CN106022420A - NFC read-write circuit - Google Patents
NFC read-write circuit Download PDFInfo
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- CN106022420A CN106022420A CN201610596307.1A CN201610596307A CN106022420A CN 106022420 A CN106022420 A CN 106022420A CN 201610596307 A CN201610596307 A CN 201610596307A CN 106022420 A CN106022420 A CN 106022420A
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- Prior art keywords
- electric capacity
- circuit
- inductance
- ground
- main control
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device
- G06K17/0029—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device the arrangement being specially adapted for wireless interrogation of grouped or bundled articles tagged with wireless record carriers
Abstract
The invention relates to an NFC read-write circuit, which is characterized by comprising an induction and identification circuit, a main control circuit and a power supply circuit, wherein the induction and identification circuit is connected with the main control circuit, and the power supply circuit is respectively connected with the induction and identification circuit, a switch circuit and the main control circuit and provides power for the induction and identification circuit, the switch circuit and the main control circuit. The NFC read-write circuit overcomes potential safety hazards existing in a mode of identifying a user by two-dimensional code scanning in the prior art for the capital of the user, the safety of capital transactions of the user is ensured under the condition of not affecting the user experience, and the safety performance is extremely high. In addition, the NFC read-write circuit is very high in read-write response speed, low in cost, excellent in performance and very suitable for large-area popularization.
Description
Technical field
The present invention relates to NFC communication technical field, particularly relate to a kind of NFC read/write circuit.
Background technology
At present, the mobile payment on market is more and more universal, and in mobile payment, is largely divided into two dimension
Code, sound wave pay and NFC pays three kinds, wherein, occupy the biggest ratio in the way of Quick Response Code payment
Example, user has only to be displayed by Quick Response Code or utilize the APP of mobile phone to sweep to sweep and can complete to hand over
Easily.But, while convenient payment, the fund of user but receives huge challenge, because two-dimentional
Code book body does not comprise the encrypted message of user, and the successful realization of transaction simply needs one can resolve two
The machine of dimension code information, it is not necessary to the password authentification of user, thus significantly increase the illegal of fund
The probability of transfer.
For this reason, it may be necessary to the mode of current mobile payment has been done further improvement, do not affecting user
In the case of experience, it is ensured that the safety of user's funds transaction.
Summary of the invention
The technical problem to be solved is for above-mentioned the deficiencies in the prior art, it is provided that a kind of NFC
Read/write circuit.
The technical scheme is that a kind of NFC read/write circuit, its feature
It is: include sensing identification circuit, main control circuit and power circuit；Described sensing identification circuit and institute
Stating main control circuit to connect, described power circuit connects with described sensing identification circuit and main control circuit respectively
Connect and provide power supply for it.
The invention has the beneficial effects as follows: a kind of NFC read/write circuit of the present invention, overcome in prior art
The potential safety hazard that scanning Quick Response Code identification user this mode user's fund exists, is not affecting Consumer's Experience
In the case of, it is ensured that the safety of user's funds transaction, security performance is high, and the read-write phase of circuit
Answer speed quickly, with low cost, better performances, it is especially suitable for spread.
On the basis of technique scheme, the present invention can also do and improve as follows:
Further: described sensing identification circuit includes impedance matching circuit and rfid circuit, described resistance
Anti-match circuit is connected with described rfid circuit.
Above-mentioned further scheme provides the benefit that: can be to nfc card by described sensing identification circuit
ID serial number effectively identifies, and the result after identifying sends to described main control circuit, by described
Main control circuit is verified, and is written and read after being verified, and recognition efficiency is higher, and the time is shorter,
Response is fast.
Further: described impedance matching circuit include resistance R1, R2, electric capacity C1, C2, C4, C5,
C6, C10, C11, C13, C16, C17 and connection seat P2.
Wherein, described resistance R1, electric capacity C2 and electric capacity C6 are in sequential series at the 1 of described adapter P2
Number between pin and ground, described resistance R2, electric capacity C17 and electric capacity C13 are in sequential series at described adapter
No. 3 of P2, between pin and ground, are connected to described resistance R1 after described electric capacity C4 and electric capacity C10 series connection
And between the common port of the common port of electric capacity C2 and resistance R2 and electric capacity C17, described electric capacity C5 and electricity
Common port and resistance R2 and the electric capacity C17 of described resistance R1 and electric capacity C2 it is connected to after holding C11 series connection
Common port between, and the public affairs of No. 2 pins of described adapter P2, described electric capacity C4 and electric capacity C10
End and the equal ground connection of common port of described electric capacity C5 and electric capacity C11 altogether, described electric capacity C1 is connected in parallel on described electricity
Holding the two ends of C2, described electric capacity C16 is connected in parallel on the two ends of described electric capacity C17, described electric capacity C2 and electricity
The common port of the common port and described electric capacity C17 and electric capacity C13 that hold C6 is connected with radio circuit respectively.
Above-mentioned further scheme provides the benefit that: by described impedance matching circuit can to nfc card with
Described radio circuit carries out impedance matching, filters out useful induced signal, filtering interference signals, convenience
Described radio circuit effectively identifying, verify and reading and writing described nfc card, recognition efficiency is higher, the time
Shorter, response is fast.
It is further: described sensing identification circuit includes also including the first filter circuit and the second filter circuit,
Described first filter circuit and the second filter circuit are connected with described radio circuit respectively.
Above-mentioned further scheme provides the benefit that: by described first filter circuit and the second filter circuit
The clutter composition in the signal of telecommunication that described power circuit provides can be filtered so that be supplied to described radio frequency electrical
The signal on road does not exist interference component, facilitates the effective identification to nfc card of the described radio circuit, improve
The accuracy rate identified and corresponding rapidity.
Further: described first filter circuit includes inductance L1 and electric capacity C7, C8, C9, described electric capacity
C7 is connected between power supply VCC and ground, between power supply VCC and ground in sequential series have described inductance L1 and
Electric capacity C8, and the common port of described inductance L1 and electric capacity C8 is connected with described radio circuit, described electric capacity
C9 is connected in parallel on described electric capacity C8 two ends；Described second filter circuit include inductance L6 and electric capacity C33, C34,
C35, described electric capacity C33 is connected between power supply VCC and ground, in sequential series between power supply VCC and ground
There is a described inductance L6 and electric capacity C34, and the common port of described inductance L6 and electric capacity C34 and described radio frequency
Circuit connects, and described electric capacity C35 is connected in parallel on described electric capacity C34 two ends.
Further: described main control circuit include Master control chip U3, resistance R4, electric capacity C21, C22,
C23, C24, C25, switch S1 and crystal oscillator Y1, Y2.The clock signal of described Master control chip U3 is defeated
Enter to hold to connect between OSC_IN and outfan OSC_OUT and have described crystal oscillator Y1, described electric capacity C21 and electricity
It is connected in parallel on described crystal oscillator Y1 two ends after holding C23 series connection, and described electric capacity C21's and electric capacity C23 is public
End ground connection；The clock signal input terminal OSC32_IN and outfan OSC32_OUT of described Master control chip U3
Between connect have described crystal oscillator Y2, described electric capacity C22 and electric capacity C24 series connection after be connected in parallel on described crystal oscillator
Y2 two ends, and described electric capacity C22 and the common end grounding of electric capacity C24；Described Master control chip U3's
It is connected between the RESET input NRST and ground and has described electric capacity C25, and the answering of described Master control chip U3
Position input NRST is connected with power circuit also by described resistance R4, and described switch S1 is connected in parallel on institute
Stating electric capacity C25 two ends, described Master control chip U3 is connected with power circuit.
Above-mentioned further scheme provides the benefit that: can be known described sensing by described main control circuit
The serial number of the nfc card of other circuit identification is read out, and verifies, reads NFC after being verified
Content in card, and carry out secondary checking, after secondary is verified, nfc card correspondence is stored in backstage
Data content be written and read, security performance is high, it is not easy to be cracked and mountain vallage.
Further: described power circuit includes DC adapter J2, switch S2, diode D4, electric capacity
C29, C30, C31, C32, voltage conversion chip U6 and voltage stabilizing chip U5, described DC adapter J2
No. 1 pin be connected with the positive pole of described diode D4, No. 2 pins and No. 3 equal ground connection of pin, described
The negative pole of diode D4 is connected with the input of described voltage conversion chip U6 by described switch S2,
The earth terminal ground connection of described voltage conversion chip U6, and the input of voltage conversion chip U6 and earth terminal
Between connect have described electric capacity C30, the outfan of described voltage conversion chip U6 pass through described electric capacity C32
Ground connection, described electric capacity C31 is connected in parallel on described electric capacity C32 two ends, described voltage conversion chip U6 defeated
Going out the end input also with described voltage stabilizing chip U5 to be connected, the outfan of described voltage stabilizing chip U5 passes through institute
State electric capacity C29 ground connection, and the outfan of voltage stabilizing chip U5 also with described sensing identification circuit and main control
Circuit connects, the earth terminal ground connection of described voltage stabilizing chip U5.
Above-mentioned further scheme provides the benefit that: the electricity that can be provided outside by described power circuit
Source carries out voltage conversion and voltage stabilizing, it is simple to provide stable for described sensing identification circuit and main control circuit
Power supply.
Further: also to include that stand-by power supply circuit, described stand-by power supply circuit include diode D2, two poles
Pipe D3, electric capacity C18 and battery Battery, the positive pole of described diode D2 and described power circuit
Outfan connects, and negative pole passes through described electric capacity C18 ground connection, and the negative pole of described diode D2 and described
The common port of electric capacity C18 is connected with described rfid circuit, and the negative pole of described diode D3 is with described
The negative pole of diode D2 connects, and positive pole is connected with the positive pole of described battery Battery, described battery
The minus earth of Battery.
Above-mentioned further scheme provides the benefit that: can be in outside by arranging described stand-by power supply circuit
Power supply occurs providing stand-by power supply for whole circuit when power-off or other abnormal conditions, adds whole circuit
The stability worked in abnormal cases, still can normally work, especially in the case of outside power-off
It is the place not having out of doors etc. power supply, considerably increases range of application.
Further: also to include that the 3rd filter circuit, described 3rd filter circuit include inductance L2, inductance
L3 and electric capacity C12, one end of described inductance L2 is connected with the outfan of described power circuit, the other end
And in sequential series between ground have described electric capacity C12 and inductance L3, and described inductance L2 and described electric capacity C12
Common port be connected with described main control circuit, described C12 and the common end grounding of inductance L3.
Above-mentioned further scheme provides the benefit that: can be effectively to described by described 3rd filter circuit
Power circuit, by filtering to the signal of described main control circuit, removes the impurity component in signal,
Only retain effective signal component, the stability of main control circuit, and main control circuit can be greatly improved
The accuracy of reading and writing data.
Accompanying drawing explanation
Fig. 1 is a kind of NFC read/write circuit structural representation of the present invention；
Fig. 2 is a kind of NFC read/write circuit middle impedance match circuit figure of the present invention；
Fig. 3 be the present invention a kind of NFC read/write circuit in rfid circuit figure；
Fig. 4 be the present invention a kind of NFC read/write circuit in the first filter circuit；
Fig. 5 be the present invention a kind of NFC read/write circuit in the second filter circuit figure；
Fig. 6 be the present invention a kind of NFC read/write circuit in main control circuit figure；
Fig. 7 be the present invention a kind of NFC read/write circuit in power circuit diagram；
Fig. 8 be the present invention a kind of NFC read/write circuit in stand-by power supply circuit diagram；
Fig. 9 be the present invention a kind of NFC read/write circuit in the 3rd filter circuit figure.
Detailed description of the invention
Being described principle and the feature of the present invention below in conjunction with accompanying drawing, example is served only for explaining this
Invention, is not intended to limit the scope of the present invention.
As it is shown in figure 1, a kind of NFC read/write circuit, including sensing identification circuit, main control circuit and electricity
Source circuit；Described sensing identification circuit is connected with described main control circuit, described power circuit respectively with institute
State sensing identification circuit and main control circuit connects and provides power supply for it.
Wherein, described sensing identification circuit includes impedance matching circuit and rfid circuit, described impedance
Match circuit is connected with described rfid circuit.
As in figure 2 it is shown, in the present embodiment, described impedance matching circuit includes resistance R1, R2, electric capacity
C1, C2, C4, C5, C6, C10, C11, C13, C16, C17 and connection seat P2.
Wherein, described resistance R1, electric capacity C2 and electric capacity C6 are in sequential series at the 1 of described adapter P2
Number between pin and ground, described resistance R2, electric capacity C17 and electric capacity C13 are in sequential series at described adapter
No. 3 of P2, between pin and ground, are connected to described resistance R1 after described electric capacity C4 and electric capacity C10 series connection
And between the common port of the common port of electric capacity C2 and resistance R2 and electric capacity C17, described electric capacity C5 and electricity
Common port and resistance R2 and the electric capacity C17 of described resistance R1 and electric capacity C2 it is connected to after holding C11 series connection
Common port between, and the public affairs of No. 2 pins of described adapter P2, described electric capacity C4 and electric capacity C10
End and the equal ground connection of common port of described electric capacity C5 and electric capacity C11 altogether, described electric capacity C1 is connected in parallel on described electricity
Holding the two ends of C2, described electric capacity C16 is connected in parallel on the two ends of described electric capacity C17, described electric capacity C2 and electricity
The common port of the common port and described electric capacity C17 and electric capacity C13 that hold C6 is connected with radio circuit respectively.
Nfc card and described radio circuit can be carried out impedance matching by described impedance matching circuit, sieve
Select useful induced signal, filtering interference signals, facilitate described radio circuit that described nfc card is had
Effect identifies, verifies and read and write, and recognition efficiency is higher, and the time is shorter, and response is fast.
As it is shown on figure 3, in the present embodiment, described rfid circuit includes radio frequency chip U1, electric capacity
C14, C15, C19, C20, C26, C27, C28, C36, C37, inductance L4, inductance L5, inductance
L6, inductance L7, resistance R5, resistance R6 and crystal oscillator Y3.
The radiofrequency signal transmitting terminal TX1 of described radio frequency chip U1 is by described inductance L6 and described electric capacity C2
Being connected with the common port of electric capacity C6, the radiofrequency signal transmitting terminal TX2 of described radio frequency chip U1 is by described
Inductance L7 is connected with the common port of described electric capacity C17 and electric capacity C13, the reference of described radio frequency chip U1
Ground end VMID by described electric capacity C28 ground connection, reference of described radio frequency chip U1 end VMID with penetrate
Frequently be also sequentially connected with described resistance R5 and electric capacity C27 between signal receiving end, and described resistance R5 and
The common port of electric capacity C27 is by the common port of described resistance R6 and described electric capacity C17 and electric capacity C13 even
Connect.
The power input DVDD of described radio frequency chip U1 is connected with power supply VCC by inductance L4, institute
Stating electric capacity C14, C15, C26 to be both connected between power supply VCC and ground, described electric capacity C19, C20 are equal
It is connected between power input DVDD and the ground of described radio frequency chip U1, described radio frequency chip U1's
Power input SVDD is connected with power supply VCC by described inductance L5, the electricity of described radio frequency chip U1
Source input PVDD is connected with power supply VCC.
Clock signal input terminal XTAL1 Yu XTAL2 of described radio frequency chip U1 is respectively by described electric capacity
C36 and electric capacity C37 ground connection, and described crystal oscillator Y3 to be connected to the clock signal of described radio frequency chip U1 defeated
Enter to hold between XTAL1 and clock signal output terminal XTAL2.
The signal sending end TX and receiving terminal RX of described radio frequency chip U1 respectively with described main control circuit
Connecting, the interrupt requests outfan IRQ of described radio frequency chip U1 is connected with described main control circuit.
In the moment that nfc card is close, described impedance matching circuit can be known by described rfid circuit
Other nfc card ID serial number effectively identifies, wakes up described main control electricity up by interrupt signal simultaneously
Road, and the result after identifying sends to described main control circuit, treats that the read-write of described main control circuit terminates
After automatically into sleep state, energy-conserving and environment-protective, green low-carbon.
In the present embodiment, described radio frequency chip U1 selects model to be the chip of PN532.
As shown in Figure 4,5, it is preferable that described sensing identification circuit includes also including the first filter circuit
With the second filter circuit, described first filter circuit and the second filter circuit are respectively with described radio circuit even
Connect.
Can filter what described power circuit provided by described first filter circuit and the second filter circuit
Clutter composition in the signal of telecommunication so that be supplied in the signal of described radio circuit not exist interference component,
Facilitate the effective identification to nfc card of the described radio circuit, improve the accuracy rate and corresponding rapidity identified.
As shown in Figure 4,5, described first filter circuit includes inductance L1 and electric capacity C7, C8, C9, institute
Stating electric capacity C7 to be connected between power supply VCC and ground, in sequential series between power supply VCC and ground have described electricity
Feel L1 and electric capacity C8, and the common port of described inductance L1 and electric capacity C8 be connected with described radio circuit,
Described electric capacity C9 is connected in parallel on described electric capacity C8 two ends；Described second filter circuit includes inductance L6 and electricity
Holding C33, C34, C35, described electric capacity C33 is connected between power supply VCC and ground, power supply VCC and ground
Between in sequential series have a described inductance L6 and electric capacity C34, and described inductance L6's and electric capacity C34 is public
End is connected with described radio circuit, and described electric capacity C35 is connected in parallel on described electric capacity C34 two ends.
As shown in Figure 6, in the present embodiment, described main control circuit includes Master control chip U3, resistance
R4, electric capacity C21, C22, C23, C24, C25, switch S1 and crystal oscillator Y1, Y2.Described main control
Connect between the clock signal input terminal OSC_IN and outfan OSC_OUT of chip U3 and have described crystal oscillator
It is connected in parallel on described crystal oscillator Y1 two ends, and described electric capacity after Y1, described electric capacity C21 and electric capacity C23 series connection
C21 and the common end grounding of electric capacity C23；The clock signal input terminal of described Master control chip U3
Connect between OSC32_IN and outfan OSC32_OUT and have described crystal oscillator Y2, described electric capacity C22 and electricity
It is connected in parallel on described crystal oscillator Y2 two ends after holding C24 series connection, and described electric capacity C22's and electric capacity C24 is public
End ground connection；It is connected between the RESET input NRST and the ground of described Master control chip U3 and has described electric capacity
C25, and the RESET input NRST of described Master control chip U3 is also by described resistance R4 and power supply electricity
Road connects, and described switch S1 is connected in parallel on described electric capacity C25 two ends, described Master control chip U3 and power supply
Circuit connects.
The serial number of the nfc card of described sensing identification circuit identification can be entered by described main control circuit
Row reads, and verifies, reads the content in nfc card, and carry out secondary checking after being verified,
The data content that nfc card correspondence is stored in after secondary is verified backstage is written and read, security performance
High, it is not easy to be cracked and mountain vallage.
In the present embodiment, the ARM microcontroller that described Master control chip selects model to be STM32F103C8T6
Device.
As it is shown in fig. 7, in the present embodiment, described power circuit include DC adapter J2, switch S2,
Diode D4, electric capacity C29, C30, C31, C32, voltage conversion chip U6 and voltage stabilizing chip U5.
Wherein, No. 1 pin of described DC adapter J2 is connected with the positive pole of described diode D4, and 2
Number pin and No. 3 equal ground connection of pin, the negative pole of described diode D4 is by described switch S2 and described electricity
The input of pressure conversion chip U6 connects, the earth terminal ground connection of described voltage conversion chip U6, and voltage
It is connected between the input of conversion chip U6 and earth terminal and has described electric capacity C30, described voltage conversion chip
The outfan of U6 passes through described electric capacity C32 ground connection, and described electric capacity C31 is connected in parallel on described electric capacity C32 two ends,
The outfan of described voltage conversion chip U6 also input with described voltage stabilizing chip U5 is connected, described surely
The outfan of pressure chip U5 by described electric capacity C29 ground connection, and the outfan of voltage stabilizing chip U5 also with institute
State sensing identification circuit and main control circuit connects, the earth terminal ground connection of described voltage stabilizing chip U5.
The power supply that outside provides can be carried out voltage conversion and voltage stabilizing by described power circuit, it is simple to for
Described sensing identification circuit and main control circuit provide stable power supply.
In the present embodiment, described voltage conversion chip U6 selects model to be ASM1117 voltage conversion chip,
Described voltage stabilizing chip U5 selects model to be 662K voltage stabilizing chip.
As shown in Figure 8, it is preferable that a kind of NFC read/write circuit of the present embodiment also includes stand-by power supply electricity
Road, described stand-by power supply circuit includes diode D2, diode D3, electric capacity C18 and battery Battery,
The positive pole of described diode D2 is connected with the outfan of described power circuit, and negative pole passes through described electric capacity C18
Ground connection, and the common port of the negative pole of described diode D2 and described electric capacity C18 is electric with described RF identification
Road connects, and the negative pole of described diode D3 is connected with the negative pole of described diode D2, positive pole and described electricity
The positive pole of pond Battery connects, the minus earth of described battery Battery.
At external power source, power-off or other abnormal conditions can occur by arranging described stand-by power supply circuit
Time for whole circuit provide stand-by power supply, add the stability that whole circuit works in abnormal cases,
Still can normally work in the case of outside power-off, there is no the most out of doors etc. the place of power supply,
Considerably increase range of application.
As shown in Figure 9, it is preferable that a kind of NFC read/write circuit of the present embodiment also includes the 3rd filtered electrical
Road, described 3rd filter circuit includes inductance L2, inductance L3 and electric capacity C12, the one of described inductance L2
End is connected with the outfan of described power circuit, and in sequential series between the other end and ground have described electric capacity C12
With inductance L3, and the common port of described inductance L2 and described electric capacity C12 is connected with described main control circuit,
Described C12 and the common end grounding of inductance L3.
By described 3rd filter circuit can effectively to described power circuit by described main control electricity
The signal on road filters, and removes the impurity component in signal, only retains effective signal component, Ke Yi great
The big stability improving main control circuit, and the accuracy of main control circuit reading and writing data.
A kind of NFC read/write circuit of the present invention, overcome in prior art scan Quick Response Code identification user this
Plant the potential safety hazard that mode user's fund exists, in the case of not affecting Consumer's Experience, it is ensured that Yong Huzi
The safety of gold transaction, security performance is high, and the read-write corresponding speed of circuit is quickly, with low cost,
Better performances, is especially suitable for spread.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all in the present invention
Spirit and principle within, any modification, equivalent substitution and improvement etc. made, should be included in this
Within bright protection domain.
Claims (9)
1. a NFC read/write circuit, it is characterised in that: include sensing identification circuit, main control circuit
And power circuit；
Described sensing identification circuit is connected with described main control circuit, described power circuit respectively with described sense
Identification circuit and main control circuit is answered to connect and provide power supply for it.
A kind of NFC read/write circuit, it is characterised in that: described sensing is known
Other circuit includes that impedance matching circuit and rfid circuit, described impedance matching circuit are known with described radio frequency
Other circuit connects.
A kind of NFC read/write circuit, it is characterised in that: described impedance
Distribution road include resistance R1, R2, electric capacity C1, C2, C4, C5, C6, C10, C11, C13, C16,
C17 and connection seat P2；
Described resistance R1, electric capacity C2 and electric capacity C6 No. 1 pin at described adapter P2 in sequential series
And between ground, described resistance R2, electric capacity C17 and electric capacity C13 are in sequential series described adapter P2's
No. 3, between pin and ground, are connected to described resistance R1 and electricity after described electric capacity C4 and electric capacity C10 series connection
Hold between common port and the common port of resistance R2 and electric capacity C17 of C2, described electric capacity C5 and electric capacity C11
The public of described resistance R1 and the common port of electric capacity C2 and resistance R2 and electric capacity C17 it is connected to after series connection
Between end, and the common port of No. 2 pins of described adapter P2, described electric capacity C4 and electric capacity C10 and
The equal ground connection of common port of described electric capacity C5 and electric capacity C11；
Described electric capacity C1 is connected in parallel on the two ends of described electric capacity C2, and described electric capacity C16 is connected in parallel on described electric capacity
The two ends of C17, the common port of described electric capacity C2 and electric capacity C6 and described electric capacity C17 and electric capacity C13's
Common port is connected with radio circuit respectively.
A kind of NFC read/write circuit, it is characterised in that: described sensing is known
Other circuit includes also including the first filter circuit and the second filter circuit, described first filter circuit and second
Filter circuit is connected with described radio circuit respectively.
A kind of NFC read/write circuit, it is characterised in that: described first filter
Wave circuit includes that inductance L1 and electric capacity C7, C8, C9, described electric capacity C7 are connected to power supply VCC and ground
Between, in sequential series between power supply VCC and ground have described inductance L1 and electric capacity C8, and described inductance L1
Being connected with described radio circuit with the common port of electric capacity C8, described electric capacity C9 is connected in parallel on described electric capacity C8
Two ends；
Described second filter circuit includes inductance L6 and electric capacity C33, C34, C35, described electric capacity C33
Being connected between power supply VCC and ground, in sequential series between power supply VCC and ground have described inductance L6 and electricity
Hold C34, and the common port of described inductance L6 and electric capacity C34 is connected with described radio circuit, described electric capacity
C35 is connected in parallel on described electric capacity C34 two ends.
A kind of NFC read/write circuit, it is characterised in that: described main control
Circuit includes Master control chip U3, resistance R4, electric capacity C21, C22, C23, C24, C25, switch
S1 and crystal oscillator Y1, Y2；
Connect between the clock signal input terminal OSC_IN and outfan OSC_OUT of described Master control chip U3
It is connected in parallel on described crystal oscillator Y1 two ends after being connected to described crystal oscillator Y1, described electric capacity C21 and electric capacity C23 series connection,
And described electric capacity C21 and the common end grounding of electric capacity C23；
The clock signal input terminal OSC32_IN and outfan OSC32_OUT of described Master control chip U3 it
Between connect have described crystal oscillator Y2, described electric capacity C22 and electric capacity C24 series connection after be connected in parallel on described crystal oscillator Y2
Two ends, and described electric capacity C22 and the common end grounding of electric capacity C24；
It is connected between the RESET input NRST and the ground of described Master control chip U3 and has described electric capacity C25,
And the RESET input NRST of described Master control chip U3 is also by described resistance R4 with power circuit even
Connecing, described switch S1 is connected in parallel on described electric capacity C25 two ends, described Master control chip U3 and power circuit
Connect.
A kind of NFC read/write circuit, it is characterised in that: described power supply electricity
Road includes DC adapter J2, switch S2, diode D4, electric capacity C29, C30, C31, C32, electricity
Pressure conversion chip U6 and voltage stabilizing chip U5；
No. 1 pin of described DC adapter J2 is connected with the positive pole of described diode D4, No. 2 pins and
No. 3 equal ground connection of pin, the negative pole of described diode D4 changes core by described switch S2 with described voltage
The input of sheet U6 connects, the earth terminal ground connection of described voltage conversion chip U6, and voltage conversion chip
It is connected between the input of U6 and earth terminal and has described electric capacity C30, described voltage conversion chip U6 defeated
Going out to hold by described electric capacity C32 ground connection, described electric capacity C31 is connected in parallel on described electric capacity C32 two ends, described
The outfan of voltage conversion chip U6 also input with described voltage stabilizing chip U5 is connected, described voltage stabilizing core
The outfan of sheet U5 pass through described electric capacity C29 ground connection, and the outfan of voltage stabilizing chip U5 also with described sense
Identification circuit and main control circuit is answered to connect, the earth terminal ground connection of described voltage stabilizing chip U5.
8. according to NFC read/write circuit a kind of described in any one of claim 1 to 7, it is characterised in that:
Also include that stand-by power supply circuit, described stand-by power supply circuit include diode D2, diode D3, electric capacity
C18 and battery Battery, the positive pole of described diode D2 is connected with the outfan of described power circuit,
Negative pole passes through described electric capacity C18 ground connection, and the negative pole of described diode D2 and the public affairs of described electric capacity C18
End is connected with described rfid circuit altogether, and the negative pole of described diode D3 is negative with described diode D2's
Pole connects, and positive pole is connected with the positive pole of described battery Battery, and the negative pole of described battery Battery connects
Ground.
9. according to NFC read/write circuit a kind of described in any one of claim 1 to 7, it is characterised in that:
Also include that the 3rd filter circuit, described 3rd filter circuit include inductance L2, inductance L3 and electric capacity C12,
One end of described inductance L2 is connected with the outfan of described power circuit, sequentially goes here and there between the other end and ground
It is associated with described electric capacity C12 and inductance L3, and the common port of described inductance L2 and described electric capacity C12 and institute
State main control circuit to connect, described C12 and the common end grounding of inductance L3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610596307.1A CN106022420A (en) | 2016-07-26 | 2016-07-26 | NFC read-write circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610596307.1A CN106022420A (en) | 2016-07-26 | 2016-07-26 | NFC read-write circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106022420A true CN106022420A (en) | 2016-10-12 |
Family
ID=57114671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610596307.1A Pending CN106022420A (en) | 2016-07-26 | 2016-07-26 | NFC read-write circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106022420A (en) |
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Application publication date: 20161012 |