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AS3953B Datasheet

14443 High Speed Passive Tag Interface

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General Description
ams Datasheet
[v1-04] 2016-Jan-07
AS3953B
14443 High Speed Passive Tag
Interface
The AS3953B NFC interface IC (NFiC) delivers low cost, ultra low
power NFC forum functionality to multiple different
applications. The AS3953B 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 AS3953B 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 AS3953B
perfect for wireless communication to a low-power battery
powered device.
The AS3953B is used with an appropriate antenna coil
connected to the terminals LC1 and LC2, and behaves as a
normal passive ISO 144443A 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 AS3953B serves as a data link between the
microcontroller and the PCD. AS3953B can also operate as
NFCIP-1 target at 106kbit/s.
The AS3953B 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 848kbit/s, which means the
AS3953B is ideal for contactless passive programming of MCU
systems. The AS3953B can also operate as a stand-alone ISO
14443A tag.
The AS3953B supports ISO 14443A 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 AS3953B to be used in an application where
a standard NFC enabled phone is used as a PCD.
Ordering Information and Content Guide appear at end of
datasheet.
Page 1
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AS3953B Datasheet

14443 High Speed Passive Tag Interface

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AS3953B − GeneralDescription
Figure 1:
Added Value of Using AS3953B
Key Benefits & Features
The benefits and features of AS3953B,14443 High Speed Passive
Tag Interface are listed below:
Benefits
Features
NFC Forum compliance for full
interoperability
ISO 14443A compliant to Level-4
Data rate transmission up to the
maximum allowed by ISO 14443A
compliance
Bit rates from 106 kbit/s till 848 kbit/s
7 byte UID
ECMA-340 / ISO/IEC_18092 compliance NFCIP-1 target at 106 kbit/s
Internal user memory for standalone
application
1k bit EEPROM (108 bytes of user memory)
Allows zero-power standby
Configurable wake-up interrupt (after tag is selected or
using proprietary command)
Enables long battery life time, or
battery-less designs
Powered from external magnetic field with the possibility to
draw up to 5mA
Allows supply of external circuitry
User configurable regulated voltage extracted from external
magnetic field
Easy and fast antenna design and
impedance matching
Integrated resonant capacitor
Guarantees no reset during reader (PCD)
modulation
Integrated buffer capacitor
Design flexibility, easy integration.
Fits requirements for various embedded
applications and manage of external
microcontroller
4-wire Serial Peripheral Interface (SPI) with 32 byte FIFO
Fits supply requirements for various
applications, including industrial
Wide SPI power supply range (1.65V to 3.6V)
Flexibility for wide range of applications Wide temperature range: -40ºC to 85ºC
Small outline, compatibility to common
inlay and card manufacturing lines,
surface-mount assembly
Available as sorted wafer and Thin Wafer Level Chip Scale
Package
Page 2
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ams Datasheet
[v1-04] 2016-Jan-07


Part Number AS3953B
Description 14443 High Speed Passive Tag Interface
Maker ams
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