General Description
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.

FEATUREs
• ISO 14443A compliant to Level-4
• 1kbit EEPROM (108 bytes of user memory)
• Configurable wake-up interrupt (after tag is selected or
   using proprietary command)
• Powered from external magnetic field with the possibility to
   draw up to 5mA
• User configurable regulated voltage extracted from external
   magnetic field
• Bit rates from 106 kbit/s till 848 kbit/s
• 7 byte UID
• Integrated resonant capacitor
• Integrated buffer capacitor
• 4-wire Serial Peripheral Interface (SPI) with 32 byte FIFO
• Wide SPI power supply range (1.65V to 3.6V)
• Wide temperature range: -40ºC to 85ºC
• Available as WLCSP 10-bumps, 10-pin MLPD (3mmx3mm)
   and tested sawn wafers

APPLICATIONs
The device is ideal for applications like
• 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