ams AG - global leader in the design and manufacture of high performance analog ICs (integrated circuits)

AS3955 NFC Sensor Interface Tag IC

NFC to SPI/I²C Interface Tag IC

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AS3955 NFC Dynamic Tag IC is the ultimate solution to easily add NFC functionality to electronic devices, 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 guaranteed by the available SPI and I²C interfaces and by optimized protocols (Tunneling 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. This, combined with an advanced energy harvesting feature, greatly increases battery life time or even allows battery-less designs.

Key Features

  • High sensitivity ISO14443A frontend
  • Tunneling and Extended Modes for high speed bidirectional data transfer
  • Fully compliant to NFC Forum Type 2/4 Tag, ISO14443A up to Level 4, EMVCo
  • Energy harvesting up to 5mA@4.5V

Key Benefits

  • Standalone NFC passive tag functionality
  • High endurance EEPROM memory reaches automotive grade quality
  • Allows battery-less designs
  • Fast system integration and high speed data transfer

Product Facts

Frequency [MHz] 13.56
Protocol [ ] NFC Forum compliance
ISO 14443A compliance up to Level 4
Supply voltage [ V] RF field or ext. 1.65 to 5.5
Temperature range [°C] -40 to +125
Interface ISO14443A
SPI slave interface up to 5 Mbps
I²C slave interface up to 1 Mbps
EEPROM [kbits] 2 or 4
Features [ ] Type 2 Tag
Type 4 Tag emulation
Passive wake-up interrupt
32-bit password memory protection
Silent mode
Stealth mode
Energy harvesting 5mA @ 4.5V
Data rate [ kbps] up to 106
Package [ ] Die, MLPD-10, WL-CSP

Additional Information


Segment and applications:

  • Consumer Electronics: Bluetooth, BLE and Wi-Fi pairing in consumer electronics
  • Home appliance: Configuration update over NFC
  • Retail: Interactive marketing
  • Enterprise: Access control and personal identification
  • Gaming: Interactive gaming
  • Automotive: smart keys
  • Health care: retrieve and update data over NFC
  • Maintenance: Log access and configuration update
  • Production: Power-off configuration