Sensor circuit, microphone sensor and electronic cigarette

Abstract

The present disclosure provides a sensor circuit, a microphone sensor and an electronic cigarette. The sensor circuit includes a conversion circuit, a comparison circuit, a signal input interface, and a latch circuit. The first end of the conversion circuit is connected to the SWP interface of the microphone sensor, the second end of the conversion circuit is grounded, the first input end of the comparison circuit is connected to the first end of the conversion circuit, the second input end of the comparison circuit is connected to the signal input interface, the first input end of the latch circuit is connected to the output end of the comparison circuit, the second input end of the latch circuit is connected to the SWP interface, and the output end of the latch circuit is connected to the storage device of the microphone sensor; wherein the conversion circuit is used to output a first voltage signal according to a SWP signal transmitted by the SWP interface; the comparison circuit is used to compare the first voltage signal with a reference voltage signal to obtain a first comparison signal and output it to the latch circuit; the latch circuit is used to compare the first comparison signal with the SWP signal to obtain a digital electrical signal and output it to the storage device.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the field of sensor technology, and more specifically, to a sensor circuit, a microphone sensor, and an electronic cigarette. Background Art

[0002] In actual applications, electronic cigarettes use microphone sensors to sense whether the user has a smoking action. The most basic microphone sensor interface generally only has an output interface, a power interface, and a ground interface. However, with the diversification of electronic cigarette products, the requirements for microphone sensors are increasing. For example, during the assembly process of the electronic cigarette, the assembler needs to adjust the parameters of the storage device of the microphone sensor, such as adjusting the inhalation trigger threshold, changing the maximum time setting of the driving heating wire, etc. This requires adding a data communication protocol function and its pins to the microphone sensor to meet the needs of changing the microphone sensor settings.

[0003] The basic requirement of data communication protocol is the transmission of clock / frequency signal and data signal. Currently, the data communication methods used in the market are mostly SPI (Serial Peripheral Interface) or I2C (Inter-Integrated Circuit). However, the SPI interface requires 4 pins for the communication protocol package output pins, including 1-pin enable pin, 1-pin clock / frequency pin, and 2-pins data pin. At the same time, the I2C interface requires 2 pins, including 1-pin clock / frequency pin and 1-pin data pin. The more data communication output pins, the more IC or finished product package pins, which means the cost increases. In addition, the more pins, the more pins need to be reprocessed, which may also reduce the product yield. Summary of the invention

[0004] One purpose of the embodiments of the present disclosure is to provide a new technical solution for a sensor circuit.

[0005] According to a first aspect of an embodiment of the present disclosure, a sensor circuit is provided, the sensor circuit comprising a conversion circuit, a comparison circuit, a signal input interface, and a latch circuit.

[0006] The first end of the conversion circuit is connected to the SWP interface of the microphone sensor, the second end of the conversion circuit is grounded, the first input end of the comparison circuit is connected to the first end of the conversion circuit, the second input end of the comparison circuit is connected to the signal input interface, the first input end of the latch circuit is connected to the output end of the comparison circuit, the second input end of the latch circuit is connected to the SWP interface, and the output end of the latch circuit is connected to the storage device of the microphone sensor;

[0007] Wherein, the conversion circuit is used to output a first voltage signal according to the SWP signal transmitted by the SWP interface;

[0008] The comparison circuit is used to compare the first voltage signal with a reference voltage signal to obtain a first comparison signal and output it to the latch circuit;

[0009] The latch circuit is used for comparing the first comparison signal with the SWP signal to obtain a digital electrical signal and output it to the storage device.

[0010] Optionally, the latch circuit is used to sequentially output the digital electrical signals to the storage device.

[0011] Optionally, the latch circuit includes a first latch and a second latch,

[0012] A first input end of the first latch is connected to an output end of the comparison circuit, a second input end of the first latch is connected to the SWP interface, an output end of the first latch is connected to a first input end of the second latch, a second input end of the second latch is connected to the SWP interface, and an output end of the second latch is connected to the storage device;

[0013] The first latch is used to compare the first comparison signal with the falling edge of the SWP signal to obtain a second comparison signal and output it to the second latch;

[0014] The second latch is used for comparing the second comparison signal with the rising edge of the SWP signal to obtain the digital electrical signal and output it to the storage device.

[0015] Optionally, the sensor circuit further includes a current source connected between the SWP interface and the first end of the conversion circuit.

[0016] Optionally, the conversion circuit is a capacitor.

[0017] Optionally, the sensor circuit further includes a reset switch, a first end of the reset switch is connected to the SWP interface through the current source, and a second end of the reset switch is grounded.

[0018] According to a second aspect of an embodiment of the present disclosure, a microphone sensor is provided, comprising a microphone and a chip, wherein the microphone is connected to the chip, the chip comprises a storage device, a SWP interface and the sensor circuit as described in the first aspect above, wherein an input end of the sensor circuit is connected to the SWP interface, and an output end of the sensor circuit is connected to the storage device.

[0019] Optionally, the chip further includes a power interface, an output interface and a ground interface.

[0020] Optionally, the SWP interface and the output interface are the same interface.

[0021] According to a third aspect of an embodiment of the present disclosure, an electronic cigarette is provided, comprising a power supply, a switch circuit, an atomizer, and a microphone sensor as described in the first aspect above, wherein the power supply is connected to an input end of the switch circuit, an output end of the switch circuit is connected to the atomizer, and the microphone sensor is connected to a control end of the switch circuit.

[0022] One beneficial effect of the disclosed embodiment is that a SWP signal representing the parameter to be written is received through the SWP interface of the microphone sensor and transmitted to the sensor circuit, the conversion circuit obtains and outputs a first voltage signal to the comparison circuit according to the SWP signal, the comparison circuit compares the first voltage signal with the reference voltage signal, obtains a first comparison signal and outputs it to the latch circuit, the latch circuit compares the first comparison signal with the SWP signal, obtains a digital electrical signal representing the parameter to be written and inputs it into the storage device of the microphone sensor. With such a setting, it is possible to save the microphone sensor from adding more pins to increase data communication, save pin costs and improve product yield.

[0023] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0025] Figure 1 is a schematic structural diagram of a sensor circuit according to an embodiment of the present disclosure;

[0026] Figure 2 is a structural schematic diagram of a sensor circuit according to another embodiment of the present disclosure;

[0027] Figure 3 is a schematic diagram of signal output according to an example of the present disclosure;

[0028] Figure 4 is a signal output waveform diagram according to another example of the present disclosure;

[0029] Figure 5 is a schematic diagram of the structure of a microphone sensor according to an embodiment of the present disclosure;

[0030] Figure 6 Schematic diagram of the structure of an electronic cigarette according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0031] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the embodiments of the present disclosure.

[0032] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0033] The technologies, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but where appropriate, the technologies, methods and equipment should be considered as part of the specification.

[0034] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0035] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0036] <Sensor Circuit Embodiment>

[0037] Please refer to Figure 1 and Figure 2 , which is a circuit structure diagram of a sensor circuit provided in an embodiment of the present application, such as Figure 1 As shown, the sensor circuit 10 includes a conversion circuit 110, a signal input interface Verf, a comparison circuit 120, and a latch circuit 130. A first end of the conversion circuit 110 is connected to the SWP interface of the microphone sensor, a second end of the conversion circuit 110 is grounded, a first input end of the comparison circuit 120 is connected to the first end of the conversion circuit 110, a second input end of the comparison circuit 120 is connected to the signal input interface Verf, a first input end of the latch circuit 130 is connected to the output end of the comparison circuit 120, a second input end of the latch circuit 130 is connected to the SWP interface of the microphone sensor, and an output end of the latch circuit 130 is connected to the storage device of the microphone sensor.

[0038] The Single Wire Protocol (SWP) interface of the microphone sensor adopts a single bus communication protocol, using only a single signal line, which can transmit both clock / frequency signals and data information signals, and the data transmission is bidirectional, which has many advantages such as saving I / O pin resources, simple structure, and low cost. The SWP signal representing the parameters to be written transmitted by the host computer can be received through the SWP interface of the microphone sensor.

[0039] Reference Figure 3 In the SWP signal shown, the host computer transmits m data in 1 cycle time, which can be divided into D1 to Dm, where m can be 8-bits or 16-bits data, which is the parameter to be written. On-duty is divided into On-duty1 and On-duty2, and (On-duty2) / (On-duty1)≥n, where n is a natural number or an integer greater than 1, and n can usually be 3. Among them, On-duty1 is a clock / frequency signal, and the detection method of the clock / frequency signal can be that there is a cycle of On-duty1 within a fixed period Period T. Among them, the judgment of whether the transmitted data Data is "0" or Data is "1" is the output of the sensor circuit of the embodiment of the present application. For example, the signal of the single-wire connection protocol SWPOn-duty1 can be judged as a digital signal of "0", and the signal of On-duty2 can be judged as a digital signal of "1". That is to say, through the sensor circuit of the embodiment of the present application, the data transmitted through the single-wire connection protocol SWP can be decoded into a digital signal.

[0040] In this embodiment, the microphone sensor further includes a power interface VCC, an output interface OUT, and a ground interface GND.

[0041] In one example, a SWP interface may be added to the microphone sensor product, and the SWP interface is used exclusively for data communication. For example, the microphone sensor product in the prior art has 3-pins, namely, a power interface VCC, an output interface OUT, and a ground interface GND. The microphone sensor product in the embodiment of the present application has 4-pins, namely, a power interface VCC, an output interface OUT, a ground interface GND, and a data communication interface SWP.

[0042] In one example, the SWP interface and the output interface OUT are the same interface, that is, the SWP interface and the output interface OUT are shared, that is, the number of pins of the microphone sensor remains unchanged, and the product itself has an additional data communication function.

[0043] The conversion circuit 110 is used to output a first voltage signal according to the SWP signal received by the SWP interface 110. Figure 2 , the conversion circuit 130 can be a capacitor.

[0044] In this embodiment, the sensor circuit 10 further includes a current source 140, which is connected between the SWP interface and the first end of the conversion circuit 110. Here, the current source Iswp can be controlled based on the SWP signal to charge the conversion circuit 110, thereby obtaining a first voltage signal Vc and outputting it to the comparison circuit 120. The obtained first voltage signal is referred to Figure 4 The Vc signal is shown.

[0045] The first input terminal of the comparison circuit 120 is used to receive the first voltage signal output by the conversion circuit 110, and the second input terminal of the comparison circuit 120 is used to receive the reference voltage signal input by the signal input terminal Vref. The embodiment of the present application does not limit the method of providing the reference voltage signal. The comparison circuit 120 has the following characteristics: when the voltage at the first input terminal of the comparison circuit 120 is greater than the voltage at its second input terminal, the comparison circuit 120 outputs a logic high level; when the voltage at the first input terminal of the comparison circuit 120 is less than the voltage at its second input terminal, the comparison circuit 120 outputs a logic low level. The comparison circuit 120 is used to compare the first voltage signal with the reference voltage signal to obtain a first comparison signal and output it to the latch circuit 150. The obtained first comparison signal is referenced Figure 4 The CMP-OUT signal is shown.

[0046] The latch circuit 130 is used to compare the first comparison signal with the SWP signal to obtain a digital electrical signal and output it to the storage device. In a specific implementation, the comparison circuit 140 is used to output the digital electrical signal to the storage device in sequence.

[0047] In this embodiment, refer to Figure 2 The latch circuit 130 includes a first latch 131 and a second latch 132. A first input end of the first latch 131 is connected to an output end of the comparison circuit 120, a second input end of the first latch 131 is connected to a SWP interface, an output end of the first latch 131 is connected to a first input end of the second latch 132, a second input end of the second latch 132 is connected to the SWP interface, and an output end of the second latch 132 is connected to a storage device.

[0048] The first latch 131 is used to compare the first comparison signal with the falling edge of the SWP signal to obtain a second comparison signal and output it to the second latch 132. The obtained second comparison signal refers to Figure 4 L-Out signal shown.

[0049] The second latch 132 is used to compare the second comparison signal with the rising edge of the SWP signal to obtain a digital electrical signal and output it to the storage device. The obtained digital electrical signal refers to Figure 4 The D-Out signal is shown.

[0050] In order to reduce the cost of the microphone sensor and reduce the area of ​​the microphone sensor, the interface of the microphone sensor generally includes a power interface, an output interface, and a ground interface. However, during the assembly process of the electronic cigarette machine, the assemblers often need to adjust the parameters of the storage device of the microphone sensor, such as adjusting the inhalation trigger threshold of the microphone sensor, adjusting the polarity value of the trigger signal of the microphone sensor, changing the maximum time setting of the driving heating wire, etc., and under the limitation of the microphone sensor interface, the assemblers cannot adjust the parameters of the storage device of the microphone sensor. In the embodiment of the present application, in order to realize the data communication function to adjust the parameters of the storage device of the microphone sensor, a SWP interface is added to the microphone sensor. Compared with the I2C interface and the SPI interface, the SWP only uses a single signal line. The microphone sensor includes two parts, a microphone and a chip, and the chip is a detection chip of the microphone sensor. In this embodiment, a sensor circuit is set inside the detection chip, and the sensor circuit is used to achieve the purpose of writing parameters to the storage device of the microphone sensor.

[0051] Specifically, refer to Figure 2 and Figure 4When it is necessary to write parameters to the storage device inside the microphone sensor, the SWP signal representing the parameters to be written transmitted by the host computer can be received through the SWP interface of the microphone sensor. The SWP signal includes not only clock / frequency information, but also parameter information to be written. The current source Iswp is controlled by the SWP signal to charge the capacitor to obtain a first voltage signal Vc and output it to the comparison circuit. The comparison circuit compares the first voltage signal Vc with the reference voltage signal Vref to output a first comparison signal CMP-Out. For example, when the first voltage signal Vc is greater than the reference voltage signal Vref, a logic high level is output, and when the first voltage signal Vc is less than the reference voltage signal Vref, a logic low level is output. The first comparison signal is compared with the falling edge of the SWP signal through the first latch Latch1 to obtain a second comparison signal L-Out. The second comparison signal L-Out is compared with the rising edge of the SWP signal through the second latch Latch2 to obtain a digital electrical signal D-out, and this digital electrical signal D-out is the decoded parameter to be written. For example, after being restored to 010, the digital electrical signal is written into the storage device one by one in chronological order, thus completing the purpose of modifying the parameters of the storage device of the microphone sensor. In other words, the embodiment of the present application proposes an analog single-wire connection protocol SWP decoding circuit, which can save the microphone sensor from adding more pins to increase data communication, thereby saving pin costs and improving product yield.

[0052] According to the embodiment of the present application, the SWP signal representing the parameter to be written is received through the SWP interface of the microphone sensor and transmitted to the sensor circuit, the conversion circuit obtains and outputs the first voltage signal to the comparison circuit according to the SWP signal, the comparison circuit compares the first voltage signal with the reference voltage signal, obtains the first comparison signal and outputs it to the latch circuit, the latch circuit compares the first comparison signal with the SWP signal, obtains the digital electrical signal representing the parameter to be written and inputs it into the storage device of the microphone sensor. With such a setting, the microphone sensor can save more pins to increase data communication, save pin costs and improve product yield.

[0053] In one embodiment, referring to Figure 2 The comparison circuit 130 is a comparator CMP, a non-inverting input terminal of the comparator CMP is connected to the output terminal of the conversion circuit 110, an inverting input terminal of the comparator CMP is connected to the signal input terminal Vref, and an output terminal of the comparator CMP is connected to the input terminal of the conversion circuit 110.

[0054] The comparator CMP has the following characteristics: when the voltage at the positive input terminal of the comparator CMP is greater than the voltage at its inverting input terminal, the comparator CMP outputs a logic high level; when the voltage at the positive input terminal of the comparator CMP is less than the reference voltage at its inverting input terminal, the comparator CMP outputs a logic low level. When the positive input terminal of the comparator CMP receives a first voltage signal, the comparator CMP generates a logic high level by using the above characteristics of the comparator CMP. Figure 4 The pulse signal CMP-Out shown is, for example, a square wave.

[0055] In one embodiment, referring to Figure 2 The sensor circuit 10 further includes a reset switch 150, a first end of the reset switch 150 is connected to the SWP interface via the current source 140, and a second end of the reset switch 150 is grounded. The reset switch 150 is used to reset the sensor circuit 10. For example, when the reset switch 150 is in an off state, the parameters to be written can be written into the storage device based on the sensor circuit provided in the embodiment of the present application, that is, the data communication function is realized.

[0056] <Microphone sensor embodiment>

[0057] Figure 5 A schematic diagram of the circuit structure of a microphone sensor according to an embodiment. Figure 5 As shown, the microphone sensor 50 includes a microphone 51 and a chip 52, the microphone 51 is connected to the chip 52, the chip 52 includes a storage device, a SWP interface, and a sensor circuit, and the sensor circuit can be the sensor circuit 10 provided in the above embodiment, the input end of the sensor circuit 10 is connected to the SWP interface, and the output end of the sensor circuit 10 is connected to the storage device.

[0058] The microphone 51 is used to receive the user's inhalation volume and transmit it to the chip 52, and the chip 52 is used to perform corresponding operations according to the received inhalation volume. Among them, the storage device is a random access memory, and the storage device is set to a random access memory. If the parameters of the storage device need to be modified, the data of the storage device can be cleared by powering off, and the new parameters can be written into the storage device through the sensor circuit, so that the modification of the parameters of the storage device is simpler and more convenient. The detailed structure of the sensor circuit can refer to the above embodiment and will not be repeated here; it can be understood that since the above sensor circuit is used in the microphone sensor of the embodiment of the present application, the embodiment of the microphone sensor of the embodiment of the present application includes all the technical solutions of all the embodiments of the above sensor circuit, and the technical effects achieved are also exactly the same. That is, the SWP signal representing the parameter to be written is received through the SWP interface of the microphone sensor and transmitted to the sensor circuit, the conversion circuit obtains and outputs the first voltage signal to the comparison circuit according to the SWP signal, the comparison circuit compares the first voltage signal with the reference voltage signal, obtains the first comparison signal and outputs it to the latch circuit, the latch circuit compares the first comparison signal with the SWP signal, obtains the digital electrical signal representing the parameter to be written and inputs it into the storage device of the microphone sensor. Such a setting can save the microphone sensor from adding more pins to increase data communication, save pin costs and improve product yield.

[0059] <Electronic Cigarette Example>

[0060] Figure 6 FIG. 1 is a schematic diagram of the structure of an electronic cigarette according to an embodiment. Figure 6 As shown, the electronic cigarette includes a power supply 610, a switch circuit 620, an atomizer 630 and a microphone sensor 640, and the microphone sensor can be the microphone sensor 50 described in the above embodiment. The power supply 610 is connected to the input end of the switch circuit 620, the output end of the switch circuit 620 is connected to the atomizer 630, and the microphone sensor 640 is connected to the control end of the switch circuit 620.

[0061] In specific implementation, the working principle of the electronic cigarette is as follows: the microphone of the microphone sensor receives the user's inhalation volume and transmits the user's inhalation volume to the chip. The chip compares the received inhalation volume with the inhalation volume threshold pre-written in the storage device. If the received inhalation volume is greater than the inhalation volume threshold pre-written in the storage device, the chip outputs a control signal to the switch circuit to control the switch circuit to conduct, so that the power supply supplies power to the atomizer. The detailed structure of the microphone sensor can refer to the above embodiment, which will not be repeated here; it can be understood that since the above microphone sensor is used in the electronic cigarette of the embodiment of the present application, the embodiment of the electronic cigarette of the embodiment of the present application includes all the technical solutions of all the embodiments of the above microphone sensor, and the technical effects achieved are also exactly the same. That is, the SWP signal representing the parameter to be written is received through the SWP interface of the microphone sensor and transmitted to the sensor circuit, the conversion circuit obtains and outputs the first voltage signal to the comparison circuit according to the SWP signal, the comparison circuit compares the first voltage signal with the reference voltage signal, obtains the first comparison signal and outputs it to the latch circuit, the latch circuit compares the first comparison signal with the SWP signal, obtains the digital electrical signal representing the parameter to be written and inputs it into the storage device of the microphone sensor. Such a setting can save the microphone sensor from adding more pins to increase data communication, save pin costs and improve product yield.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0063] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A sensor circuit, characterized in that: The sensor circuit includes a conversion circuit, a comparison circuit, a signal input interface, and a latch circuit. The first end of the conversion circuit is connected to the SWP interface of the microphone sensor, the second end of the conversion circuit is grounded, the first input end of the comparison circuit is connected to the first end of the conversion circuit, the second input end of the comparison circuit is connected to the signal input interface, the first input end of the latch circuit is connected to the output end of the comparison circuit, the second input end of the latch circuit is connected to the SWP interface, and the output end of the latch circuit is connected to the storage device of the microphone sensor; Wherein, the conversion circuit is used to output a first voltage signal according to the SWP signal transmitted by the SWP interface; The comparison circuit is used to compare the first voltage signal with a reference voltage signal to obtain a first comparison signal and output it to the latch circuit; The latch circuit is used to compare the first comparison signal with the SWP signal to obtain a digital electrical signal and output it to the storage device; Wherein, the latch circuit includes a first latch and a second latch, A first input end of the first latch is connected to an output end of the comparison circuit, a second input end of the first latch is connected to the SWP interface, an output end of the first latch is connected to a first input end of the second latch, a second input end of the second latch is connected to the SWP interface, and an output end of the second latch is connected to the storage device; The first latch is used to compare the first comparison signal with the falling edge of the SWP signal to obtain a second comparison signal and output it to the second latch; The second latch is used for comparing the second comparison signal with the rising edge of the SWP signal to obtain the digital electrical signal and output it to the storage device.

2. The sensor circuit according to claim 1, characterized in that: The latch circuit is used to sequentially output the digital electrical signals to the storage device.

3. The sensor circuit according to claim 1, characterized in that: The sensor circuit further includes a current source connected between the SWP interface and a first terminal of the conversion circuit.

4. The sensor circuit according to claim 1, characterized in that: The conversion circuit is a capacitor.

5. The sensor circuit according to claim 3, characterized in that: The sensor circuit further comprises a reset switch, a first end of the reset switch is connected to the SWP interface via the current source, and a second end of the reset switch is grounded.

6. A microphone sensor, characterized in that: The microphone sensor includes a microphone and a chip, the microphone is connected to the chip, the chip includes a storage device, a SWP interface and a sensor circuit according to any one of claims 1 to 5, the input end of the sensor circuit is connected to the SWP interface, and the output end of the sensor circuit is connected to the storage device.

7. The microphone sensor according to claim 6, characterized in that: The chip also includes a power interface, an output interface and a ground interface.

8. The microphone sensor according to claim 7, characterized in that: The SWP interface and the output interface are the same interface.

9. An electronic cigarette, characterized in that: The electronic cigarette comprises a power supply, a switch circuit, an atomizer and a microphone sensor as described in any one of claims 6 to 8, wherein the power supply is connected to an input end of the switch circuit, an output end of the switch circuit is connected to the atomizer, and the microphone sensor is connected to a control end of the switch circuit.

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