آر اف (فرکانس رادیویی) و بی‌سیم آی‌سی آر‌اف‌آی‌دی و کنترل دسترسی

Product Attributes

Introduction

The AS3953A NFC interface IC (NFiC) delivers low cost, ultra low power NFC Forum functionality to multiple different applications. The AS3953A is a analog front-end with integrated 14443A data framing and SPI interface. It is designed to create a fast data link between an ISO 14443A reader device (PCD) and a microcontroller. The AS3953A is passively powered meaning that it can be supplied from the PCD magnetic field, eliminating the need of a continual external supply. This makes the AS3953A perfect for wireless communication to a low-power battery powered device. The AS3953A is used with an appropriate antenna coil connected to the terminals LC1 and LC2, and behaves as a normal passive ISO 144443A tag (PICC). After the anti-collision protocol is passed, the PCD sends a Wake-Up command, which wakes up the microcontroller by sending an interrupt. From this point onwards, the AS3953A serves as a data link between the microcontroller and the PCD. AS3953A can also operate as NFCIP-1 target at 106 kbit/s. The AS3953A includes an onboard EEPROM that can be accessed either from the PCD or from the microcontroller via the SPI interface. This built-in flexibility makes it ideal for two types of applications: • Where personalization data is programmed by the PCD (even in case the SPI side is not powered) and it is later read by microcontroller through SPI interface. • Where log data is stored periodically by the microcontroller and can then be read by the PCD even when the microcontroller is not powered. A regulated power supply voltage extracted from the PCD field is also available on a pin and can be used as power supply for external circuitry. For example, an external microcontroller and a sensor could be powered from the PCD field combined with pass through data rates up to 848kbit/s, which means the AS3953A is ideal for contactless passive programming of MCU systems. The AS3953A can also operate as a stand-alone ISO 14443A tag. The AS3953A supports ISO 14443A up to Level-4, meaning a contactless smart card or an NFC forum compatible tag (Tag Type 4) can be built. Having a NFC Forum compatible tag interface allows the AS3953A to be used in an application where a standard NFC enabled phone is used as a PCD.

Applications

• Passive wake-up
• Multipurpose HF interface to a controller
• Low power or passive programming
• Ultra low power data logger
• RFID programmable configuration EEPROM
• ISO 14443A smart card
• NFC Forum Tag Type 4
• Bluetooth and Wi-Fi pairing