AS3953-DK-ST Datasheet, PDF(1/42 Page) List of Unclassifed Manufacturers

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AS3953-DK-ST Datasheet, PDF (1/42 Pages) List of Unclassifed Manufacturers – 14443 High Speed Passive Tag Interface

AS3953

14443 High Speed Passive Tag Interface

1 General Description

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.

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.

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:

ï®ï 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.

ï®ï 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.

The AS3953 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 AS3953 to be used in an application where a standard NFC

enabled phone is used as a PCD.

2 Key Features

ï®ï ISO 14443A compliant to Level-4

ï®ï NFCIP-1 target at 106 kb/s

ï®ï 1k bit EEPROM (928 bits of user memory)

ï®ï Configurable wake-up interrupt (after tag is selected or using

proprietary command)

ï®ï Powered from external magnetic field with the possibility to

draw up to 5mA

ï®ï 7 byte UID

ï®ï User configurable regulated voltage extracted from external

magnetic field

ï®ï Bit rates from 106 Kbps till 848 Kbps

ï®ï Integrated resonant capacitor

ï®ï Integrated buffer capacitor

ï®ï 4-wire Serial Peripheral Interface (SPI) with 32 byte FIFO

ï®ï Wide SPI power supply range (1.65V to 3.6V)

ï®ï Wide temperature range: -40ÂºC to 85ÂºC

ï®ï 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

VP_INT

Power

Manager

VDD

AS3953

VP_SPI

LC1

AFE

LC2

IRQ

POR

Logic

EEPROM

Level

Shifters

SPI

VSS

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