AS3953
14443 High Speed Passive Tag Interface
The AS3953 supports ISO 14443A up to Level-4, meaning a
1 General Description
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.
The AS3953 NFC interface IC (NFiC) 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
ISO 14443A 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.
2 Key Features
ISO 14443A compliant to Level-4
NFCIP-1 target at 106 kb/s
1k bit EEPROM (928 bits of user memory)
The AS3953 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
AS3953 serves as a data link between the microcontroller and the
PCD. AS3953 can also operate as NFCIP-1 target at 106 kb/s.
Configurable wake-up interrupt (after tag is selected or using
proprietary command)
Powered from external magnetic field with the possibility to
draw up to 5mA
7 byte UID
User configurable regulated voltage extracted from external
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:
magnetic field
Bit rates from 106 Kbps till 848 Kbps
Integrated resonant capacitor
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.
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
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 848Kbps, which means the AS3953 is ideal for
contactless passive programming of MCU systems. The AS3953 can
also operate as a stand-alone ISO 14443A tag.
Available as WLCSP 10-bumps (Future delivery options: 10-pin
MLPD (3x3mm) and Gold bumped dies)
3 Applications
The device is ideal for applications like Passive wake-up,
Multipurpose HF interface to a controller, Low power or passive
programming, Ultra Low Power Data Logger, RFID Programmable
configuration EEPROM, ISO 14443A smart card, NFC Forum Tag
Type 4, and Bluetooth and Wi-Fi pairing.
Figure 1. AS3953 Block Diagram
VP_REG
AS3953
VP_INT
Power
Manager
VP_SPI
VDD
LC1
LC2
IRQ
SPI
Level
Shifters
AFE
Logic
EEPROM
POR
VSS
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