AS3955 Datasheet, PDF (1/111 Pages) ams AG – NFC Forum Compliant Dynamic Tag

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 be
accessed from the PCD through the RF link or from the
microcontroller through the SPI or I²C interfaces. Part or all
memory can be protected by a 32-bit password, or permanently
locked.
AS3955 supports ISO 14443A up to Level 4 and is designed
according to EMVCo requirements, to enable the emulation of
contactless smart cards or NFC Forum compliant Type 2 or Type
4 Tags.
AS3955 is designed for high reliability, and can operate in a wide
power supply range from 1.65V to 5.5V, in a wide temperature
range from -40 °C to 125 °C. EEPROM memory reaches
automotive grade quality with endurance of 100,000 cycles and
data retention of 10 years at 125 °C.
Ordering Information and Content Guide appear at end of
datasheet.
ams Datasheet
[v1-01] 2015-Apr-29
Page 1
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