CN101996448A - Application technology of radio-frequency IC MFRC522 to intelligent instrument - Google Patents
Application technology of radio-frequency IC MFRC522 to intelligent instrument Download PDFInfo
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- CN101996448A CN101996448A CN2009100134109A CN200910013410A CN101996448A CN 101996448 A CN101996448 A CN 101996448A CN 2009100134109 A CN2009100134109 A CN 2009100134109A CN 200910013410 A CN200910013410 A CN 200910013410A CN 101996448 A CN101996448 A CN 101996448A
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Abstract
The invention relates to the application technology of radio-frequency IC MFRC522 to an intelligent instrument, which belongs to the field of electronic industry. The application technology of the radio-frequency IC MFRC522 to the intelligent instrument can prolong the service life of the intelligent instrument. The system of the invention transfers data through the resonance generated by an antenna connected with the MFRC522 and an IC (Integrated Circuit) card coil and modulates and sends data in a buffering region through the setting of a register to obtain sending signals, the signals are sent in a form of driving the antenna by lead pins TX1 and TX2 to generate electromagnetic waves, and an IC card adopts the load modulation of the RF (Radio Frequency) field to carry out response. Meanwhile, after the antenna detects the response signals of the IC card, the response signals are transmitted to RX lead pins through the antenna matching, an MFRC522 internal receiving buffering device detects and demodulates the signals, carries out corresponding processing according to the arrangement of a register, and sends the data to a singlechip.
Description
Technical field:
The invention belongs to the electron trade field, is the application technology of a kind of radio frequency IC MFRC522 in intelligence instrument.
Background technology:
Because external conditions such as environment temperature, humidity, greasy dirt are to obvious such as the influence of contact card tables such as prepay water meter, prepayment diaphragm gas meter, Prepayment Heat Meter, deck wearing and tearing, corrosion, and moisture, dust etc. shortened the serviceable life to the card table greatly, so the non-contact card table has become current development trend.
Summary of the invention:
The present invention is exactly at the problems referred to above, and a kind of application technology of radio frequency ICMFRC522 in intelligence instrument that can improve the intelligence instrument mission life-span is provided.
For achieving the above object, the present invention adopts following technical scheme, and system of the present invention comes Data transmission by antenna and the IC-card coil generation resonance that is connected with MFRC522, thereby finishes the communication between module and card.MFRC522 modulates according to being provided with of register and sends buffer data and then obtain sending signal, and the form that generates electromagnetic waves with TX1, TX2 pin driven antenna sends, and IC-card adopts the load-modulate of RF field to respond.Simultaneously antenna detection is sent to the RX pin through antenna matching after the response signal of IC-card, the inner reception buffer of MFRC522 to its signal detect, demodulation, and carry out respective handling according to the setting of register, again its data are sent to single-chip microcomputer.
Beneficial effect of the present invention:
(1) highly integrated modulation-demodulation circuit adopts the small number of external device, out drive stage can be connected to antenna.
(2) support ISO/IEC 14443 TypeA interfaces and MIFARE communication protocol.
(3) support the SPI interface of multiple host interface: 10Mbit/s; I2C interface, the speed of quick mode are 400Kbit/s, and the speed of fast mode is 3400Kbit/s; Serial UART, transfer rate can be up to 1228.8Kbit/s, and frame depends on the RS232 interface.
(4) distinctive transmitter power down mechanism can be closed the inside antenna driver, promptly closes the RF field, reaches low-power consumption.
(5) built-in temperature sensor stops the RF emission automatically when overheated.
(6) the phase mutual interference is avoided in independently multi-group power power supply, optimizes EMC characteristic and signal decoupling performance.
Description of drawings:
Fig. 1 is a hardware elementary diagram of the present invention.
Embodiment:
System of the present invention comes Data transmission by antenna and the IC-card coil generation resonance that is connected with MFRC522, thereby finishes the communication between module and card.MFRC522 modulates according to being provided with of register and sends buffer data and then obtain sending signal, and the form that generates electromagnetic waves with TX1, TX2 pin driven antenna sends, and IC-card adopts the load-modulate of RF field to respond.Simultaneously antenna detection is sent to the RX pin through antenna matching after the response signal of IC-card, the inner reception buffer of MFRC522 to its signal detect, demodulation, and carry out respective handling according to the setting of register, again its data are sent to single-chip microcomputer.
The response signal of inner receiving circuit utilization card all has this function of modulation and carries out work on the double-side band of subcarrier.Recommend to use of the biasing of the inner VMID signal that produces of MFRC522 as RX pin input signal.In order to stablize VMID output, need between VMID and GND, to connect a capacitor C 4.Receiving circuit needs to connect a bleeder circuit between RX and VMID.Its match circuit and signal receiving circuit include EMC low-pass filter, receiving circuit, antenna-matching circuit and antenna as shown in Figure 3 among Fig. 3.Wherein element size can be with reference to the related data data in EMC low-pass filter, the receiving circuit, generally need not to adjust, but notice that components accuracy and material must adhere to specification, such as: L01, L02 should select the filter inductance of 1.0 μ H ± 10% for use, and C01, C02 should select the electric capacity of NP0 material ± 2% for use.
Embodiment 1: the non-contact IC card antenna utilizes inductive coupling to produce magnetic flux.Magnetic flux is used for providing power supply to the IC-card device, but and between transmission data.Therefore require the electric current maximum of aerial coil, produce maximum flux; Power match, use the utilisable energy of magnetic flux to greatest extent: enough bandwidth are to transmit the carrier signal of data-modulated undistortedly.
The actual inductance and capacitance depend on factors such as distance between antenna resistance (PCB type), conductor thickness, line and the line, protective layer material, near metal or ferrite.After Antenna Design is finished, be standard, adjust matching capacitance with the maximum distance of accurately communication.Matching capacitance also should adopt the NP0 material.
Claims (2)
1. the application technology of a radio frequency IC MFRC522 in intelligence instrument, it is characterized in that system of the present invention comes Data transmission by antenna and the IC-card coil generation resonance that is connected with MFRC522, with TX1, the form that TX2 pin driven antenna generates electromagnetic waves sends, IC-card adopts the load-modulate of RF field to respond, antenna detection is after the response signal of IC-card simultaneously, be sent to the RX pin through antenna matching, the inner reception buffer of MFRC522 detects its signal, demodulation, and carry out respective handling according to the setting of register, again its data are sent to single-chip microcomputer.
2. the application technology of a kind of radio frequency IC MFRC522 according to claim 1 in intelligence instrument, when it is characterized in that soft power down, the power consumption of MFRC522 is 10 μ A, hard power down, the power consumption of MFRC522 is 5 μ A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100134109A CN101996448A (en) | 2009-08-26 | 2009-08-26 | Application technology of radio-frequency IC MFRC522 to intelligent instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100134109A CN101996448A (en) | 2009-08-26 | 2009-08-26 | Application technology of radio-frequency IC MFRC522 to intelligent instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101996448A true CN101996448A (en) | 2011-03-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100134109A Pending CN101996448A (en) | 2009-08-26 | 2009-08-26 | Application technology of radio-frequency IC MFRC522 to intelligent instrument |
Country Status (1)
| Country | Link |
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| CN (1) | CN101996448A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103716063A (en) * | 2012-10-09 | 2014-04-09 | 林卓毅 | Communication apparatus capable of antenna switching |
| CN104376289A (en) * | 2014-12-08 | 2015-02-25 | 西安仓实电子科技有限公司 | Low-power-consumption-mode real-time contactless IC (integrated circuit) card monitoring and identifying method |
| US9380640B2 (en) | 2012-09-04 | 2016-06-28 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Communication apparatus equipped with switchable antenna |
-
2009
- 2009-08-26 CN CN2009100134109A patent/CN101996448A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9380640B2 (en) | 2012-09-04 | 2016-06-28 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Communication apparatus equipped with switchable antenna |
| CN103716063A (en) * | 2012-10-09 | 2014-04-09 | 林卓毅 | Communication apparatus capable of antenna switching |
| CN104376289A (en) * | 2014-12-08 | 2015-02-25 | 西安仓实电子科技有限公司 | Low-power-consumption-mode real-time contactless IC (integrated circuit) card monitoring and identifying method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110330 |