WO2018171723A1

WO2018171723A1 - Near field communication front-end hardware circuit, terminal, reader/writer, system and method

Info

Publication number: WO2018171723A1
Application number: PCT/CN2018/080227
Authority: WO
Inventors: 陈柳章
Original assignee: 深圳市文鼎创数据科技有限公司
Priority date: 2017-03-24
Filing date: 2018-03-23
Publication date: 2018-09-27

Abstract

The present application is applicable to the technical field of communications. Provided are a near field communication front-end hardware circuit, terminal, reader/writer, system and method. The near field communication front-end hardware circuit comprises: a near field communication antenna, a wave detection unit and a communication interface pin unit; the near field communication antenna comprises a near field coil and a matching circuit, the frequency of the near field coil matches a selected carrier frequency; the wave detection unit is used for filtering out a carrier in a received modulation signal to obtain the original modulation signal, and the wave detection unit is connected to the near field coil; the communication interface pin unit is used for outputting the original modulation signal to a micro-control unit, and the communication interface pin unit is connected between the wave detection unit and the micro-control unit. The above-mentioned circuit enables power consumption to be significantly reduced.

Description

Near field communication front end hardware circuit, terminal, reader/writer, system and method

Technical field

This application belongs to the field of communication technology

Background technique

Near field communication technology is evolved from the integration of non-contact radio frequency identification (RFID) and interoperability technologies. It combines inductive readers, inductive cards and point-to-point functions on a single chip. Identification and data exchange with compatible devices. This technology is currently widely used, such as bank dual interface cards, new visual bank cards, dynamic tokens (One-time) Password, OTP) card, etc.

At present, most of the solutions use Near Field Communication (NFC) chips for communication, and the cost is high. The control chip and the external reader A have complex interactions and high power consumption.

technical problem

The embodiment of the invention provides a near-field communication front-end hardware circuit, a terminal, a reader/writer, a system and a method, so as to solve the problem of high cost, complicated interaction and high power consumption when using NFC chip communication in the prior art. problem.

Technical solution

A first aspect of the embodiments of the present invention provides a near field communication front end hardware circuit, where the near field communication front end hardware circuit includes:

Near field communication antenna, detection unit and communication interface pin unit;

The near field communication antenna includes a near field coil and a matching capacitor, and a frequency of the near field coil matches a selected carrier frequency;

The detecting unit is configured to filter a carrier in the received modulated signal to obtain an original modulated signal, and the detecting unit is connected to the near field coil;

The communication interface pin unit is configured to output the original modulation signal to a micro control unit, and the communication interface pin unit is connected between the detection unit and the micro control unit.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the detecting unit is configured to filter the received seed or the carrier in the production configuration data to obtain an original modulated signal, and correspondingly, the communication interface is a foot unit for outputting the original modulated signal to a micro control unit, the communication interface pin unit being connected between an output end of the detecting unit and an input/output pin of the micro control unit.

With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the near field communication front end hardware circuit further includes:

a back-end matching unit, configured to perform a decision matching on the original modulated signal, and output the matched signal to the micro-control unit through the communication interface pin unit, where the back-end matching unit is connected to the detection Between the unit and the communication interface pin unit.

In conjunction with the second possible implementation of the first aspect, in a third possible implementation of the first aspect, the backend matching unit includes:

The backend matching unit is a comparison discriminating unit or an AD sampling unit.

In conjunction with the third possible implementation of the first aspect, in a fourth possible implementation manner of the first aspect, the comparison determining unit includes:

Comparator and resistor R2, resistor R3;

a forward input end of the comparator is connected to an output end of the filter unit, an inverting input end of the comparator is grounded through the resistor R2, and an inverting input end of the comparator further passes through the resistor R3 Connected to an input/output interface of the micro control unit, and an output end of the comparator is connected to a receiving signal end of the micro control unit;

The AD sampling unit is an analog to digital converter.

In conjunction with the first aspect, or in combination with the second possible implementation of the first aspect, or in combination with the third possible implementation of the first aspect, in a fifth possible implementation of the first aspect, the near field communication The front end hardware circuit further includes a load modulation unit;

The load modulation unit is configured to perform load modulation and transmit a modulation signal by controlling a load change of the near field coil, and the load modulation unit is connected to the detection unit.

In conjunction with the fifth possible implementation of the first aspect, in a sixth possible implementation manner of the first aspect, the load modulation unit includes:

a switch circuit module and a load control module;

a first end of the load control module is connected to the detecting unit, a second end of the load control module is connected to a current input end of the switch circuit module, and a current output end of the switch circuit module is grounded, The first control end and the second control end of the switch circuit module are respectively connected to the input/output interface and the transmit signal end of the micro control unit through the communication interface pin unit.

With reference to the first possible implementation manner of the first aspect, in a seventh possible implementation manner of the first aspect, the detecting unit includes a unidirectional conduction unit and a filtering unit;

The one-way conduction unit is a diode, a triode or a MOS tube;

The filtering unit includes:

Resistor R2 and capacitor C2;

One end of the resistor R2 is connected to an input end of the filtering unit and an output end of the unidirectional conduction unit, and an input end of the unidirectional conduction unit is connected to the near field coil, and one end of the resistor R2 is simultaneously An output end of the filtering unit is connected to one end of the capacitor C2, and one end of the capacitor C2 is connected to an output end of the filtering unit and the communication interface pin unit, and the other end of the resistor R2 is The other end of the capacitor C2 is grounded at the same time;

Or, the filtering unit includes:

Resistor R5, capacitor C4 and inductor L1;

One end of the capacitor C4 is connected to the input end of the filtering unit, and the other end of the capacitor C4 is connected to the input end of the single-conducting unit. The output end of the unidirectional conduction unit is connected to the communication interface pin unit, and the other end of the capacitor C4 is also grounded through the resistor R5, and the inductor L1 is connected in parallel with the capacitor C4.

With reference to the seventh possible implementation of the first aspect, in an eighth possible implementation manner of the first aspect, the near field communication front end hardware circuit further includes a load modulation unit;

The load modulation unit is configured to perform load modulation by controlling a load change of the near field coil and transmit a modulation signal that completes a seeding or production configuration, and the load modulation unit is connected to the detection unit.

In conjunction with the eighth possible implementation of the first aspect, in a ninth possible implementation manner of the first aspect, the load modulation unit includes:

a switch circuit module and a load control module;

a first end of the load control module is connected to an output end of the single-conducting unit, a second end of the load control module is connected to a current input end of the switch circuit module, and a current output of the switch circuit module The first control end and the second control end of the switch circuit module are respectively connected to the input/output interface and the transmit signal end of the micro control unit through a communication interface pin unit.

A second aspect of the embodiments of the present invention provides a near field communication terminal, where the front end hardware circuit of the near field communication terminal includes the first aspect or the second possible implementation manner of the first aspect, or the first aspect Three possible implementations, or a fifth possible implementation of the first aspect, or a near field communication front end hardware circuit as described in the sixth possible implementation of the first aspect.

A third aspect of the embodiments of the present invention provides a reader/writer, the front end hardware circuit of the reader/writer includes the first aspect or the second possible implementation manner of the first aspect, or the third aspect of the first aspect A near field communication front end hardware circuit as described in the possible implementation.

According to a fourth aspect of the present invention, a near field wireless communication system is provided, the near field wireless communication system comprising the near field communication terminal of the second aspect and the reader/writer of the third aspect.

A fifth aspect of the embodiments of the present invention provides a dynamic token, where the dynamic token includes a first possible implementation manner of the first aspect, or a second possible implementation manner of the first aspect, or the first aspect The fourth possible implementation manner, or the seventh possible implementation manner of the first aspect, or the eighth possible implementation manner of the first aspect, or the near field communication front end described in the ninth possible implementation manner of the first aspect Hardware circuit.

A sixth aspect of the embodiments of the present invention provides a card reader, where the front end hardware circuit of the card reader includes a first possible implementation manner of the first aspect, or a second possible implementation manner of the first aspect, Or the near field communication front end hardware circuit of the fourth possible implementation manner of the first aspect or the seventh possible implementation manner of the first aspect.

A seventh aspect of the embodiments of the present invention provides an OTP near field communication system, the system comprising the dynamic token of the fifth aspect and the card reader of the sixth aspect.

An eighth aspect of the embodiments of the present invention provides a method for seeding or producing a dynamic token, the method being based on the dynamic token according to the fifth aspect, the method comprising:

Receiving seed or production configuration data sent by the reader/writer;

Filtering off the seed signal in the seed or production configuration data by the detecting unit to obtain an original modulated signal;

Outputting the original modulated signal to the micro control unit through the communication interface pin unit;

Tell the reader that the seeding or production configuration is complete.

With reference to the eighth aspect, in a first possible implementation manner of the eighth aspect, the step of outputting the original modulated signal to a micro control unit by using a communication interface pin unit is specifically:

Outputting the original modulated signal to a backend matching unit for decision matching;

The matched signal is output to the micro control unit through the communication interface pin unit.

With reference to the first possible implementation manner of the eighth aspect, in a second possible implementation manner of the eighth aspect, the original modulation signal is subjected to decision conversion according to the amplitude threshold to implement a decision matching; or

The decision matching is performed by performing AD sampling on the original modulated signal and generating a sample value according to the voltage amplitude value read out by the sampling.

In conjunction with the first possible implementation of the eighth aspect, in a third possible implementation manner of the eighth aspect, the step of notifying the reader to complete the seeding or production configuration is specifically:

After the micro control unit responds to the original modulated signal to generate a response signal, the load modulation unit is controlled according to the response signal, and the load modulation unit controls the load change of the near field coil to perform load modulation;

The modulated response signal is sent to the reader/writer.

A ninth aspect of the embodiments of the present invention provides a method for a card reader to seed or write a production configuration to a dynamic token, the method being based on the card reader of the sixth aspect, the method comprising:

The seed or production configuration data is modulated by a carrier to generate transmission information, where the transmission information includes: a standard interface signal or a customized low-speed modulation or amplitude modulation modulation signal;

Transmitting the sending information to the dynamic token through the communication interface pin unit, so that the dynamic token completes seeding or production configuration;

Receiving and demodulating the notification signal of the completed seeding or production configuration of the dynamic token transmission.

A tenth aspect of the embodiments of the present invention provides a near field wireless communication method based on a near field communication front end hardware circuit, including:

Receiving a modulated signal transmitted by a reader/writer through a near field communication antenna, the near field communication antenna including a near field coil and a matching capacitor;

Filtering the carrier of the modulated signal by the detecting unit to obtain an original modulated signal;

The original modulated signal is output to the micro control unit through the communication interface pin unit.

In conjunction with the tenth aspect, in a first possible implementation of the tenth aspect, the outputting the original modulated signal to the MCU circuit by using a first communication interface pin includes:

Outputting the original modulated signal to a backend matching unit for matching;

And matching the signal matched by the backend matching unit to the micro control unit through the communication interface pin unit.

With the tenth aspect, in a second possible implementation manner of the tenth aspect, after the outputting the original modulated signal to the micro control unit by using the communication interface pin unit, the method includes:

The modulated response signal is sent to the reader/writer.

In conjunction with the tenth aspect, in a third possible implementation of the tenth aspect, the load modulation unit includes a switch circuit module, and when the modulated signal sent by the reader/writer is received by the near field communication antenna, the method includes:

The switch circuit module is controlled to be in an off state such that less current is passed through the near field communication antenna.

With reference to the first possible implementation manner of the tenth aspect, in a fourth possible implementation manner of the tenth aspect, the back end matching unit is a comparison determining unit, and the outputting the original modulated signal to the End matching unit matching, including:

Outputting the original modulated signal to the comparison determining unit, if the amplitude of the original modulated signal exceeds a preset amplitude threshold, the comparison determining unit outputs a high level; otherwise, outputs a low level;

or,

The back-end matching unit is an AD sampling unit. In this case, the outputting the original modulated signal to the back-end matching unit, including:

Outputting the original modulated signal to an AD sampling unit, where the AD sampling unit determines a voltage amplitude value of the original modulated signal, and if the voltage amplitude value exceeds a preset voltage amplitude threshold, outputs 1; otherwise, outputs 0. .

According to an eleventh aspect of the embodiments of the present invention, a near field wireless communication method based on a near field communication front end hardware circuit is provided, including:

Modulating the carrier according to the transmitted information to obtain a modulated signal;

The modulated signal is transmitted to the near field communication terminal through the communication interface pin unit to cause the near field communication terminal to receive the modulated signal through the near field communication antenna.

In conjunction with the eleventh aspect, in a first possible implementation of the eleventh aspect, the modulating signal is transmitted to the near field communication terminal through the communication interface pin unit to enable the near field communication terminal to pass through After receiving the modulated signal, the field communication antenna includes:

Receiving, by the near field communication antenna, the modulated response signal sent by the near field communication terminal, where the response signal is generated by the micro control unit of the near field communication terminal responding to the received original modulated signal;

Filtering, by the detecting unit, a carrier of the modulated response sent by the near field communication terminal;

The signal after filtering the carrier is output to the micro control unit through the communication interface pin unit.

Beneficial effect

Since the carrier in the received modulated signal can be filtered out, the original modulated signal is obtained, and the original modulated signal is sent to the micro control unit, thereby reducing the cost by using the existing NFC chip to achieve near field communication. Since the corresponding functions can be realized only by the near field communication antenna, the detecting unit and the communication interface pin unit, the communication interaction with the reader/writer is simple, thereby effectively reducing power consumption.

DRAWINGS

1 is a circuit diagram showing an example circuit of a first type of near field communication front end hardware circuit according to Embodiment 1 of the present invention;

2 is an example circuit of a backend matching unit in a near field communication front end hardware circuit according to Embodiment 1 of the present invention;

3 is a schematic circuit diagram of a second near field communication front end hardware circuit according to Embodiment 1 of the present invention;

4 is a schematic circuit diagram of a third near field communication front end hardware circuit according to Embodiment 1 of the present invention;

5 is a flowchart of a first field wireless communication method based on a near field communication front end hardware circuit according to Embodiment 1 of the present invention;

6 is a flowchart of a second field wireless communication method based on a near field communication front end hardware circuit according to Embodiment 1 of the present invention;

7 is a circuit diagram showing an example circuit of a fourth near field communication front end hardware circuit according to Embodiment 2 of the present invention;

FIG. 8 is a flow chart showing a method for seeding or production configuration of a dynamic token according to Embodiment 2 of the present invention.

Embodiments of the invention

Example 1

1 shows an example circuit of a first type of near field communication front end hardware circuit provided by an embodiment of the present invention. In FIG. 1, the near field communication front end hardware circuit includes:

Near field communication antenna, detection unit 100 and communication interface pin unit 13;

The near field communication antenna includes a near field coil 2 and a matching capacitor C1, the frequency of the near field coil 2 matching the selected carrier frequency;

The detecting unit 100 includes a unidirectional conduction unit 11 and a filtering unit 12 for filtering a carrier in the received modulated signal to obtain an original modulated signal, and the detecting unit 100 is connected to the near field coil 2;

It should be noted that the detecting unit 100 may also include only the filtering unit 12. When the filtering unit 12 requires a unidirectional signal, the unidirectionally-passing unit 11 may be disposed in the detecting unit 100, so that the signal is output through the unidirectional conduction unit 11 first. The signal is supplied to the filtering unit 12.

Of course, it is also possible to use the filtering unit 12 which itself has the unidirectional conduction function. In this case, the unidirectional conduction unit 11 may not be included in the detection unit 100.

Alternatively, the implementation of the filtering unit 12 does not need to define a polarity. In this case, the unidirectional conduction unit 11 may not be provided in the detecting unit 100.

When the unidirectional conduction unit 11 is not provided, if the filtered waveform of the filtering unit 12 has positive and negative portions, the positive or negative polarity can be processed through the interface of the back end matching unit or the MCU or the reception can be matched by differential input.

The communication interface pin unit 13 is configured to output the original modulation signal to the micro control unit MCU, and the communication interface pin unit 13 is connected between the detection unit 100 and the MCU.

In the embodiment of the present invention, the near field communication antenna receives the modulated signal sent by the reader/writer, filters out the carrier of the modulated signal, obtains the original modulated signal, and sends the obtained original modulated signal to the MCU. Since the carrier in the received modulated signal can be filtered out, the original modulated signal is obtained, and the original modulated signal is sent to the micro control unit, thereby reducing the cost by using the existing NFC chip to achieve near field communication. Since the corresponding functions can be realized only by the near field communication antenna, the detecting unit and the communication interface pin unit, the communication interaction with the reader/writer is simple, thereby effectively reducing power consumption.

FIG. 2 shows an example circuit of a back-end matching unit in the near-field communication front-end hardware circuit provided by the embodiment of the present invention. For convenience of description, only parts related to the present invention are shown.

Optionally, the near field communication front end hardware circuit further includes:

a back-end matching unit 14 configured to perform a decision matching on the original modulated signal, and output the matched signal to the micro-control unit through the communication interface pin unit 13, the back-end matching unit 14 is connected to The detecting unit 100 is connected to the communication interface pin unit 13.

Optionally, the backend matching unit 14 is a comparison determining unit or an AD sampling unit;

The comparison discriminating unit includes:

Comparator U1 and resistor R2, resistor R3;

The forward input of the comparator U1 is connected to the output of the filter unit 12, the inverting input of the comparator U1 is grounded through the resistor R2, and the reverse input of the comparator U1 is also passed. The resistor R3 is connected to an input and output interface of the micro control unit, and an output end of the comparator U1 is connected to a receiving signal end of the micro control unit;

It is worth noting that the connection between the forward input and the reverse input of the comparator can be reversed. The phase of the input signal is reversed during the exchange, or a differential input can be used.

In the embodiment of the present invention, by comparing the discriminating unit to discriminate the valid data, the amplitude threshold may be set by the resistor R2 and the resistor R3, and the comparator U1 compares the current input value with the amplitude threshold. If the input value is greater than the amplitude threshold, the comparator U1 outputs a high level signal. If the input value is less than the amplitude threshold, the comparator U1 outputs a low level signal, and sends the output high and low level signals to the processing chip for back end processing.

Of course, an analog-to-digital converter can also be used as the AD sampling unit connected between the detecting unit 100 and the communication interface pin unit 13.

In the embodiment of the present invention, the voltage amplitude value is read out by the AD sampling, and when the voltage amplitude value reaches or exceeds the threshold value, the sampling unit outputs a high level, and when the voltage amplitude value is lower than the limit threshold, the sampling unit outputs a low level, AD When sampling, the modulation method is not limited to OOK, the waveform of the original modulation information is extracted, and other modulation methods such as ASK can also be used.

FIG. 3 is a circuit diagram showing a second near field communication front end hardware circuit according to an embodiment of the present invention. The near field communication front end hardware circuit further includes a load modulation unit 15.

The load modulation unit 15 is configured to perform load modulation and transmit a modulation signal by controlling a load change of the near field coil, and the load modulation unit 15 is connected to the detection unit 100.

FIG. 4 is a circuit diagram showing a third type of near field communication front end hardware circuit provided by an embodiment of the present invention. In FIG. 4, the load modulation unit 15 includes:

Switch circuit module 151 and load control module 152;

The first end of the load control module 152 is connected to the detecting unit 100, the second end of the load control module 152 is connected to the current input end of the switch circuit module 151, and the current output of the switch circuit module 151 The first control terminal GPIO and the second control terminal TX of the switch circuit module 151 are respectively connected to the input/output interface GPIO and the transmit signal terminal TX of the micro control unit through the communication interface pin unit 13.

Preferably, the switch circuit module 151 includes:

a second switch tube Q2 and a third switch tube Q3;

The current input end of the second switch tube Q2 is the current input end of the switch circuit module 151, the current output end of the second switch tube Q2 is the current output end of the switch circuit module 151, and the control end and the third switch of the second switch tube Q2. The current output end of the tube Q3 is connected, the current input end of the third switch tube Q3 is the first control end of the switch circuit module 151, and the control end of the third switch tube Q3 is the second control end of the switch circuit module 151.

In the embodiment of the present invention, the second switching transistor Q2 and the third switching transistor Q3 constitute a switching circuit, and the switching of the MOS tube can change the load of the coil, and the coil load change is coupled to the transmitting coil of the reader/writer end, and the reader/writer Modulation information can be demodulated by the transmitted coil load change.

In order to prevent false triggering, by TX and bus expander (General Purpose Input Output, GPIO) Controls the load switch at the same time.

Of course, the switch circuit module 151 can also be realized by a switch tube, or by using a switch tube and a resistor connected in series at the control end of the switch tube.

In the embodiment of the present invention, the switch circuit module 151 functions as a load modulation, and may have only two switch states, or a range of load modulation.

The load control module 152 includes:

Resistor R4;

Both ends of the resistor R4 are the first end and the second end of the load control module 152, respectively.

Optionally, the resistor R4 can also be connected in parallel with a capacitor to form the load control module 152.

The communication interface pin unit 13 is composed of RX and TX pins, and the RX/TX can be directly connected to a chip such as a micro control unit MCU, or connected to a chip such as a micro control unit MCU through a back end matching unit.

The embodiment of the present invention further provides a near field communication terminal, and the front end hardware circuit of the near field communication terminal includes the near field communication front end hardware circuit of FIG. 1 to FIG.

The embodiment of the present invention further provides a reader/writer, and the front end hardware circuit of the reader/writer includes the near field communication front end hardware circuit of FIG. 1, FIG. 3 and FIG.

Embodiments of the present invention also provide a near field wireless communication system including the near field communication terminal and the reader/writer described above.

FIG. 5 is a flowchart of a first field wireless communication method based on a near field communication front end hardware circuit according to an embodiment of the present invention. FIG. 5 mainly describes the near field communication terminal from the side of the near field communication terminal ( The reader interacts with the near field communication terminal and the data interaction method of the reader with the passive near field communication mode, including:

Step S51: Receive a modulated signal sent by the reader/writer through a near field communication antenna, where the near field communication antenna includes a near field coil and a matching capacitor.

The modulated signal may be an existing standard interface signal, such as UART, IIC, SPI, single-wire transmission protocol, etc., or may be a customized low-speed modulation, amplitude modulation, etc., and the waveform of the signal may be a rectangular wave. , sine wave, triangle wave or custom waveform.

Step S52, filtering the carrier of the modulated signal by the detecting unit to obtain an original modulated signal.

Specifically, the carrier of the modulated signal is filtered by the customized detection unit, and the interaction mode is simple.

Step S53, outputting the original modulated signal to the micro control unit through the communication interface pin unit.

Optionally, in order to output the target signal, the step S53 includes:

A1. Output the original modulated signal to the backend matching unit for matching. The backend matching unit is a comparison discriminating unit or an AD sampling unit.

A2. The signal matched by the backend matching unit is output to the micro control unit through the communication interface pin unit.

Since the signal output to the MCU circuit is matched by the matching circuit, it is possible to output a target signal that meets the requirements.

Optionally, the near field communication terminal needs to respond to the received original modulated signal, and the response signal is sent back to the reader/writer. After the step S53, the method includes:

B1, after the micro control unit responds to the original modulated signal, generates a response signal, controls a load modulation unit according to the response signal, and controls load variation of the near field coil by the load modulation unit to perform load modulation. .

B2. Send the modulated response signal to the reader/writer.

Specifically, the near field coil equivalent load is modulated by ASK (Amplitude Shift Keying Modulation) or OOK (On Key Control) based on the transmitted response signal. The antenna (or coil) of the near field communication terminal (such as a radio frequency card) is the load of the reader antenna (or coil), and the radio frequency card is read and written by changing the parameters of the near field communication antenna loop (such as resonance and detuning). The terminal is modulated to achieve data transmission from the RF card to the reader with weak energy, which reduces power consumption.

Optionally, the load modulation unit includes a switch circuit module, in order to reduce the influence of the near field communication terminal on other communication coils when receiving the state, when the modulated signal sent by the reader/writer is received by the near field communication antenna, :

When the near field communication terminal is in the receiving state, the switching circuit or the switching device is in an off state. At this time, the near field communication antenna of the near field communication terminal has a large equivalent impedance, and the passing current is small, and the low power consumption state is maintained. The RF energy is hardly consumed, and even when there are a plurality of near-field coils on the same circuit board, the near-field communication terminal consumes almost no RF energy, thereby avoiding the influence on other communication coils.

Optionally, the back-end matching unit is a comparison determining unit, and at this time, the outputting the original modulated signal to the back-end matching unit, including:

And outputting the original modulated signal to the comparison determining unit, if the amplitude of the original modulated signal exceeds a preset amplitude threshold, the comparison determining unit outputs a high level; otherwise, outputs a low level.

or,

In the embodiment of the present invention, since the communication between the near field communication terminal and the reader/writer is realized by modulating the equivalent load of the near field coil, for example, the antenna (or coil) of the near field communication terminal is the reader antenna (or The load of the coil), the near field communication terminal modulates the reader/writer end by changing parameters of the near field communication antenna loop (such as resonance and detuning), thereby realizing weak energy from the near field communication terminal to the reader/writer. Data transfer, simple operation, and reduced power consumption. Moreover, the purpose of near field communication can be achieved without using an existing NFC chip, thereby reducing costs.

FIG. 6 is a flowchart of a second-field wireless communication method based on a near-field communication front-end hardware circuit according to an embodiment of the present invention. FIG. 6 mainly describes the reader from the reader side (the read) The data interaction method between the writer and the near field communication terminal and the near field communication terminal in the passive near field communication mode includes:

Step S61, modulating the carrier according to the transmitted information to obtain a modulated signal.

When the reader writes information to the near field communication terminal: the reader provides a carrier signal. The reader/writer modulates the carrier signal by ASK (Amplitude Shift Keying Modulation) or OOK (Open Key Control) based on the transmitted information. Of course, the reader can also adjust the carrier frequency by offsetting the coil. The frequency, indirectly, achieves the equivalent effect of amplitude modulation. The transmitted information may be an existing standard interface signal, such as UART, IIC, SPI, single-line transmission protocol, etc., or may be a customized low-speed modulation, amplitude modulation, etc., and the waveform of the signal may be a rectangular wave. , sine wave, triangle wave or custom waveform.

Step S62, transmitting the modulation signal to the near field communication terminal through the communication interface pin unit, so that the near field communication terminal receives the modulation signal through the near field communication antenna.

Optionally, when the reader reads the information from the near field communication terminal, that is, after the step S62, the method includes:

And receiving, by the near field communication antenna, the modulated response signal sent by the near field communication terminal, where the response signal is generated by the micro control unit of the near field communication terminal responding to the received original modulated signal.

C2: Filtering, by the detecting unit, a carrier of the modulated response sent by the near field communication terminal.

C3. The signal after filtering the carrier is output to the micro control unit through the communication interface pin unit.

In the embodiment of the present invention, since the communication between the reader/writer and the near field communication terminal is realized by modulating the equivalent load of the near field coil, data transmission from the near field communication terminal to the reader/writer is realized with weak energy, Simple operation, which reduces power consumption. Moreover, the purpose of near field communication can be achieved without using an existing NFC chip, thereby reducing costs.

Example 2

In addition to the case of Embodiment 1, the near field communication front end hardware circuit may further include the following devices, with specific reference to FIG. 1, FIG. 2, and FIG. 3:

The near field communication antenna includes a near field coil 2 and a matching capacitor C1, and the frequency of the near field coil 2 matches the selected carrier frequency;

The detecting unit 100 includes a unidirectional conduction unit 11 and a filtering unit 12 for filtering the received seed or the carrier in the production configuration data to obtain an original modulated signal, and the detecting unit 100 is connected to the near field coil 2;

The communication interface pin unit 13 is configured to output the original modulation signal to the micro control unit MCU, and the communication interface pin unit 13 is connected between the detection unit and the micro control unit MCU.

In the embodiment of the present invention, the near field communication antenna receives the seed or production configuration data sent by the reader/writer, filters the seed or production configuration data through the detection unit 100 to filter the carrier signal of the modulated signal, obtains the original modulated signal, and modulates the original modulation. The signal is output to the micro control unit MCU through the communication interface pin unit 13 and informs the reader that the seeding or production configuration is completed.

The embodiment of the invention realizes the seed or production configuration by using the near field communication front end hardware circuit built on the discrete device, and the solution does not need to set the contact in the OTP card, does not need the secondary packaging, and can be realized only by wireless communication (existing In the production of OTP cards, contact contacts are generally used to transmit data. In the production configuration and when the OTP is seeded at the client, the contacts need to be reserved in the structure, resulting in the product not being fully packaged. After the secondary encapsulation), the problem of complicated process steps, long product cycle and high cost caused by the secondary packaging of the existing OTP card is avoided.

As an embodiment of the present invention, the detecting unit 100 in FIG. 4 includes a unidirectional conduction unit 11 and a filtering unit 12;

The single-conducting unit 11 can be implemented by a diode, a triode or a MOS tube. Preferably, the diode D1 is used. The anode of the diode D1 is connected to the near-field coil 2 at the input end of the unidirectional conduction unit 11, and the cathode of the diode D1 is a unidirectional conduction unit. The output of 11 is connected to the filtering unit 12.

The filtering unit 12 includes:

Resistor R2 and capacitor C2;

One end of the resistor R2 is connected to the output end of the filter unit 12 and the output end of the one-way conduction unit 11. One end of the resistor R2 is simultaneously connected to the output end of the filter unit 12 and one end of the capacitor C2, and one end of the capacitor C2 is the filter unit 12 The output terminal is connected to the communication interface pin unit 13, and the other end of the resistor R2 is grounded at the same time as the other end of the capacitor C2.

The filtering unit 12 can also be replaced by other equivalent devices or circuits, and the filtering unit 12 can also be connected in reverse connection with the unidirectional conduction unit 11, that is, the input end of the filtering unit 12 is connected to the near field coil 2, and the filtering unit 12 is The output end is connected to the input end of the one-way communication unit 11, and the output end of the one-way communication unit 11 is connected to the communication interface pin unit 13. As shown in FIG. 7, the filtering unit 12 may further include:

Resistor R5, capacitor C4 and inductor L1;

One end of the capacitor C4 is the input end of the filter unit 12, the other end of the capacitor C4 is connected to the output end of the filter unit 12, and the other end of the capacitor C4 is also grounded through the resistor R5, and the inductor L1 is connected in parallel with the capacitor C4.

Preferably, a resistor R3 can be connected in series between the output of the one-way conduction unit 11 and the input of the filter unit 12 for load control.

As an embodiment of the present invention, the near field communication front end hardware circuit may further include:

The load modulation unit 15 is configured to perform load modulation by controlling a load change of the near field coil 2 and transmit a modulation signal that completes the seeding or production configuration, and the load modulation unit 15 is connected to the detection unit 100.

As an embodiment of the invention, the load modulation unit 15 includes:

Switch circuit module 151 and load control module 152;

The first end of the load control module 152 is connected to the output end of the one-way conduction unit 11, the second end of the load control module 152 is connected to the current input end of the switch circuit module 151, and the current output end of the switch circuit module 151 is grounded, and the switch circuit The first control terminal GPIO and the second control terminal TX of the module 151 are respectively connected to the input/output interface GPIO and the transmission signal terminal TX of the micro control unit MCU through the communication interface pin unit 13.

Preferably, the switch circuit module 151 includes:

a second switch tube Q2 and a third switch tube Q3;

The load control module 152 includes:

Resistor R4;

Referring to FIG. 2, as an embodiment of the present invention, the near field communication front end hardware circuit further includes:

The back-end matching unit 14 is configured to perform decision matching on the original modulated signal, and output the matched signal to the micro-control unit MCU through the communication interface pin unit 13, and the back-end matching unit 14 is connected to the detecting unit 100 and the communication interface. Between the foot units 13.

The backend matching unit 14 can be implemented by using a comparison discriminating unit or an AD sampling unit.

Specifically, the comparison discriminating unit includes:

Comparator U1 and resistor R2, resistor R3;

The forward input terminal of the comparator U1 is connected to the output terminal of the filter unit 12, the inverting input terminal of the comparator U1 is grounded through the resistor R2, and the inverting input terminal of the comparator U1 is also connected to the input and output of the micro control unit MCU through the resistor R3. The interface is connected, and the output of the comparator U1 is connected to the receiving signal end of the micro control unit MCU.

The embodiment of the invention realizes seed or production configuration by using a near-field communication front-end hardware circuit built on a discrete device, which does not need to set a contact in the OTP card, does not require secondary packaging, and can be realized only by wireless communication, thereby avoiding The existing OTP card has a complicated process step caused by secondary packaging, a long product cycle and a high cost.

FIG. 8 is a schematic structural diagram of a method for granting seed or production configuration of a dynamic token according to an embodiment of the present invention. For convenience of description, only parts related to the present invention are shown.

The method for granting seed or production configuration of the dynamic token is based on the near field communication front end hardware circuit implementation in the above embodiment, and includes the following steps:

Step S101, receiving seed or production configuration data sent by the reader/writer;

The reader provides a carrier signal when the reader sends seed or production configuration data to the OTP card. The reader/writer modulates the carrier signal by ASK (Amplitude Shift Keying Modulation) or OOK (Open Key Control) according to the transmission information. Of course, the reader can also adjust the carrier frequency by indirect deviation from the matching frequency of the coil. Achieve the equivalent effect of amplitude modulation. It should be pointed out that the transmitted information may be an existing standard interface signal, such as UART, IIC, SPI, single-line transmission protocol, etc., or may be a customized low-speed modulation, amplitude modulation, etc., and the waveform of the signal may be Rectangular, sine, triangle, or custom waveforms.

Step S102, filtering the seed or production configuration data through the detection unit to filter the carrier signal of the modulated signal, to obtain the original modulated signal, and outputting the original modulated signal to the micro control unit through the communication interface pin unit;

Among them, the communication interface pin unit includes an RX pin. Assuming that the standard interface signal is a UART signal, it is output to the micro control unit MCU through the RX pin and the UART interface. Since the received modulated signal does not need to be processed, the back-end reception processing process is greatly simplified, and the transparent transmission effect is achieved.

In step S103, the reader/writer is informed of the completion of the seeding or production configuration.

As a preferred embodiment of the present invention, the seed or the production configuration data may be encrypted. Specifically, before step S101: preset a dynamic encryption password negotiated with the reader/writer;

After step S101: verifying whether the dynamic encryption password carried in the seed or production configuration data is consistent with the preset dynamic encryption password;

If yes, proceed to step S102;

If no, no action or error message is given.

In the embodiment of the present invention, in order to be more secure, before the communication, the dynamic token and the reader/writer first perform one-way or two-way authentication, and then perform communication after the authentication is passed.

As a preferred embodiment of the present invention, in step S103, the step of outputting the original modulated signal to the micro control unit through the communication interface pin unit may be specifically as follows:

Step S1031: output the original modulated signal to the backend matching unit for decision matching;

In step S1032, the matched signal is output to the micro control unit through the communication interface pin unit.

Optionally, in step S1031, the original modulation signal may be subjected to decision conversion according to the amplitude threshold to implement a decision matching;

It is also possible to perform the decision matching by performing AD sampling on the original modulated signal and generating a sample value according to the voltage amplitude value read out by the sampling.

As a preferred embodiment of the present invention, step S103 can directly obtain a signal for completing the seeding or production configuration from the micro control unit to the reader through the communication interface pin unit:

Step S103 can also obtain the signal for completing the seeding or production configuration directly from the micro control unit through the communication interface pin unit, and perform load modulation to transmit the modulation signal for completing the seeding or production configuration to the reader/writer.

In the embodiment of the present invention, the micro switch unit can control the switch circuit module in the load modulation unit to be in an off state by the switch signal, so that the current of the near field communication antenna formed by the near field coil and the matching capacitor is less. When the non-connected front end B is in the receiving state, the switching circuit module or the switching device is in the off state. At this time, the near field communication antenna has a large equivalent impedance, the passing current is small, the low power consumption state is maintained, and the radio frequency energy is hardly consumed. When there are multiple near-field coils on the same circuit board, the OTP card consumes almost no RF energy, which avoids the influence on other communication coils.

As an embodiment of the present invention, at a reader side, a card reader-based card reader or a write-to-production configuration of a dynamic token includes:

Step S201, modulating the seed or production configuration data by using a carrier to generate transmission information, where the transmission information includes: a standard interface signal or a customized low-speed modulation or amplitude modulation modulation signal;

Step S202: Send the sending information to the dynamic token through the communication interface pin unit, so that the dynamic token completes the seeding or production configuration.

Step S203, receiving and demodulating the notification signal of the completion seeding or production configuration of the dynamic token transmission.

It should be understood that the size of the sequence of the steps in the above embodiments does not imply a sequence of executions, and the order of execution of the processes should be determined by its function and internal logic, and should not be construed as limiting the implementation of the embodiments of the present invention.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the division of each functional unit and module described above is exemplified. In practical applications, the above functions may be assigned to different functional units as needed. The module is completed by dividing the internal structure of the device into different functional units or modules to perform all or part of the functions described above. Each functional unit and module in the embodiment may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit, and the integrated unit may be hardware. Formal implementation can also be implemented in the form of software functional units. In addition, the specific names of the respective functional units and modules are only for the purpose of facilitating mutual differentiation, and are not intended to limit the scope of protection of the present application. For the specific working process of the unit and the module in the foregoing system, reference may be made to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the above embodiments, the descriptions of the various embodiments are different, and the parts that are not detailed or described in a certain embodiment can be referred to the related descriptions of other embodiments.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

In the embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the system embodiment described above is merely illustrative. For example, the division of the module or unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be used. Combinations can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the embodiments of the present invention may contribute to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage. The medium includes a plurality of instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), and a random access memory (RAM, Random Access). A variety of media that can store program code, such as a memory, a disk, or an optical disk.

The embodiments described above are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that The technical solutions described in the examples are modified, or some of the technical features are equivalently replaced; and the modifications or substitutions do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in Within the scope of protection of the present invention.

Claims

A near field communication front end hardware circuit, wherein the near field communication front end hardware circuit comprises:

Near field communication antenna, detection unit and communication interface pin unit;

The near field communication antenna includes a near field coil and a matching capacitor, and a frequency of the near field coil matches a selected carrier frequency;

The detecting unit is configured to filter a carrier in the received modulated signal to obtain an original modulated signal, and the detecting unit is connected to the near field coil;

The communication interface pin unit is configured to output the original modulation signal to a micro control unit, and the communication interface pin unit is connected between the detection unit and the micro control unit.
The near field communication front end hardware circuit according to claim 1, wherein the detecting unit is configured to filter the received seed or the carrier in the production configuration data to obtain an original modulated signal, and correspondingly, the communication interface is cited. a foot unit for outputting the original modulated signal to a micro control unit, the communication interface pin unit being connected between an output end of the detecting unit and an input/output pin of the micro control unit.
The near field communication front end hardware circuit according to claim 1 or 2, wherein the near field communication front end hardware circuit further comprises:

a back-end matching unit, configured to perform a decision matching on the original modulated signal, and output the matched signal to the micro-control unit through the communication interface pin unit, where the back-end matching unit is connected to the detection Between the unit and the communication interface pin unit.
The near field communication front end hardware circuit according to claim 3, wherein the back end matching unit comprises:

The backend matching unit is a comparison discriminating unit or an AD sampling unit.
The near field communication front end hardware circuit according to claim 4, wherein the comparison determining unit comprises:

Comparator and resistor R2, resistor R3;

a forward input end of the comparator is connected to an output end of the filter unit, an inverting input end of the comparator is grounded through the resistor R2, and an inverting input end of the comparator further passes through the resistor R3 Connected to an input/output interface of the micro control unit, and an output end of the comparator is connected to a receiving signal end of the micro control unit;

The AD sampling unit is an analog to digital converter.
The near field communication front end hardware circuit according to any one of claims 1 to 3 or 4, wherein the near field communication front end hardware circuit further comprises a load modulation unit;

The load modulation unit is configured to perform load modulation and transmit a modulation signal by controlling a load change of the near field coil, and the load modulation unit is connected to the detection unit.
The near field communication front end hardware circuit according to claim 6, wherein the load modulation unit comprises:

a switch circuit module and a load control module;

a first end of the load control module is connected to the detecting unit, a second end of the load control module is connected to a current input end of the switch circuit module, and a current output end of the switch circuit module is grounded, The first control end and the second control end of the switch circuit module are respectively connected to the input/output interface and the transmit signal end of the micro control unit through the communication interface pin unit.
The near field communication front end hardware circuit according to claim 2, wherein the detecting unit comprises a unidirectional conduction unit and a filtering unit;

The one-way conduction unit is a diode, a triode or a MOS tube;

The filtering unit includes:

Resistor R2 and capacitor C2;

One end of the resistor R2 is connected to an input end of the filtering unit and an output end of the unidirectional conduction unit, and an input end of the unidirectional conduction unit is connected to the near field coil, and one end of the resistor R2 is simultaneously An output end of the filtering unit is connected to one end of the capacitor C2, and one end of the capacitor C2 is connected to an output end of the filtering unit and the communication interface pin unit, and the other end of the resistor R2 is The other end of the capacitor C2 is grounded at the same time;

Or, the filtering unit includes:

Resistor R5, capacitor C4 and inductor L1;

One end of the capacitor C4 is connected to the input end of the filtering unit, and the other end of the capacitor C4 is connected to the input end of the single-conducting unit. The output end of the unidirectional conduction unit is connected to the communication interface pin unit, and the other end of the capacitor C4 is also grounded through the resistor R5, and the inductor L1 is connected in parallel with the capacitor C4.
The near field communication front end hardware circuit according to claim 8, wherein the near field communication front end hardware circuit further comprises a load modulation unit;

The load modulation unit is configured to perform load modulation by controlling a load change of the near field coil and transmit a modulation signal that completes a seeding or production configuration, and the load modulation unit is connected to the detection unit.
The near field communication front end hardware circuit according to claim 9, wherein the load modulation unit comprises:

a switch circuit module and a load control module;

a first end of the load control module is connected to an output end of the single-conducting unit, a second end of the load control module is connected to a current input end of the switch circuit module, and a current output of the switch circuit module The first control end and the second control end of the switch circuit module are respectively connected to the input/output interface and the transmit signal end of the micro control unit through a communication interface pin unit.
A near field communication terminal, characterized in that the front end hardware circuit of the near field communication terminal comprises the near field communication front end hardware circuit according to any one of claims 1 or 3 or 4 or 6 or 7.
A reader/writer, characterized in that the front end hardware circuit of the reader/writer includes the near field communication front end hardware circuit according to claim 1 or 3 or 4.
A near field wireless communication system, characterized in that the near field wireless communication system comprises the near field communication terminal according to claim 11 and the reader/writer according to claim 12.
A dynamic token, characterized in that the dynamic token comprises or the dynamic token comprises a near field communication front end hardware circuit according to any one of claims 2 or 3 or 5 or 8 or 9 or 10 .
A card reader, characterized in that the front end hardware circuit of the card reader comprises the near field communication front end hardware circuit according to any one of claims 2 or 3 or 5 or 8.
An OTP near field communication system, characterized in that the system comprises the dynamic token of claim 14 and the card reader of claim 15.
A method for seed or production configuration of a dynamic token, the method being based on the dynamic token of claim 14, the method comprising:

Receiving seed or production configuration data sent by the reader/writer;

Filtering off the seed signal in the seed or production configuration data by the detecting unit to obtain an original modulated signal;

Outputting the original modulated signal to the micro control unit through the communication interface pin unit;

Tell the reader that the seeding or production configuration is complete.
The method according to claim 17, wherein the step of outputting the original modulated signal to the micro control unit through the communication interface pin unit is specifically:

Outputting the original modulated signal to a backend matching unit for decision matching;

The matched signal is output to the micro control unit through the communication interface pin unit.
The method of claim 18, wherein the decision is performed by performing a decision conversion on the original modulated signal according to an amplitude threshold; or

The decision matching is performed by performing AD sampling on the original modulated signal and generating a sample value according to the voltage amplitude value read out by the sampling.
The method of claim 17, wherein the step of notifying the reader that the seeding or production configuration is completed is:

After the micro control unit responds to the original modulated signal to generate a response signal, the load modulation unit is controlled according to the response signal, and the load modulation unit controls the load change of the near field coil to perform load modulation;

The modulated response signal is sent to the reader/writer.
A method for a card reader to seed or write a production configuration to a dynamic token, the method being based on the card reader of claim 15, the method comprising:

The seed or production configuration data is modulated by a carrier to generate transmission information, where the transmission information includes: a standard interface signal or a customized low-speed modulation or amplitude modulation modulation signal;

Transmitting the sending information to the dynamic token through the communication interface pin unit, so that the dynamic token completes seeding or production configuration;

Receiving and demodulating the notification signal of the completed seeding or production configuration of the dynamic token transmission.
A near field wireless communication method based on a near field communication front end hardware circuit, comprising:

Receiving a modulated signal transmitted by a reader/writer through a near field communication antenna, the near field communication antenna including a near field coil and a matching capacitor;

Filtering the carrier of the modulated signal by the detecting unit to obtain an original modulated signal;

The original modulated signal is output to the micro control unit through the communication interface pin unit.
The near field wireless communication method according to claim 22, wherein the outputting the original modulated signal to the MCU circuit through a first communication interface pin comprises:

Outputting the original modulated signal to a backend matching unit for matching;

And matching the signal matched by the backend matching unit to the micro control unit through the communication interface pin unit.
The near field wireless communication method according to claim 22, after the outputting the original modulated signal to the micro control unit through the communication interface pin unit, comprising:

After the micro control unit responds to the original modulated signal to generate a response signal, the load modulation unit is controlled according to the response signal, and the load modulation unit controls the load change of the near field coil to perform load modulation;

The modulated response signal is sent to the reader/writer.
The near field wireless communication method according to claim 22, wherein the load modulation unit comprises a switch circuit module, and when the modulated signal transmitted by the reader/writer is received by the near field communication antenna, the method includes:

The switch circuit module is controlled to be in an off state such that less current is passed through the near field communication antenna.
The near-field wireless communication method according to claim 23, wherein the back-end matching unit is a comparison determining unit, and the outputting the original modulated signal to the back-end matching unit for matching comprises:

Outputting the original modulated signal to the comparison determining unit, if the amplitude of the original modulated signal exceeds a preset amplitude threshold, the comparison determining unit outputs a high level; otherwise, outputs a low level;

or,

The back-end matching unit is an AD sampling unit. In this case, the outputting the original modulated signal to the back-end matching unit, including:

Outputting the original modulated signal to an AD sampling unit, where the AD sampling unit determines a voltage amplitude value of the original modulated signal, and if the voltage amplitude value exceeds a preset voltage amplitude threshold, outputs 1; otherwise, outputs 0. .
A near field wireless communication method based on a near field communication front end hardware circuit, comprising:

Modulating the carrier according to the transmitted information to obtain a modulated signal;

The modulated signal is transmitted to the near field communication terminal through the communication interface pin unit to cause the near field communication terminal to receive the modulated signal through the near field communication antenna.
The near field wireless communication method according to claim 27, wherein said modulating signal is transmitted to a near field communication terminal through a communication interface pin unit to cause said near field communication terminal to pass a near field communication antenna After receiving the modulated signal, the method includes:

Receiving, by the near field communication antenna, the modulated response signal sent by the near field communication terminal, where the response signal is generated by the micro control unit of the near field communication terminal responding to the received original modulated signal;

Filtering, by the detecting unit, a carrier of the modulated response sent by the near field communication terminal;

The signal after filtering the carrier is output to the micro control unit through the communication interface pin unit.