NFC-to-SPI/I²C NFC dynamic tag IC is NFC Forum-compliant

June 01, 2015 // By Graham Prophet
The AS3955 NFC Dynamic Tag IC adds 13.56 MHz NFC functionality to electronic devices, for example to pair them with NFC phones and transfer data. 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 assisted by the availability of SPI and I²C interfaces and by optimised protocols (tunnelling mode and extended mode), allowing bidirectional communication between the device microcontroller and an external NFC compliant device or ISO14443A reader device. AS3955 is able to operate fully powered by the RF field, without any external supply: or from an external 1.65 to 5.5V supply. This, combined with an advanced energy harvesting feature, greatly increases battery life time or even allows battery-less designs.

The IC is fully compliant as an NFC Forum Type 2/4 Tag, ISO14443A up to Level 4, EMVCo: energy harvesting supports up to 5 mA at 4.5V. The chip provides standalone NFC passive tag, functionality, with high-endurance EEPROM memory that reaches automotive grade quality.