21ic News is committed to the leading electronic component distributor in the Asia-Pacific market. The United Nations Group announced that its Pinjia Group has launched NXP's new NFC chips PN544 and PN65O, as well as its latest e-wallet solutions.
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Compliant with the latest NFC specifications developed by the European Telecommunications Standards Institute (ETSI), the PN544 provides mobile phone manufacturers and telecom operators with a fully compatible platform for the next generation of NFC devices and services: the PN544 is fully compatible with all available single-line Protocol (SWP) Connects to the NFC specification of the SIM card and Host Controller Interface (HCI); the PN65O is the PN544 plus NXP's SmartMX security module, and the PN544 and PN65O hardware PINs are fully PIN-compatible. At the same time, the PN65O / PN544 also offers a variety of host interface options to ensure that handset manufacturers can easily integrate High Speed ​​UART, SPI, I2C, and support a variety of RF interface protocols: ISO14443A/B, ISO15693, MIFARE, Felica. In addition, NXP works closely with leading SIM card manufacturers such as Gemalto, Oberthur Technologies and Giesecke & Devrient to ensure interoperability of SWP interfaces including MIFARE technology.
Advantages under PN544 and PN65O:
‧ Small size for easy size optimization
‧ Low power consumption
‧ Battery off and low battery mode
‧ Optional platform-independent software stack
‧ Provide GPIO PORT for external unit control
‧ Interrupting IRQ makes command communication of external control unit easier
‧ Support security unit control interface
‧ Integrated power control unit
NXP's latest NFC e-wallet solution:
The NFC e-wallet function is based on the mobile phone as a trading platform. The PN544 NFC controller (the PN65O has a built-in security module) and the security module implement mobile payment and data exchange functions.
RF section:
The NFC RF circuit is composed of EMC filter circuit, matching circuit, receiving circuit and antenna.
EMC circuit: Since the system is based on an operating frequency of 13.56 MHz. This frequency is generated by a quartz crystal. At the same time, high-order harmonics are generated. In order to comply with the internal electromagnetic compatibility rules, higher-order harmonics of three, five, and five times of 13.56 MHz must be appropriately suppressed. Therefore, the EMC circuit is configured as an LC low-pass filter for filtering out higher harmonics.
Antenna matching circuit: Since the antenna coil itself is a low-impedance device, in order to maximize the transmission of energy from the NFC IC to the antenna, a matching circuit must be added between the antenna and the NFC IC. Eliminate the energy loss caused by signal reflection caused by mismatch.
Receive circuit: consists of R127, C118, R128, C119. The Vmid potential generated inside the chip is used as the input potential of the RX pin. To reduce the disturbance, the capacitor should be used to ground Vmid. The bias voltage of Vmid can increase the voltage drive of the Rx pin.
NFC and SIM card security module interface circuit: NFC IC with SWP one-line interface can realize data communication with SIM card, its reference circuit is:
NFC English full name Near Field Communication, short-range wireless communication. It is a wireless technology initiated by NXP and jointly promoted by famous manufacturers such as Nokia and Sony. It combines inductive card reader, inductive card and peer-to-peer function on a single chip, which is compatible with short distances. The device performs identification and data exchange. NFC has the characteristics of two-way connection and identification, working in the frequency range of 13.56MHz, and the working distance is close to 10 cm. NFC technology promotes standardization under the ISO 18092, ECMA 340 and ETSI TS 102 190 frameworks, and is also compatible with the widely used ISO 14443 Type-A, B and Felica standard contactless smart cards.
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