AS3953B Datasheet | ams

General Description ams Datasheet [v1-04] 2016-Jan-07 14443 High Speed Passive Tag Interface The AS3953B NFC interface IC (NFi C) delivers low cost, ultra low power NFC forum functionality to multiple different applications. The AS3953B 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 AS3953B 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 AS3953B perfect for wireless munication to a low-power battery powered device. The AS3953B 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 mand, which wakes up the microcontroller by sending an interrupt. From this point onwards, the AS3953B serves as a data link between the microcontroller and the PCD. AS3953B can also operate as NFCIP-1 target at 106kbit/s. The AS3953B 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 bined with pass through data rates up to 848kbit/s, which means the AS3953B is ideal for contactless passive programming of MCU systems....