KR101994165B1 - Nfc salinity sensing module including salinity sensor - Google Patents

Abstract

An embodiment of the present invention provides an NFC salinity sensing module, comprising: a first substrate including a top surface on which a sensing electrode and a ground electrode area are disposed, and a bottom surface on which an IC chip connected to the sensing electrode and ground electrode, and a first antenna electrode and a second antenna electrode connected to the IC chip are disposed; a second substrate including a first hole; a first layer arranged under the second substrate and forming an antenna and a recess having a structure of being connected to the first antenna electrode and the second antenna electrode; and a transparent film including a second hole and arranged on the second substrate, wherein the bottom surface of the first substrate is inserted into the recess through the first hole and the second hole. According to the present invention, the IC chip includes: a sensor driver circuit transmitting an analog driving signal to the sensing electrode through a pin of the IC chip; and an analog to digital converter circuit, if an impedance between the sensing electrode and ground electrode changes as a sensing target liquid touches the sensing electrode and ground electrode, receiving an analog sensing signal generated according to a change in the impedance through the pin to convert the analog sensing signal into a digital signal, wherein the ground electrode is electrically separated from the sensing electrode, and the ground electrode completely encompasses the sensing electrode. The present invention can correctly measure the salinity of the sensing target liquid.

Description

TECHNICAL FIELD [0001] The present invention relates to an NFC salinity detection module including a salinity sensor,

An embodiment according to the concept of the present invention relates to a salinity measurement device, and more particularly to an NFC salinity detection module including a salinity sensor without a battery.

Salt is used to match the liver of food. Salt of sodium is introduced into the human body through food, and the salt is one of the causes of hypertension which is an adult disease. Salt also affects myocardial infarction and stroke. Therefore, it is necessary to control the salinity of the moving object by measuring the salinity contained in the food.

1. Registration patent publication 10-1575748 (December, 2015) 2. Published Japanese Patent Application No. 10-2014-0063404 (Feb.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a driving signal generator and a driving method thereof, capable of enabling any one of a plurality of driving signal generators and a plurality of analog- The present invention provides an NFC salinity detection module that can accurately measure salinity of a liquid to be detected sensed by the salinity sensor by using an enabled analog-to-digital converter.

The NFC salinity sensing module according to an embodiment of the present invention includes an upper surface having a sensing electrode and a ground electrode, an IC chip connected to the sensing electrode and the ground electrode, a first antenna electrode and a second antenna electrode connected to the IC chip, A first substrate including a bottom surface disposed therein; A second substrate including a first hole; An antenna disposed below the second substrate and having a structure connected to the first antenna electrode and the second antenna electrode; And a transparent film disposed on the second substrate and including a second hole, wherein the bottom surface of the first substrate is inserted into the groove through the first hole and the second hole, A sensor driver circuit for transmitting an analog driving signal to the sensing electrode through a pin of the IC chip; And an analog sense signal generated according to a change of the impedance when the sensing target liquid contacts the sensing electrode and the ground electrode and changes the impedance between the sensing electrode and the ground electrode, Wherein the ground electrode is electrically separated from the sensing electrode, and the ground electrode fully surrounds the sensing electrode. The NFC salinity sensing module includes a driver controller, and the sensor driver circuit includes: a square wave generator for generating a square wave; Impedance matching resistors formed between the output terminal of the square wave generator and the pin; A current generator coupled to the pin; A voltage generator coupled to the pin; And a signal generator coupled to the pin, wherein the driver controller enables only one of the square wave generator, the current generator, the voltage generator, and the signal generator to generate the analog drive signal, And the square wave corresponding to the analog driving signal generated from the square wave generator is supplied to the pin through the selected impedance matching resistor when one of the impedance matching resistors is selected by the driver controller.

Wherein a diameter of the sensing electrode is 1.7 mm ± 0.1 mm, a gap between the ground electrode and the sensing electrode is 1.2 mm ± 0.1 mm, a width of the circular portion of the ground electrode is 1.2 mm ± 0.1 mm, The ratio of the area of the ground electrode to the area is 10 to 16.

The NFC salinity sensing module according to an embodiment of the present invention can enable any one of a plurality of driving signal generators and a plurality of analog-to-digital converters according to the characteristics or type of the salinity sensor, The salinity of the liquid to be detected sensed by the salinity sensor can be accurately measured by using the generator and the enabled analog-to-digital converter.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to more fully understand the drawings recited in the detailed description of the present invention, a detailed description of each drawing is provided.
1 shows a block diagram of a salinity measurement system according to an embodiment of the present invention.
2 shows a block diagram of the non-power NFC salinity sensing module shown in FIG.
FIG. 3 shows a configuration diagram of the non-power NFC salinity detection module shown in FIG. 1. FIG.
4A shows electrodes disposed on the top surface of the first substrate shown in FIG.
FIG. 4B shows a non-powered NFC salinity sensing IC and antenna electrodes in which the first substrate shown in FIG. 3 is disposed on the bottom surface.
FIG. 5 shows the structure of electrodes disposed on the upper surface of the first substrate shown in FIG.
FIG. 6 is a flowchart illustrating an operation method of the salinity measurement system shown in FIG. 1. FIG.
7 is a conceptual diagram illustrating a method of operating a mobile app according to an embodiment of the present invention.

(E.g., non-powered NFC salinity sensing module 300 or non-powered NFC salinity sensing IC 330) does not include a power source such as a battery therein, but rather an external power source (e.g., Generates a required operating voltage at the non-powered device using a radio frequency (RF) signal (e.g., a near field communication (NFC) signal) transmitted from the mobile device 200, Means an external power source and a device capable of receiving and receiving.

1 shows a block diagram of a salinity measurement system according to an embodiment of the present invention. Referring to FIG. 1, the salinity measurement system 100 includes a mobile device 200 and a non-powered sensor (or a non-powered NFC salinity sensing module 300).

The mobile device 200 may be a smart phone, Internet of Things (IoT) device, or Information & Communication Technology (ICT) device capable of supplying wireless power to the wireless sensor 300, Module 210 and processor 220 and processor 220 executes a mobile application program (simply mobile application 230). The NFC module 210 transmits a first radio frequency signal to the non-power source sensor 300 and a signal corresponding to the second RF signal RF2 transmitted from the non-power source sensor 300, To the mobile application (230).

The non-powered sensor 300 may refer to an ICT communication and sensing platform and generates a voltage (or voltages) necessary for the operation of the non-powered sensor 300 using the first RF signal RF1. The non-powered sensor 300 includes an antenna 310, connection terminals 315 and 320, a capacitor CAP, a non-powered NFC salinity sensing IC (or a non-powered NFC salient sensing IC chip 330), fins 380 and 385, And a salinity sensor 390. The non-powered sensor 300 may perform the function of a passive NFC tag that does not include a battery therein.

2 shows a block diagram of the non-power NFC salinity sensing module shown in FIG. 1 and 2, the antenna 310 may receive the first RF signal RF1 and may transmit the second RF signal RF2.

The non-powered NFC salinity sensing IC 330 includes an RF interface 332, a power management unit 340, a microcontrol unit (MCU) 342, a driver controller 350, a sensor driver circuit 352 Analog-to-digital converter circuitry 370, and pins (pads or ports) 380 and 385. The MCU 342 may be a microcontroller.

The RF interface (or RF interface circuit) 332 may utilize (e.g., rectify) the first RF signal RF1 to provide a voltage required for operation of each of the components 332, 340, 342, 350, 352, and / Generates data necessary for operation of the non-power NFC salient sensing IC 330 by demodulating the first RF signal RF1 and modulates data to be transmitted to the mobile device 200 to generate a second RF signal RF2 can do.

The RF interface 332 may include a rectifier 334, a modulator / demodulator 336, and a power on reset (POR) / clock extractor 338.

The rectifier 334 rectifies the first RF signal RF1 to generate operating voltages and the modulator / demodulator 336 demodulates the first RF signal RF1 to generate first data contained in the first RF signal RF1 (Or extracts) the second data and generates a second RF signal RF2 corresponding to the second data by modulating the second data to be transmitted to the mobile device 200. [

The POR / clock extractor 338 performs a POR function in response to the reception of the first RF signal RF1 and extracts (or generates) the clock signal from the frequency of the first RF signal RF1. The clock signal (or the clock signal generated based on the clock signal) is clocked by the operation of the components (e.g., MCU 342, 358, 360, and / or 370) included in the non-powered NFC salt sense IC 330 It can be used as a clock.

The power management unit 340 can control the operating voltages generated by the rectifier 334 and supply the operating voltages to the components 332, 342, 350, 352, and / or 370 .

The MCU 342 can execute the firmware F / W contained therein and the firmware F / W can generate the first control signal CTR1 and the second control signal CTR2 according to the type (or characteristic) 2 control signal CTR2. The firmware F / W uses the first control signal CTR1 and the second control signal CTR2 using data stored in an accessible nonvolatile memory device (e.g., data indicative of the type or characteristic of the salinity sensor 390) Or control the generation timing of each of the control signals CTR1 and CTR2.

The first control signal CTR1 is used to enable (e.g., enable and disable) the operations of the components 354, 356, 358, 360, and 362 included in the sensor driver circuit 352, And the control signals supplied to the driver controller 350 that can control the control signals.

The second control signal CTR2 collectively refers to control signals that can control the operations (e.g., enable and disable) of the components 372 and 374 included in the analog-to-digital converter circuit 370.

Enabling (or activating) means that the component is activated (e.g., the operating voltage is supplied to that component), and disable (or deactivating) means that the component is not activated Which means that the operating voltage is not supplied).

The sensor driver circuit 352 includes impedance matching resistors 356 formed between the output terminal of the square wave generator 354 and the square wave generator 354 and the pin (or bidirectional signal transmission pin) 380 having a structure for generating a square wave, A current generator 358 coupled to pin 380, a voltage generator 360 coupled to pin 380, and a signal generator 362 coupled to pin 380.

In accordance with the first control signal CTR1, the driver controller 350 may operate to enable either one of the generators 354,358, 360, and 362 and to perform impedance matching when the square wave generator 354 is enabled And selects one of the resistors 356. Each impedance matching resistor 356 includes respective switches SW1, SW2, and SW3 and respective resistors R1, R2, and R3, and the resistance values of the resistors R1, R2, and R3 are different from each other. Each resistor R1, R2, and R3 may be selected by the driver controller 350 according to the sensing range of the salinity sensor 390. [

When the square wave generator 354 is enabled, the driver controller 350 generates control signals for turning on any one of the switches SW1, SW2, and SW3 based on the first control signal CTR1 . Each of the switches SW1, SW2, and SW3 may be implemented by a MOS FET, but is not limited thereto.

When the current generator 358 is enabled in accordance with the first control signal CTR1, the current generator 358 supplies the analog current signal as the drive signal DS via the pin 380 to the salinity sensor 390 . For example, the current generator 358 may be a digital-to-analog converter that outputs an analog current signal.

When the voltage generator 358 is enabled in accordance with the first control signal CTR1, the voltage generator 360 supplies the analog voltage signal as the drive signal DS via the pin 380 to the salinity sensor 390 . For example, the voltage generator 358 may be a digital-to-analog converter that outputs an analog voltage signal.

The signal generator 362 may be a signal generator that generates a PWM (Pulse Width Modulation) signal or a signal generator that generates a sawtooth signal.

The analog-to-digital converter circuit 370 includes a voltage-to-digital converter (or first analog-to-digital converter) 372 for converting the DC level corresponding to the sensing signal SS into a digital signal DS1, To-digital converter (or a second analog-to-digital converter) 374 for converting the PWM signal (or the sawtooth signal) corresponding to the digital signal DS2 into the digital signal DS2.

The voltage-to-digital converter collectively refers to an apparatus for converting an input analog voltage (or current) into a digital number representing the magnitude of the voltage (or the current), and includes a time to digital converter (TDC) is a device that recognizes events and provides a digital representation of the time at which they occur, a device that outputs the arrival time of each received pulse, or a digital (or binary) output . ≪ / RTI >

1. Components 354, 356, and 372 enable

Assuming that the salinity sensor 390 receives the square wave as the drive signal DS and exhibits the best sensing function when the first impedance matching resistor comprising the first resistor R1 is selected, On of the first switch SW1 connected to the first resistor R1 among the enable and the impedance matching resistors 356 of the square wave generator 354 among the switches 354, 358, 360 and 362 And outputs the first control signal CTR1 to the driver controller 350. [ At this time, the firmware (F / W) of the MCU 342 uses (or refers to) the data stored in the accessible nonvolatile memory device to generate the control signals CTR1 and CTR2.

The driver controller 350 uses the first control signal CTR1 to enable the square wave generator 354 and turns on the first switch SW1 so that the square wave is passed through the first resistor R1 and the pin 380 And is supplied to the salinity sensor 390. That is, the output signal of the first impedance matching resistor is supplied to the salinity sensor 390 as the drive signal DS.

When the first control signal CTR1 is output to the driver controller 350, the MCU 342 outputs a second control signal CTR2 for enabling the voltage-to-digital converter 372 to the voltage-to-digital converter 372 The voltage-to-digital converter 372 receives the analog sense signal SS received via the pin 380 and converts it into a digital signal DS1. For example, components 354 and 372 may be enabled at the same time.

2. Elements (either 358 or 360 and 372) enable

Assuming that the salinity sensor 390 represents an optimal sensing function when receiving an analog voltage signal (or an analog current signal) as the driving signal DS, the MCU 342 generates the signals 354, 358, 360, and And outputs the generated first control signal CTR1 to the driver controller 350. The first control signal CTR1 controls the enable of the voltage generator 358 or the current generator 360, At this time, the firmware (F / W) of the MCU 342 uses (or refers to) the data stored in the accessible nonvolatile memory device to generate the control signals CTR1 and CTR2.

The driver controller 350 enables the voltage generator 358 or the current generator 360 using the first control signal CTR1.

When the first control signal CTR1 is output to the driver controller 350, the MCU 342 outputs a second control signal CTR2 for enabling the voltage-to-digital converter 372 to the voltage-to-digital converter 372 The voltage-to-digital converter 372 receives the analog sense signal SS received via the pin 380 and converts it into a digital signal DS1. For example, one of the components 358 and 360, 372, may be enabled at the same time.

3. Components 362 and 374 enable

However, assuming that the salinity sensor 390 exhibits the optimal sensing function when receiving the PWM signal or the sawtooth signal with the drive signal DS, the MCU 342 generates the signals from the generators 354, 358, 360, and 362, And generates a first control signal CTR1 for controlling the generation of the PWM signal or the sawtooth wave signal from the generator 362 and outputs the first control signal CTR1 to the driver controller 350. [ At this time, the firmware (F / W) of the MCU 342 uses (or refers to) the data stored in the accessible nonvolatile memory device to generate the control signals CTR1 and CTR2.

The driver controller 350 enables a generator 362 that generates a PWM signal or a sawtooth signal using the first control signal CTR1. For example, components 362 and 374 may be enabled at the same time.

The MCU 342 outputs a second control signal CTR2 for enabling the time-to-digital converter 374 to the time-to-digital converter 372 when the first control signal CTR1 is output to the driver controller 350 The time-to-digital converter 372 receives the analog sense signal SS received via the pin 380 and converts it into a digital signal DS2.

When the analog drive signal DS output from the enabled generator 354, 358, 360, or 362 is supplied to the salinity sensor 390, the waveform and / or level of the sense signal SS is supplied to the salinity sensor 390 Is determined depending on whether or not the sensing electrode and the ground electrode included in the sensing target liquid are electrically connected to each other by the liquid to be sensed.

Since the impedance value of the salinity sensor 390 varies depending on whether the sensing electrode and the ground electrode are electrically connected to each other by the liquid to be sensed, the waveform and / Reflects the impedance value (or the change (amount) of the impedance value), and reflects the concentration (e.g., salinity) of the impurity contained in the sensing object liquid. For example, the waveform and / or the level of the sensing signal SS varies depending on the salinity included in the liquid to be sensed.

358, 360, and 362 according to how the first control signal CTR1 and the second control signal CTR2 are coded (or have certain values) by the firmware F / W, Only one of which is enabled and only one of the analog-to-digital converters 372 and 374 is enabled.

Further, only one of the impedance matching resistors is selected depending on how the first control signal CTR1 is coded (or has certain values) when the square wave generator 354 is enabled by the firmware F / W .

The digital signal DS1 or DS2 output from the enabled analog-to-digital converter 372 or 374 is analyzed by the MCU 342 and a signal corresponding to the result of the analysis (e.g., a signal corresponding to the salinity value) Modulator / demodulator 336 and transmitted to the NFC module 210 of the mobile device 200 as a second RF signal RF2.

FIG. 3 shows a configuration diagram of the non-power NFC salinity detection module shown in FIG. 1, wherein FIG. 4A shows electrodes disposed on the upper surface of the first substrate shown in FIG. 3, And a non-powered NFC salinity sensing IC and antenna electrodes disposed on the bottom surface.

1 to 4B, a credit card-shaped non-power source sensor 300 includes a first substrate 301, a second substrate 302, a first layer 303, a first transparent film 304, A layer 305, and a second transparent film 306. Since the non-power source sensor 300 is manufactured in the form of a credit card, it is portable and convenient to use.

The sensing electrode 391 and the ground electrode 392 of the salinity sensor 390 are formed (or arranged) on the top surface 301T of the first substrate 301 and the bottom surface a non-power NFC salinity sensing IC (or semiconductor package) 330 electrically connected to the sensing electrode 391 and the ground electrode 392 via vias, a non-power NFC salinity sensing IC 330, The first antenna electrode 315 or ANT1 and the second antenna electrode 320 or ANT2 electrically connected to each other are formed (or disposed).

That is, since the first substrate 301 is provided with the conductive electrodes 391 and 392 and the non-power NFC salinity sensing IC 330 that function as a salinity sensor, the first substrate 301 is a sensor module Sensor module).

When a first substrate 301 is cut vertically, a bottom solder mask is formed at the bottom of the first substrate 301 and a bottom layer is formed on or above the bottom solder mask. A core is formed on the bottom layer, a top layer is formed on the core, and a top solder mask is formed on the top layer.

The bottom layer is formed (or implemented) of copper to connect the non-powered NFC salinity sensing IC 330 using surface mount technology (SMT), and the top layer is connected to the sensing electrode 391 and ground (Or implemented) to form (or connect) electrodes 392, the core being formed of FR4, the core formed of FR4 having a thickness of 1.6 mm to 02. mm, the thickness of the copper (+/- 2.5 mu m) to 35 mu m (+/- 5 mu m).

The sensing electrode 391 may also be referred to as a sensor port and is connected to the first pin 380 and the ground electrode 392 is connected to the second pin 385. The non-powered NFC salinity sensing IC 330 may be attached to the bottom surface 301B either in the form of a flip chip or as surface-mount devices.

A first hole 302-1 having a rectangular shape is formed on the second substrate 302. The first layer 303 is disposed directly below the second substrate 302 and includes a first antenna electrode ANT1, An antenna (or antenna pattern) 310 having a structure connected to the second antenna electrode ANT2 and a groove 303-1 are formed.

A second hole 304-1 is formed in the first transparent film 304 and a second layer 305 is formed between the first layer 303 and the second transparent film 306 )do.

Each of the transparent films 304 and 306 performs the function of an overlay and the first layer 303 performs the function of an inlay and the second layer 302 and the second layer 305 respectively May be implemented with polyvinyl chloride (PCV), polyethylene terephthalate (PET), or polyethylene terephthalate glycoll (PETG).

The bottom surface 301B of the first substrate 301 is inserted into the groove 303-1 through the holes 302-1 and 304-1.

FIG. 5 shows the structure of electrodes disposed on the upper surface of the first substrate shown in FIG. 4A and FIG. 5, a sensing electrode 391, a ground electrode 392, and a liquid guide 393 are formed (or arranged) on the upper surface 301T of the first substrate 301 . The sensing electrode 391, the ground electrode 392, and the liquid guide 393 are formed in the same plane.

The ground electrode 392 is electrically separated from the sensing electrode 391 and the ground electrode 392 completely surrounds the sensing electrode 391 and the liquid guide 393 partially surrounds the ground electrode 392, And has a structure for preventing the liquid to be sensed from flowing down.

The sensing electrode 391 may be formed in a circular shape and the ground electrode 392 may be formed in a droplet shape, but the shapes of the electrodes 391 and 392 according to the embodiment of the present invention are not limited thereto. The distance D1 or gap D2 between the ground electrode 392 and the sensing electrode 391 is 1.2 mm ± 0.1 mm and the diameter D1 of the sensing electrode 391 is 1.7 mm ± 0.1 mm. The width D3 of the circular portion is 1.2 mm +/- 0.1 mm.

When the sensing target liquid is diffused to the sensing electrode 391 according to the configurations D1, D2, and D3 of the electrodes 391 and 392, the sensing target liquid is shorted to the electrodes 391 and 392 short).

For example, if the amount of liquid to be sensed is less than 1.0 ml (e.g., a drop of liquid falling from the syringe (the non-power source sensor 300 including the salinity sensor 390 in accordance with embodiments is routinely used) The sensing liquid can sufficiently fill the gap D2 according to the configurations D1, D2, and D3 of the electrodes 391 and 392, The sensing electrode 392 and the sensing electrode 391 may be shorted by the liquid to be sensed.

The ratio S2 / S1 of the area S2 of the ground electrode 392 to the area S1 of the sensing electrode 391 is 10 to 16. According to the ratio (S2 / S1) of the areas S1 and S2, the temperature of the sensing target liquid dropped to the salinity sensor 390 can be equal to the ambient temperature within a short period of time, (Or sensing) the salinity value of the liquid to be sensed in the sensor.

FIG. 6 is a flowchart illustrating an operation method of the salinity measurement system shown in FIG. 1. FIG. Referring to FIGS. 1 to 6, a method of measuring the salinity of a liquid to be sensed is performed using the mobile device 200 and the non-powered sensor 300.

The non-powered sensor 300 transmits the salinity (or salinity value) of the liquid to be sensed to the mobile device 200 in response to the first RF signal RF1 transmitted from the mobile device 200.

When the NFC module 210 transmits the first RF signal RF1 to the non-power source sensor 300 under the control of the mobile app 230 executed in the mobile device 200, the non-power source sensor 300 generates the first RF signal RF1 (S110). The first RF signal RF1 may be used as the power of the non-power source sensor 300. [

The rectifier 334 of the RF interface 332 generates rectified operating voltages for the first RF signal RF1 received via the antenna 310 included in the non-powered sensor 300 (S112).

According to the control of the firmware 344, the MCU 342 generates the first control signal CTR1 and the second control signal CTR2 using the first operating voltage among the operating voltages (S114).

Any one of the different types of drive signal generators 354, 358, 360, and 362 is enabled in accordance with the second operating voltage and the first control signal CTR1 among the operating voltages, - digital converters 372 and 374 are enabled in accordance with the third operating voltage and the second control signal CTR2 among the operating voltages (S116). For example, the voltage level and the supply timing of each of the operating voltages may be controlled by the power management unit 340.

The analog drive signal DS generated by the drive signal generator 354, 358, 360 or 362 enabled based on the first control signal CTR1 is transmitted to the non-powered sensor 300 via the bidirectional signal transmission pin 380. [ To the salinity sensor 390 included in the salinity sensor 390 (S118).

When the analog drive signal DS is transmitted to the salinity sensor 390, the analog-to-digital converter 372 or 374 enabled based on the second control signal CTR2 receives via the bidirectional signal transmission pin 380 The analog sense signal SS is converted into a digital signal DS1 or DS2 (S120 and S122).

The MCU 342 transmits the salinity (or saltiness value) generated based on the digital signal DS1 or DS2 to the NFC module 210 as the second RF signal RF2 through the RF interface 332 and the antenna 310 , And the NFC module 210 transmits a signal corresponding to the second RF signal RF2 to the mobile app 230 (S124).

The mobile app 230 analyzes the signal transmitted from the NFC module 210 and displays the analysis result on the display device of the mobile device 200 (S126).

The different types of drive signal generators are the square wave generator 354, the current generator 358, the voltage generator 360 and the signal generator 362, and the different types of analog-to-digital converters are voltage- Digital converter 374 and the enabled drive signal generator when the enabled analog-to-digital converter is a voltage-to-digital converter 372 includes a square wave generator 354, a current generator 358, and a voltage generator 360).

When the enabled analog-to-digital converter is a time-to-digital converter 372, the enabled drive signal generator is a signal generator 362 and the signal generator 362 is a PWM signal generator or sawtooth generator.

A first control signal CTR1 enabling only one of the square-wave generator 354, the current generator 358, the voltage generator 360 and the signal generator 362 and the voltage-to-digital converter 372 and the time- Digital converter 374 is determined according to the nature or kind of the salinity sensor 390. The second control signal CTR2,

7 is a conceptual diagram illustrating a method of operating a mobile app according to an embodiment of the present invention. A method of operation of the mobile application (MAPP or 230) is described with reference to Figs.

Each configuration 232, 234, 236, 238, 242, 244, and 246 may be implemented as a graphical user interface (GUI).

First, the mobile application 230 can provide the user with a GUI 233 for selecting the NFC antenna position for each mobile device through the display device of the mobile device 200. Since the position of the NFC antenna for each mobile device may be different according to the model of the manufacturer of the mobile device 200, the user can select an NFC antenna suitable for the mobile device 200.

The mobile app 230 may provide the user with a GUI 234 for measuring salinity by food through the display device of the mobile device 200. The user touches the GUI 236 to select any one of 'Korean food', 'Japanese food', and 'Chinese food' and selects a food (eg, A food, B food, or C food) (E.g., 0.9%, 1.1%., Or 1.0%) is displayed in the reference salinity GUI 238. [

For example, if the user selects 'Korean food', a list of foods is displayed on the display device, and when the user selects 'A food', the reference salinity of the selected 'A food' Is displayed on the GUI 238. [

The mobile app 230 analyzes the signal transmitted from the NFC module 210 (for example, a signal corresponding to the salinity (or salinity value) sensed by the salinity sensor 390, corresponding to the second RF signal RF2) , The analysis result may be displayed on the graphical GUI 242 and the salinity (or salinity value) may be displayed numerically on the GUI 244. [ The mobile app 230 may also compare the salinity (or salinity value) with the baseline salinity and display the results of the comparison in textual representation in the GUI 246.

For example, when the salinity corresponding to the analysis result is lower than the reference salinity of the selected food, the mobile app 230 displays the salinity of the liquid to be detected as low salinity 246, and when the salinity is higher than the reference salinity, ) Indicates the salinity of the liquid to be detected by the high salinity 246, and when the salinity is within the error range of the reference salinity, the mobile app 230 displays the salinity of the liquid to be sensed (usually, 246) do.

Accordingly, the user can not only confirm the salinity of the selected food (or liquid to be sensed) through the GUI 242 and / or 244, but also determine the salinity of the selected food (or liquid to be sensed) It has the effect of confirming how high or low.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: Salinity measurement system
200: mobile device
210: NFC module
220: Processor
230: Mobile app
300: Non-power NFC Salinity Sensing Module or Non-Power Sensor
301: first substrate
302: second substrate
303: Layer 1
304: first transparent film
305: Second layer
306: second transparent film
310: antenna
330: Non-powered NFC Salinity Sensing IC
332: RF interface
342: microcontrol unit (MCU)
350: Driver Controller
352: Sensor driver circuit
370: Analog-to-digital circuit
372: Voltage-to-digital converters
374: Time-to-digital converter
380: pin, bidirectional signal transmission pin
390: Salinity sensor

Claims (7)

A first substrate having an upper surface on which a sensing electrode and a ground electrode are arranged, a bottom surface on which an IC chip connected to the sensing electrode and the ground electrode, and a first antenna electrode connected to the IC chip and a second antenna electrode are disposed;
A second substrate including a first hole;
An antenna disposed below the second substrate and having a structure connected to the first antenna electrode and the second antenna electrode; And
And a transparent film including a second hole and disposed on the second substrate,
The bottom surface of the first substrate is inserted into the groove through the first hole and the second hole,
The IC chip includes:
A sensor driver circuit for transmitting an analog driving signal to the sensing electrode through a pin of the IC chip;
When an impedance between the sensing electrode and the ground electrode changes as the sensing target liquid contacts the sensing electrode and the ground electrode, the analog sensing signal generated in accordance with the impedance change is received through the pin, An analog-to-digital converter circuit for converting; And
A driver controller,
Wherein the sensor driver circuit comprises:
A square wave generator for generating a square wave;
Impedance matching resistors formed between the output terminal of the square wave generator and the pin;
A current generator coupled to the pin;
A voltage generator coupled to the pin; And
And a signal generator coupled to the pin,
Wherein the driver controller enables only one of the square wave generator, the current generator, the voltage generator, and the signal generator to generate the analog driving signal,
When the square wave generator is enabled and one of the impedance matching resistors is selected by the driver controller, the square wave corresponding to the analog driving signal generated from the square wave generator is coupled to the pin through a selected impedance matching resistor And,
Wherein the ground electrode is electrically separated from the sensing electrode, and the ground electrode completely surrounds the sensing electrode. The method according to claim 1,
The diameter of the sensing electrode is 1.7 mm +/- 0.1 mm,
Wherein the gap between the ground electrode and the sensing electrode is 1.2 mm +/- 0.1 mm and the width of the circular portion of the ground electrode is 1.2 mm +/- 0.1 mm. The method according to claim 1,
Wherein the ratio of the area of the ground electrode to the area of the sensing electrode is 10 to 16. delete The method according to claim 1,
The analog-to-digital converter circuit comprises:
Voltage-to-digital converter; And
Time-to-digital converter,
When the square wave generator, the current generator, and the voltage generator are enabled, the voltage-to-digital converter is enabled,
When the signal generator is enabled, the time-to-digital converter is enabled,
Wherein the signal generator is a PWM signal generator or a sawtooth wave generator. The method according to claim 1,
And a liquid guide disposed on the upper surface to prevent the detection target liquid from flowing down,
The liquid guide partially surrounds the ground electrode. The method according to claim 6,
The diameter of the sensing electrode is 1.7 mm +/- 0.1 mm,
The clearance between the ground electrode and the sensing electrode is 1.2 mm +/- 0.1 mm,
The width of the circular portion of the ground electrode is 1.2 mm +/- 0.1 mm,
Wherein the ratio of the area of the ground electrode to the area of the sensing electrode is 10 to 16.

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