Non contact point-to-point data transmission (within ten centimeters) between electronic devices for data exchange. This technology evolved from contactless radio frequency identification (RFID) and is backward compatible with RFID, mainly used for providing M2M (Machine to Machine) communication in handheld devices such as mobile phones. Due to the natural security of near-field communication, NFC technology is considered to have great application prospects in fields such as mobile payments. In recent years, due to the rapid growth in the functionality and popularity of mobile phones, early electronic wallets have had opportunities for promotion. The evolution of NFC is derived from the specific frequency band of RFID. Due to 3ASC25H204 DAPU100 the market application of mobile phones, NFC can obtain standard interfaces and platforms at a faster time. This article will briefly discuss the architecture and specifications of NFC.

Planned speed can reach 868 kbps
Excluding 13.56MHz at 721 kbps and 115kbps IRFM, with an operating distance of approximately 10cm; The specification for NFC is based on the RFID 13.56MHz frequency band, which was previously used including PhilipsMiFARE (ISO1443A), ISO1443B, ISO15693, ISO18000-3, and SonyFelica. Due to the emphasis on security mechanisms in the application of contactless cards in personal data recognition or electronic payment systems, and the integration of near-field communication that is close to the card reader system and the 13.56MHz short-range system, the last systems seen in the market are PhilipsMiFARE (ISO1443A) and SonyFelica. In the early days, these two systems were not compatible with each other, and it was not until recent years that the two specifications were merged and the NFC specification ECMA340/ISO18092 (NFCIP1, NFCinterface and protocol 1) was developed. This specification is compatible with existing PhilipsMiFARE (ISO1443A) and SonyFelica.

The power supply generates an RFfield, while in passive mode, the initiating device’s own power supply generates an RFfield; The target device uses a full wave rectification circuit to convert the energy of the RFfield at the initiating end into DC to supply its own power. It is worth mentioning that in passive mode, in order to meet the requirements of power saving, load regulation is adopted, which can achieve the effect of power saving.

 

 

The antenna architecture, of course, EMCA also specifies all dimensions in detail, and the value measured by the coil is 0.32V (RMS)=1A/m (magnetic field strength).

 

 

Device: 3ASC25H204 DAPU100Figure 7 shows two types of testing standard circuits and a set of antenna coils. This reference device is used to test the standard components of DUT. It also includes two sets of testing circuits, Figure 7-2 shows the modulation testing circuit, and Figure 7-3 shows the power testing circuit.

Power test: This test item tests whether the magnetic field strength supplied by the initiating device provides sufficient working power to the target object. Adjust the transmission of the signal from the generatingantenna and measure the intensity of Hmax (7.5A/m) on the calibration coil at the right end. At this time, adjust the reference device in conjunction with the power test circuit to adjust C2 so that the resonance point of the circuit is at 19MHz (this part is not detailed in the specifications why it is adjusted to 19MHz. Therefore, it can be inferred that if the output of 3V can be achieved at 19MHz, the voltage of the target object will definitely exceed 3V when it is 13.56MHz, so its lower limit value should be taken). Place it at the DUT position and adjust the circuit R2 to obtain a voltage value of 3V from C3. At this point, the Referencedevice has been completed, and then this card can be used to measure the initiating device. Place this card within the marked overload range of the initiating device, and the voltage value (C3) measured at any position within this overload range cannot exceed 3V. As for the Hmin test, it is roughly the same as the max test, except that the reference device resonance frequency is adjusted to 13.56MHz and the measured voltage value must both exceed 3V.

 

The battery’s endurance. Active NFC devices can provide all the power required for communication with passive devices through the internally generated RF field, similar to contactless smart cards, with the same power, ensuring that data can still be read normally even when the power of the mobile device is turned off.

4. Standardization

NFC is an open platform technology that complies with ECMA 340, ETSI TS 102 190 V1.1.1, and ISO/IEC 18092 standards. These standards specify the modulation scheme, encoding, transmission speed, and RF interface frame format of NFC devices, as well as the initialization settings and conditions required for data collision control during passive and active NFC mode initialization. In addition, these standards also define transmission protocols, including communication protocol initiation and data exchange methods.

5. Policy issues

Due to the complexity of the mobile payment industry, the construction of the value chain requires the participation of multiple parties. During this period, the industry leaders are unclear, financial institutions and mobile operators have comparable bargaining power, and the actual investment in the industry is relatively low. However, due to the lack of terminals and consumer environments, the user experience is poor, and the items and services purchased by users through mobile payments are not abundant, which currently does not bring true convenience to consumers.

Common certification requirements for NFC systems:

At present, the main certifications for NFC 3ASC25H204 DAPU100 terminals include CE, FCC, and NFC logo certification. Currently, NFC logo certification is still a voluntary certification, and the main testing requirement at this stage is still the Internet of Things (IoT) requirements for NFC devices. The CE standards for NFC devices are ETSI EN 300 330-1 and ETSI EN 300 330-2. The FCC certification standard for NFC devices is FCC Part 15C. Specific testing requirements can be found in the MORLAB special article titled “RF Testing Requirements for NFC Frequency Bands in CE and FCC Certification”