AS3910 Datasheet, PDF (1/47 Pages) ams AG – 13.56 MHz RFID Reader IC, ISO-14443 A/B

Data Sheet
AS3910
13.56 MHz RFID Reader IC, ISO-14443 A/B
1 General Description
The AS3910 is a high performance 13.56MHz HF RFID Reader IC.
With austriamicrosystems’ unique antenna management technology
it is optimized for applications with directly driven antennas.
The AS3910 is unequalled in the domain of HF Reader ICs in that it
contains two differential low impedance (1.5Ω) antenna drivers.
These drivers are unmatched meaning the IC can deliver up to 8
times the output power of a standard HF Reader IC using the same
power supply voltage.
Additionally using this configuration means half of the power
consumption at the same output power.
The IC has an operating voltage down to 2.4V and a low power
operating mode of 5mA. This means the AS3910 is ideal for portable
or battery powered applications.
For applications where high power is required (EMV) the AS3910
can attain up to 1W. This means there is no need for complex
external booster circuitry.
The component count and complexity of the design is further
reduced through the patented automatic modulation depth
adjustment.
The analog front end (AFE) is complimented by a highly integrated
data framing engine for both ISO-14443 A and B.
This includes data rates up to 848kbits with all framing and
synchronization tasks on board. This enables the customer to build a
complete HF RFID Reader using only a low end micro.
The AS3910 not only supports reader to tag communication, but
sports Peer to Peer communication using the NFCIP-1 active
communication mode with a data rate of 106kbps.
The IC has a SPI, which enables bi-directional communication with
the external microcontroller.
Other standard and custom protocols, such as ISO-15693 can be
implemented via transparent mode.
2 Key Features
Close loop adjustment of ASK modulation for accurate control
of modulation depth in case of ISO-14443B protocol
Antenna trimming system providing correction range of LC
Low power operating mode reduces receiver consumption from
10mA to 5mA
Low power (3.5µA) NFC target mode
Integrated regulators to boost system PSRR
AM/PM demodulator to eliminate communication holes
RSSI measurement
Accurate RF envelope measurement (8 bit A/D)
High output power at 3.3V power supply:
- up to 1W in case regulator is externally shorted
- up to 500mW in case differential output and antenna trimming
is used
- up to 125mW in case of single ended output and antenna
trimming is used
Squelch feature which performs gain reduction to compensate
for noise generated by transponder processing
User selectable and automatic gain control
Transparent mode to implement other standard and custom
protocols (ISO-15693, Felica, ….)
Quartz oscillator capable of operating with 13.56MHz or
27.12MHz crystal with fast start-up
Additional A/D converter input, Serial peripheral interface (SPI)
with 32 byte FIFO
Supply voltage range from 2.4V to 3.6V
Wide temperature range: -40ºC to 85ºC
QFN 32 5x5 package
3 Applications
The AS3910 is ideal for applications where the reader antenna is
directly driven (no 50Ω cable). It also includes several unique
features, which make it especially suitable for low power and battery
powered applications.
www.austriamicrosystems.com/HF_RFID_Reader/AS3910
Revision 2.3
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