AS3953 Factsheet

The Missing Link
www.ams.com/AS3953
AS3953 – Connects NFC With Everything Else
- NFiC: NFC interface IC
- Low Cost Bidirectional NFC interface
- Passive programming and wakeup
- Delivers 4mA from magnetic field
- Data rates up to 848 kbit/s
We provide innovative
analog solutions to
the most challenging
applications in sensor
and sensor interfaces,
power management, and
wireless.
General Description
The AS3953 delivers low cost, ultra low power NFC forum functionality to multiple
different applications.
The AS3953 is a analog front-end with integrated 14443A data framing and SPI
interface. It is designed to create a fast data link between an ISO14443A reader device
(PCD) and a microcontroller. The AS3953 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 AS3953 perfect for wireless communication to a low power
battery powered device. The AS3953 is used with an appropriate antenna coil connected to the terminals LC1 and LC2 and behaves as a normal passive ISO144443A tag
(PICC). After the anti-collision protocol is passed, the PCD sends a Wake-up command,
which wakes up the microcontroller by sending an interrupt. From this point onwards,
the AS3953 serves as a data link between the microcontroller and the PCD.
The AS3953 includes an onboard EEPROM that can be accessed either from the PCD or
from the microcontroller via the SPI interface. This built-in flexibility makes it ideal for
two types of applications:
- Where personalization data is programmed by the PCD (even in case the SPI side is
not powered) and it is later read by microcontroller through SPI interface.
- Where log data is stored periodically by the microcontroller and can then be read by
the PCD even when the microcontroller is not powered.
A regulated power supply voltage extracted from the PCD field is also available on a
pin and can be used as power supply for external circuitry. For example, an external
microcontroller and a sensor could be powered from the PCD field combined with
pass through data rates up to 848 Kbps, which means the AS3953 is also ideal for
contactless passive programming of MCU systems. The AS3953 can also operate as a
stand-alone ISO14443A tag. The AS3953 supports ISO14443A up to Level 4, meaning
a contactless smart card or an NFC forum compatible tag (Tag Type 4) can be built.
Having a NFC Forum compatible tag interface allows the AS3953 to be used in an
application where a standard NFC enabled phone is used as a PCD.
Applications
Features
- Smart cards with displays
- Sensors and dataloggers
- Industrial, Medical and Factory Automation
- Diagnostics and Maintainance
- Product activation and passive programming
- NFC Bluetooth Pairing
- Consumer electronics
- ISO 14443A compliant to level 4
- 1k bit EEPROM (928 bits of user memory)
- Configurable wake-up interrupt
(after tag is selected or using proprietary command)
- Powered from external magnetic field with the possiblity to draw up to 4mA
- 7 byte UID
- User configurable regulated voltage extracted from external magnetic field
- Very High Data Rates available from 106kbit/s to 848 kbit/s
- 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 die or in MLP - Dual x 10 3x3 package
AS3953 Block Diagram
VP_REG
VP_INT
VP_SPI
POWER
MANAGER
VDD
LC1
AFE
LC2
LEVEL
SHIFTERS
LOGIC
POR
/IRQ
SPI
EEPROM
VSS
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© 06/2012 by ams
Subject to change without notice
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