AS3955

General Description AS3955 NFC Forum Compliant Dynamic Tag AS3955 NFC Dynamic Tag IC is the ultimate solution to easily add NFC functionality to electronic devices. Thanks to a high sensitivity ISO14443A frontend and high integrated resonance capacitor, AS3955 offers standalone NFC passive tag functionality in a small footprint. Fast system integration and high speed data transfer are guaranteed by the available SPI and I²C interfaces and by the optimized protocols (Tunneling Mode and Extended Mode), allowing bidirectional communication between the device microcontroller and an external NFC compliant device or ISO14443A reader device (PCD). AS3955 is able to operate fully powered by the RF field, without any external supply. This, combined with an advanced energy harvesting feature, greatly increases battery life time or even allows battery-less designs. AS3955 is used with an appropriate antenna coil connected to the terminals LC1 and LC2, and behaves as a standard passive ISO 14443A tag (PICC). After the anti-collision protocol stage, based on configuration, AS3955 can operate as a standalone NFC Forum Type 2 Tag or, when tunneling mode is activated, as a bridge between the PCD and the microcontroller, e.g. to emulate a custom or standard ISO14443A Level 3 or Level 4 PICC or a NFC Forum tag. A configurable wake-up signal notifies the microcontroller on ongoing RF activities, in order to minimize overall power consumption. AS3955 includes an embedded EEPROM memory that can ...