NFC Field Communication (Near Field CommunicaTIon) is a short-range, high-frequency wireless communication technology that allows non-contact point-to-point data transmission (within ten centimeters) to exchange data between electronic devices. This technology evolved from radio frequency identification (RFID) technology and is backward compatible with RFID. By using NFC technology in smart TV applications, it is easy to quickly pair and share content with devices such as smartphones and TV sets. It is also possible to easily pair NFC-enabled remotes with NFC TVs, which can be activated in seconds and start streaming content to a large screen or home theater. In fact, NFC technology is also used in Bluetooth pairing, mobile payment, direct information interaction and preservation applications.
1 NFC smart TV system structure and overall designThis design uses TI's TRF7970A transceiver IC as the TV terminal, RF430CL330H NFCTag is applied to the remote control terminal; in this system, its basic functions are as follows:
The TRF7970A can communicate with the RF430CL330H to achieve pairing between the TV and the remote control, which is the current pairing before 2.4GHz data transmission;
The TRF7970A can quickly pair WiFi with NFC smartphones;
The RF430CL330H can communicate with the smartphone to convert the data information of the mobile phone to the remote control or the TV;
Software upgrade to Firmware via NFC's air interface;
TRF7970A can read and write the label to realize the function selection of the TV;
The TRF7970A satisfies NFC's three functional communication methods: Reader/Write, Pear to Pear and Card Emulaiton, which fully meets the ISO/IEC18092, ISO/IEC21481 NFC standard; it can fully interact with the NFC-compliant device. RF430CL330H is A dynamic NFC Tag chip that conforms to the NFC Type 4 standard and supports data rates up to 848Kbps. The SPI interface can communicate effectively with the MCU.
2 hardware circuit design 2.1 TRF7970A module hardware circuit designThe TRF7970A is a 13.56MHz RFID highly integrated RF front-end chip that fully supports the NFC protocol standard. By configuring the ISO Control register of the chip, it can be set to work in different modes. The TRF7970A supports both SPI and parallel port communication. Interface mode, wide voltage (2.7V~5.5V) power supply, integrated LDO, support 5 power management modes, output power up to 200mW with 5V power supply. The receiving circuit has two paths (RX1 and RX2) with phase difference of 90 degrees to ensure the stability and reliability of the receiving. The basic hardware circuit is shown in the figure below:
The RF front end is matched to a 50 ohm RF impedance. The basic matching network is as follows:
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