is used for communicating with other devices;
and the power supply module is used for supplying power to the optical sensing chip.
Optionally, the power supply module includes one or more of an overvoltage protection circuit, a power-on reset unit, or a reference voltage circuit.
In a second aspect, an embodiment of the present invention provides a method for controlling an active light-emitting optical sensor chip, which is applied to the optical sensor chip, and includes:
controlling the analog-to-digital converter to output a first digital signal at a first moment through a time sequence control unit;
determining the magnitude of an electric signal of a driving circuit according to the first digital signal;
controlling the driving circuit through a timing control unit and an output control unit to drive the light emitting element to emit a first optical signal between a first time and a second time according to the determined magnitude of the electric signal;
controlling the analog-to-digital converter to output a second digital signal at a second moment through a time sequence control unit;
a valid digital signal is determined from the second digital signal and the first digital signal.
Optionally, the determining the magnitude of the electric signal of the driving circuit according to the first digital signal specifically includes:
determining a corresponding relation between an output signal of the analog-to-digital converter and an electric signal of the driving circuit;
and determining the magnitude of the electric signal of the driving circuit according to the first digital signal and the corresponding relation.
Optionally, the corresponding relationship includes a preset data corresponding table, the data corresponding table records an electrical signal magnitude of an output signal segment of the analog-to-digital converter corresponding to the driving circuit, and the determining the electrical signal magnitude of the driving circuit according to the first digital signal and the corresponding relationship specifically includes:
determining the output signal section of the corresponding analog-to-digital converter according to the first digital signal;
and determining the magnitude of the electric signal of the corresponding driving circuit according to the output signal section of the analog-to-digital converter.
Optionally, the corresponding relationship includes a preset functional relationship, where the functional relationship represents a function of an electrical signal of the driving circuit with respect to an output signal of the analog-to-digital converter, and the determining the magnitude of the electrical signal of the driving circuit according to the first digital signal and the corresponding relationship specifically includes:
and calculating the magnitude of the electric signal of the driving circuit according to the first digital signal and the functional relation.
Optionally, the first time is determined by:
determining an integration time of the analog-to-digital converter;
and determining the first time according to the starting time and the integration time.
Optionally, the second time is determined by:
and determining the second time according to the first time and the integration time.
The implementation of the embodiment of the invention has the following beneficial effects: the optical sensing chip comprises a light receiving element, a light emitting element, a driving circuit and a data processing and controlling module, wherein the data processing and controlling module comprises an analog-to-digital converter, a time sequence control unit and an output control unit, the time sequence of the analog-to-digital converter and the time sequence of the driving circuit are controlled by the time sequence control unit, and the electric signal of the driving circuit is controlled by the output control unit so as to control the light emitting element to emit a light signal to the outside; the method comprises the steps of firstly detecting the signal size of the light receiving element under the condition that the emitting element is controlled not to emit light, then detecting the signal size of the light receiving element under the condition that the emitting element is controlled to emit light, then subtracting the signals of the light receiving element twice to remove the influence of an ambient light signal so as to improve the accuracy of a detection result, and meanwhile determining the driving electric signal size of the emitting element according to the signal size of the light receiving element detected under the condition that the emitting element is not emitted light so as to reduce the energy consumption of a chip.
Drawings
Fig. 1 is a schematic structural diagram of an active light-emitting optical sensor chip according to an embodiment of the present invention;
fig. 2 is a schematic flowchart illustrating steps of a method for controlling an active light-emitting optical sensor chip according to an embodiment of the present invention;
fig. 3 is a pulse current timing diagram of a driving circuit of a light emitting element according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments. For the step numbers in the following embodiments, they are set for convenience of illustration only, the order between the steps is not limited at all, and the execution order of each step in the embodiments can be adapted according to the understanding of those skilled in the art.
The working process of the light sensing chip is as follows: the light emitting element of the light sensing chip emits light signals (such as 940nm infrared light signals) outwards, after the light signals are reflected/refracted by an external obstacle, part of the light signals return to the chip and are received and detected by the light receiving element of the light sensing chip, and the data processing circuit module in the light sensing chip converts the light signals detected by the light receiving element into electric signals usable by a rear-end device.
The light receiving end of the light sensing chip is exposed to the environment, and not only receives and detects the light signal from the light emitting end of the light sensing chip (i.e. the part of the light signal sent by the light emitting end to the external environment and returned to the chip after being reflected/refracted by an external obstacle), but also receives and detects the noise light signal in the surrounding environment of the chip (the ambient light contains almost all the frequency/wavelength light signals, and the noise light signals in different environments have different intensities). Therefore, the optical signal intensity actually measured by the optical sensor chip is a superimposed signal of the target optical signal and the ambient optical signal, and the optical sensor chip cannot obtain a more accurate detection result without special processing.
The problem of the intensity of the optical signal emitted by the light emitting end of the optical sensing chip is as follows: if the intensity of the optical signal emitted from the light emitting end of the optical sensor chip is kept unchanged, when the intensity of the noise optical signal in the surrounding environment becomes large (comparable to or much larger than the intensity of the optical signal emitted from the light emitting end of the optical sensor chip), in the optical signal emitted from the light emitting end to the external environment, part of the optical signal returned to the chip after being reflected/refracted by an external obstacle is submerged by the noise optical signal in the environment, so that the optical signal received and detected by the light receiving end of the optical sensor chip is seriously distorted, and an effective result cannot be measured; when the intensity of the noise optical signal in the surrounding environment is reduced (much smaller than the intensity of the optical signal emitted by the light emitting end of the optical sensing chip), the optical signal received and detected by the light receiving end of the optical sensing chip has almost no noise optical signal component, and the measurement result is accurate, but the intensity of the optical signal emitted by the light emitting end of the optical sensing chip can be reduced (because the intensity of the noise optical signal in the environment is small, the accurate data can still be measured by properly reducing the intensity of the optical signal emitted by the light emitting end of the optical sensing chip), so as to reduce the power and reduce the power consumption of the chip.
Referring to fig. 1, an embodiment of the present invention provides an active light emitting type optical sensing chip, including a light receiving element, a light emitting element, a driving circuit, a data processing and controlling module, a power module, and a communication module, where the data processing and controlling module includes an analog-to-digital converter, a timing control unit, and an output control unit; the light emitting element is connected with the driving circuit, the driving circuit is connected with the output control unit, the analog-to-digital converter is connected with the light receiving element and the output control unit, the time sequence control unit is connected with the analog-to-digital converter and the driving circuit, and the communication module is connected with the data processing and control module;
the time sequence control unit is used for controlling the time sequences of the analog-digital converter and the driving circuit;
the light receiving element is used for receiving an external light signal and converting the light signal into an analog electric signal;
the analog-to-digital converter is used for converting the analog electric signal into a digital electric signal;
the output control unit is used for controlling the magnitude of the electric signal of the driving circuit;
the driving circuit is used for driving the light emitting element to emit a light signal to the outside;
the communication module is used for communicating with other devices;
and the power supply module is used for supplying power to the optical sensing chip.
It should be noted that the electrical signal of the driving circuit includes a current signal or a voltage signal,
specifically, the timing control unit is used for controlling the timing of the analog-to-digital converter and the driving circuit: after the analog-to-digital converter is used for converting the output data of the light receiving element, and the driving circuit is started to control the light emitting element to emit a light signal, the analog-to-digital converter is used for converting the output data of the light receiving element once again, and the data of the previous time is subtracted (including but not limited to using a digital subtracter) by the data of the next time so as to realize the elimination of the ambient light signal. The driving control unit is used for controlling the pulse current output to the light emitting element by the driving circuit, when the intensity data of the optical signal obtained by the conversion of the analog-to-digital converter is larger, the output current of the driving circuit is set to be large current, and when the intensity data of the optical signal obtained by the conversion of the analog-to-digital converter is smaller, the output current of the driving circuit is set to be small current, so that the ambient light signal is eliminated, and the power consumption of the chip is reduced.
Optionally, the power supply module includes one or more of an overvoltage protection circuit, a power-on reset unit, or a reference voltage circuit.
It should be noted that the power module includes, but is not limited to, one or more of an overvoltage protection circuit, a power-on reset unit, or a reference voltage circuit, and the power module may be deleted or added appropriately according to practical applications on this basis, and the embodiment is not limited in particular.
Specifically, referring to fig. 1, the light sensing chip has a light emitting element(s) and a light receiving element(s), and the light emitting terminal emits a light signal to the external environment of the chip under the current/voltage driving of the driving circuit. The light receiving element can receive or detect light signals from the external environment of the chip and convert the light signals into electric signals. The data processing and control module can calculate and process the electric signal data output by the light receiving element, for example, the analog electric signal output by the light receiving element is converted into a digital electric signal through a digital-to-analog converter, the output current/voltage of a driving circuit of the light emitting element is controlled, and other operation functions are provided; in addition, the data processing and control module also comprises a time sequence control unit which controls the time sequence of the analog-digital converter and the driving circuit. The power management module is used for supplying power to other circuit modules, wherein the overvoltage protection circuit can improve the stability and reliability of the circuit, and when the power supply voltage is too high, the power supply circuit is actively disconnected by using switching elements such as diodes, triodes and the like in the circuit; when the chip is powered on, the power-on reset unit can generate a reset signal, so that the whole optical sensing chip enters an initialization state; the VREF reference voltage circuit is used for generating a series of stable reference voltages, and when the power supply voltage fluctuates in a small amplitude, the reference voltages are kept unchanged so as to ensure that each circuit module of the light sensing chip works normally and stably. In addition, the optical sensing chip is provided with a communication module so as to perform operations such as data exchange with other devices.
The implementation of the embodiment of the invention has the following beneficial effects: the light sensing chip comprises a light receiving element, a light emitting element, a driving circuit and a data processing and controlling module, wherein the data processing and controlling module comprises an analog-to-digital converter, a time sequence control unit and an output control unit, the time sequence of the analog-to-digital converter and the driving circuit is controlled by the time sequence control unit, and the magnitude of an electric signal of the driving circuit is controlled by the output control unit so as to control the light emitting element to emit a light signal to the outside; the method comprises the steps of firstly detecting the signal size of the light receiving element under the condition that the emitting element is controlled not to emit light, then detecting the signal size of the light receiving element under the condition that the emitting element is controlled to emit light, then subtracting the signals of the light receiving element twice to remove the influence of an ambient light signal so as to improve the accuracy of a detection result, and meanwhile determining the driving electric signal size of the emitting element according to the signal size of the light receiving element detected under the condition that the emitting element is not emitted light so as to reduce the energy consumption of a chip.
Referring to fig. 2, an embodiment of the present invention provides a method for controlling an active light-emitting optical sensor chip, which is applied to the optical sensor chip, and includes steps S100 to S500:
s100, controlling the analog-to-digital converter to output a first digital signal at a first moment through a time sequence control unit.
Specifically, after the optical sensor chip is started, the driving circuit does not control the light emitting element to emit light to the outside, and the light receiving element receives a noise interference optical signal of the outside environment.
The first time represents the time when the data of the analog-to-digital converter completes the conversion of the noise interference optical signal of the external environment, and the first digital signal represents the intensity of the interference optical signal of the external environment.
Referring to FIG. 3, the driving circuit of the light emitting device provides a periodic pulse current t during operation 0 Is the starting point of a pulse period (e.g. 0 time when the chip is power-on reset); t is t 0 To t 1 At that time, the current is 0; t is t 1 To t 2 At the moment, the current is I 0 ；t 0 To t 2 Is one pulse period. Because the analog-to-digital converter needs a certain integration time when converting the signal transmitted by the light receiving element, the digital signal output after a certain time needs to be relatively accurate.
Optionally, the first time is determined by:
s110, determining the integration time of an analog-to-digital converter;
and S120, determining the first time according to the starting time and the integration time.
Specifically, the integration time of the analog-to-digital converter is determined by the chip design, and the integration time may be different for different chips, for example, the integration time of the analog-to-digital converter may be 20 μ sec. The difference between the first time and the starting time is larger than the integration time of the analog-to-digital converter. For example, referring to FIG. 3,t, the integration time, t, of an analog-to-digital converter is shown 0 Denotes the starting time, t 1 Indicates a first time, then t 1 -t 0 >t，t 1 -t 0 Can be adjusted according to practical application.
And S200, determining the magnitude of the electric signal of the driving circuit according to the first digital signal.
Specifically, the magnitude of the electric signal of the driving circuit is determined according to the intensity of the interference light signal representing the external environment of the first digital signal, and the electric signal of the driving circuit can be determined within a proper range, so that the light emitted to the outside by the light emitting element cannot be covered by the interference light of the external environment, and meanwhile, the intensity of the light signal emitted to the outside by the light emitting element cannot be too large, so that the power consumption of the chip is increased.
Optionally, the determining the magnitude of the electric signal of the driving circuit according to the first digital signal specifically includes:
s210, determining a corresponding relation between an output signal of the analog-to-digital converter and an electric signal of a driving circuit;
s220, determining the electric signal size of the driving circuit according to the first digital signal and the corresponding relation.
It should be noted that the corresponding relationship between the output signal of the analog-to-digital converter and the electrical signal of the driving circuit may include various different forms, which is determined according to practical applications, and the embodiment is not particularly limited. The size of the electric signal of one driving circuit can be uniquely determined according to the first digital signal and the corresponding relation.
Optionally, the corresponding relationship includes a preset data corresponding table, the data corresponding table records an electrical signal magnitude of an output signal segment of the analog-to-digital converter corresponding to the driving circuit, and the determining the electrical signal magnitude of the driving circuit according to the first digital signal and the corresponding relationship specifically includes:
S221A, determining an output signal section of the corresponding analog-to-digital converter according to the first digital signal;
S222A, determining the size of the electric signal of the corresponding driving circuit according to the output signal section of the analog-to-digital converter.
Specifically, for example, in the data mapping table, the signal segment output by the analog-to-digital converter is divided into N reference voltages, which are: v 1 /V 2 /V 3 /.../V N The value of N is determined according to the practical application requirement of the optical sensing chip, and the first digital signal output by the analog-to-digital converter at the first time is a. If A is more than 0 and less than or equal to V 1 Then the driving circuit outputs a pulse current of I 1 (ii) a If V 1 ＜A≤V 2 Then the driving circuit outputs a pulse current of I 2 And so on, if V N-1 ＜A≤V N Then the driving circuit outputs a pulse current of I N 。
V 1 /V 2 /V 3 /.../V N Calibration of the value of (c): the values of these reference voltages are calibrated in advance; the N value can be determined according to actual requirements, and if high-precision measurement is required, a larger number of shift stages (e.g., N = 128) can be set, but if the number of reference shift stages is too large, the chip area will be correspondingly larger, so that if the chip area is not excessively increased, an appropriate number of reference voltages (e.g., N = 32) can be set. V N The value of (c): the digital voltage converted by ADC in the case of the strongest illumination (for example, the indoor illumination is usually less than 500lx (lux) in the case of a light sensor applied indoors, so that the digital voltage measured when a 500lx light source irradiates the chip can be calibrated to be V N ). N and V determined according to the above N Is 0-V N Equally dividing into N parts to obtain reference voltage V 1 /V 2 /V 3 /.../V N-1 。
Optionally, the corresponding relationship includes a preset functional relationship, where the functional relationship represents a function of an electrical signal of the driving circuit with respect to an output signal of the analog-to-digital converter, and the determining the magnitude of the electrical signal of the driving circuit according to the first digital signal and the corresponding relationship specifically includes:
and S221B, calculating the electric signal size of the driving circuit according to the first digital signal and the functional relation.
It should be noted that the preset functional relation is determined according to practical applications, and the embodiment is not particularly limited.
Specifically, for example, the functional relation is y = ax + b, where y represents the electric signal of the driving circuit, x represents the first digital signal, and a and b are constants, and when the first digital signal x is determined, x is substituted into the formula y = ax + b to determine the electric signal y of the driving circuit.
And S300, controlling the driving circuit through the timing control unit and the output control unit to drive the light emitting element to emit a first optical signal between a first time and a second time according to the determined magnitude of the electric signal.
Specifically, the timing control unit and the output control unit control the light emitting elements simultaneously, the timing control unit controls the timing of the light emitting elements through the driving circuit, and the output control unit controls the magnitude of the electric signals of the light emitting elements through the driving circuit.
Optionally, the second time is determined by:
and S310, determining the second time according to the first time and the integration time.
Specifically, referring to fig. 3, the difference between the second time and the first time is greater than the integration time of the analog-to-digital converter. For example, t represents the integration time of the analog-to-digital converter, t 1 Denotes a first time, t 2 Indicates a second time, then t 2 -t 1 >t，t 2 -t 1 Can be adjusted correspondingly according to practical application.
And S400, controlling the analog-to-digital converter to output a second digital signal at a second moment through the time sequence control unit.
The second time represents the time when the analog-to-digital converter data completes the conversion of the mixed optical signal composed of the noise interference optical signal of the external environment and the target optical signal, the first digital signal represents the intensity of the interference optical signal of the external environment, and the second digital signal represents the mixed signal including the ambient noise interference optical signal and the target optical signal.
S500, determining a valid digital signal according to the second digital signal and the first digital signal.
Specifically, the result obtained by subtracting the first digital signal from the second digital signal is a valid digital signal, and the valid digital signal represents the magnitude of the target signal. If the second digital signal is B, the first digital signal is ase:Sub>A, and the valid digital signal is C, C = B-ase:Sub>A. The subtraction calculation may be implemented using software calculation or using a subtractor.
The implementation of the embodiment of the invention has the following beneficial effects: the light sensing chip comprises a light receiving element, a light emitting element, a driving circuit and a data processing and controlling module, wherein the data processing and controlling module comprises an analog-to-digital converter, a time sequence control unit and an output control unit, the time sequence of the analog-to-digital converter and the driving circuit is controlled by the time sequence control unit, and the magnitude of an electric signal of the driving circuit is controlled by the output control unit so as to control the light emitting element to emit a light signal to the outside; the method comprises the steps of firstly detecting the signal size of the light receiving element under the condition that the emitting element is controlled not to emit light, then detecting the signal size of the light receiving element under the condition that the emitting element is controlled to emit light, then subtracting the signals of the light receiving element twice to remove the influence of an ambient light signal so as to improve the accuracy of a detection result, and meanwhile determining the driving electric signal size of the emitting element according to the signal size of the light receiving element detected under the condition that the emitting element is not emitted light so as to reduce the energy consumption of a chip.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. An active light-emitting type light sensing chip is characterized by comprising a light receiving element, a light emitting element, a driving circuit, a data processing and control module, a power module and a communication module, wherein the data processing and control module comprises an analog-to-digital converter, a time sequence control unit and an output control unit; the light emitting element is connected with the driving circuit, the driving circuit is connected with the output control unit, the analog-to-digital converter is connected with the light receiving element and the output control unit, the time sequence control unit is connected with the analog-to-digital converter and the driving circuit, and the communication module is connected with the data processing and control module;
the time sequence control unit is used for controlling the time sequences of the analog-digital converter and the driving circuit;
the light receiving element is used for receiving an external light signal and converting the light signal into an analog electric signal;
the analog-to-digital converter is used for converting the analog electric signal into a digital electric signal;
the output control unit is used for controlling the electric signal of the driving circuit;
the driving circuit is used for driving the light emitting element to emit a light signal to the outside;
the communication module is used for communicating with other devices;
and the power supply module is used for supplying power to the optical sensing chip.
2. The light sensor chip of claim 1, wherein the power module comprises one or more of an over-voltage protection circuit, a power-on-reset unit, or a reference voltage circuit.
3. A method for controlling an active light-emitting type photo-sensor chip, which is applied to the photo-sensor chip of claim 1, comprising:
controlling the analog-to-digital converter to output a first digital signal at a first moment through a time sequence control unit;
determining the magnitude of an electric signal of a driving circuit according to the first digital signal;
controlling the driving circuit through a timing control unit and an output control unit to drive the light emitting element to emit a first optical signal between a first time and a second time according to the determined magnitude of the electric signal;
controlling the analog-to-digital converter to output a second digital signal at a second moment through a time sequence control unit;
a valid digital signal is determined from the second digital signal and the first digital signal.
4. The control method according to claim 3, wherein the determining the magnitude of the electric signal of the driving circuit according to the first digital signal specifically comprises:
determining a corresponding relation between an output signal of the analog-to-digital converter and an electric signal of the driving circuit;
and determining the magnitude of the electric signal of the driving circuit according to the first digital signal and the corresponding relation.
5. The control method according to claim 4, wherein the correspondence relationship includes a preset data correspondence table, the data correspondence table records a magnitude of an electrical signal of the driving circuit corresponding to an output signal segment of the analog-to-digital converter, and the determining the magnitude of the electrical signal of the driving circuit according to the first digital signal and the correspondence relationship specifically includes:
determining the output signal section of the corresponding analog-to-digital converter according to the first digital signal;
and determining the magnitude of the electric signal of the corresponding driving circuit according to the output signal section of the analog-to-digital converter.
6. The control method according to claim 4, wherein the correspondence includes a preset functional relation, the functional relation represents a function of the electrical signal of the driving circuit with respect to the output signal of the analog-to-digital converter, and the determining the magnitude of the electrical signal of the driving circuit according to the first digital signal and the correspondence includes:
and calculating the magnitude of the electric signal of the driving circuit according to the first digital signal and the functional relation.
7. The control method according to claim 3, characterized in that the first moment is determined by:
determining an integration time of the analog-to-digital converter;
and determining the first time according to the starting time and the integration time.
8. The control method according to claim 7, characterized in that the second time is determined by:
and determining the second time according to the first time and the integration time.
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| CN202211070586.XA Pending CN115597705A (en) | 2022-09-02 | 2022-09-02 | Active light-emitting type optical sensing chip and control method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN115597705A (en) |
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2022
- 2022-09-02 CN CN202211070586.XA patent/CN115597705A/en active Pending
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